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Allen-Bradley MPL-B320P-RJ74AA Servo Motor – Detailed Product Description, Specifications, Applications, Advantages and Related Models
1. Product Overview
The Allen-Bradley MPL-B320P-RJ74AA is a high-performance AC rotary servo motor from the MP-Series MPL low-inertia servo motor family. It is designed for industrial motion-control applications where accurate positioning, controlled acceleration and deceleration, high rotational speed, and repeatable machine movement are required.
The MPL-B320P-RJ74AA uses a low-inertia brushless servo motor construction with a 100 mm frame size, 50.8 mm magnetic stack length, 5000 RPM rated speed, resolver feedback, a keyed shaft extension, and a 24 V DC holding brake.
The motor is intended to operate as part of a coordinated servo system rather than as a conventional standalone induction motor. When matched with an appropriate servo drive and motion controller, it can provide controlled torque, speed, acceleration, deceleration, and positioning for automated machinery.
The model is particularly suited to machines where the motor must respond quickly to changing motion commands. The relatively low rotor inertia helps the servo system accelerate and decelerate efficiently, while the resolver provides feedback to the control system for closed-loop operation.
The MPL-B320P-RJ74AA is also equipped with a right-angle SpeedTEC DIN connector. The connector can be rotated through 180 degrees, giving machine designers additional flexibility when routing motor cables in compact machine structures.
The integrated 24 V DC brake is an important feature of this model. It can be used to help hold the motor shaft when the servo system is stopped or when the application requires additional holding capability.
The motor uses an IEC metric mounting configuration and a keyed shaft arrangement, making it suitable for applications where a conventional keyed mechanical connection is preferred.
2. Basic Product Parameters
| Parameter | Specification |
|---|---|
| Model | MPL-B320P-RJ74AA |
| Brand | Allen-Bradley |
| Product Type | AC Rotary Servo Motor |
| Product Family | MP-Series MPL |
| Series Type | Low-Inertia Servo Motor |
| Motor Construction | Brushless Permanent-Magnet Servo Motor |
| Voltage Class | 400 V AC class |
| Armature Voltage | 460 V |
| Product Rating | 480 V AC |
| Rated Power | 1.5 kW |
| Rated Speed | 5000 RPM |
| Maximum Speed | 5000 RPM |
| Continuous Stall Torque | 3.05 N·m |
| Peak Stall Torque | 7.91 N·m |
| Feedback | Resolver |
| Resolver Type | 2-pole resolver |
| Shaft | Keyed shaft extension |
| Shaft Seal | No shaft seal |
| Brake | 24 V DC holding brake |
| Connector | SpeedTEC DIN |
| Connector Orientation | Right-angle |
| Connector Rotation | 180° rotatable |
| Mounting | IEC metric flange |
| Frame Size | 100 mm |
| Magnetic Stack Length | 50.8 mm |
| Number of Phases | 3-phase servo motor |
| Duty | S1 continuous-duty type |
| Rotor Inertia | Approx. 0.000078 kg·m² |
| Operating Temperature Reference | Up to approximately 40 °C |
| Approx. Dimensions | Approx. 42.8 × 21.7 × 26.0 cm, B320P family reference |
| Weight | Approx. 6.8 kg |
| Brake Supply | 24 V DC |
| Shaft Configuration | Keyed |
| Mounting Hole Type | Free mounting holes, Type FF |
| Product Status | Active Mature |
The principal configuration of this motor is a 460 V-class, 100 mm-frame, 50.8 mm-stack servo motor rated for 5000 RPM. The combination of 1.5 kW output and 3.05 N·m continuous stall torque gives the motor a useful balance between speed and torque for general industrial motion applications.
The approximately 6.8 kg weight refers to a listed configuration of the RJ74AA model with its brake arrangement. Physical dimensions can vary slightly depending on the exact mechanical configuration and measurement method, so the dimensional value above should be treated as a B320P-family reference rather than a substitute for the installation drawing.
3. Meaning of the MPL-B320P-RJ74AA Model Number
The model number contains several configuration identifiers. Understanding the code is useful when selecting a replacement motor or comparing different MPL configurations.
| Code Section | Meaning |
|---|---|
| MPL | MPL low-inertia brushless servo motor family |
| B | 460 V-class motor family |
| 3 | Frame size 3 / approximately 100 mm frame |
| 20 | 50.8 mm magnetic stack length |
| P | 5000 RPM speed class |
| R | Resolver feedback |
| J | Keyed shaft extension |
| 7 | SpeedTEC DIN right-angle connector, 180° rotatable |
| 4 | 24 V DC brake |
| AA | Standard catalog configuration |
This model-code structure makes the RJ74AA version easy to distinguish from similar B320P motors. For example, an RJ72AA configuration uses the same basic resolver and keyed-shaft arrangement but does not include the 24 V DC brake, while RJ74AA adds the brake option.
