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Allen-Bradley MPL-B310P-RK72AA Servo Motor
1. Product Overview
The Allen-Bradley MPL-B310P-RK72AA is an MP-Series MPL low-inertia brushless AC servo motor designed for industrial motion-control applications that require controlled speed, accurate positioning, rapid acceleration, and stable operation under changing machine loads.
This model belongs to the 480 V AC class of MPL rotary servo motors and uses a 100 mm frame size with a 25.4 mm magnet stack length. The motor is rated for a maximum shaft speed of 5000 rpm and uses a resolver feedback system. It is supplied with a keyless shaft extension, a right-angle SpeedTEC DIN connector, and a mounting arrangement based on IEC metric dimensions.
The RK72AA configuration is a no-brake version. This makes it particularly suitable for applications where the mechanical load does not require an integrated holding brake or where the machine uses a separate mechanical holding arrangement.
The product is part of the MPL low-inertia servo motor family, which was developed for applications where motor response, compact construction, and repeatable motion are important. The motor is intended to operate as part of a complete servo system rather than as a conventional fixed-speed induction motor.
2. Basic Product Parameters
| Parameter | Specification |
|---|---|
| Model | MPL-B310P-RK72AA |
| Brand | Allen-Bradley |
| Series | MP-Series MPL |
| Product Type | Low-Inertia Brushless AC Servo Motor |
| Motor Category | Rotary Servo Motor |
| Voltage Class | 480 V AC class |
| Armature Voltage | 460 V |
| Frame Size | 3 / 100 mm |
| Magnet Stack Length | 10 / 25.4 mm |
| Maximum Shaft Speed | 5000 rpm |
| Feedback | Resolver |
| Brake | No brake |
| Shaft Configuration | Keyless shaft extension |
| Connector | SpeedTEC DIN connector |
| Connector Orientation | Right-angle |
| Connector Rotation | 180° rotatable |
| Mounting Standard | IEC metric |
| Mounting Holes | Free mounting holes, Type FF |
| Motor Construction | Brushless servo motor |
| Dimensions | 100 mm frame class; 25.4 mm magnet stack; complete envelope depends on mechanical configuration |
| Weight | Exact model weight should be confirmed against the applicable mechanical drawing; do not substitute the weight of another MPL configuration |
The core identification above corresponds to the manufacturer’s listed configuration for this exact model: 460 V armature voltage, 100 mm frame size, 25.4 mm stack, 5000 rpm, resolver feedback, keyless shaft, right-angle SpeedTEC connector, and no brake.
3. Brand
Brand: Allen-Bradley
Allen-Bradley is the brand associated with this industrial servo motor family.
The model designation MPL-B310P-RK72AA is part of the MPL range of low-inertia brushless servo motors.
For replacement work, the complete catalog number is important. The letters and numbers at the end of the model are not simply cosmetic variations. They identify important mechanical, feedback, shaft, connector, brake, and mounting characteristics.
4. Product Series
Series: MP-Series MPL Low-Inertia Brushless Servo Motors
The MPL family is designed around the requirements of industrial motion control.
Compared with a standard industrial motor, a servo motor is intended to work with a feedback device and servo drive so that the control system can continuously monitor motor position and speed.
The MPL family covers multiple frame sizes, stack lengths, feedback arrangements, shaft configurations, connector configurations, and brake options.
The MPL-B310P-RK72AA sits in the 100 mm frame class and uses a relatively short 25.4 mm magnet stack. This gives the motor a compact form compared with longer-stack motors in the same frame family.
5. Meaning of the MPL-B310P-RK72AA Model Number
The model number provides useful information when selecting a replacement.
| Model Section | Meaning / Identification |
|---|---|
| MPL | MPL low-inertia brushless servo motor family |
| B | 480 V AC class |
| 3 | Frame-size group 3 |
| 10 | 25.4 mm magnet stack length |
| P | Motor performance/frame designation |
| R | Resolver feedback configuration |
| K | Keyless shaft configuration |
| 72 | Connector/feedback configuration associated with this motor version |
| AA | Specific catalog configuration |
The complete model should always be treated as one catalog number.
