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Allen-Bradley MPL-B320P-MK72AA Servo Motor – Detailed Specifications, Applications, Advantages and Related Models

1. Product Introduction

The Allen-Bradley MPL-B320P-MK72AA is a high-speed, low-inertia AC rotary servo motor designed for precision motion-control applications. It belongs to the MP-Series MPL family of low-inertia brushless servo motors and is configured for 460 V-class industrial servo systems. The motor combines a 100 mm frame, 50.8 mm magnetic stack, 5000 RPM operating speed, multi-turn high-resolution absolute feedback, a keyless shaft, and a no-brake configuration.

The MPL-B320P-MK72AA is particularly suited to machinery that requires fast acceleration, rapid deceleration, accurate positioning, and repeated motion cycles. Its low rotor inertia allows the motor to respond quickly to changes commanded by the servo drive.

The model is also designed around a compact industrial motor format. Its 100 mm frame and 50.8 mm magnet stack provide a useful balance between motor size, torque capability, speed, and dynamic response.

Unlike the keyed version of the same motor family, the MK72AA uses a keyless shaft extension. This configuration can be useful where the mechanical transmission system uses a suitable clamping hub, shrink disc, precision coupling, or other keyless mechanical connection.

The motor also does not include an integral brake. This makes the MK72AA configuration particularly appropriate for horizontal-axis applications or machines where the mechanical system does not require an integrated holding brake.

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2. Basic Product Parameters

Parameter	Specification
Model	MPL-B320P-MK72AA
Brand	Allen-Bradley
Product Type	AC Rotary Servo Motor
Series	MP-Series MPL Low-Inertia Servo Motor
Motor Type	Brushless Permanent-Magnet Servo Motor
Voltage Class	460 V AC class
Product Supply Rating	480 V AC
Rated Power	1.5 kW
Rated Speed	5000 RPM
Maximum Speed	5000 RPM
Continuous Torque	3.05 N·m
Peak Torque	7.91 N·m
Frame Size	100 mm
Magnet Stack Length	50.8 mm
Feedback	Multi-turn High-Resolution Absolute Encoder
Feedback Resolution	1024 Sin/Cos cycles/rev
Feedback Protocol	Hiperface
Shaft Type	Keyless Shaft Extension
Shaft Seal	No Shaft Seal
Brake	No Integral Brake
Connector	SpeedTEC DIN
Connector Orientation	Right-angle, 180° rotatable
Mounting	IEC Metric Flange
Mounting Holes	Free Mounting Holes, Type FF
Rotor Inertia	Approx. 0.000078 kg·m²
Operating Temperature	Up to approximately 40 °C
Approx. Dimensions	42.799 × 21.692 × 26.01 cm
Approx. Weight	3.71 kg

The principal catalog data identifies this model as a 5000 RPM, 1.5 kW servo motor with 3.05 N·m continuous torque, 7.91 N·m peak torque, 100 mm frame size, 50.8 mm stack length, multi-turn absolute feedback, keyless shaft, and no brake.

The listed physical weight for the MK72AA configuration is approximately 3.71 kg. Dimensions are presented as an overall envelope reference and should be checked against the applicable mechanical drawing when exact installation clearances are required.

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3. Brand

Brand: Allen-Bradley

Allen-Bradley is widely associated with industrial automation, motion control, motor control, servo systems, PLC systems, drives, and machine-control equipment.

The MPL-B320P-MK72AA carries the Allen-Bradley product designation and belongs to the MP-Series family of servo motors.

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4. Product Series

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

The MPL family is designed around low-inertia servo motor construction. The basic idea is to provide a motor rotor that can accelerate and decelerate rapidly, allowing the complete servo system to respond quickly to position, speed, and torque commands.

The MPL-B320P-MK72AA belongs to the 460 V class of MPL motors and uses the B320P motor configuration. The “320” portion identifies the particular frame and stack combination, while the remaining model characters describe speed, feedback, shaft, connector, and brake configuration.

The B320P family is rated for 5000 RPM and approximately 1.5 kW continuous output, with approximately 3.05 N·m continuous torque and 7.91 N·m peak torque.

