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Allen-Bradley MPL-B320P-MJ72AA Servo Motor

1. Product Overview

The Allen-Bradley MPL-B320P-MJ72AA is a low-inertia brushless AC rotary servo motor designed for industrial motion-control applications where high speed, accurate feedback, repeatable positioning, and fast dynamic response are required.

It belongs to the MP-Series MPL Low-Inertia Brushless Servo Motor family and uses a 460 V-class electrical configuration, a 100 mm frame, a 50.8 mm magnetic stack, and a rated speed of 5000 RPM.

The motor is configured with an absolute multi-turn high-resolution encoder, a keyed shaft extension, a SpeedTEC DIN right-angle connector, and no integral brake.

This configuration makes the MPL-B320P-MJ72AA particularly suitable for machine axes that require continuous closed-loop feedback and absolute multi-turn position information without the need for a mechanical holding brake.

The motor provides approximately 3.05 N·m continuous torque, approximately 7.91 N·m peak torque, and approximately 1.5 kW continuous rated power.

Its low-inertia rotor is designed for rapid acceleration and deceleration, which is valuable in machinery with frequent indexing, positioning, reversing, and high-cycle motion.

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2. Basic Product Parameters

Parameter	Specification
Model	MPL-B320P-MJ72AA
Brand	Allen-Bradley
Product Family	MP-Series MPL
Product Series	MPL Low-Inertia Brushless Servo Motors
Product Type	AC Rotary Servo Motor
Motor Construction	Brushless permanent-magnet servo motor
Voltage Class	460 V AC
Armature Voltage	460 V
Rated Speed	5000 RPM
Maximum Speed	5000 RPM
Continuous Output Torque	3.05 N·m
Peak Output Torque	7.91 N·m
Continuous Rated Power	1.5 kW
Frame Size	100 mm
Frame Designation	Frame 3
Magnetic Stack	50.8 mm
Stack Designation	20
Feedback	Absolute multi-turn high-resolution encoder
Feedback Resolution	Sin/Cos, 1024 cycles/revolution
Feedback Protocol	Hiperface
Shaft	Keyed shaft extension
Brake	No integral brake
Connector	SpeedTEC DIN
Connector Style	Right-angle
Connector Rotation	180° rotatable
Mounting	IEC metric flange
Mounting Holes	Free mounting holes, Type FF
Shaft Seal	No shaft seal
Rotor Inertia	Approximately 0.000078 kg·m²
Approximate Motor Weight	Approximately 4.5 kg
Frame Dimension	100 mm nominal
Magnetic Stack Dimension	50.8 mm
Overall Dimensions	Verify exact mechanical drawing
Operating Temperature Reference	Up to approximately 40 °C
Intended Application	Closed-loop industrial motion control

The exact model configuration identifies the motor as a 460 V-class, 100 mm frame, 50.8 mm stack, 5000 RPM servo motor with multi-turn high-resolution absolute feedback, keyed shaft, SpeedTEC DIN connector, and no brake.

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3. Product Introduction

The MPL-B320P-MJ72AA is designed for applications where the motor must repeatedly respond to position, speed, and acceleration commands from a servo controller.

Unlike a conventional induction motor used mainly for constant-speed operation, a servo motor is designed as part of a complete closed-loop motion system.

The motor receives controlled electrical power from the servo drive, while the encoder continuously provides shaft-position information back to the control system.

This feedback allows the servo system to monitor actual shaft movement and make corrections according to the commanded position or velocity.

The MPL-B320P-MJ72AA uses a multi-turn high-resolution absolute encoder, which is one of the most important characteristics distinguishing this model from other MPL-B320P configurations.

The absolute feedback system is especially useful in machines where position information must be retained accurately across multiple revolutions and where the control architecture is designed around absolute feedback.

The motor also uses a keyed shaft rather than a keyless shaft.

This makes it suitable for mechanical systems using compatible keyed couplings, pulleys, gears, or other keyed transmission components.

The absence of an integral brake makes this configuration different from brake-equipped versions such as the corresponding 74 configurations.

For applications where a vertical load must be mechanically held after the servo is disabled, the machine designer needs to determine whether an external holding arrangement or a brake-equipped motor is required.

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4. Brand

Brand: Allen-Bradley

The MPL-B320P-MJ72AA is an Allen-Bradley servo motor.

For catalog identification, it is classified under the MP-Series MPL family of low-inertia brushless servo motors.

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5. Product Series

Series: MP-Series MPL Low-Inertia Brushless Servo Motors

The MPL series is designed around compact brushless servo motors intended for industrial motion-control systems.

The series includes multiple motor frame sizes, stack lengths, speed classes, feedback configurations, shaft styles, connector arrangements, and brake options.

The MPL-B320P represents a particular 100 mm-frame, 50.8 mm-stack, 5000 RPM motor platform.

