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Allen-Bradley MPL-B320P-RK72AA Servo Motor – Detailed Product Information
1. Product Introduction
The Allen-Bradley MPL-B320P-RK72AA is a low-inertia AC rotary servo motor designed for industrial motion-control applications requiring controlled speed, repeatable positioning, rapid acceleration and deceleration, and closed-loop feedback.
It belongs to the MP-Series MPL low-inertia brushless servo motor family and uses a 460 V-class electrical configuration, a 100 mm frame size, a 50.8 mm magnetic stack, and a rated speed of 5000 RPM.
The motor is equipped with resolver feedback, a keyless shaft extension, a right-angle SpeedTEC DIN connector, and no integral brake. The connector can be rotated through 180 degrees, providing additional flexibility when the motor is installed in a compact machine structure.
The B320P motor size provides approximately 1.5 kW of continuous rated output, 3.05 N·m of continuous stall torque, and 7.91 N·m of peak stall torque. This combination makes it suitable for a wide range of industrial servo axes where high-speed operation and controlled motion are required.
The RK72AA configuration is particularly recognizable by its keyless shaft and no-brake arrangement. Compared with keyed versions of the same B320P motor, the keyless shaft can be useful when the mechanical transmission is designed around a clamp-style coupling or another shaft connection that does not require a conventional key.
The motor is intended to work as part of a complete servo system consisting of a compatible servo drive, controller, feedback circuit, motor cable, mechanical transmission, and machine load.
2. Basic Product Parameters
| Parameter | Specification |
|---|---|
| Model | MPL-B320P-RK72AA |
| Brand | Allen-Bradley |
| Product Type | AC Rotary Servo Motor |
| Product Family | MP-Series MPL |
| Series | MPL Low-Inertia Servo Motors |
| Motor Type | 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 |
| Feedback Type | 2-pole resolver |
| Shaft | Keyless shaft extension |
| Shaft Seal | No shaft seal |
| Brake | No integral brake |
| Connector | SpeedTEC DIN |
| Connector Position | Right-angle |
| Connector Rotation | 180° rotatable |
| Mounting | IEC metric flange |
| Mounting Holes | Free mounting holes, Type FF |
| Frame Size | 100 mm |
| Frame Class | Frame 3 |
| Magnetic Stack Length | 50.8 mm |
| Phases | 3-phase |
| 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 |
| Approx. Weight | Approx. 3.7–3.9 kg |
| Application | Industrial servo motion control |
| Lifecycle Status | Active Mature |
The main configuration is a 460 V-class, 100 mm-frame, 50.8 mm-stack servo motor with 5000 RPM operating capability. The B320P motor family is rated at 1.5 kW with approximately 3.05 N·m continuous stall torque and 7.91 N·m peak stall torque.
The RK72AA configuration specifically uses a keyless shaft and no integral brake, which distinguishes it from the keyed and/or brake-equipped variants within the same motor family.
3. Brand and Product Series
Brand
Brand: Allen-Bradley
Allen-Bradley servo motors are widely used in industrial automation systems where controlled motion, positioning, speed regulation, and repeatable machine operation are required.
Product Series
Series: MP-Series MPL
The MPL series is a low-inertia brushless servo motor family intended for industrial motion-control applications.
The B320P represents a 100 mm frame-class motor with a 50.8 mm magnetic stack and 5000 RPM speed rating.
Within the B-series family, different motor sizes provide different combinations of power, torque, rotor inertia, and physical dimensions.
4. Model Number Explanation
The model number MPL-B320P-RK72AA contains several configuration identifiers.
| Model Code | 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 |
| P | 5000 RPM speed class |
| R | Resolver feedback |
| K | Keyless shaft extension |
| 7 | SpeedTEC DIN right-angle connector, 180° rotatable |
| 2 | No integral brake |
| AA | Standard catalog configuration |
The model code is particularly useful when comparing related motor configurations.
For example, the MPL-B320P-RJ72AA has a keyed shaft instead of the keyless shaft used by the RK72AA. The MPL-B320P-RK74AA retains the keyless shaft but adds a 24 V DC holding brake.
5. Motor Performance Specifications
| Performance Parameter | MPL-B320P-RK72AA |
|---|---|
| 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 |
| Approx. Weight | 3.7–3.9 kg |
The 1.5 kW rating places the B320P in a useful middle range of the MPL B-series motor family.
