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Allen-Bradley MPL-B310P-SK72AA Servo Motor

1. Product Introduction

The Allen-Bradley MPL-B310P-SK72AA is a low-inertia brushless AC rotary servo motor designed for industrial motion-control systems that require fast response, accurate positioning, repeatable movement, and stable speed control.

This model belongs to the MP-Series MPL low-inertia servo motor family and is configured for the 460 V AC class. It uses a 100 mm frame, 25.4 mm magnet stack, 5000 rpm speed rating, single-turn high-resolution encoder, keyless shaft extension, and no holding brake.

The MPL-B310P-SK72AA is particularly suitable for machines with frequent acceleration and deceleration. Its low-inertia construction allows the motor to respond quickly to changes in the commanded speed and position.

Compared with the closely related keyed-shaft version, this model uses a keyless shaft. This makes the shaft configuration an important consideration when selecting a replacement motor or designing a new machine.

The motor also uses a right-angle SpeedTEC DIN connector with 180-degree rotation capability. This provides additional flexibility when the motor is installed in a compact machine where cable routing and rear clearance are important.

Another important characteristic is the absence of a brake. The SK72AA configuration is therefore intended for applications where a separate holding brake is not required as part of the motor configuration.

2. Basic Product Parameters

Parameter	Specification
Model	MPL-B310P-SK72AA
Brand	Allen-Bradley
Product Family	MP-Series
Product Series	MPL Low-Inertia Servo Motors
Product Type	Brushless AC Rotary Servo Motor
Voltage Class	460 V AC
Frame Size	3 / 100 mm
Magnet Stack Length	10 / 25.4 mm
Rated Speed	5000 rpm
Continuous Torque	Approximately 1.58 Nm
Peak Torque	Approximately 3.61 Nm
Continuous Power	Approximately 0.77 kW
Feedback	Single-turn high-resolution encoder
Feedback Resolution	1024 Sin/Cos cycles per revolution
Feedback Protocol	Hiperface
Shaft	Keyless shaft extension
Shaft Seal	No shaft seal
Brake	No brake
Connector	SpeedTEC DIN connector
Connector Type	Right-angle
Connector Rotation	180° rotatable
Mounting	IEC metric
Mounting Holes	Free mounting holes / Type FF
Frame Dimension	100 mm
Magnet Stack Dimension	25.4 mm
Approximate Weight	2.68 kg
Operating Speed	5000 rpm

The exact product configuration identifies the motor as a 460 V, 100 mm frame, 25.4 mm stack, 5000 rpm, single-turn high-resolution encoder motor with a keyless shaft and no brake.

3. Brand

Brand: Allen-Bradley

Allen-Bradley is the brand associated with the MPL-B310P-SK72AA servo motor.

The model is intended for industrial automation and motion-control applications where a servo motor works together with an appropriate servo drive, feedback interface, mechanical transmission, and machine controller.

For equipment identification and replacement work, the complete catalog number is important because small changes in the model code can represent differences in shaft design, feedback configuration, brake configuration, frame size, or motor stack.

4. Product Series

Series: MP-Series MPL Low-Inertia Servo Motors

The MPL series is a family of brushless AC rotary servo motors designed around low-inertia motor construction.

Low motor inertia is useful in applications that require frequent changes in speed and position. When a machine repeatedly accelerates, stops, reverses, or indexes, motor inertia becomes an important part of the overall motion-system response.

The MPL-B310P-SK72AA belongs to the B310P configuration group, which uses a 100 mm frame, 25.4 mm magnet stack, and 5000 rpm configuration.