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5. Model Number Explanation

The model number can be understood as a configuration code rather than simply a product name.

Model Code	Meaning
MPL	Low-inertia brushless servo motor family
B	460 V-class motor family
3	100 mm frame size
20	50.8 mm magnet stack
P	5000 RPM speed class
M	Multi-turn high-resolution absolute encoder
K	Keyless shaft extension
7	SpeedTEC DIN right-angle connector, 180° rotatable
2	No integral brake
AA	Standard catalog configuration

This coding structure makes the MK72AA configuration easy to distinguish from nearby models.

For example, an MJ72AA version uses a keyed shaft instead of the keyless shaft, while an MK74AA version retains the keyless shaft but adds a 24 V DC brake.

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6. Motor Performance

The MPL-B320P-MK72AA is rated at approximately 1.5 kW continuous output power.

The 5000 RPM speed rating is one of the major characteristics of the B320P configuration. The motor is intended for applications where relatively high rotational speed is required together with accurate servo positioning.

The continuous torque is approximately 3.05 N·m, while the peak torque capability is approximately 7.91 N·m.

Performance Parameter	Value
Model	MPL-B320P-MK72AA
Rated Power	1.5 kW
Rated Speed	5000 RPM
Maximum Motor Speed	5000 RPM
Continuous Torque	3.05 N·m
Peak Torque	7.91 N·m
Rotor Inertia	0.000078 kg·m²
Frame Size	100 mm
Stack Length	50.8 mm
Weight	3.71 kg
Dimensions	42.799 × 21.692 × 26.01 cm

The combination of relatively low rotor inertia and high operating speed makes the motor suitable for repetitive indexing, rapid positioning, and other dynamic motion profiles.

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7. Low-Inertia Motor Design

Low rotor inertia is one of the most important features of the MPL-B320P-MK72AA.

Rotor inertia determines how readily the rotating assembly responds to a change in torque. A lower inertia allows the servo drive to accelerate and decelerate the motor more rapidly, assuming the machine load and tuning are suitable.

The rotor inertia for this motor is approximately 7.8 × 10⁻⁵ kg·m².

This characteristic is particularly useful when the application requires frequent changes in direction or speed.

Typical examples include indexing mechanisms, pick-and-place systems, electronic assembly machinery, packaging equipment, cutting machinery, and other automated production systems.

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8. Multi-Turn High-Resolution Absolute Encoder

The MPL-B320P-MK72AA uses a multi-turn high-resolution absolute encoder.

The feedback system provides information about motor position to the servo control system. Multi-turn feedback is especially useful when the application requires position information across multiple rotations of the motor shaft.

The encoder configuration is based on Sin/Cos feedback with approximately 1024 cycles per revolution and Hiperface communication.

Feedback Parameter	Specification
Model	MPL-B320P-MK72AA
Feedback Type	Absolute Multi-Turn
Resolution	1024 Sin/Cos cycles/rev
Protocol	Hiperface
Feedback Category	High-resolution absolute feedback
Position Information	Single-turn and multi-turn position information
Weight	3.71 kg
Dimensions	42.799 × 21.692 × 26.01 cm

The multi-turn configuration can reduce the need for the machine to establish its position from zero every time power is restored, depending on the complete control architecture and commissioning configuration.

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9. Keyless Shaft Configuration

One of the defining characteristics of the MPL-B320P-MK72AA is its keyless shaft.

The shaft does not use a traditional mechanical keyway. Instead, the machine designer normally uses a compatible precision coupling, clamping hub, or other suitable keyless connection method.

This configuration can provide a clean mechanical connection when the transmission system is designed around clamping technology.

The keyless configuration can also be useful where the machine builder wants to avoid the mechanical clearance associated with conventional keyed couplings.

However, the selected coupling must be correctly sized for the motor torque, speed, acceleration, radial load, axial load, and application duty.

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10. No Integral Brake

The MK72AA configuration does not include an integral motor brake.

This is an important distinction when comparing it with models such as MK74AA or MJ74AA.

