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Allen-Bradley MPL-B1520U-VJ72AA Servo Motor

1. Product Overview

The Allen-Bradley MPL-B1520U-VJ72AA is a compact, high-speed, low-inertia permanent-magnet servo motor designed for precision industrial motion-control applications.

It belongs to the MPL low-inertia servo motor series and uses a 63 mm frame with a 50.8 mm magnetic stack. The motor is designed for a 460 V-class AC supply and has a rated speed of approximately 7000 rpm.

The motor uses a multi-turn high-resolution absolute encoder, allowing the servo control system to monitor motor position accurately over multiple revolutions. The keyed shaft provides a conventional mechanical connection for couplings, pulleys, gear mechanisms, and other driven components.

An important characteristic of the VJ72AA configuration is that it does not include a holding brake. The model uses a SpeedTEC DIN connector arrangement with a right-angle configuration that can be rotated for convenient cable positioning.

The motor is particularly suitable for compact automated machinery where fast acceleration, rapid positioning, repeatability, and a relatively small mechanical footprint are important.

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2. Brand and Series

Parameter	Specification
Model	MPL-B1520U-VJ72AA
Brand	Allen-Bradley
Product family	MP-Series
Product series	MPL Low-Inertia Servo Motors
Motor type	Brushless AC permanent-magnet servo motor
Design	Low-inertia
Voltage class	460 V AC
Frame size	63 mm
Magnetic stack length	50.8 mm / 2.0 in
Rated speed	7000 rpm
Feedback	Multi-turn high-resolution absolute encoder
Shaft	Keyed shaft extension
Brake	No brake
Connector	SpeedTEC DIN, right-angle type
Connector orientation	180° rotatable
Mounting	IEC metric
Mounting-hole style	Free mounting holes, Type FF
Shaft seal	No shaft seal
Approx. weight	1.05 kg
Approx. motor envelope	Approximately 66.5 × 63 × 146.2 mm
Main application	Precision industrial motion control

The published product configuration identifies the B1520U motor as a 63 mm frame, 50.8 mm stack, 7000 rpm motor with multi-turn absolute feedback, keyed shaft, SpeedTEC DIN connector, and no brake.

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3. Detailed Technical Parameters

Parameter	MPL-B1520U-VJ72AA Specification
Model	MPL-B1520U-VJ72AA
Motor category	Rotary servo motor
Motor technology	Permanent-magnet AC servo
Series	MPL Low-Inertia
Voltage	460 V AC class
Voltage classification	400/460 V class
Number of phases	3-phase
Rated output	Approx. 0.27 kW
Rated speed	7000 rpm
Continuous stall torque	Approx. 0.49 Nm
Peak stall torque	Approx. 1.58 Nm
Frame size	63 mm
Magnetic stack	50.8 mm
Feedback	Multi-turn high-resolution absolute encoder
Encoder type	128 Sin/Cos absolute multi-turn type
Feedback interface	High-resolution absolute feedback
Shaft	Keyed shaft extension
Shaft seal	None
Brake	None
Connector	SpeedTEC DIN
Connector style	Right angle
Connector rotation	180° rotatable
Mounting flange	IEC metric
Mounting holes	Free mounting holes, Type FF
Approx. body diameter	66.5 mm class
Frame dimension	63 mm
Approx. overall length	146.2 mm
Magnetic stack length	50.8 mm
Approx. weight	1.05 kg
Motor construction	Low-inertia rotor
Typical duty	Continuous industrial servo duty
Typical use	Positioning, indexing, feeding and synchronized motion

The 0.27 kW, 0.49 Nm and 7000 rpm characteristics correspond to the B1520U motor size. The exact performance available at the machine shaft depends on the drive, operating conditions, duty cycle, ambient conditions, tuning, and application profile.

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4. Model Number Explanation

The model number MPL-B1520U-VJ72AA can be understood as a configuration code describing the basic motor construction and selected options.

Code	Meaning
MPL	Low-inertia permanent-magnet servo motor family
B	460 V-class motor
15	63 mm frame size
20	50.8 mm magnetic stack
U	7000 rpm speed class
V	Multi-turn high-resolution absolute feedback
J	Keyed shaft extension
7	SpeedTEC DIN connector, right-angle, rotatable configuration
2	No brake
AA	Standard configuration

This model-code structure is useful when comparing different motors within the same series.

