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Allen-Bradley MPL-B4530F-RK74AA Servo Motor
1. Product Overview
The Allen-Bradley MPL-B4530F-RK74AA is a high-performance MP-Series low-inertia brushless servo motor designed for demanding industrial motion-control applications.
It belongs to the MPL low-inertia servo motor family and is designed around a 460 V AC-class motor platform. The motor uses a resolver feedback system, a keyless shaft configuration, and an integrated 24 V DC holding brake.
The motor has a 130 mm IEC metric frame size and a 76.2 mm magnet stack length. It is rated for approximately 3000 rpm and provides approximately 8.25 N·m of continuous stall torque and 20.3 N·m of peak torque.
This combination makes the MPL-B4530F-RK74AA particularly suitable for automated machinery where controlled acceleration, repeatable positioning, reliable feedback, and a holding brake are required.
The low-inertia construction also makes the motor suitable for machines that repeatedly accelerate, decelerate, index, stop, and reverse direction.
2. Brand and Product Series
| Item | Description |
|---|---|
| Brand | Allen-Bradley |
| Product Family | MP-Series |
| Motor Series | MPL Low-Inertia Servo Motors |
| Product Type | Brushless AC Rotary Servo Motor |
| Motor Category | Low-Inertia Servo Motor |
| Voltage Class | 400 V AC class |
| Typical Motor Voltage | 460 V AC |
| Frame Size | Frame 45 / 130 mm |
| Magnet Stack | 30 / 76.2 mm |
| Feedback | Resolver |
| Shaft Type | Keyless |
| Brake | 24 V DC holding brake |
| Mounting | IEC Metric Flange |
| Connector | SpeedTEC DIN |
| Connector Orientation | Right-angle, rotatable |
| Shaft Seal | No shaft seal |
| Mounting Holes | Free mounting holes / Type FF |
| Rated Speed | 3000 rpm |
| Continuous Stall Torque | 8.25 N·m |
| Peak Torque | 20.3 N·m |
| Rated Output | Approximately 2.1 kW |
| Approximate Weight | 10.9 kg |
The MPL-B4530F-RK74AA can therefore be summarized as a 130 mm-frame, 3000 rpm, resolver-feedback, keyless-shaft, brake-equipped low-inertia servo motor.
3. Main Technical Parameters
| Parameter | MPL-B4530F-RK74AA Specification |
|---|---|
| Model | MPL-B4530F-RK74AA |
| Brand | Allen-Bradley |
| Series | MP-Series MPL Low-Inertia Servo Motors |
| Motor Type | Brushless AC Rotary Servo Motor |
| Voltage Class | 400 V AC |
| Nominal Voltage Class | 460 V AC |
| Frame Size | Frame 45 |
| IEC Frame Diameter | 130 mm |
| Magnet Stack Length | 76.2 mm |
| Stack Code | 30 |
| Rated Speed | 3000 rpm |
| Maximum Speed | Approximately 3000 rpm |
| Continuous Stall Torque | 8.25 N·m |
| Peak Stall Torque | 20.3 N·m |
| Rated Continuous Power | Approximately 2.1 kW |
| Feedback Type | Resolver |
| Shaft Configuration | Keyless |
| Brake | 24 V DC holding brake |
| Mounting Style | IEC Metric Flange |
| Mounting Holes | Free Mounting Holes / Type FF |
| Motor Connector | SpeedTEC DIN |
| Connector Type | Right-angle |
| Connector Rotation | Approximately 180° rotatable |
| Shaft Seal | No |
| Motor Construction | Low-Inertia Brushless |
| Rotor Inertia | Approximately 0.00040 kg·m², depending on feedback configuration |
| Maximum Operating Temperature | Approximately 40 °C |
| Approximate Motor Weight | 10.9 kg |
| Protection / Enclosure | Industrial servo motor construction |
| Application Class | Industrial Motion Control |
4. Dimensions and Mechanical Configuration
The mechanical dimensions are important when replacing an existing servo motor because the motor must fit both the mounting structure and the machine’s transmission components.
The MPL-B4530F-RK74AA uses a 130 mm frame size with a 76.2 mm magnet stack.
