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Allen-Bradley MPL-B4530K-HJ72AA Servo Motor

1. Product Overview

The MPL-B4530K-HJ72AA is a 400 V class AC rotary servo motor from the MP-Series MPL low-inertia brushless servo motor family.

It is designed for industrial motion-control applications that require accurate positioning, fast acceleration and deceleration, repeatable movement, and stable servo performance.

This particular configuration combines a 130 mm frame size, 76.2 mm magnet stack, 4000 rpm rated speed, 2.6 kW continuous rated power, and approximately 8.25 N·m continuous stall torque.

The motor uses a 2000-line incremental encoder, a keyed shaft extension, and a no-brake configuration. It also uses a right-angle SpeedTEC DIN connector with 180° rotational capability, providing flexibility for cable routing in compact machine designs.

The MPL-B4530K-HJ72AA is especially suitable for applications where higher operating speed is more important than the 3000 rpm speed class offered by the comparable MPL-B4530F family.

The K-series motor configuration is rated at 4000 rpm, while retaining the same general 130 mm frame and 76.2 mm magnet-stack mechanical platform used by the B4530 family.

The model is also a low-inertia servo motor, making it suitable for machinery with frequent acceleration, deceleration, indexing, synchronization, and direction changes.

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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-HJ72AA
Product Type	AC Rotary Servo Motor
Voltage Class	400 V AC
Armature Voltage	460 V
Rated Speed	4000 rpm
Continuous Rated Power	Approx. 2.6 kW
Feedback	2000-line incremental encoder
Shaft	Keyed shaft extension
Brake	No integral brake
Frame Size	130 mm
Magnet Stack	76.2 mm
Mounting	IEC metric
Connector	SpeedTEC DIN
Connector Style	Right-angle
Connector Rotation	180°
Motor Design	Low inertia
Approx. Weight	6.8–8.56 kg depending on catalog/configuration

The MPL-B4530K-HJ72AA belongs to the MP-Series MPL family, which was developed around low-inertia brushless servo motor technology.

The B4530K configuration is intended for applications requiring a higher 4000 rpm speed class while maintaining a relatively compact motor package.

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3. Detailed Technical Parameters

Parameter	MPL-B4530K-HJ72AA
Model	MPL-B4530K-HJ72AA
Brand	Allen-Bradley
Series	MP-Series MPL
Motor Type	Low-Inertia Brushless AC Servo Motor
Voltage Class	400 V AC
Armature Voltage	460 V
Rated Speed	4000 rpm
Maximum Speed	4000 rpm
Rated Continuous 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
Feedback Type	Incremental
Encoder Resolution	2000 lines/revolution
Shaft	Keyed shaft extension
Shaft Key	Yes
Shaft Seal	No
Brake	No integral brake
Frame Size	130 mm
Frame Equivalent	5.12 in.
Magnet Stack	76.2 mm
Magnet Stack Equivalent	3.0 in.
Mounting	IEC metric
Mounting Holes	Free mounting holes, Type FF
Connector	SpeedTEC DIN
Connector Position	Right-angle
Connector Rotation	180°
Approx. Weight	6.8–8.56 kg
Typical Application	Industrial motion control
Motor Family	MP-Series MPL

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

The exact HJ72AA configuration is identified with a 2000-line incremental encoder, keyed shaft, no brake, 130 mm frame, and 76.2 mm stack.

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4. Dimensions and Mechanical Parameters

The physical configuration of the MPL-B4530K-HJ72AA is centered around a 130 mm frame and 76.2 mm magnet stack.

Mechanical Parameter	Specification
Frame Size	130 mm
Frame Size in Inches	5.12 in.
Magnet Stack Length	76.2 mm
Magnet Stack in Inches	3.0 in.
Shaft Configuration	Keyed
Shaft Extension	Keyed shaft extension
Shaft Seal	No
Brake	No brake
Mounting Standard	IEC metric
Mounting Type	Free mounting holes / Type FF
Connector	SpeedTEC DIN
Connector Style	Right-angle
Connector Rotation	180°
Approx. Weight	6.8–8.56 kg

The 130 mm frame is an important dimensional reference when designing the motor mounting structure.

