1. Product Overview

Product Model: MPL-B1520U-EJ72AA

Brand: Allen-Bradley

Product Series: MP-Series MPL Low-Inertia Brushless Servo Motors

Product Type: AC Rotary Servo Motor

Voltage Class: 460 V AC

Rated Speed: 7000 RPM

Feedback: Single-turn High-resolution Encoder

Brake: No Brake

The MPL-B1520U-EJ72AA is a compact low-inertia brushless AC servo motor designed for industrial motion-control applications that require rapid acceleration, accurate positioning, high rotational speed, and dependable closed-loop operation.

This model is part of the MP-Series MPL low-inertia servo motor family. It uses a 63 mm frame with a 50.8 mm magnet stack and is designed for a rated speed of 7000 RPM. The motor incorporates a keyed shaft extension and a right-angle SpeedTEC DIN connector that can be rotated through 180 degrees for installation flexibility.

The MPL-B1520U-EJ72AA uses a single-turn high-resolution encoder for position feedback. The encoder allows the motion controller to continuously monitor motor position and make corrections during operation, which is particularly useful for indexing, positioning, synchronization, and other repetitive machine movements.

This particular version does not include an integrated holding brake. As a result, it is well suited to applications where a mechanical holding brake is not required, where the axis operates horizontally, or where the machine uses an external mechanical holding arrangement.

The 50.8 mm magnet stack gives this model a higher torque capability than the shorter 1510-size motor configuration while maintaining the compact 63 mm frame. This makes the MPL-B1520U-EJ72AA useful when a machine needs more motor capability without moving to a substantially larger frame size.

2. Brand and Product Series

3. Model Number Explanation

The model number provides useful information about the motor configuration.

The model code therefore identifies a 63 mm frame, 50.8 mm stack, 7000 RPM, single-turn encoder, keyed-shaft, no-brake servo motor.

4. Detailed Technical Parameters

*The 63 mm frame dimension and 50.8 mm magnet-stack dimension are fixed catalog characteristics. The approximate overall envelope shown above is intended for general product description; the exact installation envelope should be taken from the mechanical drawing for engineering clearance and mounting work.

5. Electrical and Motion Characteristics

The MPL-B1520U-EJ72AA is designed around a high-speed servo architecture rather than a conventional fixed-speed induction motor.

The motor is intended to operate together with a compatible servo drive and motion controller. The drive regulates current, torque, speed, and position according to commands from the control system.

The 7000 RPM speed rating makes the motor suitable for machinery where rapid rotary movement and short cycle times are important.

The approximately 0.49 Nm continuous stall torque places this model above the shorter low-inertia motor configurations within the same frame family. The longer 50.8 mm magnet stack provides additional electromagnetic capability while retaining the 63 mm frame diameter.

The motor’s low rotor inertia is particularly useful when the driven load also has relatively low or moderate inertia. In such situations, the motor can change speed quickly without requiring excessive acceleration time.

6. Feedback System

The MPL-B1520U-EJ72AA uses a single-turn high-resolution encoder.

The encoder is an important part of the servo system because the motor does not simply rotate at a commanded speed. Instead, the servo drive continuously receives feedback and compares actual motor behavior with the commanded motion.

This closed-loop arrangement provides several practical benefits:

• Accurate position monitoring.
• Improved repeatability.
• Fast correction of motion errors.
• Better synchronization between motor and machine mechanism.
• Stable speed regulation.
• Precise indexing.

The single-turn configuration is suitable for many rotary positioning applications where the machine controller manages the overall axis position and reference strategy.

For applications requiring position information over multiple mechanical revolutions without relying on a separate external reference arrangement, a multi-turn encoder configuration may be more appropriate.

7. Mechanical Design

The motor uses a 63 mm frame size with a 50.8 mm magnet stack.

This combination provides a useful balance between physical size and torque capability.

The keyed shaft extension is designed for use with mechanical couplings, pulleys, gearboxes, belt drives, and other transmission components that require a positive mechanical connection.

The right-angle SpeedTEC DIN connector helps reduce the amount of space required behind the motor compared with a straight connector arrangement.

The connector can be rotated through 180 degrees, giving equipment designers additional flexibility when routing motor cables.

The IEC metric mounting configuration makes the motor suitable for machine structures designed around metric mechanical standards.

8. Brake Configuration

The MPL-B1520U-EJ72AA is a no-brake configuration.

