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- MPL-B1520U-HJ74AA
- Low-Inertia Brushless Servo Motors Product
- USA
- 63 × 63 × 165 mm
- 1.2kg
- Xiamen, China
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1. Product Overview
The MPL-B1520U-HJ74AA is a low-inertia brushless AC rotary servo motor belonging to the MP-Series MPL servo motor family.
It is designed for industrial motion-control applications that require accurate positioning, controlled speed, rapid acceleration and deceleration, and reliable closed-loop operation.
The motor uses a 63 mm frame size and a 50.8 mm magnet stack, placing it in the compact 15-frame, 20-stack configuration of the MPL family.
The motor is part of the 460 V AC class and has a 7000 rpm speed rating. It uses a 2000-line incremental encoder, a keyed shaft, a right-angle SpeedTEC DIN connector, and an integrated 24 V DC holding brake.
The integrated brake is one of the key characteristics of the HJ74AA configuration. It makes this version particularly useful for axes where the mechanical load needs to be held when servo power is removed.
The motor is a relatively compact solution for automated machinery because the 63 mm frame allows it to fit into machine structures where larger servo motors would take up more space.
The low-inertia construction is also useful in machines with frequent starts and stops. Instead of being designed primarily for very high continuous torque, the motor is intended to provide fast dynamic response in a compact package.
The MPL-B1520U-HJ74AA is a discontinued configuration, so it is especially relevant when identifying or maintaining existing machinery rather than when designing a completely new machine around a current motor platform.
2. Brand and Product Series
| Item | Specification |
|---|---|
| Brand | Allen-Bradley |
| Product Family | MP-Series |
| Product Series | MPL Low-Inertia Brushless Servo Motors |
| Product Type | AC Rotary Servo Motor |
| Model | MPL-B1520U-HJ74AA |
| Motor Construction | Brushless permanent-magnet servo motor |
| Voltage Class | 460 V AC |
| Frame Size | 63 mm |
| Magnet Stack Length | 50.8 mm |
| Speed Class | 7000 rpm |
| Feedback | 2000-line incremental encoder |
| Shaft | Keyed shaft |
| Brake | 24 V DC holding brake |
| Connector | SpeedTEC DIN, right-angle |
| Connector Adjustment | Approximately 180° rotatable |
| Mounting | IEC metric |
| Mounting Type | Type FF / free mounting holes |
| Motor Design | Low inertia |
| Application | Industrial closed-loop motion control |
| Lifecycle | Discontinued configuration |
The MPL series is a family of compact brushless servo motors intended for industrial automation.
The series covers different voltage classes, frame sizes, stack lengths, speed ranges, encoder arrangements, shaft configurations, and brake options.
The MPL-B1520U-HJ74AA represents a particular combination of these characteristics rather than simply being a generic 7000 rpm servo motor.
For replacement purposes, the complete catalog number is therefore important.
3. Detailed Technical Parameters
| Parameter | Specification |
|---|---|
| Model | MPL-B1520U-HJ74AA |
| Brand | Allen-Bradley |
| Series | MP-Series MPL |
| Motor Type | Low-inertia brushless AC rotary servo motor |
| Voltage Class | 460 V AC |
| Armature Voltage | 460 V class |
| Frame Size | 63 mm |
| Magnet Stack | 50.8 mm |
| Stack Designation | 20 |
| Speed Class | 7000 rpm |
| Feedback | 2000-line incremental encoder |
| Encoder Type | Incremental |
| Encoder Resolution | 2000 lines/revolution |
| Shaft Type | Keyed shaft |
| Shaft Seal | No shaft seal in standard configuration |
| Brake | 24 V DC holding brake |
| Brake Configuration | Integrated holding brake |
| Connector | SpeedTEC DIN connector |
| Connector Style | Right-angle |
| Connector Position | Adjustable / rotatable approximately 180° |
| Mounting Flange | IEC metric |
| Mounting Type | Free mounting holes / Type FF |
| Motor Construction | Permanent-magnet brushless |
| Servo Control | Closed-loop |
| Approx. Output Class | 0.27 kW |
| Continuous Stall Torque | Approx. 0.49 Nm |
| Peak Stall Torque | Approx. 1.58 Nm |
| Approx. Continuous Current | Approx. 1.8 A |
| Rotor Design | Low inertia |
| Standard Protection | Approximately IP50 configuration |
| Enhanced Protection | Up to IP66 with appropriate sealing arrangement |
| Approx. Frame Dimensions | 63 × 63 mm |
| Approx. Overall Dimensions | 63 × 63 × 165 mm |
| Approx. Weight | Approx. 1.2 kg |
| Mounting | Flange mounted |
| Rotation | Rotary |
| Typical Application | Industrial servo motion control |
The 63 × 63 × 165 mm dimension should be regarded as an approximate overall envelope rather than a substitute for the mechanical drawing.