5. Detailed Technical Parameters

Parameter	Detailed Specification
Model	MPL-B310P-SK72AA
Motor Construction	Low-inertia brushless AC servo
Voltage	460 V AC
Voltage Class	400/460 V class
Frame Size	3
Frame Dimension	100 mm
Magnet Stack Code	10
Magnet Stack Dimension	25.4 mm
Speed Code	P
Rated Speed	5000 rpm
Feedback Code	S
Feedback Type	Single-turn high-resolution encoder
Feedback Resolution	1024 Sin/Cos cycles/rev
Feedback Protocol	Hiperface
Shaft Code	K
Shaft Type	Keyless shaft extension
Brake Code	2
Brake	No brake
Continuous Torque	Approximately 1.58 Nm
Peak Torque	Approximately 3.61 Nm
Continuous Power	Approximately 0.77 kW
Rotor Inertia	Approximately 4.4 × 10⁻⁵ kg·m²
Connector	SpeedTEC DIN
Connector Position	Right-angle
Connector Rotation	180°
Mounting	IEC metric
Mounting Hole Type	Free mounting holes / Type FF
Shaft Seal	No shaft seal
Approximate Weight	2.68 kg
Main Frame Dimension	100 mm
Magnet Stack Dimension	25.4 mm
Complete Overall Dimensions	Refer to applicable mechanical drawing

The weight is approximately 5.91 lb, or about 2.68 kg. The 100 mm frame and 25.4 mm stack are the primary dimensional identifiers for this configuration; the complete motor envelope should be taken from the applicable mechanical drawing rather than estimated from the frame and stack dimensions.

6. Model Number Explanation

The model number MPL-B310P-SK72AA provides useful information about the motor configuration.

Model Code	Meaning
MPL	MPL low-inertia brushless servo motor family
B	460 V class
3	Frame size 3 / 100 mm
10	Magnet stack 10 / 25.4 mm
P	5000 rpm configuration
S	Single-turn high-resolution encoder
K	Keyless shaft extension
72	No brake
AA	Catalog configuration

This coding structure is especially useful when comparing similar motors.

For example, MPL-B310P-SJ72AA and MPL-B310P-SK72AA share the same general frame, stack, speed, feedback, and no-brake configuration, but the shaft configuration is different.

The J configuration uses a keyed shaft, while the K configuration uses a keyless shaft.

7. Single-Turn High-Resolution Encoder

The MPL-B310P-SK72AA uses a single-turn high-resolution encoder.

The encoder supplies position feedback to the servo control system. The listed feedback arrangement uses 1024 Sin/Cos cycles per revolution with a Hiperface protocol.

This feedback information allows the servo system to monitor actual shaft movement and compare it with the commanded position and speed.

For applications involving repeated positioning, indexing, synchronized motion, and controlled acceleration, accurate feedback is a fundamental part of servo performance.

The single-turn encoder configuration should also be matched with the feedback requirements of the intended servo drive and motion-control system.

8. Keyless Shaft Design

One of the defining characteristics of the MPL-B310P-SK72AA is its keyless shaft extension.

A keyless shaft differs mechanically from a conventional keyed shaft.

With a keyed shaft, torque transmission normally uses a shaft key and a compatible hub or coupling.

With a keyless shaft, the mechanical connection is made using a suitable friction-based coupling, clamping hub, or other compatible shaft connection.

This can provide a clean shaft interface and can be advantageous in machines where the mechanical transmission has been designed specifically around a keyless connection.

However, a keyless motor should not automatically be substituted for a keyed motor simply because the frame and electrical specifications are similar.

The shaft interface must be checked carefully before replacement.

9. No-Brake Configuration

The MPL-B310P-SK72AA does not include an integrated holding brake.

This is indicated by the 72 configuration in the model number.

The no-brake arrangement can be suitable for horizontal axes, rotary mechanisms, conveyor systems, indexing equipment, and other applications where the motor does not need to mechanically hold the shaft when servo power is removed.

For vertical axes or gravity-loaded mechanisms, the absence of an integrated brake becomes an important selection consideration.

In such applications, the machine designer may need another suitable mechanical holding arrangement depending on the machine’s load and safety requirements.

The no-brake configuration also simplifies the motor-side electrical arrangement because there is no integrated motor brake circuit to control.

10. 100 mm Frame Size

The motor uses a 100 mm frame.

Frame size is one of the most important mechanical specifications when selecting a servo motor.

It affects mounting compatibility, flange dimensions, shaft location, motor envelope, and the relationship between the motor and the machine structure.

The 100 mm frame used by the MPL-B310P-SK72AA makes it suitable for many compact industrial machine axes while still providing the performance expected from a high-speed servo motor.

The frame dimension should not be confused with the complete motor length.

The 100 mm figure identifies the frame size, while the overall length and shaft projection depend on the complete mechanical configuration.