This means the motor does not include an integrated holding brake.

The no-brake design can be advantageous in applications where:

• The axis is horizontal.
• The load does not require mechanical holding while stopped.
• A separate mechanical brake is already installed.
• The machine uses a gearbox or other self-locking mechanism.
• Reduced motor complexity is preferred.

For vertical axes or applications where the load must remain mechanically supported after power is removed, the brake requirement should be evaluated carefully before selecting this model.

9. Product Introduction

The MPL-B1520U-EJ72AA is a precision-oriented industrial servo motor intended for applications where compact dimensions and high-speed dynamic response are important.

Compared with larger conventional motors, its low-inertia design allows the motor to respond quickly to changes in speed and position commands.

The motor is particularly appropriate for automated machinery that repeatedly accelerates, decelerates, indexes, and reverses direction.

The 7000 RPM rating gives the motor enough speed capability for high-cycle automation equipment, while the 50.8 mm magnet stack provides greater torque capability than some shorter motors in the same frame group.

The single-turn high-resolution encoder provides the feedback required for closed-loop positioning and speed regulation.

The absence of an integrated brake keeps the motor configuration relatively straightforward and makes it particularly suitable for horizontal-axis machinery.

10. Main Product Advantages

10.1 High-Speed Operation

The 7000 RPM rating makes the motor suitable for fast-moving automation systems.

Typical benefits include:

• Shorter machine cycle times.
• Faster indexing.
• Rapid acceleration and deceleration.
• Improved machine throughput.
• Better response in repetitive motion.

10.2 Low-Inertia Design

The low-inertia rotor is one of the main characteristics of the MPL series.

A low-inertia motor can change speed rapidly because less rotational energy has to be accelerated or decelerated.

This is useful for:

• Pick-and-place systems.
• Indexing mechanisms.
• Electronic assembly machines.
• Packaging equipment.
• Precision positioning equipment.

10.3 Compact 63 mm Frame

The 63 mm frame provides a compact mechanical package.

This can help equipment designers:

• Reduce machine footprint.
• Install motors in narrow spaces.
• Build smaller automation modules.
• Simplify mechanical layouts.
• Maintain accessibility around the motor.

10.4 50.8 mm Magnet Stack

The 50.8 mm stack length gives the motor additional electromagnetic capability while retaining the compact 63 mm frame.

This makes the model useful when a machine requires more torque than a shorter motor but does not justify moving to a larger frame.

10.5 High-Resolution Feedback

The single-turn high-resolution encoder provides accurate motor-position information.

This supports:

• Precise positioning.
• Stable speed control.
• Repeatable indexing.
• Motion synchronization.
• Closed-loop machine operation.

10.6 Flexible Connector Arrangement

The right-angle connector can be rotated through 180 degrees.

This is useful when:

• Cable routing space is limited.
• The motor is installed close to a machine frame.
• Cable bends need to be controlled.
• Multiple motors are installed close together.

11. Typical Industrial Applications

11.1 Packaging Machinery

The motor can be used for:

• Indexing mechanisms.
• Product feeding.
• Film positioning.
• Labeling equipment.
• Rotary cutting systems.
• High-speed conveying mechanisms.

The rapid acceleration capability is useful when the machine repeatedly starts and stops.

11.2 Electronic Assembly

Potential applications include:

• Component positioning.
• Precision feeding.
• Automated insertion.
• Assembly indexing.
• Inspection mechanisms.

The encoder feedback supports repeatable positioning.

11.3 Semiconductor Equipment

The compact frame makes this type of servo motor suitable for machinery requiring high-density motion control.

Typical applications can include:

• Precision transfer mechanisms.
• Wafer handling.
• Inspection stages.
• Small positioning axes.
• Automated handling modules.

11.4 Material Handling

The motor can be incorporated into:

• Automated conveyor systems.
• Sorting mechanisms.
• Transfer equipment.
• Indexing conveyors.
• Small robotic handling systems.

The exact suitability depends on load inertia, required torque, acceleration, and duty cycle.

11.5 Printing and Converting Equipment

Servo motors are commonly used in applications requiring synchronized rotary movement.

Potential applications include:

• Roller positioning.
• Web handling.
• Cutting mechanisms.
• Registration control.
• Feed mechanisms.

The high-speed feedback system helps maintain synchronization between machine sections.

11.6 Robotics and Pick-and-Place Equipment

The low-inertia design is useful for repeated rapid movements.