A brake is often used to hold a vertical axis or prevent unwanted movement after servo power has been removed. The MK72AA does not provide that integral brake function.

For horizontal applications where gravity does not create a significant holding requirement, a no-brake motor can be a practical configuration.

For vertical axes, suspended loads, or applications requiring positive holding during shutdown, the machine design must provide an appropriate external or integrated holding solution.

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11. SpeedTEC DIN Connector

The motor uses a SpeedTEC DIN connector configuration.

The connector is a right-angle style and can be rotated through approximately 180 degrees during installation.

This can be valuable in compact machine designs because cable direction can be adjusted to suit the available space.

Connector Parameter	Specification
Model	MPL-B320P-MK72AA
Connector Type	SpeedTEC DIN
Connector Style	Right Angle
Rotation	180° rotatable
Motor Feedback	Encoder connection
Motor Power	Servo motor connection
Brake Connection	Not applicable to this no-brake version
Weight	3.71 kg
Dimensions	42.799 × 21.692 × 26.01 cm

The connector should be positioned carefully during installation. Excessive mechanical force or unnecessary repeated rotation should be avoided.

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12. Mechanical Dimensions

The overall dimensions are approximately:

• Length: 42.799 cm
• Width: 21.692 cm
• Height: 26.01 cm

These figures represent the overall product envelope rather than every individual mounting dimension.

For machine design, the actual mounting drawing should be used for bolt-hole locations, shaft geometry, connector clearance, and coupling dimensions.

Mechanical Parameter	Specification
Model	MPL-B320P-MK72AA
Frame Size	100 mm
Magnet Stack	50.8 mm
Overall Length	Approx. 42.799 cm
Overall Width	Approx. 21.692 cm
Overall Height	Approx. 26.01 cm
Mounting Type	IEC Metric Flange
Mounting Hole Style	Free Mounting Holes, Type FF
Shaft	Keyless
Shaft Seal	No Shaft Seal
Connector	Right-angle SpeedTEC DIN
Weight	Approx. 3.71 kg

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13. Electrical Parameters

Electrical Parameter	Specification
Model	MPL-B320P-MK72AA
Voltage Class	460 V AC
Product Supply Rating	480 V AC
Rated Power	1.5 kW
Rated Speed	5000 RPM
Continuous Torque	3.05 N·m
Peak Torque	7.91 N·m
Motor Type	Brushless AC Servo
Number of Phases	3-phase system
Feedback	Multi-turn Absolute Encoder
Feedback Protocol	Hiperface
Brake	None
Rotor Inertia	0.000078 kg·m²
Weight	3.71 kg
Dimensions	42.799 × 21.692 × 26.01 cm

The motor is intended to operate as part of a compatible servo-drive and motion-control system rather than as a conventional stand-alone induction motor.

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14. Typical Applications

The MPL-B320P-MK72AA can be used in a wide variety of industrial motion-control applications.

Packaging Machinery

Packaging equipment often requires repeated acceleration, deceleration, indexing, and synchronization.

The 5000 RPM capability and low-inertia construction make this type of servo motor suitable for mechanisms such as indexing stations, feeders, rotary positioning systems, film handling systems, and synchronized packaging axes.

Conveyor Positioning

The motor can also be used for servo-controlled conveyors where precise position or speed control is required.

Instead of simply running at a fixed speed, the servo system can control acceleration, deceleration, position, and synchronization with other machine axes.

Pick-and-Place Equipment

Pick-and-place machines benefit from fast motion and repeatable positioning.

The low rotor inertia allows the motor to respond quickly to commanded speed changes, while the absolute multi-turn feedback provides accurate position information to the motion-control system.

Assembly Machinery

Automated assembly systems frequently require controlled rotary movement.

The motor can be used for indexing tables, screw-driving mechanisms, transfer systems, rotary actuators, and other machine axes.

Printing Machinery

Printing equipment can require coordinated motion between rollers, feeders, cutters, and other rotating components.

Servo motors can provide the speed synchronization and position control required for these applications.