The motor can deliver approximately 3.05 N·m of continuous stall torque and approximately 7.91 N·m of peak stall torque.
The difference between continuous and peak torque is important in servo applications. Continuous torque relates to the motor’s ability to maintain torque over sustained operation, while peak torque is relevant to short-duration acceleration, deceleration, or temporary load requirements.
6. Electrical Specifications
| Electrical Parameter | Specification |
|---|---|
| Model | MPL-B320P-RK72AA |
| Motor Type | Brushless AC Servo Motor |
| Voltage Class | 400 V AC |
| Armature Voltage | 460 V |
| Product Voltage Rating | 480 V AC |
| Rated Power | 1.5 kW |
| Phase | 3-phase |
| Rated Speed | 5000 RPM |
| Maximum Speed | 5000 RPM |
| Feedback | Resolver |
| Feedback Type | 2-pole resolver |
| Brake | None |
| Duty | S1 |
| Rotor Inertia | Approx. 0.000078 kg·m² |
| Approx. Dimensions | 42.8 × 21.7 × 26.0 cm family reference |
| Approx. Weight | 3.7–3.9 kg |
The motor is intended to be operated through a compatible servo drive rather than connected directly to a conventional motor starter.
The drive controls the motor’s electrical current and provides the closed-loop motion-control functions required for speed and position regulation.
Because the RK72AA does not include an integral brake, applications requiring mechanical holding capability should address that requirement through the overall machine design.
7. Mechanical Specifications
| Mechanical Parameter | Specification |
|---|---|
| Model | MPL-B320P-RK72AA |
| Frame Size | 100 mm |
| Frame Class | 3 |
| Magnetic Stack Length | 50.8 mm |
| Shaft Type | Keyless shaft extension |
| Shaft Seal | No shaft seal |
| Mounting Flange | IEC metric |
| Mounting Hole Style | Free mounting holes, Type FF |
| Connector | SpeedTEC DIN |
| Connector Orientation | Right-angle |
| Connector Rotation | 180° |
| Integral Brake | No |
| Approx. Dimensions | 42.8 × 21.7 × 26.0 cm, B320P family reference |
| Approx. Weight | 3.7–3.9 kg |
The keyless shaft is one of the most important mechanical characteristics of this model.
Instead of relying on a traditional shaft key for torque transmission, the shaft is intended for mechanical connections that can be secured through a suitable clamping or coupling arrangement.
This can simplify certain machine designs because the coupling does not have to rely on a conventional keyway arrangement.
The exact coupling method must always be selected according to the motor shaft dimensions, load torque, acceleration requirements, coupling manufacturer specifications, and machine safety requirements.
8. Keyless Shaft Design
The keyless shaft configuration makes the RK72AA different from the RJ72AA.
| Feature | MPL-B320P-RK72AA | MPL-B320P-RJ72AA |
|---|---|---|
| Feedback | Resolver | Resolver |
| Shaft | Keyless | Keyed |
| Brake | No brake | No brake |
| Speed | 5000 RPM | 5000 RPM |
| Power | 1.5 kW | 1.5 kW |
| Continuous Torque | 3.05 N·m | 3.05 N·m |
| Frame | 100 mm | 100 mm |
| Stack | 50.8 mm | 50.8 mm |
| Approx. Dimensions | 42.8 × 21.7 × 26.0 cm | 42.8 × 21.7 × 26.0 cm |
| Approx. Weight | 3.7–3.9 kg | Approx. 3.85 kg |
The keyless version is useful when the machine’s mechanical transmission is already designed around a clamping coupling or similar connection method.
The keyed version can be more convenient when existing machine components use a conventional key-and-keyway arrangement.
The choice should therefore be based on the mechanical interface rather than simply the electrical specifications.
9. Resolver Feedback
The MPL-B320P-RK72AA uses resolver feedback.
A resolver is a rotary position-feedback device that provides rotor position information to the servo drive.
The feedback system allows the servo controller to operate the motor in a closed-loop manner.
This is important in applications where the machine needs controlled acceleration, controlled speed, repeatable positioning, and coordinated movement.
Resolver feedback is also a mature industrial feedback technology and is commonly associated with demanding automation environments.