For example, a similar motor may have the same basic B1520U motor section but use a different feedback, connector, or brake designation.

The VJ72AA configuration is specifically characterized by multi-turn absolute feedback, keyed shaft, SpeedTEC DIN connector, and no brake.

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5. Product Introduction

The MPL-B1520U-VJ72AA is designed for machines that need accurate and repeatable servo motion without using a large motor frame.

The 63 mm frame gives the motor a relatively compact physical size, while the 50.8 mm magnetic stack provides a useful balance between torque production and motor length.

The 7000 rpm speed rating makes the motor particularly suitable for applications involving rapid indexing, high-speed feeding, rotary positioning, belt-driven mechanisms, and other motion systems where the servo axis must change speed frequently.

The low-inertia rotor is another important characteristic. In a servo application, motor inertia has a direct influence on how quickly the system can accelerate and decelerate.

A lower rotor inertia can make it easier for the servo system to respond to rapid changes in commanded speed and position, particularly when the driven mechanical load is also relatively light.

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6. Multi-Turn Absolute Feedback

The MPL-B1520U-VJ72AA uses a high-resolution multi-turn absolute feedback system.

This is an important feature for precision motion applications because the motor is not simply operated as an open-loop rotating device. The servo control system receives position information from the feedback device and uses that information to regulate the motor.

The multi-turn characteristic is particularly useful where the motor may rotate through many revolutions during normal machine operation.

Typical uses include:

• Rotary indexing
• Servo-driven feeders
• Precision positioning
• Electronic assembly machinery
• Packaging equipment
• Labeling machinery
• Small machine-tool axes
• Inspection equipment
• Automated material handling
• Pick-and-place systems
• High-speed positioning mechanisms

The feedback system also supports closed-loop servo control, allowing the drive system to respond to actual motor movement rather than relying only on the commanded position.

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7. 7000 RPM High-Speed Operation

The motor is rated for approximately 7000 rpm.

This relatively high speed makes the motor suitable for machinery where short cycle times and fast mechanical movement are important.

A high-speed servo motor can also be useful when a transmission mechanism is installed between the motor and the final machine axis.

For example, a pulley, gearbox, belt drive, or other transmission can allow the motor to operate at a high rotational speed while the final machine mechanism moves at a lower controlled speed.

The 7000 rpm capability should always be considered together with the actual load inertia, acceleration profile, duty cycle, drive settings, and mechanical transmission ratio.

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8. Low-Inertia Motor Design

Low rotor inertia is one of the most useful features of the MPL-B1520U-VJ72AA.

When a servo motor accelerates, part of the motor torque is used to accelerate the rotor itself.

A lower-inertia rotor generally requires less torque to change its rotational speed.

This is particularly valuable in applications with:

• Frequent starts and stops
• Rapid acceleration
• Rapid deceleration
• Short positioning movements
• Repeated indexing
• High machine cycle rates
• Lightweight mechanical loads

The result can be a responsive servo axis that can follow changing motion commands quickly.

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9. No-Brake Configuration

The MPL-B1520U-VJ72AA is a no-brake motor.

This is an important point when selecting the motor for a machine.

The motor itself provides servo torque through the electromagnetic motor system, but there is no integrated mechanical holding brake.

For horizontal axes and many rotary applications, this may be perfectly suitable.

For a vertical axis carrying a gravity-loaded mechanism, however, the absence of a brake must be considered carefully.

If the machine requires mechanical holding when power is removed, a separate holding mechanism or an appropriately configured brake-equipped motor may be required.

The no-brake construction also keeps the motor shorter and lighter than an equivalent brake-equipped configuration.

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10. Keyed Shaft Construction

The motor has a keyed shaft extension.

The keyed shaft provides a familiar mechanical interface for connecting the motor to:

• Couplings
• Pulleys
• Gearboxes
• Sprockets
• Rollers
• Belt drives
• Small transmission mechanisms

The shaft key helps transmit torque between the motor shaft and the driven component.

Correct shaft alignment is important because excessive radial or axial loading can negatively affect bearing life and servo performance.

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11. SpeedTEC DIN Connector

The VJ72AA configuration uses a SpeedTEC DIN connector in a right-angle configuration.

