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Allen-Bradley MPL-B1520U-VJ74AA Servo Motor

1. Product Overview

The Allen-Bradley MPL-B1520U-VJ74AA 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 is built around a 63 mm frame with a 50.8 mm magnetic stack. The motor is designed for the 460 V-class supply range and provides a rated speed of approximately 7000 rpm.

The motor combines a relatively small mechanical envelope with high-speed operation, absolute multi-turn feedback, a keyed shaft, and an integrated 24 VDC holding brake. This combination makes it suitable for automated machinery where accurate positioning, repeatable movement, rapid acceleration, and mechanical holding are important.

The VJ74AA configuration is particularly notable because it combines the multi-turn absolute encoder with a right-angle SpeedTEC DIN connector and a 24 VDC brake. The connector can be rotated through approximately 180 degrees, which can be useful when cable routing space is limited.

The motor is generally used as part of a closed-loop servo system rather than as a stand-alone motor. The servo drive receives position feedback from the encoder and regulates torque, speed, and position according to the machine motion profile.

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2. Brand and Product Series

Parameter	Specification
Model	MPL-B1520U-VJ74AA
Brand	Allen-Bradley
Product family	MP-Series
Product series	MPL Low-Inertia Servo Motors
Motor category	Rotary servo motor
Motor technology	Permanent-magnet brushless AC servo
Motor construction	Low-inertia
Voltage class	460 V AC
Frame size	63 mm
Magnetic stack	50.8 mm / 2.0 in
Rated speed	7000 rpm
Feedback	Multi-turn high-resolution absolute encoder
Shaft	Keyed shaft extension
Brake	24 VDC holding brake
Connector	SpeedTEC DIN, right-angle
Connector rotation	180° rotatable
Mounting	IEC metric
Mounting-hole style	Free mounting holes, Type FF
Shaft seal	No shaft seal
Approx. dimensions	66.5 × 63 × 182.3 mm
Approx. weight	1.4 kg
Typical application	Precision industrial motion control

The model configuration is identified as a 460 V, 63 mm frame, 50.8 mm stack, 7000 rpm, multi-turn absolute-feedback servo motor with a keyed shaft, SpeedTEC DIN connector, and 24 VDC brake.

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3. Detailed Technical Parameters

Parameter	Specification
Model	MPL-B1520U-VJ74AA
Brand	Allen-Bradley
Series	MPL Low-Inertia Servo Motors
Motor type	Brushless permanent-magnet AC servo motor
Voltage	460 V AC class
Voltage classification	400/460 V class
Phase	Three-phase
Rated output	Approximately 0.27 kW
Rated speed	7000 rpm
Continuous stall torque	Approximately 0.49 Nm
Peak stall torque	Approximately 1.58 Nm
Frame size	63 mm
Magnetic stack length	50.8 mm
Feedback	Absolute multi-turn
Encoder	High-resolution absolute multi-turn encoder
Feedback resolution	128 Sin/Cos type
Shaft	Keyed shaft extension
Shaft seal	None as standard
Brake	24 VDC holding brake
Brake holding torque	Approximately 0.9 Nm
Connector	SpeedTEC DIN
Connector type	Right-angle
Connector adjustment	Approximately 180° rotatable
Mounting flange	IEC metric
Mounting holes	Free mounting holes, Type FF
Approx. body envelope	66.5 mm class
Frame dimension	63 mm
Approx. motor length	182.3 mm
Approx. weight	1.4 kg
Motor design	Low inertia
Typical duty	Servo-controlled industrial motion
Primary function	High-speed precision positioning

The published technical information identifies the motor as a 7000 rpm, 0.49 Nm-class B1520U servo motor with multi-turn absolute feedback and a 24 VDC holding brake.

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4. Model Number Explanation

The complete model number is:

MPL-B1520U-VJ74AA

The individual sections provide useful information about the motor’s construction and options.

Model Code	Meaning
MPL	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 right-angle connector, rotatable
4	24 VDC holding brake
AA	Standard factory configuration

This coding structure is useful when comparing closely related models.

For example, the VJ72AA configuration is closely related to the VJ74AA but does not have the integrated brake. The change from the “2” brake designation to the “4” configuration therefore has a direct effect on motor length, weight, and machine application.