11. 25.4 mm Magnet Stack

The 25.4 mm magnet stack is another important part of the motor identification.

The “10” in the B310P model designation corresponds to the 25.4 mm magnet stack configuration.

The magnet stack affects the electromagnetic characteristics of the motor.

Within a common frame family, different stack lengths can result in different motor torque and power characteristics.

This is why selecting a replacement only by frame size can lead to an incorrect motor choice.

The frame, stack, voltage, speed, feedback, shaft, and brake configuration should all be compared.

12. 5000 RPM Speed Rating

The MPL-B310P-SK72AA has a 5000 rpm speed rating.

This makes it suitable for applications where high motor speed and rapid machine cycles are required.

High-speed servo motors can be useful for packaging, indexing, printing, converting, assembly, and other automated processes where the motor repeatedly accelerates and decelerates.

The actual operating speed in a machine depends on the load, required torque, acceleration profile, mechanical transmission, operating temperature, duty cycle, and servo drive configuration.

A 5000 rpm rating should therefore be treated as a motor capability rather than an indication that every machine should continuously operate at 5000 rpm.

13. Torque and Power Characteristics

The MPL-B310P-SK72AA is commonly specified with approximately 1.58 Nm continuous torque, approximately 3.61 Nm peak torque, and approximately 0.77 kW continuous power.

Continuous torque describes the motor’s ability to deliver torque during normal operating conditions.

Peak torque is important when the machine requires short-duration acceleration, deceleration, rapid positioning, or temporary load changes.

The difference between continuous and peak torque is important in servo sizing because a motor may require substantially more torque during acceleration than during steady-state operation.

14. Rotor Inertia

The rotor inertia of the MPL-B310P-SK72AA is approximately 4.4 × 10⁻⁵ kg·m².

Rotor inertia is important in a servo system because it affects how quickly the motor can accelerate or decelerate.

The lower the motor’s rotational inertia, the less torque is required solely to change the motor’s own rotational speed.

This characteristic is valuable in machines with rapid cyclic motion.

However, the motor rotor is only one part of the complete inertia calculation. The inertia of the driven load, gearbox, coupling, pulley, screw, belt, rollers, and other moving components must also be reflected to the motor shaft.

15. Dimensions and Weight

The principal dimensional specifications for the exact model are a 100 mm frame and a 25.4 mm magnet stack.

The reference product weight is approximately 2.68 kg.

Mechanical Parameter	Specification
Model	MPL-B310P-SK72AA
Frame Size	100 mm
Frame Classification	Frame 3
Magnet Stack	25.4 mm
Mounting Standard	IEC Metric
Mounting Hole Configuration	Free mounting holes / Type FF
Shaft Type	Keyless
Shaft Seal	No shaft seal
Brake	No brake
Connector	Right-angle SpeedTEC DIN
Connector Rotation	180°
Approximate Weight	2.68 kg
Frame Dimension	100 mm
Stack Dimension	25.4 mm
Complete Motor Envelope	Check exact mechanical drawing

The exact overall motor length, shaft projection, mounting-circle dimensions, and connector envelope should be verified from the mechanical documentation for the particular installation.

16. Electrical and Connection Parameters

Electrical Parameter	Specification
Model	MPL-B310P-SK72AA
Armature Voltage	460 V
Voltage Class	400/460 V class
Motor Type	Brushless AC servo motor
Rated Speed	5000 rpm
Continuous Torque	Approximately 1.58 Nm
Peak Torque	Approximately 3.61 Nm
Continuous Power	Approximately 0.77 kW
Feedback	Single-turn high-resolution encoder
Feedback Resolution	1024 Sin/Cos cycles/rev
Feedback Protocol	Hiperface
Brake	No brake
Connector	SpeedTEC DIN
Connector Style	Right-angle
Connector Rotation	180°
Frame	100 mm
Stack	25.4 mm
Approximate Weight	2.68 kg
Dimensions	100 mm frame / 25.4 mm stack

The product configuration specifically identifies the motor as a 460 V model with a right-angle SpeedTEC DIN connector and no brake.