The 76.2 mm magnet stack corresponds to the “30” stack designation in the MPL catalog structure.

For machine design, the complete motor envelope should be checked against the mechanical drawing for the exact motor revision because shaft length, connector clearance, mounting details, and rear connector orientation can influence the final installation dimensions.

The exact overall external dimensions should therefore not be replaced by a simple frame-size value. The 130 mm frame and 76.2 mm stack describe the primary motor geometry, while the complete mounting envelope depends on the detailed mechanical configuration.

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5. Weight

Weight is an important consideration when designing a moving servo axis, especially for gantry systems, robot arms, linear stages, and high-speed positioning mechanisms.

Available product listings for the HJ72AA configuration identify a weight around 6.8 kg, while some detailed product listings show approximately 8.555 kg for the complete catalog configuration.

Weight Reference	Value
Common catalog weight reference	Approx. 6.8 kg
Detailed product listing	Approx. 8.555 kg
Practical design range	Approx. 6.8–8.56 kg

For general product comparison, approximately 6.8 kg is a useful reference value for the HJ72AA configuration, while actual shipping or catalog weight can vary depending on the exact configuration and packaging.

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6. Electrical Performance

The MPL-B4530K-HJ72AA is designed for the 400 V AC class and uses a 460 V armature voltage configuration.

Its rated speed of 4000 rpm is one of the main differences between the B4530K and the B4530F motor families.

Electrical / Performance Parameter	Value
Voltage Class	400 V AC
Armature Voltage	460 V
Rated Speed	4000 rpm
Continuous Rated Power	Approx. 2.6 kW
Continuous Stall Torque	8.25 N·m
Peak Stall Torque	20.3 N·m
Rotor Inertia	Approx. 0.00040 kg·m²

The 4000 rpm rating gives this motor a strong advantage in applications where the machine cycle requires rapid rotary movement.

For a machine with repeated short-distance positioning cycles, higher motor speed can allow the designer to reach the required machine velocity without selecting an unnecessarily large motor.

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7. Torque Characteristics

The motor provides approximately 8.25 N·m continuous stall torque and 20.3 N·m peak stall torque.

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

The continuous torque figure is important when evaluating the sustained mechanical load.

The peak torque value is more relevant during acceleration, rapid deceleration, transient loading, and short-duration high-demand motion.

For proper motor selection, the application should be evaluated based on the complete motion profile rather than selecting the motor solely according to peak torque.

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8. Low-Inertia Motor Design

The MPL-B4530K-HJ72AA uses a low-inertia rotor design.

Its rotor inertia is approximately 0.00040 kg·m².

Low rotor inertia allows the motor to respond quickly when the commanded speed changes.

This is particularly useful for machines that repeatedly accelerate and decelerate.

Typical examples include indexing machines, packaging equipment, pick-and-place systems, automated assembly machinery, and fast positioning axes.

Characteristic	Benefit
Low Rotor Inertia	Faster acceleration
Low Rotor Inertia	Faster deceleration
Low Rotor Inertia	Improved dynamic response
Low Rotor Inertia	Useful for rapid indexing
Low Rotor Inertia	Suitable for repeated direction changes
Low Rotor Inertia	Can improve machine cycle performance

The motor’s low-inertia characteristics should still be evaluated together with the actual load inertia.

A very large external load relative to the motor rotor can affect servo response, tuning, and acceleration performance.

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9. Feedback System

The HJ72AA configuration uses a 2000-line incremental encoder.

Feedback Parameter	Specification
Feedback Type	Incremental encoder
Resolution	2000 lines/revolution
Feedback Function	Position and speed feedback
Application	Servo motion control
Encoder Type	Incremental
Position Reference	Machine control / servo feedback

The incremental encoder provides the motion-control system with feedback about motor rotation.