The connector can be rotated through approximately 180 degrees.

This provides additional flexibility during machine installation.

In compact equipment, cable routing can become a major mechanical-design issue. A rotatable right-angle connector allows the cable direction to be arranged according to the available machine space.

This can help reduce cable bending and make the motor easier to integrate into tightly packed machine assemblies.

The connector configuration is also an important consideration when replacing an existing motor, because a motor with the same electrical characteristics but a different connector arrangement may not be a direct mechanical replacement.

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12. Approximate Dimensions and Weight

Mechanical Parameter	Approximate Value
Model	MPL-B1520U-VJ72AA
Frame size	63 mm
Approx. body diameter / envelope	66.5 mm
Magnetic stack	50.8 mm
Approx. overall length	146.2 mm
Mounting pilot	Approx. 40 mm class
Shaft type	Keyed
Shaft key	Approx. 3 × 3 × 14 mm
Connector	Right-angle SpeedTEC DIN
Brake	None
Approx. weight	1.05 kg

The dimensions above are useful for preliminary equipment planning. For a close-clearance mechanical installation, the applicable mechanical drawing should be used because connector orientation and specific production revision can affect the installation envelope.

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13. Electrical Characteristics

The B1520U motor belongs to the 460 V-class version of the MPL family.

Its compact motor size is combined with approximately 0.27 kW rated performance and approximately 0.49 Nm continuous stall torque.

Electrical Parameter	Specification
Model	MPL-B1520U-VJ72AA
Voltage class	460 V AC
Rated output	Approx. 0.27 kW
Continuous stall torque	Approx. 0.49 Nm
Peak stall torque	Approx. 1.58 Nm
Rated speed	7000 rpm
Phase	3-phase
Motor type	Permanent-magnet synchronous servo
Feedback	Absolute multi-turn
Brake	None

The motor should be operated with a compatible servo drive and properly configured feedback system. Motor selection should be based on both continuous and peak load requirements rather than motor output alone.

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14. Product Applications

14.1 Packaging Machinery

The motor is well suited to packaging machinery where small mechanisms must move rapidly and accurately.

Typical applications include:

• Film feeding
• Product positioning
• Cutting mechanisms
• Sealing mechanisms
• Label positioning
• Rotary indexing
• Small conveyor synchronization

The high-speed capability can be particularly useful for machines that operate through repeated short cycles.

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14.2 Assembly Machines

Automated assembly equipment often requires several compact servo axes.

The MPL-B1520U-VJ72AA can be used for:

• Component positioning
• Small linear slides
• Rotary indexing
• Tool positioning
• Part feeding
• Component insertion
• Assembly fixture movement

The absolute feedback system provides the servo controller with detailed position information for precise movement.

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14.3 Pick-and-Place Equipment

Pick-and-place machines require rapid acceleration and deceleration.

The low-inertia design can be advantageous in these applications because the motor can respond quickly to changes in commanded motion.

The motor can be used to drive rotary arms, belts, lead screws, or other mechanical transmission systems.

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14.4 Material Handling

The motor can be applied to compact material-handling mechanisms.

Examples include:

• Small conveyors
• Product indexing
• Tray positioning
• Part feeding
• Transfer mechanisms
• Roller positioning
• Automated handling equipment

The no-brake configuration is generally more appropriate for horizontal or mechanically self-supporting axes.

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14.5 Printing and Labeling

Printing and labeling machines require accurate synchronization between different machine sections.

The motor can be used for:

• Feed rollers
• Label positioning
• Small indexing mechanisms
• Cutter positioning
• Registration systems
• Material-feed mechanisms

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14.6 Inspection Equipment

Inspection machines often require accurate positioning of cameras, fixtures, sensors, and components.

The servo motor can provide controlled movement for:

• Inspection stages
• Rotary fixtures
• Camera positioning
• Part positioning
• Measurement mechanisms

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14.7 Electronics Manufacturing

Compact servo motors are frequently useful in electronics manufacturing equipment because the mechanisms are often lightweight but require high positioning accuracy.

Possible applications include:

• Component handling
• Precision indexing
• Feeder mechanisms
• Assembly stages
• Inspection stages
• Small positioning tables

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15. Main Product Advantages

Compact 63 mm Frame

The 63 mm frame provides a relatively small motor envelope while maintaining servo-level positioning capability.

