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Allen-Bradley MPL-B4540F-SJ72AA Low-Inertia Servo Motor – Technical Specifications, Applications and Model Selection Guide
1. Product Overview
The Allen-Bradley MPL-B4540F-SJ72AA is a low-inertia AC rotary servo motor from the MPL family of MP-Series servo motors. It is designed for industrial motion-control applications that require accurate positioning, stable speed regulation, fast acceleration and deceleration, and reliable operation in demanding automated machinery.
The motor combines a 130 mm metric frame with a 101.6 mm magnet stack, a rated speed of 3000 rpm, single-turn high-resolution encoder feedback, and a keyed shaft configuration.
Unlike brake-equipped versions of the same motor family, the MPL-B4540F-SJ72AA is supplied without an integral holding brake. This makes it particularly suitable for applications where the motor is not required to mechanically hold a vertical load when power is removed, or where the machine uses another external holding or safety mechanism.
The motor uses a right-angle SpeedTEC DIN connector arrangement. The connector can be rotated through 180°, which gives the machine designer greater freedom when routing motor cables inside compact control cabinets, machine bases, robotic structures and automated production equipment.
The overall design is based on a low-inertia rotor construction. This allows the motor to respond quickly to command changes and makes it well suited to applications involving frequent starts, stops, reversals and positioning cycles.
2. Brand and Series Information
| Item | Specification |
|---|---|
| Brand | Allen-Bradley |
| Product Family | MP-Series |
| Motor Series | MPL Low-Inertia Servo Motors |
| Product Type | AC Rotary Servo Motor |
| Model | MPL-B4540F-SJ72AA |
| Voltage Class | 460 V AC / 480 V AC class |
| Rated Speed | 3000 rpm |
| Feedback | Single-turn high-resolution encoder |
| Shaft Type | Keyed shaft extension |
| Brake | No integral brake |
| Mounting | IEC metric flange mounting |
| Frame Size | 130 mm |
| Magnet Stack | 101.6 mm |
| Connector | SpeedTEC DIN, right-angle, rotatable |
| Typical Duty | Precision industrial motion control |
The MPL series is positioned as a low-inertia servo motor family for applications where dynamic response and positioning performance are more important than simply obtaining high continuous torque from a large motor.
3. Detailed Technical Parameters
Electrical and Performance Specifications
| Parameter | Specification |
|---|---|
| Model | MPL-B4540F-SJ72AA |
| Motor Type | Brushless AC permanent-magnet servo motor |
| Voltage Class | 460 V AC |
| Supply Class | 480 V AC class |
| Rated Speed | 3000 rpm |
| Maximum Speed | 3000 rpm |
| Continuous Stall Torque | 10.2 N·m |
| Peak Stall Torque | 27.1 N·m |
| Rated Continuous Output | 2.6 kW |
| Feedback Type | Single-turn high-resolution encoder |
| Feedback Resolution | 1024 cycles/revolution, Sin/Cos type |
| Feedback Protocol | Hiperface-type feedback |
| Rotor Inertia | Approx. 0.00052 kg·m² |
| Brake | None |
| Shaft | Keyed |
| Shaft Seal | No standard shaft seal |
| Motor Connector | SpeedTEC DIN |
| Connector Orientation | Right-angle |
| Connector Rotation | 180° rotatable |
| Motor Mounting | IEC metric flange |
| Frame | 130 mm |
| Magnet Stack Length | 101.6 mm |
| Operating Temperature | Approximately 0 to 40 °C |
| Duty | S1 continuous-duty class |
| Motor Construction | Low-inertia design |
The 10.2 N·m continuous torque rating provides a useful balance between motor size and continuous mechanical output. The 27.1 N·m peak torque capability provides additional short-duration torque capacity for acceleration, deceleration and transient load conditions.
The 2.6 kW continuous output rating places this motor in a useful range for medium-duty automated machinery. It is substantially more capable than the smaller MPL motor sizes while remaining considerably more compact than high-torque industrial servo motors.