This feedback is used for speed regulation, position control, acceleration and deceleration management, and closed-loop servo operation.

The 2000-line configuration is a practical choice for many industrial motion applications where incremental feedback is appropriate.

It also makes this motor different from MPL configurations using single-turn or multi-turn absolute encoders.

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10. Keyed Shaft Extension

The MPL-B4530K-HJ72AA uses a keyed shaft extension.

Shaft Parameter	Specification
Shaft Type	Keyed
Shaft Extension	Keyed shaft
Shaft Key	Yes
Shaft Seal	No
Coupling Type	Compatible keyed coupling
Typical Application	Direct mechanical transmission

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

For machine builders already using keyed hubs and couplings, this configuration can be convenient because the shaft interface follows a familiar mechanical arrangement.

The shaft and coupling should be selected together, with attention to torque, speed, radial load, axial load, shaft fit, and allowable overhung load.

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11. No Integral Brake

The MPL-B4530K-HJ72AA is a no-brake configuration.

Brake Parameter	Specification
Integral Brake	No
Brake Configuration	No brake
Primary Design Focus	High-speed servo motion
Suitable Application	Axes where a motor holding brake is not required

The absence of a brake reduces the mechanical complexity of the motor.

It can also be advantageous when the machine already has an external holding mechanism or when the axis does not require mechanical holding after servo power is removed.

This configuration is particularly reasonable for horizontal motion axes where gravity does not create a significant back-driving force.

For vertical axes or gravity-loaded mechanisms, the absence of an integral brake should be carefully considered.

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12. SpeedTEC DIN Connector

The motor uses a SpeedTEC DIN connector in a right-angle configuration.

The connector can be rotated approximately 180°, giving the machine designer additional freedom when arranging cables.

Connector Parameter	Specification
Connector Type	SpeedTEC DIN
Orientation	Right-angle
Rotation	180°
Connection Style	Quick-connect
Main Advantage	Flexible cable routing

This connector arrangement is particularly useful in machines where there is limited space behind the motor.

A right-angle connector can keep the cable closer to the machine frame, while the rotational feature allows the cable exit direction to be adjusted.

This can reduce cable interference with guards, moving mechanisms, machine covers, and neighboring components.

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13. Mounting Configuration

The motor uses an IEC metric flange mounting configuration with free mounting holes.

Mounting Parameter	Specification
Mounting Standard	IEC metric
Flange Type	Metric flange
Mounting Holes	Free mounting holes
Type	FF
Frame	130 mm

The metric mounting configuration makes the motor suitable for machine structures based on metric mechanical dimensions.

When designing the mounting plate, the motor flange dimensions, bolt-hole pattern, shaft centerline, shaft extension, connector clearance, and service access should all be considered.

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14. Product Introduction

The MPL-B4530K-HJ72AA is designed as a high-speed, low-inertia servo motor for automated industrial machinery.

Its strongest characteristic is the combination of a 4000 rpm operating class with a relatively compact 130 mm frame.

The motor delivers approximately 8.25 N·m continuous stall torque and 20.3 N·m peak torque, making it suitable for medium-duty servo axes where both speed and torque are important.

The 2000-line incremental encoder provides feedback for closed-loop motion control.

The keyed shaft gives the motor a conventional mechanical coupling interface.

The absence of an integral brake keeps the configuration focused on servo motion rather than mechanical holding.

The motor’s right-angle SpeedTEC DIN connector provides flexibility during machine installation and cable routing.

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15. Main Product Advantages

15.1 High 4000 rpm Speed

The 4000 rpm rating is one of the main advantages of the B4530K configuration.

Compared with a 3000 rpm motor, the higher speed class can help machines achieve faster rotary motion and shorter cycle times when the application is speed-limited.

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15.2 2.6 kW Continuous Power

The motor is rated at approximately 2.6 kW continuous power.

This provides a useful level of power for medium-duty automated machine axes.

