Introduction
The Allen-Bradley MPL-B320P-SK72AA Servo Motor is part of the MP-Series MPL family of low-inertia brushless servo motors. It is designed for industrial motion systems where high-speed operation, precise feedback, and rapid dynamic response are required.
The motor combines a 100 mm Frame 3 with a 50.8 mm magnet stack and a 5000 RPM rated speed. Its low-inertia design makes it suitable for applications involving frequent acceleration, deceleration, indexing, and position changes.
A key characteristic of the SK72AA is its single-turn high-resolution encoder feedback. The encoder provides 1024 Sin/Cos cycles per revolution and uses Hiperface protocol. This feedback allows a compatible servo drive to continuously monitor motor position and provide accurate closed-loop control.
The keyless shaft extension distinguishes this model from keyed-shaft variants within the MPL-B320P family. When installing the motor, the coupling and driven equipment should be selected specifically for a keyless shaft interface. Proper shaft alignment is also important to minimize radial and axial loads on the motor bearings.
Unlike the related MPL-B320P-SK74AA, the SK72AA does not include an integrated 24 V DC brake. This makes the SK72AA a straightforward choice for applications where the machine does not require motor-based holding when servo power is removed.
The motor uses a SpeedTEC DIN right-angle connector with 180° rotation capability. This provides flexibility when routing power and feedback cables around the machine and can be especially useful where installation space is restricted.
The MPL-B320P-SK72AA has approximately 3.05 Nm continuous torque, 7.91 Nm peak torque, and approximately 1.5 kW continuous rated output. It can therefore serve as a compact high-speed servo motor for a range of industrial automation and motion-control applications.
When replacing an existing MPL motor, the complete catalog number should be checked carefully. Frame size alone does not determine compatibility; feedback type, shaft design, brake configuration, voltage class, connector arrangement, and servo-drive compatibility must also be matched.
Technical Specifications
| Parameter | Specification |
|---|---|
| Brand | Allen-Bradley |
| Manufacturer | Rockwell Automation |
| Product Family | MP-Series MPL |
| Product Type | Rotary Servo Motor |
| Model | MPL-B320P-SK72AA |
| Motor Type | Low-Inertia Brushless Servo Motor |
| Voltage Class | 480 VAC |
| Armature Voltage | 460 V |
| Frame Size | 100 mm / Frame 3 |
| Magnet Stack Length | 50.8 mm (2.0 in.) |
| Rated Speed | 5000 RPM |
| Maximum Speed | 5000 RPM |
| Continuous Torque | Approx. 3.05 Nm |
| Peak Torque | Approx. 7.91 Nm |
| Continuous Rated Output | Approx. 1.5 kW |
| Feedback | Single-Turn High-Resolution Encoder |
| Feedback Resolution | Sin/Cos, 1024 cycles/rev |
| Feedback Protocol | Hiperface |
| Shaft Configuration | Keyless Shaft Extension |
| Shaft Seal | No Shaft Seal |
| Brake | No Brake |
| Connector | SpeedTEC DIN Right-Angle Connector |
| Connector Rotation | 180° Rotatable |
| Mounting | IEC Metric |
| Mounting Holes | Free Mounting Holes, Type FF |
| Rotor Inertia | Approx. 7.8 × 10⁻⁵ kg·m² |
| Maximum Operating Temperature | 40°C |
| Enclosure | IP50 standard; IP66 possible with appropriate shaft-seal configuration |
| Dimensions | Not specified in the supplied product data |
| Weight | 3.70 kg (8.16 lb) |
| Lifecycle | Active |
Recommended Related Models
The following MPL-B320P models are useful when comparing different feedback, shaft, and brake configurations:
- MPL-B320P-SK74AA – Single-turn high-resolution encoder, keyless shaft, 24 V DC brake
- MPL-B320P-SJ72AA – Single-turn high-resolution encoder, keyed shaft, no brake
- MPL-B320P-SJ74AA – Single-turn high-resolution encoder, keyed shaft, 24 V DC brake
- MPL-B320P-RK72AA – Resolver feedback, keyless shaft, no brake
- MPL-B320P-RK74AA – Resolver feedback, keyless shaft, 24 V DC brake
- MPL-B320P-RJ72AA – Resolver feedback, keyed shaft, no brake
- MPL-B320P-RJ74AA – Resolver feedback, keyed shaft, 24 V DC brake
- MPL-B320P-MK72AA – Multi-turn high-resolution feedback, keyless shaft, no brake
- MPL-B320P-MK74AA – Multi-turn high-resolution feedback, keyless shaft, 24 V DC brake
The closest comparison is the MPL-B320P-SK74AA, which retains the same keyless-shaft and single-turn encoder configuration but adds a 24 V DC brake.
Popular Related Models
For Allen-Bradley MP-Series MPL servo applications, the following models are commonly compared with the MPL-B320P-SK72AA:
- Allen-Bradley MPL-B320P-SK74AA – Single-turn encoder, keyless shaft, 24 V DC brake
- Allen-Bradley MPL-B320P-SJ72AA – Single-turn encoder, keyed shaft, no brake
- Allen-Bradley MPL-B320P-SJ74AA – Single-turn encoder, keyed shaft, 24 V DC brake
- Allen-Bradley MPL-B320P-RK72AA – Resolver, keyless shaft, no brake
- Allen-Bradley MPL-B320P-RK74AA – Resolver, keyless shaft, 24 V DC brake
- Allen-Bradley MPL-B320P-RJ72AA – Resolver, keyed shaft, no brake
- Allen-Bradley MPL-B320P-RJ74AA – Resolver, keyed shaft, 24 V DC brake
- Allen-Bradley MPL-B320P-MK72AA – Multi-turn high-resolution feedback, keyless shaft, no brake
For replacement or retrofit projects, verify the 100 mm frame, 50.8 mm magnet stack, 5000 RPM speed, single-turn encoder feedback, keyless shaft, no-brake configuration, and connector arrangement before selecting an alternative. These parameters determine actual mechanical and electrical compatibility.