17. Mechanical Parameters

Mechanical Parameter	Specification
Model	MPL-B310P-SK72AA
Motor Type	Low-inertia brushless servo
Frame Size	100 mm
Magnet Stack	25.4 mm
Shaft	Keyless shaft extension
Shaft Seal	No shaft seal
Mounting	IEC metric flange
Mounting Holes	Free mounting holes / Type FF
Brake	No brake
Connector	SpeedTEC DIN
Connector Position	Right-angle
Connector Rotation	180°
Rated Speed	5000 rpm
Approximate Weight	2.68 kg
Frame Dimension	100 mm
Stack Dimension	25.4 mm
Complete Dimensions	Refer to mechanical drawing

The keyless shaft and no-brake configuration are specifically identified in the product selection data for this model.

18. Product Applications

Packaging Machinery

The MPL-B310P-SK72AA can be used in packaging machinery where a servo axis must repeatedly accelerate, decelerate, stop, and reposition.

Typical functions can include product indexing, feeder movement, film handling, cutter mechanisms, rotary positioning, and synchronization of machine components.

The 5000 rpm speed capability can be useful in high-cycle machinery where rapid rotary movement is required.

Assembly Machines

Automated assembly equipment frequently requires servo-controlled positioning.

The MPL-B310P-SK72AA can be used for indexing units, rotary positioning mechanisms, component handling, feeder systems, and other machine axes.

The high-resolution feedback system allows the motion-control system to monitor motor position and speed during operation.

Material Handling

The motor can also be used in material-handling systems that require controlled rotary motion.

Applications may include conveyor positioning, transfer systems, indexing mechanisms, rollers, automated handling units, and machine-feed mechanisms.

For applications involving suspended or gravity-loaded loads, the no-brake configuration should be carefully considered during machine design.

Printing and Converting

Printing and converting machinery can require accurately controlled rotary movement.

Servo motors are commonly used for rollers, feeders, indexing mechanisms, tension-related motion, and synchronized rotary axes.

The combination of high-speed operation and feedback control makes the MPL-B310P-SK72AA suitable for selected applications within this category.

Machine Tools

The motor can be applied to selected machine-tool auxiliary axes and automated positioning mechanisms.

Examples include tool-handling mechanisms, rotary positioning, automated feeders, auxiliary axes, and other controlled machine movements.

The actual suitability depends on the required torque, speed, acceleration, mechanical load, and duty cycle.

Inspection Equipment

Automated inspection systems often need precise movement between measurement or inspection locations.

The MPL-B310P-SK72AA can be used for rotary indexing, positioning mechanisms, inspection tables, actuator systems, and other controlled axes.

Production Machinery

General production machinery can also use this type of servo motor for repetitive positioning and speed-controlled motion.

Typical examples include automated production stations, indexing equipment, feeders, transfer mechanisms, and machine automation systems.

19. Main Product Advantages

Low-Inertia Motor Construction

The low-inertia design is one of the main characteristics of the MPL series.

It is particularly useful in machines that perform repeated acceleration and deceleration.

A low-inertia rotor can help the servo system change speed rapidly when the machine requires short movement cycles.

5000 RPM Capability

The 5000 rpm speed rating gives the motor a useful operating range for high-speed industrial motion applications.

This can be beneficial where machine productivity depends on short cycle times.

High-Resolution Feedback

The single-turn high-resolution encoder provides detailed feedback to the motion-control system.

The listed 1024 Sin/Cos cycles per revolution and Hiperface feedback configuration support controlled servo operation.

Keyless Shaft

The keyless shaft configuration provides a direct mechanical interface for suitable clamping hubs and compatible couplings.

For machinery specifically designed around keyless shaft connections, this can be a useful feature.

It also means that the mechanical transmission should be checked carefully before replacing the motor with a keyed version.

No-Brake Simplicity

The absence of an integrated brake simplifies the motor configuration for applications where shaft holding is not required.

This can be appropriate for many horizontal rotary axes and other machine mechanisms where the servo system itself provides the required motion control.

Rotatable Right-Angle Connector

The right-angle connector can be rotated through 180 degrees.

This allows the installer to choose a connector orientation that better suits the available space and cable-routing arrangement.

Compact Frame

The 100 mm frame provides a compact motor platform for a range of industrial motion applications.