The frame size gives the motor a relatively compact footprint for its torque capability, while the low-inertia rotor helps the motor respond quickly to command changes.
| Mechanical Parameter | Specification |
|---|---|
| Model | MPL-B4530F-RK74AA |
| Frame Size | 45 |
| Frame Diameter | 130 mm |
| Magnet Stack Length | 76.2 mm |
| Mounting Standard | IEC Metric |
| Mounting Type | Flange Mount |
| Mounting Holes | Free Mounting Holes / Type FF |
| Shaft Type | Keyless |
| Shaft Seal | None |
| Brake | Integrated 24 V DC holding brake |
| Connector | SpeedTEC DIN |
| Connector Position | Right-angle |
| Connector Rotation | 180° rotatable |
| Approximate Weight | 10.9 kg |
The keyless shaft is an important feature. It eliminates the need for a traditional shaft key arrangement and can simplify certain coupling and mechanical transmission designs.
However, the coupling selected for the machine should be compatible with the motor’s shaft geometry and rated torque.
5. Electrical and Performance Characteristics
The MPL-B4530F-RK74AA is designed around the performance characteristics of the MPL-B4530F motor family.
Its approximately 8.25 N·m continuous stall torque gives the motor a solid continuous torque capability for medium-duty servo axes.
The approximately 20.3 N·m peak torque capability provides additional short-term torque for acceleration, deceleration, indexing, and transient load conditions.
| Performance Parameter | Value |
|---|---|
| Model | MPL-B4530F-RK74AA |
| Rated Speed | 3000 rpm |
| Maximum Speed | 3000 rpm class |
| Continuous Stall Torque | 8.25 N·m |
| Peak Stall Torque | 20.3 N·m |
| Rated Output Power | Approx. 2.1 kW |
| Rotor Inertia | Approx. 0.00040 kg·m² |
| Feedback | Resolver |
| Brake Voltage | 24 V DC |
| Frame | 130 mm |
| Weight | Approx. 10.9 kg |
The relationship between relatively low rotor inertia and available torque is one of the key characteristics of this motor.
In a servo application, the motor does not simply run at a fixed speed like a conventional induction motor. It is continuously commanded to change speed, position, and torque.
The low-inertia design helps reduce the amount of energy required to accelerate the rotor itself, allowing the servo system to respond efficiently to changing commands.
6. Resolver Feedback System
One of the defining characteristics of the MPL-B4530F-RK74AA is its resolver feedback.
A resolver provides the servo controller with motor position information. This information is used to determine rotor position and to coordinate motor current with the motor’s electromagnetic position.
Resolver feedback is often valued in industrial environments because of its robust construction and resistance to certain electrical and environmental disturbances.
Compared with high-resolution digital encoder configurations, a resolver-based motor may be attractive when the application prioritizes ruggedness, long-term serviceability, and stable position feedback.
The resolver configuration also distinguishes the RK74AA from many MPL motors using absolute or high-resolution encoder feedback.
7. Keyless Shaft Design
The MPL-B4530F-RK74AA uses a keyless shaft.
A keyless shaft is useful in applications where the mechanical coupling is designed specifically around a friction-locking or clamping arrangement.
This type of mechanical connection can provide several practical benefits:
- No conventional shaft key is required.
- Coupling installation can be simplified when a suitable keyless coupling is used.
- Shaft positioning can be more flexible during mechanical assembly.
- The mechanical transmission can be designed with a clean shaft interface.
- The coupling system can be optimized for servo motion.
The keyless configuration should always be considered together with the selected coupling, shaft diameter, allowable radial load, allowable axial load, and transmitted torque.
8. Integrated 24 V DC Holding Brake
The RK74AA configuration includes a 24 V DC holding brake.
This is particularly useful for vertical axes, lifting mechanisms, indexing equipment, and machines where the load needs to remain mechanically held after the servo is disabled.
The brake is primarily a holding device, rather than a replacement for normal servo-controlled dynamic braking.
Typical applications include:
- Vertical Z-axis systems.
- Lift mechanisms.
- Pick-and-place equipment with vertical travel.
- Material handling equipment.
- Positioning systems where the load must remain stationary during power-off conditions.
- Machines where the axis must be mechanically held during maintenance or shutdown.
The brake also provides an additional layer of mechanical holding capability when used correctly with the servo control system.
9. Product Introduction
The MPL-B4530F-RK74AA is intended for industrial automation systems that require coordinated motion, repeatable positioning, controlled acceleration, and reliable servo feedback.
Its combination of approximately 2.1 kW output, 8.25 N·m continuous stall torque, 20.3 N·m peak torque, resolver feedback, and a 24 V DC brake places it in a useful range for medium-duty machine axes.