For example, replacing MPL-B310P-RK72AA with an apparently similar MPL motor is not automatically acceptable. A motor with the same frame size can still have a different feedback system, shaft style, brake arrangement, connector configuration, or electrical characteristics.
6. Detailed Technical Parameters
| Technical Item | MPL-B310P-RK72AA |
|---|---|
| Model | MPL-B310P-RK72AA |
| Brand | Allen-Bradley |
| Series | MP-Series MPL |
| Motor Type | Brushless AC servo motor |
| Application Type | Industrial motion control |
| AC Voltage Class | 480 V |
| Armature Voltage | 460 V |
| Frame Size | 100 mm |
| Frame Designation | Frame Size 3 |
| Magnet Stack | 25.4 mm |
| Stack Designation | 10 |
| Maximum Speed | 5000 rpm |
| Feedback Type | Resolver |
| Brake | None |
| Shaft | Keyless |
| Connector | SpeedTEC DIN |
| Connector Position | Right-angle |
| Connector Rotation | 180° rotatable |
| Mounting | IEC metric |
| Mounting Hole Type | Free mounting holes, Type FF |
| Construction | Low-inertia brushless servo |
| Dimensions | 100 mm frame class; 25.4 mm stack; overall envelope must be checked against the mechanical drawing |
| Weight | Exact catalog weight should be confirmed from the applicable mechanical drawing |
7. Product Introduction
The MPL-B310P-RK72AA is intended for machine builders and maintenance departments that need a controlled rotary motor for servo-based automation.
The motor is not intended to be used like a simple three-phase induction motor connected directly to a conventional motor starter. Its performance depends on the complete motion-control system, including the servo drive, feedback circuit, motor power connection, and machine mechanics.
The low-inertia construction allows the motor to respond quickly to changes in command speed and position.
This characteristic is useful in machines where the motor repeatedly accelerates, decelerates, stops, reverses, or follows a programmed motion profile.
The 5000 rpm speed capability provides a useful operating range for machinery requiring relatively fast rotary motion.
The resolver feedback configuration is another important characteristic. The feedback device allows the control system to determine motor position and speed so that the servo drive can regulate the motor accurately.
8. Resolver Feedback
One of the most important characteristics of the MPL-B310P-RK72AA is its resolver feedback configuration.
A resolver is an electromechanical feedback device used to provide rotor-position information to the servo control system.
Resolver-based feedback is often selected for industrial machinery where robust feedback operation is valued.
When replacing a resolver-based MPL motor, it is important not to substitute an encoder version simply because the motor has the same frame size.
The servo drive and feedback interface must be compatible with the motor’s actual feedback configuration.
This is especially important when dealing with older machinery because the original servo amplifier may have been configured specifically around the original motor and feedback type.
9. Keyless Shaft Design
The RK configuration uses a keyless shaft extension.
This is an important mechanical distinction.
A keyless shaft arrangement can be useful in applications using suitable couplings or other mechanical transmission components designed for clamping onto a smooth shaft.
The shaft should not be treated as interchangeable with a keyed-shaft motor.
Before installation, the coupling, bore size, clamping mechanism, allowable shaft load, alignment, and motor shaft dimensions should all be checked.
A mechanically compatible coupling is just as important as electrical compatibility.
10. No-Brake Configuration
The MPL-B310P-RK72AA is a non-brake motor.
This means the motor does not include an integrated holding brake.
That characteristic can be an advantage in applications where the machine does not require the motor to mechanically hold a vertical load when servo power is removed.
It also simplifies the motor configuration because there is no integrated brake coil requiring a brake supply and brake-control circuit.