4. Detailed Technical Specifications
4.1 Motor Performance
| Parameter | MPL-B320P-RJ74AA |
|---|---|
| Model | MPL-B320P-RJ74AA |
| Rated Output | 1.5 kW |
| Rated Speed | 5000 RPM |
| Maximum Speed | 5000 RPM |
| Continuous Stall Torque | 3.05 N·m |
| Peak Stall Torque | 7.91 N·m |
| Rotor Inertia | Approx. 0.000078 kg·m² |
| Frame Size | 100 mm |
| Magnetic Stack | 50.8 mm |
| Approx. Dimensions | 42.8 × 21.7 × 26.0 cm, family reference |
| Weight | Approx. 6.8 kg |
The 1.5 kW rating makes the B320P size a useful middle-range motor within the B-series MPL family. Its 5000 RPM operating class makes it appropriate for applications where both speed and controlled torque are important. The published B320P family data gives approximately 3.05 N·m continuous stall torque and 7.91 N·m peak stall torque.
5. Electrical Characteristics
| Electrical Parameter | Specification |
|---|---|
| Model | MPL-B320P-RJ74AA |
| Motor Type | AC Brushless Servo Motor |
| Voltage Class | 400 V AC class |
| Armature Voltage | 460 V |
| Product Voltage Rating | 480 V AC |
| Rated Power | 1.5 kW |
| Phase | 3-phase |
| Feedback | Resolver |
| Brake Voltage | 24 V DC |
| Brake Type | Holding brake |
| Rated Speed | 5000 RPM |
| Maximum Speed | 5000 RPM |
| Duty | S1 |
| Approx. Dimensions | 42.8 × 21.7 × 26.0 cm, family reference |
| Weight | Approx. 6.8 kg |
The motor is intended for use with a compatible servo drive and motion-control system. The motor itself provides the electromechanical conversion while the drive regulates the current, torque, speed, and positioning functions.
The 24 V DC brake should be controlled according to the requirements of the complete servo system. It should not be treated as a substitute for a machine safety system or an independently engineered mechanical safety device.
6. Mechanical Characteristics
| Mechanical Parameter | Specification |
|---|---|
| Model | MPL-B320P-RJ74AA |
| Frame Size | 100 mm |
| Frame Class | Frame 3 |
| Magnetic Stack Length | 50.8 mm |
| Shaft Type | Keyed shaft |
| Shaft Seal | No shaft seal |
| Mounting | IEC metric flange |
| Mounting Hole Style | Free mounting holes, Type FF |
| Connector | SpeedTEC DIN |
| Connector Style | Right-angle |
| Connector Rotation | 180° |
| Brake | 24 V DC holding brake |
| Approx. Overall Dimensions | 42.8 × 21.7 × 26.0 cm, family reference |
| Weight | Approx. 6.8 kg |
The keyed shaft is useful when the motor is mechanically coupled to a pulley, coupling, gearbox, lead screw, indexing mechanism, or other rotating machine element that uses a keyed transmission arrangement.
The absence of a shaft seal should also be considered during machine design. If the motor is installed in an environment where liquid, coolant, dust, washdown exposure, or other contamination may reach the shaft area, the mechanical installation should be designed accordingly.
7. Resolver Feedback System
One of the defining characteristics of the MPL-B320P-RJ74AA is its resolver feedback.
A resolver is an electromechanical position-feedback device used to provide rotor position information to the servo drive. It is well suited to industrial environments where robust feedback operation is important.
The resolver arrangement gives the control system information required for closed-loop motor control. This allows the drive to regulate motor movement rather than simply applying a fixed voltage or frequency.
For industrial machinery, resolver feedback can be attractive in applications where reliability and resistance to demanding operating conditions are important.
Compared with simple open-loop motor operation, the closed-loop servo arrangement provides substantially greater control over acceleration, deceleration, position, and torque.
8. 24 V DC Holding Brake
The RJ74AA suffix identifies the brake-equipped configuration.
The motor includes a 24 V DC holding brake, which is designed to help hold the motor shaft when the motor is not actively producing torque.