The letters and numbers following the basic B320P designation specify the feedback system, shaft arrangement, connector configuration, and brake option.

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6. Model Number Explanation

The catalog number is:

MPL-B320P-MJ72AA

The individual portions can be interpreted as follows.

Model Code	Description
MPL	MPL low-inertia brushless servo motor family
B	460 V-class configuration
3	Frame 3 / 100 mm frame
20	50.8 mm magnetic stack
P	5000 RPM speed class
M	Multi-turn high-resolution absolute encoder
J	Keyed shaft extension
7	SpeedTEC DIN right-angle connector, 180° rotatable
2	No integral brake
AA	Standard catalog configuration designation

This model coding is particularly useful when comparing similar motors.

For example, changing the J shaft designation to a K designation changes the shaft configuration from keyed to keyless.

Likewise, changing the 2 brake designation to 4 indicates a brake-equipped configuration.

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7. Detailed Technical Specifications

Technical Parameter	MPL-B320P-MJ72AA
Model	MPL-B320P-MJ72AA
Motor Type	Brushless AC rotary servo
Voltage Class	460 V AC
Armature Voltage	460 V
Rated Speed	5000 RPM
Maximum Speed	5000 RPM
Continuous Torque	3.05 N·m
Peak Torque	7.91 N·m
Continuous Power	1.5 kW
Frame Size	100 mm
Frame Number	3
Magnetic Stack Length	50.8 mm
Stack Number	20
Feedback Type	Absolute multi-turn high-resolution encoder
Encoder Resolution	Sin/Cos, 1024 cycles/rev
Feedback Protocol	Hiperface
Shaft Type	Keyed shaft extension
Brake	None
Connector	SpeedTEC DIN
Connector Orientation	Right-angle
Connector Adjustment	180° rotatable
Mounting	IEC metric flange
Mounting Hole Type	Free mounting holes, Type FF
Shaft Seal	No shaft seal
Rotor Inertia	7.8 × 10⁻⁵ kg·m²
Approximate Weight	4.5 kg
Frame Dimension	100 mm
Stack Dimension	50.8 mm
Overall Length	Verify exact mechanical drawing
Overall Diameter	Verify exact mechanical drawing
Shaft Projection	Verify exact mechanical drawing
Mounting Bolt Circle	Verify exact mechanical drawing

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8. Power Rating

The MPL-B320P-MJ72AA has a continuous rated power of approximately 1.5 kW.

This places the motor in a useful medium-power servo class for many industrial machine axes.

The power rating should not be considered independently from torque and speed.

Servo applications are usually evaluated using the complete motion profile, including acceleration, deceleration, dwell time, load torque, operating speed, peak torque, RMS torque, and duty cycle.

A motor that has adequate rated power may still be unsuitable if its peak torque capability or thermal capacity is insufficient for the actual motion profile.

For this reason, the 1.5 kW rating should be considered together with the approximately 3.05 N·m continuous torque and 7.91 N·m peak torque.

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9. Continuous and Peak Torque

Torque Parameter	Value
Model	MPL-B320P-MJ72AA
Continuous Output Torque	3.05 N·m
Peak Output Torque	7.91 N·m
Continuous Torque	Approx. 27 lb-in
Peak Torque	Approx. 70 lb-in
Rated Speed	5000 RPM
Rated Power	1.5 kW

The 3.05 N·m continuous torque represents the approximate continuous output torque capability under the specified operating conditions.

The 7.91 N·m peak torque provides additional short-duration torque for acceleration, deceleration, positioning corrections, and temporary load disturbances.

In normal servo operation, peak torque is generally used intermittently rather than continuously.

The actual permissible peak duration depends on the drive, motor thermal conditions, duty cycle, and application requirements.

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10. High-Speed 5000 RPM Operation

The MPL-B320P-MJ72AA is rated for 5000 RPM.

The high-speed rating makes it suitable for applications requiring rapid machine cycles and high-speed rotary movement.

When connected to a ball screw, belt drive, gearbox, pulley system, or other mechanical transmission, the actual machine-axis speed depends on the transmission ratio.

A 5000 RPM motor can therefore be used in both relatively high-speed and mechanically reduced applications.

The final machine speed should always be calculated from the motor speed and the transmission ratio.

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11. Multi-Turn High-Resolution Absolute Encoder

One of the most important features of the MPL-B320P-MJ72AA is its absolute multi-turn high-resolution encoder.

The encoder uses a Sin/Cos feedback format with approximately 1024 cycles per revolution and a Hiperface feedback protocol.

The multi-turn absolute configuration provides position information across multiple shaft revolutions.

This is different from a basic incremental encoder configuration.

An incremental encoder primarily reports changes in position from a reference point, while an absolute encoder provides coded position information that can be interpreted by a compatible control system.

The multi-turn characteristic is particularly useful in applications where the axis can rotate through many revolutions and the control system needs to distinguish the accumulated position.