However, a non-brake motor should not be used as a direct replacement for a brake-equipped motor when the machine depends on the brake for load holding or safety-related stopping.
For vertical axes, gravity-loaded mechanisms, lifting systems, and machines where the motor must remain mechanically locked during power loss, the brake requirement should be evaluated separately.
11. 100 mm Frame Size
The motor uses a 100 mm frame size.
This is a substantial step above the smaller MPL frame groups and is intended for machines requiring a larger motor body and greater mechanical capability.
The frame size is particularly important when checking replacement compatibility.
The frame determines more than the physical outside diameter of the motor.
It affects:
- Mounting-hole dimensions
- Motor body size
- Shaft position
- Coupling alignment
- Available motor torque range
- Overall machine envelope
- Motor mounting structure
- Required clearance around the connector
For this reason, frame size should always be checked together with stack length and shaft configuration.
12. 25.4 mm Magnet Stack
The MPL-B310P-RK72AA uses a 25.4 mm magnet stack, corresponding to the “10” stack designation.
This is a relatively short stack configuration within the MPL family.
A short motor stack can be useful where cabinet or machine-space limitations make motor length important.
The motor therefore provides a useful combination of a larger 100 mm frame with a short 25.4 mm stack.
This arrangement can be particularly useful in machinery where radial mounting space is available but axial motor length must be controlled.
13. 5000 RPM Operating Capability
The specified maximum shaft speed is 5000 rpm.
This makes the motor suitable for applications requiring relatively fast rotary motion.
High-speed servo motors can be useful in:
- Rotary indexing
- Packaging equipment
- Machine tools
- Material handling
- Printing equipment
- Automated assembly
- Cutting systems
- Web-handling systems
- Pick-and-place mechanisms
- High-speed positioning mechanisms
The actual operating speed in a machine should always be selected according to the load, acceleration profile, drive settings, mechanical transmission, duty cycle, and application requirements.
14. Main Product Advantages
14.1 Low-Inertia Construction
The low-inertia design is one of the main characteristics of the MPL family.
A lower rotor inertia can allow the servo system to accelerate and decelerate the motor rapidly.
This is valuable in machines that repeatedly change speed.
For example, an indexing machine may accelerate the motor rapidly, reach a commanded position, decelerate, stop, and then immediately repeat the sequence.
A low-inertia servo motor is well suited to this type of operation.
14.2 Fast Dynamic Response
Servo systems are normally selected when ordinary motor control cannot provide sufficient positioning performance.
The MPL-B310P-RK72AA can operate as part of a closed-loop motion system.
The controller provides a command, the servo drive energizes the motor, and the feedback device provides motor-position information back to the control system.
This creates a continuous control loop.
14.3 5000 RPM Speed Capability
The 5000 rpm rating provides a useful combination of speed and machine-control capability.
It allows the motor to support fast machine cycles without requiring an unnecessarily large motor body for every application.
14.4 Resolver Feedback
Resolver feedback provides a robust method of determining motor position.
This is particularly useful in industrial environments where dependable feedback operation is important.
It also provides a clearly identifiable difference between the RK configuration and encoder-based MPL versions.
14.5 Compact Stack Configuration
The 25.4 mm stack is useful where axial motor length must be controlled.
A machine designer may prefer a shorter motor where the motor is installed inside a compact mechanical assembly.
14.6 Keyless Shaft
The keyless shaft configuration provides flexibility when a suitable clamping coupling is used.
This can be useful in machine designs where precise coupling installation and alignment are required.
14.7 No Integrated Brake
For machines that do not need a holding brake, the no-brake configuration can simplify the motor installation.
It removes the need to control an integrated brake coil and can reduce the number of motor-side functions that must be connected.
15. Typical Applications
15.1 Automated Assembly Machines
The MPL-B310P-RK72AA can be used in automated assembly equipment where components must be moved through repeatable sequences.
Typical examples include rotary mechanisms, indexing systems, transfer mechanisms, and positioning stations.