Machine Tools

The motor can be used for selected machine-tool auxiliary axes, indexing systems, positioning mechanisms, and other high-speed servo applications.

The exact suitability depends on torque demand, duty cycle, mechanical load, and required acceleration.

Material Handling

Material-handling equipment may use servo motors for controlled positioning, sorting, indexing, and transfer mechanisms.

The absence of an integral brake makes the MK72AA especially appropriate where a holding brake is not required by the mechanical design.

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15. Main Product Advantages

High-Speed Operation

The 5000 RPM rating allows the motor to support high-speed machine movements.

This is useful when a machine needs short cycle times and rapid rotary motion.

Low Rotor Inertia

The low-inertia construction improves dynamic response.

A low-inertia motor can change speed rapidly, which is particularly useful for repetitive indexing and positioning.

High-Resolution Absolute Feedback

The multi-turn absolute encoder provides detailed position feedback for the motion-control system.

This can simplify machine positioning and improve repeatability when properly integrated with the controller and drive.

Compact 100 mm Frame

The 100 mm frame provides a relatively compact mechanical package for a 1.5 kW, 5000 RPM servo motor.

This is useful where cabinet or machine-space limitations are important.

Keyless Shaft

The keyless shaft allows the motor to be integrated with compatible clamping-type mechanical transmission components.

This can be advantageous for applications using precision couplings and compact mechanical assemblies.

No-Brake Configuration

The absence of a brake reduces the motor configuration to the essential drive components needed for applications that do not require a holding brake.

This is particularly useful for horizontal-axis machinery.

Flexible Connector Orientation

The 180-degree rotatable right-angle connector allows greater flexibility during machine installation.

This can simplify cable routing in compact equipment.

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16. Advantages of the MK72AA Configuration

The MK72AA should not simply be considered a smaller variation of a brake-equipped motor.

Its configuration is specifically defined by the combination of:

• 5000 RPM operation
• 1.5 kW output
• 3.05 N·m continuous torque
• 7.91 N·m peak torque
• Multi-turn absolute feedback
• Keyless shaft
• No integral brake
• 100 mm frame
• 50.8 mm stack
• SpeedTEC DIN connector

This combination makes the model useful where the machine requires fast servo motion but does not need a motor-mounted holding brake.

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17. Installation Considerations

Correct mechanical installation is important for obtaining the expected performance from a servo motor.

The motor should be mounted on a rigid machine structure capable of handling the reaction torque and dynamic forces generated during acceleration and deceleration.

The coupling should be accurately aligned with the driven shaft.

Misalignment can introduce excessive radial or axial forces and may reduce bearing life.

The keyless shaft should be connected using a suitable coupling or clamping mechanism designed for the motor’s operating speed and torque.

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18. Cable Routing

Servo motor power and feedback cables should be routed carefully.

Power cables should be separated from sensitive signal wiring where practical.

Sharp bends, excessive cable tension, unnecessary loops, and mechanical abrasion should be avoided.

The connector orientation can be adjusted to support cleaner cable routing, but the connector should not be repeatedly rotated without a specific installation reason.

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19. Servo Tuning

Servo tuning is another important part of the installation.

The motor itself provides the mechanical capability, but final machine performance depends on the complete system.

The servo drive, motor, load inertia, mechanical transmission, coupling stiffness, friction, acceleration profile, and control-loop settings all influence the final response.

For high-speed applications, tuning should be performed with attention to vibration, overshoot, following error, settling time, and mechanical resonance.

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20. Maintenance

Servo motors generally require less routine mechanical maintenance than many traditional mechanical drive systems, but inspection is still important.

The motor should be checked for abnormal vibration, unusual noise, excessive temperature, cable damage, connector problems, and mechanical coupling issues.

The driven load should also be inspected because many apparent motor problems originate from the machine-side transmission.

The keyless shaft connection should be checked according to the coupling manufacturer’s recommended inspection and torque requirements.

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21. Replacement Considerations

When replacing an existing servo motor with an MPL-B320P-MK72AA, the complete model number should be compared rather than matching only the basic MPL-B320P family.

The shaft type is particularly important.

