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Allen-Bradley MPL-B4530K-HJ74AA Servo Motor

1. Product Overview

The MPL-B4530K-HJ74AA is a 400 V class AC rotary servo motor from the MP-Series MPL Low-Inertia Brushless Servo Motor family.

This motor is designed for industrial motion-control applications that require high rotational speed, controlled acceleration and deceleration, repeatable positioning, and reliable closed-loop servo performance.

The MPL-B4530K-HJ74AA uses a 130 mm frame size, a 76.2 mm magnet stack, and a 4000 rpm maximum operating speed. It provides approximately 8.25 N·m of continuous stall torque, approximately 20.3 N·m of peak torque, and approximately 2.6 kW of rated continuous power.

The HJ74AA configuration combines a 2000-line incremental encoder, a keyed shaft extension, and an integrated 24 V DC holding brake.

This makes it different from the HJ72AA version, which uses the same general motor platform but does not include the integral brake.

The K-series motor configuration is particularly attractive when the machine requires a higher-speed servo motor. The 4000 rpm rating allows the motor to support faster rotary motion than the comparable 3000 rpm B4530F configuration.

The motor also uses a low-inertia rotor design. This characteristic is valuable in machinery that repeatedly accelerates, decelerates, indexes, reverses direction, or performs rapid positioning movements.

The overall configuration makes the MPL-B4530K-HJ74AA suitable for packaging equipment, automated assembly machinery, indexing systems, pick-and-place machines, material handling equipment, printing and converting machinery, and many other industrial motion applications.

The model is also a discontinued configuration, with an engineering replacement identified as MPL-B4530K-SJ74AA.

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2. Brand and Product Series

Item	Specification
Brand	Allen-Bradley
Product Family	MP-Series
Product Series	MPL Low-Inertia Brushless Servo Motors
Model	MPL-B4530K-HJ74AA
Product Type	AC Rotary Servo Motor
Voltage Class	400 V AC
Motor Voltage Reference	460 V AC
Rated Speed Class	4000 rpm
Continuous Rated Power	Approx. 2.6 kW
Continuous Stall Torque	Approx. 8.25 N·m
Peak Stall Torque	Approx. 20.3 N·m
Feedback	2000-line incremental encoder
Shaft	Keyed shaft extension
Brake	24 V DC integral holding brake
Frame Size	130 mm
Frame Size Equivalent	5.12 in.
Magnet Stack	76.2 mm
Magnet Stack Equivalent	3.0 in.
Mounting	IEC metric
Connector	SpeedTEC DIN
Connector Configuration	Right-angle
Connector Rotation	180°
Motor Design	Low inertia
Approx. Brake Motor Weight	9.1 kg class

The product configuration is specified as a 460 V-class MP-Series MPL motor with a 130 mm frame, 76.2 mm stack, 4000 rpm rating, 2000-line incremental encoder, keyed shaft, SpeedTEC DIN right-angle connector, and 24 V DC brake.

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3. Detailed Technical Parameters

Parameter	MPL-B4530K-HJ74AA Specification
Model	MPL-B4530K-HJ74AA
Brand	Allen-Bradley
Product Series	MP-Series MPL
Product Type	Low-Inertia AC Rotary Servo Motor
Voltage Class	400 V AC
Motor Voltage Reference	460 V AC
Rated Speed	4000 rpm
Maximum Motor Speed	4000 rpm
Continuous Rated Power	Approx. 2.6 kW
Continuous Stall Torque	Approx. 8.25 N·m
Peak Stall Torque	Approx. 20.3 N·m
Rotor Inertia	Approx. 0.00040 kg·m²
Feedback Type	Incremental encoder
Encoder Resolution	2000 lines/revolution
Shaft Configuration	Keyed shaft
Shaft Extension	Keyed
Shaft Seal	No
Integral Brake	Yes
Brake Voltage	24 V DC
Brake Type	Holding brake
Frame Size	130 mm
Frame Equivalent	5.12 in.
Magnet Stack Length	76.2 mm
Stack Equivalent	3.0 in.
Mounting Standard	IEC metric
Mounting Holes	Free mounting holes / Type FF
Connector	SpeedTEC DIN
Connector Orientation	Right-angle
Connector Rotation	180°
Motor Construction	Low inertia
Approx. Brake Motor Weight	9.1 kg
Approx. Weight in Pounds	20 lb
Typical Application	Industrial motion control

The B4530K motor family is rated at approximately 4000 rpm, 2.6 kW, 8.25 N·m continuous stall torque, and 20.3 N·m peak torque.

The exact HJ74AA configuration adds the 24 V DC brake, while retaining the keyed shaft and 2000-line incremental feedback arrangement.

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4. Dimensions and Mechanical Configuration

The MPL-B4530K-HJ74AA uses a 130 mm frame and 76.2 mm magnet stack.

These two dimensions are particularly important when evaluating whether the motor will fit into an existing machine design.

Mechanical Parameter	Specification
Frame Size	130 mm
Frame Size in Inches	5.12 in.
Magnet Stack	76.2 mm
Magnet Stack in Inches	3.0 in.
Shaft Type	Keyed
Shaft Key	Yes
Shaft Seal	No
Brake	Integrated 24 V DC brake
Mounting Standard	IEC metric
Mounting Type	Free mounting holes / Type FF
Connector	SpeedTEC DIN
Connector Style	Right-angle
Connector Rotation	180°
Approx. Brake Motor Weight	9.1 kg

The 130 mm frame represents the primary motor frame dimension, while the 76.2 mm stack identifies the active motor stack length.