Typical applications include long-travel linear axes, rotary positioning systems, machine tools, automated assembly equipment, and other motion systems where absolute position information is valuable.

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12. Advantages of Absolute Multi-Turn Feedback

The absolute multi-turn feedback arrangement can provide several practical advantages.

First, it can simplify machine positioning because the control system has access to absolute shaft-position information.

Second, multi-turn feedback is useful when the mechanical axis travels through multiple motor revolutions.

Third, high-resolution feedback supports precise control of position and velocity.

Fourth, absolute feedback can reduce dependence on a traditional reference process in systems designed to use absolute positioning.

The actual machine behavior depends on the complete servo system, including the drive, controller, feedback interface, mechanical transmission, and machine software.

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13. Keyed Shaft Configuration

The J designation indicates a keyed shaft extension.

A keyed shaft is intended for compatible mechanical couplings and transmission components that use a shaft key.

This configuration is common in servo applications where positive mechanical torque transmission is required between the motor shaft and the driven component.

The keyway also makes the mechanical interface different from a keyless configuration.

When replacing a motor, the shaft diameter, key dimensions, shaft projection, coupling design, and mounting arrangement should all be checked.

A motor with the same electrical ratings but a different shaft configuration should not automatically be considered a mechanical replacement.

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14. No Integral Brake

The 2 portion of the model number identifies the no-brake configuration.

The MPL-B320P-MJ72AA does not have an integral 24 V DC holding brake.

This can be advantageous for applications where no mechanical holding function is needed.

It also avoids the additional brake-related wiring and control requirements associated with brake-equipped motor configurations.

However, the lack of a brake should be carefully considered for vertical or gravity-loaded axes.

If the machine load can move when motor torque is removed, an appropriate external holding mechanism or a brake-equipped servo motor may be required.

The motor’s servo torque should not be treated as a substitute for a properly engineered mechanical holding or safety system.

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15. SpeedTEC DIN Connector

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

The connector can be rotated through approximately 180 degrees.

This is useful for machine builders because cable routing can be adjusted according to the available installation space.

The connector orientation can be particularly important when the motor is installed close to machine frames, guarding, linear guides, gearboxes, or other equipment.

The right-angle configuration also helps reduce the amount of space required behind the motor compared with a straight connector arrangement.

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16. Frame Size and Dimensions

The MPL-B320P-MJ72AA uses a 100 mm frame, corresponding to Frame 3 in the product configuration.

Its magnetic stack length is 50.8 mm.

Dimension Parameter	Specification
Model	MPL-B320P-MJ72AA
Frame Size	100 mm
Frame Designation	3
Magnetic Stack Length	50.8 mm
Stack Designation	20
Mounting Style	IEC metric flange
Mounting Hole Type	Free mounting holes, Type FF
Shaft Type	Keyed
Connector Type	SpeedTEC DIN
Connector Style	Right-angle
Connector Rotation	180°
Overall Motor Diameter	Verify exact mechanical drawing
Overall Motor Length	Verify exact mechanical drawing
Shaft Length	Verify exact mechanical drawing
Shaft Projection	Verify exact mechanical drawing
Mounting Bolt Circle	Verify exact mechanical drawing
Exact Installation Envelope	Verify mechanical drawing
Approximate Weight	4.5 kg

The 100 mm frame and 50.8 mm stack are the principal catalog dimensions.

For machine fabrication, however, the complete mechanical drawing should be used to determine the exact motor envelope.

This is particularly important around the shaft, mounting flange, connector, and rear motor housing.

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17. Weight

The MPL-B320P motor family has a reference weight of approximately 4.5 kg for the B320P configuration.

Weight Parameter	Value
Model	MPL-B320P-MJ72AA
Approximate Motor Weight	4.5 kg
Weight Unit	kg
Motor Family Weight Reference	Approximately 4.5 kg
Shipping Weight	May be higher
Packaging Weight	Not included in motor mass
Installation Design Weight	Use actual unit or applicable drawing

The actual shipping weight may be different because packaging, accessories, cables, and other materials are not necessarily included in the motor’s catalog mass.

For machine structural calculations, the motor mass should be confirmed against the actual unit and applicable mechanical documentation.

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18. Rotor Inertia

The rotor inertia is approximately:

0.000078 kg·m²

or:

7.8 × 10⁻⁵ kg·m²

Rotor inertia is important when calculating the dynamic response of a servo axis.

A low rotor inertia allows the motor to accelerate and decelerate its own rotating mass rapidly.

However, the actual response of the complete machine depends on the ratio between motor inertia and reflected load inertia.

For example, a relatively low-inertia motor connected to a very large mechanical load may still require substantial torque during acceleration.

Therefore, motor inertia should always be evaluated together with load inertia and transmission ratio.