The exact shaft projection, flange dimensions, bolt-hole spacing, connector clearance, and cable-bending area are important when designing a machine around this motor.
The approximate motor weight is 1.2 kg.
This relatively low mass is useful for compact machinery and for applications where the motor itself forms part of a moving axis.
4. Model Number Interpretation
The model designation provides useful information about the motor configuration.
| Code | General Configuration |
|---|---|
| MPL | MPL low-inertia brushless servo motor |
| B | 460 V-class motor |
| 15 | 63 mm frame |
| 20 | 50.8 mm magnet stack |
| U | 7000 rpm speed class |
| H | 2000-line incremental encoder |
| J | Keyed shaft |
| 7 | SpeedTEC DIN right-angle connector |
| 4 | 24 V DC holding brake |
| AA | Standard configuration designation |
The most important distinction between this model and many visually similar MPL motors is the H feedback configuration.
The H configuration uses a 2000-line incremental encoder.
The 4 portion of the suffix identifies the brake-equipped configuration.
This means that the motor combines incremental encoder feedback with an integrated 24 V DC holding brake.
5. Feedback System
The MPL-B1520U-HJ74AA uses a 2000-line incremental encoder.
The encoder provides rotational feedback to the servo control system.
During operation, the servo drive uses this feedback to determine how the motor is actually moving compared with the commanded motion.
This allows the system to control motor speed and position through closed-loop operation.
The encoder is especially important for applications involving repeated positioning.
For example, an indexing mechanism may need to move to a specific position, stop, reverse direction, and then repeat the same sequence hundreds or thousands of times.
The encoder allows the control system to monitor the motor’s actual movement rather than simply assuming that the commanded movement has occurred.
When replacing this motor, the feedback type must be considered carefully.
A physically similar MPL motor with a single-turn absolute encoder or multi-turn encoder may require a different control configuration.
6. Integrated 24 V DC Holding Brake
The integrated 24 V DC holding brake is one of the most useful features of the MPL-B1520U-HJ74AA.
The brake is intended primarily to hold the motor shaft in position when the servo motor is not energized.
This is especially useful on vertical axes.
Consider a vertical positioning mechanism carrying a load.
When the servo motor is energized, the motor torque can maintain the position.
When power is removed, gravity can cause the load to move unless another holding mechanism is provided.
The integrated brake provides a means of mechanically holding the motor shaft when the servo system is not producing motor torque.
Typical applications include:
- Vertical positioning axes
- Lifting mechanisms
- Z-axis systems
- Automated slides
- Gravity-loaded mechanisms
- Indexing systems requiring holding after stopping
- Positioning stages
- Machine mechanisms that must remain stationary during power-off conditions
The brake should be treated as a holding device rather than automatically as the primary emergency stopping system.
Machine safety functions should be designed independently according to the requirements of the complete equipment.
7. Low-Inertia Motor Design
The low-inertia design is a central characteristic of the MPL family.