The complete installed envelope should be taken from the mechanical drawing when designing a machine because the actual installation space also depends on the shaft extension, connector position, rear clearance, mounting flange, and brake assembly.

For product comparison and preliminary mechanical selection, however, the 130 mm frame and 76.2 mm stack provide the most useful basic dimensional references.

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5. Product Weight

The motor’s brake configuration adds mass compared with the corresponding no-brake version.

For the B4530 motor brake configuration, the brake-motor weight is approximately 9.1 kg, or approximately 20 lb.

Weight Parameter	Approximate Value
Brake Motor Weight	9.1 kg
Weight in Pounds	Approx. 20 lb
Motor Type	B4530K brake configuration
Brake	24 V DC

The weight should be considered when the motor is installed on a moving machine axis.

For example, in a linear actuator or gantry system, motor mass contributes to the total moving load. A heavier motor can increase the mechanical demand on the axis and may affect acceleration requirements.

The approximately 9.1 kg value is associated with the B4530 brake-motor configuration.

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6. Electrical Characteristics

The MPL-B4530K-HJ74AA belongs to the 400 V AC class and uses a 460 V motor voltage reference.

Its principal electrical and motion characteristics are shown below.

Electrical Parameter	Specification
Voltage Class	400 V AC
Motor Voltage Reference	460 V AC
Nominal Motor Current Reference	Approx. 7.8 A
Nominal Electrical Frequency	Approx. 200.7 Hz
Nominal Operating Speed	Approx. 3010 rpm
Rated Power	Approx. 2.6 kW
Motor Poles	8
Peak Current Reference	Approx. 19.1 A
Continuous Stall Torque	8.25 N·m
Maximum Motor Speed	4000 rpm

The motor data used for drive configuration identifies approximately 460 V, 7.8 A, 200.7 Hz, 3010 rpm nominal operating speed, 2.6 kW power, eight poles, 19.1 A peak current, 8.25 N·m continuous stall torque, and 4000 rpm maximum speed for the B4530K motor family.

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7. Torque Performance

The MPL-B4530K-HJ74AA provides approximately 8.25 N·m of continuous stall torque and approximately 20.3 N·m of peak torque.

Torque Parameter	Specification
Continuous Stall Torque	8.25 N·m
Peak Stall Torque	20.3 N·m
Continuous Power	Approx. 2.6 kW
Rated Speed Class	4000 rpm
Peak-to-Continuous Torque Ratio	Approx. 2.46 : 1

The continuous torque rating is important when determining whether the motor can handle the sustained mechanical load.

The peak torque value is more relevant to short-duration acceleration, deceleration, indexing, and transient load conditions.

A machine should not be sized only from the peak torque number. The complete duty cycle, acceleration profile, load inertia, friction, transmission efficiency, and required continuous torque should all be considered.

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8. 4000 rpm High-Speed Design

One of the most noticeable characteristics of the MPL-B4530K-HJ74AA is its 4000 rpm speed class.

This makes the motor particularly useful in machinery where the servo axis must move quickly.

Speed Parameter	Value
Nominal Operating Speed	Approx. 3010 rpm
Rated Speed Class	4000 rpm
Maximum Motor Speed	4000 rpm
Continuous Power	Approx. 2.6 kW

The higher speed rating can be useful in applications where the motor must complete repeated motion cycles in a limited amount of time.

For example, a machine may use the motor to accelerate rapidly, rotate at high speed for a short period, then decelerate and return to a precise position.

The 4000 rpm configuration can provide additional speed margin compared with the 3000 rpm B4530F family.

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9. Low-Inertia Rotor

The B4530K motor has a rotor inertia of approximately 0.00040 kg·m².

Low rotor inertia is one of the defining characteristics of the MPL servo motor family.

Characteristic	Advantage
Low Rotor Inertia	Rapid acceleration
Low Rotor Inertia	Rapid deceleration
Low Rotor Inertia	Faster response to speed commands
Low Rotor Inertia	Good for indexing
Low Rotor Inertia	Useful for repeated direction changes
Low Rotor Inertia	Supports high-cycle machine operation

A low-inertia motor is particularly valuable when the load itself is relatively manageable and the machine needs to change speed quickly.

Typical examples include packaging machines, indexing tables, pick-and-place systems, assembly machines, and automated transfer equipment.

The B4530K family is listed with approximately 0.00040 kg·m² rotor inertia.

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10. 2000-Line Incremental Encoder

The HJ74AA configuration uses a 2000-line incremental encoder.

Feedback Parameter	Specification
Feedback Type	Incremental encoder
Resolution	2000 lines/revolution
Feedback Function	Speed and position feedback
Control Type	Closed-loop servo control
Application	Motion control and positioning

The encoder supplies feedback to the servo control system so that motor speed and position can be controlled accurately.

The incremental feedback arrangement is a practical choice for many industrial machines.

It is especially appropriate when the control architecture already provides the necessary homing, reference, and machine-position management functions.

Compared with absolute feedback configurations, the incremental encoder arrangement can be simpler for applications that do not require absolute position information after power cycling.

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11. Keyed Shaft Extension

The MPL-B4530K-HJ74AA uses a keyed shaft extension.

Shaft Parameter	Specification
Shaft Configuration	Keyed
Shaft Extension	Keyed
Shaft Key	Yes
Shaft Seal	No
Coupling Interface	Keyed coupling compatible
Typical Use	Gears, pulleys, couplings, mechanical transmission

The keyed shaft provides a conventional mechanical interface that can be convenient for industrial machine builders.