This is useful for compact machine designs where several motors may need to be installed close together.

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High-Speed 7000 RPM Capability

The 7000 rpm rating provides substantial speed capability for high-cycle machinery.

This can help reduce machine cycle time when the mechanical transmission and load are properly matched to the motor.

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Low-Inertia Rotor

The low-inertia design supports fast acceleration and deceleration.

This makes the motor particularly appropriate for repetitive motion profiles.

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Multi-Turn Absolute Feedback

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

This is useful for applications requiring accurate position tracking and repeatable motion.

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Keyed Shaft

The keyed shaft provides a conventional mechanical interface.

This makes it easier to integrate the motor with many standard mechanical transmission components.

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Flexible Connector Orientation

The right-angle SpeedTEC DIN connector can be rotated.

This is particularly useful when the motor is installed in a restricted mechanical space.

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No-Brake Construction

The no-brake configuration keeps the motor relatively compact and lightweight.

It is well suited to applications where a mechanical holding brake is not required.

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Good Torque-to-Size Relationship

The B1520U motor provides approximately 0.49 Nm continuous stall torque from a relatively small 63 mm frame.

This makes it a useful choice for compact precision-motion applications.

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16. Five Related Models from the Same Series

The following models are closely related to the MPL-B1520U-VJ72AA and can be considered when comparing motor size, feedback, brake configuration, or speed characteristics.

Model	Voltage	Frame	Stack	Speed	Continuous Torque	Feedback	Brake	Approx. Dimensions	Approx. Weight
MPL-B1520U-VJ42AA	460 V	63 mm	50.8 mm	7000 rpm	0.49 Nm	Multi-turn absolute	No	Approx. 66.5 × 63 × 146.2 mm	Approx. 1.2 kg
MPL-B1520U-VJ44AA	460 V	63 mm	50.8 mm	7000 rpm	0.49 Nm	Multi-turn absolute	24 VDC	Approx. 66.5 × 63 × 182.3 mm	Approx. 1.4 kg
MPL-B1520U-EJ42AA	460 V	63 mm	50.8 mm	7000 rpm	0.49 Nm	Single-turn absolute	No	Approx. 66.5 × 63 × 146.2 mm	Approx. 1.2 kg
MPL-B1520U-HJ42AA	460 V	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	63 mm	76.2 mm	7000 rpm	0.90 Nm	Multi-turn absolute	No	Approx. 63 mm frame; longer body	Approx. 1.6 kg

The B1520U variants are particularly close to the target model because they share the same basic motor frame, stack length, speed class, and torque class. The main differences are generally associated with feedback, connector, or brake configuration.

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17. MPL-B1520U-VJ72AA vs MPL-B1520U-VJ42AA

These two models are very closely related.

The main difference is the connector configuration represented by the model code.

Parameter	MPL-B1520U-VJ72AA	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	Approx. 0.49 Nm	Approx. 0.49 Nm
Feedback	Multi-turn absolute	Multi-turn absolute
Shaft	Keyed	Keyed
Brake	No brake	No brake
Connector	SpeedTEC DIN, right angle	Standard connector configuration
Approx. dimensions	66.5 × 63 × 146.2 mm	66.5 × 63 × 146.2 mm
Approx. weight	1.05 kg	Approx. 1.2 kg

When replacing one with the other, connector orientation, cable compatibility, and available installation space should be checked rather than assuming that the models are mechanically identical.

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18. MPL-B1520U-VJ72AA vs MPL-B1520U-VJ44AA

The VJ44AA version adds a brake.

Parameter	MPL-B1520U-VJ72AA	MPL-B1520U-VJ44AA
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	Approx. 0.49 Nm	Approx. 0.49 Nm
Feedback	Multi-turn absolute	Multi-turn absolute
Shaft	Keyed	Keyed
Brake	No brake	24 VDC brake
Approx. length	146.2 mm	182.3 mm
Approx. weight	1.05 kg	1.4 kg
Typical use	Horizontal/rotary axes	Applications requiring holding brake

The VJ72AA is therefore the more compact no-brake configuration, while the VJ44AA is the longer brake-equipped configuration.