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15.3 Strong Peak Torque

With approximately 20.3 N·m peak torque, the motor has additional short-duration torque capacity for acceleration and transient loads.

This is useful in applications with rapid changes in velocity.

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15.4 Low Rotor Inertia

The approximate rotor inertia of 0.00040 kg·m² supports rapid dynamic response.

This makes the motor particularly suitable for applications where the servo axis must repeatedly accelerate and decelerate.

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15.5 Compact 130 mm Frame

The 130 mm frame provides a relatively compact mechanical package for its performance class.

This can be useful when machine space is limited.

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15.6 Keyed Shaft

The keyed shaft provides a familiar mechanical connection for conventional industrial couplings and transmission components.

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15.7 Flexible Connector Arrangement

The right-angle SpeedTEC DIN connector with 180° rotation gives machine designers more freedom when planning cable routing.

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15.8 Simple No-Brake Configuration

The no-brake configuration is suitable for applications that do not require a built-in holding brake.

This can simplify the motor configuration for horizontal axes and other applications where an external brake or mechanical holding mechanism is already available.

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16. Typical Applications

16.1 Packaging Machinery

The motor can be used for high-speed motion functions in packaging equipment.

Typical applications include:

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

The 4000 rpm speed rating is especially useful when short machine cycles require rapid motor movement.

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17. Pick-and-Place Machinery

Pick-and-place equipment often requires rapid acceleration followed by accurate positioning.

The low-inertia motor design can support this operating pattern.

Typical applications include:

• Component handling
• Product transfer
• Automated loading
• High-speed placement
• Rotary positioning
• Transfer mechanisms

The motor is particularly suitable where the moving load is moderate and the machine prioritizes fast cycle times.

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18. Indexing Machines

Indexing machines repeatedly move between defined positions.

A servo motor must accelerate quickly, reach the desired speed, decelerate accurately, and settle at the commanded position.

The B4530K’s low inertia and 4000 rpm rating make it well suited to this type of operating profile.

Typical applications include:

• Rotary indexing tables
• Assembly stations
• Transfer mechanisms
• Part positioning
• Automated fixtures

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19. Material Handling Equipment

The motor can also be used in material-handling machinery.

Possible applications include:

• Conveyor positioning
• Transfer systems
• Sorting mechanisms
• Rotary handling
• Automated loading
• Positioning tables

For vertical lifting applications, the no-brake configuration should be evaluated carefully because a separate holding mechanism may be required.

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20. Assembly Machinery

Automated assembly machines often require precise, repeatable movement.

The MPL-B4530K-HJ72AA can be considered for:

• Part positioning
• Component insertion
• Rotary indexing
• Automated tooling
• Screwdriving mechanisms
• Fixture positioning
• Transfer systems

The incremental encoder provides the feedback required for closed-loop servo operation.

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21. Printing and Converting Equipment

Printing and converting machinery often requires controlled roller movement and synchronization.

Potential applications include:

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

The 4000 rpm speed class can be useful when machine rollers or transmission ratios require higher motor speed.

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22. Machine Tool Auxiliary Axes

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

Possible uses include:

• Feed mechanisms
• Positioning axes
• Tool-changing mechanisms
• Workpiece handling
• Auxiliary rotary axes
• Automated fixtures

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

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23. Typical Machine Categories

Machine Category	Suitability	Typical Function
Packaging Machine	Excellent	Feeding and indexing
Pick-and-Place Machine	Excellent	High-speed positioning
Assembly Machine	Excellent	Part positioning
Indexing Machine	Excellent	Rotary indexing
Conveyor System	Good	Speed control
Material Handling	Good	Transfer and positioning
Printing Machine	Good	Roller control
Converting Machine	Good	Web handling
Machine Tool Auxiliary Axis	Good	Feed and positioning
Automated Fixture	Good	Rotary positioning
Horizontal Transfer Axis	Excellent	Fast positioning
Vertical Axis	Conditional	Requires external holding solution

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24. Five Same-Series or Closely Related Models

The following models are useful alternatives or comparison models within the same MPL family.