This feature can be useful in vertical-axis machinery. For example, if a servo motor drives a vertical slide, lifting mechanism, positioning axis, or other load that can move under gravity, a holding brake can provide an additional means of maintaining the shaft position when the servo is disabled.
The brake should be integrated into the machine’s control and safety design. Servo motor brakes are generally intended as holding devices rather than as high-cycle dynamic stopping brakes.
The brake is also one of the main differences between the RJ74AA and RJ72AA versions.
9. SpeedTEC DIN Connector
The motor uses a SpeedTEC DIN connector with a right-angle configuration.
The connector can be rotated through 180 degrees, providing greater flexibility when the motor is installed inside a compact machine.
This is particularly useful in machines where the motor is mounted close to a frame, gearbox, enclosure, linear actuator, or guarding structure.
Cable routing is an important part of servo installation. The connector should not be subjected to excessive mechanical force, sharp bending, repeated twisting, or unsupported cable weight.
A properly supported servo cable can reduce mechanical stress at the motor connector and help improve long-term reliability.
10. Low-Inertia Motor Design
The MPL-B320P belongs to the low-inertia servo motor family.
Low rotor inertia is important in high-performance motion control because the servo drive can accelerate and decelerate the rotor more quickly than a motor with a substantially larger rotating mass.
The B320P family has a published rotor inertia of approximately 0.000078 kg·m².
This characteristic is especially useful when the application involves frequent starts and stops, rapid direction changes, short indexing movements, or repeated positioning cycles.
A low-inertia motor can also make servo tuning more responsive when the motor and load inertia are properly matched.
However, the motor should not be selected based on motor inertia alone. The complete mechanical load, reflected inertia, gearbox ratio, coupling stiffness, load torque, acceleration requirements, and machine dynamics must also be considered.
11. Product Introduction
The Allen-Bradley MPL-B320P-RJ74AA is a compact industrial servo motor intended for precise machine motion.
Its 1.5 kW output, 5000 RPM speed rating, resolver feedback, keyed shaft, and 24 V DC brake make it a versatile configuration within the MPL B320P family.
The motor is particularly useful where the machine requires controlled rotary motion rather than simple constant-speed operation.
Typical servo functions include:
- Position control
- Speed control
- Torque control
- Electronic gearing
- Electronic camming
- Indexing
- Coordinated multi-axis movement
- Controlled acceleration
- Controlled deceleration
- Repetitive positioning
- Synchronization with other machine axes
The motor is therefore suitable for many types of automated production equipment.
12. Main Applications
12.1 Packaging Machinery
The MPL-B320P-RJ74AA can be used in packaging equipment where servo-controlled motion is required for indexing, feeding, cutting, sealing, labeling, or product handling.
The 5000 RPM speed class is useful for fast repetitive cycles, while the low-inertia construction helps the motor respond rapidly to repeated movement commands.
12.2 Material Handling Equipment
Servo motors are widely used for controlled conveyors, transfer mechanisms, positioning units, rollers, and automated handling systems.
The keyed shaft can simplify connection to conventional mechanical transmission components.
The integrated brake can also be useful in vertical or inclined mechanisms where additional shaft holding capability is required.
12.3 Automated Assembly Machines
Assembly equipment often requires accurate positioning and repeatable motion.
The MPL-B320P-RJ74AA can be used for indexing tables, rotary stations, actuators, feeders, tooling mechanisms, and other machine axes.
Resolver feedback allows the motion-control system to maintain closed-loop control of the motor.
12.4 Machine Tools
The motor can be applied to machine-tool auxiliary axes and other controlled motion mechanisms where speed, repeatability, and controlled acceleration are important.
Typical applications can include auxiliary positioning, indexing, material movement, tool handling, and other servo-driven mechanisms.
12.5 Printing and Converting Equipment
Printing and converting machinery frequently requires synchronized motion between multiple shafts or machine sections.
Servo motors are suitable for applications involving precise speed matching, electronic gearing, registration control, indexing, and coordinated movement.
The low-inertia construction of the MPL family can be beneficial for rapid response.
12.6 Labeling Machines
Labeling equipment often performs high-speed repetitive operations.
The motor can be used for controlled rollers, feed mechanisms, indexing systems, or other rotary axes.
The 5000 RPM speed class gives the machine designer considerable speed capability, subject to the actual load and drive configuration.
12.7 Semiconductor and Electronics Equipment
Electronics manufacturing machinery often requires precise and repeatable movement.
The motor can be used in automated handling, indexing, positioning, feeding, and rotary mechanisms where servo control is required.
