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MPL-B4540F-HJ72AA Low-Inertia Servo Motor

1. Product Overview

The MPL-B4540F-HJ72AA is a high-performance low-inertia rotary servo motor designed for demanding industrial motion-control applications. It belongs to the MPL family of low-inertia brushless servo motors and is built around a 130 mm metric flange frame with a 101.6 mm magnet stack.

This model is a 400 V class servo motor with a rated speed of 3000 rpm. It uses an incremental encoder for motor feedback and incorporates a keyed shaft for positive mechanical torque transmission.

The motor is supplied without an integral holding brake. This configuration makes it particularly suitable for machines where a motor brake is not required, or where the mechanical system already provides an independent holding or stopping mechanism.

The MPL-B4540F-HJ72AA is also equipped with a right-angle SpeedTEC DIN connector. The connector arrangement is useful in machine designs where available installation space around the motor is limited and where cable routing needs to be kept close to the motor body.

With a continuous output torque of approximately 10.2 N·m and a peak torque of approximately 27.1 N·m, this motor provides a useful combination of speed, torque, low rotor inertia, and responsive dynamic performance.

The model is especially well suited to automated machinery that requires repeated acceleration and deceleration, rapid positioning, coordinated rotary motion, and reliable servo feedback.

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2. Product Identification

Item	Specification
Model	MPL-B4540F-HJ72AA
Brand	Allen-Bradley
Product Family	MP-Series
Product Series	MPL Low-Inertia Servo Motors
Motor Type	Rotary Brushless Servo Motor
Voltage Class	400 V AC
Armature Voltage Class	460 V
Frame Size	45
Metric Frame Size	130 mm
Magnet Stack	40
Magnet Stack Length	101.6 mm
Rated Speed	3000 rpm
Maximum Speed	3000 rpm
Continuous Output Torque	10.2 N·m
Peak Output Torque	27.1 N·m
Continuous Rated Power	Approx. 2.6 kW
Feedback	Incremental Encoder
Feedback Resolution	2000 lines/revolution
Brake	No Brake
Shaft	Keyed Shaft
Shaft Seal	No Shaft Seal
Connector	SpeedTEC DIN
Connector Style	Right-Angle
Connector Rotation	180° Rotatable
Mounting	Metric Flange Mount
Frame Bolt Circle	130 mm class
Rotor Inertia	Approx. 0.00052 kg·m²
Approx. Product Weight	5.44 kg
Operating Temperature Range	Approx. 0 to 40 °C
Product Category	Servo Motor
Series Type	Low Inertia

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3. Dimensions and Weight

The physical construction of the MPL-B4540F-HJ72AA is based on a 130 mm metric servo motor frame with a 101.6 mm active magnet stack.

The 130 mm frame size is important when checking machine mounting compatibility. It determines the general flange size, mounting-hole arrangement, and mechanical envelope required for installation.

The 101.6 mm magnet stack is longer than the 76.2 mm stack used by many shorter MPL models. This longer stack allows the motor to provide a higher torque capability while maintaining the same general 130 mm frame class.

For machine planning, the following dimensions and weight information can be used as a practical reference.

Mechanical Parameter	Value
Model	MPL-B4540F-HJ72AA
Frame Size	130 mm
Frame Designation	Frame 45
Magnet Stack Length	101.6 mm
Flange Type	Metric flange
Mounting Pattern	130 mm frame class
Shaft Type	Keyed
Shaft Seal	No
Connector	Right-angle SpeedTEC DIN
Connector Orientation	Rotatable
Overall Motor Envelope	Determined by mechanical drawing and connector clearance
Approx. Weight	5.44 kg
Approx. Weight in Pounds	12 lb
Installation Consideration	Allow additional space for connector and cable routing

The approximately 5.44 kg motor weight is useful for machine-frame calculations, robotic-axis design, actuator mounting, and transportation planning.

The exact overall motor length should be checked against the mechanical drawing for the particular installation because the motor body, shaft projection, connector orientation, and cable-bending clearance all affect the actual required installation envelope.

For applications with a very restricted installation space, the connector direction should be considered together with the motor dimensions rather than looking only at the flange size.

