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Allen-Bradley MPL-B1520U-VJ44AA Servo Motor – Complete Product Description and Technical Guide

1. Product Overview

The Allen-Bradley MPL-B1520U-VJ44AA is a premium low-inertia permanent-magnet rotary servo motor designed for high-speed and precision motion-control applications.

It belongs to the MPL family of low-inertia servo motors and is particularly suited to machinery where rapid acceleration, fast deceleration, accurate positioning, repeatable motion, and compact mechanical construction are important.

The MPL-B1520U-VJ44AA uses a 63 mm frame, a 50.8 mm magnetic stack, and a maximum rated speed of approximately 7000 rpm. The motor provides approximately 0.49 Nm continuous stall torque and approximately 0.27 kW rated output, making it a compact servo motor for relatively small but demanding motion axes.

A major feature of this particular model is its multi-turn high-resolution absolute encoder. Unlike a basic incremental feedback device, an absolute multi-turn feedback system can retain positional information across multiple revolutions, making it useful for applications where the controller needs reliable position information during startup and throughout machine operation.

The VJ44AA configuration also includes a 24 VDC holding brake. This makes the motor particularly useful for vertical axes, lifting mechanisms, positioning stages, and other applications where the load needs to be held when motor torque is removed.

The motor uses a keyed shaft and an IEC metric mounting arrangement. The standard configuration does not use a shaft seal.

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2. Brand and Product Series

Parameter	Description
Model	MPL-B1520U-VJ44AA
Brand	Allen-Bradley
Product family	MP-Series
Product series	MPL Low-Inertia Servo Motors
Motor type	Permanent-magnet rotary servo motor
Motor construction	Brushless AC servo motor
Motor design	Low inertia
Voltage class	460 V AC class
Frame size	63 mm
Magnetic stack	50.8 mm / 2.0 in
Maximum rated speed	7000 rpm
Rated output	Approximately 0.27 kW
Continuous stall torque	Approximately 0.49 Nm
Peak stall torque	Approximately 1.58 Nm
Feedback	Absolute multi-turn, high-resolution encoder
Shaft	Keyed shaft
Brake	24 VDC holding brake
Mounting	IEC metric flange
Connectors	Circular motor/feedback connector arrangement
Approx. dimensions	Approximately 66.5 × 63 × 182.3 mm
Approx. weight	Approximately 1.4 kg
Intended use	Precision industrial motion control

The exact mechanical envelope can vary slightly with revision and connector configuration, so the mechanical drawing should be checked before designing a close-clearance installation.

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3. Detailed Technical Parameters

Main Electrical and Mechanical Parameters

Parameter	Specification
Model	MPL-B1520U-VJ44AA
Brand	Allen-Bradley
Series	MPL Low-Inertia Servo Motor
Motor type	Permanent-magnet rotary servo
Electrical class	460 V AC
Nominal voltage class	400/460 V class
Phase	Three-phase AC
Rated output	Approximately 0.27 kW
Continuous stall torque	Approximately 0.49 Nm
Peak stall torque	Approximately 1.58 Nm
Continuous stall current	Approximately 1.8 A
Maximum speed	7000 rpm
Frame size	63 mm
Magnetic stack length	50.8 mm
Feedback	Absolute multi-turn high-resolution encoder
Encoder type	High-resolution absolute feedback
Shaft configuration	Keyed
Shaft seal	No shaft seal
Brake	24 VDC brake
Brake holding torque	Approximately 0.9 Nm
Mounting flange	IEC metric
Approx. body diameter / envelope	Approximately 66.5 mm
Approx. frame dimension	63 mm
Approx. overall length	Approximately 182.3 mm with brake configuration
Approx. weight	Approximately 1.4 kg
Construction	Low-inertia rotor design
Application class	Precision motion control
Duty	Continuous industrial operation

The basic electrical characteristics of the model are associated with the 0.49 Nm / 7000 rpm / 460 V configuration, while the VJ44AA suffix identifies the multi-turn feedback and brake configuration.

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4. Product Model Number Explanation

The model number MPL-B1520U-VJ44AA contains several pieces of useful configuration information.