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5. Product Introduction

The MPL-B1520U-VJ74AA is intended for machinery where a conventional induction motor is not sufficient because the application requires controlled positioning, speed regulation, acceleration, deceleration, and repeatability.

The motor is designed around a low-inertia rotor.

This is important in servo applications because the motor frequently needs to change speed rather than simply run continuously at a fixed speed.

A low-inertia motor can respond quickly to changes in the commanded motion profile. This makes the motor particularly useful for machines that repeatedly accelerate, decelerate, stop, reverse, and reposition.

The 7000 rpm speed capability provides considerable speed capacity for compact machinery.

The motor can also be combined with mechanical transmissions such as belt drives, pulleys, couplings, gearboxes, lead screws, or other mechanisms to convert high motor speed into the required machine-axis movement.

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6. Multi-Turn Absolute Encoder

The feedback system is one of the major characteristics of the MPL-B1520U-VJ74AA.

The motor uses a high-resolution absolute multi-turn encoder.

The encoder allows the servo control system to monitor the actual motor position and movement.

The multi-turn characteristic is useful when the motor rotates through multiple revolutions during normal operation.

This makes the motor suitable for applications where the machine needs accurate position information throughout a relatively large range of motor movement.

Typical uses include:

• Precision indexing
• Servo-driven feeding
• Rotary positioning
• Packaging equipment
• Assembly machinery
• Inspection systems
• Material-handling mechanisms
• Electronic manufacturing equipment
• Pick-and-place mechanisms
• Automated positioning stages

The feedback system is especially useful when accurate position tracking is required rather than simple speed control.

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7. 24 VDC Holding Brake

The MPL-B1520U-VJ74AA includes a 24 VDC holding brake.

This is one of the main differences between this model and the corresponding no-brake configurations.

The brake is intended primarily for holding the motor shaft in position when the motor is not actively producing servo torque.

This can be particularly useful for vertical or gravity-loaded axes.

Examples include:

• Vertical slides
• Z-axis mechanisms
• Lifting mechanisms
• Height-adjustment systems
• Vertical positioning tables
• Small elevators
• Gravity-loaded tooling
• Vertical material-handling equipment

The brake should be considered a holding device rather than automatically treated as the normal dynamic stopping method for a moving load.

The servo drive and motor should normally perform controlled deceleration, while the brake provides mechanical holding when required.

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8. High-Speed 7000 RPM Operation

The motor has a rated speed of approximately 7000 rpm.

This high-speed characteristic makes the motor appropriate for applications where machine cycle time is important.

A high-speed servo motor can also provide flexibility when the motor is connected to a transmission.

For example, a belt or gearbox can reduce the final output speed while allowing the motor to operate within its efficient servo speed range.

The 7000 rpm rating is particularly useful for:

• High-speed indexing
• Feeding mechanisms
• Packaging equipment
• Printing mechanisms
• Labeling machines
• Small rotary tables
• High-speed positioning
• Lightweight linear axes

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9. Low-Inertia Design

The low-inertia construction is a major advantage of the MPL series.

A servo motor must repeatedly overcome its own rotor inertia as well as the inertia of the connected mechanical load.

When rotor inertia is relatively low, the motor can change speed rapidly.

This can improve the response of applications involving:

• Short positioning movements
• Repeated indexing
• Rapid acceleration
• Rapid deceleration
• Frequent direction changes
• High machine cycle rates
• Lightweight mechanical loads

The actual dynamic performance will still depend on the complete system, including load inertia, transmission ratio, servo tuning, acceleration requirements, and drive configuration.

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10. Keyed Shaft

The MPL-B1520U-VJ74AA uses a keyed shaft extension.

A keyed shaft is a conventional and practical mechanical interface.

It can be used with a variety of mechanical components, including:

• Flexible couplings
• Pulleys
• Gearboxes
• Timing-belt systems
• Rollers
• Sprockets
• Mechanical indexing systems

The shaft key helps provide positive torque transmission between the motor and driven component.

Proper shaft alignment remains important. Excessive radial or axial load should be avoided because it can affect bearing life and mechanical reliability.

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11. SpeedTEC DIN Connector

The VJ74AA configuration uses a SpeedTEC DIN right-angle connector.