The resolver is part of the complete motion-control system, so the motor should be paired with a compatible drive and feedback interface.
10. No Integral Brake
The RK72AA configuration does not include an integral motor brake.
This is an important consideration when selecting the motor for a vertical axis or another application where the load may move when motor torque is removed.
If a vertical load must remain mechanically held when the motor is disabled, the machine may require a separate holding mechanism or a brake-equipped motor configuration.
The corresponding brake-equipped keyless model is the MPL-B320P-RK74AA.
The non-brake configuration can be useful when the machine does not require a motor-mounted holding brake or when the machine already includes another suitable holding mechanism.
11. SpeedTEC DIN Connector
The motor uses a SpeedTEC DIN connector in a right-angle configuration.
The connector is designed to provide flexibility in machine installation, and the connector position can be rotated through 180 degrees.
This is useful when the motor is installed in a compact machine where a straight connector could interfere with guarding, structural members, cable trays, gearboxes, or other equipment.
Proper cable support is important.
Servo cables should be routed without excessive bending, twisting, pulling, or unsupported weight at the connector.
Good cable routing can reduce mechanical stress on the motor connector and improve long-term system reliability.
12. Low-Inertia Construction
The MPL-B320P-RK72AA belongs to the low-inertia MPL family.
The B320P family has a rotor inertia of approximately:
0.000078 kg·m²
Low rotor inertia is useful in applications that require frequent changes in motor speed.
When the motor has relatively low rotating inertia, the servo drive can change motor speed more quickly, provided that the load inertia and mechanical system are appropriately matched.
Typical examples include:
- High-speed indexing
- Pick-and-place equipment
- Packaging machinery
- Electronic assembly machines
- Labeling machines
- Cutting systems
- Material handling
- Rotary positioning
- Automated production equipment
Low motor inertia alone does not guarantee fast machine response.
The total reflected load inertia, coupling stiffness, gearbox ratio, load torque, machine resonance, and servo tuning must also be considered.
13. Product Dimensions and Weight
Because physical dimensions are critical when replacing a servo motor, the mechanical envelope should be checked carefully before installation.
The B320P family uses a 100 mm frame and 50.8 mm magnetic stack.
| Physical Parameter | MPL-B320P-RK72AA |
|---|---|
| Frame Size | 100 mm |
| Magnetic Stack | 50.8 mm |
| Frame Class | Frame 3 |
| Mounting | IEC metric flange |
| Shaft | Keyless |
| Connector | Right-angle SpeedTEC DIN |
| Connector Rotation | 180° |
| Approx. Overall Dimensions | 42.8 × 21.7 × 26.0 cm |
| Approx. Weight | 3.7–3.9 kg |
The dimensional value above should be treated as an approximate B320P-family envelope rather than a substitute for the exact mechanical installation drawing.
The actual installed envelope can also be affected by connector orientation, cable bend radius, coupling arrangement, and mounting configuration.
14. Main Applications
14.1 Packaging Machinery
Packaging equipment frequently requires fast, repeatable servo movement.
The MPL-B320P-RK72AA can be used for feed rollers, indexing mechanisms, cutting mechanisms, product positioning, conveyor synchronization, and other rotary axes.
The 5000 RPM rating provides substantial speed capability for high-cycle machinery.
14.2 Automated Assembly Equipment
Assembly machines often require several servo axes working together.
The motor can be used for rotary positioning, indexing tables, feeders, transfer mechanisms, tooling stations, and other controlled movements.
Resolver feedback allows the motion system to monitor motor position during operation.
14.3 Material Handling
Servo motors can be used in automated handling systems where a conveyor, roller, rotary actuator, or transfer mechanism requires controlled movement.
The keyless shaft can be convenient for applications using suitable clamp-style couplings.
14.4 Printing and Converting Equipment
Printing and converting equipment often requires synchronized rotary movement.
Servo control can be used for electronic gearing, speed matching, registration, indexing, tension-related mechanisms, and coordinated machine axes.
The low-inertia motor construction can be useful when the machine performs repeated speed changes.
14.5 Labeling Equipment
Labeling machinery often combines high-speed operation with precise positioning.
The motor can be applied to feed rollers, label handling systems, indexing mechanisms, and synchronized rotary axes.