Model Section	Meaning
MPL	MPL low-inertia permanent-magnet servo motor family
B	460 V-class motor family
15	63 mm frame class
20	50.8 mm magnetic stack length
U	7000 rpm speed class
V	Absolute multi-turn feedback
J	Keyed shaft configuration
44	24 VDC brake configuration
AA	Standard factory configuration

This coding arrangement is particularly useful when comparing similar MPL motors.

For example, the VJ42AA version is closely related to the VJ44AA, but the brake configuration is different. The VJ44AA version is the brake-equipped configuration.

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5. Motor Performance

The MPL-B1520U-VJ44AA is a relatively small servo motor, but its low-inertia construction allows it to respond quickly to changes in commanded speed and position.

Its approximately 0.49 Nm continuous stall torque makes it suitable for small machine axes where the mechanical load is moderate but the motion profile is demanding.

The motor can operate at speeds up to approximately 7000 rpm, which gives designers considerable speed capability for compact mechanisms.

The approximate 0.27 kW output rating places this motor in the small servo-motor category. It is not intended to replace larger motors where high continuous torque is required, but it is well suited to high-speed indexing, positioning, feeding, and compact automation mechanisms.

The motor’s low rotor inertia is particularly useful when the machine needs frequent changes in velocity. A low-inertia motor can help reduce the energy required to accelerate and decelerate the rotor itself, allowing the servo system to react quickly to changing motion commands.

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6. Absolute Multi-Turn Feedback

One of the most important characteristics of the MPL-B1520U-VJ44AA is its absolute multi-turn feedback system.

The feedback system provides the motion controller with information about motor position and rotation. The multi-turn capability is particularly useful when the mechanical axis travels through multiple motor revolutions.

This type of feedback can be valuable in machinery where accurate position information is important after startup, during repeated cycles, and during controlled machine movements.

Typical applications include:

• Precision indexing
• Servo-driven feeding systems
• Rotary positioning
• Packaging machinery
• Assembly equipment
• Material handling
• Pick-and-place mechanisms
• Small robotic mechanisms
• Electronic component handling
• Printing and labeling machinery
• Inspection systems
• Automated production machinery

The encoder also allows the drive system to continuously monitor motor movement and make corrections based on actual rotor position.

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7. 24 VDC Brake

The VJ44AA configuration includes a 24 VDC holding brake.

The brake is an important distinction between the VJ44AA and the corresponding VJ42AA configuration.

The brake is primarily intended as a holding device rather than as the normal method of stopping a rapidly moving load.

In a vertical-axis application, for example, the servo motor may need to maintain position while energized. If power is removed, the brake can provide mechanical holding capability.

This makes the brake-equipped version particularly useful for:

• Vertical lifting axes
• Z-axis mechanisms
• Small elevators
• Vertical slides
• Height-adjustment mechanisms
• Loading mechanisms
• Positioning tables
• Gravity-loaded machine axes

The brake is rated around 0.9 Nm holding torque in the referenced configuration.

When applying the brake, the machine designer should consider the actual load torque, acceleration, stopping method, safety requirements, brake wear, and whether the brake is being used for holding or dynamic stopping.

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8. Shaft and Mechanical Construction

The MPL-B1520U-VJ44AA uses a keyed shaft.

The keyed shaft is useful where the motor is connected to a pulley, coupling, gearbox, sprocket, or other mechanical transmission component that requires positive torque transfer.

A keyed shaft can also simplify mechanical assembly when the machine design uses conventional keyed hubs and couplings.

The motor uses a compact frame arrangement with a nominal 63 mm frame size and a 50.8 mm magnetic stack.

The relatively compact construction allows the motor to be installed in machines where available cabinet or machine-space dimensions are limited.

For the brake version, the overall motor length is greater than the corresponding non-brake version because additional space is required for the brake assembly.

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9. Approximate Dimensions

The following values are useful for preliminary mechanical planning.

Dimension	Approximate Value
Model	MPL-B1520U-VJ44AA
Frame dimension	63 mm
Approx. maximum body/envelope diameter	66.5 mm
Magnetic stack length	50.8 mm
Approx. pilot diameter	40 mm class
Approx. overall motor length	182.3 mm
Shaft configuration	Keyed
Shaft key	Approximately 3 × 3 × 14 mm
Mounting style	IEC metric flange
Approx. weight	1.4 kg
Brake	Included
Brake voltage	24 VDC

These dimensions should be treated as preliminary engineering values. For a new machine design, the exact dimensional drawing for the specific motor revision should be used.