Model	Speed	Continuous Torque	Peak Torque	Power	Feedback	Shaft	Brake	Main Difference
MPL-B4530K-HJ72AA	4000 rpm	8.25 N·m	20.3 N·m	2.6 kW	2000-line incremental	Keyed	No	Target model
MPL-B4530K-HK72AA	4000 rpm	8.25 N·m	20.3 N·m	2.6 kW	2000-line incremental	Keyless	No	Keyless shaft
MPL-B4530K-HJ74AA	4000 rpm	8.25 N·m	20.3 N·m	2.6 kW	2000-line incremental	Keyed	24 V DC	Brake version
MPL-B4530K-HK74AA	4000 rpm	8.25 N·m	20.3 N·m	2.6 kW	2000-line incremental	Keyless	24 V DC	Keyless + brake
MPL-B4530K-MJ72AA	4000 rpm	8.25 N·m	20.3 N·m	2.6 kW	Multi-turn absolute	Keyed	No	Absolute feedback

The HJ72AA, HK72AA, HJ74AA, and HK74AA configurations mainly differ in shaft and brake arrangement, while the MJ72AA changes the feedback architecture to multi-turn absolute feedback.

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25. Recommended Related Model: 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
Power	Approx. 2.6 kW
Feedback	2000-line incremental encoder
Shaft	Keyless
Brake	No
Mounting	IEC metric
Connector	SpeedTEC DIN
Weight	Approx. 6.8 kg class

This is one of the closest mechanical alternatives to the HJ72AA.

The main difference is the shaft.

The HJ72AA uses a keyed shaft, while the HK72AA uses a keyless shaft.

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26. Recommended Related Model: MPL-B4530K-HJ74AA

Parameter	Specification
Model	MPL-B4530K-HJ74AA
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
Power	Approx. 2.6 kW
Feedback	2000-line incremental encoder
Shaft	Keyed
Brake	24 V DC
Mounting	IEC metric
Connector	SpeedTEC DIN
Application	High-speed servo motion with holding brake

The HJ74AA is the natural choice when the machine needs the same basic keyed-shaft and incremental-feedback arrangement but requires an integrated holding brake.

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27. Recommended Related Model: 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
Power	Approx. 2.6 kW
Feedback	2000-line incremental encoder
Shaft	Keyless
Brake	24 V DC
Connector	SpeedTEC DIN
Mounting	IEC metric
Application	High-speed servo axis with keyless shaft and brake

This configuration combines the keyless shaft arrangement with the integrated brake.

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28. Recommended Related Model: MPL-B4530K-MJ72AA

Parameter	Specification
Model	MPL-B4530K-MJ72AA
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
Power	Approx. 2.6 kW
Feedback	Absolute multi-turn encoder
Shaft	Keyed
Brake	No
Encoder	1024 Sin/Cos cycles/revolution
Protocol	Hiperface
Rotor Inertia	Approx. 0.00040 kg·m²
Mounting	IEC metric

The MJ72AA is particularly interesting when absolute multi-turn feedback is more important than the incremental encoder configuration.

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29. Recommended Related Model: MPL-B4530F-SK74AA

Parameter	Specification
Model	MPL-B4530F-SK74AA
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
Power	Approx. 2.1 kW
Feedback	Single-turn high-resolution absolute
Shaft	Keyless
Brake	24 V DC
Mounting	IEC metric
Approx. Weight	Approx. 7.3 kg class

The SK74AA is a useful alternative when the machine does not require the 4000 rpm speed class but does require absolute feedback and a holding brake.

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30. Five Same-Brand Popular Model Recommendations

The following models provide useful alternatives when comparing different motor sizes and performance levels.

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-MK72AA	4000 rpm	19.4 N·m	48.6 N·m	5.4 kW	Approx. 0.00147 kg·m²	Approx. 15 kg class

The MPL-B430P is a good choice for higher-speed, lower-torque applications.