4. Mechanical Dimensions and Weight
| Mechanical Parameter | Specification |
|---|---|
| Model | MPL-B4540F-SJ72AA |
| IEC Frame Size | 130 mm |
| Frame Diameter/Class | 130 mm class |
| Magnet Stack Length | 101.6 mm |
| Nominal Stack | 4.0 in. |
| Mounting Standard | IEC metric flange |
| Mounting Hole Type | Free mounting holes, Type FF |
| Shaft Configuration | Keyed shaft extension |
| Shaft Seal | None as standard |
| Connector Type | SpeedTEC DIN |
| Connector Position | Right-angle |
| Connector Rotation | 180° |
| Approx. Motor Weight | 8.6 kg |
| Approx. Weight in Pounds | 19 lb |
| Overall Machine Envelope | Depends on mounting, connector orientation and shaft configuration |
The 130 mm frame size and 101.6 mm magnet stack length are the most important dimensional values when checking mechanical compatibility.
For equipment layout, the complete installation envelope should also account for the shaft coupling, motor mounting flange, cable connector, connector bend radius and cable routing space.
The approximately 8.6 kg motor weight makes the unit suitable for many machine axes where motor mass is important, while still providing substantially higher torque capability than smaller frame motors.
5. Model Number Explanation
The model designation MPL-B4540F-SJ72AA contains several important configuration identifiers.
| Model Section | Meaning |
|---|---|
| MPL | MPL low-inertia servo motor family |
| B | 460 V class motor configuration |
| 45 | 130 mm frame size |
| 40 | 101.6 mm magnet stack |
| F | 3000 rpm speed class |
| S | Single-turn high-resolution encoder |
| J | Keyed shaft extension |
| 7 | SpeedTEC DIN right-angle connector, rotatable |
| 2 | No integral brake |
| AA | Product configuration/revision designation |
This configuration makes the model especially easy to distinguish from the otherwise similar B4540F motors that use resolver feedback, multi-turn absolute feedback, keyless shafts or integral brakes.
6. Product Introduction
The MPL-B4540F-SJ72AA is designed for servo systems in which precise motion, rapid response and repeatable positioning are required.
Its low-inertia construction reduces the amount of rotational energy that must be accelerated and decelerated during a motion cycle. This characteristic is particularly valuable in machines with frequent indexing operations or high-speed positioning sequences.
The 3000 rpm operating class provides a practical compromise between speed and torque. The motor can deliver 10.2 N·m of continuous stall torque and up to approximately 27.1 N·m of peak torque, giving the machine designer useful torque reserve during dynamic motion.
The single-turn high-resolution encoder provides feedback for closed-loop servo control. The controller can use the feedback signal to continuously monitor motor position and speed and correct deviations between commanded and actual motion.
The keyed shaft provides a conventional mechanical connection for applications using keyed couplings, pulleys, gears or other mechanical transmission components.
The absence of an integral brake simplifies the motor configuration and can reduce motor mass compared with brake-equipped versions. For horizontal axes or applications where mechanical holding is not required, this can be an attractive configuration.
7. Main Product Advantages
7.1 Low-Inertia Rotor Design
One of the main advantages of the MPL-B4540F-SJ72AA is its low-inertia construction.
Low rotor inertia allows the servo system to accelerate and decelerate the motor more quickly. It also helps reduce the energy required to change motor speed during repeated motion cycles.
This characteristic is particularly useful in indexing machinery, packaging equipment, electronic assembly equipment, printing machinery, material-handling systems and other machines that repeatedly change position.
7.2 3000 rpm Operating Class
The 3000 rpm rated speed provides a useful combination of rotational speed and torque.
A 3000 rpm motor can support relatively fast mechanical movement without moving into the more specialized high-speed range of smaller servo motors.
For applications requiring high throughput but still needing substantial continuous torque, the B4540F motor family provides a practical middle ground.
7.3 10.2 N·m Continuous Torque
The continuous stall torque is approximately 10.2 N·m.
This gives the motor sufficient continuous torque capability for many medium-duty servo axes.
When properly matched with the drive, transmission ratio and mechanical load, the motor can provide stable torque output over repeated machine cycles.
7.4 27.1 N·m Peak Torque
The peak torque capability is approximately 27.1 N·m.
Peak torque is important during acceleration, deceleration and rapid changes in mechanical load.
The relatively high peak-to-continuous torque ratio gives the motor useful dynamic capability without requiring a significantly larger motor for every short-duration load event.
7.5 High-Resolution Single-Turn Feedback
The motor incorporates a single-turn high-resolution encoder.
This provides closed-loop feedback for position, speed and motion control.
The encoder configuration is well suited to servo applications requiring repeatable positioning and controlled acceleration and deceleration.
For applications where absolute multi-turn position information is required after power cycling, a multi-turn MPL configuration may be more appropriate.