A keyed shaft can be used with suitable keyed couplings, hubs, pulleys, and other mechanical transmission components.

When installing the motor, the coupling should be properly aligned and selected according to the motor’s torque, speed, shaft-load, and allowable mechanical-load requirements.

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12. Integrated 24 V DC Holding Brake

The HJ74AA suffix identifies a brake-equipped configuration.

The MPL-B4530K-HJ74AA includes an integrated 24 V DC holding brake.

Brake Parameter	Specification
Integral Brake	Yes
Brake Voltage	24 V DC
Brake Type	Holding brake
Primary Function	Mechanical holding
Typical Application	Vertical axes and positioning systems
Brake Configuration	Integrated into motor

The integrated brake is one of the most useful features of this model.

It can hold the motor shaft when servo torque is removed, making it useful for applications where the machine must remain stationary after motion stops.

Typical examples include vertical positioning mechanisms, lifting equipment, vertical slides, and other axes where gravity or external forces can cause the load to move.

The brake should be regarded primarily as a holding device rather than as the normal method for dynamically stopping a high-speed moving load.

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13. Brake Application

The brake can be particularly valuable in applications where the machine needs to maintain position during:

• Servo disable
• Emergency conditions
• Power-off conditions
• Maintenance operations
• Machine standby
• Vertical load holding

For vertical axes, the complete machine safety design should still consider the possibility of load movement and should not rely solely on the motor brake when additional mechanical safety measures are required.

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14. SpeedTEC DIN Connector

The motor uses a right-angle SpeedTEC DIN connector.

The connector can be rotated through approximately 180°.

Connector Parameter	Specification
Connector Type	SpeedTEC DIN
Connector Position	Right-angle
Rotational Adjustment	180°
Connection Style	Quick-connect
Main Benefit	Flexible cable routing

The right-angle connector is useful when the rear of the motor has limited clearance.

Instead of requiring the cable to extend directly backward, the right-angle arrangement can keep the cable closer to the machine structure.

The rotational capability also allows the installer to choose a more convenient cable direction.

This is particularly useful in compact packaging machines and multi-axis automated equipment where cables must pass around guards, frames, and moving components.

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15. IEC Metric Mounting

The MPL-B4530K-HJ74AA uses an IEC metric flange mounting configuration with free mounting holes.

Mounting Parameter	Specification
Mounting Standard	IEC metric
Mounting Type	Flange mount
Mounting Holes	Free mounting holes
Flange Style	Type FF
Frame Size	130 mm

The metric mounting arrangement is convenient for machine designs based on metric mechanical dimensions.

The mounting structure should be designed with adequate stiffness to prevent vibration and alignment problems.

Correct flange alignment is especially important for servo motors because mechanical misalignment can result in excessive bearing loads, coupling wear, vibration, and reduced servo performance.

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16. Product Introduction

The MPL-B4530K-HJ74AA is a high-speed industrial servo motor intended for automated machinery requiring controlled rotary motion.

Its main performance characteristics are built around a 4000 rpm speed class, 2.6 kW continuous power, and 8.25 N·m continuous stall torque.

The motor combines these performance characteristics with a low-inertia rotor, incremental encoder feedback, keyed shaft, and integrated 24 V DC brake.

This combination gives the motor a practical balance between speed, torque, feedback functionality, and mechanical integration.

The 130 mm frame makes the motor suitable for medium-sized industrial machine axes.

The 76.2 mm magnet stack provides a useful torque-producing motor length without moving into a substantially larger frame class.

The integrated brake adds an important mechanical function for applications where holding torque is required after servo power is removed.

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17. Main Product Advantages

17.1 4000 rpm High-Speed Capability

The 4000 rpm maximum speed is one of the biggest advantages of the B4530K family.

It can help reduce cycle time in machines that require fast rotary movement.

This makes it especially useful for high-speed indexing and repetitive motion.

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17.2 2.6 kW Rated Power

The approximately 2.6 kW continuous power rating provides a useful amount of mechanical output for medium-duty servo axes.

It offers more continuous power than the comparable B4530F 3000 rpm configuration.

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17.3 8.25 N·m Continuous Torque

The 8.25 N·m continuous stall torque gives the motor useful sustained torque capability.

It is appropriate for many packaging, assembly, positioning, and material-handling axes.

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17.4 20.3 N·m Peak Torque

The peak torque capability provides additional torque during short-duration machine acceleration and transient load conditions.

This is valuable in machines that frequently change speed.

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17.5 Low Rotor Inertia

The low rotor inertia supports rapid changes in speed.

This is particularly useful for machines with frequent indexing or reversing operations.

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17.6 Integrated Holding Brake

The 24 V DC brake allows the motor to hold its shaft when servo torque is removed.

This provides an important advantage for vertical and gravity-loaded mechanisms.

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17.7 Keyed Shaft

The keyed shaft is compatible with conventional industrial mechanical transmission systems.

It is convenient for applications using keyed couplings, gears, pulleys, and hubs.

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17.8 Flexible Connector Orientation

The right-angle connector and 180° rotation capability help simplify cable routing.

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17.9 Compact Frame

The 130 mm frame provides a reasonable balance between motor output and machine installation space.

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18. Typical Applications

18.1 Packaging Machinery

The MPL-B4530K-HJ74AA can be used for high-speed servo axes in packaging equipment.