Possible applications include:

• Small robotic axes.
• Pick-and-place modules.
• Rotary positioning units.
• Automated inspection mechanisms.
• Compact multi-axis systems.

12. Product Advantages at a Glance

13. Recommended 5 Related Models

The following models are closely related to the MPL-B1520U-EJ72AA in terms of the MPL family, frame structure, voltage class, speed class, feedback configuration, or mechanical configuration.

The closest configuration to the subject model is the MPL-B1520U-EJ74AA, because it retains the same basic 63 mm frame, 50.8 mm stack, and 7000 RPM class while adding a holding-brake configuration.

The MPL-B1530U-EJ72AA is a useful related choice when a longer magnet stack and increased motor capability are required.

14. Recommended 5 Related Models from the Same Brand

The following are useful models to consider when comparing servo-motor solutions within the same manufacturer’s industrial motion product range.

For actual machine replacement work, the encoder type, voltage class, brake configuration, shaft arrangement, connector arrangement, and drive compatibility should be matched rather than selecting a motor based only on physical dimensions.

15. Comparison of the Most Relevant MPL Models

16. Installation Considerations

Before installing an MPL-B1520U-EJ72AA, several factors should be checked.

First, the servo drive must be compatible with the motor’s voltage class and feedback system.

Second, the mechanical coupling must match the keyed shaft dimensions.

Third, sufficient clearance should be provided around the motor and connector.

Fourth, the machine designer should consider the inertia ratio between the motor and driven load.

Fifth, acceleration and deceleration requirements should be evaluated against the motor’s continuous and peak torque capabilities.

Finally, the no-brake configuration should be confirmed as suitable for the machine axis.

For vertical or gravity-loaded axes, the absence of an integrated brake is especially important. An external holding mechanism or an appropriately configured brake motor may be required.

17. Maintenance and Service Considerations

Servo motors generally require less routine mechanical maintenance than many conventional mechanical drive systems, but proper installation and operating conditions remain important.

The motor should be protected from excessive contamination, moisture, shock, vibration, and abnormal mechanical loading.

Cable connections should be inspected periodically, particularly on machines with frequent movement.

The shaft coupling should also be checked for alignment. Misalignment can increase bearing load and may reduce the service life of the motor.

The motor should not be operated beyond the applicable speed, current, temperature, or environmental limits.

If abnormal noise, vibration, temperature rise, or positioning error develops, the motor, feedback system, coupling, cabling, and servo-drive parameters should be inspected as a complete motion-control system.

18. Advantages Compared with a Conventional Motor

A conventional induction motor generally operates with open-loop or relatively simple speed-control methods.

The MPL-B1520U-EJ72AA is intended for closed-loop servo operation.

This provides several differences:

19. Suitable Machine Types

The MPL-B1520U-EJ72AA can be considered for many machine categories, including:

• Automated assembly machines.
• Packaging equipment.
• Electronic manufacturing equipment.
• Precision indexing machines.
• Material-handling systems.
• Semiconductor equipment.
• Printing machinery.
• Inspection equipment.
• Pick-and-place equipment.
• Compact robotic systems.
• Automated test equipment.
• High-speed positioning equipment.

The final motor selection should always be based on actual load torque, inertia, acceleration, speed, duty cycle, environment, and drive compatibility.

20. Product Summary

The MPL-B1520U-EJ72AA is a 460 V AC, 63 mm frame, 50.8 mm magnet-stack, 7000 RPM low-inertia brushless servo motor.

Its principal configuration consists of a single-turn high-resolution encoder, keyed shaft extension, right-angle SpeedTEC DIN connector, 180° connector rotation capability, IEC metric mounting, and no integrated brake.

The motor’s combination of compact dimensions and high-speed capability makes it suitable for precision automation equipment where rapid acceleration, repeatable positioning, and reliable closed-loop motion are required.

The 50.8 mm magnet stack provides a useful step up in motor capability compared with shorter 25.4 mm-stack configurations while retaining the compact 63 mm frame.

For horizontal-axis applications where an integrated holding brake is unnecessary, the no-brake configuration can simplify machine integration.

For applications requiring load holding after stopping, particularly vertical axes, a brake-equipped version or an external mechanical holding solution should be considered.

Overall, the MPL-B1520U-EJ72AA is best viewed as a compact, high-speed, low-inertia servo motor for precision industrial motion systems, especially where machine size, dynamic response, and accurate feedback are important.