Introduction
The Allen-Bradley MPL-B320P-RJ72AA is an MP-Series MPL low-inertia brushless rotary servo motor designed for industrial automation systems requiring accurate motor feedback and responsive motion control.
This model uses a 460 V armature voltage, a 100 mm Frame 3 housing, and a 50.8 mm magnet stack. With a rated speed of 5000 RPM, it provides a balance between high-speed operation and the torque capability required by a wide range of industrial machine axes.
The MPL-B320P-RJ72AA is equipped with a 2-pole resolver rather than an absolute encoder. Resolver feedback provides rotor-position information to the servo drive and is well suited to industrial environments where robust feedback operation is important. When replacing another servo motor, the feedback type must be checked carefully because resolver-based and encoder-based configurations are not interchangeable simply because their mechanical dimensions are similar.
The motor's low-inertia construction helps provide responsive dynamic performance. This is useful for machinery that repeatedly changes speed or position, including indexing machines, packaging equipment, automated assembly systems, and material-handling equipment.
A keyed shaft extension is provided for mechanical power transmission. The keyway allows compatible couplings, pulleys, gears, or other machine components to be secured to the motor shaft according to the mechanical design of the equipment.
The MPL-B320P-RJ72AA is configured with no integrated brake. This configuration is appropriate when the application does not require a motor holding brake. For vertical axes or other applications where mechanical holding is necessary when the servo is disabled, a brake-equipped model should be selected instead.
The motor uses a SpeedTEC DIN right-angle connector that can be rotated through 180 degrees. This helps accommodate different machine layouts and can make motor-cable routing easier in compact installations.
The 100 mm Frame 3 construction and 50.8 mm stack length provide a larger motor configuration than many smaller MPL models. The model is therefore appropriate for machine axes requiring greater torque capacity while still maintaining the low-inertia characteristics of the MPL product family.
For installation or replacement, engineers should verify the motor's voltage class, feedback technology, speed rating, torque requirements, shaft configuration, brake option, connector arrangement, mounting dimensions, and compatible servo-drive requirements before commissioning.
Technical Specifications
| Parameter | Specification |
|---|---|
| Brand | Allen-Bradley |
| Manufacturer | Rockwell Automation |
| Model | MPL-B320P-RJ72AA |
| Product Family | MP-Series MPL |
| Product Type | 480V AC Rotary Servo Motor |
| Motor Design | Low-Inertia Brushless Servo Motor |
| Voltage Class | 460 V AC |
| Frame Size | 100 mm |
| Frame Designation | Frame 3 |
| Magnet Stack Length | 50.8 mm (2.0 in.) |
| Stack Designation | Stack Length 20 |
| Rated Speed | 5000 RPM |
| Continuous Torque | 3.05 Nm |
| Feedback Type | 2-Pole Resolver |
| Shaft Type | Keyed Shaft Extension |
| Connector | SpeedTEC DIN Right-Angle Connector |
| Connector Rotation | 180° Rotatable |
| Brake | No Brake |
| Mounting | IEC Metric, Free Mounting Holes Type FF |
| Enclosure | IP50 standard; higher shaft-area protection can be available with the appropriate shaft-seal configuration |
| Dimensions | Not specified in the supplied data |
| Weight | 3.70 kg (8.16 lb) |
| Application | Industrial Servo Motion Control |
Recommended Related Models
- Allen-Bradley MPL-B320P-RJ74AA — 100 mm Frame 3 MPL servo motor with resolver feedback and 24 V DC brake.
- Allen-Bradley MPL-B320P-MK72AA — 100 mm Frame 3 MPL servo motor with multi-turn high-resolution absolute feedback and no brake.
- Allen-Bradley MPL-B320P-MK74AA — 100 mm Frame 3 MPL servo motor with multi-turn high-resolution absolute feedback and 24 V DC brake.
- Allen-Bradley MPL-B320P-MJ72AA — Related Frame 3 MPL servo motor configuration with absolute feedback and no brake.
- Allen-Bradley MPL-B320P-MJ74AA — Related Frame 3 MPL servo motor configuration with absolute feedback and brake.
Popular Related Models
- Allen-Bradley MPL-B310P-RJ72AA — MP-Series MPL 460 V-class servo motor in the Frame 3 family with resolver feedback and no brake.
- Allen-Bradley MPL-B310P-RJ74AA — Related resolver-feedback configuration with 24 V DC brake.
- Allen-Bradley MPL-B320P-RJ74AA — Resolver-feedback version of the same 100 mm Frame 3 motor with integrated brake.
- Allen-Bradley MPL-B320P-MK72AA — Multi-turn absolute-feedback configuration without brake.
- Allen-Bradley MPL-B320P-MK74AA — Multi-turn absolute-feedback configuration with 24 V DC brake.
- Allen-Bradley MPL-B330P-RJ72AA — Related 100 mm Frame 3 MPL servo motor configuration for applications requiring a different stack length and resolver feedback.