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4. Series Information

The MPL-B4540F-HJ72AA belongs to the MPL Low-Inertia Servo Motor Series, within the broader MP-Series motion-control product family.

The MPL family was designed around brushless permanent-magnet servo technology and is intended for applications where accurate motion, rapid response, repeatability, and compact machine construction are important.

The low-inertia design is one of the main characteristics of the series. A low-inertia rotor can accelerate and decelerate rapidly, which is valuable in applications with frequent direction changes or short positioning cycles.

The MPL family is available in different frame sizes, stack lengths, feedback configurations, shaft configurations, brake options, and connector arrangements. This makes it possible to select a motor according to both the electrical requirements and the mechanical requirements of the machine.

The B4540F portion of the model designation identifies a particular motor size and construction within the family.

The HJ72AA suffix identifies the specific combination of feedback, shaft, brake, connector, and related configuration features.

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5. Model Configuration Explained

The model number is not simply a catalog identifier. It provides useful information about the motor configuration.

Model Section	General Meaning
MPL	Low-inertia servo motor family
B	Motor design/configuration family
45	Frame-size designation
40	101.6 mm magnet stack
F	3000 rpm / specific MPL motor configuration
H	Incremental encoder configuration
J	Keyed shaft configuration
72	No-brake / connector-related configuration
AA	Standard catalog configuration

The exact interpretation of individual characters should always be considered together with the complete catalog number because different characters can represent several configuration attributes within the MPL product structure.

For practical selection purposes, the most important characteristics of MPL-B4540F-HJ72AA are its 130 mm frame, 101.6 mm magnet stack, 3000 rpm operating speed, incremental encoder, keyed shaft, no-brake configuration, and right-angle SpeedTEC DIN connector.

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6. Main Technical Specifications

6.1 Motor Performance

The MPL-B4540F-HJ72AA provides approximately 10.2 N·m of continuous output torque and approximately 27.1 N·m of peak output torque.

This torque range makes the motor suitable for medium-duty servo axes where the load requires both sustained torque and short-duration acceleration torque.

The peak torque capability is particularly useful during acceleration, deceleration, indexing, rapid positioning, and short transient load conditions.

Performance Parameter	Specification
Model	MPL-B4540F-HJ72AA
Rated Speed	3000 rpm
Maximum Speed	3000 rpm
Continuous Torque	10.2 N·m
Peak Torque	27.1 N·m
Rated Power	Approx. 2.6 kW
Rotor Inertia	Approx. 0.00052 kg·m²
Motor Type	Low-inertia brushless servo
Voltage Class	400 V AC
Armature Voltage	460 V class

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7. Feedback System

The MPL-B4540F-HJ72AA uses an incremental encoder feedback system with a resolution of approximately 2000 lines per revolution.

The encoder provides the servo controller with information about motor position and rotational movement. This feedback is essential for closed-loop servo control.

Unlike an open-loop motor, a servo motor continuously operates with feedback from the motor to the controller. The controller can compare the commanded motion with the actual motor position and speed and then make corrections.

The 2000-line incremental encoder configuration provides useful feedback resolution for industrial positioning systems.

Typical applications include indexing mechanisms, rotary tables, material handling axes, machine-tool axes, packaging machinery, and other systems where accurate motor speed and position control are required.

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8. Keyed Shaft Design

The MPL-B4540F-HJ72AA uses a keyed shaft.

A keyed shaft provides a positive mechanical connection between the motor shaft and the driven component. Depending on the machine design, the key can be used with a suitable coupling, pulley, gearbox, sprocket, or other mechanical transmission component.

The keyed design is particularly useful in applications where the machine builder wants additional positive torque transmission between the shaft and the driven mechanism.

Compared with a keyless shaft, a keyed shaft can also be advantageous for certain traditional industrial machine designs where existing couplings or transmission components are already designed around keyed motor shafts.

The shaft should always be matched to the appropriate coupling and installation method. Proper alignment is important because excessive radial or axial loading can shorten bearing life and reduce overall motor reliability.

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9. No-Brake Configuration

One important characteristic of this model is the absence of an integral motor brake.

The no-brake configuration is suitable for applications where the load does not need to be mechanically held by the motor after power is removed.