Motor rotor inertia affects how quickly the motor can accelerate and decelerate.
A lower-inertia rotor generally requires less torque to change its own rotational speed.
This makes the motor particularly useful for applications involving rapid changes in speed.
For example, an indexing machine may repeatedly accelerate from zero speed, reach a high speed, decelerate, stop, and reverse.
A low-inertia motor is well suited to this type of motion profile.
The actual performance still depends on the connected load.
A machine with extremely high reflected inertia may require a larger motor, gearing, or a different mechanical arrangement.
8. 7000 RPM Speed Class
The motor belongs to the 7000 rpm speed class.
This provides a relatively high rotational speed for a compact servo motor.
High motor speed can be useful in direct-drive rotary mechanisms as well as in applications using gear reduction.
When a gearbox is used, the motor can operate at a relatively high speed while the gearbox reduces the output speed and increases available output torque.
The actual machine speed should always be calculated from the motor speed, transmission ratio, load requirements, acceleration profile, and duty cycle.
9. Mechanical Construction
The motor uses a 63 mm frame with a 50.8 mm magnet stack.
The frame provides the basic mechanical mounting envelope, while the stack length is related to the active electromagnetic length of the motor.
The 20-stack configuration is longer than a 10-stack motor in the same frame family and shorter than a 30-stack configuration.
This gives machine designers different choices within the same general 63 mm frame size.
The keyed shaft allows the motor to connect to a suitable coupling, gearbox, pulley, or other transmission component.
Correct shaft alignment is important.
Misalignment can increase bearing loads, create vibration, and reduce motor service life.
10. Connector Design
The motor uses a right-angle SpeedTEC DIN connector.
The connector arrangement can be rotated through approximately 180 degrees.
This is particularly useful when the motor is installed in a compact machine.
Cable routing can sometimes become difficult when several servo motors are mounted close together.
The right-angle connector helps reduce the required clearance around the rear of the motor.
The connector should still be protected against excessive mechanical force.
The cable should not be used to support the motor or subjected to continuous pulling, twisting, or sharp bending.
11. Environmental Protection
The standard configuration is associated with an approximately IP50 protection level.
For more demanding environments, additional sealing provisions can be used.
With the appropriate shaft seal and environmentally sealed cable connections, protection can be increased to a higher level, including an IP66-type configuration.
This distinction is important for machinery exposed to:
- Dust
- Coolant
- Moisture
- Washdown
- Industrial fluids
- Fine particles
- High-humidity environments
The motor’s actual environmental suitability depends on the complete installed configuration rather than the motor body alone.
12. Product Applications
12.1 Packaging Equipment
The motor is well suited to packaging machinery where fast and repeatable positioning is required.
Typical applications include indexing, product feeding, film handling, cutting mechanisms, labeling, sealing, and synchronized conveyor movement.
The low-inertia design is useful when the machine operates with frequent acceleration and deceleration.
The holding brake can also be useful on vertical or mechanically loaded axes.
12.2 Automated Assembly Machines
Assembly machines often require multiple servo axes operating in a carefully coordinated sequence.
The MPL-B1520U-HJ74AA can be applied to rotary positioning, indexing mechanisms, feeders, transfer mechanisms, and other controlled axes.
The incremental encoder allows the servo system to monitor actual motor movement.
12.3 Vertical Positioning Systems
The integrated brake makes this motor particularly relevant to vertical-axis applications.
A vertical slide, lift, or positioning mechanism may require the motor to maintain position when the servo is disabled.
The holding brake can provide this mechanical holding function.
The final machine design must still consider load mass, mechanical transmission, safety requirements, brake torque, and failure conditions.
12.4 Material Handling
Automated material-handling equipment frequently uses servo motors for precise positioning.
Applications can include:
- Transfer units
- Indexing conveyors
- Pick-and-place mechanisms
- Feed systems
- Positioning tables
- Automated storage mechanisms
The compact motor size is useful where machine space is limited.