7.6 Keyed Shaft Configuration
The J configuration identifies the keyed shaft extension.
A keyed shaft is a conventional and widely used mechanical interface. It can simplify the selection of compatible couplings, pulleys, gears and other mechanical transmission components.
The keyed shaft is particularly useful in machinery where a positive mechanical connection is preferred over a keyless shaft arrangement.
7.7 No Integral Brake
The 2 portion of the model designation indicates that the motor does not include an integral brake.
This configuration is well suited to horizontal machine axes and other applications where the motor does not need to mechanically hold the load after servo power is removed.
Eliminating the brake can also reduce the motor’s mechanical complexity and weight.
For vertical axes or applications where a load could move under gravity after power is removed, a brake-equipped configuration should normally be considered.
7.8 Flexible Connector Arrangement
The motor uses a SpeedTEC DIN right-angle connector.
The connector can be rotated through 180°, allowing the cable exit direction to be adjusted to suit the machine structure.
This is particularly useful where the motor is mounted in a restricted space or where the motor cable must follow a specific cable tray or drag-chain route.
8. Typical Applications
The MPL-B4540F-SJ72AA can be used in a wide range of industrial servo applications.
| Application | Typical Requirement | Suitability |
|---|---|---|
| Packaging machinery | Fast indexing and positioning | Excellent |
| Conveyor positioning | Speed and position control | Excellent |
| Material handling | Repeated acceleration/deceleration | Excellent |
| Assembly machines | Accurate positioning | Excellent |
| Pick-and-place equipment | Dynamic response | Excellent |
| Printing equipment | Speed synchronization | Very Good |
| Labeling machines | High repeatability | Excellent |
| Machine tools | Servo positioning | Very Good |
| Automated inspection systems | Controlled positioning | Excellent |
| Semiconductor-related equipment | Precise motion | Very Good |
| Winding machinery | Speed/torque regulation | Good |
| General factory automation | Closed-loop motion | Excellent |
9. Packaging Machinery
Packaging equipment frequently requires rapid indexing, positioning and reversing.
The low-inertia construction of the MPL-B4540F-SJ72AA is well suited to this type of machine.
Typical applications include carton handling, bagging systems, filling machinery, labeling systems, cutting mechanisms and indexing conveyors.
The absence of an integral brake is generally suitable for horizontal packaging axes where the load does not require mechanical holding.
10. Material Handling and Conveyor Systems
The motor can be used for controlled conveyor positioning, indexing and transfer mechanisms.
The 10.2 N·m continuous torque capability provides useful torque for medium-duty positioning axes.
Where a conveyor requires frequent starts and stops, the low-inertia motor design can help the servo system respond rapidly to motion commands.
11. Pick-and-Place and Assembly Equipment
High-speed assembly systems often require a motor to move quickly between positions and then stop accurately.
The combination of low rotor inertia, high-resolution feedback and 3000 rpm operation makes this motor suitable for these types of applications.
The motor can also be used with gearboxes or belt-drive mechanisms when additional torque multiplication or mechanical positioning flexibility is required.
12. Printing and Web-Handling Machinery
Servo motors used in printing and web-handling equipment often require accurate speed regulation and synchronization.
The encoder feedback of the MPL-B4540F-SJ72AA allows the control system to monitor motor movement and make corrections as required.
For applications where multiple axes must maintain synchronized movement, the motor can provide a suitable foundation for coordinated motion control.
13. Machine Tool Applications
The motor can be considered for auxiliary machine-tool axes, positioning mechanisms, indexing systems and other applications requiring repeatable servo motion.
For a machine-tool application, the final motor selection should be based on actual load inertia, acceleration requirements, transmission ratio, duty cycle and peak torque demand.
14. Advantages Compared with a Conventional Industrial Motor
The MPL-B4540F-SJ72AA offers several advantages over a conventional induction motor when precise servo motion is required.
A conventional motor may provide reliable continuous rotation but does not inherently provide the same level of closed-loop position control.
The servo motor combines the motor, feedback device and servo-drive control system into a coordinated motion-control solution.
This makes it possible to control position, velocity and acceleration much more accurately.
15. Advantages of the No-Brake Configuration
The no-brake configuration is not simply a cost-related option. It can be an engineering advantage when a brake is unnecessary.
For a horizontal axis, for example, the motor may not need to mechanically hold the load when the servo drive is disabled.