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10. Product Introduction

The Allen-Bradley MPL-B1520U-VJ44AA is designed around the requirements of high-speed industrial motion control.

The motor combines a compact 63 mm frame with a 50.8 mm magnetic stack and a low-inertia rotor design. This combination provides a useful balance between physical size, speed, torque, and dynamic response.

The 7000 rpm speed capability is one of the main characteristics of this motor.

Instead of being optimized solely for high torque, the motor is intended for applications where the axis must move quickly and repeatedly.

The multi-turn absolute encoder provides detailed position feedback to the servo control system, while the 24 VDC brake adds a mechanical holding function for applications that require it.

This combination makes the MPL-B1520U-VJ44AA particularly suitable for compact automated machines with demanding positioning requirements.

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11. Main Advantages

11.1 Low-Inertia Design

The low-inertia construction is one of the key advantages of the MPL series.

Lower rotor inertia allows the servo system to accelerate and decelerate the motor quickly.

This is valuable for machines that perform repeated short movements rather than long, slow movements.

Examples include indexing machines, feeders, pick-and-place systems, cutting mechanisms, packaging equipment, and assembly equipment.

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11.2 High-Speed Operation

The motor is designed for a maximum speed of approximately 7000 rpm.

This provides the ability to achieve high mechanical speed while maintaining servo-based control.

High speed can be particularly useful when the motor drives a mechanical transmission, pulley, lead screw, belt system, or other mechanism where the motor needs to rotate considerably faster than the final machine movement.

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11.3 Multi-Turn Absolute Feedback

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

This is useful when the application requires accurate position tracking and repeatable motion.

It also provides a significant advantage over basic open-loop motor operation because the control system can compare commanded motion with actual motor position.

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11.4 Integrated Holding Brake

The 24 VDC brake is useful for applications where the axis must remain mechanically held when motor power is removed.

This can simplify machine design for vertical or gravity-loaded axes.

The brake also provides an additional mechanical holding function that can complement the servo drive’s electronic control.

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11.5 Compact Mechanical Size

A 63 mm frame is relatively compact for a servo motor capable of approximately 7000 rpm.

This makes the motor suitable for machines where installation space is limited.

The compact format is particularly useful in multi-axis machines where several motors must be installed close to each other.

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11.6 Keyed Shaft

The keyed shaft provides a conventional mechanical interface.

This is useful when connecting the motor to standard keyed couplings, pulleys, gearboxes, or other mechanical components.

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11.7 Good Dynamic Response

The combination of low inertia, high speed, and high-resolution feedback makes this motor suitable for applications that require frequent speed and position changes.

The servo drive can use feedback from the encoder to continuously regulate the motor.

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12. Typical Applications

Packaging Machinery

The MPL-B1520U-VJ44AA can be used for packaging mechanisms where products or packaging material must be positioned accurately.

Typical duties can include:

• Film feeding
• Product indexing
• Label positioning
• Cutter positioning
• Small conveyor synchronization
• Sealing mechanism positioning

The high-speed capability is useful when machine cycle time is important.

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Assembly Machinery

Automated assembly machines often require compact servo motors to move components between precise locations.

The motor can be used for:

• Component positioning
• Rotary indexing
• Press positioning
• Part feeding
• Tool positioning
• Small linear axes

The absolute feedback system can help maintain accurate positional control.

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Material Handling

Small automated material-handling systems can use the motor for controlled movement of trays, fixtures, belts, and positioning mechanisms.

The brake version is especially useful when the axis has a vertical component.

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Pick-and-Place Equipment

Pick-and-place systems require rapid acceleration, deceleration, and positioning.

The low-inertia motor design is well suited to repeated short-cycle movements.

It can be used for rotary or linear mechanisms depending on the mechanical transmission.

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Vertical Positioning Systems

The integrated 24 VDC brake makes the motor useful for vertical axes.

