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1. Product Overview

The MPL-A4540C-SJ74AA is a low-inertia AC servo motor from the MP-Series MPL servo motor family. It is designed for industrial motion-control systems where accurate positioning, controlled acceleration and deceleration, repeatable movement, and stable torque performance are required.

This model belongs to the 230/240 V-class MPL motor range and uses a 130 mm frame with a 101.6 mm magnet-stack length. The motor is rated for approximately 1500 rpm and provides approximately 10.2 N·m of continuous stall torque and 27.1 N·m of peak stall torque.

The MPL-A4540C-SJ74AA is equipped with a single-turn high-resolution feedback system, a keyed shaft, a right-angle rotatable DIN-style motor connector, and a 24 V DC holding brake. These features make it suitable for machinery where accurate closed-loop motion and mechanical load holding are required.

The motor is generally used together with a compatible servo drive, motion controller, feedback cable, power cable and properly sized mechanical transmission. It is not intended to operate as an ordinary stand-alone induction motor.

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2. Brand and Product Family

Item	Description
Brand	Allen-Bradley
Product family	MP-Series
Motor series	MPL Low-Inertia Brushless Servo Motors
Product type	Rotary AC Servo Motor
Motor construction	Brushless permanent-magnet servo motor
Voltage class	230/240 V AC class
Frame size	130 mm
Motor speed class	1500 rpm
Feedback type	Single-turn high-resolution feedback
Brake	24 V DC holding brake
Shaft	Keyed shaft
Mounting	IEC metric flange mounting
Connector	Right-angle rotatable DIN-style connector
Primary function	Closed-loop industrial motion control

The MP-Series MPL family is designed around relatively low rotor inertia, making these motors suitable for machine axes that repeatedly accelerate, decelerate, stop and reverse.

The MPL-A4540C-SJ74AA is one of the larger motors within the A4540C configuration group and provides substantially more continuous torque than the smaller MPL motor configurations.

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3. Detailed Technical Specifications

Parameter	Specification
Model	MPL-A4540C-SJ74AA
Brand	Allen-Bradley
Series	MP-Series MPL
Motor type	Low-inertia brushless AC servo motor
Voltage class	230/240 V AC
Rated speed	1500 rpm
Rated power	Approximately 1.5 kW
Continuous stall torque	10.2 N·m
Peak stall torque	27.1 N·m
Continuous stall current	Approximately 9.4 A
Peak stall current	Approximately 29 A
Rotor inertia	Approximately 0.00052 kg·m²
Frame size	130 mm
Frame designation	45
Magnet stack length	101.6 mm
Stack designation	40
Feedback	Single-turn high-resolution absolute feedback
Encoder type	High-resolution Sin/Cos / absolute feedback configuration
Shaft type	Keyed
Brake	Integrated 24 V DC holding brake
Connector	Right-angle DIN-style connector
Connector arrangement	Rotatable quick-connect configuration
Mounting	Metric flange mounting
Mounting hole arrangement	Free mounting holes
Approximate motor diameter	130 mm
Approximate overall configured length	302 mm
Approximate weight	13 kg
Operating application	Industrial servo motion
Typical control mode	Position, velocity and torque control through a compatible servo drive

The exact operating torque available at a particular speed depends on the servo drive, supply voltage, ambient temperature, duty cycle and application conditions. The continuous stall torque rating should therefore not be interpreted as the continuous torque available at every speed.

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4. Main Performance Characteristics

4.1 Rated Speed

The motor has a nominal rated speed of approximately 1500 rpm.

This speed makes the A4540C configuration suitable for applications where controlled torque and positioning are more important than extremely high motor speed.

Compared with high-speed versions of the MPL family, the 1500 rpm configuration is better suited to systems where the mechanical transmission is designed around moderate rotational speed.

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4.2 Continuous Stall Torque

The continuous stall torque is approximately 10.2 N·m.

This is an important specification when evaluating the motor for positioning, indexing, feeding and other cyclic machine movements.

A servo motor’s continuous torque capability must always be considered together with the actual operating speed and duty cycle. The motor may be capable of producing considerably different torque levels as operating conditions change.

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4.3 Peak Stall Torque

The peak stall torque is approximately 27.1 N·m.