In such applications, the no-brake motor can provide a simpler mechanical configuration and lower motor weight.
However, the selection should always consider what happens when servo power is removed.
For vertical axes, suspended loads, lifting mechanisms and safety-critical holding applications, a brake-equipped motor or a separate mechanical holding system may be required.
16. Mechanical Integration
The 130 mm frame size should be checked against the machine’s motor mounting plate and flange interface.
The 101.6 mm magnet stack determines the active motor body length and is an important consideration when comparing different MPL motor sizes.
The keyed shaft should be matched with a suitable coupling or mechanical transmission component.
The connector orientation should also be considered during machine design. Because the SpeedTEC DIN connector is right-angle and rotatable, cable routing can generally be optimized without changing the fundamental motor mounting position.
Adequate clearance should be provided around the connector, shaft and motor body.
17. Electrical Integration
The motor is designed around the 460 V AC voltage class and is normally used as part of a coordinated servo drive system.
The servo drive must be selected to match the motor’s electrical characteristics, feedback type and required performance.
The single-turn high-resolution encoder configuration is an important selection point.
A drive configured for a different feedback technology should not be assumed to be directly compatible simply because the motor frame and torque ratings are similar.
18. Servo Drive Compatibility
The MPL family has historically been used with several servo-drive platforms.
Depending on the machine generation and control architecture, compatible drive families can include Kinetix and other servo-drive platforms designed for the appropriate MPL feedback and voltage configuration.
The actual drive selection should be based on the exact machine architecture, feedback interface, voltage class, motor current requirements and required control functions.
19. Important Engineering Considerations
When selecting the MPL-B4540F-SJ72AA, several factors should be checked.
Load Torque
The continuous load torque should remain within the motor’s continuous torque capability under the actual duty cycle.
The 10.2 N·m continuous rating should not be treated as a target operating point for every application. A suitable engineering margin should be maintained.
Peak Torque
The 27.1 N·m peak rating is intended for short-duration dynamic requirements.
The duration and frequency of peak-torque events must be considered when calculating motor thermal performance.
Load Inertia
The motor’s low rotor inertia is beneficial for fast response, but the external load inertia must also be considered.
A large mismatch between motor inertia and reflected load inertia can affect servo tuning and dynamic performance.
Acceleration
High acceleration requires higher peak torque.
If the machine needs extremely aggressive acceleration or deceleration, the torque requirement should be calculated from the actual mechanical load rather than selected only from the nominal motor rating.
Brake Requirement
Because this model has no integral brake, it should be carefully evaluated for vertical or gravity-loaded applications.
Operating Environment
Temperature, dust, moisture, washdown requirements, vibration and cable routing should all be evaluated before final selection.
20. Recommended Related Models
The following models are closely related to the B4540F family and are useful alternatives when selecting a motor with similar mechanical characteristics or when a different feedback, shaft or brake configuration is required.
| Model | Speed | Continuous Torque | Peak Torque | Rated Power | Feedback | Shaft | Brake | Frame / Stack | Approx. Weight |
|---|---|---|---|---|---|---|---|---|---|
| MPL-B4540F-SJ72AA | 3000 rpm | 10.2 N·m | 27.1 N·m | 2.6 kW | Single-turn high-resolution | Keyed | No | 130 / 101.6 mm | 8.6 kg |
| MPL-B4540F-SJ74AA | 3000 rpm | 10.2 N·m | 27.1 N·m | 2.6 kW | Single-turn high-resolution | Keyed | 24 V DC | 130 / 101.6 mm | Approx. 13 kg |
| MPL-B4540F-SK72AA | 3000 rpm | 10.2 N·m | 27.1 N·m | 2.6 kW | Single-turn high-resolution | Keyless | No | 130 / 101.6 mm | Approx. 8.6 kg class |
| MPL-B4540F-SK74AA | 3000 rpm | 10.2 N·m | 27.1 N·m | 2.6 kW | Single-turn high-resolution | Keyless | 24 V DC | 130 / 101.6 mm | Approx. 12–13 kg |
| MPL-B4560F-SJ72AA | 3000 rpm | 14.1 N·m | 34.4 N·m | 3.2 kW | Single-turn high-resolution | Keyed | No | 130 / 152.4 mm | Approx. 11.8 kg |
The MPL-B4540F-SJ74AA is the most direct alternative when the application needs an integral 24 V DC holding brake.