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19. Electrical Characteristics

Electrical Parameter	Specification
Model	MPL-B320P-MJ72AA
Voltage Class	460 V AC
Armature Voltage	460 V
Motor Type	Brushless AC servo
Continuous Power	1.5 kW
Continuous Torque	3.05 N·m
Peak Torque	7.91 N·m
Rated Speed	5000 RPM
Maximum Speed	5000 RPM
Feedback	Absolute multi-turn high-resolution
Encoder Signal	Sin/Cos
Encoder Resolution	1024 cycles/rev
Feedback Protocol	Hiperface
Brake	None
Connector	SpeedTEC DIN
Connector Orientation	Right-angle
Connector Rotation	180°

The motor is intended to operate as part of a compatible servo drive system rather than as a standalone conventional AC motor.

The servo drive controls motor current and voltage according to the required motion profile while receiving feedback from the motor encoder.

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20. Mechanical Characteristics

Mechanical Parameter	Specification
Model	MPL-B320P-MJ72AA
Frame	100 mm
Magnetic Stack	50.8 mm
Shaft	Keyed
Shaft Seal	None
Mounting	IEC metric flange
Mounting Holes	Free mounting holes, Type FF
Brake	No integral brake
Connector	Right-angle SpeedTEC DIN
Connector Rotation	180°
Rotor Inertia	0.000078 kg·m²
Approximate Weight	4.5 kg
Overall Dimensions	Verify exact mechanical drawing
Shaft Projection	Verify exact mechanical drawing
Mounting Dimensions	Verify exact mechanical drawing

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21. Typical Applications

Packaging Machinery

The MPL-B320P-MJ72AA is suitable for high-cycle packaging machinery where fast and repeatable motion is required.

Typical uses include indexing, product positioning, film feeding, cutting, sealing, labeling, and synchronization between multiple machine axes.

The 5000 RPM capability is useful for high-cycle machinery, while the absolute multi-turn encoder provides detailed shaft-position feedback.

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Material Handling

The motor can be applied to automated material-handling equipment requiring controlled rotary or linear movement.

Examples include conveyor positioning, transfer mechanisms, indexing tables, sorting equipment, and automated handling systems.

The keyed shaft is suitable for compatible pulley, coupling, and transmission arrangements.

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Assembly Equipment

Automated assembly machinery often requires precise positioning of components.

The MPL-B320P-MJ72AA can be used for actuator systems, indexing mechanisms, rotary positioning, component feeding, and other servo-controlled movements.

The absolute multi-turn feedback is particularly useful where the machine controller requires accurate position information across multiple motor revolutions.

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CNC and Machine Tools

Servo motors are widely used in machine tools for axis movement and positioning.

The MPL-B320P-MJ72AA can be considered for suitable auxiliary or positioning axes where the required torque, speed, feedback, and mechanical interface match the application.

The keyed shaft can be convenient for compatible mechanical transmissions.

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Pick-and-Place Systems

Pick-and-place equipment often requires rapid acceleration and deceleration.

The low-inertia motor design can help provide fast dynamic response when the motor is correctly matched to the load.

The absolute multi-turn feedback also supports applications where the controller requires accurate shaft-position information.

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Printing and Converting Machinery

Printing and converting systems can require coordinated rotary motion.

Servo motors can be used for feeding, registration, cutting, web handling, roller synchronization, and other controlled movements.

The high-speed rating and closed-loop feedback make the motor appropriate for many such motion-control applications.

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Automated Inspection Equipment

Inspection machinery often requires accurate positioning of cameras, workpieces, sensors, or fixtures.

The motor can be used for rotary positioning, indexing, or linear-axis motion through an appropriate mechanical transmission.

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Textile Machinery

Textile equipment can include high-speed synchronized axes for feeding, winding, cutting, and positioning.

The low-inertia motor design is suitable for applications with frequent speed changes and repeated machine cycles.

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22. Main Product Advantages

22.1 High-Speed 5000 RPM Operation

The 5000 RPM rating allows the motor to support rapid machine movement.

This can reduce cycle time in applications where motor speed is a limiting factor.

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22.2 Low-Inertia Construction

The low rotor inertia allows rapid changes in motor speed.

This is particularly useful for indexing and high-cycle motion applications.

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22.3 Absolute Multi-Turn Feedback

The absolute multi-turn encoder provides detailed position feedback over multiple shaft revolutions.

This is an important advantage for machines where accumulated shaft position is relevant to the machine’s operation.

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22.4 High-Resolution Feedback

The Sin/Cos feedback arrangement provides high-resolution feedback information for the servo control system.

This supports precise velocity and position regulation when used with a compatible drive and controller.

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22.5 Keyed Shaft

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

This can simplify mechanical integration when the existing machine uses keyed components.

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22.6 Compact 100 mm Frame

The 100 mm frame provides a useful balance between motor size and output capability.

It is suitable for many machine designs where available installation space is limited.