This higher short-duration torque capability is useful during acceleration, deceleration and transient load conditions.

For example, a machine may require significantly more torque for a short period while accelerating a heavy load. The peak torque capability provides additional short-term motor capacity without requiring the motor to operate continuously at the peak value.

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4.4 Low Rotor Inertia

The rotor inertia is approximately 0.00052 kg·m².

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

When the motor needs to accelerate and decelerate frequently, excessive rotor inertia can make the motion system slower to respond. A lower-inertia rotor can help the servo system achieve quicker response and reduce the amount of torque required simply to accelerate the motor’s own rotating mass.

This characteristic is particularly useful in indexing machines, packaging machinery, pick-and-place equipment and other repetitive motion systems.

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5. Feedback System

The MPL-A4540C-SJ74AA uses a single-turn high-resolution feedback configuration.

Feedback is fundamental to a servo system because the drive needs information about motor position and movement in order to regulate the motor accurately.

The single-turn configuration provides high-resolution position information within one motor revolution. This is useful for applications where the machine control system requires accurate positioning but does not necessarily require multi-turn absolute position information from the motor itself.

The high-resolution feedback also supports accurate velocity regulation and closed-loop positioning.

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6. Integrated 24 V DC Brake

A major feature of the MPL-A4540C-SJ74AA is the integrated 24 V DC holding brake.

The brake is particularly useful when the motor is used on a vertical axis or another mechanism where the load could move when the motor is de-energized.

Typical examples include:

• Vertical lifting mechanisms
• Z-axis machine slides
• Vertical positioning tables
• Material-handling lifts
• Assembly equipment with vertical actuators
• Automated machinery where a mechanical holding function is required

The brake should primarily be regarded as a holding brake, rather than a replacement for a properly engineered dynamic stopping system.

For safety-related applications, the machine designer should determine whether additional mechanical protection, counterbalancing, safety brakes or other measures are necessary.

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7. Mechanical Construction

The motor uses a 130 mm frame size and approximately 101.6 mm magnet-stack length.

The motor uses a keyed shaft arrangement, allowing it to be connected to suitable couplings, pulleys, gears and other mechanical transmission components.

The mounting arrangement follows a metric flange configuration, making it suitable for conventional industrial machine construction.

The right-angle connector arrangement can also be useful where the motor is installed in a confined mechanical space.

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8. Dimensions and Weight

The following values are suitable for preliminary equipment planning.

Mechanical Parameter	Approximate Value
Frame diameter	130 mm
Frame size	130 mm
Magnet stack length	101.6 mm
Approx. overall length, configured with brake and feedback	302 mm
Approx. motor envelope	Ø130 × 302 mm
Shaft diameter	Approximately 24.9 mm
Key	Approximately 8 × 7 × 32 mm
Mounting system	Metric flange
Brake	Integrated
Approximate weight without brake configuration	Around 9.5 kg
Approximate weight with brake configuration	Around 13 kg
Approximate weight of MPL-A4540C-SJ74AA	13 kg

The 13 kg value is particularly important for the specified SJ74AA configuration because the integrated brake increases the motor assembly weight compared with a non-brake version.

The actual installation envelope should allow additional space for cable routing, connector access, maintenance and mechanical clearance.

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9. Model Number Interpretation

The model designation MPL-A4540C-SJ74AA can be viewed as a combination of family, motor size and configuration information.

Model Code	General Meaning
MPL	MPL low-inertia servo motor family
A	230/240 V-class motor family
45	130 mm frame-size designation
40	101.6 mm stack-length designation
C	1500 rpm motor configuration
S	Single-turn feedback configuration
J	Keyed shaft configuration
7	Right-angle rotatable connector configuration
4	24 V DC brake configuration
AA	Detailed configuration suffix

The model code is useful when comparing closely related motors because several MPL motors can share the same basic electromagnetic platform while differing in feedback, brake, connector and mechanical configuration.

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10. Product Introduction

The MPL-A4540C-SJ74AA is designed for machines that need controlled rotary movement rather than simple fixed-speed rotation.

A conventional motor may be appropriate when the only requirement is to rotate a shaft continuously at a relatively fixed speed. A servo motor is different because it forms part of a feedback-controlled motion system.