The exact suitability depends on environmental requirements, cleanliness requirements, load characteristics, and the mechanical configuration of the equipment.
13. Main Advantages
13.1 High-Speed Operation
The motor is rated for 5000 RPM.
This allows it to support applications requiring relatively high rotational speed without moving into a lower-speed motor configuration.
13.2 Good Torque Capability
The B320P family provides approximately 3.05 N·m continuous stall torque and 7.91 N·m peak stall torque.
This gives the motor useful overload capability for short-duration acceleration and demanding motion events.
13.3 Low Rotor Inertia
The low rotor inertia helps the servo system respond rapidly.
This can be especially valuable in machines with frequent acceleration and deceleration cycles.
13.4 Resolver Feedback
Resolver feedback provides closed-loop position information to the servo system.
It is a mature feedback technology widely used in industrial motion-control systems.
13.5 Integrated Holding Brake
The 24 V DC brake is one of the major advantages of the RJ74AA configuration.
It can help maintain shaft position when the motor is not actively driving the load.
13.6 Keyed Shaft
The keyed shaft provides a familiar mechanical connection method.
This is convenient when the machine uses conventional keyed couplings, pulleys, gears, or other transmission components.
13.7 Flexible Connector Orientation
The right-angle SpeedTEC DIN connector can be rotated through 180 degrees.
This helps machine designers manage cable routing in restricted installation spaces.
13.8 Compact 100 mm Frame
The 100 mm frame size provides a useful balance between motor output and machine footprint.
It can fit into many industrial machine designs without requiring the physical envelope of a larger servo motor.
14. Installation Considerations
When installing the MPL-B320P-RJ74AA, the motor should be mounted on a rigid and properly aligned surface.
Mechanical alignment is particularly important in servo systems because misalignment can produce additional bearing loads, coupling stress, vibration, and unnecessary servo errors.
The coupling should be correctly selected for the application.
The shaft key should be installed correctly, and the coupling should not be forced onto the shaft using excessive impact or improper tools.
The motor cable should be supported so that connector loads are minimized.
The brake wiring should be connected according to the servo system’s electrical design.
The brake should not be repeatedly engaged and released in a manner that exceeds its intended operating characteristics.
15. Servo Tuning Considerations
The MPL-B320P-RJ74AA is a low-inertia motor, so the complete motor-load combination should be evaluated when configuring the servo drive.
Important factors include:
- Motor inertia
- Load inertia
- Reflected inertia
- Gear ratio
- Acceleration rate
- Deceleration rate
- Mechanical stiffness
- Coupling flexibility
- Load torque
- Required positioning accuracy
- Required settling time
- Machine resonance
- Operating speed
A good servo system is not determined by the motor alone.
The drive, motor, feedback system, mechanical transmission, and machine load should be treated as one complete motion-control system.
16. Maintenance Considerations
The motor is designed for industrial use, but correct mechanical and electrical installation remains important.
Maintenance personnel should periodically inspect:
- Motor mounting bolts
- Coupling condition
- Shaft and key condition
- Cable condition
- Connector condition
- Brake operation
- Excessive vibration
- Unusual mechanical noise
- Motor temperature
- Servo following error
- Positioning performance
- Mechanical alignment
The absence of a shaft seal should also be considered during maintenance planning, especially where the motor operates near coolant, oil, water, or other contaminants.
17. Five Related or Same-Series Models
The following models are closely related to the MPL-B320P-RJ74AA and can be considered when selecting a different feedback, shaft, or brake configuration.
| Model | Feedback | Shaft | Brake | Speed | Power | Continuous Torque | Frame / Stack | Approx. Dimensions | Weight |
|---|---|---|---|---|---|---|---|---|---|
| MPL-B320P-RJ74AA | Resolver | Keyed | 24 V DC | 5000 RPM | 1.5 kW | 3.05 N·m | 100 mm / 50.8 mm | Approx. 42.8 × 21.7 × 26.0 cm | Approx. 6.8 kg |
| MPL-B320P-RJ72AA | Resolver | Keyed | No brake | 5000 RPM | 1.5 kW | 3.05 N·m | 100 mm / 50.8 mm | Approx. 42.8 × 21.7 × 26.0 cm | Approx. 3.85 kg |
| MPL-B320P-RK74AA | Resolver | Keyless | 24 V DC | 5000 RPM | 1.5 kW | 3.05 N·m | 100 mm / 50.8 mm | Approx. 42.8 × 21.7 × 26.0 cm | Approx. 6.8 kg |
| MPL-B320P-RK72AA | Resolver | Keyless | No brake | 5000 RPM | 1.5 kW | 3.05 N·m | 100 mm / 50.8 mm | Approx. 42.8 × 21.7 × 26.0 cm | Approx. 3.7–3.9 kg |
| MPL-B320P-MJ74AA | Multi-turn absolute encoder | Keyed | 24 V DC | 5000 RPM | 1.5 kW | 3.05 N·m | 100 mm / 50.8 mm | Approx. 42.8 × 21.7 × 26.0 cm | Approx. 6–7 kg |
The RJ74AA and RJ72AA versions are especially close mechanically. The main distinction is the brake configuration. The RJ74AA includes a 24 V DC brake, while the RJ72AA is the non-brake configuration.