Typical applications include:

• Film feeding
• Product indexing
• Cutting mechanisms
• Sealing mechanisms
• Label positioning
• Rotary transfer
• Conveyor synchronization
• Product positioning

The 4000 rpm speed class can be particularly useful when short machine cycles are required.

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19. Pick-and-Place Machinery

Pick-and-place systems often require fast movement followed by controlled positioning.

The low-inertia rotor helps the motor respond quickly to changing speed commands.

Typical applications include:

• Product transfer
• Component placement
• Automated loading
• Rotary positioning
• Transfer mechanisms
• Packaging handling
• Assembly systems

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20. Indexing Machines

Indexing machines repeatedly move between predefined positions.

The motor can accelerate quickly, reach the required speed, decelerate, and settle at the desired position.

Typical applications include:

• Rotary indexing tables
• Assembly stations
• Automated fixtures
• Transfer systems
• Part positioning
• Multi-station production equipment

The integrated brake can also provide additional holding capability where required.

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21. Automated Assembly Machinery

Automated assembly machines often require precise and repeatable servo movement.

The MPL-B4530K-HJ74AA can be considered for:

• Component insertion
• Part positioning
• Rotary indexing
• Tool positioning
• Automated fixtures
• Transfer mechanisms
• Screwdriving systems

The incremental encoder provides the feedback required for closed-loop motion control.

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22. Material Handling Equipment

The motor can be used in material-handling applications where fast positioning is required.

Potential applications include:

• Transfer units
• Sorting systems
• Positioning tables
• Automated conveyors
• Rotary handling
• Loading mechanisms

The integrated brake can be particularly useful for suitable vertical or inclined mechanisms.

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23. Printing and Converting Machinery

Printing and converting machines frequently require controlled roller movement and accurate synchronization.

Possible applications include:

• Feed rollers
• Registration mechanisms
• Web handling
• Cutting mechanisms
• Rotary positioning
• Indexing sections

The 4000 rpm motor class can be useful when the mechanical transmission is designed to operate at higher motor speed.

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24. Machine Tool Auxiliary Motion

The motor can also be considered for machine-tool auxiliary motion.

Possible uses include:

• Feed mechanisms
• Auxiliary rotary axes
• Automatic tool positioning
• Workpiece handling
• Fixture positioning
• Tool-changing mechanisms

The exact suitability depends on torque, speed, duty cycle, load inertia, and machine accuracy requirements.

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25. Vertical Motion Applications

The integral brake makes this model especially interesting for vertical motion.

Typical applications include:

• Vertical slides
• Lifting mechanisms
• Elevating tables
• Vertical positioning systems
• Automated loading systems
• Gravity-loaded axes

The brake can help prevent unwanted shaft movement when servo torque is removed.

However, the complete machine safety design should determine whether additional mechanical holding or safety devices are required.

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26. Recommended Machine Types

Machine Category	Suitability	Typical Function
Packaging Machine	Excellent	Feeding and indexing
Pick-and-Place Machine	Excellent	High-speed positioning
Assembly Machine	Excellent	Component positioning
Indexing Machine	Excellent	Rotary indexing
Material Handling	Good	Transfer and positioning
Conveyor System	Good	Speed synchronization
Printing Equipment	Good	Roller positioning
Converting Equipment	Good	Web handling
Machine Tool Auxiliary Axis	Good	Feed and positioning
Vertical Positioning Axis	Very Good	Lift and hold
Automated Fixture	Excellent	Positioning and holding
Rotary Transfer Machine	Excellent	Fast indexing

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27. Five Same-Series or Closely Related Models

The following models are closely related to the MPL-B4530K-HJ74AA and are useful when selecting an alternative configuration.

Model	Speed	Continuous Torque	Peak Torque	Power	Feedback	Shaft	Brake
MPL-B4530K-HJ74AA	4000 rpm	8.25 N·m	20.3 N·m	2.6 kW	2000-line incremental	Keyed	24 V DC
MPL-B4530K-HJ72AA	4000 rpm	8.25 N·m	20.3 N·m	2.6 kW	2000-line incremental	Keyed	No
MPL-B4530K-HK74AA	4000 rpm	8.25 N·m	20.3 N·m	2.6 kW	2000-line incremental	Keyless	24 V DC
MPL-B4530K-HK72AA	4000 rpm	8.25 N·m	20.3 N·m	2.6 kW	2000-line incremental	Keyless	No
MPL-B4530K-MJ74AA	4000 rpm	8.25 N·m	20.3 N·m	2.6 kW	Multi-turn absolute	Keyed	24 V DC

These configurations share the same basic B4530K motor platform while changing the feedback, shaft, or brake arrangement.

The HJ74AA is the combination of incremental feedback + keyed shaft + brake.

The HJ72AA removes the brake.

The HK74AA changes the shaft to keyless while retaining the brake.

The HK72AA changes both the shaft and brake configuration.

The MJ74AA changes the feedback architecture to multi-turn absolute feedback.

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28. MPL-B4530K-HJ72AA

Parameter	Specification
Model	MPL-B4530K-HJ72AA
Frame	130 mm
Magnet Stack	76.2 mm
Rated Speed	4000 rpm
Continuous Torque	Approx. 8.25 N·m
Peak Torque	Approx. 20.3 N·m
Rated Power	Approx. 2.6 kW
Feedback	2000-line incremental encoder
Shaft	Keyed
Brake	No
Mounting	IEC metric
Connector	SpeedTEC DIN
Approx. Weight	No-brake configuration

The HJ72AA is the closest alternative when the machine needs the same basic motor performance but does not require the integral holding brake.