The motor is especially suitable for equipment where the servo axis repeatedly performs acceleration and deceleration cycles rather than simply operating continuously at a fixed speed.
Examples include indexing machines, assembly systems, packaging equipment, material handling systems, machine tools, and automated production equipment.
10. Main Product Advantages
10.1 Low-Inertia Rotor
The low-inertia rotor design is one of the most important advantages of the MPL family.
Lower rotor inertia allows the servo motor to change speed quickly.
This is useful when the machine requires:
- Fast acceleration.
- Fast deceleration.
- Frequent reversing.
- High-speed indexing.
- Rapid positioning.
- Short machine cycle times.
The motor therefore works well in applications where dynamic response is more important than simply maintaining a constant rotational speed.
10.2 Good Torque-to-Size Ratio
The motor provides approximately 8.25 N·m of continuous stall torque and approximately 20.3 N·m of peak torque in a 130 mm frame.
This gives the motor a useful balance between physical size and torque capability.
For machine builders, this can help keep the servo axis relatively compact while still providing sufficient torque for demanding motion profiles.
10.3 Resolver Feedback
Resolver feedback provides a robust motor position feedback method.
It is particularly attractive in industrial environments where the servo motor may be exposed to electrical noise, vibration, temperature variation, or demanding operating conditions.
The resolver architecture is also useful for applications where a rugged feedback system is preferred over a more complex high-resolution encoder configuration.
10.4 Integrated Holding Brake
The integrated 24 V DC brake is a major advantage for vertical and gravity-loaded applications.
It can help prevent unwanted movement when the servo is disabled, provided that the brake is correctly controlled and sized for the application.
This makes the RK74AA configuration more suitable for vertical positioning systems than an otherwise similar no-brake version.
10.5 Keyless Shaft
The keyless shaft provides flexibility when selecting mechanical couplings.
For machinery designers, this can simplify certain coupling arrangements and eliminate some of the mechanical considerations associated with traditional keyed shafts.
10.6 Compact 130 mm Frame
The 130 mm frame size provides a relatively compact mechanical package for the motor’s torque class.
This is useful in machine designs where cabinet space and mechanical installation space are limited.
10.7 3000 rpm Servo Performance
The 3000 rpm operating class provides a good balance between speed and torque.
It is suitable for many indexing, positioning, conveyor, assembly, and machine-tool applications where extremely high rotational speed is not the primary requirement.
11. Typical Applications
11.1 Automated Assembly Equipment
The MPL-B4530F-RK74AA can be used for servo axes in automated assembly equipment.
Typical movements include:
- Linear positioning.
- Component insertion.
- Rotary indexing.
- Part transfer.
- Tool positioning.
- Fixture positioning.
The motor’s low-inertia design helps the machine execute repeated motion cycles with controlled acceleration and deceleration.
11.2 Packaging Machinery
Packaging machines often require frequent starting, stopping, indexing, and synchronization.
Typical applications include:
- Packaging indexing axes.
- Film handling mechanisms.
- Cutting mechanisms.
- Labeling equipment.
- Carton handling.
- Product positioning.
The 3000 rpm operating class is well suited to many packaging machine axes.
11.3 Material Handling
The integrated brake makes the RK74AA particularly useful in certain material-handling applications.
Examples include:
- Vertical transfer systems.
- Lift mechanisms.
- Automated storage equipment.
- Positioning platforms.
- Vertical conveyors.
- Robotic transfer mechanisms.
When a vertical axis is involved, the brake can provide mechanical holding capability when the servo system is not actively controlling the motor.
11.4 Pick-and-Place Machinery
Pick-and-place systems frequently require fast acceleration and deceleration.
The low-inertia design can help reduce settling time after a movement.
This can improve overall machine cycle time when properly matched with the drive, load inertia, mechanical transmission, and servo tuning.
11.5 Indexing Machines
Indexing applications are one of the natural application areas for low-inertia servo motors.
A typical indexing cycle may involve:
- Rapid acceleration.
- Controlled movement.
- Deceleration.
- Position settling.
- Holding.
- Rapid movement to the next position.
The MPL-B4530F-RK74AA is well suited to this type of operating profile.
11.6 Machine Tools and Auxiliary Axes
The motor can also be used for auxiliary servo axes in machine tools and other precision equipment.
Potential uses include:
- Tool positioning.
