Allen-Bradley MPL-B430P-HK72AA Servo Motor – Detailed Product Information, Technical Specifications, Applications and Related Models

1. Product Overview

The Allen-Bradley MPL-B430P-HK72AA is a low-inertia brushless AC servo motor belonging to the MP-Series MPL family. It is designed for demanding motion-control applications where high rotational speed, accurate positioning, fast acceleration and repeatable machine movement are important.

The motor is built around a 115 mm frame size and a 76.2 mm magnet stack length, giving it a useful balance between physical size, torque capability and dynamic response. The rated speed is 5000 rpm, making this model particularly suitable for high-speed indexing, positioning, feeding, conveying and other automated motion applications.

The MPL-B430P-HK72AA uses a 2000-line incremental encoder for feedback and does not include a holding brake. Its keyless shaft configuration is useful in machine designs where the mechanical connection is made through a suitable hub, coupling or other shaft interface rather than a keyed shaft arrangement.

The motor uses an IEC metric mounting arrangement and a right-angle SpeedTEC DIN connector that can be rotated through 180 degrees. This connector arrangement can make cable routing more convenient when the available installation space around the motor is limited.

2. Brand and Product Series

The model belongs to the MPL low-inertia brushless servo motor series, a family intended for applications requiring controlled acceleration, accurate positioning and responsive servo performance. The B430P motor family is rated around 5000 rpm and is associated with approximately 2.2 kW output, 6.55 N·m continuous stall torque and 19.8 N·m peak stall torque.

3. Main Technical Parameters

The 6.55 N·m continuous stall torque, 19.8 N·m peak stall torque, 2.2 kW family rating and 5000 rpm speed correspond to the B430P motor family. The exact HK72AA configuration is distinguished by its keyless shaft and lack of a brake.

4. Dimensions and Weight

The most important mechanical dimensions for identifying and comparing this motor are the 115 mm frame size and 76.2 mm magnet stack length.

A complete overall envelope dimension should be taken from the applicable mechanical drawing because the total motor length can vary with connector arrangement, shaft configuration and other mechanical details. For product-selection purposes, the following dimensions are the principal published dimensional values associated with this configuration.

The 115 mm frame and 76.2 mm stack length are directly associated with the B430P frame-4 configuration. A published specification for the HK72AA configuration gives approximately 6.4 kg for the motor weight.

5. Product Introduction

The MPL-B430P-HK72AA is designed as a high-speed, low-inertia servo motor for industrial motion applications. Its 5000 rpm operating class makes it a strong choice when machine throughput and rapid movement are important.

The low-inertia rotor construction allows the motor to respond quickly to changes in command. In a properly matched servo system, this can help the machine accelerate and decelerate efficiently without requiring an unnecessarily large motor for every movement.

The B430P frame is also positioned above smaller MPL motor sizes in terms of torque capability. With approximately 6.55 N·m of continuous stall torque and approximately 19.8 N·m of peak stall torque, it can handle a broader range of dynamic motion requirements than smaller motors in the same general family.

Another important characteristic of the HK72AA is its keyless shaft. Instead of using a conventional shaft key, the machine designer can use an appropriate coupling or clamping connection. This can be advantageous in applications where low backlash, flexible mechanical integration or simplified coupling arrangements are desired.

The motor does not have an integrated holding brake. This makes the HK72AA different from brake-equipped versions such as the corresponding HJ74AA or SJ74AA configurations.

The 2000-line incremental encoder provides motor-position feedback to the servo control system. This feedback allows the drive to monitor motor rotation and regulate speed, position and torque as part of a closed-loop motion system.

6. Low-Inertia Motor Design

One of the main characteristics of the MPL-B430P-HK72AA is its low-inertia design.

In a servo system, motor inertia has a direct effect on how quickly the motor can change its speed. A lower rotor inertia can make it easier for the servo system to accelerate and decelerate the motor, particularly when the driven load is properly matched to the motor.

This characteristic is especially useful for machines that repeatedly perform short movements. Examples include indexing mechanisms, pick-and-place systems, packaging machines, cutting equipment and high-speed material-handling systems.

The approximate rotor inertia associated with the B430P family is 0.00038 kg·m².

7. 5000 RPM High-Speed Capability

The MPL-B430P-HK72AA has a rated speed of 5000 rpm.

A 5000 rpm servo motor can be useful when the machine requires fast rotary motion or when a high-speed motor is combined with a gearbox, belt drive, ballscrew or other mechanical transmission.

High-speed capability can also allow a machine designer to select a suitable transmission ratio so that the motor operates in an efficient speed range while the mechanical output provides the required load torque.