Examples include:

• Z-axis slides
• Vertical lifting stages
• Small lifting mechanisms
• Height-adjustment systems
• Vertical positioning platforms

The brake provides holding capability when the motor is de-energized.

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Printing and Labeling Machinery

Printing and labeling systems often require accurate synchronization between rollers, feeders, and positioning mechanisms.

The motor’s speed capability and feedback system can support these applications.

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Inspection Machinery

Automated inspection machines frequently use servo motors to move cameras, fixtures, inspection heads, or components.

The MPL-B1520U-VJ44AA can be applied where a compact servo motor is required for repeatable positioning.

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13. Related Models – Same Series

The following five models are closely related to the MPL-B1520U-VJ44AA and are useful when comparing feedback type, brake configuration, speed, or motor capacity.

Model	Voltage	Frame	Stack	Speed	Torque	Feedback	Brake	Approx. Dimensions	Approx. Weight
MPL-B1520U-VJ42AA	460 V AC	63 mm	50.8 mm	7000 rpm	0.49 Nm	Absolute multi-turn	No	Approx. 66.5 × 63 × 146.2 mm	Approx. 1.2 kg
MPL-B1520U-EJ42AA	460 V AC	63 mm	50.8 mm	7000 rpm	0.49 Nm	Absolute single-turn	No	Approx. 66.5 × 63 × 146.2 mm	Approx. 1.2 kg
MPL-B1520U-EJ44AA	460 V AC	63 mm	50.8 mm	7000 rpm	0.49 Nm	Absolute single-turn	24 VDC	Approx. 66.5 × 63 × 182.3 mm	Approx. 1.4 kg
MPL-B1520U-HJ42AA	460 V AC	63 mm	50.8 mm	7000 rpm	0.49 Nm	Incremental	No	Approx. 66.5 × 63 × 146.2 mm	Approx. 1.2 kg
MPL-B1530U-VJ42AA	460 V AC	63 mm	76.2 mm	7000 rpm	0.90 Nm	Absolute multi-turn	No	Approx. 63 mm frame; approx. 171 mm motor length	Approx. 1.6 kg

The B1520U variants share the same basic 63 mm frame and 50.8 mm stack. The major differences are feedback type and brake configuration. The B1530U increases the magnetic stack length and torque capability while retaining the 7000 rpm class.

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14. Same-Series Comparison

MPL-B1520U-VJ44AA vs MPL-B1520U-VJ42AA

These two models are extremely similar.

The primary difference is the brake configuration.

Parameter	MPL-B1520U-VJ44AA	MPL-B1520U-VJ42AA
Voltage	460 V class	460 V class
Frame	63 mm	63 mm
Stack	50.8 mm	50.8 mm
Speed	7000 rpm	7000 rpm
Continuous torque	0.49 Nm	0.49 Nm
Feedback	Multi-turn absolute	Multi-turn absolute
Shaft	Keyed	Keyed
Brake	24 VDC	No brake
Approx. dimensions	66.5 × 63 × 182.3 mm	66.5 × 63 × 146.2 mm
Approx. weight	1.4 kg	1.2 kg

The VJ44AA is therefore more appropriate where a holding brake is required, while the VJ42AA is the corresponding non-brake configuration.

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15. MPL-B1520U-VJ44AA vs MPL-B1520U-EJ44AA

Both models have a brake and share the same basic motor size.

The primary difference is the feedback arrangement.

Parameter	MPL-B1520U-VJ44AA	MPL-B1520U-EJ44AA
Frame	63 mm	63 mm
Stack	50.8 mm	50.8 mm
Speed	7000 rpm	7000 rpm
Torque	0.49 Nm	0.49 Nm
Feedback	Absolute multi-turn	Absolute single-turn
Shaft	Keyed	Keyed
Brake	24 VDC	24 VDC
Approx. dimensions	66.5 × 63 × 182.3 mm	66.5 × 63 × 182.3 mm
Approx. weight	1.4 kg	1.4 kg

The VJ44AA provides multi-turn absolute feedback, while the EJ44AA uses the single-turn absolute configuration.

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16. MPL-B1520U-VJ44AA vs MPL-B1530U-VJ42AA

The B1530U is the higher-torque member of this small 63 mm-frame group.