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19. MPL-B1520U-VJ72AA vs MPL-B1520U-EJ42AA

The main difference between these models is the feedback configuration.

Parameter	MPL-B1520U-VJ72AA	MPL-B1520U-EJ42AA
Frame	63 mm	63 mm
Stack	50.8 mm	50.8 mm
Speed	7000 rpm	7000 rpm
Continuous torque	Approx. 0.49 Nm	Approx. 0.49 Nm
Feedback	Multi-turn absolute	Single-turn absolute
Shaft	Keyed	Keyed
Brake	No	No
Approx. dimensions	66.5 × 63 × 146.2 mm	66.5 × 63 × 146.2 mm
Approx. weight	1.05 kg	Approx. 1.2 kg

The choice between the two depends largely on the feedback requirements of the servo system.

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20. MPL-B1520U-VJ72AA vs MPL-B1530U-VJ42AA

The B1530U uses a longer magnetic stack and produces substantially more torque.

Parameter	MPL-B1520U-VJ72AA	MPL-B1530U-VJ42AA
Frame	63 mm	63 mm
Stack	50.8 mm	76.2 mm
Speed	7000 rpm	7000 rpm
Continuous torque	Approx. 0.49 Nm	Approx. 0.90 Nm
Feedback	Multi-turn absolute	Multi-turn absolute
Brake	No	No
Approx. weight	1.05 kg	Approx. 1.6 kg
Motor size	Compact	Longer/higher-capacity
Typical application	Light-to-medium motion	Higher-torque compact motion

The B1530U is useful when the B1520U’s torque capability is not sufficient but the machine still requires a relatively compact 63 mm frame.

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21. Five Popular Same-Brand Models

The following models are useful for comparison when selecting a motor from the same general product family.

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

These models cover a broader range of motor capacity, from the small B1510V through larger B220T, B320P, and B330P configurations.

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22. MPL-B1510V-VJ42AA

The MPL-B1510V-VJ42AA is a smaller high-speed servo motor.

It uses a 63 mm frame but has a shorter magnetic stack than the B1520U.

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
Peak torque	Approx. 0.77 Nm
Feedback	Multi-turn absolute
Brake	No
Shaft	Keyed
Approx. dimensions	66.5 × 63 × 133.2 mm
Approx. weight	1.0 kg

This model is useful for lightweight, high-speed axes where the B1520U torque level is not necessary.

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23. MPL-B210V-VJ42AA

The MPL-B210V-VJ42AA uses a larger frame and provides approximately 0.55 Nm continuous stall torque.

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	Multi-turn absolute
Brake	No
Shaft	Keyed
Approx. dimensions	Approx. 75 mm frame × 137 mm length
Approx. weight	1.4 kg

It provides slightly more continuous torque than the B1520U while maintaining a high-speed 8000 rpm class.

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24. MPL-B220T-VJ42AA

The MPL-B220T-VJ42AA is a substantially higher-torque motor.

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
Peak torque	Approx. 4.74 Nm
Rated output	Approx. 0.62 kW
Feedback	Multi-turn absolute
Brake	No
Shaft	Keyed
Approx. dimensions	Approx. 75 mm frame × 163 mm length
Approx. weight	2.0 kg

This model is more appropriate when continuous and peak torque requirements are significantly higher than the B1520U can provide.

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25. MPL-B320P-MK22AA

The MPL-B320P-MK22AA moves into a much larger servo-motor size.

Parameter	Specification
Model	MPL-B320P-MK22AA
Voltage	460 V class
Frame	100 mm class
Speed	Approx. 5000 rpm
Rated output	Approx. 1.4 kW
Feedback	Multi-turn absolute
Brake	Configuration dependent
Motor type	Low-inertia permanent-magnet servo
Approx. dimensions	Approx. 100 mm frame; larger overall envelope
Approx. weight	3.7 kg
Typical use	Medium-load precision motion

This motor is physically and electrically larger than the B1520U and should be considered when machine load requirements move beyond the small-frame motor range.

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26. MPL-B330P-MK22AA

The MPL-B330P-MK22AA is another higher-capacity model in the same broad servo family.