The MPL-B4540F-SK72AA is a useful alternative when a keyless shaft is preferred.
The MPL-B4540F-SK74AA combines a keyless shaft with a brake.
The MPL-B4560F-SJ72AA is a stronger alternative when the B4540F’s 10.2 N·m continuous torque is not sufficient and the application requires approximately 14.1 N·m continuous torque.
21. Five Related Models – Selection Comparison
| Model | Main Difference | Continuous Torque | Speed | Feedback | Brake | Dimensions | Weight |
|---|---|---|---|---|---|---|---|
| MPL-B4540F-SJ72AA | Reference model | 10.2 N·m | 3000 rpm | Single-turn high-resolution | No | 130 mm frame × 101.6 mm stack | 8.6 kg |
| MPL-B4540F-SJ74AA | Adds holding brake | 10.2 N·m | 3000 rpm | Single-turn high-resolution | 24 V DC | 130 mm × 101.6 mm | Approx. 13 kg |
| MPL-B4540F-SK72AA | Keyless shaft | 10.2 N·m | 3000 rpm | Single-turn high-resolution | No | 130 mm × 101.6 mm | Approx. 8.6 kg |
| MPL-B4540F-SK74AA | Keyless + brake | 10.2 N·m | 3000 rpm | Single-turn high-resolution | 24 V DC | 130 mm × 101.6 mm | Approx. 12–13 kg |
| MPL-B4560F-SJ72AA | Higher torque / longer stack | 14.1 N·m | 3000 rpm | Single-turn high-resolution | No | 130 mm × 152.4 mm | Approx. 11.8 kg |
22. Five Popular Same-Brand Models
The following models are useful reference points within the same brand’s servo motor range. They cover different feedback technologies, motor sizes, speeds and torque levels.
| Model | Speed | Continuous Torque | Peak Torque | Rated Power | Feedback | Shaft | Brake | Dimensions | Approx. Weight |
|---|---|---|---|---|---|---|---|---|---|
| MPL-B4540F-MJ74AA | 3000 rpm | 10.2 N·m | 27.1 N·m | 2.6 kW | Multi-turn absolute | Keyed | 24 V DC | 130 × 101.6 mm | Approx. 10–11 kg |
| MPL-B4540F-MK74AA | 3000 rpm | 10.2 N·m | 27.1 N·m | 2.6 kW | Multi-turn absolute | Keyless | 24 V DC | 130 × 101.6 mm | Approx. 10–12 kg |
| MPL-B4540F-HJ74AA | 3000 rpm | 10.2 N·m | 27.1 N·m | 2.6 kW | High-resolution incremental | Keyed | 24 V DC | 130 × 101.6 mm | Approx. 11 kg class |
| MPL-B4560F-MJ74AA | 3000 rpm | 14.1 N·m | 34.4 N·m | 3.2 kW | Multi-turn absolute | Keyed | 24 V DC | 130 × 152.4 mm | Approx. 12–13 kg |
| MPL-B540K-MJ74AA | 4000 rpm | 19.4 N·m | 48.6 N·m | 5.4 kW | Multi-turn absolute | Keyed | 24 V DC | Approx. 165 mm frame × 101.6 mm stack class | Approx. 15 kg |
These models are useful when the application requires a different feedback architecture, higher torque, higher speed, a holding brake or multi-turn position information.
23. MPL-B4540F-SJ72AA vs MPL-B4540F-SJ74AA
These two models are mechanically very similar.
The major difference is the brake configuration.
The MPL-B4540F-SJ72AA has no integral brake, while the MPL-B4540F-SJ74AA includes a 24 V DC brake.
| Parameter | MPL-B4540F-SJ72AA | MPL-B4540F-SJ74AA |
|---|---|---|
| Speed | 3000 rpm | 3000 rpm |
| Continuous Torque | 10.2 N·m | 10.2 N·m |
| Peak Torque | 27.1 N·m | 27.1 N·m |
| Power | 2.6 kW | 2.6 kW |
| Feedback | Single-turn high-resolution | Single-turn high-resolution |
| Shaft | Keyed | Keyed |
| Brake | None | 24 V DC |
| Frame | 130 mm | 130 mm |
| Stack | 101.6 mm | 101.6 mm |
| Weight | Approx. 8.6 kg | Approx. 13 kg |
For a horizontal positioning axis, the SJ72AA can be the more straightforward selection.