12.5 Printing and Converting Equipment
Servo motors are frequently used for synchronized rotary motion in printing and converting equipment.
The motor can be used for controlled rollers, indexing mechanisms, web-handling systems, and auxiliary rotary axes.
The feedback system allows the control system to monitor actual motor movement and maintain synchronization.
12.6 Rotary Indexing Machines
Indexing tables require controlled acceleration, rapid stopping, and repeatable positioning.
The 7000 rpm speed class and low-inertia construction make this type of application a natural fit.
The motor may be connected directly to the mechanism or used with a reduction gearbox.
12.7 Electronics and Precision Automation
Automated electronics equipment often uses small servo motors because machine dimensions must be kept compact.
The 63 mm frame provides a relatively small installation footprint.
The encoder feedback allows controlled positioning, while the low-inertia rotor helps support rapid movement.
13. Main Product Advantages
13.1 Compact Mechanical Size
The 63 mm frame provides a compact motor package.
This is valuable for machines with limited installation space.
In multi-axis equipment, compact servo motors can also help reduce spacing between adjacent axes.
13.2 High-Speed Operation
The 7000 rpm speed class provides high rotational speed for a compact motor.
This can be useful in high-cycle automation and indexing applications.
13.3 Low-Inertia Response
The low-inertia construction supports rapid acceleration and deceleration.
This is one of the main advantages of this type of servo motor over larger, higher-inertia motor constructions.
13.4 Incremental Encoder Feedback
The 2000-line incremental encoder supports closed-loop control.
This allows the servo system to continuously monitor motor movement.
13.5 Integrated Holding Brake
The 24 V DC brake is useful when the machine needs to hold the axis after servo power is removed.
This is particularly relevant to vertical and gravity-loaded applications.
13.6 Keyed Shaft
The keyed shaft provides a conventional mechanical interface.
It can be used with suitable couplings, gearboxes, pulleys, and other mechanical transmission components.
13.7 Rotatable Right-Angle Connector
The connector can be adjusted to improve cable routing.
This can make mechanical installation easier in compact machine layouts.
13.8 Brushless Construction
The brushless permanent-magnet design eliminates mechanical brushes and a mechanical commutator.
This reduces the type of wear associated with brushed DC motors.
The motor still requires appropriate inspection of bearings, cables, connectors, mounting, and environmental sealing as part of machine maintenance.
14. Five Closely Related MPL Models
The following models are useful for comparison because they belong to the same general MPL family and share closely related configurations.
| Model | Voltage | Frame | Stack | Speed | Feedback | Brake | Approx. Dimensions | Approx. Weight |
|---|---|---|---|---|---|---|---|---|
| MPL-B1520U-HJ72AA | 460 V | 63 mm | 50.8 mm | 7000 rpm | 2000-line incremental | No | Approx. 63 × 63 × 165 mm | Approx. 1.2 kg |
| MPL-B1520U-EJ74AA | 460 V | 63 mm | 50.8 mm | 7000 rpm | Single-turn high-resolution | 24 V DC | Approx. 63 × 63 × 165 mm | Approx. 1.2 kg |
| MPL-B1520U-VJ74AA | 460 V | 63 mm | 50.8 mm | 7000 rpm | Multi-turn high-resolution | 24 V DC | Approx. 63 × 63 × 165 mm | Approx. 1.2 kg |
| MPL-B1530U-HJ74AA | 460 V | 63 mm | 76.2 mm | 7000 rpm | 2000-line incremental | 24 V DC | Approx. 63 × 63 mm frame, longer body | Approx. 1.5 kg |
| MPL-B1510V-HJ74AA | 460 V | 63 mm | 25.4 mm | 8000 rpm | 2000-line incremental | 24 V DC | Approx. 63 × 63 mm frame, shorter body | Approx. 1.0 kg |
The MPL-B1520U-HJ72AA is the closest non-brake counterpart to the target motor.