The 25.4 mm magnet stack keeps this configuration within the relatively compact B310P family.

20. Cable and Connector Considerations

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

The connector can be rotated through 180 degrees.

This is useful when cable space behind the motor is limited.

Correct cable selection is important for servo systems because the motor cable and feedback cable must match the electrical and feedback requirements of the complete motion system.

Cable routing should also avoid sharp bends, excessive mechanical stress, and interference with moving machine components.

21. Installation Considerations

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

Shaft alignment is particularly important for servo applications because misalignment can increase bearing loads, vibration, mechanical noise, and wear.

The keyless shaft should be connected using a suitable coupling or clamping mechanism designed for the shaft dimensions and required torque.

The motor should not be forced into alignment by the coupling.

The mounting flange and machine structure should provide sufficient rigidity to prevent unnecessary vibration during acceleration and deceleration.

22. No-Brake Application Considerations

Because this motor has no integrated brake, machine designers should determine whether the application requires a separate holding mechanism.

For horizontal axes, a brake may not be necessary.

For vertical axes, suspended loads, or mechanisms where the load can move when motor torque is removed, a separate holding solution may be required.

The absence of a motor brake should therefore be considered during the original machine design rather than treated as a minor configuration difference.

23. Servo Tuning Considerations

The low-inertia rotor makes the MPL-B310P-SK72AA suitable for dynamic motion applications, but correct servo tuning remains important.

The complete system should be evaluated using:

• Motor inertia.
• Load inertia.
• Reflected inertia.
• Gear ratio.
• Coupling stiffness.
• Belt or screw transmission.
• Mechanical backlash.
• Acceleration.
• Deceleration.
• Required positioning accuracy.
• Machine resonance.
• Operating speed.
• Duty cycle.

A rigid mechanical system can behave very differently from a system with flexible belts, long shafts, or compliant couplings.

Servo tuning should therefore be performed based on the actual machine rather than relying only on the motor’s nominal specifications.

24. Maintenance Considerations

Routine maintenance should include inspection of the motor mounting, shaft connection, connector, cables, and surrounding environment.

The keyless shaft connection should be checked periodically for correct mechanical condition.

The motor should also be protected from excessive contamination, moisture, vibration, and temperatures outside its specified operating conditions.

Unusual vibration, noise, overheating, or unexpected positioning errors should be investigated promptly because these symptoms can indicate mechanical, electrical, feedback, or servo-tuning problems.

25. Replacement Selection Considerations

When replacing an MPL-B310P-SK72AA, the entire model number should be matched as closely as possible.

The most important characteristics include:

Selection Parameter	MPL-B310P-SK72AA
Model	MPL-B310P-SK72AA
Voltage	460 V AC
Frame	100 mm
Stack	25.4 mm
Speed	5000 rpm
Feedback	Single-turn high-resolution encoder
Feedback Protocol	Hiperface
Shaft	Keyless
Brake	No brake
Connector	SpeedTEC DIN
Continuous Torque	Approx. 1.58 Nm
Peak Torque	Approx. 3.61 Nm
Continuous Power	Approx. 0.77 kW
Approximate Weight	2.68 kg
Dimensions	100 mm frame / 25.4 mm stack

A motor with the same frame but a different shaft, feedback, brake, voltage, or stack configuration should not automatically be considered a direct replacement.

26. Five Related Models in the Same Series

The following five models are closely related to the MPL-B310P-SK72AA and can be considered when comparing different configurations within the same general MPL family.

Model	Feedback	Shaft	Brake	Speed	Frame / Stack	Approx. Weight	Dimensions
MPL-B310P-SJ72AA	Single-turn high-resolution	Keyed	No brake	5000 rpm	100 mm / 25.4 mm	Approx. 2.7 kg class	100 mm frame / 25.4 mm stack
MPL-B310P-SJ74AA	Single-turn high-resolution	Keyed	24 V DC	5000 rpm	100 mm / 25.4 mm	Approx. 5.4 kg class*	100 mm frame / 25.4 mm stack
MPL-B310P-SK74AA	Single-turn high-resolution	Keyless	24 V DC	5000 rpm	100 mm / 25.4 mm	Verify exact configuration	100 mm frame / 25.4 mm stack
MPL-B310P-RJ72AA	Resolver	Keyed	No brake	5000 rpm	100 mm / 25.4 mm	Verify exact configuration	100 mm frame / 25.4 mm stack
MPL-B310P-RK72AA	Resolver	Keyless	No brake	5000 rpm	100 mm / 25.4 mm	Verify exact configuration	100 mm frame / 25.4 mm stack

*Brake-equipped configurations can have a different published weight; exact weight should be checked against the individual catalog configuration.