Servo control is especially useful when the machine must repeatedly move to specific positions rather than simply rotate continuously.
15.2 Packaging Machinery
Packaging equipment frequently requires rapid acceleration and deceleration.
A servo motor can control conveyors, rollers, indexing mechanisms, cutting systems, sealing mechanisms, and other rotating machine elements.
The 5000 rpm capability can be useful when high machine cycle rates are required.
15.3 Printing and Web Handling
Rotary servo motors are commonly used in printing and web-processing machinery where speed synchronization is important.
The servo system can coordinate the motor with other axes and maintain commanded motion relationships.
15.4 Material Handling Equipment
The motor can be used in automated material-handling machinery where controlled acceleration, speed, and positioning are needed.
Examples include conveyor drive systems, indexing mechanisms, transfer units, and rotary positioning stations.
15.5 Machine Tools
Servo motors are widely used in machine tools because accurate control of rotary motion is important.
The MPL-B310P-RK72AA can be considered for suitable machine-tool auxiliary axes and other rotary mechanisms when the electrical and mechanical requirements match.
15.6 Cutting and Processing Machinery
Cutting equipment often requires synchronized rotary motion.
The servo motor can provide controlled movement to rollers, rotary cutters, feed mechanisms, and other machine components.
15.7 Automated Inspection Systems
Inspection machines frequently require repeatable movement between measurement positions.
The servo motor can provide controlled rotary positioning for inspection fixtures, rotary tables, or material positioning systems.
16. Application Advantages
| Application | Why the MPL-B310P-RK72AA Can Be Useful | Important Selection Point |
|---|---|---|
| Packaging | Fast acceleration and controlled positioning | Check duty cycle and load inertia |
| Assembly | Repeatable servo positioning | Check feedback compatibility |
| Material Handling | Controlled speed and acceleration | Check shaft and coupling load |
| Machine Tools | Closed-loop rotary control | Check drive and feedback requirements |
| Printing | Speed synchronization | Check continuous operating duty |
| Inspection Machinery | Repeatable positioning | Check required positioning accuracy |
| Indexing Systems | Rapid start-stop motion | Check inertia matching |
| Processing Equipment | Controlled rotary motion | Check continuous torque requirements |
17. Dimensions and Mechanical Installation
The confirmed dimensional characteristics for this model include the 100 mm frame size and 25.4 mm magnet stack length.
The complete motor envelope includes more than the active magnet stack.
The final installation dimensions can also be affected by:
- Shaft extension
- Connector position
- Connector clearance
- Mounting flange
- Rear motor housing
- Feedback connector
- Cable bend radius
- Coupling
For that reason, the 100 mm frame and 25.4 mm stack should not be interpreted as the complete outside dimensions of the assembled motor.
| Mechanical Parameter | Specification |
|---|---|
| Model | MPL-B310P-RK72AA |
| Frame Size | 100 mm |
| Magnet Stack | 25.4 mm |
| Shaft Type | Keyless |
| Mounting | IEC metric |
| Mounting Hole Style | Free mounting holes, Type FF |
| Connector | Right-angle SpeedTEC DIN |
| Connector Rotation | 180° |
| Overall Dimensions | Must be checked against the applicable mechanical drawing for final installation |
| Weight | Exact weight should be confirmed from the applicable mechanical drawing or product data |
18. Electrical Characteristics
The MPL-B310P-RK72AA is identified as a 460 V armature / 480 V class AC servo motor.
The motor should be operated through a compatible servo drive rather than connected directly to a conventional fixed-frequency motor starter.