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22.7 No Brake Configuration

For horizontal axes and applications where a mechanical holding brake is unnecessary, the no-brake configuration can simplify the motor arrangement.

It also eliminates brake-related control wiring.

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22.8 Rotatable Connector

The 180° rotatable right-angle connector allows greater flexibility in cable routing.

This can be particularly useful in compact machine installations.

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23. Application Selection

The motor should be selected according to the actual machine motion profile.

Important selection factors include:

• Required continuous torque.
• Required peak torque.
• Maximum operating speed.
• Acceleration time.
• Deceleration time.
• Load inertia.
• Reflected load inertia.
• Duty cycle.
• Mechanical transmission ratio.
• Feedback requirements.
• Shaft interface.
• Brake requirements.
• Motor dimensions.
• Servo drive compatibility.

A motor should not be selected solely because its rated power matches the existing motor.

A complete servo sizing calculation should consider the actual load and motion profile.

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24. Five Related Models

The following models are closely related to the MPL-B320P-MJ72AA and are useful when comparing different feedback, shaft, or brake configurations.

Related Model	Voltage	Frame	Stack	Speed	Feedback	Shaft	Brake	Continuous Torque	Power	Approx. Weight
MPL-B320P-MJ74AA	460 V	100 mm	50.8 mm	5000 RPM	Multi-turn high-resolution absolute	Keyed	24 V DC	3.05 N·m	1.5 kW	Approx. 4.5 kg
MPL-B320P-MK72AA	460 V	100 mm	50.8 mm	5000 RPM	Multi-turn high-resolution absolute	Keyless	No	3.05 N·m	1.5 kW	Approx. 4.5 kg
MPL-B320P-MK74AA	460 V	100 mm	50.8 mm	5000 RPM	Multi-turn high-resolution absolute	Keyless	24 V DC	3.05 N·m	1.5 kW	Approx. 4.5 kg
MPL-B320P-HJ72AA	460 V	100 mm	50.8 mm	5000 RPM	2000-line incremental	Keyed	No	3.05 N·m	1.5 kW	Approx. 4.5 kg
MPL-B320P-SJ72AA	460 V	100 mm	50.8 mm	5000 RPM	Single-turn high-resolution	Keyed	No	Approx. 3.05 N·m	1.5 kW	Verify exact unit

These models are closely related because they retain the B320P motor platform while changing feedback, shaft, or brake configuration.

The MPL-B320P-MJ74AA is especially close because it retains the same multi-turn high-resolution feedback and keyed shaft while adding an integral 24 V DC brake.

The MPL-B320P-MK72AA retains the same multi-turn feedback but changes the shaft from keyed to keyless.

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25. Same-Series Comparison

Model	Feedback	Shaft	Brake	Speed	Frame	Stack	Continuous Torque	Power	Weight
MPL-B320P-MJ72AA	Multi-turn high-resolution absolute	Keyed	No	5000 RPM	100 mm	50.8 mm	3.05 N·m	1.5 kW	Approx. 4.5 kg
MPL-B320P-MJ74AA	Multi-turn high-resolution absolute	Keyed	24 V DC	5000 RPM	100 mm	50.8 mm	3.05 N·m	1.5 kW	Approx. 4.5 kg
MPL-B320P-MK72AA	Multi-turn high-resolution absolute	Keyless	No	5000 RPM	100 mm	50.8 mm	3.05 N·m	1.5 kW	Approx. 4.5 kg
MPL-B320P-MK74AA	Multi-turn high-resolution absolute	Keyless	24 V DC	5000 RPM	100 mm	50.8 mm	3.05 N·m	1.5 kW	Approx. 4.5 kg
MPL-B320P-HJ72AA	2000-line incremental	Keyed	No	5000 RPM	100 mm	50.8 mm	3.05 N·m	1.5 kW	Approx. 4.5 kg
MPL-B320P-HJ74AA	2000-line incremental	Keyed	24 V DC	5000 RPM	100 mm	50.8 mm	3.05 N·m	1.5 kW	Approx. 4.5 kg

The MJ72AA should be distinguished from the HK72AA-type configuration primarily by feedback and shaft arrangement.

The MJ72AA uses multi-turn high-resolution absolute feedback and a keyed shaft.

The HK72AA uses incremental feedback and a keyless shaft.

These are not merely cosmetic differences. The feedback system and shaft interface can directly affect electrical compatibility, controller configuration, mechanical coupling, and commissioning procedures.

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26. Five Popular or Common Allen-Bradley Servo Models

The following models provide useful comparison points within the broader Allen-Bradley servo motor range.