The B310P family includes keyed and keyless shaft versions, brake and no-brake configurations, and different feedback arrangements.

27. Detailed Comparison of the Closest Models

Model	Feedback	Shaft	Brake	Frame	Stack	Speed	Approx. Weight	Dimensions
MPL-B310P-SK72AA	Single-turn high-resolution	Keyless	None	100 mm	25.4 mm	5000 rpm	2.68 kg	100 mm / 25.4 mm
MPL-B310P-SJ72AA	Single-turn high-resolution	Keyed	None	100 mm	25.4 mm	5000 rpm	Approx. 2.7 kg class	100 mm / 25.4 mm
MPL-B310P-SK74AA	Single-turn high-resolution	Keyless	24 V DC	100 mm	25.4 mm	5000 rpm	Verify exact model	100 mm / 25.4 mm
MPL-B310P-SJ74AA	Single-turn high-resolution	Keyed	24 V DC	100 mm	25.4 mm	5000 rpm	Verify exact model	100 mm / 25.4 mm
MPL-B310P-RK72AA	Resolver	Keyless	None	100 mm	25.4 mm	5000 rpm	Verify exact model	100 mm / 25.4 mm

The most obvious configuration difference between the SK72AA and SJ72AA versions is the shaft design.

The difference between the SK72AA and SK74AA versions is the brake.

The difference between the SK72AA and RK72AA versions is the feedback technology.

28. Five Other Commonly Referenced Models from the Same Brand

The following models are additional examples from the same general industrial servo motor product range and can be useful when comparing different motor sizes and configurations.

Model	Product Family	General Configuration	Feedback / Option	Speed	Frame / Stack	Approx. Weight	Dimensions
MPL-B210V-VJ72AA	MP-Series MPL	Low-inertia servo	V-series feedback configuration	Model dependent	B210V configuration	Verify exact model	Frame / stack per drawing
MPL-B220T-VJ72AA	MP-Series MPL	Low-inertia servo	V-series feedback configuration	Model dependent	B220T configuration	Verify exact model	Frame / stack per drawing
MPL-B230P-VJ72AA	MP-Series MPL	Low-inertia servo	V-series feedback configuration	5000 rpm class	B230P configuration	Verify exact model	Frame / stack per drawing
MPL-B320P-SJ72AA	MP-Series MPL	Low-inertia servo	Single-turn high-resolution	5000 rpm	100 mm / 50.8 mm	Verify exact model	100 mm / 50.8 mm
MPL-B330P-MJ72AA	MP-Series MPL	Low-inertia servo	Multi-turn high-resolution	5000 rpm class	B330P configuration	Verify exact model	Frame / stack per drawing

These models illustrate the wider range of MPL servo configurations, including different frame/stack combinations and feedback arrangements.

29. B310P versus B320P

The B320P family is particularly relevant when comparing motor configurations with a longer magnet stack.

Model	Frame	Magnet Stack	Speed	Feedback	Shaft	Brake	Approx. Weight	Dimensions
MPL-B310P-SK72AA	100 mm	25.4 mm	5000 rpm	Single-turn high-resolution	Keyless	None	2.68 kg	100 mm / 25.4 mm
MPL-B310P-SJ72AA	100 mm	25.4 mm	5000 rpm	Single-turn high-resolution	Keyed	None	Approx. 2.7 kg class	100 mm / 25.4 mm
MPL-B320P-SK72AA	100 mm	50.8 mm	5000 rpm	Single-turn high-resolution	Keyless	None	Verify exact model	100 mm / 50.8 mm
MPL-B320P-SJ72AA	100 mm	50.8 mm	5000 rpm	Single-turn high-resolution	Keyed	None	Verify exact model	100 mm / 50.8 mm

The B310P and B320P models share the 100 mm frame classification but use different magnet stack lengths.