The motor, encoder, servo drive and motion controller work together.

The controller determines the desired motion.

The servo drive supplies controlled electrical power to the motor.

The feedback system continuously provides motor position information.

The control system then adjusts the motor operation to reduce the difference between commanded movement and actual movement.

This arrangement allows the machine to perform repeatable positioning, synchronized motion, controlled acceleration and controlled deceleration.

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11. Typical Product Applications

Packaging Machinery

The motor can be used in packaging equipment where products or packaging materials need to be positioned accurately.

Typical applications include indexing systems, feeding mechanisms, cutting mechanisms, sealing mechanisms and synchronized conveyor axes.

The servo’s feedback system allows movement to be coordinated with other machine functions.

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Material Handling

The motor can be used for controlled material movement where the load needs to start, stop and position repeatedly.

Examples include automated conveyors, transfer mechanisms, indexing tables and positioning systems.

The integrated brake can also be useful for vertical material-handling applications where the load needs to remain mechanically held.

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Assembly Machinery

Automated assembly equipment often requires repeatable positioning and controlled motion.

The motor can be used to operate rotary positioning systems, feeders, tooling mechanisms and other machine axes.

The combination of feedback and servo control allows the motor to move according to a programmed motion profile rather than simply running continuously.

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Printing and Converting Machinery

Printing and converting machines frequently require synchronization between multiple rotating and linear axes.

A servo motor can provide controlled movement for rollers, feeders, cutting systems and indexing mechanisms.

The high-resolution feedback configuration is useful when precise synchronization is required.

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Machine Tools

The motor can be used for controlled auxiliary axes, indexing mechanisms and positioning equipment.

The 1500 rpm speed configuration can be appropriate where the machine’s mechanical transmission is designed around moderate-speed operation.

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Pick-and-Place Equipment

The low-inertia design can be useful in repetitive pick-and-place applications.

Such equipment often requires frequent acceleration and deceleration, and the motor must respond quickly to changing movement commands.

The actual suitability depends on the moving mass, transmission ratio, acceleration profile and cycle time.

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Vertical Positioning Systems

The integrated 24 V DC brake is particularly useful in vertical applications.

When the servo system is disabled, the brake can provide mechanical holding capability.

This can help maintain the position of a vertical load, although the complete machine should still be designed with appropriate mechanical and safety provisions.

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12. Product Advantages

12.1 Low-Inertia Servo Design

The low-inertia rotor is useful for machines that require repeated acceleration and deceleration.

A lower motor inertia can help the servo system respond efficiently to changes in the commanded motion profile.

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12.2 High Continuous Torque

The approximately 10.2 N·m continuous stall torque gives the motor a substantial continuous torque capability for its frame class.

This makes it suitable for applications where a smaller high-speed motor may not provide sufficient torque.

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12.3 High Peak Torque

The approximately 27.1 N·m peak stall torque provides additional short-duration torque capacity.

This is useful during acceleration, transient loading and rapid changes in machine movement.

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12.4 High-Resolution Feedback

The single-turn high-resolution feedback configuration supports accurate closed-loop operation.

This is important for machines that require repeatable positioning and stable speed regulation.

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12.5 Integrated Holding Brake

The 24 V DC brake provides a useful mechanical holding function.

It is especially relevant to vertical axes and machines where the motor must hold a load after servo power is removed.

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12.6 Compact Frame

The 130 mm frame provides a relatively compact mechanical envelope considering the motor’s approximately 10.2 N·m continuous stall torque rating.

This can be beneficial when machine space is limited.

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12.7 Keyed Shaft

The keyed shaft is a familiar industrial mechanical interface.

It can be used with compatible couplings, pulleys, gears and other transmission components.

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12.8 Flexible Connector Arrangement

The right-angle connector can simplify cable routing around the rear of the motor.

The rotatable configuration provides additional flexibility during machine installation.

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13. Five Same-Series or Closely Related Models

The following models are closely related to the MPL-A4540C-SJ74AA and are useful when comparing different feedback or brake configurations.