Model	Series	Frame / Size	Speed	Continuous Torque	Power	Feedback	Shaft	Brake	Approx. Weight
MPL-B320P-HK72AA	MPL Low-Inertia	100 mm	5000 RPM	3.05 N·m	1.5 kW	2000-line incremental	Keyless	No	Approx. 4.5 kg
MPL-B320P-HK74AA	MPL Low-Inertia	100 mm	5000 RPM	3.05 N·m	1.5 kW	2000-line incremental	Keyless	24 V DC	Approx. 4.5 kg
MPL-B330P-MJ72AA	MPL Low-Inertia	100 mm class	5000 RPM	4.18 N·m	1.8 kW	Multi-turn high-resolution	Keyed	No	Approx. 6.1 kg
MPL-B420P-MK74AA	MPL Low-Inertia	Larger frame class	5000 RPM	4.74 N·m	1.9 kW	Multi-turn high-resolution	Keyless	24 V DC	Approx. 6.4 kg
MPL-B430P-MJ72AA	MPL Low-Inertia	Larger frame class	5000 RPM	6.55 N·m	2.2 kW	Multi-turn high-resolution	Keyed	No	Approx. 9.2 kg

The B320P, B330P, B420P, and B430P configurations represent different motor capacity levels within the MPL family.

The published MPL family data places the B320P at approximately 3.05 N·m continuous torque and 1.5 kW, the B330P at approximately 4.18 N·m and 1.8 kW, the B420P at approximately 4.74 N·m and 1.9 kW, and the B430P at approximately 6.55 N·m and 2.2 kW.

These models should be selected according to the actual motion requirements rather than simply choosing the model with the highest power.

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27. Same-Brand Model Comparison

Model	Speed	Power	Continuous Torque	Peak Torque	Feedback	Shaft	Brake	Frame / Size	Weight
MPL-B320P-MJ72AA	5000 RPM	1.5 kW	3.05 N·m	7.91 N·m	Multi-turn absolute	Keyed	No	100 mm	Approx. 4.5 kg
MPL-B320P-HK72AA	5000 RPM	1.5 kW	3.05 N·m	7.91 N·m	Incremental	Keyless	No	100 mm	Approx. 4.5 kg
MPL-B320P-HK74AA	5000 RPM	1.5 kW	3.05 N·m	7.91 N·m	Incremental	Keyless	24 V DC	100 mm	Approx. 4.5 kg
MPL-B330P-MJ72AA	5000 RPM	1.8 kW	4.18 N·m	11.1 N·m	Multi-turn absolute	Keyed	No	Larger B330P class	Approx. 6.1 kg
MPL-B420P-MK74AA	5000 RPM	1.9 kW	4.74 N·m	13.5 N·m	Multi-turn absolute	Keyless	24 V DC	Larger B420P class	Approx. 6.4 kg

This comparison shows that the MPL-B320P-MJ72AA occupies a relatively compact position within the MPL low-inertia family.

The B330P and B420P configurations provide greater torque capability, but they also increase motor size and mass.

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28. Installation Considerations

Correct mechanical installation is essential for reliable servo motor operation.

The motor flange should be mounted to a rigid machine structure.

The motor shaft should be correctly aligned with the driven component.

Excessive angular or parallel misalignment can increase bearing loading and create vibration.

The keyed shaft must be matched with a compatible coupling or transmission component.

The key should be correctly fitted and the coupling should be installed according to the applicable mechanical requirements.

The motor connector should also have sufficient clearance.

Although the connector can rotate through 180 degrees, it should not be forced into an orientation that creates excessive cable bending or mechanical interference.

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29. Cable Routing

Servo motor cables should be routed so that they are protected from:

• Excessive bending.
• Crushing.
• Abrasion.
• Heat.
• Moving machine components.
• Sharp edges.
• Excessive tensile force.
• Repeated mechanical stress.

The right-angle connector provides additional flexibility, but proper cable routing remains important for long-term reliability.

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30. Servo Drive Compatibility

The MPL-B320P-MJ72AA is intended to operate as part of a compatible servo motion-control system.

The motor’s electrical characteristics, feedback technology, and connector arrangement must match the selected drive system.

Published configuration information associates MPL motors with several compatible servo drive families.

Because the MJ72AA uses an absolute multi-turn Hiperface feedback configuration, the drive must support the corresponding feedback interface and motor configuration.

A drive designed only for a different encoder technology should not be assumed to be compatible simply because the motor voltage and power ratings appear similar.

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31. Maintenance

The brushless motor design eliminates the routine brush replacement associated with brushed motors.

Maintenance should instead focus on mechanical condition, electrical connections, feedback performance, shaft alignment, and operating temperature.

Maintenance Item	Inspection Focus
Model	MPL-B320P-MJ72AA
Mounting	Check mounting bolts and flange
Shaft	Inspect shaft and coupling
Key	Check key and keyway condition
Bearings	Monitor noise, vibration, and temperature
Encoder	Check feedback stability
Connector	Inspect connector condition
Cable	Check for abrasion and bending
Cooling	Maintain adequate heat dissipation
Vibration	Check for abnormal vibration
Noise	Investigate unusual operating noise
Grounding	Check electrical grounding
Mechanical Alignment	Verify motor/load alignment

In high-cycle machinery, preventive inspection is especially important because small alignment or coupling problems can develop into larger mechanical failures.