This distinction is important because the stack length is part of the motor’s electromagnetic and performance configuration.

30. Practical Advantages in Machine Design

The MPL-B310P-SK72AA provides a combination of characteristics that can be useful for compact industrial motion systems.

The low-inertia rotor is suited to applications with repeated acceleration and deceleration.

The 5000 rpm speed rating supports high-speed machine operation where the mechanical system is designed for that speed.

The high-resolution single-turn encoder provides detailed feedback for closed-loop motion control.

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

The absence of a brake makes the motor configuration straightforward for applications where a motor holding brake is not required.

The 180-degree rotatable right-angle connector can simplify installation in compact machine structures.

31. Typical Machine Functions

The MPL-B310P-SK72AA can be considered for machine functions such as:

• Rotary indexing.
• Product positioning.
• Conveyor synchronization.
• Feeder control.
• Pick-and-place mechanisms.
• Automated assembly.
• Packaging mechanisms.
• Printing rollers.
• Material transfer.
• Rotary inspection.
• Machine-tool auxiliary movement.
• Automated production stations.
• High-cycle positioning.
• Speed-controlled rotary mechanisms.

The actual motor selection should always be based on the required torque, speed, acceleration, inertia, duty cycle, and mechanical interface.

32. Product Selection Checklist

Selection Item	MPL-B310P-SK72AA
Model	MPL-B310P-SK72AA
Brand	Allen-Bradley
Series	MPL Low-Inertia Servo
Product Family	MP-Series
Motor Type	Brushless AC Rotary Servo
Voltage	460 V AC
Frame	100 mm
Stack	25.4 mm
Speed	5000 rpm
Continuous Torque	Approx. 1.58 Nm
Peak Torque	Approx. 3.61 Nm
Continuous Power	Approx. 0.77 kW
Feedback	Single-turn high-resolution
Feedback Resolution	1024 Sin/Cos cycles/rev
Feedback Protocol	Hiperface
Shaft	Keyless
Brake	No brake
Connector	SpeedTEC DIN
Connector Type	Right-angle
Connector Rotation	180°
Approx. Weight	2.68 kg
Main Dimensions	100 mm frame / 25.4 mm stack
Complete Dimensions	Verify mechanical drawing

This checklist is useful when comparing the motor with an existing installation or selecting a replacement.

33. Key Differences from MPL-B310P-SJ72AA

The two models are very closely related.

Parameter	MPL-B310P-SK72AA	MPL-B310P-SJ72AA
Feedback	Single-turn high-resolution	Single-turn high-resolution
Frame	100 mm	100 mm
Magnet Stack	25.4 mm	25.4 mm
Speed	5000 rpm	5000 rpm
Shaft	Keyless	Keyed
Brake	No brake	No brake
Connector	SpeedTEC DIN	SpeedTEC DIN
Main Dimensional Class	100 mm / 25.4 mm	100 mm / 25.4 mm
Approx. Weight	2.68 kg	Approx. 2.7 kg class
Primary Difference	Keyless shaft	Keyed shaft

The shaft configuration is therefore the major mechanical distinction between these two closely related models.

34. Key Differences from MPL-B310P-SK74AA

Parameter	MPL-B310P-SK72AA	MPL-B310P-SK74AA
Feedback	Single-turn high-resolution	Single-turn high-resolution
Frame	100 mm	100 mm
Magnet Stack	25.4 mm	25.4 mm
Speed	5000 rpm	5000 rpm
Shaft	Keyless	Keyless
Brake	No brake	24 V DC brake
Connector	SpeedTEC DIN	SpeedTEC DIN
Dimensions	100 mm / 25.4 mm	100 mm / 25.4 mm
Weight	Approx. 2.68 kg	Verify exact model
Primary Difference	No brake	24 V DC brake

This comparison shows why the last portion of the catalog number should be checked carefully when ordering or replacing a servo motor.

35. Important Points for Replacement

For a direct replacement, the following items should be matched:

Voltage: 460 V class.

Frame: 100 mm.

Magnet stack: 25.4 mm.