The connector is designed to be rotated through approximately 180 degrees.

This is useful in compact machinery where the motor may be installed close to machine frames, covers, cable trays, or other components.

The ability to change connector orientation can make the motor easier to integrate into a machine without placing excessive bending stress on the cable.

When replacing an existing servo motor, connector type and orientation should therefore be checked in addition to electrical and mechanical specifications.

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12. Dimensions and Weight

The brake-equipped configuration is longer and heavier than the corresponding no-brake motor.

Mechanical Parameter	Approximate Specification
Model	MPL-B1520U-VJ74AA
Frame size	63 mm
Approx. body/envelope diameter	66.5 mm
Magnetic stack	50.8 mm
Approx. overall length	182.3 mm
Mounting pilot	Approx. 40 mm class
Shaft	Keyed
Shaft key	Approx. 3 × 3 × 14 mm
Connector	Right-angle SpeedTEC DIN
Connector rotation	180°
Brake	24 VDC
Approx. weight	1.4 kg

The weight is approximately 1.4 kg for the brake-equipped configuration. Published specifications can differ slightly in how motor weight and shipping weight are reported, so the engineering motor weight should be distinguished from packaged shipping weight.

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13. Electrical Performance

Electrical Parameter	Specification
Model	MPL-B1520U-VJ74AA
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
Motor type	Permanent-magnet AC servo
Feedback	Absolute multi-turn
Brake voltage	24 VDC
Brake	Holding brake
Phase	Three-phase

The motor is intended to operate as part of a properly matched servo system. Motor selection should consider continuous torque, peak torque, load inertia, acceleration, deceleration, duty cycle, and operating speed rather than relying only on the rated output value.

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14. Typical Product Applications

Packaging Machinery

Packaging machinery frequently requires rapid and repeatable movement.

The MPL-B1520U-VJ74AA can be used for:

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

The combination of high speed and absolute feedback is useful for repeated positioning cycles.

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Assembly Machinery

Automated assembly equipment can require several servo axes operating together.

The motor can be used for:

• Component positioning
• Rotary indexing
• Fixture movement
• Tool positioning
• Part feeding
• Small linear axes
• Component insertion

The compact frame can be helpful where several servo motors must fit into a relatively small machine structure.

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Vertical Positioning

The integrated 24 VDC brake makes this motor particularly useful for applications in which a load must remain stationary after the servo axis has stopped.

Examples include:

• Z-axis slides
• Vertical positioning stages
• Small lifting systems
• Height-adjustment mechanisms
• Vertical tooling
• Gravity-loaded machine mechanisms

The brake’s holding capability should be matched to the actual static load and safety requirements of the machine.

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Pick-and-Place Systems

Pick-and-place mechanisms typically require rapid acceleration and deceleration.

The low-inertia motor design is suitable for repeated short movements.

It can be used to drive:

• Rotary arms
• Belt axes
• Lead-screw axes
• Small positioning stages
• Transfer mechanisms

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Material Handling

The motor can be used in compact material-handling equipment.

Typical applications include:

• Product positioning
• Tray movement
• Small conveyor axes
• Transfer mechanisms
• Roller drives
• Indexing mechanisms

The integrated brake provides additional flexibility for applications involving vertical or gravity-loaded movement.

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Printing and Labeling

Printing and labeling machinery often requires accurate synchronization.

The motor can be used for:

• Feed rollers
• Registration systems
• Label positioning
• Cutter mechanisms
• Material feeding
• Rotary positioning

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Inspection Equipment

Automated inspection systems often use servo motors to position products, fixtures, cameras, and inspection heads.

The MPL-B1520U-VJ74AA can be applied to:

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

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15. Main Advantages

15.1 Compact 63 mm Frame

The 63 mm frame provides a relatively compact installation footprint.

This is particularly useful in multi-axis machinery where several motors must be mounted close together.

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15.2 High-Speed Operation

The 7000 rpm speed capability provides substantial speed capacity for compact automation systems.

This is useful for short-cycle machines and mechanisms requiring rapid movement.

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15.3 Low-Inertia Rotor

The low-inertia construction supports rapid acceleration and deceleration.

This can be particularly beneficial in indexing and positioning applications.