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32. Replacement Considerations

When replacing an existing motor with the MPL-B320P-MJ72AA, the complete model configuration should be compared.

The following characteristics should be matched:

Replacement Parameter	MPL-B320P-MJ72AA
Model	MPL-B320P-MJ72AA
Voltage	460 V class
Speed	5000 RPM
Power	1.5 kW
Continuous Torque	3.05 N·m
Peak Torque	7.91 N·m
Frame	100 mm
Stack	50.8 mm
Feedback	Multi-turn high-resolution absolute
Feedback Protocol	Hiperface
Shaft	Keyed
Brake	No brake
Connector	SpeedTEC DIN
Mounting	IEC metric flange
Rotor Inertia	0.000078 kg·m²
Weight	Approx. 4.5 kg
Overall Dimensions	Verify exact drawing

A motor with the same 1.5 kW rating is not necessarily a direct replacement.

For example, changing from multi-turn absolute feedback to incremental feedback can require changes to drive configuration, controller setup, commissioning procedures, and feedback wiring.

Similarly, changing from a keyed shaft to a keyless shaft can require a different coupling.

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33. Key Differences from MPL-B320P-HK72AA

The MPL-B320P-MJ72AA and MPL-B320P-HK72AA have similar basic motor capacity but different feedback and shaft arrangements.

Parameter	MPL-B320P-MJ72AA	MPL-B320P-HK72AA
Voltage	460 V class	460 V class
Frame	100 mm	100 mm
Stack	50.8 mm	50.8 mm
Speed	5000 RPM	5000 RPM
Power	1.5 kW	1.5 kW
Continuous Torque	3.05 N·m	3.05 N·m
Peak Torque	7.91 N·m	7.91 N·m
Feedback	Multi-turn high-resolution absolute	2000-line incremental
Shaft	Keyed	Keyless
Brake	No	No
Connector	SpeedTEC DIN	SpeedTEC DIN
Rotor Inertia	Approx. 0.000078 kg·m²	Approx. 0.000078 kg·m²
Approx. Weight	4.5 kg	Approx. 4.5 kg

The two motors therefore have a similar mechanical and power platform but differ significantly in feedback and shaft configuration.

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34. Key Differences from MPL-B320P-MJ74AA

The MPL-B320P-MJ74AA is particularly close to the MJ72AA.

Parameter	MPL-B320P-MJ72AA	MPL-B320P-MJ74AA
Voltage	460 V class	460 V class
Frame	100 mm	100 mm
Stack	50.8 mm	50.8 mm
Speed	5000 RPM	5000 RPM
Power	1.5 kW	1.5 kW
Continuous Torque	3.05 N·m	3.05 N·m
Feedback	Multi-turn high-resolution absolute	Multi-turn high-resolution absolute
Shaft	Keyed	Keyed
Brake	No	24 V DC
Connector	SpeedTEC DIN	SpeedTEC DIN
Approx. Weight	4.5 kg	Approx. 4.5 kg

The major difference is the brake.

If a machine requires mechanical holding of a vertical axis, the brake-equipped configuration may be more appropriate, provided the drive and machine control system support it.

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35. Practical Application Advantages

The MPL-B320P-MJ72AA combines a compact mechanical form with relatively high rotational speed.

Its 100 mm frame allows it to be integrated into many machine designs without requiring the physical size associated with larger servo motors.

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

The 5000 RPM rating provides high rotational capability.

The multi-turn absolute encoder provides feedback suitable for applications where position information over multiple revolutions is important.

The keyed shaft supports conventional mechanical transmission arrangements.

The absence of an integral brake makes the motor configuration relatively straightforward for applications that do not require mechanical shaft holding.

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36. Engineering Considerations for Vertical Axes

The no-brake configuration requires special consideration when used on vertical axes.

When the servo is disabled, the motor does not provide a mechanical holding brake.

If gravity can cause the load to move, the machine must incorporate an appropriate mechanical holding solution.

Possible engineering approaches may include a brake-equipped servo motor, external mechanical brake, counterbalance system, or another properly designed holding mechanism.

The appropriate solution depends on the machine’s safety requirements and load characteristics.

The servo motor’s electromagnetic torque should not be relied upon as the sole means of holding a gravity-loaded axis when the machine is in an unpowered condition.

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37. Servo Tuning and Dynamic Performance

The low-inertia design makes the motor suitable for applications with frequent speed changes.

However, the best servo performance depends on the entire mechanical system.

Important factors include:

• Motor inertia.
• Load inertia.
• Gear ratio.
• Coupling stiffness.
• Belt elasticity.
• Screw stiffness.
• Backlash.
• Friction.
• Resonance.
• Acceleration requirements.
• Deceleration requirements.
• Controller gains.