- Auxiliary rotary axes.
- Workpiece positioning.
- Automatic fixture adjustment.
- Material feeding.
- Mechanical indexing.
12. Application Advantages
| Application Requirement | MPL-B4530F-RK74AA Advantage |
|---|---|
| Fast acceleration | Low rotor inertia |
| Fast deceleration | Low rotor inertia |
| Repeated indexing | 3000 rpm servo performance |
| Accurate positioning | Resolver feedback |
| Vertical axis holding | Integrated 24 V DC brake |
| Compact installation | 130 mm frame |
| Flexible coupling | Keyless shaft |
| Industrial operation | Brushless servo construction |
| Medium-power motion | Approx. 2.1 kW |
| Short-cycle machinery | High peak torque capability |
13. Mechanical Installation Considerations
When installing the MPL-B4530F-RK74AA, the motor should be mechanically aligned with the driven equipment.
Misalignment between the motor shaft and driven shaft can result in excessive bearing loading, vibration, coupling wear, and reduced service life.
The following should be considered:
- Motor flange alignment.
- Shaft alignment.
- Coupling compatibility.
- Radial shaft load.
- Axial shaft load.
- Load inertia.
- Brake requirements.
- Cable routing.
- Connector clearance.
- Motor cooling.
- Ambient temperature.
The keyless shaft should be matched with a suitable coupling rather than treated as a direct replacement for a keyed shaft without checking the mechanical interface.
14. Brake Application Considerations
The integrated brake should be selected based on the actual load and mechanical arrangement.
For a vertical axis, the brake should be capable of holding the load under the expected static conditions.
The servo drive should normally manage the motor’s motion and deceleration, while the brake provides holding functionality when appropriate.
The brake should not automatically be treated as a high-frequency dynamic stopping device unless the complete system is specifically designed for that duty.
Correct brake timing is also important.
A typical sequence may involve:
- Servo motor actively controls the axis.
- Axis reaches the commanded position.
- Motor torque is controlled to a suitable level.
- Brake is engaged.
- Servo output is disabled when appropriate.
The actual sequence should be determined by the servo control architecture and machine safety requirements.
15. Resolver Feedback Versus Encoder Feedback
The MPL family can be configured with different feedback technologies.
The resolver version is attractive when robustness and industrial reliability are important.
Encoder-based versions can offer higher feedback resolution and additional feedback information depending on the specific configuration.
| Feature | Resolver Configuration | High-Resolution Encoder Configuration |
|---|---|---|
| Feedback Type | Resolver | High-resolution encoder |
| General Characteristics | Rugged and robust | High feedback resolution |
| Environmental Robustness | Strong | Strong, depending on encoder |
| Position Feedback | Suitable for servo control | Suitable for high-precision servo control |
| Typical Selection Priority | Reliability and ruggedness | Resolution and advanced feedback |
| Example | MPL-B4530F-RK74AA | MPL-B4530F-SK74AA |
For applications where extremely fine feedback resolution is not the main requirement, the resolver version can be a practical choice.
16. Five Same-Series or Closely Related Models
The following models are closely related to the MPL-B4530F-RK74AA and are useful when selecting an alternative motor.
| Model | Feedback / Configuration | Speed | Continuous Torque | Peak Torque | Rated Power | Frame | Stack | Weight |
|---|---|---|---|---|---|---|---|---|
| MPL-B4530F-RJ74AA | Resolver, keyed, brake | 3000 rpm | 8.25 N·m | 20.3 N·m | 2.1 kW | 130 mm | 76.2 mm | Approx. 9.5 kg |
| MPL-B4530F-RK72AA | Resolver, keyless, no brake | 3000 rpm | 8.25 N·m | 20.3 N·m | 2.1 kW | 130 mm | 76.2 mm | Approx. 7.3 kg class |
| MPL-B4530F-RK74AA | Resolver, keyless, brake | 3000 rpm | 8.25 N·m | 20.3 N·m | 2.1 kW | 130 mm | 76.2 mm | Approx. 10.9 kg |
| MPL-B4530F-SK74AA | Single-turn high-resolution encoder, keyless, brake | 3000 rpm | 8.25 N·m | 20.3 N·m | 2.1 kW | 130 mm | 76.2 mm | Approx. 10 kg class |
| MPL-B4530F-SJ74AA | Single-turn high-resolution encoder, keyed, brake | 3000 rpm | 8.25 N·m | 20.3 N·m | 2.1 kW | 130 mm | 76.2 mm | Approx. 10 kg class |
The most direct alternatives are the RJ74AA and RK72AA.
