Introduction
The Allen-Bradley MPL-B320P-MK74AA is a high-performance MP-Series MPL rotary servo motor designed for industrial automation systems that require precise motion control, high-speed operation, and substantial torque output.
The motor belongs to the 460 V class and uses a 100 mm Frame 3 housing. Its 50.8 mm magnet stack provides a larger electromagnetic configuration than compact MPL motors, making this model suitable for machine axes requiring greater continuous and peak torque capability.
With a rated speed of 5000 RPM, the MPL-B320P-MK74AA is designed for applications involving rapid positioning, synchronized movement, indexing, and repeated acceleration and deceleration. Its low-inertia brushless construction helps the motor respond quickly to commands from the associated servo drive.
The motor provides approximately 3.05 Nm of continuous torque and 7.91 Nm of peak torque. The combination allows the servo system to handle normal operating loads while providing additional short-term torque during acceleration or other demanding motion events.
A key feature of this model is its multi-turn high-resolution absolute encoder. Absolute multi-turn feedback provides detailed position information across multiple motor revolutions. This makes the motor suitable for precision applications where the control system needs accurate feedback about the axis position.
The MPL-B320P-MK74AA also incorporates a 24 V DC holding brake. The brake can be used to help hold the shaft when the motor is not generating servo torque. This is particularly useful for vertical or mechanically loaded axes where uncontrolled movement during a servo shutdown could be undesirable.
Unlike keyed-shaft MPL configurations, this model uses a keyless shaft extension. Mechanical transmission components therefore need to be selected and installed according to the appropriate shaft and coupling requirements.
The motor uses a SpeedTEC DIN right-angle connector that can be rotated through 180 degrees. This provides installation flexibility and can simplify motor-cable routing in compact machine layouts.
For replacement or retrofit applications, engineers should verify the complete catalog number before selecting the motor. The voltage class, frame size, stack length, feedback type, shaft configuration, brake option, connector configuration, and servo-drive compatibility should all match the application requirements.
Technical Specifications
| Parameter | Specification |
|---|---|
| Brand | Allen-Bradley |
| Manufacturer | Rockwell Automation |
| Model | MPL-B320P-MK74AA |
| 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 |
| Maximum Speed | 5000 RPM |
| Continuous Torque | 3.05 Nm |
| Peak Torque | 7.91 Nm |
| Rated Continuous Output | 1.5 kW |
| Feedback Type | Multi-turn High-resolution Absolute Encoder |
| Feedback Resolution | Sin/Cos, 1024 cycles/rev |
| Feedback Protocol | Hiperface |
| Shaft Type | Keyless Shaft Extension |
| Connector | SpeedTEC DIN Right-Angle Connector |
| Connector Rotation | 180° Rotatable |
| Brake | 24 V DC Brake |
| Mounting | IEC Metric, Free Mounting Holes Type FF |
| Enclosure | IP50; IP66 with appropriate optional shaft-seal configuration |
| Rotor Inertia | Approximately 9.2 × 10⁻⁵ kg·m² |
| Maximum Operating Temperature | 40°C |
| 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-MK72AA — 100 mm Frame 3 MPL servo motor with multi-turn high-resolution absolute feedback and no brake.
- Allen-Bradley MPL-B320P-RK74AA — 100 mm Frame 3 MPL servo motor with an alternative feedback configuration and 24 V DC brake.
- Allen-Bradley MPL-B320P-RK72AA — 100 mm Frame 3 MPL servo motor with an alternative feedback configuration and no brake.
- Allen-Bradley MPL-B320P-SJ74AA — 100 mm Frame 3 MPL servo motor with another feedback configuration and 24 V DC brake.
- Allen-Bradley MPL-B320P-SJ72AA — 100 mm Frame 3 MPL servo motor with the corresponding no-brake configuration.
Popular Related Models
- Allen-Bradley MPL-B310P-MK74AA — MP-Series MPL 460 V-class servo motor with a 100 mm frame and multi-turn absolute feedback.
- Allen-Bradley MPL-B330P-MK74AA — MP-Series MPL 460 V-class servo motor with a longer magnet-stack configuration and multi-turn absolute feedback.
- Allen-Bradley MPL-B410P-MK74AA — Larger-frame MP-Series MPL servo motor for applications requiring greater torque capacity.
- Allen-Bradley MPL-B4540C-SJ74AA — MP-Series MPL 480 V AC servo motor for higher-power industrial motion applications.
- Allen-Bradley MPL-B320P-MK72AA — Closely related 100 mm Frame 3 configuration without the 24 V DC brake.