It can also be appropriate when the machine has a separate mechanical braking mechanism or when the load is not capable of causing unwanted movement after servo power is removed.

Not having an integral brake can simplify the motor configuration and may reduce the amount of motor-side wiring associated with a brake circuit.

However, vertical-axis applications require special consideration. If the motor directly controls a suspended load, the absence of a holding brake means that an external safety or holding solution may be required depending on the machine design.

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10. SpeedTEC DIN Connector

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

The right-angle connector design can be useful where straight cable connections would increase the overall installation envelope.

The connector arrangement also supports more flexible cable routing. In compact machinery, this can make a significant difference because servo cables often need to travel through cable tracks, machine frames, protective conduits, or confined electrical compartments.

The connector is designed with rotational flexibility, allowing the cable exit direction to be adjusted to suit the machine layout.

This is particularly useful when several servo motors are installed close together or when cable routing needs to avoid moving machine components.

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11. Product Introduction

The MPL-B4540F-HJ72AA is essentially a medium-size, low-inertia servo motor intended for precise industrial motion.

Its combination of 130 mm frame size, 101.6 mm magnet stack, 3000 rpm speed, 10.2 N·m continuous torque, and 27.1 N·m peak torque gives it a balanced performance profile for industrial automation.

The motor is not intended simply to run at a constant speed like a conventional induction motor. Its main purpose is controlled motion.

In a servo system, the motor works together with a suitable servo drive, feedback system, controller, and mechanical load. The controller generates a motion command, the drive controls motor current, and the encoder provides feedback for closed-loop correction.

This arrangement allows the machine to perform accurate speed control, position control, acceleration control, deceleration control, and coordinated motion.

The low-inertia construction is particularly valuable in applications where the machine must repeatedly start, stop, reverse, or move between positions.

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12. Major Advantages

12.1 Low-Inertia Rotor Design

The low-inertia design is one of the most important advantages of the MPL family.

A lower rotor inertia allows the motor to respond quickly to changes in the commanded speed or position.

This is useful in applications with short machine cycles, frequent indexing, rapid acceleration, rapid deceleration, and repeated direction changes.

For example, a packaging machine may need to accelerate a mechanism, reach a target position, stop, reverse direction, and repeat the same sequence hundreds or thousands of times.

A low-inertia servo motor is well suited to this type of duty.

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12.2 Strong Torque Capability

With approximately 10.2 N·m of continuous torque and approximately 27.1 N·m of peak torque, the motor provides a useful amount of torque for its physical size.

The continuous torque rating is important for sustained mechanical loading, while the peak torque capability provides additional short-term capacity during acceleration and transient load conditions.

This combination allows the motor to handle both steady operating conditions and dynamic machine movements.

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12.3 3000 rpm Operating Speed

The 3000 rpm rated and maximum speed configuration makes the motor suitable for applications requiring relatively fast rotary motion.

The speed capability can be combined with a gearbox or other transmission system when the application requires higher torque at a lower machine speed.

Conversely, direct-drive arrangements may be possible when the machine load and torque requirements are compatible with the motor.

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12.4 High-Resolution Incremental Feedback

The 2000-line incremental encoder provides feedback to the servo system.

This enables the controller to monitor motor rotation and correct the motor command during operation.

The feedback system is particularly important for positioning applications where a conventional motor with simple speed control would not provide sufficient accuracy or dynamic response.

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12.5 Keyed Shaft

The keyed shaft provides a familiar mechanical interface for industrial machinery.

It is suitable for many standard mechanical transmission arrangements and can simplify integration into machines that already use keyed couplings and related components.

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12.6 Compact 130 mm Frame

The 130 mm metric frame provides a relatively compact mounting envelope for a motor capable of producing approximately 10.2 N·m continuous torque.

This is useful when machine builders need to balance motor performance against available cabinet, frame, and mechanical-axis space.

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12.7 Right-Angle Connector

The right-angle connector is another practical advantage.

In a crowded machine, cable routing can become a major design issue. A right-angle connector can help keep the cable closer to the motor body and reduce unnecessary protrusion.

The rotatable connector design provides additional flexibility during installation.

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12.8 No-Brake Simplicity

For applications that do not require a holding brake, the no-brake configuration can provide a simpler motor arrangement.