Parameter	MPL-B1520U-VJ44AA	MPL-B1530U-VJ42AA
Frame	63 mm	63 mm
Stack	50.8 mm	76.2 mm
Speed	7000 rpm	7000 rpm
Continuous torque	0.49 Nm	0.90 Nm
Feedback	Absolute multi-turn	Absolute multi-turn
Brake	24 VDC	No brake
Approx. weight	1.4 kg	1.6 kg
Approx. dimensions	Approx. 66.5 × 63 × 182.3 mm	Approx. 63 mm frame, longer body
Typical role	Compact high-speed axis	Higher-torque compact axis

When additional continuous torque is required, the B1530U provides a larger magnetic stack while retaining the same general high-speed motor concept.

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17. Five Popular Same-Brand Models

The following five models are useful comparison models from the same Allen-Bradley MPL servo-motor family.

Model	Voltage	Output / Torque	Speed	Feedback	Brake	Frame	Approx. Dimensions	Approx. Weight
MPL-B1510V-VJ42AA	460 V	0.26 Nm	8000 rpm	Absolute multi-turn	No	63 mm	Approx. 66.5 × 63 × 133.2 mm	Approx. 1.0 kg
MPL-B210V-VJ42AA	460 V	0.55 Nm	8000 rpm	Absolute multi-turn	No	75 mm	Approx. 74–79 × 75 × 137 mm	Approx. 1.4 kg
MPL-B220T-VJ42AA	460 V	1.61 Nm	6000 rpm	Absolute multi-turn	No	75 mm	Approx. 74 × 75 × 163 mm	Approx. 2.0 kg
MPL-B320P-MK22AA	460 V class	Approx. 1.4 kW	5000 rpm	Absolute multi-turn	Configuration dependent	100 mm class	Approx. 100 mm frame; larger envelope	Approx. 3.7 kg
MPL-B330P-MK22AA	460 V class	Approx. 1.8 kW	5000 rpm	Absolute multi-turn	Configuration dependent	100 mm class	Approx. 100 mm frame; larger envelope	Approx. 4.6 kg

These models cover a broader range of motor sizes, from the compact B1510V through higher-torque B220T and larger B320P/B330P motors. The B1510V is a smaller, higher-speed option, while the B220T provides considerably more torque.

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18. MPL-B1510V-VJ42AA

The MPL-B1510V-VJ42AA is a smaller motor within the same general low-inertia family.

Its maximum speed is approximately 8000 rpm, higher than the B1520U.

Its continuous stall torque is approximately 0.26 Nm, so it is intended for lighter mechanical loads.

Parameter	Specification
Model	MPL-B1510V-VJ42AA
Voltage	460 V class
Frame	63 mm
Stack	25.4 mm
Speed	8000 rpm
Continuous stall torque	Approx. 0.26 Nm
Output	Approx. 0.16 kW
Feedback	Absolute multi-turn
Brake	No
Shaft	Keyed
Approx. dimensions	66.5 × 63 × 133.2 mm
Approx. weight	1.0 kg

This model is useful when the application requires very high speed but less torque.

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19. MPL-B210V-VJ42AA

The MPL-B210V-VJ42AA provides a larger frame than the B1520U and remains in the high-speed servo category.

Parameter	Specification
Model	MPL-B210V-VJ42AA
Voltage	460 V class
Frame	75 mm class
Stack	25.4 mm
Speed	8000 rpm
Continuous stall torque	Approx. 0.55 Nm
Peak torque	Approx. 1.50 Nm
Feedback	Absolute multi-turn
Brake	No
Shaft	Keyed
Approx. dimensions	Approx. 74–79 × 75 × 137 mm
Approx. weight	1.4 kg

It is a useful comparison where the B1520U’s 0.49 Nm torque is close to the application’s requirement but a somewhat larger motor platform is acceptable.

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20. MPL-B220T-VJ42AA

The MPL-B220T-VJ42AA is designed for substantially higher torque than the B1520U.