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15.4 Multi-Turn Absolute Feedback

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

This is useful for precision motion and repeatable positioning.

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15.5 Integrated 24 VDC Brake

The holding brake adds mechanical holding capability.

This is particularly valuable for vertical axes and other gravity-loaded mechanisms.

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15.6 Keyed Shaft

The keyed shaft provides a conventional and practical mechanical connection.

It can be used with many standard mechanical transmission components.

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15.7 Flexible Connector Orientation

The right-angle connector can be rotated, providing additional flexibility for cable routing.

This can simplify mechanical integration in compact equipment.

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15.8 Relatively Low Motor Weight

At approximately 1.4 kg, the motor remains relatively light for its servo performance class.

This can be useful for moving mechanisms where motor mass contributes to total system inertia.

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16. Five Related Models from the Same Series

The following models are closely related to the MPL-B1520U-VJ74AA and are useful for comparing feedback, brake, connector, frame, and torque characteristics.

Model	Voltage	Frame	Stack	Speed	Continuous Torque	Feedback	Brake	Approx. Dimensions	Approx. Weight
MPL-B1520U-VJ72AA	460 V	63 mm	50.8 mm	7000 rpm	0.49 Nm	Multi-turn absolute	No	Approx. 66.5 × 63 × 146.2 mm	Approx. 1.05 kg
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-EJ44AA	460 V	63 mm	50.8 mm	7000 rpm	0.49 Nm	Single-turn absolute	24 VDC	Approx. 66.5 × 63 × 182.3 mm	Approx. 1.4 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 closest alternatives are the other B1520U configurations because they share the same basic 63 mm frame, 50.8 mm stack, and 7000 rpm motor class. The main differences are feedback, connector, and brake configuration.

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17. MPL-B1520U-VJ74AA vs MPL-B1520U-VJ72AA

These two configurations are particularly close.

The main difference is the brake.

Parameter	MPL-B1520U-VJ74AA	MPL-B1520U-VJ72AA
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
Connector	SpeedTEC DIN	SpeedTEC DIN
Brake	24 VDC	None
Approx. length	182.3 mm	146.2 mm
Approx. weight	1.4 kg	Approx. 1.05 kg

The VJ74AA is therefore the brake-equipped version, while the VJ72AA provides the shorter no-brake configuration.

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18. MPL-B1520U-VJ74AA vs MPL-B1520U-VJ42AA

Parameter	MPL-B1520U-VJ74AA	MPL-B1520U-VJ42AA
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	None
Approx. length	182.3 mm	146.2 mm
Approx. weight	1.4 kg	Approx. 1.2 kg
Typical application	Holding/vertical axes	Horizontal or rotary axes

The principal selection issue is whether the machine requires an integrated holding brake.

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19. MPL-B1520U-VJ74AA vs MPL-B1520U-EJ44AA

Both configurations include a brake, but the feedback configuration differs.

Parameter	MPL-B1520U-VJ74AA	MPL-B1520U-EJ44AA
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	Single-turn absolute
Shaft	Keyed	Keyed
Brake	24 VDC	24 VDC
Approx. length	182.3 mm	Approx. 182.3 mm
Approx. weight	1.4 kg	Approx. 1.4 kg

The VJ74AA should therefore be considered when multi-turn absolute position information is required.

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20. MPL-B1520U-VJ74AA vs MPL-B1530U-VJ42AA

The B1530U uses a longer magnetic stack and provides more continuous torque.

Parameter	MPL-B1520U-VJ74AA	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	Multi-turn absolute	Multi-turn absolute
Brake	24 VDC	None
Approx. weight	1.4 kg	1.6 kg
Motor length	Approx. 182.3 mm	Longer motor configuration
Typical role	Compact servo with brake	Higher-torque compact servo

The B1530U is useful when more continuous torque is required while remaining within the same general small-frame MPL motor family.

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21. Five Same-Brand Models for Comparison

The following models provide a broader comparison across the same general servo-motor product family.

Model	Voltage	Frame	Speed	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 represent different motor capacities rather than identical substitutes. The smaller B1510V is aimed at lighter high-speed motion, while the B220T, B320P, and B330P move into higher torque or higher output ranges.

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22. MPL-B1510V-VJ42AA

The MPL-B1510V-VJ42AA is a smaller 63 mm-frame servo motor.