14.6 Machine Tools
The motor can be used in controlled auxiliary axes, positioning mechanisms, indexing systems, tool-handling mechanisms, and other machine-tool applications where servo control is required.
14.7 Automated Inspection Equipment
Inspection systems often require repeatable movement of cameras, sensors, fixtures, or workpieces.
A servo motor can provide controlled positioning and repeatable rotary movement.
The exact motor selection depends on the load inertia, required acceleration, positioning accuracy, and mechanical transmission.
14.8 Electronic Manufacturing Equipment
Electronic manufacturing equipment frequently uses servo-controlled movement for component handling, indexing, feeding, positioning, and automated assembly.
The compact 100 mm frame can be useful where machine space is limited.
15. Main Product Advantages
15.1 5000 RPM High-Speed Capability
The motor is rated for 5000 RPM.
This makes it suitable for applications requiring relatively high-speed servo operation.
15.2 1.5 kW Rated Output
The 1.5 kW rating provides a useful level of motor power for general industrial automation.
It allows the motor to serve as a practical middle-range option between smaller and larger MPL motor configurations.
15.3 3.05 N·m Continuous Torque
The continuous stall torque is approximately 3.05 N·m.
This provides useful continuous torque capability for many automated machine axes.
15.4 7.91 N·m Peak Torque
The peak stall torque is approximately 7.91 N·m.
The higher short-duration torque capability is useful during acceleration, deceleration, indexing, or temporary load events.
15.5 Low Rotor Inertia
The approximately 0.000078 kg·m² rotor inertia supports responsive speed changes.
This can be particularly useful in applications with frequent acceleration and deceleration.
15.6 Resolver Feedback
The resolver provides closed-loop rotor-position feedback.
This allows the motor to operate as part of a controlled servo system rather than as a simple open-loop motor.
15.7 Keyless Shaft
The keyless shaft can simplify mechanical integration where the machine uses a suitable clamping coupling or similar connection.
It also avoids dependence on a traditional shaft key for torque transmission.
15.8 No Integral Brake
The absence of an integral brake reduces the motor configuration compared with brake-equipped versions.
For horizontal axes and applications where an external holding mechanism is unnecessary, a no-brake configuration can be appropriate.
15.9 Rotatable Right-Angle Connector
The 180° rotatable connector provides additional flexibility for cable routing.
This is valuable when the motor is installed in compact machine structures.
16. Advantages for Machine Builders
The MPL-B320P-RK72AA provides several practical advantages when designing automated equipment.
Its 100 mm frame gives the machine builder a relatively compact servo motor package while maintaining 1.5 kW output and 5000 RPM speed capability.
The keyless shaft can be particularly useful for standardized coupling arrangements.
The resolver feedback system provides the feedback required for closed-loop servo operation.
The right-angle connector can simplify cable routing and reduce interference with nearby machine components.
The absence of a brake keeps the motor configuration focused on applications where shaft holding is not required.
17. Advantages for Retrofit Applications
For retrofit projects, the MPL-B320P-RK72AA can be considered when the existing motor specification calls for a B320P-size motor with resolver feedback and a keyless shaft.
Before replacing an existing motor, the following characteristics should be compared carefully.
| Replacement Check | MPL-B320P-RK72AA |
|---|---|
| Brand | Allen-Bradley |
| Series | MP-Series MPL |
| Frame | 100 mm |
| Stack | 50.8 mm |
| Voltage Class | 400 V AC |
| Armature Voltage | 460 V |
| Rated Power | 1.5 kW |
| Rated Speed | 5000 RPM |
| Continuous Torque | 3.05 N·m |
| Peak Torque | 7.91 N·m |
| Feedback | Resolver |
| Shaft | Keyless |
| Brake | No brake |
| Connector | SpeedTEC DIN, right-angle |
| Mounting | IEC metric |
| Approx. Dimensions | 42.8 × 21.7 × 26.0 cm |
| Approx. Weight | 3.7–3.9 kg |
A replacement should not be selected based only on power and frame size.
Feedback compatibility, shaft arrangement, connector type, brake requirements, mechanical dimensions, load inertia, and servo-drive compatibility should all be verified.