Parameter	Specification
Model	MPL-B220T-VJ42AA
Voltage	460 V class
Frame	75 mm class
Stack	50.8 mm
Speed	6000 rpm
Continuous stall torque	Approx. 1.61 Nm
Output	Approx. 0.62 kW
Feedback	Absolute multi-turn
Brake	No
Shaft	Keyed
Approx. dimensions	Approx. 74 × 75 × 163 mm
Approx. weight	2.0 kg

Compared with the B1520U, the B220T provides substantially more torque, although its maximum speed is lower.

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21. MPL-B320P-MK22AA

The MPL-B320P-MK22AA belongs to a larger motor class.

It is appropriate when the required mechanical load is considerably greater than what a small 63 mm frame motor can provide.

Parameter	Specification
Model	MPL-B320P-MK22AA
Voltage	460 V class
Motor family	MPL servo
Frame	Approximately 100 mm class
Speed	Approximately 5000 rpm
Output	Approximately 1.4 kW
Feedback	Absolute multi-turn
Approx. dimensions	Approximately 100 mm frame; larger overall envelope
Approx. weight	3.7 kg
Application	Medium-duty precision motion

This motor is physically larger and significantly more powerful than the B1520U.

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22. MPL-B330P-MK22AA

The MPL-B330P-MK22AA is another larger MPL motor designed for applications requiring greater output.

Parameter	Specification
Model	MPL-B330P-MK22AA
Voltage	460 V class
Motor family	MPL servo
Frame	Approximately 100 mm class
Speed	Approximately 5000 rpm
Output	Approximately 1.8 kW
Feedback	Absolute multi-turn
Approx. dimensions	Approximately 100 mm frame; larger overall envelope
Approx. weight	4.6 kg
Application	Medium-duty and higher-load motion control

Compared with the B1520U, the B330P is intended for a completely different load range and should be considered when a larger motor is required.

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23. Why Choose the MPL-B1520U-VJ44AA?

The MPL-B1520U-VJ44AA is especially attractive when the machine needs a combination of:

• Compact size
• High rotational speed
• Low rotor inertia
• Accurate servo feedback
• Multi-turn position information
• Keyed mechanical connection
• Integrated 24 VDC holding brake
• Approximately 0.49 Nm continuous stall torque
• Approximately 0.27 kW output
• 63 mm frame construction

It is therefore well suited to compact motion-control axes rather than heavy-load servo applications.

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24. Main Advantages in Practical Machine Design

Compact Installation

The 63 mm frame allows the motor to fit into relatively small machine spaces.

Fast Response

Low rotor inertia allows rapid acceleration and deceleration.

High-Speed Capability

The 7000 rpm speed class provides substantial speed headroom for compact mechanisms.

Accurate Position Feedback

The multi-turn absolute encoder supports precise motion control and position monitoring.

Vertical-Axis Support

The 24 VDC brake provides useful holding capability for vertical mechanisms.

Conventional Shaft Interface

The keyed shaft makes mechanical coupling straightforward for many industrial machine designs.

Flexible Application Range

The motor can be used in packaging, assembly, indexing, material handling, inspection, and other automated machinery.

Reduced Mechanical Footprint

The motor provides servo functionality without requiring the physical space associated with larger servo motors.

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25. Important Installation Considerations

When installing the MPL-B1520U-VJ44AA, several points should be considered.

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

The shaft should be correctly aligned with the driven mechanism. Excessive radial or axial loading can shorten bearing life.

The brake should not normally be treated as a substitute for the servo drive’s controlled stopping function. It is primarily a holding mechanism.

The encoder wiring should be installed according to the control-system requirements, with attention to cable routing and electrical noise.

Motor and feedback cables should be routed in a way that minimizes unwanted electrical interference.

The mechanical coupling should be properly balanced and aligned.

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26. Maintenance Considerations

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

Recommended checks include:

• Inspecting motor mounting bolts
• Checking shaft coupling condition
• Checking for abnormal vibration
• Checking motor temperature
• Inspecting connector condition
• Checking encoder feedback stability
• Inspecting brake operation
• Checking for unusual mechanical noise
• Checking cable condition
• Confirming correct servo tuning

If a vertical axis is involved, the brake should receive particular attention because brake performance directly affects the ability of the axis to remain mechanically held.

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27. Replacement and Selection Considerations

When replacing an MPL-B1520U-VJ44AA, the replacement motor should not be selected only by physical size.