The MK72AA has a keyless shaft, while MJ-series configurations may use a keyed shaft.

The brake configuration is also important.

The MK72AA has no integral brake, while a model ending in “74AA” may include a 24 V DC brake.

Feedback type should also be checked.

The “M” feedback designation identifies the multi-turn high-resolution absolute encoder configuration.

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22. Five Closely Related Models

The following models are closely related to the MPL-B320P-MK72AA and are useful for comparison when selecting a replacement or alternative configuration.

Model	Voltage Class	Frame	Stack	Speed	Power	Continuous Torque	Feedback	Shaft	Brake	Approx. Weight	Dimensions
MPL-B320P-MK72AA	460 V	100 mm	50.8 mm	5000 RPM	1.5 kW	3.05 N·m	Multi-turn absolute	Keyless	No	3.71 kg	42.799 × 21.692 × 26.01 cm
MPL-B320P-MJ72AA	460 V	100 mm	50.8 mm	5000 RPM	1.5 kW	3.05 N·m	Multi-turn absolute	Keyed	No	Verify exact unit	Same B320P envelope class
MPL-B320P-MK74AA	460 V	100 mm	50.8 mm	5000 RPM	1.5 kW	3.05 N·m	Multi-turn absolute	Keyless	24 V DC	Verify exact unit	Same B320P envelope class
MPL-B320P-HJ74AA	460 V	100 mm	50.8 mm	5000 RPM	1.5 kW	3.05 N·m	Incremental	Keyed	24 V DC	Verify exact unit	Same B320P envelope class
MPL-B320P-HK74AA	460 V	100 mm	50.8 mm	5000 RPM	1.5 kW	3.05 N·m	Incremental	Keyless	24 V DC	Verify exact unit	Same B320P envelope class

The most direct comparison is between the MK72AA and MK74AA because the shaft and feedback configuration remain similar while the brake configuration changes.

The MJ72AA is another close match because it retains the same motor performance characteristics but changes the shaft from keyless to keyed.

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23. Comparison of Related B320P Models

Feature	MPL-B320P-MK72AA	MPL-B320P-MJ72AA	MPL-B320P-MK74AA	MPL-B320P-HJ74AA	MPL-B320P-HK74AA
Frame	100 mm	100 mm	100 mm	100 mm	100 mm
Stack	50.8 mm	50.8 mm	50.8 mm	50.8 mm	50.8 mm
Speed	5000 RPM	5000 RPM	5000 RPM	5000 RPM	5000 RPM
Power	1.5 kW	1.5 kW	1.5 kW	1.5 kW	1.5 kW
Continuous Torque	3.05 N·m	3.05 N·m	3.05 N·m	3.05 N·m	3.05 N·m
Feedback	Multi-turn absolute	Multi-turn absolute	Multi-turn absolute	Incremental	Incremental
Shaft	Keyless	Keyed	Keyless	Keyed	Keyless
Brake	No	No	Yes	Yes	Yes
Rotor Inertia	0.000078 kg·m²	Approx. 0.000078 kg·m²	Approx. 0.000078 kg·m²	Approx. 0.000078 kg·m²	Approx. 0.000078 kg·m²
Weight	3.71 kg	Verify exact unit	Verify exact unit	Verify exact unit	Verify exact unit
Dimensions	42.799 × 21.692 × 26.01 cm	Same family envelope	Same family envelope	Same family envelope	Same family envelope

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24. Five Other Common Allen-Bradley Servo Motor Models

The following models represent other useful motor configurations within the same general servo-motor product family.