Model	Motor Series	Speed	Power	Continuous Stall Torque	Peak Stall Torque	Feedback	Brake	Frame / Stack	Dimensions	Weight
MPL-A4540C-SJ72AA	MPL	1500 rpm	1.5 kW	10.2 N·m	27.1 N·m	Single-turn high-resolution	No	130 / 101.6 mm	Approx. Ø130 × 254 mm	9.5 kg
MPL-A4540C-SJ74AA	MPL	1500 rpm	1.5 kW	10.2 N·m	27.1 N·m	Single-turn high-resolution	24 V DC	130 / 101.6 mm	Approx. Ø130 × 302 mm	13 kg
MPL-A4540C-MJ72AA	MPL	1500 rpm	1.5 kW	10.2 N·m	27.1 N·m	Multi-turn high-resolution	No	130 / 101.6 mm	Approx. Ø130 × 254 mm	9.5 kg
MPL-A4540C-MJ74AA	MPL	1500 rpm	1.5 kW	10.2 N·m	27.1 N·m	Multi-turn high-resolution	24 V DC	130 / 101.6 mm	Approx. Ø130 × 302 mm	13 kg
MPL-A4540C-SK72AA	MPL	1500 rpm	1.5 kW	10.2 N·m	27.1 N·m	Single-turn high-resolution	No	130 / 101.6 mm	Approx. Ø130 × 254 mm	9.5 kg

These models share the same basic A4540C motor platform, so the main differences are associated with feedback configuration, brake configuration and mechanical/electrical option coding.

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14. Detailed Comparison of Related A4540C Models

Specification	MPL-A4540C-SJ72AA	MPL-A4540C-SJ74AA	MPL-A4540C-MJ72AA	MPL-A4540C-MJ74AA	MPL-A4540C-SK72AA
Voltage class	230/240 V	230/240 V	230/240 V	230/240 V	230/240 V
Rated speed	1500 rpm	1500 rpm	1500 rpm	1500 rpm	1500 rpm
Power	1.5 kW	1.5 kW	1.5 kW	1.5 kW	1.5 kW
Continuous torque	10.2 N·m	10.2 N·m	10.2 N·m	10.2 N·m	10.2 N·m
Peak torque	27.1 N·m	27.1 N·m	27.1 N·m	27.1 N·m	27.1 N·m
Feedback	Single-turn	Single-turn	Multi-turn	Multi-turn	Single-turn
Brake	No	24 V DC	No	24 V DC	No
Frame	130 mm	130 mm	130 mm	130 mm	130 mm
Stack length	101.6 mm	101.6 mm	101.6 mm	101.6 mm	101.6 mm
Shaft	Keyed	Keyed	Keyed	Keyed	Keyed
Approx. diameter	130 mm	130 mm	130 mm	130 mm	130 mm
Approx. length	254 mm	302 mm	254 mm	302 mm	254 mm
Approx. weight	9.5 kg	13 kg	9.5 kg	13 kg	9.5 kg

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15. Five Additional Popular Models Under the Same Brand

The following models provide a broader selection of servo motor configurations from the same brand. They cover smaller motors, higher-speed motors and higher-power motors.

Model	Series	Speed	Power	Continuous Stall Torque	Peak Stall Torque	Feedback Configuration	Brake	Approx. Dimensions	Weight
MPL-A310F-MJ22AA	MP-Series MPL	3000 rpm	0.46 kW	1.58 N·m	3.61 N·m	Multi-turn high-resolution	No	Approx. Ø100 × 193 mm	3.0 kg
MPL-A320P-MJ22AA	MP-Series MPL	5000 rpm	1.3 kW	3.05 N·m	7.91 N·m	Multi-turn high-resolution	No	Approx. Ø100 × 193 mm	4.0 kg
MPL-A430P-MK22AA	MP-Series MPL	5000 rpm	2.2 kW	5.99 N·m	19.8 N·m	Multi-turn configuration	No	Approx. Ø115 × 212 mm	6.4 kg
MPL-A520K-SJ22AA	MP-Series MPL	4000 rpm	3.5 kW	10.7 N·m	24.3 N·m	Single-turn configuration	No	Approx. Ø165 × 285 mm	11.3 kg
MPL-A540K-SJ22AA	MP-Series MPL	4000 rpm	5.5 kW	19.4 N·m	48.6 N·m	Single-turn configuration	No	Approx. Ø165 × 335 mm	16.5 kg

The models above represent different positions within the same general servo motor product range. The smaller A310F is suited to lower-power applications, while the A520K and A540K provide substantially greater power and torque capability.