Parameter	Specification
Model	MPL-B330P-MK22AA
Voltage	460 V class
Frame	100 mm class
Speed	Approx. 5000 rpm
Rated output	Approx. 1.8 kW
Feedback	Multi-turn absolute
Brake	Configuration dependent
Motor type	Low-inertia permanent-magnet servo
Approx. dimensions	Approx. 100 mm frame; larger overall envelope
Approx. weight	4.6 kg
Typical use	Higher-load precision motion

Compared with the B1520U, the B330P is intended for considerably larger loads and higher output requirements.

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27. Application Selection Guide

Application	Suitability of MPL-B1520U-VJ72AA	Main Reason
Packaging	Very suitable	High speed and accurate positioning
Labeling	Very suitable	Rapid indexing and feedback
Assembly	Very suitable	Compact size and precise motion
Pick-and-place	Suitable	Low inertia and fast response
Small conveyor	Suitable	Speed and servo synchronization
Inspection stage	Very suitable	High-resolution position control
Rotary indexing	Very suitable	7000 rpm and absolute feedback
Electronics machinery	Very suitable	Compact precision motion
Horizontal positioning	Very suitable	No brake required
Vertical lifting	Requires additional consideration	No integrated holding brake
Heavy load axis	Depends on load	Torque must be calculated
High-inertia load	Application dependent	Servo inertia ratio must be checked

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28. Advantages for Machine Builders

The MPL-B1520U-VJ72AA offers several characteristics that are useful during machine development.

Small Mechanical Footprint

The 63 mm frame allows designers to create compact motion assemblies.

High-Speed Operation

The 7000 rpm rating allows fast motor-side movement.

Absolute Position Feedback

The multi-turn encoder provides detailed position information for closed-loop control.

Low Rotor Inertia

The low-inertia construction supports rapid dynamic response.

Flexible Cable Direction

The rotatable right-angle connector can make cable routing easier.

Conventional Mechanical Interface

The keyed shaft is compatible with many conventional transmission arrangements.

Lightweight Construction

The approximate 1.05 kg motor weight can help reduce the moving mass of compact mechanisms.

No Brake

For applications that do not need a mechanical holding brake, the no-brake configuration provides a simpler and shorter motor arrangement.

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29. Maintenance Recommendations

Although servo motors are designed for industrial service, regular inspection remains important.

The motor mounting should be checked periodically to make sure mounting hardware remains secure.

The coupling should be inspected for alignment and mechanical wear.

The shaft should be checked for abnormal vibration or unusual mechanical noise.

The feedback cable and connector should be inspected for damage, looseness, or excessive mechanical stress.

The connector should not be subjected to excessive bending forces.

Motor temperature should also be monitored when the machine operates at high speed or under high continuous load.

If the motor is installed in a dusty, wet, or chemically aggressive environment, the actual environmental conditions should be compared with the motor’s specified enclosure and operating limits.

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30. Installation Considerations

Correct installation is important for achieving the expected servo performance.

The motor should be installed on a rigid mounting surface.

The driven shaft should be correctly aligned with the motor shaft.

The mechanical coupling should be selected according to the required torque, speed, shaft dimensions, and allowable misalignment.

The feedback cable should be routed carefully to minimize electrical interference.

Power and feedback wiring should be installed according to the applicable machine wiring requirements.

Because this particular model does not contain an integrated holding brake, vertical-axis applications require additional attention.

If a vertical load can move downward when motor power is removed, the machine should have an appropriate mechanical holding method or use a suitable brake-equipped motor configuration.

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31. Replacement Considerations

When replacing an MPL-B1520U-VJ72AA, checking the part number alone is not enough.

The following parameters should be compared:

Replacement Parameter	What Should Be Checked
Model	MPL-B1520U-VJ72AA or approved equivalent
Voltage	460 V-class compatibility
Frame	63 mm
Stack	50.8 mm
Speed	7000 rpm
Continuous torque	Approx. 0.49 Nm
Peak torque	Approx. 1.58 Nm
Feedback	Multi-turn absolute
Shaft	Keyed
Brake	No brake
Connector	SpeedTEC DIN configuration
Connector orientation	Right-angle / rotatable
Mounting	IEC metric
Dimensions	Verify complete mechanical envelope
Weight	Approx. 1.05 kg
Drive compatibility	Must be verified
Cable compatibility	Must be verified
Feedback compatibility	Must be verified

The connector and feedback configuration are particularly important. Two motors may have similar torque and speed ratings but still not be direct electrical replacements if the feedback system or connector arrangement is different.