The RJ74AA is especially relevant when the machine requires a keyed shaft rather than a keyless shaft.
The RK72AA is the closest configuration when the keyless shaft is required but an integrated brake is not necessary.
The SK74AA and SJ74AA versions are more appropriate when the application requires high-resolution encoder feedback rather than resolver feedback.
17. Five Same-Brand Popular Models
The following models are useful alternatives within the same general Allen-Bradley servo motor family.
| Model | Series / Configuration | Rated Speed | Continuous Torque | Peak Torque | Rated Power | Frame / Size | Weight |
|---|---|---|---|---|---|---|---|
| MPL-B430P-MJ74AA | MPL Low-Inertia, encoder, keyed, brake | 5000 rpm | 6.55 N·m | 19.8 N·m | 2.2 kW | 115 mm class | Approx. 5.5 kg class |
| MPL-B430P-MK74AA | MPL Low-Inertia, multi-turn encoder, keyless, brake | 5000 rpm | 6.55 N·m | 19.8 N·m | 2.2 kW | 115 mm class | Approx. 5.5 kg class |
| MPL-B4530F-MJ74AA | MPL Low-Inertia, encoder, keyed, brake | 3000 rpm | 8.25 N·m | 20.3 N·m | 2.1 kW | 130 mm | Approx. 9.5 kg class |
| MPL-B4540F-MJ74AA | MPL Low-Inertia, encoder, keyed, brake | 3000 rpm | 10.2 N·m | 27.1 N·m | 2.6 kW | 130 mm class | Approx. 8.6 kg class |
| MPL-B4560F-MJ74AA | MPL Low-Inertia, encoder, keyed, brake | 3000 rpm | 14.1 N·m | 34.4 N·m | 3.2 kW | Larger 130 mm-class motor | Approx. 11.82 kg class |
These models cover several practical selection directions.
The MPL-B430P family is useful when higher speed and a smaller motor package are more important.
The MPL-B4530F family is a balanced choice for 3000 rpm applications around the 8.25 N·m continuous torque level.
The MPL-B4540F provides more continuous and peak torque.
The MPL-B4560F moves further upward in torque and power for heavier machine axes.
18. MPL-B4530F-RK74AA Compared with MPL-B4530F-RJ74AA
The two models are extremely similar electrically.
The main mechanical difference is the shaft configuration.
| Parameter | MPL-B4530F-RK74AA | MPL-B4530F-RJ74AA |
|---|---|---|
| Feedback | Resolver | Resolver |
| Rated Speed | 3000 rpm | 3000 rpm |
| Continuous Torque | 8.25 N·m | 8.25 N·m |
| Peak Torque | 20.3 N·m | 20.3 N·m |
| Rated Power | Approx. 2.1 kW | Approx. 2.1 kW |
| Shaft | Keyless | Keyed |
| Brake | 24 V DC | 24 V DC |
| Frame | 130 mm | 130 mm |
| Stack | 76.2 mm | 76.2 mm |
| Approx. Weight | 10.9 kg | Approx. 9.5 kg |
| Best Selection | Keyless coupling systems | Keyed coupling systems |
The main question when choosing between the two is therefore the mechanical shaft interface.
If the machine is designed for a keyless coupling, the RK74AA is the more natural choice.
If the machine uses a conventional keyed coupling, the RJ74AA is more appropriate.
19. MPL-B4530F-RK74AA Compared with MPL-B4530F-RK72AA
These two models share the resolver feedback and keyless shaft configuration.
The major difference is the brake.
| Parameter | MPL-B4530F-RK74AA | MPL-B4530F-RK72AA |
|---|---|---|
| Feedback | Resolver | Resolver |
| Shaft | Keyless | Keyless |
| Rated Speed | 3000 rpm | 3000 rpm |
| Continuous Torque | 8.25 N·m | 8.25 N·m |
| Peak Torque | 20.3 N·m | 20.3 N·m |
| Rated Power | Approx. 2.1 kW | Approx. 2.1 kW |
| Brake | 24 V DC | No brake |
| Frame | 130 mm | 130 mm |
| Stack | 76.2 mm | 76.2 mm |
| Approx. Weight | 10.9 kg | Approx. 7.3 kg class |
| Typical Application | Vertical / brake-required axes | Horizontal / no-brake axes |
For a horizontal axis with no holding requirement, the RK72AA may be sufficient.