For a vertical axis or an application where the load must remain mechanically held when servo power is removed, the SJ74AA is generally the more appropriate configuration.
24. MPL-B4540F-SJ72AA vs MPL-B4540F-SK72AA
The major difference between these models is the shaft.
| Parameter | MPL-B4540F-SJ72AA | MPL-B4540F-SK72AA |
|---|---|---|
| Speed | 3000 rpm | 3000 rpm |
| Continuous Torque | 10.2 N·m | 10.2 N·m |
| Peak Torque | 27.1 N·m | 27.1 N·m |
| Power | 2.6 kW | 2.6 kW |
| Feedback | Single-turn high-resolution | Single-turn high-resolution |
| Shaft | Keyed | Keyless |
| Brake | No | No |
| Frame | 130 mm | 130 mm |
| Stack | 101.6 mm | 101.6 mm |
| Weight | Approx. 8.6 kg | Approx. 8.6 kg class |
The keyed-shaft version is appropriate when the machine’s transmission system is designed around a conventional key connection.
The keyless version can be attractive when a clamping hub or other keyless coupling system is preferred.
25. MPL-B4540F-SJ72AA vs MPL-B4560F-SJ72AA
The B4560F provides higher torque by using a longer magnet stack.
| Parameter | MPL-B4540F-SJ72AA | MPL-B4560F-SJ72AA |
|---|---|---|
| Speed | 3000 rpm | 3000 rpm |
| Continuous Torque | 10.2 N·m | 14.1 N·m |
| Peak Torque | 27.1 N·m | 34.4 N·m |
| Rated Power | 2.6 kW | 3.2 kW |
| Frame | 130 mm | 130 mm |
| Stack | 101.6 mm | 152.4 mm |
| Feedback | Single-turn high-resolution | Single-turn high-resolution |
| Shaft | Keyed | Keyed |
| Brake | No | No |
| Approx. Weight | 8.6 kg | 11.8 kg |
If the application can physically accommodate the longer motor and needs more continuous torque, the B4560F is a natural step upward within the same family.
26. Application Selection Guide
| Machine Requirement | Recommended Configuration |
|---|---|
| Horizontal positioning axis | MPL-B4540F-SJ72AA |
| High-speed indexing | MPL-B4540F-SJ72AA |
| Keyed coupling required | MPL-B4540F-SJ72AA |
| Keyless coupling required | MPL-B4540F-SK72AA |
| Vertical axis | MPL-B4540F-SJ74AA |
| Vertical axis with keyless coupling | MPL-B4540F-SK74AA |
| More than 10.2 N·m continuous torque | MPL-B4560F-SJ72AA |
| Multi-turn absolute positioning | MPL-B4540F-MJ74AA / MK74AA |
| Higher torque and higher power | MPL-B540K-MJ74AA |
27. Advantages for Automated Production Lines
For automated production equipment, the MPL-B4540F-SJ72AA provides several useful characteristics.
The motor has a relatively compact 130 mm frame while delivering 10.2 N·m of continuous torque.
Its 3000 rpm operating speed supports rapid machine cycles.
The low-inertia construction helps reduce response time during acceleration and deceleration.
The high-resolution feedback system allows the controller to maintain accurate closed-loop motion.
The right-angle rotating connector can simplify cable routing.
The keyed shaft provides a familiar mechanical interface.
The no-brake configuration keeps the motor focused on applications where a holding brake is not required.
28. Advantages for High-Cycle Machinery
Machines with a high number of motion cycles per hour can benefit from the motor’s dynamic characteristics.
Frequent acceleration and deceleration can place significant demands on a servo motor.
A low-inertia rotor can reduce the torque required to change the motor’s own rotational speed, leaving more of the available motor torque available for the actual machine load.
This can be particularly beneficial in indexing, pick-and-place, packaging and assembly equipment.
29. Advantages for Machine Designers
From a machine-design perspective, the motor’s 130 mm frame and 101.6 mm stack provide a standardized physical platform that can be compared with other MPL motor configurations.
The same general motor family offers multiple shaft, feedback and brake options.
This allows a machine platform to use different motor configurations without completely changing its basic servo motor architecture.
The 180° rotatable connector is another practical advantage because it provides additional flexibility during mechanical integration.
30. Recommended Use Conditions
The motor is best suited to applications where:
- Precise servo positioning is required.
- Fast acceleration and deceleration are required.
- The machine operates around the 3000 rpm speed range.