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32. Important Difference Between VJ72AA and Brake Models

The VJ72AA designation represents a no-brake configuration.

A brake-equipped motor from the same general motor family will normally have a different configuration code.

This difference is important because adding a brake changes the motor’s overall length, weight, electrical connections, and machine-control requirements.

Feature	MPL-B1520U-VJ72AA	Brake-Equipped Version
Frame	63 mm	63 mm
Stack	50.8 mm	50.8 mm
Speed	7000 rpm	7000 rpm
Feedback	Multi-turn absolute	Multi-turn absolute
Shaft	Keyed	Keyed
Brake	No	24 VDC
Approx. length	146.2 mm	Approx. 182.3 mm
Approx. weight	1.05 kg	Approx. 1.4 kg
Vertical holding	External solution required	Integrated holding brake

This distinction should be considered carefully when selecting a replacement motor.

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33. Overall Technical Summary

Parameter	Specification
Model	MPL-B1520U-VJ72AA
Brand	Allen-Bradley
Product family	MP-Series
Product series	MPL Low-Inertia Servo Motors
Motor technology	Permanent-magnet brushless AC servo
Voltage	460 V AC class
Frame size	63 mm
Stack length	50.8 mm
Rated speed	7000 rpm
Rated output	Approx. 0.27 kW
Continuous stall torque	Approx. 0.49 Nm
Peak stall torque	Approx. 1.58 Nm
Feedback	Multi-turn high-resolution absolute encoder
Encoder	128 Sin/Cos absolute multi-turn type
Shaft	Keyed
Shaft seal	None
Brake	None
Connector	SpeedTEC DIN
Connector position	Right angle
Connector rotation	180°
Mounting	IEC metric
Mounting-hole style	Free mounting holes, Type FF
Approx. dimensions	66.5 × 63 × 146.2 mm
Approx. weight	1.05 kg
Motor design	Low inertia
Primary use	Precision motion control
Typical applications	Packaging, assembly, indexing, inspection, feeding, handling and positioning

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34. Final Product Description

The Allen-Bradley MPL-B1520U-VJ72AA is a compact 63 mm-frame low-inertia servo motor designed for high-speed and precision motion-control applications.

Its combination of approximately 0.27 kW output, 0.49 Nm continuous stall torque, 7000 rpm speed, 50.8 mm magnetic stack, and multi-turn absolute feedback makes it well suited to compact automated machinery.

The motor’s multi-turn high-resolution encoder is one of its most important features. It provides detailed position feedback to the servo control system and is useful for applications involving repeated positioning and multiple motor revolutions.

The keyed shaft provides a conventional mechanical connection for couplings, pulleys, gearboxes, rollers, and other mechanical transmission components.

The SpeedTEC DIN right-angle connector provides additional flexibility during installation because the connector orientation can be adjusted. This can be particularly useful in compact machine structures where cable space is limited.

Unlike the brake-equipped versions of similar motors, the MPL-B1520U-VJ72AA has no integrated holding brake. This makes it particularly suitable for horizontal positioning axes, rotary axes, feeders, indexing systems, and other applications where a mechanical holding brake is not required.

Its relatively low weight of approximately 1.05 kg and compact mechanical envelope make it practical for machines where motor size and moving mass need to be controlled.

In practical machine design, the most important characteristics of this model are therefore its 63 mm frame, 50.8 mm stack, 7000 rpm speed, approximately 0.49 Nm continuous stall torque, multi-turn absolute feedback, keyed shaft, SpeedTEC DIN connector, no-brake configuration, approximately 146.2 mm overall motor length, and approximately 1.05 kg weight.

For replacement work, the feedback type, connector arrangement, shaft configuration, voltage class, dimensions, and drive compatibility should all be confirmed before installation. The motor’s mechanical envelope should also be checked carefully when replacing another configuration, particularly when the existing motor uses a brake or a different connector arrangement.

Overall, the MPL-B1520U-VJ72AA is a compact high-speed servo motor intended for precision industrial automation where fast response, repeatable positioning, absolute multi-turn feedback, and a small mechanical footprint are important.