For a vertical axis or a machine requiring mechanical holding, the RK74AA offers a significant practical advantage.
20. MPL-B4530F-RK74AA Compared with MPL-B4540F
The MPL-B4540F family provides a higher torque capability.
| Parameter | MPL-B4530F-RK74AA | MPL-B4540F |
|---|---|---|
| Rated Speed | 3000 rpm | 3000 rpm |
| Continuous Torque | 8.25 N·m | 10.2 N·m |
| Peak Torque | 20.3 N·m | 27.1 N·m |
| Rated Power | 2.1 kW | 2.6 kW |
| Rotor Inertia | Approx. 0.00040 kg·m² | Approx. 0.00052 kg·m² |
| Frame Class | 130 mm | 130 mm class |
| Stack Length | 76.2 mm | 101.6 mm class |
| Weight | Approx. 10.9 kg | Approx. 8.6 kg class |
| Feedback | Resolver | Depends on configuration |
| Brake | Yes | Depends on configuration |
If the application is approaching the torque limit of the B4530F motor, moving to the B4540F family can provide additional torque and power capacity.
21. MPL-B4530F-RK74AA Compared with MPL-B430P
The B430P family emphasizes higher speed, while the B4530F provides greater continuous torque.
| Parameter | MPL-B4530F-RK74AA | MPL-B430P |
|---|---|---|
| Rated Speed | 3000 rpm | 5000 rpm |
| Continuous Torque | 8.25 N·m | 6.55 N·m |
| Peak Torque | 20.3 N·m | 19.8 N·m |
| Rated Power | 2.1 kW | 2.2 kW |
| Rotor Inertia | Approx. 0.00040 kg·m² | Approx. 0.00038 kg·m² |
| Frame | 130 mm | 115 mm class |
| Brake | Yes | Depends on configuration |
| Feedback | Resolver | Depends on configuration |
| Approx. Weight | 10.9 kg | Approx. 5.5 kg class |
The B430P can be attractive for higher-speed applications where the lower continuous torque requirement allows a smaller motor.
The B4530F is more appropriate when the machine requires greater continuous torque and a larger torque margin.
22. Why Choose the MPL-B4530F-RK74AA?
There are several reasons why this motor can be a strong choice for an industrial servo axis.
First, the motor provides a useful combination of 8.25 N·m continuous torque and 20.3 N·m peak torque.
Second, the 3000 rpm operating class provides a good balance between speed and torque.
Third, the resolver feedback configuration is well suited to industrial motion systems that value robust feedback.
Fourth, the integrated 24 V DC brake makes the motor suitable for applications where the axis must remain mechanically held.
Fifth, the keyless shaft provides flexibility for compatible coupling systems.
Finally, the low-inertia design helps the motor respond quickly to changes in speed and position commands.
23. Main Advantages at a Glance
| Advantage | Practical Benefit |
|---|---|
| Low-inertia rotor | Faster acceleration and deceleration |
| Resolver feedback | Robust position feedback |
| 3000 rpm rating | Good balance of speed and torque |
| 8.25 N·m continuous torque | Suitable for medium-duty servo axes |
| 20.3 N·m peak torque | Strong transient acceleration capability |
| 2.1 kW output | Useful medium-power range |
| Integrated 24 V brake | Suitable for holding applications |
| Keyless shaft | Flexible coupling arrangement |
| 130 mm frame | Compact industrial package |
| SpeedTEC DIN connector | Practical industrial cable connection |
| IEC metric mounting | Convenient machine integration |
| Low-inertia design | Suitable for repeated motion cycles |
24. Typical Machine Categories
The MPL-B4530F-RK74AA can be considered for many types of automated machinery, including:
Packaging Machines
Servo-controlled indexing, positioning, feeding, cutting, and product-handling axes.
Assembly Machines
Automated insertion, positioning, transfer, and indexing mechanisms.
Material Handling Equipment
Servo-driven conveyors, lifts, positioning systems, and transfer mechanisms.
Pick-and-Place Machines
High-frequency movement and positioning applications where rapid acceleration and settling are important.
Machine Tools
Auxiliary positioning axes, feeding systems, workpiece positioning, and automated mechanisms.
Production Machinery
General industrial motion applications requiring coordinated servo control.