The MJ74AA configuration keeps the same basic B320P frame and stack arrangement but changes the feedback system to a multi-turn high-resolution absolute encoder.
The dimensions and weights in this comparison should be regarded as approximate configuration/family references. Exact shipping or installed weight can vary with feedback, brake, connector, and mechanical configuration.
18. Comparison of Closely Related B320P Configurations
| Model | Model | Feedback | Shaft | Brake | Typical Selection Purpose | Approx. Dimensions | Weight |
|---|---|---|---|---|---|---|---|
| MPL-B320P-RJ72AA | MPL-B320P-RJ72AA | Resolver | Keyed | No | Basic resolver servo configuration | Approx. 42.8 × 21.7 × 26.0 cm | Approx. 3.85 kg |
| MPL-B320P-RJ74AA | MPL-B320P-RJ74AA | Resolver | Keyed | 24 V DC | Resolver + holding brake | Approx. 42.8 × 21.7 × 26.0 cm | Approx. 6.8 kg |
| MPL-B320P-RK72AA | MPL-B320P-RK72AA | Resolver | Keyless | No | Keyless mechanical arrangement | Approx. 42.8 × 21.7 × 26.0 cm | Approx. 3.7–3.9 kg |
| MPL-B320P-RK74AA | MPL-B320P-RK74AA | Resolver | Keyless | 24 V DC | Keyless arrangement with brake | Approx. 42.8 × 21.7 × 26.0 cm | Approx. 6–7 kg |
| MPL-B320P-MJ74AA | MPL-B320P-MJ74AA | Multi-turn absolute | Keyed | 24 V DC | Absolute feedback + brake | Approx. 42.8 × 21.7 × 26.0 cm | Approx. 6–7 kg |
19. Five Common Allen-Bradley Models for Comparison
The following models are useful comparison points within the same general servo-motor family.
| Model | Motor Family | Rated Speed | Rated Power | Continuous Torque | Feedback | Shaft | Brake | Frame / Stack | Approx. Dimensions | Weight |
|---|---|---|---|---|---|---|---|---|---|---|
| MPL-B310P-MJ74AA | MPL B-Series | 5000 RPM | 0.77 kW | 1.58 N·m | Absolute | Keyed | 24 V DC | 100 mm class / shorter stack | Approx. 42.8 × 21.7 × 26.0 cm | Approx. 2.7 kg |
| MPL-B320P-MK74AA | MPL B-Series | 5000 RPM | 1.5 kW | 3.05 N·m | Multi-turn absolute | Keyless | 24 V DC | 100 mm / 50.8 mm | Approx. 42.8 × 21.7 × 26.0 cm | Approx. 6–7 kg |
| MPL-B330P-MK74AA | MPL B-Series | 5000 RPM | 1.8 kW | 4.18 N·m | Multi-turn absolute | Keyless | 24 V DC | 100 mm / 76.2 mm | Approx. 42.8 × 21.7 × 26.0 cm family envelope | Approx. 4.6–6 kg |
| MPL-B420P-RJ74AA | MPL B-Series | 5000 RPM | Approx. 1.9 kW | Approx. 4.74 N·m | Resolver | Keyed | 24 V DC | 115 mm / 50.8 mm | Approx. 46 × 23 × 28 cm | Approx. 7 kg |
| MPL-B430P-MJ72AA | MPL B-Series | 5000 RPM | Approx. 2.2 kW | Approx. 6.55 N·m | Multi-turn absolute | Keyed | No brake | 115 mm class / longer stack | Approx. 46 × 23 × 28 cm | Approx. 7 kg |
The B310P, B320P, and B330P models represent different motor sizes within the same general 5000 RPM B-series range. As the model size increases, the available torque and power also increase.
The B420P moves into a larger frame class, providing a higher torque capability than the B320P. The B-series therefore gives machine designers several options when the application requires a different combination of torque, power, inertia, and physical size.