Speed: 5000 rpm.

Feedback: Single-turn high-resolution encoder.

Feedback interface: Hiperface.

Shaft: Keyless.

Brake: No brake.

Connector: SpeedTEC DIN, right-angle configuration.

Mounting: IEC metric.

Mechanical envelope: Verify the complete drawing.

A motor can have the same frame and speed while still being unsuitable as a direct replacement because the feedback or shaft configuration may be different.

36. Final Technical Summary

Parameter	Final Specification
Model	MPL-B310P-SK72AA
Brand	Allen-Bradley
Series	MPL Low-Inertia Servo Motors
Product Family	MP-Series
Motor Type	Brushless AC Rotary Servo Motor
Voltage	460 V AC
Voltage Class	400/460 V class
Frame Size	3
Frame Dimension	100 mm
Magnet Stack	10
Magnet Stack Dimension	25.4 mm
Rated Speed	5000 rpm
Continuous Torque	Approximately 1.58 Nm
Peak Torque	Approximately 3.61 Nm
Continuous Power	Approximately 0.77 kW
Rotor Inertia	Approximately 4.4 × 10⁻⁵ kg·m²
Feedback	Single-turn high-resolution encoder
Feedback Resolution	1024 Sin/Cos cycles/rev
Feedback Protocol	Hiperface
Shaft	Keyless shaft extension
Shaft Seal	No shaft seal
Brake	No brake
Connector	SpeedTEC DIN
Connector Configuration	Right-angle
Connector Rotation	180°
Mounting	IEC metric
Mounting Holes	Free mounting holes / Type FF
Approximate Weight	2.68 kg
Main Dimensions	100 mm frame / 25.4 mm stack
Complete Dimensions	Refer to mechanical drawing

The core specifications identify the MPL-B310P-SK72AA as a compact, high-speed, low-inertia servo motor with a 100 mm frame, 25.4 mm magnet stack, 5000 rpm rating, single-turn high-resolution feedback, keyless shaft, and no integrated brake.

37. Final Product Description

The Allen-Bradley MPL-B310P-SK72AA is a 5000 rpm low-inertia brushless AC rotary servo motor designed for industrial motion-control applications requiring fast response, controlled positioning, and repeatable machine movement.

It uses a 100 mm frame and 25.4 mm magnet stack, giving the motor a compact physical configuration suitable for many automated machine axes.

The motor provides approximately 1.58 Nm of continuous torque and approximately 3.61 Nm of peak torque, with approximately 0.77 kW of continuous rated power.

Its single-turn high-resolution encoder provides position feedback through a Hiperface interface, with a listed feedback resolution of 1024 Sin/Cos cycles per revolution.

One of the defining features of the SK72AA configuration is its keyless shaft. This makes the motor particularly relevant to mechanical systems designed around keyless couplings or clamping hubs.

Another defining feature is the absence of an integrated brake. This provides a straightforward motor configuration for applications where the machine does not require a motor-mounted holding brake.

The right-angle SpeedTEC DIN connector can rotate through 180 degrees, which provides additional flexibility when routing cables and installing the motor in space-limited machinery.

The approximate product weight is 2.68 kg, while the principal dimensional identifiers are the 100 mm frame and 25.4 mm magnet stack.

The MPL-B310P-SK72AA can be used in packaging equipment, automated assembly machinery, material-handling systems, printing and converting equipment, inspection machinery, indexing systems, production equipment, and other industrial applications requiring controlled rotary motion.

When selecting this motor as a replacement, the complete model number should be checked carefully. In particular, the voltage, frame size, magnet stack, speed, encoder type, shaft configuration, brake configuration, connector arrangement, and mechanical dimensions should all match the requirements of the machine.

The most important distinction between the SK72AA and closely related MPL models is the mechanical and functional configuration represented by the model suffix. A keyed-shaft model, brake-equipped model, or different feedback model may look similar externally but should not automatically be treated as an interchangeable replacement.

Overall, the MPL-B310P-SK72AA represents a compact, high-speed, low-inertia servo motor configuration intended for industrial motion systems where dynamic response, high-resolution feedback, keyless mechanical coupling, and reliable closed-loop positioning are important.