1. Product Overview

The MPL-A4540C-SK72AA is a low-inertia brushless AC servo motor belonging to the MP-Series MPL servo motor family. It is designed for motion-control systems that require accurate positioning, stable speed control, fast acceleration and deceleration, and reliable repeated operation.

The model is built around a 230/240 V-class servo motor platform, with a 130 mm frame size, 101.6 mm magnet stack length, 1500 rpm rated speed, and a continuous stall torque of approximately 10.2 N·m. The motor uses a high-resolution absolute feedback system and a SpeedTEC DIN connector arrangement.

One of the important characteristics of this particular model is the keyless shaft extension. This makes it different from closely related keyed-shaft versions in the same MPL family and should be taken into account when selecting couplings, pulleys, gearboxes, or other mechanical transmission components.

The motor is supplied without a mechanical brake. Its right-angle connector arrangement can be rotated, which provides additional flexibility when the motor is installed in equipment with limited cable-routing space.

The MPL-A4540C-SK72AA is therefore particularly suitable for industrial machinery where compact servo construction, relatively low rotor inertia, accurate feedback, and controlled dynamic response are important.

2. Basic Product Information

3. Model Number Explanation

The model number MPL-A4540C-SK72AA contains information relating to the motor family, frame configuration, speed class, feedback arrangement, shaft configuration and connector/feedback options.

A simplified interpretation is as follows:

The exact meaning of individual ordering-code characters should always be interpreted together rather than separately, because some characters represent a particular combination of mechanical and electrical options.

4. Main Technical Parameters

The MPL-A4540C-SK72AA is positioned in the medium-size low-inertia servo category. Its 1500 rpm rating makes it particularly appropriate for applications where torque and controlled motion are more important than extremely high rotational speed.

The motor has a continuous stall torque of approximately 10.2 N·m, while its peak stall torque reaches approximately 27.1 N·m. This difference is important in applications involving acceleration, deceleration, intermittent loading, indexing and short-duration torque peaks.

5. Product Dimensions

For this motor, it is important to distinguish between the frame size, magnet stack length, and the motor’s complete external dimensions.

The commonly specified frame dimension is 130 mm, corresponding to the motor’s 45 frame designation. The magnet stack length is 101.6 mm, equivalent to 4.0 inches.

The complete motor envelope also includes the end housing, shaft extension, connector section and mounting flange. Therefore, the 130 mm and 101.6 mm figures should not be interpreted as the overall length and width of the complete motor.

For equipment design, the complete mechanical drawing should be used for final cabinet, machine-frame and coupling clearance calculations. The frame and stack figures alone should not be used to manufacture a mounting bracket.

6. Encoder and Feedback System

The MPL-A4540C-SK72AA uses a high-resolution absolute single-turn feedback arrangement.

The feedback is based on a 1024 Sin/Cos signal configuration using the Hiperface protocol. This provides the servo system with information concerning motor position and rotational behavior.

The single-turn configuration is particularly useful for machines in which the controller needs precise angular information within one revolution, while the overall machine control system manages the machine’s larger-scale position requirements.

Compared with a basic incremental feedback system, an absolute feedback arrangement can provide more useful positional information during startup and motion-control operation.

This makes the motor appropriate for applications such as:

• Precision positioning equipment
• Packaging machinery
• Material handling systems
• Automated assembly machinery
• Machine tools
• Indexing equipment
• Printing machinery
• Converting equipment
• Pick-and-place mechanisms
• Automated production lines

7. Keyless Shaft Design

One of the defining mechanical features of the MPL-A4540C-SK72AA is its keyless shaft extension.

A keyless shaft can be advantageous when the motor is connected through an appropriate coupling or other compatible transmission component. It eliminates the need for a conventional shaft key and can provide a clean mechanical interface.

However, this also means that the machine designer needs to select the correct coupling or transmission component.

When replacing an existing servo motor with this model, it is important not to assume that a keyed coupling will be directly compatible.

The following should be checked:

1. Shaft diameter.
2. Shaft length.
3. Coupling bore.
4. Coupling clamping method.
5. Axial clearance.
6. Radial loading.
7. Maximum permissible shaft load.
8. Motor flange dimensions.
9. Motor-to-machine mounting pattern.
10. Encoder and connector clearance.