It avoids unnecessary brake wiring and allows the motor to be selected specifically for applications where mechanical holding is handled elsewhere.

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13. Typical Applications

The MPL-B4540F-HJ72AA can be considered for a broad range of industrial automation applications.

Packaging Machinery

Packaging machines frequently require high-speed indexing, rapid acceleration, precise positioning, and repetitive motion.

The low-inertia design and 3000 rpm operating speed make this motor suitable for mechanisms such as indexing systems, feed mechanisms, rotary packaging stations, film handling equipment, and product positioning axes.

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Conveyor and Material Handling Systems

Servo motors are useful in material handling systems when the machine needs more than simple constant-speed operation.

The motor can be used for controlled acceleration, synchronized movement, positioning, and coordinated conveyor motion.

Applications may include transfer systems, indexing conveyors, sorting mechanisms, and automated handling equipment.

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Machine Tools

The motor can be used in machine-tool motion systems where precise speed and position control are required.

Potential applications include auxiliary axes, indexing systems, rotary mechanisms, tool-positioning systems, and other servo-controlled machine movements.

The actual suitability depends on the load inertia, torque requirement, duty cycle, acceleration profile, and required accuracy.

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Printing Machinery

Printing equipment often requires precise synchronization between multiple rotating mechanisms.

Servo motors can be used to control rollers, feed mechanisms, positioning axes, and other motion elements.

The feedback system allows the motor to operate as part of a coordinated closed-loop motion system.

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Labeling Machines

Labeling systems frequently require accurate synchronization between product movement and label application.

A servo motor can provide controlled acceleration, positioning, and synchronized rotation.

The low-inertia design is useful where the machine repeatedly changes speed during the labeling cycle.

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Textile Machinery

Textile machines often have demanding speed-control requirements.

Servo motors can be used in winding, feeding, positioning, tension-control, and synchronized motion applications.

The exact motor selection should be based on the mechanical load, continuous torque requirement, peak torque requirement, and operating cycle.

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Automated Assembly Equipment

Automated assembly machines frequently use servo axes for component insertion, positioning, indexing, and transfer.

The MPL-B4540F-HJ72AA can be considered for medium-duty servo axes where fast response and repeatable motion are important.

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Rotary Indexing Equipment

Rotary indexing tables are a natural application for servo motors.

The motor can accelerate the table, move it to a defined position, decelerate, and hold the position under servo control.

The peak torque capability can be particularly useful during rapid indexing cycles.

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14. Application Suitability

Application	Suitability	Main Reason
Packaging equipment	Excellent	Fast response and precise positioning
Indexing machinery	Excellent	Low inertia and peak torque
Material handling	Very Good	Controlled acceleration and positioning
Assembly machines	Very Good	Closed-loop servo control
Labeling equipment	Very Good	Speed synchronization
Printing machinery	Very Good	Feedback-based motion control
Textile equipment	Good	Variable speed and positioning
Rotary tables	Excellent	Torque and positioning capability
Machine tools	Good	Servo feedback and 3000 rpm operation
General automation	Excellent	Flexible servo-axis application
Heavy lifting vertical axis	Requires careful design	No integral brake
Constant-speed fan/pump	Usually unnecessary	Servo capability may be excessive

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15. Important Selection Considerations

Selecting a servo motor should not be based only on rated power.

The motor must be evaluated against the actual mechanical load.

Important factors include:

• Continuous torque requirement
• Peak torque requirement
• Motor speed
• Load inertia
• Acceleration time
• Deceleration time
• Duty cycle
• Number of starts and stops
• Direction changes
• Gear ratio
• Coupling efficiency
• Radial shaft load
• Axial shaft load
• Ambient temperature
• Installation environment
• Cable routing
• Feedback compatibility
• Servo drive compatibility
• Holding-brake requirement

A motor that appears suitable based on power alone may not be appropriate if the load has a very high reflected inertia or requires unusually high acceleration torque.

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16. Five Same-Series or Closely Related Models

The following models are useful comparison choices when evaluating the MPL-B4540F-HJ72AA.