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29. MPL-B4530K-HK74AA

Parameter	Specification
Model	MPL-B4530K-HK74AA
Frame	130 mm
Magnet Stack	76.2 mm
Rated Speed	4000 rpm
Continuous Torque	Approx. 8.25 N·m
Peak Torque	Approx. 20.3 N·m
Rated Power	Approx. 2.6 kW
Feedback	2000-line incremental encoder
Shaft	Keyless
Brake	24 V DC
Mounting	IEC metric
Connector	SpeedTEC DIN
Approx. Weight	Approx. 9.1 kg class

This is the closest choice when a brake is required but the machine uses a keyless coupling system.

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30. MPL-B4530K-HK72AA

Parameter	Specification
Model	MPL-B4530K-HK72AA
Frame	130 mm
Magnet Stack	76.2 mm
Rated Speed	4000 rpm
Continuous Torque	Approx. 8.25 N·m
Peak Torque	Approx. 20.3 N·m
Rated Power	Approx. 2.6 kW
Feedback	2000-line incremental encoder
Shaft	Keyless
Brake	No
Mounting	IEC metric
Connector	SpeedTEC DIN
Application	High-speed keyless servo motion

This model is suitable when the machine needs the same basic high-speed servo performance but does not require an integrated brake.

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31. MPL-B4530K-MJ74AA

Parameter	Specification
Model	MPL-B4530K-MJ74AA
Frame	130 mm
Magnet Stack	76.2 mm
Rated Speed	4000 rpm
Continuous Torque	Approx. 8.25 N·m
Peak Torque	Approx. 20.3 N·m
Rated Power	Approx. 2.6 kW
Feedback	Multi-turn absolute encoder
Shaft	Keyed
Brake	24 V DC
Encoder Resolution	1024 Sin/Cos cycles/revolution
Feedback Protocol	Hiperface
Mounting	IEC metric
Approx. Weight	Approx. 9.1 kg class

The MJ74AA is a useful alternative when the machine needs multi-turn absolute feedback instead of the 2000-line incremental encoder.

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32. MPL-B4530F-SJ74AA

Parameter	Specification
Model	MPL-B4530F-SJ74AA
Frame	130 mm
Magnet Stack	76.2 mm
Rated Speed	3000 rpm
Continuous Torque	Approx. 8.25 N·m
Peak Torque	Approx. 20.3 N·m
Rated Power	Approx. 2.1 kW
Feedback	Single-turn high-resolution absolute
Shaft	Keyed
Brake	24 V DC
Mounting	IEC metric
Approx. Weight	Approx. 9.1 kg class

The B4530F version is a useful alternative when 3000 rpm is sufficient and the application benefits from high-resolution absolute feedback.

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33. Five Same-Brand Popular Model Recommendations

The following models represent useful alternatives from the same product range, covering different speed, torque, power, and frame requirements.

Model	Speed	Continuous Torque	Peak Torque	Power	Rotor Inertia	Approx. Weight
MPL-B430P-MJ74AA	5000 rpm	6.55 N·m	19.8 N·m	2.2 kW	0.00038 kg·m²	Approx. 5.5 kg
MPL-B4530F-MJ74AA	3000 rpm	8.25 N·m	20.3 N·m	2.1 kW	0.00040 kg·m²	Approx. 7.3 kg
MPL-B4540F-MJ74AA	3000 rpm	10.2 N·m	27.1 N·m	2.6 kW	0.00052 kg·m²	Approx. 8.6 kg
MPL-B4560F-MJ74AA	3000 rpm	14.1 N·m	34.4 N·m	3.2 kW	0.00078 kg·m²	Approx. 11.82 kg
MPL-B540K-MK74AA	4000 rpm	19.4 N·m	48.6 N·m	5.4 kW	0.00147 kg·m²	Approx. 15 kg

The B430P is useful when the machine requires very high speed with a lower torque requirement.

The B4530F is a good choice for 3000 rpm applications requiring moderate torque.

The B4540F and B4560F provide higher torque capability.

The B540K is suitable for substantially heavier servo axes while retaining a 4000 rpm speed class.

The motor-family performance values for these models are listed in the MP-Series motor data.

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34. MPL-B430P-MJ74AA

Parameter	Specification
Model	MPL-B430P-MJ74AA
Series	MP-Series MPL
Rated Speed	5000 rpm
Continuous Torque	Approx. 6.55 N·m
Peak Torque	Approx. 19.8 N·m
Rated Power	Approx. 2.2 kW
Rotor Inertia	Approx. 0.00038 kg·m²
Feedback	Absolute high-resolution
Shaft	Keyed
Brake	24 V DC
Approx. Weight	5.5 kg

This is a strong option when the machine requires higher speed but does not need the torque capacity of the larger B4530K motor.

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35. MPL-B4530F-MJ74AA

Parameter	Specification
Model	MPL-B4530F-MJ74AA
Rated Speed	3000 rpm
Continuous Torque	Approx. 8.25 N·m
Peak Torque	Approx. 20.3 N·m
Rated Power	Approx. 2.1 kW
Rotor Inertia	Approx. 0.00040 kg·m²
Frame	130 mm
Magnet Stack	76.2 mm
Feedback	Absolute multi-turn
Shaft	Keyed
Brake	24 V DC
Approx. Weight	Approx. 7.3 kg class

This model is useful when the application needs absolute multi-turn feedback and a holding brake but does not require 4000 rpm.