Some dimensions and weights in the comparison table are engineering-level approximate values and should be checked against the exact catalog configuration before mechanical design or replacement.
20. B-Series Performance Comparison
| Model | Model | Rated Speed | Rated Power | Continuous Stall Torque | Peak Torque | Rotor Inertia | Approx. Dimensions | Weight |
|---|---|---|---|---|---|---|---|---|
| MPL-B310P | MPL-B310P | 5000 RPM | 0.77 kW | 1.58 N·m | 3.61 N·m | 0.000044 kg·m² | Approx. B310 family envelope | Approx. 2.7 kg |
| MPL-B320P | MPL-B320P | 5000 RPM | 1.5 kW | 3.05 N·m | 7.91 N·m | 0.000078 kg·m² | Approx. B320 family envelope | Approx. 3.7 kg base motor |
| MPL-B330P | MPL-B330P | 5000 RPM | 1.8 kW | 4.18 N·m | 11.1 N·m | 0.00012 kg·m² | Approx. B330 family envelope | Approx. 4.6 kg |
| MPL-B420P | MPL-B420P | 5000 RPM | Approx. 1.9 kW | Approx. 4.74 N·m | Approx. 13.5 N·m | Approx. 0.00026 kg·m² | Approx. 46 × 23 × 28 cm | Approx. 7 kg |
| MPL-B430P | MPL-B430P | 5000 RPM | Approx. 2.2 kW | Approx. 6.55 N·m | Approx. 19.8 N·m | Approx. 0.00038 kg·m² | Approx. 46 × 23 × 28 cm | Approx. 7 kg |
The B320P occupies a useful position in this range, offering substantially more torque and power than the smaller B310P while remaining below the larger B330P and B420P configurations.
The published B320P family data specifies 1.5 kW output, 3.05 N·m continuous stall torque, 7.91 N·m peak torque, and approximately 0.000078 kg·m² rotor inertia.
21. MPL-B320P-RJ74AA Versus MPL-B320P-RJ72AA
| Feature | MPL-B320P-RJ74AA | MPL-B320P-RJ72AA |
|---|---|---|
| Feedback | Resolver | Resolver |
| Frame | 100 mm | 100 mm |
| Stack | 50.8 mm | 50.8 mm |
| Speed | 5000 RPM | 5000 RPM |
| Power | 1.5 kW | 1.5 kW |
| Continuous Torque | 3.05 N·m | 3.05 N·m |
| Shaft | Keyed | Keyed |
| Connector | SpeedTEC DIN right-angle | SpeedTEC DIN right-angle |
| Brake | 24 V DC | No brake |
| Approx. Dimensions | 42.8 × 21.7 × 26.0 cm | 42.8 × 21.7 × 26.0 cm |
| Weight | Approx. 6.8 kg | Approx. 3.85 kg |
The two configurations are mechanically and electrically close, but the brake option changes the installation requirements and overall weight.
For a machine that requires a holding brake, the RJ74AA configuration provides the corresponding motor option.
For a machine that does not require an integral brake, the RJ72AA configuration may be considered as the non-brake counterpart.
22. MPL-B320P-RJ74AA Versus MPL-B320P-MJ74AA
| Feature | MPL-B320P-RJ74AA | MPL-B320P-MJ74AA |
|---|---|---|
| Feedback | Resolver | Multi-turn absolute encoder |
| Frame | 100 mm | 100 mm |
| Stack | 50.8 mm | 50.8 mm |
| Speed | 5000 RPM | 5000 RPM |
| Power | 1.5 kW | 1.5 kW |
| Continuous Torque | 3.05 N·m | 3.05 N·m |
| Shaft | Keyed | Keyed |
| Brake | 24 V DC | 24 V DC |
| Connector | SpeedTEC DIN | SpeedTEC DIN |
| Feedback Type | Resolver | Multi-turn high-resolution absolute |
| Approx. Dimensions | 42.8 × 21.7 × 26.0 cm | 42.8 × 21.7 × 26.0 cm |
| Weight | Approx. 6.8 kg | Approx. 6–7 kg |
The main difference is the feedback technology.
The RJ74AA uses resolver feedback, while the MJ74AA uses a multi-turn high-resolution absolute encoder. The correct choice depends on the motion-control architecture, feedback requirements, drive compatibility, and machine design.