Model	Series / Type	Speed	Continuous Torque	Peak Torque	Feedback	Brake	Shaft	Magnet Stack	Approx. Weight
MPL-B4540F-HJ72AA	MPL Low Inertia	3000 rpm	10.2 N·m	27.1 N·m	2000-line incremental	No	Keyed	101.6 mm	5.44 kg
MPL-B4540F-HJ74AA	MPL Low Inertia	3000 rpm	Approx. 10.2 N·m	Approx. 27.1 N·m	Incremental encoder	24 V DC	Keyed	101.6 mm	Approx. 6 kg
MPL-B4540F-HK72AA	MPL Low Inertia	3000 rpm	Approx. 10.2 N·m	Approx. 27.1 N·m	High-resolution encoder	No	Keyed	101.6 mm	Approx. 5–6 kg
MPL-B4540F-HK74AA	MPL Low Inertia	3000 rpm	Approx. 10.2 N·m	Approx. 27.1 N·m	High-resolution encoder	24 V DC	Keyed	101.6 mm	Approx. 6 kg
MPL-B4530K-HJ72AA	MPL Low Inertia	4000 rpm	8.25 N·m	20.3 N·m	Incremental encoder	No	Keyed	76.2 mm	Approx. 4.5–5 kg

The most direct comparison is between the various MPL-B4540F configurations because they use the same basic frame and magnet-stack class while changing feedback and brake arrangements.

The MPL-B4530K-HJ72AA is a useful alternative when higher speed is more important than the additional torque provided by the longer B4540F motor.

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17. Comparison of the Five Related Models

MPL-B4540F-HJ72AA

This is the main model discussed in this document.

It combines a 3000 rpm operating speed, 10.2 N·m continuous torque, 27.1 N·m peak torque, incremental feedback, keyed shaft, and no brake.

It is a good choice when the application needs a conventional incremental feedback system and does not require a motor-mounted brake.

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MPL-B4540F-HJ74AA

The HJ74AA configuration is closely related to the HJ72AA but adds a 24 V DC motor brake.

This makes it more appropriate for applications where the motor needs to provide a holding function when servo power is removed.

It can be particularly useful in vertical or gravity-loaded mechanisms, although the machine safety design must determine whether a motor brake alone is sufficient.

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MPL-B4540F-HK72AA

The HK72AA configuration is another closely related B4540F motor but uses a higher-resolution feedback arrangement.

This can be considered when the control system benefits from more detailed position feedback than the standard incremental configuration.

It remains a no-brake configuration, so the same considerations concerning vertical loads and mechanical holding apply.

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MPL-B4540F-HK74AA

This configuration combines higher-resolution feedback with a 24 V DC brake.

It is therefore a useful choice for applications that need both enhanced feedback capability and motor-mounted holding capability.

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MPL-B4530K-HJ72AA

This model belongs to the same general MPL low-inertia family but uses a shorter magnet stack and a higher 4000 rpm speed class.

It is useful when the application prioritizes speed and dynamic response over the higher continuous torque available from the B4540F configuration.

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18. Five Popular or Widely Used Related Models Under the Same Brand

The following models are useful for broader comparison when selecting motion-control equipment. They are not all direct replacements for the MPL-B4540F-HJ72AA; some represent different motor configurations or related motion-control products.

Model	Product Type	Typical Configuration	Speed / Rating	Torque / Capacity	Feedback / Function	Dimensions	Approx. Weight
MPL-B4530K-HK72AA	Servo Motor	Low inertia, high-resolution, no brake	4000 rpm	8.25 N·m continuous	High-resolution encoder	130 mm frame × 76.2 mm stack	Approx. 10 kg
MPL-B4530K-HK74AA	Servo Motor	Low inertia, high-resolution, brake	4000 rpm	8.25 N·m continuous	High-resolution encoder	130 mm frame × 76.2 mm stack	Approx. 10 kg
MPL-B4530K-SK74AA	Servo Motor	Low inertia, single-turn feedback, brake	4000 rpm	Approx. 8.25 N·m continuous	High-resolution single-turn	130 mm frame × 76.2 mm stack	Approx. 10 kg
MPL-B4540F-HK74AA	Servo Motor	Low inertia, high-resolution, brake	3000 rpm	Approx. 10.2 N·m continuous	High-resolution encoder	130 mm frame × 101.6 mm stack	Approx. 6 kg
MPL-B4560F-HJ72AA	Servo Motor	Low inertia, incremental, no brake	3000 rpm	Approx. 14.1 N·m continuous	Incremental encoder	130 mm frame × 152.4 mm stack class	Approx. 5–6 kg

The exact weight of a motor can vary depending on the configuration and the method used for measurement. For engineering work, the mechanical drawing and the final product documentation should be used for the final machine weight calculation.