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36. MPL-B4540F-MJ74AA

Parameter	Specification
Model	MPL-B4540F-MJ74AA
Rated Speed	3000 rpm
Continuous Torque	Approx. 10.2 N·m
Peak Torque	Approx. 27.1 N·m
Rated Power	Approx. 2.6 kW
Rotor Inertia	Approx. 0.00052 kg·m²
Stack Length	101.6 mm class
Feedback	Absolute multi-turn
Shaft	Keyed
Brake	24 V DC
Approx. Weight	8.6 kg

This model is a natural step upward when the B4530K does not provide enough continuous or peak torque.

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37. MPL-B4560F-MJ74AA

Parameter	Specification
Model	MPL-B4560F-MJ74AA
Rated Speed	3000 rpm
Continuous Torque	Approx. 14.1 N·m
Peak Torque	Approx. 34.4 N·m
Rated Power	Approx. 3.2 kW
Rotor Inertia	Approx. 0.00078 kg·m²
Feedback	Absolute multi-turn
Shaft	Keyed
Brake	24 V DC
Approx. Weight	11.82 kg

The B4560F is intended for considerably heavier-duty motion applications.

Its higher torque capacity makes it suitable for larger machine axes, heavier rotary mechanisms, and applications with higher load demand.

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38. MPL-B540K-MK74AA

Parameter	Specification
Model	MPL-B540K-MK74AA
Rated Speed	4000 rpm
Continuous Torque	Approx. 19.4 N·m
Peak Torque	Approx. 48.6 N·m
Rated Power	Approx. 5.4 kW
Rotor Inertia	Approx. 0.00147 kg·m²
Feedback	Multi-turn absolute
Shaft	Keyless
Brake	24 V DC
Approx. Weight	Approx. 15 kg
Main Advantage	High torque and high speed

This is a much larger servo motor than the B4530K and is intended for applications requiring significantly more torque and power.

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39. Comparison of the Main Related Models

Model	Speed	Continuous Torque	Peak Torque	Feedback	Shaft	Brake	Typical Application
MPL-B4530K-HJ74AA	4000 rpm	8.25 N·m	20.3 N·m	2000-line incremental	Keyed	Yes	High-speed servo with brake
MPL-B4530K-HJ72AA	4000 rpm	8.25 N·m	20.3 N·m	2000-line incremental	Keyed	No	High-speed servo without brake
MPL-B4530K-HK74AA	4000 rpm	8.25 N·m	20.3 N·m	2000-line incremental	Keyless	Yes	High-speed keyless servo
MPL-B4530K-HK72AA	4000 rpm	8.25 N·m	20.3 N·m	2000-line incremental	Keyless	No	High-speed keyless servo
MPL-B4530K-MJ74AA	4000 rpm	8.25 N·m	20.3 N·m	Multi-turn absolute	Keyed	Yes	Absolute positioning
MPL-B4530F-SJ74AA	3000 rpm	8.25 N·m	20.3 N·m	Single-turn high-resolution	Keyed	Yes	Precision positioning
MPL-B4540F-MJ74AA	3000 rpm	10.2 N·m	27.1 N·m	Multi-turn absolute	Keyed	Yes	Higher-torque servo
MPL-B4560F-MJ74AA	3000 rpm	14.1 N·m	34.4 N·m	Multi-turn absolute	Keyed	Yes	Heavy-duty servo

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40. HJ74AA vs HJ72AA

The easiest way to distinguish the two models is the brake configuration.

Feature	MPL-B4530K-HJ74AA	MPL-B4530K-HJ72AA
Speed	4000 rpm	4000 rpm
Continuous Torque	8.25 N·m	8.25 N·m
Peak Torque	20.3 N·m	20.3 N·m
Power	Approx. 2.6 kW	Approx. 2.6 kW
Feedback	2000-line incremental	2000-line incremental
Shaft	Keyed	Keyed
Brake	24 V DC	No brake
Frame	130 mm	130 mm
Stack	76.2 mm	76.2 mm
Main Difference	Integrated brake	No integral brake

If the application needs mechanical holding, the HJ74AA is the more appropriate configuration.

If the machine does not need a holding brake, the HJ72AA offers a simpler motor configuration.

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41. HJ74AA vs HK74AA

The main difference is the shaft.

Feature	MPL-B4530K-HJ74AA	MPL-B4530K-HK74AA
Speed	4000 rpm	4000 rpm
Feedback	2000-line incremental	2000-line incremental
Shaft	Keyed	Keyless
Brake	24 V DC	24 V DC
Continuous Torque	8.25 N·m	8.25 N·m
Peak Torque	20.3 N·m	20.3 N·m
Power	Approx. 2.6 kW	Approx. 2.6 kW
Frame	130 mm	130 mm
Stack	76.2 mm	76.2 mm

Choose the HJ74AA when the machine uses a keyed coupling.

Choose the HK74AA when the machine is designed around a keyless coupling.

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42. HJ74AA vs B4530F

The K and F motor families have the same basic 130 mm / 76.2 mm mechanical platform but different speed classes.