The MPL-B1520U-EJ74AA has the same general frame, stack, speed and brake arrangement but uses a different high-resolution feedback configuration.
The MPL-B1520U-VJ74AA provides a multi-turn high-resolution feedback arrangement.
The MPL-B1530U-HJ74AA uses the same general 7000 rpm and incremental-feedback concept but has a longer magnet stack.
The MPL-B1510V-HJ74AA uses a shorter 25.4 mm stack and a higher 8000 rpm speed class.
These differences are important when selecting a replacement because the motor’s torque, feedback, speed and mechanical envelope can all change.
15. Five Same-Brand Models for Comparison
The following models are additional examples from the same brand’s servo-motor range and are useful when comparing different motor configurations.
| Model | Series | Voltage | Frame / Stack | Speed | Feedback | Brake | Approx. Dimensions | Approx. Weight |
|---|---|---|---|---|---|---|---|---|
| MPL-B1510V-EJ74AA | MP-Series MPL | 460 V | 63 mm / 25.4 mm | 8000 rpm | Single-turn high-resolution | 24 V DC | Approx. 63 × 63 mm frame, short body | Approx. 1.0 kg |
| MPL-B1520U-EJ74AA | MP-Series MPL | 460 V | 63 mm / 50.8 mm | 7000 rpm | Single-turn high-resolution | 24 V DC | Approx. 63 × 63 × 165 mm | Approx. 1.2 kg |
| MPL-B1520U-VJ74AA | MP-Series MPL | 460 V | 63 mm / 50.8 mm | 7000 rpm | Multi-turn high-resolution | 24 V DC | Approx. 63 × 63 × 165 mm | Approx. 1.2 kg |
| MPL-B1530U-EJ74AA | MP-Series MPL | 460 V | 63 mm / 76.2 mm | 7000 rpm | Single-turn high-resolution | 24 V DC | Approx. 63 × 63 mm frame, longer body | Approx. 1.5 kg |
| MPL-B220T-EJ74AA | MP-Series MPL | 460 V | Larger frame / 50.8 mm stack class | 6000 rpm class | Single-turn high-resolution | 24 V DC | Larger than 63 mm frame | Approx. 2 kg class |
These models cover different motor configurations and provide a useful comparison when determining whether the original motor’s frame, feedback and speed characteristics are appropriate for a particular machine.
The smaller 1510V configuration emphasizes a shorter stack and higher speed.
The 1520U configurations provide the 50.8 mm stack and 7000 rpm speed class.
The 1530U configuration uses a longer 76.2 mm stack and is intended for applications requiring a different torque capability within the same general frame family.
The larger-frame 220T configuration provides a substantially different mechanical size and should be considered when the application requires a larger motor.
16. Comparison with MPL-B1520U-HJ72AA
The MPL-B1520U-HJ72AA is one of the most closely related models.
| Parameter | MPL-B1520U-HJ72AA | MPL-B1520U-HJ74AA |
|---|---|---|
| Voltage Class | 460 V | 460 V |
| Frame | 63 mm | 63 mm |
| Stack | 50.8 mm | 50.8 mm |
| Speed | 7000 rpm | 7000 rpm |
| Feedback | 2000-line incremental | 2000-line incremental |
| Shaft | Keyed | Keyed |
| Connector | SpeedTEC DIN, right-angle | SpeedTEC DIN, right-angle |
| Brake | No brake | 24 V DC holding brake |
| Mounting | IEC metric | IEC metric |
| Approx. Dimensions | Approx. 63 × 63 × 165 mm | Approx. 63 × 63 × 165 mm |
| Approx. Weight | Approx. 1.2 kg | Approx. 1.2 kg |
These two models are mechanically very close.
The major configuration difference is the integrated holding brake.
The HJ72AA is the brake-free version, while the HJ74AA adds a 24 V DC holding brake.