The following parameters should be checked:

1. Voltage class
2. Continuous torque
3. Peak torque
4. Maximum speed
5. Feedback type
6. Multi-turn or single-turn requirement
7. Brake requirement
8. Shaft configuration
9. Mounting flange
10. Connector arrangement
11. Motor dimensions
12. Motor weight
13. Drive compatibility
14. Cable compatibility
15. Machine inertia
16. Mechanical load
17. Required acceleration
18. Required deceleration
19. Vertical-axis requirements

A motor that physically fits the machine may still be unsuitable if the encoder, brake, voltage class, or torque characteristics do not match the existing control system.

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28. Quick Comparison of Five Related Models

Model	Main Difference	Speed	Continuous Torque	Feedback	Brake	Approx. Weight
MPL-B1520U-VJ42AA	Same motor without brake	7000 rpm	0.49 Nm	Multi-turn absolute	No	1.2 kg
MPL-B1520U-EJ42AA	Single-turn feedback	7000 rpm	0.49 Nm	Single-turn absolute	No	1.2 kg
MPL-B1520U-EJ44AA	Single-turn + brake	7000 rpm	0.49 Nm	Single-turn absolute	24 VDC	1.4 kg
MPL-B1520U-HJ42AA	Incremental feedback	7000 rpm	0.49 Nm	Incremental	No	1.2 kg
MPL-B1530U-VJ42AA	Higher torque	7000 rpm	0.90 Nm	Multi-turn absolute	No	1.6 kg

The related model configurations and their basic feedback/brake distinctions are documented across the MPL model listings.

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29. Overall Technical Summary

Parameter	MPL-B1520U-VJ44AA
Model	MPL-B1520U-VJ44AA
Brand	Allen-Bradley
Series	MPL Low-Inertia Servo Motors
Motor technology	Permanent-magnet AC servo
Voltage class	460 V AC
Frame	63 mm
Stack length	50.8 mm
Rated output	Approx. 0.27 kW
Continuous stall torque	Approx. 0.49 Nm
Peak stall torque	Approx. 1.58 Nm
Maximum speed	7000 rpm
Feedback	Absolute multi-turn high-resolution encoder
Shaft	Keyed
Brake	24 VDC
Brake holding torque	Approx. 0.9 Nm
Mounting	IEC metric
Shaft seal	None
Approx. dimensions	66.5 × 63 × 182.3 mm
Approx. weight	1.4 kg
Motor design	Low inertia
Primary application	Precision industrial motion
Typical machines	Packaging, assembly, indexing, handling, inspection, positioning

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30. Final Product Description

The Allen-Bradley MPL-B1520U-VJ44AA is a compact, high-speed, low-inertia servo motor intended for precision industrial motion applications.

Its 63 mm frame, 50.8 mm magnetic stack, approximately 0.27 kW output, 0.49 Nm continuous stall torque, and 7000 rpm speed capability make it particularly suitable for compact machine axes where fast and repeatable motion is more important than very high continuous torque.

The integrated multi-turn absolute feedback system provides detailed position information for servo control, while the keyed shaft provides a conventional mechanical connection for couplings, pulleys, gearboxes, and other driven mechanisms.

The integrated 24 VDC brake is the major feature that distinguishes the MPL-B1520U-VJ44AA from the corresponding non-brake VJ42AA configuration. It provides mechanical holding capability and makes the motor particularly useful for vertical and gravity-loaded axes.

Overall, this motor is best regarded as a compact precision servo solution for high-speed automation. It is well suited to applications requiring accurate positioning, rapid acceleration and deceleration, multi-turn feedback, and mechanical holding in a relatively small installation space.

For machine builders, maintenance engineers, and replacement applications, the most important selection points are the 460 V-class electrical system, 7000 rpm speed, 0.49 Nm continuous stall torque, absolute multi-turn feedback, keyed shaft, 24 VDC brake, 63 mm frame, approximately 182.3 mm brake-version length, and approximately 1.4 kg motor weight.

The exact mechanical drawing and motor revision should always be checked before a direct replacement or new mechanical installation, especially where mounting clearances, connector orientation, shaft dimensions, brake wiring, and encoder compatibility are critical.