- Continuous torque requirements are around the 10 N·m class.
- Short-duration peak torque requirements can reach approximately 27 N·m.
- A keyed shaft is preferred.
- A holding brake is not required.
- Single-turn high-resolution feedback is suitable.
- A 130 mm metric flange is compatible with the machine structure.
- The application benefits from a low-inertia motor.
31. Applications Where Another Configuration May Be Better
Although the MPL-B4540F-SJ72AA is a versatile servo motor, it is not the ideal configuration for every machine.
A vertical lifting axis may require the brake-equipped MPL-B4540F-SJ74AA.
A keyless mechanical transmission may favor the MPL-B4540F-SK72AA.
A machine requiring multi-turn absolute feedback may be better served by an M-series configuration.
An application requiring substantially more continuous torque may require a B4560F or larger motor.
An extremely high-speed application may be better matched to a higher-speed MPL family member.
32. Overall Product Evaluation
The Allen-Bradley MPL-B4540F-SJ72AA is a well-balanced 3000 rpm low-inertia servo motor for medium-duty industrial motion control.
Its 10.2 N·m continuous torque, approximately 27.1 N·m peak torque and 2.6 kW continuous output make it suitable for a broad range of automated machinery.
The 130 mm frame and 101.6 mm stack provide a practical mechanical package, while the approximately 8.6 kg motor weight keeps the axis relatively manageable from a mechanical design perspective.
The single-turn high-resolution encoder provides the feedback required for accurate closed-loop servo control.
The keyed shaft is convenient for conventional mechanical transmission designs.
The SpeedTEC DIN right-angle connector, with 180° rotational adjustment, provides useful installation flexibility.
The absence of an integral brake makes this model especially attractive for horizontal axes and other applications where mechanical load holding is not required.
For applications that need the same basic motor performance but require a brake, keyless shaft, multi-turn feedback or higher torque, the wider MPL family provides several closely related alternatives.
33. Key Specifications at a Glance
| Key Parameter | MPL-B4540F-SJ72AA |
|---|---|
| Brand | Allen-Bradley |
| Series | MPL Low-Inertia Servo Motors |
| Product Family | MP-Series |
| Motor Type | AC Rotary Servo Motor |
| Voltage Class | 460 V AC |
| Rated Speed | 3000 rpm |
| Continuous Torque | 10.2 N·m |
| Peak Torque | 27.1 N·m |
| Rated Power | 2.6 kW |
| Feedback | Single-turn high-resolution encoder |
| Shaft | Keyed |
| Brake | No integral brake |
| Frame Size | 130 mm |
| Magnet Stack | 101.6 mm |
| Approx. Weight | 8.6 kg |
| Connector | SpeedTEC DIN, right-angle |
| Connector Adjustment | 180° rotatable |
| Mounting | IEC metric flange |
| Operating Temperature | Approximately 0 to 40 °C |
| Rotor Inertia | Approx. 0.00052 kg·m² |
| Typical Application | Industrial servo motion control |
34. Final Selection Summary
The MPL-B4540F-SJ72AA is a strong choice when the application requires a 3000 rpm servo motor with approximately 10.2 N·m continuous torque, high-resolution single-turn feedback, a keyed shaft and no integral brake.
Its main strengths are the low-inertia rotor, 2.6 kW output class, high peak torque capability, 130 mm metric frame, compact 101.6 mm stack, high-resolution feedback and flexible connector arrangement.
For a brake-equipped version, the MPL-B4540F-SJ74AA is the closest alternative.
For a keyless shaft, the MPL-B4540F-SK72AA is the more suitable choice.
For both keyless operation and a holding brake, the MPL-B4540F-SK74AA is a practical alternative.
For higher continuous torque while remaining in the same general 130 mm motor family, the MPL-B4560F-SJ72AA provides a step up in torque and power.
For applications requiring multi-turn absolute feedback, the M-series versions provide a different feedback architecture while maintaining a similar overall servo motor platform.
Overall, the MPL-B4540F-SJ72AA is best characterized as a 130 mm-frame, 3000 rpm, 2.6 kW-class, low-inertia servo motor with 10.2 N·m continuous torque, 27.1 N·m peak torque, single-turn high-resolution feedback, keyed shaft and no integral brake. It is particularly well suited to high-cycle automated machinery, indexing systems, packaging equipment, assembly equipment, material handling and other industrial applications requiring accurate and responsive servo motion.