The B4530F is suitable for applications where 3000 rpm and moderate torque are sufficient.

The B4540F and B4560F provide progressively higher torque and power.

The B540K is a substantially larger motor for applications requiring considerably more torque while retaining a 4000 rpm operating class.

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31. 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
Main Advantage	High-speed, lightweight servo motion

This motor is a strong candidate when high rotational speed and low moving mass are important.

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32. 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
Power	Approx. 2.1 kW
Rotor Inertia	Approx. 0.00040 kg·m²
Frame	130 mm
Stack	76.2 mm
Feedback	Absolute multi-turn
Shaft	Keyed
Brake	24 V DC
Approx. Weight	Approx. 7.3 kg

This is a useful alternative when multi-turn absolute feedback is required but 3000 rpm is sufficient.

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33. 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
Power	Approx. 2.6 kW
Rotor Inertia	Approx. 0.00052 kg·m²
Stack	101.6 mm
Feedback	Absolute multi-turn
Shaft	Keyed
Brake	24 V DC
Approx. Weight	Approx. 8.6 kg

This model is a practical step upward when the B4530 family does not provide enough continuous or peak torque.

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34. 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
Power	Approx. 3.2 kW
Rotor Inertia	Approx. 0.00078 kg·m²
Stack	152.4 mm class
Feedback	Absolute multi-turn
Shaft	Keyed
Brake	24 V DC
Approx. Weight	Approx. 11.82 kg

The B4560F provides substantially more torque than the B4530K and is better suited to heavier-duty machine axes.

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35. MPL-B540K-MK72AA

Parameter	Specification
Model	MPL-B540K-MK72AA
Rated Speed	4000 rpm
Continuous Torque	Approx. 19.4 N·m
Peak Torque	Approx. 48.6 N·m
Power	Approx. 5.4 kW
Rotor Inertia	Approx. 0.00147 kg·m²
Feedback	Absolute multi-turn
Shaft	Keyless
Brake	No
Approx. Weight	Approx. 15 kg class
Main Advantage	High torque with 4000 rpm speed class

This is a much larger motor than the B4530K and should be considered when the machine requires substantially higher torque and power.

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36. Comparison of the Main Related Models

Model	Speed	Torque	Feedback	Shaft	Brake	Best Use
MPL-B4530K-HJ72AA	4000 rpm	8.25 / 20.3 N·m	2000-line incremental	Keyed	No	High-speed general servo motion
MPL-B4530K-HK72AA	4000 rpm	8.25 / 20.3 N·m	2000-line incremental	Keyless	No	High-speed precision coupling
MPL-B4530K-HJ74AA	4000 rpm	8.25 / 20.3 N·m	2000-line incremental	Keyed	Yes	High-speed motion with holding brake
MPL-B4530K-HK74AA	4000 rpm	8.25 / 20.3 N·m	2000-line incremental	Keyless	Yes	High-speed motion with brake
MPL-B4530K-MJ72AA	4000 rpm	8.25 / 20.3 N·m	Absolute multi-turn	Keyed	No	Absolute multi-turn positioning
MPL-B4530F-SK74AA	3000 rpm	8.25 / 20.3 N·m	Absolute single-turn	Keyless	Yes	Precise positioning with brake
MPL-B4540F-MJ74AA	3000 rpm	10.2 / 27.1 N·m	Absolute multi-turn	Keyed	Yes	Higher torque applications
MPL-B4560F-MJ74AA	3000 rpm	14.1 / 34.4 N·m	Absolute multi-turn	Keyed	Yes	Heavy-duty servo axes

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37. Main Difference Between B4530K and B4530F

One of the most important comparisons is between the B4530K and B4530F versions.

Parameter	MPL-B4530K-HJ72AA	MPL-B4530F-SJ72AA
Rated Speed	4000 rpm	3000 rpm
Continuous 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
Rotor Inertia	Approx. 0.00040 kg·m²	Approx. 0.00040 kg·m² class
Feedback	2000-line incremental	High-resolution absolute
Shaft	Keyed	Keyed
Brake	No	No

The B4530K is primarily attractive because of its 4000 rpm speed class.