8. No-Brake Configuration

The MPL-A4540C-SK72AA is supplied in a no-brake configuration.

This is suitable for many horizontal-axis applications where the machine does not need the motor to mechanically hold a load when electrical power is removed.

Typical examples include:

• Conveyor drives.
• Rotary positioning mechanisms.
• Horizontal indexing systems.
• Packaging mechanisms.
• General machine automation.

For vertical-axis applications, however, the absence of a motor brake requires particular attention. A servo motor’s electromagnetic torque should not automatically be treated as a mechanical holding brake when power is removed.

If the application involves a suspended load or a vertical axis, an appropriate external load-holding solution or a brake-equipped motor configuration may be required.

9. Product Introduction

The MPL-A4540C-SK72AA is intended for industrial motion applications requiring a combination of servo accuracy, relatively high torque density and low rotor inertia.

The low-inertia design allows the motor to respond rapidly to commands from the servo drive. This characteristic is useful in systems where the load repeatedly accelerates and decelerates.

The 1500 rpm rating provides a relatively torque-oriented operating profile compared with higher-speed members of the same family.

In practical machine design, the motor can be paired with an appropriate servo drive and controller to create a complete closed-loop motion system.

The drive receives position and speed feedback from the motor encoder and adjusts current and torque accordingly. This closed-loop operation enables controlled acceleration, speed regulation and positioning.

The motor’s 130 mm frame size provides a useful compromise between physical size and torque capability, while the 101.6 mm magnet stack provides the electromagnetic active length associated with this configuration.

10. Product Applications

10.1 Packaging Machinery

The motor can be used in packaging equipment where accurate synchronization is required.

Typical applications include:

• Film feeding.
• Cutting mechanisms.
• Sealing mechanisms.
• Product indexing.
• Label positioning.
• Carton handling.
• Conveyor synchronization.

The low-inertia motor structure is useful when the machine repeatedly changes speed during a production cycle.

10.2 Material Handling

Servo motors in this size class can be used in automated material-handling machinery.

Applications may include:

• Transfer systems.
• Automated conveyors.
• Indexing tables.
• Positioning mechanisms.
• Pick-and-place systems.
• Automated sorting equipment.

Precise feedback allows the controller to maintain the commanded motion profile.

10.3 Machine Tools

The motor can also be used in machine-tool-related motion applications where controlled rotational movement is required.

Potential uses include:

• Axis positioning.
• Rotary mechanisms.
• Automated tool movement.
• Feed mechanisms.
• Indexing units.

Actual suitability depends on the required speed, torque, inertia ratio, duty cycle and mechanical load.

10.4 Printing and Converting Equipment

Printing and converting machinery often requires coordinated movement between multiple mechanical sections.

The servo motor’s closed-loop feedback and controlled acceleration characteristics can be useful for:

• Web handling.
• Roller positioning.
• Feed control.
• Cutting.
• Registration.
• Indexing.

These applications can benefit from repeatable servo positioning and speed control.

10.5 Automated Assembly

Automated assembly equipment frequently requires precise positioning rather than simply continuous rotation.

The motor can be applied to:

• Component positioning.
• Rotary indexing.
• Assembly stations.
• Transfer mechanisms.
• Screw-driving mechanisms.
• Automated tooling.

11. Main Advantages

11.1 Low-Inertia Rotor Design

The low-inertia configuration is one of the most important characteristics of the MPL family.

Lower rotor inertia can allow the servo system to accelerate and decelerate the motor more efficiently, particularly when the machine has been designed around an appropriate motor-to-load inertia relationship.

This can be valuable in high-cycle machinery.

11.2 High Torque Capability

With approximately 10.2 N·m continuous stall torque and approximately 27.1 N·m peak stall torque, the motor provides a substantial torque range for its frame class.

The peak torque capability is particularly useful during short acceleration and deceleration periods.

11.3 High-Resolution Feedback

The absolute single-turn feedback system provides the control system with detailed motor-position information.

This supports:

• Accurate positioning.
• Stable speed control.
• Repeatable indexing.
• Controlled acceleration.
• Closed-loop torque regulation.

11.4 Compact Industrial Servo Construction

The 130 mm frame and 101.6 mm magnet stack provide a relatively compact industrial servo package while maintaining a useful torque rating.