Its magnetic stack is shorter than the B1520U, and its maximum speed is approximately 8000 rpm.

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
Output	Approx. 0.16 kW
Feedback	Multi-turn absolute
Brake	No
Shaft	Keyed
Approx. dimensions	66.5 × 63 × 133.2 mm
Approx. weight	1.0 kg

This model is appropriate for lighter loads where very high speed is more important than the additional torque available from the B1520U.

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23. MPL-B210V-VJ42AA

The MPL-B210V-VJ42AA uses a larger 75 mm-class frame and offers 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

This motor offers a useful step upward in continuous torque while retaining a high-speed servo design.

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24. MPL-B220T-VJ42AA

The MPL-B220T-VJ42AA provides a substantially higher torque level 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
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

It is useful for applications where the 0.49 Nm continuous torque level of the B1520U is insufficient.

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25. MPL-B320P-MK22AA

The MPL-B320P-MK22AA is substantially larger than the B1520U.

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 application	Medium-load precision motion

This model is intended for a considerably higher mechanical load range than the compact B1520U.

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26. MPL-B330P-MK22AA

The MPL-B330P-MK22AA is another larger-capacity motor 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 application	Higher-load precision motion

The B330P is physically larger and provides much greater output than the B1520U.

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27. Application Selection Table

Application	Suitability	Main Reason
Packaging	High	High speed and precise indexing
Assembly	High	Compact size and feedback control
Pick-and-place	High	Low inertia and fast response
Rotary indexing	High	7000 rpm and absolute feedback
Labeling	High	Precise feeding and positioning
Inspection	High	Accurate servo positioning
Electronics machinery	High	Compact precision motion
Material handling	High	Servo-controlled movement
Horizontal axis	High	Brake is not necessarily required
Vertical axis	High with proper design	Integrated holding brake
High-inertia load	Application dependent	Load inertia must be calculated
Heavy-duty axis	Application dependent	Higher-capacity motor may be needed
High-cycle machinery	High	Low-inertia and high-speed design

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28. Practical Advantages in Machine Design

The MPL-B1520U-VJ74AA can provide several practical benefits when incorporated into a properly designed servo system.

Compact Installation

The 63 mm frame helps reduce the physical footprint of the servo axis.

High Rotational Speed

The 7000 rpm speed class provides substantial speed capability for high-cycle mechanisms.

Fast Dynamic Response

The low-inertia rotor is useful for applications with repeated acceleration and deceleration.

Absolute Multi-Turn Feedback

The encoder provides detailed position information across multiple revolutions.

Mechanical Holding

The integrated 24 VDC brake provides a useful holding function for suitable applications.

Flexible Connector Orientation

The rotatable right-angle connector helps with cable routing in compact equipment.

Conventional Shaft Connection

The keyed shaft makes integration with many mechanical transmission components straightforward.

Broad Application Range

The motor can be used in packaging, assembly, inspection, handling, positioning, indexing, and other automation applications.

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29. Maintenance Considerations

Routine inspection is important for maintaining reliable servo performance.

The motor mounting should be checked periodically for looseness.

The mechanical coupling should be inspected for alignment and wear.

Abnormal vibration, unusual mechanical noise, or unexpected temperature rise should be investigated.

The encoder connector and motor connector should be kept mechanically secure.

Cable routing should prevent excessive bending or pulling forces.

The brake should also be periodically checked if the motor is used on a vertical or gravity-loaded axis.

Brake performance should be verified according to the machine’s maintenance requirements rather than assuming that the brake will remain at its original holding capability indefinitely.

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30. Installation Considerations

The motor should be mounted to a rigid machine surface.

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

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

The motor cable and feedback cable should be routed carefully.

The right-angle connector can be rotated to improve cable routing, but the cable should not be forced into a sharp bend.

The brake wiring should be correctly integrated into the machine-control system.

For vertical applications, the brake should be considered as part of the overall load-holding strategy rather than the only safety measure unless the complete machine design specifically permits that arrangement.

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31. Replacement Selection Checklist

When replacing an existing MPL-B1520U-VJ74AA, the following parameters should be checked.