The B4530F is more focused on the 3000 rpm class and can be configured with different high-resolution feedback options.

For machines where speed is the main concern, the B4530K configuration can be more appropriate.

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38. Advantages for Machine Builders

The MPL-B4530K-HJ72AA provides several practical advantages during machine development.

Compact Servo Package

The 130 mm frame provides a relatively compact mechanical package.

High-Speed Operation

The 4000 rpm rating supports fast machine cycles.

Moderate Torque Capacity

The 8.25 N·m continuous torque rating covers many medium-duty servo applications.

Low Rotor Inertia

The low rotor inertia supports dynamic machine movement.

Traditional Keyed Shaft

The keyed shaft simplifies integration with many standard mechanical transmission components.

Flexible Cable Direction

The rotatable right-angle connector helps machine builders manage limited installation space.

Incremental Feedback

The 2000-line incremental encoder provides a proven feedback arrangement for closed-loop servo control.

No-Brake Simplicity

For applications without a brake requirement, the no-brake version avoids unnecessary mechanical complexity.

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39. Application Selection Guide

Application Requirement	Recommended Configuration
High-speed horizontal axis	MPL-B4530K-HJ72AA
Keyed mechanical coupling	MPL-B4530K-HJ72AA
Keyless precision coupling	MPL-B4530K-HK72AA
High-speed axis requiring brake	MPL-B4530K-HJ74AA
High-speed axis with keyless shaft and brake	MPL-B4530K-HK74AA
Multi-turn absolute positioning	MPL-B4530K-MJ72AA
3000 rpm absolute single-turn positioning	MPL-B4530F-SK74AA
Higher torque requirement	MPL-B4540F / MPL-B4560F
High torque and 4000 rpm	MPL-B540K family

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40. Installation Considerations

The motor should be installed with sufficient clearance around the frame and connector.

Particular attention should be paid to:

• Motor flange alignment
• Shaft alignment
• Coupling concentricity
• Radial load
• Axial load
• Cable bending radius
• Connector clearance
• Motor ventilation
• Ambient temperature
• Load inertia
• Servo tuning
• Mechanical resonance

Because the HJ72AA uses a keyed shaft, the coupling should be correctly matched to the shaft dimensions and key arrangement.

The motor should not be exposed to mechanical loads beyond its allowable shaft-load limits.

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41. Load Inertia Considerations

Servo motor selection should always consider the relationship between motor inertia and load inertia.

The MPL-B4530K-HJ72AA has a relatively low rotor inertia of approximately 0.00040 kg·m².

This is advantageous for fast motion, but the machine designer must still consider the reflected inertia of the connected load.

For example, a high-speed rotary table, large roller, gearbox, or heavily loaded mechanism can present a much larger reflected inertia than the motor rotor itself.

In such cases, proper gearing, acceleration profiles, servo tuning, and motor sizing become important.

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42. Horizontal and Vertical Applications

The HJ72AA is especially straightforward for horizontal applications because it does not include an integral holding brake.

Typical horizontal applications include:

• Conveyors
• Transfer axes
• Rotary positioning
• Packaging feeds
• Horizontal slides
• Indexing mechanisms

Vertical applications require additional attention.

If the load can fall or back-drive the motor when servo torque is removed, an external holding mechanism or another appropriate safety solution may be necessary.

The no-brake configuration should therefore not be selected for a gravity-loaded axis without reviewing the complete machine design.

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43. Why Choose the MPL-B4530K-HJ72AA?

The MPL-B4530K-HJ72AA is a strong choice when the machine needs a 4000 rpm low-inertia servo motor with approximately 2.6 kW continuous power and 8.25 N·m continuous torque.