Model	Voltage Class	Frame / Class	Speed	Power	Continuous Torque	Feedback	Shaft	Brake	Approx. Weight	Dimensions
MPL-B310P-MJ74AA	460 V	100 mm class	5000 RPM	0.77 kW	1.58 N·m	Multi-turn absolute	Keyed	24 V DC	Verify exact unit	100 mm-frame family
MPL-B320P-HK74AA	460 V	100 mm	5000 RPM	1.5 kW	3.05 N·m	Incremental	Keyless	24 V DC	Verify exact unit	B320P family envelope
MPL-B330P-MK74AA	460 V	B330P class	5000 RPM	1.8 kW	4.18 N·m	Multi-turn absolute	Keyless	24 V DC	Verify exact unit	B330P family envelope
MPL-B420P-MJ74AA	460 V	B420P class	5000 RPM	1.9 kW	4.74 N·m	Multi-turn absolute	Keyed	24 V DC	Verify exact unit	B420P family envelope
MPL-B430P-MJ72AA	460 V	B430P class	5000 RPM	Approx. 2.2 kW	Approx. 6.55 N·m	Multi-turn absolute	Keyed	No	Verify exact unit	B430P family envelope

The exact weight and dimensional drawing should be verified for each alternative before a mechanical replacement is made. This is especially important because different frame and stack configurations can have different overall lengths even when their rated speeds are similar.

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25. MPL-B320P-MK72AA vs. MPL-B320P-MJ72AA

These two models are very close electrically.

Both are associated with the B320P 5000 RPM, 1.5 kW configuration.

The principal mechanical difference is the shaft.

The MK72AA uses a keyless shaft.

The MJ72AA uses a keyed shaft.

Parameter	MPL-B320P-MK72AA	MPL-B320P-MJ72AA
Power	1.5 kW	1.5 kW
Speed	5000 RPM	5000 RPM
Continuous Torque	3.05 N·m	3.05 N·m
Peak Torque	7.91 N·m	7.91 N·m
Feedback	Multi-turn absolute	Multi-turn absolute
Shaft	Keyless	Keyed
Brake	No	No
Frame	100 mm	100 mm
Stack	50.8 mm	50.8 mm
Weight	3.71 kg	Verify exact unit
Dimensions	42.799 × 21.692 × 26.01 cm	Same B320P family envelope

The correct choice therefore depends strongly on the mechanical coupling arrangement.

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26. MPL-B320P-MK72AA vs. MPL-B320P-MK74AA

The MK72AA and MK74AA are also closely related.

The main difference is the brake.

Parameter	MPL-B320P-MK72AA	MPL-B320P-MK74AA
Power	1.5 kW	1.5 kW
Speed	5000 RPM	5000 RPM
Continuous Torque	3.05 N·m	3.05 N·m
Feedback	Multi-turn absolute	Multi-turn absolute
Shaft	Keyless	Keyless
Brake	No	24 V DC
Frame	100 mm	100 mm
Stack	50.8 mm	50.8 mm
Rotor Inertia	0.000078 kg·m²	Approx. 0.000078 kg·m²
Weight	3.71 kg	Verify exact unit
Dimensions	42.799 × 21.692 × 26.01 cm	Same B320P family envelope

For applications requiring a motor-mounted holding brake, the MK74AA configuration should be considered instead of the MK72AA.

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27. MPL-B320P-MK72AA vs. MPL-B320P-HK74AA

The difference here involves both feedback and brake configuration.

The MK72AA uses multi-turn absolute feedback and no brake.

The HK74AA uses incremental feedback, keyless shaft construction, and a 24 V DC brake.

Parameter	MPL-B320P-MK72AA	MPL-B320P-HK74AA
Voltage Class	460 V	460 V
Power	1.5 kW	1.5 kW
Speed	5000 RPM	5000 RPM
Continuous Torque	3.05 N·m	3.05 N·m
Feedback	Multi-turn absolute	Incremental
Shaft	Keyless	Keyless
Brake	No	24 V DC
Frame	100 mm	100 mm
Stack	50.8 mm	50.8 mm
Weight	3.71 kg	Verify exact unit
Dimensions	42.799 × 21.692 × 26.01 cm	Same B320P family envelope

This comparison is important when selecting a replacement because feedback type and brake configuration must match the control system and machine design.