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19. Broader Model Selection Guide

Requirement	Recommended Configuration
Need standard incremental feedback	MPL-B4540F-HJ72AA
Need motor-mounted brake	MPL-B4540F-HJ74AA
Need higher-resolution feedback	MPL-B4540F-HK72AA
Need higher-resolution feedback plus brake	MPL-B4540F-HK74AA
Need higher motor speed	MPL-B4530K series
Need more continuous torque	MPL-B4560F series
Need a vertical-axis holding function	Brake-equipped model should be considered
Need a compact high-response axis	MPL low-inertia family
Need conventional keyed transmission	J-type keyed-shaft configuration
Need no integral brake	HJ72AA-type configuration

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20. Advantages for Machine Builders

For machine builders, one of the most useful characteristics of the MPL-B4540F-HJ72AA is its balance between motor size and dynamic performance.

The 130 mm frame does not require an excessively large mechanical mounting structure, while the 101.6 mm magnet stack provides approximately 10.2 N·m of continuous torque.

The low-inertia rotor also makes the motor suitable for repetitive servo cycles.

A machine that repeatedly accelerates and decelerates the motor can benefit from the low-inertia construction because less energy is required to change the rotational state of the motor itself.

This can improve the dynamic behavior of the complete servo axis when the mechanical load is correctly matched to the motor.

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21. Advantages for Maintenance

The standard industrial motor construction and conventional keyed shaft make the MPL-B4540F-HJ72AA relatively straightforward to integrate into established machine architectures.

The SpeedTEC DIN connector also provides a practical connection arrangement for industrial servo cabling.

When servicing a machine, maintenance personnel should inspect the motor mounting, shaft coupling, connector, cables, encoder feedback, and bearing condition.

Unusual vibration, increased noise, excessive temperature, unstable servo performance, or repeated encoder faults should be investigated rather than simply replacing the motor.

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22. Installation Considerations

Correct mechanical installation is essential for reliable servo motor operation.

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

The coupling should be correctly aligned with the driven shaft.

Excessive radial or axial shaft loading should be avoided.

The motor should not be used as a structural support for components that impose loads beyond the permissible shaft loading.

Cable routing is also important. Servo cables should be protected against excessive bending, crushing, abrasion, and repeated mechanical stress.

Because this model uses a right-angle connector, the connector orientation should be planned before the motor is permanently mounted.

Adequate clearance should be provided around the connector so that the cable can be connected and serviced without putting mechanical stress on the connector.

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23. Environmental Considerations

The MPL-B4540F-HJ72AA is intended for industrial motion-control environments, but the actual machine environment should always be evaluated.

Temperature, humidity, dust, oil, vibration, shock, chemical exposure, and washdown requirements can all affect motor selection.

This particular configuration does not use a shaft seal, so applications with significant exposure to liquids, dust, or contamination should receive additional mechanical consideration.

If the machine operates in a harsh environment, the motor’s environmental protection requirements should be compared with the actual installation conditions.

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24. Servo Drive Compatibility

A servo motor cannot normally be evaluated independently of its drive.

The drive must be compatible with the motor’s voltage class, feedback type, motor identification, current requirements, and control architecture.

The MPL-B4540F-HJ72AA is associated with several motion-control drive families used with MPL servo motors.

The exact drive selection should be based on the complete motor data rather than simply matching the motor’s kW rating.

The drive must also be able to process the incremental encoder feedback and provide the required motor current during both continuous and peak operating conditions.

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25. Recommended Use Cases

The MPL-B4540F-HJ72AA is particularly attractive when the machine requires:

• 3000 rpm operation
• Approximately 10.2 N·m continuous torque
• Approximately 27.1 N·m peak torque
• Low rotor inertia
• Incremental encoder feedback
• Keyed shaft transmission
• No integral brake
• 130 mm metric frame
• 101.6 mm magnet stack
• Right-angle servo connector
• Closed-loop speed and position control

It is less attractive when the application specifically requires an integral holding brake or a higher-speed 4000 rpm configuration.