18. Five Related or Same-Series Models
The following five models are closely related to the MPL-B320P-RK72AA.
| Model | Feedback | Shaft | Brake | Speed | Power | Continuous Torque | Frame / Stack | Approx. Dimensions | Weight |
|---|---|---|---|---|---|---|---|---|---|
| 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. 6–7 kg |
| 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. 6–7 kg |
| MPL-B320P-MK72AA | Multi-turn absolute encoder | 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. 3.7–4.0 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 |
These models share the same general B320P motor platform, while the feedback, shaft, and brake configurations vary.
The MPL-B320P-RK74AA is particularly close to the RK72AA because it retains the resolver and keyless shaft but adds a 24 V DC brake.
The MPL-B320P-RJ72AA changes only the shaft arrangement within the basic resolver/no-brake configuration, using a keyed shaft instead of the keyless shaft.
The MPL-B320P-MK72AA changes the feedback technology from resolver to multi-turn absolute encoder while retaining the keyless, no-brake arrangement.
19. Related Model Comparison
| Feature | MPL-B320P-RK72AA | MPL-B320P-RJ72AA | MPL-B320P-RK74AA | MPL-B320P-MK72AA | MPL-B320P-MJ74AA |
|---|---|---|---|---|---|
| Frame | 100 mm | 100 mm | 100 mm | 100 mm | 100 mm |
| Stack | 50.8 mm | 50.8 mm | 50.8 mm | 50.8 mm | 50.8 mm |
| Speed | 5000 RPM | 5000 RPM | 5000 RPM | 5000 RPM | 5000 RPM |
| Power | 1.5 kW | 1.5 kW | 1.5 kW | 1.5 kW | 1.5 kW |
| Continuous Torque | 3.05 N·m | 3.05 N·m | 3.05 N·m | 3.05 N·m | 3.05 N·m |
| Feedback | Resolver | Resolver | Resolver | Multi-turn absolute | Multi-turn absolute |
| Shaft | Keyless | Keyed | Keyless | Keyless | Keyed |
| Brake | No | No | 24 V DC | No | 24 V DC |
| Connector | SpeedTEC DIN | SpeedTEC DIN | SpeedTEC DIN | SpeedTEC DIN | SpeedTEC DIN |
| Approx. Dimensions | 42.8 × 21.7 × 26.0 cm | 42.8 × 21.7 × 26.0 cm | 42.8 × 21.7 × 26.0 cm | 42.8 × 21.7 × 26.0 cm | 42.8 × 21.7 × 26.0 cm |
| Approx. Weight | 3.7–3.9 kg | Approx. 3.85 kg | Approx. 6–7 kg | 3.7–4.0 kg | 6–7 kg |
20. Five Same-Brand Popular or Common Models
The following models are useful comparison products within the same general Allen-Bradley servo motor portfolio.
| Model | Series | Rated Speed | Rated Power | Continuous Torque | Feedback | Shaft | Brake | Frame / Stack | Approx. Dimensions | Weight |
|---|---|---|---|---|---|---|---|---|---|---|
| MPL-B310P-RK72AA | MPL B-Series | 5000 RPM | 0.77 kW | 1.58 N·m | Resolver | Keyless | No | 100 mm / 25.4 mm | Approx. B310 family envelope | 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 reference | Approx. 4.6–6 kg |
| MPL-B420P-RK72AA | MPL B-Series | 5000 RPM | 1.9 kW | 4.74 N·m | Resolver | Keyless | No | 115 mm / 50.8 mm | Approx. 46 × 23 × 28 cm | Approx. 4.3 kg family reference |
| MPL-B430P-RK72AA | MPL B-Series | 5000 RPM | 2.2 kW | 6.55 N·m | Resolver | Keyless | No | 115 mm / 76.2 mm | Approx. 46 × 23 × 28 cm | Approx. 5.5 kg family reference |
The models above cover several different motor sizes and feedback configurations.
The B310P provides a smaller motor option, while the B330P, B420P, and B430P move toward higher torque and power capability.
The B320P remains a useful middle-size configuration for applications requiring 1.5 kW and 5000 RPM.