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16. Detailed Comparison with Additional Models

Model	Speed	Power	Continuous Stall Torque	Peak Stall Torque	Rotor / Motor Class	Approx. Weight	Approx. Dimensions
MPL-A310F-MJ22AA	3000 rpm	0.46 kW	1.58 N·m	3.61 N·m	Small-frame low-inertia servo	3.0 kg	Ø100 × 193 mm
MPL-A320P-MJ22AA	5000 rpm	1.3 kW	3.05 N·m	7.91 N·m	Compact high-speed servo	4.0 kg	Ø100 × 193 mm
MPL-A430P-MK22AA	5000 rpm	2.2 kW	5.99 N·m	19.8 N·m	Medium-frame high-speed servo	6.4 kg	Ø115 × 212 mm
MPL-A520K-SJ22AA	4000 rpm	3.5 kW	10.7 N·m	24.3 N·m	Higher-power servo	11.3 kg	Ø165 × 285 mm
MPL-A540K-SJ22AA	4000 rpm	5.5 kW	19.4 N·m	48.6 N·m	High-power servo	16.5 kg	Ø165 × 335 mm

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17. A4540C Compared with Other Motor Sizes

The MPL-A4540C-SJ74AA occupies a useful middle position within the MPL motor range.

Its approximately 1.5 kW power rating is considerably above the smaller compact servo configurations, while its 10.2 N·m continuous stall torque provides a substantially higher torque capability than many small high-speed servo motors.

At the same time, it is physically smaller and lighter than some of the higher-power motor configurations.

This makes the A4540C configuration particularly relevant to machines where the designer needs a balance between torque capacity, speed, physical size and servo response.

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18. Product Selection Considerations

When selecting the MPL-A4540C-SJ74AA for an actual machine, several factors should be considered.

Load Torque

The required continuous load torque should be calculated under the most demanding normal operating condition.

The motor should have sufficient continuous torque capacity with an appropriate engineering margin.

Peak Acceleration Torque

The acceleration requirement can be considerably higher than the steady-state running torque.

The motor’s peak torque capability should therefore be compared against the acceleration torque requirement.

Load Inertia

The inertia of the driven machine component can have a major effect on servo performance.

For systems using gears, belts, ball screws, pulleys or other mechanical transmissions, the load inertia should be converted to the motor shaft for proper servo sizing.

Operating Speed

The maximum required motor speed should remain within the appropriate motor and drive operating range.

The A4540C is a 1500 rpm configuration, so it should not automatically be substituted for a high-speed servo simply because the torque rating appears adequate.

Duty Cycle

The motor may operate differently under continuous rotation, intermittent positioning, rapid indexing or repeated acceleration/deceleration.

The duty cycle should be considered when determining the required motor size.

Brake Requirement

If the motor operates a vertical axis or another gravity-loaded mechanism, the brake option becomes an important consideration.

The SJ74AA configuration includes the 24 V DC brake, while some closely related configurations do not.

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19. Typical Machine Functions

The MPL-A4540C-SJ74AA can be considered for the following machine functions:

Machine Function	Suitability of Application
Rotary indexing	Suitable
Conveyor positioning	Suitable
Packaging feed	Suitable
Cutting mechanism	Suitable
Material positioning	Suitable
Automated assembly	Suitable
Pick-and-place axis	Suitable depending on load
Vertical positioning	Suitable with appropriate brake/safety design
Rotary table	Suitable
Machine-tool auxiliary axis	Suitable
Printing/converting axis	Suitable depending on synchronization requirements
Continuous high-speed spindle	Less aligned with its 1500 rpm configuration
Simple constant-speed fan/pump	Servo capability may be unnecessary

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20. Installation Considerations

The motor should be mounted on a rigid and properly aligned machine structure.

Improper shaft alignment can produce excessive radial or axial loads and may reduce bearing life.

The coupling or transmission component should be correctly matched to the keyed shaft.

Cable routing should also be planned carefully because the motor connector and cable assembly require sufficient bending clearance.

The brake wiring should be correctly integrated into the machine’s control architecture.