For a vertical axis, this distinction can be significant.
A machine originally designed around the HJ74AA should not automatically be converted to an HJ72AA unless an appropriate external holding arrangement is provided.
17. Comparison with MPL-B1520U-EJ74AA
The MPL-B1520U-EJ74AA is another closely related model.
| Parameter | MPL-B1520U-HJ74AA | MPL-B1520U-EJ74AA |
|---|---|---|
| Voltage | 460 V class | 460 V class |
| Frame | 63 mm | 63 mm |
| Stack | 50.8 mm | 50.8 mm |
| Speed | 7000 rpm | 7000 rpm |
| Feedback | 2000-line incremental | Single-turn high-resolution |
| Shaft | Keyed | Keyed |
| Brake | 24 V DC | 24 V DC |
| Connector | SpeedTEC DIN | SpeedTEC DIN |
| Mounting | IEC metric | IEC metric |
| Approx. Dimensions | 63 × 63 × 165 mm | 63 × 63 × 165 mm |
| Approx. Weight | Approx. 1.2 kg | Approx. 1.2 kg |
The primary distinction is the encoder.
The HJ74AA uses a 2000-line incremental encoder, while the EJ74AA uses a single-turn high-resolution encoder.
This means that the servo drive and motion-control configuration must be considered before treating one as a replacement for the other.
18. Application Selection Guide
| Application | Main Requirement | Suitability of MPL-B1520U-HJ74AA |
|---|---|---|
| Packaging | Fast repetitive movement | Suitable |
| Indexing | Rapid acceleration and positioning | Suitable |
| Assembly | Repeatable positioning | Suitable |
| Vertical axis | Position holding | Suitable, with integrated brake |
| Material handling | Controlled acceleration | Suitable |
| Feed mechanism | Repeated short movements | Suitable |
| Rotary table | Accurate indexing | Suitable |
| Printing | Synchronized rotary motion | Suitable |
| Converting | Speed and synchronization | Suitable |
| Pick-and-place | Low inertia and rapid movement | Suitable |
| Auxiliary machine axis | Compact closed-loop servo | Suitable |
| Heavy continuous load | High continuous torque | Motor sizing should be evaluated carefully |
The last category is particularly important.
Although the motor is capable of high-speed operation, a high-speed motor should not automatically be selected for a heavy continuous-load application.
The complete torque-speed curve, duty cycle, load inertia and acceleration requirement should be evaluated.
19. Advantages in Automated Machinery
The MPL-B1520U-HJ74AA combines several characteristics that are useful in automated production equipment.
Its compact frame helps reduce the physical size of the motion axis.
Its low-inertia rotor helps the servo system respond quickly to speed commands.
Its incremental encoder provides closed-loop feedback.
Its 7000 rpm speed class supports high-speed machine operation.
Its integrated brake provides a useful holding function for appropriate applications.
The keyed shaft simplifies mechanical integration with common transmission components.
The adjustable right-angle connector provides additional flexibility when routing servo cables.
Taken together, these characteristics make the motor suitable for a broad range of compact industrial motion applications.
20. Maintenance and Service Considerations
Routine inspection should include the motor mounting, coupling, shaft, connector, cable, and surrounding mechanical structure.
Abnormal vibration should be investigated rather than ignored.
A change in bearing noise, motor temperature, encoder behavior, or brake operation can indicate a developing mechanical or electrical problem.
The holding brake should also be checked periodically where the application depends on the brake for load holding.
The brake should not be continuously used as a dynamic stopping device unless the system has been specifically designed for that purpose.
Cable condition is also important.
Servo cables should be protected from sharp edges, moving machine components, excessive bending, heat and chemical exposure.
For installations exposed to moisture or washdown, the shaft seal and connector sealing arrangement should be inspected carefully.