21. 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 | 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 | B320 family envelope | Approx. 3.7 kg |
| MPL-B330P | MPL-B330P | 5000 RPM | 1.8 kW | 4.18 N·m | 11.1 N·m | 0.00012 kg·m² | B330 family envelope | Approx. 4.6 kg |
| MPL-B420P | MPL-B420P | 5000 RPM | 1.9 kW | 4.74 N·m | 13.5 N·m | 0.00026 kg·m² | Approx. 46 × 23 × 28 cm | Approx. 4.3 kg |
| MPL-B430P | MPL-B430P | 5000 RPM | 2.2 kW | 6.55 N·m | 19.8 N·m | 0.00038 kg·m² | Approx. 46 × 23 × 28 cm | Approx. 5.5 kg |
The B320P sits between the smaller B310P and larger B330P configurations in terms of power and torque.
The B320P offers 1.5 kW of rated output, 3.05 N·m of continuous stall torque, and 7.91 N·m of peak stall torque.
The B330P provides a higher torque level, while the B310P offers a smaller motor configuration for applications with lower power requirements.
22. Application Selection by Motor Characteristic
| Requirement | MPL-B320P-RK72AA Characteristics |
|---|---|
| High rotational speed | 5000 RPM |
| Moderate industrial servo power | 1.5 kW |
| Continuous torque | 3.05 N·m |
| Short-duration peak torque | 7.91 N·m |
| Feedback requirement | Resolver |
| Mechanical connection | Keyless shaft |
| Brake requirement | No integral brake |
| Compact motor frame | 100 mm |
| Magnetic stack | 50.8 mm |
| Cable routing | Right-angle, 180° rotatable connector |
| Servo response | Low-inertia construction |
| Mounting | IEC metric |
| Approx. Dimensions | 42.8 × 21.7 × 26.0 cm family reference |
| Approx. Weight | 3.7–3.9 kg |
23. Installation Recommendations
The motor should be installed on a rigid mounting surface capable of maintaining alignment under the expected mechanical load.
Correct shaft alignment is particularly important in servo applications.
Misalignment can increase bearing loading, coupling stress, vibration, heat generation, and servo following errors.
The keyless shaft should be connected using a properly selected coupling or mechanical transmission system.
The coupling should be capable of transmitting the required continuous and peak torque.
Cable routing should provide sufficient clearance around the right-angle connector.
The connector should not be used as a mechanical support point for the cable.
24. Servo System Integration
The motor should be considered as one part of a complete motion-control system.
The system normally includes:
- Servo motor
- Servo drive
- Motion controller
- Feedback circuit
- Motor power cable
- Feedback cable
- Mechanical coupling
- Machine load
- Control software
- Safety system
The servo drive must be compatible with the motor’s electrical and feedback characteristics.
The resolver feedback must also be correctly recognized by the drive.
Correct motor configuration inside the drive is essential for proper current regulation, speed control, and position control.
25. Servo Tuning
Servo tuning should take the complete mechanical system into account.
Important parameters include:
- Motor rotor inertia
- Load inertia
- Reflected load inertia
- Gear ratio
- Coupling stiffness
- Mechanical resonance
- Acceleration
- Deceleration
- Load torque
- Required settling time
- Positioning accuracy
- Operating speed
- Machine cycle time
The low-inertia design of the B320P can provide good response characteristics, but the actual machine performance depends on the complete motor-load combination.
A mechanically flexible system can still experience vibration or resonance even when the motor itself has low rotor inertia.
26. Maintenance
Routine maintenance should include inspection of the motor mounting and mechanical transmission.
Recommended inspection points include:
- Motor mounting bolts
- Coupling condition
- Shaft connection
- Cable condition
- Connector condition
- Mechanical alignment
- Motor temperature
- Abnormal vibration
- Abnormal noise
- Servo following error
- Positioning repeatability
- Machine cycle performance
Because this configuration has no integral brake, the machine should also be checked for any external mechanism used to hold a vertical or gravity-loaded axis.
27. Important Selection Considerations
When selecting the MPL-B320P-RK72AA, the following points should be checked.
Power Requirement
The application should require approximately 1.5 kW or otherwise fall within the motor’s usable operating envelope.
Torque Requirement
The continuous machine torque should be evaluated against the approximately 3.05 N·m continuous stall torque specification.
Peak acceleration requirements should also be compared with the approximately 7.91 N·m peak torque capability.
Speed Requirement
The application should be compatible with the 5000 RPM speed class.