The motor should be paired with a compatible servo drive and feedback interface rather than being connected directly to an ordinary motor starter.

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21. Why the SJ74AA Configuration Is Different

The SJ74AA suffix is important because it identifies a specific combination of motor options.

Compared with a basic non-brake A4540C configuration, the SJ74AA provides:

• Single-turn feedback
• High-resolution feedback capability
• Keyed shaft
• Right-angle connector configuration
• 24 V DC holding brake
• The same basic 1500 rpm A4540C electromagnetic platform

The brake-equipped configuration also increases the overall motor length and weight.

This is why two motors with the same A4540C designation can have noticeably different mechanical dimensions and mass depending on their suffix configuration.

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22. Main Product Advantages at a Glance

Advantage	Description
Low inertia	Supports responsive acceleration and deceleration
10.2 N·m continuous torque	Provides substantial continuous torque capability
27.1 N·m peak torque	Provides additional short-duration torque
1500 rpm speed	Appropriate for moderate-speed motion applications
High-resolution feedback	Supports accurate closed-loop positioning
Single-turn configuration	Suitable for precise within-revolution positioning
Integrated brake	Useful for holding vertical or gravity-loaded axes
130 mm frame	Compact relative to its torque capability
Keyed shaft	Conventional industrial mechanical interface
Right-angle connector	Helps with cable routing
1.5 kW power class	Suitable for a broad range of industrial machine axes

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23. Complete Reference Table

Item	MPL-A4540C-SJ74AA
Model	MPL-A4540C-SJ74AA
Brand	Allen-Bradley
Product family	MP-Series
Series	MPL Low-Inertia Brushless Servo Motors
Product category	Rotary servo motor
Motor technology	Brushless AC servo
Voltage class	230/240 V AC
Rated speed	1500 rpm
Rated power	1.5 kW
Continuous stall torque	10.2 N·m
Peak stall torque	27.1 N·m
Continuous stall current	Approx. 9.4 A
Peak stall current	Approx. 29 A
Rotor inertia	Approx. 0.00052 kg·m²
Frame	45
Frame size	130 mm
Stack	40
Magnet stack length	101.6 mm
Feedback	Single-turn high-resolution
Shaft	Keyed
Brake	24 V DC
Connector	Right-angle rotatable DIN style
Mounting	IEC metric
Approx. diameter	130 mm
Approx. overall length	302 mm
Approx. weight	13 kg
Typical applications	Packaging, positioning, assembly, material handling, indexing and motion-control equipment

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24. Final Product Summary

The MPL-A4540C-SJ74AA is a 230/240 V-class, 1.5 kW low-inertia servo motor designed for industrial closed-loop motion applications.

Its main performance characteristics are a 1500 rpm rated speed, approximately 10.2 N·m continuous stall torque, approximately 27.1 N·m peak stall torque and approximately 0.00052 kg·m² rotor inertia.

The motor uses a 130 mm frame and 101.6 mm magnet stack, giving it a substantial torque capability while retaining a relatively compact industrial form factor.

The single-turn high-resolution feedback makes the motor suitable for applications requiring accurate position and velocity control.

The integrated 24 V DC brake adds an important mechanical holding function, particularly for vertical axes and gravity-loaded mechanisms.

The keyed shaft and metric flange mounting make the motor suitable for conventional industrial machine construction, while the right-angle connector arrangement provides additional flexibility for cable installation.

For applications that require the same basic motor without a brake, the MPL-A4540C-SJ72AA is a closely related configuration.

For applications requiring multi-turn feedback, the MPL-A4540C-MJ72AA and MPL-A4540C-MJ74AA provide closely related alternatives.

For applications requiring higher motor speed, the MPL-A4540F family moves the basic A4540 platform into the approximately 3000 rpm class.

For applications requiring substantially more power and torque, the larger MPL-A520K and MPL-A540K configurations provide higher-power alternatives.

Overall, the MPL-A4540C-SJ74AA is characterized by its combination of moderate 1500 rpm operating speed, high continuous torque, low-inertia construction, high-resolution feedback, keyed mechanical interface and integrated 24 V DC holding brake, making it a practical servo-motor configuration for a wide range of industrial positioning and motion-control equipment.