For applications with repeated acceleration and deceleration, however, the complete motor-drive-load combination should always be evaluated rather than selecting a motor based only on maximum rpm.

8. Torque Characteristics

The B430P family provides approximately 6.55 N·m of continuous stall torque and approximately 19.8 N·m of peak stall torque.

The continuous torque rating is important for evaluating the motor’s ability to sustain a load, while peak torque is especially important during acceleration, deceleration and short-duration dynamic events.

The difference between continuous and peak torque allows a servo system to provide short bursts of higher torque when the machine requires rapid movement.

These figures are associated with the B430P motor family and are useful for preliminary motor sizing. Final application sizing should also consider actual load inertia, acceleration time, duty cycle, mechanical transmission efficiency and operating speed.

9. Encoder and Feedback System

The MPL-B430P-HK72AA uses a 2000-line incremental encoder.

Incremental feedback is widely used in servo systems because it provides the control system with information about motor rotation. The feedback signal allows the servo drive to continuously monitor motor movement and adjust the applied motor command.

For applications such as indexing, speed regulation and repeated positioning, incremental feedback can provide the necessary information for closed-loop control.

The HK72AA should therefore be considered when the application requires conventional incremental feedback rather than a high-resolution single-turn or multi-turn absolute feedback configuration.

Within the same B430P family, other models are available with single-turn and multi-turn high-resolution feedback, giving designers several options depending on the positioning requirements of the machine.

10. Keyless Shaft Configuration

The HK72AA uses a keyless shaft extension.

This is an important distinction when comparing it with other MPL-B430P configurations. Some models use keyed shafts, while the HK versions use keyless shaft arrangements.

A keyless shaft can be useful when the motor is connected through a precision coupling or clamping mechanism. The final coupling selection should be based on the actual torque, speed, shaft diameter, allowable misalignment and required backlash characteristics of the machine.

For replacement projects, the shaft style should be checked carefully before substituting another motor. A motor with similar electrical specifications may still require a different mechanical coupling if its shaft configuration is different.

11. Connector and Installation Arrangement

The MPL-B430P-HK72AA uses a right-angle SpeedTEC DIN connector. The connector can be rotated through approximately 180 degrees.

This feature is useful in compact machinery because the direction of the cable connection can be adjusted according to the available space.

A flexible connector orientation can also help reduce unnecessary cable bending. This can be particularly useful on machines where motors are mounted close to guards, covers, linear slides or other mechanical components.

When installing the motor, adequate clearance should still be provided around the connector so that the cable can be routed without excessive mechanical stress.

12. Brake Configuration

The MPL-B430P-HK72AA is a no-brake version.

This means the motor does not contain an integrated holding brake for mechanically holding a vertical or stationary load when servo power is removed.

For horizontal applications where the mechanical system does not need the motor to hold a load after power removal, the no-brake configuration can be perfectly suitable.

For vertical axes, suspended loads or machines requiring a holding function during power-off conditions, a brake-equipped motor may be more appropriate.

In the same B430P family, brake-equipped variants are available, allowing the motor configuration to be matched more closely to the machine’s mechanical requirements.

13. Product Advantages

13.1 High-Speed Operation

The 5000 rpm rating is one of the main advantages of the MPL-B430P-HK72AA.

It provides a useful speed range for high-throughput machinery and applications requiring rapid rotary motion.

13.2 Low-Inertia Response

The low-inertia design allows the motor to react quickly to command changes.

This is especially beneficial for machines that repeatedly accelerate, decelerate and reposition the load.

13.3 Strong Torque Capability

With approximately 6.55 N·m of continuous stall torque and approximately 19.8 N·m of peak stall torque, the B430P family provides substantial torque capacity within its frame class.

This makes the motor suitable for applications that require both continuous load capability and short-duration acceleration torque.

13.4 Compact 115 mm Frame

The 115 mm frame provides a relatively compact mechanical package for the motor’s performance class.

This can be useful when machine builders need to maintain a compact machine footprint while still requiring a relatively powerful servo motor.

13.5 Keyless Shaft Flexibility

The keyless shaft design can simplify integration with suitable precision couplings and clamping systems.

It can also be attractive for applications where backlash and coupling alignment are important considerations.

13.6 Flexible Connector Orientation

The 180-degree rotatable right-angle connector provides additional installation flexibility.

This can make the motor easier to integrate into compact machine structures where a fixed connector direction would create cable-routing problems.

13.7 Proven Industrial Servo Architecture

The MPL family is designed around brushless permanent-magnet servo motor technology and is intended for closed-loop industrial motion control.