The servo drive controls the motor current, speed, acceleration, deceleration, and position according to the machine’s motion requirements.
| Electrical Parameter | Specification |
|---|---|
| Model | MPL-B310P-RK72AA |
| Motor Type | AC brushless servo |
| Voltage Class | 480 V AC |
| Armature Voltage | 460 V |
| Feedback | Resolver |
| Brake | No brake |
| Maximum Speed | 5000 rpm |
| Drive Requirement | Compatible servo drive |
| Control Method | Closed-loop servo control |
| Connector Type | SpeedTEC DIN |
| Dimensions | 100 mm frame; 25.4 mm stack |
| Weight | Exact value should be confirmed from the applicable mechanical documentation |
19. Maintenance Considerations
The MPL-B310P-RK72AA is intended for industrial machinery, but proper maintenance remains important.
Motor replacement should begin with verification of the complete catalog number.
The technician should compare:
- Motor model
- Voltage class
- Frame size
- Stack length
- Feedback type
- Shaft type
- Brake configuration
- Connector arrangement
- Mounting dimensions
- Servo drive compatibility
A motor that appears physically similar may still be electrically incompatible.
20. Replacement Considerations
When replacing an existing MPL motor, the complete suffix should be checked rather than matching only the first several characters.
For example, MPL-B310P-RK72AA and another MPL-B310P model may share the same frame size but use different feedback or shaft configurations.
The R resolver designation and K keyless-shaft configuration are especially important when selecting the replacement.
The absence of a brake must also be confirmed.
21. Five Related or Same-Series Models
The following models are useful comparisons within the MPL family. They are not automatically direct substitutes for the MPL-B310P-RK72AA.
| Model | Series / Type | Voltage Class | Frame / Stack | Speed Class | Feedback / Configuration | Brake | Dimensions | Weight |
|---|---|---|---|---|---|---|---|---|
| MPL-B310P-RJ72AA | MPL servo motor | 480 V class | 100 mm / 25.4 mm | 5000 rpm | Resolver, keyed shaft | No brake | 100 mm frame; 25.4 mm stack | Verify exact catalog weight |
| MPL-B310P-RK74AA | MPL servo motor | 480 V class | 100 mm / 25.4 mm | 5000 rpm | Resolver, keyless shaft | Brake configuration | 100 mm frame; 25.4 mm stack | Verify exact catalog weight |
| MPL-B310P-SJ72AA | MPL servo motor | 480 V class | 100 mm / 25.4 mm | 5000 rpm | High-resolution encoder configuration, keyed shaft | No brake | 100 mm frame; 25.4 mm stack | Verify exact catalog weight |
| MPL-B310P-SK72AA | MPL servo motor | 480 V class | 100 mm / 25.4 mm | 5000 rpm | High-resolution encoder configuration, keyless shaft | No brake | 100 mm frame; 25.4 mm stack | Verify exact catalog weight |
| MPL-B320P-RK72AA | MPL servo motor | 480 V class | 100 mm / 50.8 mm | 5000 rpm class | Resolver, keyless shaft | No brake | 100 mm frame; 50.8 mm stack | Verify exact catalog weight |
These models are closely related because they share the MPL family and, in several cases, the same 100 mm frame and 25.4 mm stack class. The differences in feedback, shaft style, brake option, or stack length are important when choosing a replacement. The B310P-RJ/RK/SJ/SK variants and B320P variants are documented within the same MPL product range.
22. Five Common Same-Brand MPL Models
The following five models are useful additional references from the same MPL family. They are included as comparison models rather than as guaranteed substitutes.