23. Practical Application Selection
The MPL-B320P-RJ74AA can be considered when the application has several of the following requirements:
- 5000 RPM operating speed
- Approximately 1.5 kW motor power
- Approximately 3.05 N·m continuous stall torque
- Short acceleration and deceleration cycles
- Servo-controlled positioning
- Resolver feedback
- Keyed mechanical shaft connection
- Integrated 24 V DC holding brake
- 100 mm metric motor frame
- Compact industrial machine installation
- High repeatability
- Coordinated motion
- Frequent indexing
- Controlled rotary movement
24. Advantages for Machine Builders
For machine builders, the MPL-B320P-RJ74AA provides several useful configuration features in one motor.
The 100 mm frame size provides a relatively compact mechanical package for a 1.5 kW servo motor.
The 5000 RPM rating supports high-speed machine axes.
The resolver feedback system provides closed-loop feedback without requiring an external position sensor mounted elsewhere on the machine.
The integrated brake reduces the need to add a separate mechanical holding mechanism in applications where a motor-mounted holding brake is appropriate.
The keyed shaft provides a conventional mechanical interface that can simplify integration with existing machine components.
The rotatable right-angle connector can make cable routing easier in crowded machine layouts.
25. Advantages for Replacement and Retrofit Projects
The MPL-B320P-RJ74AA can also be relevant when maintaining or upgrading existing equipment that already uses an MPL B320P servo configuration.
When replacing a motor, the following parameters should be checked carefully:
| Replacement Check | MPL-B320P-RJ74AA |
|---|---|
| Model | MPL-B320P-RJ74AA |
| Frame | 100 mm |
| Stack | 50.8 mm |
| Voltage Class | 400 V AC |
| Armature Voltage | 460 V |
| Rated Speed | 5000 RPM |
| Rated Power | 1.5 kW |
| Continuous Torque | 3.05 N·m |
| Peak Torque | 7.91 N·m |
| Feedback | Resolver |
| Shaft | Keyed |
| Brake | 24 V DC |
| Connector | SpeedTEC DIN, right-angle |
| Approx. Dimensions | 42.8 × 21.7 × 26.0 cm family reference |
| Weight | Approx. 6.8 kg |
A replacement should not be selected solely because the frame size is the same.
Feedback type, brake option, shaft configuration, connector type, electrical class, motor inertia, drive compatibility, and application load should all be checked.
26. Product Advantages at a Glance
| Advantage | Description |
|---|---|
| Model | MPL-B320P-RJ74AA |
| High Speed | 5000 RPM rated speed |
| Motor Power | 1.5 kW |
| Torque | 3.05 N·m continuous, 7.91 N·m peak |
| Low Inertia | Approx. 0.000078 kg·m² rotor inertia |
| Feedback | Resolver |
| Brake | 24 V DC holding brake |
| Mechanical Shaft | Keyed |
| Connector | Right-angle SpeedTEC DIN |
| Connector Flexibility | 180° rotatable |
| Frame | 100 mm |
| Stack | 50.8 mm |
| Mounting | IEC metric |
| Application Range | Packaging, handling, assembly, indexing, machine automation and other servo applications |
| Approx. Dimensions | 42.8 × 21.7 × 26.0 cm family reference |
| Weight | Approx. 6.8 kg |
27. Recommended Related Model List
| No. | Related Model | Main Difference | Speed | Power | Torque | Feedback | Brake | Dimensions | Weight |
|---|---|---|---|---|---|---|---|---|---|
| 1 | MPL-B320P-RJ72AA | Same resolver/keyed configuration without brake | 5000 RPM | 1.5 kW | 3.05 N·m | Resolver | No | Approx. 42.8 × 21.7 × 26.0 cm | Approx. 3.85 kg |
| 2 | MPL-B320P-RK74AA | Keyless shaft with brake | 5000 RPM | 1.5 kW | 3.05 N·m | Resolver | 24 V DC | Approx. 42.8 × 21.7 × 26.0 cm | Approx. 6–7 kg |
| 3 | MPL-B320P-RK72AA | Keyless shaft without brake | 5000 RPM | 1.5 kW | 3.05 N·m | Resolver | No | Approx. 42.8 × 21.7 × 26.0 cm | Approx. 3.7–3.9 kg |
| 4 | MPL-B320P-MJ74AA | Multi-turn absolute feedback | 5000 RPM | 1.5 kW | 3.05 N·m | Absolute encoder | 24 V DC | Approx. 42.8 × 21.7 × 26.0 cm | Approx. 6–7 kg |
| 5 | MPL-B320P-SJ74AA | Single-turn high-resolution feedback | 5000 RPM | 1.5 kW | 3.05 N·m | Single-turn encoder | 24 V DC | Approx. 42.8 × 21.7 × 26.0 cm | Approx. 6–7 kg |
The B320P family provides several combinations of feedback, shaft, and brake configuration. The core motor size and performance remain closely related, while the configuration suffix determines the main functional differences.