The combination of high speed, low inertia and feedback control makes this type of motor appropriate for a wide variety of automated machinery.

14. Typical Applications

The MPL-B430P-HK72AA can be considered for many types of industrial automation equipment.

Packaging Machinery

Packaging machines often require repeated high-speed movements, accurate positioning and fast acceleration.

The 5000 rpm speed and low-inertia design make the B430P family suitable for indexing mechanisms, film handling, cutting, sealing and other packaging movements when the motor is correctly sized for the load.

Material Handling

The motor can be used in automated conveyors, transfer mechanisms, feeders and positioning systems where controlled acceleration and repeatable movement are important.

The exact suitability depends on the load inertia, belt or gearbox ratio, required speed and duty cycle.

Printing and Converting Equipment

Printing and converting machinery often requires accurate synchronization between multiple moving sections.

Servo motors with reliable feedback are useful for controlling rollers, positioning mechanisms and other synchronized axes.

Machine Tools

The motor can be considered for auxiliary machine-tool axes and other positioning functions where controlled movement and repeatability are required.

For demanding machine-tool applications, final selection should take into account the required positioning accuracy, acceleration profile and mechanical stiffness.

Pick-and-Place Equipment

High-speed pick-and-place machinery benefits from motors that can rapidly accelerate and decelerate.

The low-inertia characteristics of the B430P family can help achieve fast movement when the motor and load inertia are appropriately matched.

Automated Assembly Equipment

Assembly machinery often requires repeatable positioning and controlled movement.

The MPL-B430P-HK72AA can be considered for rotary positioning axes, indexing mechanisms and other servo-controlled movements.

Cutting and Processing Machines

Cutting machinery frequently requires accurate synchronization between feeding and processing movements.

The motor’s 5000 rpm capability and incremental feedback make it suitable for a wide range of controlled rotary and feed applications.

Textile Machinery

Textile machinery can require continuous high-speed operation combined with controlled acceleration and deceleration.

The B430P motor can be considered for selected textile machine axes where the required torque and speed fall within the motor’s operating envelope.

15. Recommended Applications by Motion Requirement

The most important limitation is that this particular configuration has no integrated brake and uses an incremental encoder with a keyless shaft. Those three characteristics should be checked before using it as a direct replacement for another motor.

16. Five Closely Related Models in the Same MPL-B430P Family

The following models are particularly relevant when comparing alternatives to the MPL-B430P-HK72AA.

The main differences between these models are feedback technology, shaft configuration and brake availability. The basic B430P performance class remains closely related across the group.

17. Comparison with MPL-B430P-HJ72AA

The HJ72AA is one of the closest alternatives to the HK72AA.

Both motors use incremental encoder feedback, both operate at 5000 rpm, and both use the same 115 mm frame and 76.2 mm magnet stack.

The key mechanical difference is the shaft. The HK72AA uses a keyless shaft, while the HJ72AA uses a keyed shaft.

Therefore, the choice between these two models is often determined by the machine coupling arrangement rather than basic motor performance.

18. Comparison with MPL-B430P-HJ74AA

The HJ74AA is another closely related model, but it adds an integrated holding brake and uses a keyed shaft.

This makes the HJ74AA more appropriate for applications where a brake is required, particularly certain vertical-axis applications.

The HK72AA is lighter because it does not include the brake. Its approximately 6.4 kg weight makes it attractive where minimizing motor mass is important.

19. Comparison with MPL-B430P-MJ72AA

The MJ72AA uses multi-turn high-resolution absolute feedback.

This is a major difference from the incremental encoder used by the HK72AA.

For applications where absolute position information and multi-turn position capability are important, the MJ72AA can provide a more suitable feedback architecture.

The HK72AA, in contrast, is a more conventional incremental-feedback solution and may be attractive for applications where absolute multi-turn feedback is not required.

20. Comparison with MPL-B430P-MK72AA

The MK72AA combines multi-turn high-resolution absolute feedback with a keyless shaft.

This makes it mechanically similar to the HK72AA in terms of the keyless shaft, while providing a more advanced feedback arrangement.

The MK72AA is therefore an interesting alternative when the machine requires keyless mechanical integration but also benefits from multi-turn absolute feedback.

21. Comparison with MPL-B430P-SK72AA

The SK72AA uses single-turn high-resolution feedback and a keyless shaft.

It maintains the same general 115 mm frame and 76.2 mm stack configuration, but changes the feedback technology from incremental to single-turn high-resolution.

This makes it useful when the machine requires higher-resolution single-turn position information but does not require multi-turn absolute position capability.