| Model | Product Type | Voltage Class | Frame / Stack | Speed Class | Feedback / Configuration | Brake | Dimensions | Weight |
|---|---|---|---|---|---|---|---|---|
| MPL-B210V-VJ72AA | MPL low-inertia servo motor | 480 V class | Smaller frame class | High-speed class | Servo feedback configuration | No brake | Compact MPL frame; exact envelope varies | Verify exact catalog weight |
| MPL-B220T-VJ72AA | MPL low-inertia servo motor | 480 V class | 75 mm class | 6000 rpm class | Servo feedback configuration | No brake | Approx. 75 mm frame class; exact envelope varies | Verify exact catalog weight |
| MPL-B230P-VJ74AA | MPL low-inertia servo motor | 480 V class | 75 mm class | 5000 rpm class | Servo feedback configuration | Brake configuration | Approx. 75 mm frame class; exact envelope varies | Verify exact catalog weight |
| MPL-B320P-MJ72AA | MPL low-inertia servo motor | 480 V class | 100 mm / 50.8 mm class | 5000 rpm class | Feedback configuration | No brake | 100 mm frame; 50.8 mm stack | Verify exact catalog weight |
| MPL-B330P-MJ72AA | MPL low-inertia servo motor | 480 V class | 100 mm class | 5000 rpm class | Feedback configuration | No brake | 100 mm frame class; longer stack | Verify exact catalog weight |
These are representative MPL models commonly encountered in the same general servo-motor family. Exact electrical ratings and dimensions depend on the complete catalog number and should not be assumed from the family name alone. The MPL-B210V, B220T, B230P, B320P, and B330P model groups are all represented in the MPL product range.
23. Comparison of the Main Related Models
| Model | Frame | Stack | Feedback | Shaft | Brake | Speed Class | Dimensions | Weight |
|---|---|---|---|---|---|---|---|---|
| MPL-B310P-RK72AA | 100 mm | 25.4 mm | Resolver | Keyless | No | 5000 rpm | 100 mm frame / 25.4 mm stack | Verify exact weight |
| MPL-B310P-RJ72AA | 100 mm | 25.4 mm | Resolver | Keyed | No | 5000 rpm | 100 mm frame / 25.4 mm stack | Verify exact weight |
| MPL-B310P-RK74AA | 100 mm | 25.4 mm | Resolver | Keyless | Brake | 5000 rpm | 100 mm frame / 25.4 mm stack | Verify exact weight |
| MPL-B310P-SJ72AA | 100 mm | 25.4 mm | High-resolution encoder | Keyed | No | 5000 rpm | 100 mm frame / 25.4 mm stack | Verify exact weight |
| MPL-B310P-SK72AA | 100 mm | 25.4 mm | High-resolution encoder | Keyless | No | 5000 rpm | 100 mm frame / 25.4 mm stack | Verify exact weight |
The table shows why the complete catalog number matters. Several motors can have the same frame and stack while differing in shaft type, feedback technology, or brake configuration.
24. Difference Between Keyed and Keyless Versions
The keyless version is identified by the K designation.
The keyed version is represented by the corresponding J configuration in closely related MPL models.
This difference affects the coupling arrangement.
A keyed shaft normally uses a key and matching coupling or pulley arrangement.
A keyless shaft normally relies on a clamping mechanism or another compatible shaft connection.
The two arrangements should not be treated as interchangeable without checking the machine’s mechanical design.
25. Difference Between Brake and No-Brake Models
The MPL family contains both brake and non-brake versions.
The MPL-B310P-RK72AA is the no-brake version.
A brake-equipped version can be useful for applications where the load must be held mechanically when motor power is removed.
However, a brake should not be selected simply because it appears to provide additional safety.
The brake must be compatible with the machine’s control architecture and mechanical requirements.
For vertical axes, it is particularly important to distinguish between servo-controlled stopping and actual mechanical load holding.
26. Servo Drive Compatibility
The motor and servo drive should be treated as a matched motion-control system.
Before installation, confirm:
- Motor voltage class.
- Motor feedback type.
- Servo drive feedback input compatibility.
- Motor power connection.
- Feedback connection.
- Maximum motor speed.
- Continuous and peak load requirements.
- Acceleration and deceleration requirements.
- Motor thermal characteristics.
- Machine inertia.
The resolver configuration is particularly important because an encoder-input drive should not be assumed to accept resolver feedback without the appropriate interface.
27. Mechanical Compatibility
Mechanical compatibility should be checked just as carefully as electrical compatibility.