Vertical Motion Systems
Applications where the integrated holding brake provides an additional mechanical holding function.
25. Selection Guide
The following guide can be used as a simple starting point when selecting between closely related configurations.
| Application Requirement | Recommended Direction |
|---|---|
| Resolver feedback required | MPL-B4530F-RK74AA |
| Resolver + keyless shaft + brake | MPL-B4530F-RK74AA |
| Resolver + keyless shaft + no brake | MPL-B4530F-RK72AA |
| Resolver + keyed shaft + brake | MPL-B4530F-RJ74AA |
| Encoder feedback + keyless shaft + brake | MPL-B4530F-SK74AA |
| Encoder feedback + keyed shaft + brake | MPL-B4530F-SJ74AA |
| Higher speed required | MPL-B430P family |
| More torque required | MPL-B4540F or MPL-B4560F family |
26. Important Engineering Considerations
Before replacing another servo motor with the MPL-B4530F-RK74AA, the complete motor and drive combination should be checked.
The following items are particularly important:
Drive compatibility: The servo drive must support the motor’s voltage class and feedback configuration.
Feedback compatibility: Because this motor uses resolver feedback, the drive and feedback interface must be compatible with the resolver system.
Brake control: The 24 V DC brake requires appropriate electrical control and correct timing.
Mechanical coupling: The keyless shaft requires a compatible coupling arrangement.
Load inertia: The machine load inertia should be evaluated against the motor rotor inertia and servo tuning requirements.
Torque requirement: Continuous and peak load torque should remain within the motor’s allowable operating range.
Speed requirement: The machine’s maximum required speed should be compared with the motor’s rated operating range.
Environmental conditions: Temperature, vibration, dust, moisture, and other operating conditions should be considered during final selection.
Cable arrangement: The connector orientation and available machine clearance should be checked before installation.
27. Technical Summary
| Category | MPL-B4530F-RK74AA |
|---|---|
| Brand | Allen-Bradley |
| Series | MP-Series MPL Low-Inertia Servo Motors |
| Type | Brushless AC Rotary Servo Motor |
| Voltage Class | 400 V AC |
| Motor Voltage Class | 460 V AC |
| Rated Speed | 3000 rpm |
| Continuous Stall Torque | 8.25 N·m |
| Peak Stall Torque | 20.3 N·m |
| Rated Output | Approx. 2.1 kW |
| Feedback | Resolver |
| Shaft | Keyless |
| Brake | 24 V DC holding brake |
| Frame Size | 130 mm |
| Magnet Stack | 76.2 mm |
| Mounting | IEC Metric |
| Connector | SpeedTEC DIN |
| Connector Style | Right-angle, rotatable |
| Shaft Seal | No |
| Rotor Inertia | Approx. 0.00040 kg·m² |
| Approx. Weight | 10.9 kg |
| Primary Application | Industrial servo motion control |
| Suitable Motion | Positioning, indexing, acceleration/deceleration, vertical holding |
| General Duty | Medium-power industrial automation |
28. Final Product Description
The Allen-Bradley MPL-B4530F-RK74AA is a 3000 rpm, low-inertia brushless AC servo motor designed for industrial motion-control applications requiring a combination of reliable feedback, controlled positioning, dynamic response, and mechanical holding capability.
Its 130 mm frame, 76.2 mm magnet stack, 8.25 N·m continuous torque, 20.3 N·m peak torque, and approximately 2.1 kW rated output make it a versatile choice for medium-duty servo axes.
The resolver feedback system provides robust motor position information, while the low-inertia rotor supports rapid acceleration and deceleration.
The keyless shaft makes it suitable for compatible friction-locking or clamping couplings, and the integrated 24 V DC holding brake makes the motor especially useful for vertical axes and other applications where the load needs to be mechanically held.
For machines requiring a resolver, keyless shaft, and integrated brake in a 3000 rpm servo motor, the MPL-B4530F-RK74AA is a well-balanced configuration within the MPL low-inertia motor family.
Its strongest practical characteristics are the combination of low rotor inertia, moderate-to-high servo torque, resolver feedback, keyless mechanical design, integrated holding brake, and 130 mm industrial frame size.
This combination makes it suitable for automated assembly, packaging machinery, indexing equipment, material handling, pick-and-place systems, machine-tool auxiliary axes, and many other industrial automation applications where repeatable servo motion is required.