22. Five Popular Allen-Bradley Models for Comparison

The following five models are useful reference points when comparing servo motor capacity across different motor sizes and configurations.

The B330P, B420P and B430P families represent a progression toward higher torque and power capability. The B430P family is rated at approximately 2.2 kW, 6.55 N·m continuous stall torque and 19.8 N·m peak stall torque.

23. Model Number Interpretation

The model number MPL-B430P-HK72AA contains several useful configuration indicators.

The exact interpretation of individual model-code positions should always be checked against the applicable product catalog when ordering a replacement because small changes in the code can represent important differences in feedback, shaft and brake configuration.

24. Important Selection Considerations

When selecting the MPL-B430P-HK72AA for a machine, motor speed should not be the only consideration.

The load inertia should be evaluated first. A servo motor can provide excellent performance when the motor and driven load are appropriately matched, but an excessively high load inertia can reduce acceleration performance and make servo tuning more difficult.

The required continuous torque should also be checked against the machine’s actual duty cycle.

Peak torque is important for acceleration and short-duration load changes, while continuous torque is more important for sustained loads.

The required stopping behavior is another important factor. If the machine contains a vertical axis or another load that must remain mechanically supported when power is removed, the no-brake HK72AA configuration may not be the best choice.

The feedback requirement must also be considered. The HK72AA uses incremental feedback, so applications requiring absolute position retention or multi-turn absolute feedback may be better served by an appropriate S- or M-series configuration within the same motor family.

25. Installation and Maintenance Considerations

The motor should be installed on a mechanically rigid mounting surface.

Proper alignment between the motor shaft and the driven mechanism is important. Misalignment can increase bearing loads, coupling stress and vibration.

Because the HK72AA uses a keyless shaft, the coupling or clamping mechanism should be selected carefully. The connection should be capable of transmitting the required continuous and peak torque without slipping.

Cable routing should also be planned carefully around the right-angle connector. The rotatable connector provides flexibility, but the cable should not be subjected to excessive bending, pulling or twisting.

The motor should be protected from contamination beyond its specified environmental capability. The standard configuration does not include a shaft seal, so applications involving liquids, washdown conditions or significant contamination require particular attention to motor orientation and environmental protection.

The motor should also be checked periodically for unusual vibration, bearing noise, abnormal heating, connector damage and mechanical coupling problems.

26. Replacement Considerations

When replacing an existing motor with an MPL-B430P-HK72AA, the following points should be checked:

The most common mistake when replacing a servo motor is to compare only the model’s voltage and power. The feedback type, shaft style, brake configuration, connector arrangement and mechanical dimensions are equally important.

27. Lifecycle and Replacement Note

The MPL-B430P-HK72AA is listed as a discontinued product, with the discontinuation date given as July 23, 2024. A listed engineering replacement is the MPL-B430P-SK72AA.

For an existing machine, however, the engineering replacement should not automatically be treated as a drop-in mechanical substitute without checking the machine design.

The HK72AA uses a 2000-line incremental encoder and a keyless shaft, while the SK72AA uses single-turn high-resolution feedback. Therefore, the control-system configuration and feedback requirements should be reviewed before making a substitution.

For maintenance of existing equipment, the original HK72AA may still be relevant where the machine was designed specifically around its mechanical and feedback configuration.

28. Overall Product Assessment

The Allen-Bradley MPL-B430P-HK72AA is a high-speed, low-inertia servo motor designed for industrial motion-control applications that require fast response, controlled positioning and reliable rotary movement.

Its 115 mm frame, 76.2 mm magnet stack, 5000 rpm speed, approximately 6.55 N·m continuous torque and approximately 19.8 N·m peak torque make it a strong member of the B430P performance class.

Its keyless shaft is a major mechanical characteristic, while the 2000-line incremental encoder provides conventional closed-loop feedback.

The absence of an integrated brake makes the motor particularly suitable for applications where a holding brake is not required. When a brake is necessary, a brake-equipped model from the same family should be considered instead.

For high-speed packaging, indexing, feeding, material handling, positioning, assembly and other automated motion applications, the motor offers a useful combination of speed, torque capability and low-inertia response.

From a replacement perspective, the most important factors are not simply voltage and power. The keyless shaft, incremental feedback, no-brake configuration, 115 mm frame, 76.2 mm stack length and connector arrangement all need to match the existing machine.

In short, the MPL-B430P-HK72AA can be regarded as a 5000 rpm, 115 mm-frame, low-inertia servo motor with incremental encoder feedback, keyless shaft construction and no integrated brake, intended for demanding industrial motion applications where fast and repeatable movement is required.

29. Quick Reference Summary