Feedback Requirement
The machine’s servo drive must support the resolver feedback configuration.
Shaft Requirement
The machine must be compatible with the keyless shaft configuration.
Brake Requirement
The machine should not require an integral motor-mounted brake unless an appropriate external holding mechanism is provided.
Mechanical Envelope
The 100 mm frame, 50.8 mm stack, connector position, cable routing, and coupling arrangement should all be considered.
28. Detailed Product Specification Summary
| Specification | MPL-B320P-RK72AA |
|---|---|
| Brand | Allen-Bradley |
| Product Family | MP-Series MPL |
| Series Type | Low-Inertia 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 | 50.8 mm |
| Feedback | Resolver |
| Resolver Type | 2-pole resolver |
| Shaft | Keyless shaft extension |
| Shaft Seal | No shaft seal |
| Brake | No integral brake |
| Connector | SpeedTEC DIN |
| Connector Orientation | Right-angle |
| Connector Rotation | 180° |
| Mounting | IEC metric flange |
| Mounting Hole Type | 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 |
| Approx. Weight | 3.7–3.9 kg |
| Typical Applications | Packaging, assembly, handling, indexing, machine automation |
| Shaft Holding Brake | Not included |
| Servo Feedback | Resolver |
| Motor Construction | Brushless permanent-magnet servo |
29. Final Product Overview
The Allen-Bradley MPL-B320P-RK72AA is a 1.5 kW, 5000 RPM low-inertia AC rotary servo motor designed for industrial motion-control applications.
Its main characteristics are the 100 mm frame size, 50.8 mm magnetic stack, resolver feedback, keyless shaft, no integral brake, and right-angle SpeedTEC DIN connector.
The 5000 RPM speed rating makes it suitable for high-speed machine axes, while the 3.05 N·m continuous stall torque and 7.91 N·m peak torque provide useful torque capability for acceleration, positioning, indexing, and other dynamic motion requirements.
The low rotor inertia of approximately 0.000078 kg·m² is particularly useful for applications involving repeated acceleration and deceleration.
The resolver feedback allows the motor to operate within a closed-loop servo system, giving the motion controller information about rotor position.
The keyless shaft is an important mechanical feature. It is well suited to machine designs using appropriate clamping couplings or other shaft connections that do not depend on a traditional keyway.
The absence of an integral brake makes this configuration different from the RK74AA. For applications requiring shaft holding capability, a brake-equipped configuration or a separate mechanical holding solution should be considered.
The right-angle SpeedTEC DIN connector, with 180° rotational flexibility, is useful in compact machine installations where cable routing can otherwise become a mechanical design problem.
For replacement or retrofit work, the most important parameters to verify are the motor frame, stack length, voltage class, power, torque, speed, resolver feedback, keyless shaft arrangement, brake requirement, connector type, physical dimensions, and total motor weight.
Overall, the MPL-B320P-RK72AA is a compact industrial servo motor configuration intended for controlled rotary motion, high-speed operation, closed-loop feedback, rapid response, and applications where a keyless shaft and brake-free configuration are appropriate.
30. Quick Reference
| Item | MPL-B320P-RK72AA |
|---|---|
| Brand | Allen-Bradley |
| Series | MP-Series MPL |
| Type | Low-Inertia AC Rotary Servo Motor |
| Rated Power | 1.5 kW |
| Rated Speed | 5000 RPM |
| Maximum Speed | 5000 RPM |
| Continuous Torque | 3.05 N·m |
| Peak Torque | 7.91 N·m |
| Feedback | Resolver |
| Shaft | Keyless |
| Brake | No Integral Brake |
| Voltage Class | 400 V AC |
| Armature Voltage | 460 V |
| Frame | 100 mm |
| Stack | 50.8 mm |
| Connector | SpeedTEC DIN |
| Connector Style | Right-angle |
| Connector Rotation | 180° |
| Mounting | IEC Metric |
| Rotor Inertia | Approx. 0.000078 kg·m² |
| Approx. Dimensions | 42.8 × 21.7 × 26.0 cm |
| Approx. Weight | 3.7–3.9 kg |
| Typical Use | Industrial servo motion control |
| Typical Applications | Packaging, assembly, material handling, indexing, positioning, machine automation |