Important dimensions include:
- Motor frame
- Flange
- Mounting-hole spacing
- Shaft diameter
- Shaft extension
- Shaft length
- Overall motor length
- Connector position
- Connector clearance
- Coupling dimensions
The 100 mm frame and 25.4 mm stack provide useful starting information, but the final mechanical drawing should be used for an actual installation.
28. Machine Design Advantages
The MPL-B310P-RK72AA offers several characteristics that are useful to machine builders.
The 100 mm frame provides a substantial motor platform while the 25.4 mm stack keeps the active motor section relatively short.
The 5000 rpm speed capability supports fast machine cycles.
Resolver feedback provides closed-loop position information.
The keyless shaft allows the use of appropriate clamping-style mechanical couplings.
The no-brake configuration keeps the motor configuration straightforward for applications where a holding brake is not required.
29. Advantages for Maintenance Departments
For maintenance teams, the complete catalog number makes the motor relatively easy to identify.
The model provides clear information about:
- Family
- Voltage class
- Frame
- Stack
- Feedback
- Shaft
- Brake configuration
This is particularly useful when maintaining older automated machinery.
A maintenance department can use the model number as the starting point for checking replacement compatibility instead of relying only on the physical appearance of the motor.
30. Advantages for Machine Builders
For machine builders, the motor offers a combination of:
- Low-inertia servo response
- 5000 rpm speed capability
- 100 mm frame construction
- Short 25.4 mm stack
- Resolver feedback
- Keyless shaft
- No integrated brake
- Right-angle connector
- IEC metric mounting
These characteristics allow the motor to fit a variety of industrial rotary motion applications.
31. Installation Notes
The motor should be installed with adequate mechanical alignment.
Misalignment between the motor shaft and driven equipment can cause:
- Excessive bearing load
- Coupling wear
- Vibration
- Noise
- Increased motor temperature
- Reduced bearing life
- Positioning problems
The motor should also have adequate ventilation and clearance.
Cable routing should prevent excessive force from being transferred to the connector.
The right-angle connector should be given sufficient clearance for installation and cable bending.
32. Resolver Cable Considerations
Because this model uses resolver feedback, the feedback cable should be selected and installed appropriately.
Feedback wiring should be kept away from high-noise power circuits where practical.
Poor cable routing can introduce electrical noise into feedback signals.
During troubleshooting, the feedback circuit should be checked separately from the motor power circuit.
A motor that rotates but produces feedback errors may have a feedback wiring, connector, resolver, or drive-interface problem rather than a mechanical motor problem.
33. Servo Tuning
After replacing a servo motor, the machine may require servo configuration verification.
Even when the replacement motor has the same catalog number, the servo drive should be checked to ensure that the correct motor data is selected.
Important parameters can include:
- Motor identification
- Feedback type
- Motor speed
- Motor current
- Torque limits
- Acceleration
- Deceleration
- Position-loop settings
- Velocity-loop settings
- Electronic gearing
- Mechanical transmission ratio
The exact procedure depends on the servo drive and machine control architecture.
34. Load Inertia and Servo Performance
Servo performance depends heavily on the relationship between motor inertia and machine load inertia.
A motor may be electrically suitable but still perform poorly if the connected load is excessive.
Typical symptoms of poor inertia matching can include:
- Overshoot
- Excessive settling time
- Vibration
- Slow response
- Servo following errors
- Excessive motor heating
- Unstable motion
For this reason, the motor should be evaluated as part of the entire mechanical system.
35. Typical Industries
The MPL-B310P-RK72AA can be considered for applications in industries such as:
- Packaging
- Automated assembly
- Material handling
- Printing
- Converting
- Machine building
- Semiconductor-related automation
- Inspection equipment
- General factory automation
- Processing machinery
- Motion-controlled production equipment
The actual suitability depends on the motor load, speed, duty cycle, environment, and servo-drive system.