Parameter	MPL-B4530K-HJ74AA	MPL-B4530F-SJ74AA
Speed	4000 rpm	3000 rpm
Power	Approx. 2.6 kW	Approx. 2.1 kW
Continuous Torque	8.25 N·m	8.25 N·m
Peak Torque	20.3 N·m	20.3 N·m
Frame	130 mm	130 mm
Stack	76.2 mm	76.2 mm
Feedback	2000-line incremental	High-resolution absolute
Shaft	Keyed	Keyed
Brake	24 V DC	24 V DC

The B4530K is the better choice when the machine benefits from the 4000 rpm speed class.

The B4530F is more suitable when 3000 rpm is sufficient and the selected absolute-feedback configuration better matches the control requirements.

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43. HJ74AA vs Higher-Torque Motors

When more torque is needed, moving to a larger MPL motor is generally more appropriate than operating the B4530K close to its limits.

Model	Speed	Continuous Torque	Peak Torque	Power
MPL-B4530K-HJ74AA	4000 rpm	8.25 N·m	20.3 N·m	2.6 kW
MPL-B4540F-MJ74AA	3000 rpm	10.2 N·m	27.1 N·m	2.6 kW
MPL-B4560F-MJ74AA	3000 rpm	14.1 N·m	34.4 N·m	3.2 kW
MPL-B540K-MK74AA	4000 rpm	19.4 N·m	48.6 N·m	5.4 kW

This comparison shows the position of the B4530K in the MPL range.

It provides high speed and moderate torque rather than the very high torque associated with larger B4560F or B540K configurations.

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44. Application Selection Guide

Machine Requirement	Recommended Model
4000 rpm + keyed shaft + brake	MPL-B4530K-HJ74AA
4000 rpm + keyed shaft + no brake	MPL-B4530K-HJ72AA
4000 rpm + keyless shaft + brake	MPL-B4530K-HK74AA
4000 rpm + keyless shaft + no brake	MPL-B4530K-HK72AA
4000 rpm + multi-turn absolute + brake	MPL-B4530K-MJ74AA
3000 rpm + high-resolution absolute + brake	MPL-B4530F-SJ74AA
More than 10 N·m continuous torque	MPL-B4540F family
More than 14 N·m continuous torque	MPL-B4560F family
Around 19 N·m continuous torque + 4000 rpm	MPL-B540K family

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45. Installation Considerations

The MPL-B4530K-HJ74AA should be installed with adequate mechanical support and connector clearance.

Important installation considerations include:

• Correct flange alignment
• Correct shaft alignment
• Proper coupling installation
• Appropriate key fit
• Radial load
• Axial load
• Cable routing
• Connector clearance
• Brake wiring
• Motor grounding
• Servo drive compatibility
• Load inertia
• Machine resonance
• Thermal conditions

The keyed shaft should be correctly matched with the selected coupling or mechanical transmission component.

The integrated brake wiring should also be designed correctly because the brake is an electrically controlled holding mechanism.

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46. Load Inertia Considerations

The low rotor inertia of approximately 0.00040 kg·m² provides a good foundation for fast servo response.

However, the motor does not operate independently from the machine.

The connected load can have a much larger reflected inertia.

Examples include:

• Large rotary tables
• Rollers
• Gear trains
• Flywheels
• Heavy pulleys
• Large positioning mechanisms
• Long belt-driven systems

The reflected load inertia should be calculated through the transmission ratio before final motor selection.

A properly sized motor should provide sufficient continuous torque while also maintaining acceptable dynamic performance.

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47. Vertical Axis Considerations

The integrated 24 V DC brake is particularly useful for vertical axes.

A vertical axis can experience gravitational torque even when the servo command is zero.

When servo power is removed, the load may attempt to move unless a suitable holding mechanism is present.

The brake provides an additional holding function.

Typical vertical applications include:

• Lift axes
• Vertical slides
• Elevating tables
• Z-axis positioning
• Vertical transfer mechanisms
• Automated loading systems

For safety-critical machinery, the brake should be considered as one part of the complete machine safety system rather than as the only safety device.

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48. Why Choose the MPL-B4530K-HJ74AA?

The MPL-B4530K-HJ74AA is particularly attractive when the machine needs a combination of high speed, moderate torque, low inertia, keyed mechanical transmission, incremental feedback, and integrated holding capability.

Its main technical strengths can be summarized as follows:

• 4000 rpm high-speed operation
• 2.6 kW continuous power
• 8.25 N·m continuous stall torque
• 20.3 N·m peak torque
• Approximately 0.00040 kg·m² rotor inertia
• 130 mm frame
• 76.2 mm magnet stack
• 2000-line incremental encoder
• Keyed shaft
• 24 V DC holding brake
• Right-angle SpeedTEC DIN connector
• 180° connector rotation
• IEC metric mounting

This is a balanced configuration for industrial machines that need both speed and controlled mechanical holding.