A motor with excellent dynamic characteristics can still perform poorly if the machine has excessive mechanical compliance or an unsuitable inertia ratio.

Correct servo tuning should therefore be performed after the motor and mechanical load are installed.

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38. Recommended Application Areas

The MPL-B320P-MJ72AA is particularly suitable for:

Application	Typical Servo Function
Packaging Machines	Indexing, feeding, cutting, positioning
Assembly Machines	Component positioning and motion
Material Handling	Conveyor and transfer positioning
Pick-and-Place Equipment	Rapid axis movement
CNC Equipment	Position-controlled machine axes
Printing Machinery	Registration and synchronized movement
Converting Machinery	Feeding, cutting, web handling
Inspection Machines	Rotary and linear positioning
Textile Equipment	Feeding and synchronized motion
Automation Machinery	General closed-loop motion control

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39. Product Advantages at a Glance

Advantage	Description
High-Speed Operation	5000 RPM rated speed
Low Inertia	Fast response to speed and position commands
Absolute Feedback	Multi-turn position feedback
High Resolution	Sin/Cos 1024 cycles/revolution
Keyed Shaft	Conventional mechanical transmission interface
Compact Frame	100 mm frame size
Useful Power Class	1.5 kW continuous
High Peak Torque	Approximately 7.91 N·m
Flexible Connector	180° rotatable right-angle DIN connector
No Brake	Suitable for applications that do not require integral holding brake
Metric Mounting	IEC metric flange
Industrial Servo Design	Intended for closed-loop motion applications

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40. Final Technical Summary

Category	Specification
Model	MPL-B320P-MJ72AA
Brand	Allen-Bradley
Series	MP-Series MPL
Product Type	Low-Inertia Brushless AC Rotary Servo Motor
Voltage Class	460 V AC
Armature Voltage	460 V
Rated Speed	5000 RPM
Maximum Speed	5000 RPM
Continuous Torque	3.05 N·m
Peak Torque	7.91 N·m
Rated Power	1.5 kW
Frame Size	100 mm
Frame Designation	3
Magnetic Stack	50.8 mm
Stack Designation	20
Feedback	Multi-turn high-resolution absolute encoder
Encoder Resolution	Sin/Cos, 1024 cycles/rev
Feedback Protocol	Hiperface
Shaft	Keyed
Brake	No integral brake
Connector	SpeedTEC DIN
Connector Style	Right-angle
Connector Rotation	180°
Mounting	IEC metric flange
Rotor Inertia	0.000078 kg·m²
Shaft Seal	None
Approximate Weight	4.5 kg
Frame Dimension	100 mm
Stack Dimension	50.8 mm
Overall Dimensions	Verify exact mechanical drawing
Application	Industrial closed-loop motion control

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41. Final Product Description

The Allen-Bradley MPL-B320P-MJ72AA is a 460 V-class, 5000 RPM low-inertia brushless AC rotary servo motor designed for demanding industrial motion-control applications.

It combines approximately 1.5 kW continuous power, 3.05 N·m continuous torque, and 7.91 N·m peak torque with a compact 100 mm frame and 50.8 mm magnetic stack.

Its most distinctive feature is the multi-turn high-resolution absolute encoder.

The encoder provides high-resolution feedback through a Sin/Cos signal arrangement and Hiperface protocol, making the motor suitable for motion systems where accurate multi-turn position information is required.

The motor also uses a keyed shaft extension, making it suitable for compatible keyed mechanical couplings and transmission systems.

The SpeedTEC DIN right-angle connector can be rotated through 180 degrees, giving machine designers additional flexibility when routing motor cables.

The motor has no integral brake, which makes it appropriate for applications where a holding brake is unnecessary. For vertical or gravity-loaded axes, the absence of a brake must be considered carefully and an appropriate holding method should be incorporated when required.

The 100 mm frame, 50.8 mm stack, 5000 RPM speed, 1.5 kW power rating, 3.05 N·m continuous torque, 7.91 N·m peak torque, multi-turn absolute encoder, keyed shaft, and no-brake configuration define the principal characteristics of this model.

The MPL-B320P-MJ72AA is well suited to packaging equipment, automated assembly systems, material handling, pick-and-place machinery, machine tools, printing and converting equipment, inspection machines, textile machinery, and other automated systems requiring accurate high-speed servo motion.

For replacement applications, the most important point is to match not only the motor’s power and dimensions but also its feedback type, encoder interface, shaft arrangement, connector configuration, and brake option.

In practical engineering terms, the MPL-B320P-MJ72AA is a compact, high-speed, low-inertia servo motor configuration intended for machines that require accurate multi-turn absolute feedback, rapid dynamic response, and a conventional keyed mechanical shaft connection.