Its most important characteristics are the combination of:

• 4000 rpm rated speed
• 2.6 kW rated power
• 8.25 N·m continuous stall torque
• 20.3 N·m peak stall torque
• 130 mm frame
• 76.2 mm magnet stack
• 2000-line incremental encoder
• Keyed shaft
• No integral brake
• Low rotor inertia
• Right-angle SpeedTEC DIN connector
• 180° connector rotation

This combination makes it particularly attractive for high-speed industrial motion applications.

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44. Main Advantages at a Glance

Advantage	Description
4000 rpm Speed	Supports fast machine cycles
2.6 kW Power	Provides useful continuous mechanical output
8.25 N·m Continuous Torque	Suitable for medium-duty servo axes
20.3 N·m Peak Torque	Supports acceleration and transient loads
Low Rotor Inertia	Improves dynamic response
130 mm Frame	Compact industrial package
76.2 mm Stack	Useful torque-producing length
2000-Line Encoder	Reliable incremental feedback
Keyed Shaft	Convenient conventional coupling interface
No Brake	Simple configuration for non-brake applications
Right-Angle Connector	Helps with compact installation
180° Connector Rotation	Flexible cable routing
IEC Metric Mounting	Suitable for metric machine construction

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45. Final Technical Summary

Category	MPL-B4530K-HJ72AA
Brand	Allen-Bradley
Product Family	MP-Series
Series	MPL Low-Inertia Brushless Servo Motors
Model	MPL-B4530K-HJ72AA
Product Type	AC Rotary Servo Motor
Voltage Class	400 V AC
Armature Voltage	460 V
Rated 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
Brake	No
Shaft Seal	No
Frame Size	130 mm
Frame Equivalent	5.12 in.
Magnet Stack	76.2 mm
Magnet 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. Weight	6.8–8.56 kg
Primary Application	Industrial servo motion
Main Strength	High-speed, low-inertia motion
Typical Machine Type	Packaging, indexing, assembly, material handling, positioning

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46. Final Product Description

The MPL-B4530K-HJ72AA is a high-speed, low-inertia industrial AC servo motor designed for demanding automated motion applications.

With a 4000 rpm rated speed, 2.6 kW continuous power, 8.25 N·m continuous stall torque, and 20.3 N·m peak torque, it provides a useful combination of speed and torque for medium-duty machine axes.

Its 130 mm frame and 76.2 mm magnet stack provide a relatively compact mechanical package, while the low-inertia rotor supports fast acceleration and deceleration.

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

The keyed shaft extension offers a conventional mechanical interface for compatible couplings and transmission components.

The no-brake configuration makes the motor well suited to horizontal motion axes and other applications where an integral holding brake is not required.

The right-angle SpeedTEC DIN connector, together with its approximately 180° rotational capability, gives machine designers additional flexibility when arranging cables in compact equipment.

Overall, the MPL-B4530K-HJ72AA is best suited to machines that place a strong emphasis on high operating speed, fast dynamic response, accurate servo control, compact installation, and conventional keyed mechanical transmission.

Typical applications include packaging machinery, indexing systems, automated assembly equipment, pick-and-place machines, material-handling systems, printing and converting equipment, positioning tables, and auxiliary machine-tool axes.

When selecting this motor, the most important points to verify are the required continuous torque, peak torque, speed profile, load inertia, shaft loading, mounting dimensions, feedback requirements, cable arrangement, and whether the application requires an integral holding brake.

For applications that require a brake, the HJ74AA or HK74AA configurations are more appropriate.

For applications requiring a keyless shaft, the HK72AA configuration provides a closer mechanical match.

For applications requiring absolute multi-turn feedback, the MJ72AA configuration is a more suitable alternative.

For applications requiring greater torque, larger MPL motor families such as the B4540F, B4560F, or B540K configurations can be considered.

The MPL-B4530K-HJ72AA therefore occupies a useful position in the MPL motor range: it provides 4000 rpm high-speed performance, approximately 2.6 kW power, 8.25 N·m continuous torque, low rotor inertia, incremental feedback, and a keyed shaft in a 130 mm-class motor package.