Selection Item	Required Check
Model	MPL-B1520U-VJ74AA
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	Absolute multi-turn
Shaft	Keyed
Connector	SpeedTEC DIN
Connector orientation	Right angle / rotatable
Brake	24 VDC
Brake holding capability	Approx. 0.9 Nm class
Mounting	IEC metric
Approx. length	182.3 mm
Approx. weight	1.4 kg
Shaft seal	None as standard
Drive compatibility	Must be confirmed
Feedback compatibility	Must be confirmed
Cable compatibility	Must be confirmed
Mechanical clearance	Must be confirmed

A motor should not be selected as a direct replacement based only on output power or frame size. Feedback, connector, brake, shaft, mounting, and drive compatibility all need to match the machine requirements.

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32. VJ74AA Compared with the No-Brake Configuration

The brake is the most obvious difference between the VJ74AA and related no-brake versions.

Feature	MPL-B1520U-VJ74AA	MPL-B1520U-VJ72AA
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
Connector	SpeedTEC DIN	SpeedTEC DIN
Brake	24 VDC	None
Approx. length	182.3 mm	146.2 mm
Approx. weight	1.4 kg	Approx. 1.05 kg
Vertical holding	Integrated brake	External solution normally required
Installation space	Longer	More compact

The VJ74AA is therefore particularly useful when the machine requires integrated mechanical holding.

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33. Overall Technical Summary

Parameter	MPL-B1520U-VJ74AA
Model	MPL-B1520U-VJ74AA
Brand	Allen-Bradley
Product family	MP-Series
Series	MPL Low-Inertia Servo Motors
Motor technology	Permanent-magnet brushless AC servo
Voltage class	460 V AC
Frame size	63 mm
Magnetic stack	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
Feedback type	128 Sin/Cos absolute multi-turn
Shaft	Keyed shaft extension
Shaft seal	No shaft seal
Connector	SpeedTEC DIN
Connector style	Right angle
Connector rotation	180° rotatable
Brake	24 VDC holding brake
Brake torque	Approx. 0.9 Nm
Mounting	IEC metric
Mounting holes	Free mounting holes, Type FF
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, inspection, handling, feeding and positioning

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34. Final Product Description

The Allen-Bradley MPL-B1520U-VJ74AA is a compact, high-speed, low-inertia servo motor designed for precision industrial automation.

Its 63 mm frame, 50.8 mm magnetic stack, approximately 0.27 kW output, approximately 0.49 Nm continuous stall torque, and 7000 rpm speed capability make it well suited to compact servo axes that require fast and repeatable motion.

The multi-turn absolute feedback system provides detailed motor-position information for closed-loop servo control.

The keyed shaft provides a conventional mechanical interface for connecting the motor to couplings, pulleys, gearboxes, rollers, belts, and other transmission components.

The 24 VDC holding brake is an important feature of the VJ74AA configuration. It allows the motor to provide mechanical holding capability when the servo axis needs to remain stationary, making the motor particularly useful for suitable vertical and gravity-loaded applications.

The SpeedTEC DIN right-angle connector adds installation flexibility. Its approximately 180-degree rotational capability can help with cable routing and machine integration, especially when the motor is installed in a compact enclosure or multi-axis mechanism.

The low-inertia design is another major advantage. The motor is intended for applications in which the axis repeatedly accelerates, decelerates, stops, reverses, or changes position. This makes it particularly suitable for packaging, assembly, indexing, feeding, inspection, material handling, labeling, and other automated equipment.

From a mechanical perspective, the approximate 66.5 × 63 × 182.3 mm envelope and 1.4 kg motor weight provide a useful balance between compact construction and servo performance. The brake-equipped configuration is longer and heavier than the corresponding no-brake B1520U versions.

For replacement and machine-design work, the most important characteristics to verify are the 460 V-class electrical system, 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, 24 VDC brake, approximately 182.3 mm overall length, and approximately 1.4 kg weight.

The exact mechanical drawing, connector clearance, feedback compatibility, brake wiring, and servo-drive compatibility should be checked before installation, particularly when replacing another motor configuration.

Overall, the MPL-B1520U-VJ74AA is a compact servo solution for precision machinery that needs high-speed operation, low-inertia dynamic response, absolute multi-turn feedback, conventional keyed-shaft mounting, and integrated mechanical holding capability.