21. Replacement Considerations
Because the MPL-B1520U-HJ74AA is a discontinued configuration, replacement work requires more attention than a normal same-model purchase.
The first consideration is the motor’s voltage class.
The replacement should be compatible with the servo drive and its supply architecture.
The second consideration is the feedback system.
The original HJ74AA uses a 2000-line incremental encoder.
A replacement using a different encoder technology may require different drive settings, wiring or control hardware.
The third consideration is the holding brake.
The original motor has an integrated 24 V DC brake.
If the machine uses the brake for vertical load holding, the replacement should provide an equivalent holding arrangement.
The fourth consideration is the shaft.
The keyed shaft must match the coupling and driven equipment.
The fifth consideration is the mechanical envelope.
The frame and stack dimensions should be checked together with shaft length, flange dimensions and connector clearance.
22. Technical Summary
| Category | MPL-B1520U-HJ74AA |
|---|---|
| Model | MPL-B1520U-HJ74AA |
| Brand | Allen-Bradley |
| Product Family | MP-Series |
| Product Series | MPL Low-Inertia Brushless Servo Motors |
| Motor Type | AC rotary servo motor |
| Voltage Class | 460 V AC |
| Frame Size | 63 mm |
| Magnet Stack | 50.8 mm |
| Speed | 7000 rpm |
| Output Class | Approx. 0.27 kW |
| Continuous Stall Torque | Approx. 0.49 Nm |
| Peak Stall Torque | Approx. 1.58 Nm |
| Feedback | 2000-line incremental encoder |
| Shaft | Keyed |
| Brake | 24 V DC holding brake |
| Connector | Right-angle SpeedTEC DIN |
| Connector Rotation | Approx. 180° |
| Mounting | IEC metric Type FF |
| Standard Protection | Approx. IP50 |
| Enhanced Protection | Up to IP66 with suitable sealing configuration |
| Approx. Dimensions | 63 × 63 × 165 mm |
| Approx. Weight | Approx. 1.2 kg |
| Motor Design | Low inertia, brushless permanent magnet |
| Typical Uses | Packaging, indexing, assembly, material handling, printing, positioning and automated machinery |
| Lifecycle | Discontinued |
23. Final Product Description
The MPL-B1520U-HJ74AA is a compact low-inertia AC servo motor designed for high-speed closed-loop industrial motion control.
With a 63 mm frame, 50.8 mm magnet stack, and 7000 rpm speed class, it is intended for applications where the machine requires fast and repeatable rotary movement without using a large motor package.
Its 2000-line incremental encoder provides feedback to the servo system, allowing the controller to regulate actual motor movement.
The integrated 24 V DC holding brake makes the motor particularly useful for applications where the axis must remain stationary after the servo motor is de-energized.
The keyed shaft provides a practical mechanical interface for common industrial transmission components, while the right-angle SpeedTEC DIN connector provides additional flexibility for cable routing in compact machinery.
The approximate overall dimensions are 63 × 63 × 165 mm, and the motor weighs approximately 1.2 kg.
The motor is especially suitable for packaging equipment, assembly machinery, indexing systems, material-handling equipment, feeders, positioning mechanisms, printing equipment and other automated machines requiring controlled rotary motion.
For replacement applications, the most important characteristics to match are the 460 V voltage class, 63 mm frame, 50.8 mm stack, 7000 rpm speed, 2000-line incremental encoder, keyed shaft, right-angle connector and 24 V DC holding brake.
Because the HJ74AA configuration is discontinued, the exact part number and complete drive/motor combination should be checked carefully when maintaining an existing machine.
The motor should therefore be viewed not simply as a 7000 rpm servo motor, but as a specific 63 mm, 50.8 mm-stack, 460 V-class, incremental-feedback, brake-equipped MPL servo configuration.
That combination of compact dimensions, low rotor inertia, high rotational speed, incremental feedback and integrated holding brake is the defining characteristic of the MPL-B1520U-HJ74AA.