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49. Main Advantages at a Glance

Advantage	Description
High-Speed Operation	4000 rpm maximum speed
Continuous Power	Approx. 2.6 kW
Continuous Torque	Approx. 8.25 N·m
Peak Torque	Approx. 20.3 N·m
Low Rotor Inertia	Approx. 0.00040 kg·m²
High-Speed Servo Response	Suitable for rapid acceleration and deceleration
Incremental Feedback	2000-line encoder
Keyed Shaft	Conventional mechanical coupling interface
Integrated Brake	24 V DC holding brake
Compact Frame	130 mm frame
Compact Stack	76.2 mm magnet stack
Flexible Connector	Right-angle SpeedTEC DIN
Connector Adjustment	180° rotation
Metric Mounting	IEC metric flange
Industrial Flexibility	Suitable for many automated machine axes

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50. Product Selection Checklist

Before selecting the MPL-B4530K-HJ74AA for a machine, the following points should be reviewed:

Selection Item	Requirement to Check
Motor Speed	Is 4000 rpm appropriate?
Continuous Torque	Is 8.25 N·m sufficient?
Peak Torque	Is 20.3 N·m sufficient for acceleration?
Power	Is approximately 2.6 kW adequate?
Feedback	Is 2000-line incremental feedback suitable?
Shaft	Does the machine require a keyed shaft?
Brake	Is a 24 V DC holding brake required?
Frame	Is 130 mm mechanically suitable?
Stack	Is 76.2 mm acceptable?
Weight	Can the machine support approximately 9.1 kg?
Connector	Is there sufficient rear cable clearance?
Load Inertia	Is the reflected load inertia acceptable?
Coupling	Is the coupling compatible with the keyed shaft?
Drive	Is the selected servo drive compatible with the motor feedback and electrical configuration?
Safety	Is the brake arrangement adequate for the complete machine safety concept?

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51. Final Technical Summary

Category	MPL-B4530K-HJ74AA
Brand	Allen-Bradley
Product Family	MP-Series
Product Series	MPL Low-Inertia Brushless Servo Motors
Model	MPL-B4530K-HJ74AA
Product Type	AC Rotary Servo Motor
Voltage Class	400 V AC
Motor Voltage Reference	460 V AC
Nominal Operating Speed	Approx. 3010 rpm
Maximum Motor Speed	4000 rpm
Continuous Rated Power	Approx. 2.6 kW
Continuous Stall Torque	Approx. 8.25 N·m
Peak Stall Torque	Approx. 20.3 N·m
Rotor Inertia	Approx. 0.00040 kg·m²
Feedback	2000-line incremental encoder
Shaft	Keyed
Shaft Seal	No
Brake	Integrated
Brake Voltage	24 V DC
Brake Type	Holding brake
Frame Size	130 mm
Frame Equivalent	5.12 in.
Magnet Stack	76.2 mm
Stack Equivalent	3.0 in.
Mounting	IEC metric
Mounting Holes	Free mounting holes / Type FF
Connector	SpeedTEC DIN
Connector Style	Right-angle
Connector Rotation	180°
Approx. Brake Motor Weight	9.1 kg
Weight in Pounds	Approx. 20 lb
Primary Application	Industrial motion control
Main Strength	High-speed servo motion with integrated holding brake
Typical Machine Types	Packaging, indexing, assembly, material handling, positioning, printing, converting

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52. Final Product Description

The MPL-B4530K-HJ74AA is a high-speed, low-inertia industrial AC servo motor designed for automated machinery requiring precise closed-loop motion and reliable mechanical holding.

Its 4000 rpm maximum speed makes it particularly suitable for high-cycle machines where rapid rotary movement is important.

With approximately 2.6 kW continuous rated power, 8.25 N·m continuous stall torque, and 20.3 N·m peak torque, the motor provides a practical combination of speed and torque for medium-duty industrial servo axes.

The 130 mm frame and 76.2 mm magnet stack give the motor a relatively compact mechanical footprint for its performance class.

The approximately 0.00040 kg·m² rotor inertia supports rapid acceleration and deceleration, making the motor useful for indexing, pick-and-place, packaging, assembly, and other repetitive motion applications.

The 2000-line incremental encoder provides closed-loop feedback for speed and position control.

The keyed shaft extension provides a conventional mechanical interface for compatible couplings, pulleys, gears, and other machine transmission components.

The most important additional feature of the HJ74AA configuration is its integrated 24 V DC holding brake.

This brake makes the motor especially useful for applications where the shaft or load needs to remain held after servo torque is removed.

For example, vertical positioning systems, lifting mechanisms, vertical slides, and gravity-loaded axes can benefit from the additional holding function.

The right-angle SpeedTEC DIN connector and approximately 180° rotational adjustment also provide useful flexibility during machine installation.

Overall, the MPL-B4530K-HJ74AA can be viewed as a 4000 rpm, 2.6 kW, low-inertia servo motor with keyed shaft, incremental feedback, and integrated 24 V DC brake, designed for industrial machines that require fast and repeatable motion together with mechanical holding capability.

It is particularly well suited to packaging machines, indexing systems, automated assembly equipment, pick-and-place machinery, material-handling equipment, printing and converting machinery, rotary transfer systems, and vertical positioning applications.

When selecting this model, the most important factors are the required continuous torque, peak torque, operating speed, load inertia, shaft loading, feedback requirements, mounting space, brake requirements, cable routing, and servo-drive compatibility.

For the same 4000 rpm motor platform without a brake, the MPL-B4530K-HJ72AA is the closer alternative.

For a keyless shaft with the same basic brake-equipped configuration, the MPL-B4530K-HK74AA is the more appropriate alternative.

For multi-turn absolute feedback, the MPL-B4530K-MJ74AA is a better choice.

For applications requiring more continuous torque, larger MPL configurations such as the MPL-B4540F, MPL-B4560F, or MPL-B540K families should be considered.

The MPL-B4530K-HJ74AA therefore occupies a useful position within the MPL range: it combines 4000 rpm high-speed performance, 2.6 kW power, 8.25 N·m continuous torque, 20.3 N·m peak torque, low rotor inertia, incremental feedback, a keyed shaft, and an integrated 24 V DC holding brake in a 130 mm-class motor package.