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28. Practical Applications by Machine Type

Machine Type	Typical Servo Function	Suitability of MPL-B320P-MK72AA
Packaging Machine	Indexing and synchronized rotary motion	High potential suitability
Pick-and-Place Machine	Rapid positioning	High potential suitability
Assembly Machine	Rotary positioning	High potential suitability
Conveyor System	Speed and position control	High potential suitability
Printing Equipment	Roller synchronization	High potential suitability
Labeling Machine	High-speed indexing	High potential suitability
Material Handling	Positioning and transfer	High potential suitability
Cutting Machine	Controlled rotary movement	Application dependent
Machine Tool	Auxiliary positioning axis	Application dependent
Inspection Equipment	Precision positioning	High potential suitability

Actual suitability depends on load inertia, required acceleration, duty cycle, mechanical transmission, environmental conditions, and servo-drive compatibility.

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29. Selection Advantages for Machine Builders

For machine builders, the MPL-B320P-MK72AA offers a useful combination of standardization and performance.

The 100 mm frame makes it relatively easy to integrate into machinery designed around standardized servo motor mounting dimensions.

The 5000 RPM speed rating supports compact transmission ratios and high-speed machine operation.

The absolute multi-turn encoder provides sophisticated position feedback.

The keyless shaft can simplify certain coupling arrangements.

The no-brake configuration keeps the motor package focused on applications where a mechanical holding brake is not required.

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30. Important Selection Points

Before purchasing or replacing this motor, several points should be checked.

First, verify the voltage class.

The motor belongs to the 460 V class and is listed in current product information as a 480 V AC servo motor.

Second, verify the shaft configuration.

The MK72AA is keyless.

Third, verify the brake requirement.

The MK72AA has no integral brake.

Fourth, verify the feedback system.

The motor uses multi-turn absolute feedback.

Fifth, verify the mechanical dimensions.

The complete machine drawing should be checked before replacement.

Sixth, verify the servo drive.

The drive must support the motor’s voltage class, feedback system, current requirements, and motor configuration.

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31. Technical Summary

Category	Specification
Model	MPL-B320P-MK72AA
Brand	Allen-Bradley
Series	MP-Series MPL
Product	Low-Inertia Brushless AC Servo Motor
Voltage	460 V class / 480 V AC product rating
Power	1.5 kW
Speed	5000 RPM
Continuous Torque	3.05 N·m
Peak Torque	7.91 N·m
Frame	100 mm
Magnet Stack	50.8 mm
Feedback	Multi-turn High-Resolution Absolute
Encoder	1024 Sin/Cos, Hiperface
Shaft	Keyless
Brake	No Integral Brake
Connector	SpeedTEC DIN
Connector Orientation	Right-angle, 180° rotatable
Mounting	IEC Metric Flange
Rotor Inertia	0.000078 kg·m²
Shaft Seal	None
Dimensions	42.799 × 21.692 × 26.01 cm
Weight	3.71 kg
Primary Application	High-speed precision motion control

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32. Final Product Description

The Allen-Bradley MPL-B320P-MK72AA is a 1.5 kW, 5000 RPM low-inertia AC servo motor designed for high-speed and precision motion-control applications.

Its 100 mm frame and 50.8 mm magnetic stack provide a compact industrial motor package, while the low rotor inertia supports rapid acceleration and deceleration.

The multi-turn high-resolution absolute encoder provides advanced feedback for servo positioning and motion synchronization.

The keyless shaft distinguishes the MK72AA from keyed-shaft versions in the same family.

The absence of an integral brake makes the motor especially suitable for machine axes where a holding brake is not required.

The SpeedTEC DIN right-angle connector, with its flexible orientation, also helps simplify motor installation and cable routing in compact machinery.

With approximately 1.5 kW output, 5000 RPM speed, 3.05 N·m continuous torque, 7.91 N·m peak torque, 100 mm frame size, 50.8 mm stack length, 0.000078 kg·m² rotor inertia, approximately 3.71 kg weight, and an overall envelope of approximately 42.799 × 21.692 × 26.01 cm, the MPL-B320P-MK72AA represents a compact high-speed servo configuration for industrial automation and precision motion systems.

For replacement work, the complete model number should always be matched because apparently similar MPL motors can differ in voltage class, feedback type, shaft style, brake configuration, stack length, and mechanical dimensions.