36. Product Selection Guide
| Requirement | MPL-B310P-RK72AA Suitability / Consideration | Dimensions | Weight |
|---|---|---|---|
| High-speed rotary motion | Suitable for applications requiring up to 5000 rpm | 100 mm frame / 25.4 mm stack | Verify exact weight |
| Resolver feedback | Appropriate | 100 mm frame / 25.4 mm stack | Verify exact weight |
| Keyless coupling | Appropriate | 100 mm frame / 25.4 mm stack | Verify exact weight |
| Integrated brake required | Not suitable as-is | 100 mm frame / 25.4 mm stack | Verify exact weight |
| Compact axial motor length | Useful due to 25.4 mm stack | 100 mm frame / 25.4 mm stack | Verify exact weight |
| 480 V class servo system | Appropriate class | 100 mm frame / 25.4 mm stack | Verify exact weight |
| Encoder-only drive | Requires compatibility check | 100 mm frame / 25.4 mm stack | Verify exact weight |
| Vertical load holding | Requires separate mechanical/brake evaluation | 100 mm frame / 25.4 mm stack | Verify exact weight |
37. Important Replacement Warning
The MPL-B310P-RK72AA should not be replaced solely according to physical appearance.
Two MPL motors can look nearly identical while having different feedback systems.
The following differences are particularly important:
Resolver versus encoder
Keyed versus keyless shaft
Brake versus no brake
Different stack length
Different connector arrangement
Different voltage class
Different motor performance rating
For this reason, the complete model number should be recorded before ordering a replacement.
38. Practical Summary of the MPL-B310P-RK72AA
| Item | Description |
|---|---|
| Model | MPL-B310P-RK72AA |
| Brand | Allen-Bradley |
| Series | MP-Series MPL |
| Motor Family | Low-Inertia Brushless Servo Motors |
| Motor Type | AC Rotary Servo Motor |
| Voltage Class | 480 V AC |
| Armature Voltage | 460 V |
| Frame | 100 mm |
| Stack | 25.4 mm |
| Speed | 5000 rpm |
| Feedback | Resolver |
| Shaft | Keyless |
| Brake | None |
| Connector | Right-angle SpeedTEC DIN |
| Connector Rotation | 180° |
| Mounting | IEC metric |
| Mounting Hole Type | Free mounting holes, Type FF |
| Dimensions | 100 mm frame / 25.4 mm stack; complete envelope requires mechanical drawing |
| Weight | Exact model weight should be verified from the applicable product drawing |
| Main Application | Industrial closed-loop rotary motion |
| Main Advantage | Low-inertia servo response with resolver feedback and compact 100 mm / 25.4 mm construction |
39. Final Product Description
The Allen-Bradley MPL-B310P-RK72AA is a 480 V-class MPL low-inertia brushless AC rotary servo motor designed for industrial motion-control systems.
Its main configuration characteristics are a 100 mm frame, 25.4 mm magnet stack, 5000 rpm maximum speed, resolver feedback, keyless shaft, right-angle SpeedTEC DIN connector, and no integrated brake.
The motor is well suited to machines where controlled rotary motion, repeatable positioning, rapid acceleration, and closed-loop feedback are required.
Its relatively short 25.4 mm stack makes it attractive for installations where motor length is an important mechanical consideration, while the 100 mm frame provides a larger mounting and motor platform than the smaller MPL frame groups.
The resolver feedback configuration should be considered carefully during replacement because the feedback interface must match the servo drive.
The keyless shaft is another defining feature and should be matched with a suitable coupling or clamping arrangement.
For maintenance and replacement work, the complete MPL-B310P-RK72AA catalog number should be used rather than selecting a motor based only on frame size or physical appearance.
Overall, this model represents a specialized MPL servo configuration for industrial machinery requiring reliable closed-loop rotary motion, relatively high operating speed, low-inertia response, and a compact 100 mm frame / 25.4 mm stack mechanical arrangement.