28. Final Detailed Specification
| Specification | MPL-B320P-RJ74AA |
|---|---|
| Brand | Allen-Bradley |
| Series | MP-Series MPL |
| Series Type | Low-Inertia Brushless Servo Motor |
| Product Type | AC Rotary Servo Motor |
| Voltage Class | 400 V AC |
| Armature Voltage | 460 V |
| Product Rating | 480 V AC |
| Rated Power | 1.5 kW |
| Rated Speed | 5000 RPM |
| Maximum Speed | 5000 RPM |
| Continuous Stall Torque | 3.05 N·m |
| Peak Stall Torque | 7.91 N·m |
| Rotor Inertia | Approx. 0.000078 kg·m² |
| Frame Size | 100 mm |
| Frame Class | Frame 3 |
| Magnetic Stack Length | 50.8 mm |
| Feedback | Resolver |
| Resolver | 2-pole resolver |
| Shaft | Keyed shaft extension |
| Shaft Seal | No shaft seal |
| Brake | 24 V DC holding brake |
| Connector | SpeedTEC DIN |
| Connector Type | Right-angle |
| Connector Rotation | 180° |
| Mounting | IEC metric flange |
| Mounting Holes | Free mounting holes, Type FF |
| Duty | S1 |
| Phase | 3-phase |
| Operating Temperature Reference | Up to approximately 40 °C |
| Approx. Dimensions | 42.8 × 21.7 × 26.0 cm, B320P family reference |
| Weight | Approx. 6.8 kg |
| Typical Application | Industrial servo motion control |
| Suitable Functions | Positioning, indexing, speed control, torque control, synchronized motion |
| Brake Supply | 24 V DC |
| Motor Construction | Brushless permanent-magnet servo motor |
29. Overall Product Summary
The Allen-Bradley MPL-B320P-RJ74AA is a 1.5 kW, 5000 RPM low-inertia AC rotary servo motor designed for industrial motion-control applications.
Its 100 mm frame, 50.8 mm magnetic stack, resolver feedback, keyed shaft, SpeedTEC DIN connector, and integrated 24 V DC holding brake make it a well-defined configuration within the MPL B320P servo motor family.
The motor’s 3.05 N·m continuous stall torque and 7.91 N·m peak torque provide a useful combination of continuous and short-duration torque capability for automated machinery.
The low-inertia rotor design supports fast changes in speed and direction, which is particularly useful for indexing, positioning, packaging, material handling, assembly, and other repetitive motion applications.
The resolver feedback system allows the motor to operate as part of a closed-loop servo system, providing the feedback required for controlled motion.
The 24 V DC brake distinguishes the RJ74AA configuration from the corresponding non-brake RJ72AA configuration and can be particularly useful for vertical or load-holding applications.
The keyed shaft provides a conventional mechanical interface, while the right-angle, 180° rotatable SpeedTEC DIN connector gives additional flexibility when designing cable routing and machine layouts.
For replacement applications, the most important points to verify are the frame size, magnetic stack length, voltage class, power rating, feedback type, shaft configuration, brake configuration, connector arrangement, mechanical dimensions, and actual machine load.
In practical terms, the MPL-B320P-RJ74AA is a compact, high-speed industrial servo motor configuration intended for applications that require controlled rotary motion, closed-loop feedback, rapid response, and an integrated holding brake.
The model is particularly relevant to automated production machinery where repeatable positioning and controlled motion are more important than simple constant-speed motor operation.
Brand: Allen-Bradley
Series: MP-Series MPL Low-Inertia Servo Motors
Model: MPL-B320P-RJ74AA
Motor Rating: 1.5 kW
Rated Speed: 5000 RPM
Continuous Torque: 3.05 N·m
Peak Torque: 7.91 N·m
Feedback: Resolver
Shaft: Keyed
Brake: 24 V DC Holding Brake
Frame: 100 mm
Magnetic Stack: 50.8 mm
Approximate Weight: 6.8 kg
Approximate B320P Family Envelope: 42.8 × 21.7 × 26.0 cm
This combination makes the MPL-B320P-RJ74AA a suitable configuration for a broad range of industrial servo applications where speed, controlled torque, feedback, mechanical integration, and shaft holding capability all need to be considered together.