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26. Main Product Advantages at a Glance

Advantage	Practical Benefit
Low-inertia design	Fast acceleration and deceleration
3000 rpm speed	Suitable for relatively fast machine cycles
10.2 N·m continuous torque	Good continuous load capability
27.1 N·m peak torque	Strong short-duration acceleration capability
2000-line encoder	Closed-loop position and speed feedback
Keyed shaft	Positive mechanical torque transmission
130 mm frame	Compact industrial mounting format
101.6 mm magnet stack	Higher torque capability than shorter-stack models
Right-angle connector	Easier cable routing in compact machines
Rotatable connector	Greater installation flexibility
No brake	Simple configuration where holding is unnecessary
MPL low-inertia platform	Suitable for dynamic automation applications

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27. Technical Summary

The MPL-B4540F-HJ72AA is a 400 V class, 130 mm-frame low-inertia rotary servo motor designed for industrial motion-control systems.

Its 101.6 mm magnet stack, 3000 rpm speed, approximately 10.2 N·m continuous torque, and approximately 27.1 N·m peak torque give it a useful performance range for medium-duty dynamic servo applications.

The 2000-line incremental encoder provides feedback for closed-loop servo operation.

The keyed shaft provides a conventional mechanical interface, while the right-angle SpeedTEC DIN connector allows flexible cable routing.

The absence of an integral brake makes the model best suited to applications where mechanical holding is not required or where a separate holding mechanism is used.

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28. Quick Reference Specification Table

Parameter	MPL-B4540F-HJ72AA
Model	MPL-B4540F-HJ72AA
Brand	Allen-Bradley
Series	MPL Low-Inertia Servo Motor
Product Family	MP-Series
Motor Type	Rotary Brushless Servo Motor
Voltage Class	400 V AC
Armature Voltage	460 V class
Frame Size	45 / 130 mm
Magnet Stack	40
Magnet Stack Length	101.6 mm
Rated Speed	3000 rpm
Maximum Speed	3000 rpm
Continuous Torque	10.2 N·m
Peak Torque	27.1 N·m
Continuous Power	Approx. 2.6 kW
Feedback	Incremental Encoder
Encoder Resolution	2000 lines/revolution
Brake	No Brake
Shaft	Keyed
Shaft Seal	No
Connector	SpeedTEC DIN
Connector Type	Right Angle
Connector Rotation	180° Rotatable
Mounting	Metric Flange
Frame Size	130 mm
Magnet Stack	101.6 mm
Rotor Inertia	Approx. 0.00052 kg·m²
Dimensions	130 mm frame × 101.6 mm magnet-stack class; exact overall envelope depends on mechanical configuration
Weight	Approx. 5.44 kg
Application	Industrial servo motion control
Series Category	Low-Inertia Servo

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29. Final Product Assessment

The MPL-B4540F-HJ72AA is a practical choice for industrial servo applications that require a combination of moderate-to-high continuous torque, strong peak torque, 3000 rpm operation, rapid dynamic response, and reliable incremental feedback.

Its low-inertia construction makes it particularly useful for machines with repeated acceleration and deceleration cycles.

The 101.6 mm magnet stack gives the motor more torque capability than shorter MPL configurations, while the 130 mm frame maintains a familiar industrial mounting format.

The keyed shaft is well suited to conventional industrial transmission systems, and the right-angle connector provides useful flexibility for cable routing.

The main point to consider during selection is the no-brake configuration. If the application includes a vertical load, suspended mechanism, or any situation where the load must remain mechanically stationary after servo power is removed, a brake-equipped configuration or separate mechanical holding solution should be evaluated.

Overall, the MPL-B4540F-HJ72AA is best viewed as a low-inertia, 3000 rpm, 130 mm-frame industrial servo motor with incremental encoder feedback, keyed shaft, 101.6 mm magnet stack, and no integral brake, making it well suited to packaging, indexing, assembly, material handling, printing, machine-tool, and general factory-automation applications.