This can simplify integration into machines where available installation space is limited.

11.5 Flexible Connector Orientation

The right-angle SpeedTEC DIN connector can be rotated through a specified range.

This can be useful when cable routing is constrained by:

• Machine guards.
• Enclosures.
• Adjacent motors.
• Linear axes.
• Gearboxes.
• Structural components.

11.6 Keyless Shaft

The keyless shaft configuration can provide a clean interface with compatible clamping couplings and transmission components.

This can be particularly convenient in precision motion systems where shaft alignment and coupling selection are carefully controlled.

11.7 Industrial Automation Compatibility

The motor belongs to a widely used industrial servo family and is designed around conventional servo-motion concepts such as position, velocity and torque control.

This makes it suitable for integration into automated production equipment where coordinated motion is required.

12. Important Selection Considerations

Although the MPL-A4540C-SK72AA has a relatively broad industrial application range, the motor should not be selected only from its nominal power rating.

A complete motor selection should consider:

13. Five Same-Series or Closely Related Models

The following models are closely related to the MPL-A4540C-SK72AA and can be considered when the application requires a different shaft configuration, feedback configuration, brake option, or speed rating.

Because the suffixes represent different mechanical/electrical configurations, the models should not be treated as direct plug-and-play replacements without checking the complete ordering code.

The closest mechanical comparison is MPL-A4540C-SJ72AA, because it retains the same 130 mm frame, 101.6 mm stack and 1500 rpm class but uses a keyed shaft rather than a keyless shaft.

The MPL-A4540C-MJ72AA is relevant when the machine requires multi-turn absolute feedback.

The MPL-A4540F-SK72AA keeps the keyless shaft concept while moving to a higher 3000 rpm speed class, making it relevant for applications where higher rotational speed is required.

The MPL-A4530K-SK72AA uses a shorter 76.2 mm magnet stack and a 4000 rpm class, providing a more speed-oriented configuration.

The MPL-A4560F-SK72AA uses the same general 130 mm frame class with a longer 152.4 mm stack and is appropriate for applications requiring a higher torque/power capability within the family.

14. Five Commonly Selected Models Under the Same Brand

The following models represent additional models from the same brand and the same general servo/motion-control product range. They cover different frame sizes, speeds and performance levels.

For applications requiring a larger motor frame, the MPL-A540K-SK72AA is a significant step up in physical size compared with the MPL-A4540C-SK72AA.

Its 165 mm frame and 4000 rpm rating make it a different performance class and therefore it should be selected based on actual load requirements rather than simply replacing the smaller motor.

The MPL-A560F-SK72AA is another larger-frame option with a longer magnet stack and a 3000 rpm speed class.

The MPL-A520K-SK72AA represents a shorter-stack configuration within the same general MPL family and can be considered where the application requires a different combination of speed, motor size and torque capability.

15. Comparison With the Main Model

16. Advantages in Machine Design

The MPL-A4540C-SK72AA can be particularly useful when the machine requires a servo motor that is neither extremely small nor excessively large.

Its 130 mm frame gives it a substantial mechanical structure, while the low-inertia design supports dynamic servo operation.

The 1500 rpm rating also means that it should not be viewed purely as a high-speed motor. Its characteristics make it more appropriate for controlled motion applications where torque, positioning and repeatability are important.

Another practical advantage is the combination of single-turn absolute feedback, keyless shaft construction and no-brake configuration.

This configuration can simplify the motor selection process for horizontal axes and rotary machinery that does not require mechanical holding.

17. Installation and Integration Notes

Before installing the MPL-A4540C-SK72AA, the machine designer should verify the complete mechanical interface.

The mounting flange, bolt arrangement, shaft dimensions and connector clearance should all be checked against the machine drawing.

The motor should also be paired with a compatible servo drive. The drive must be capable of supplying the required voltage and current and must support the feedback arrangement used by the motor.

Particular attention should be paid to the feedback cable because incorrect wiring can result in loss of position information or drive faults.

The motor power cable and feedback cable should also be routed in a manner that reduces the possibility of electrical interference.

Mechanical alignment is equally important. Excessive radial or axial shaft loading can negatively affect bearing life and motor performance.

18. Suitable Application Selection

19. Key Benefits at a Glance

20. Recommended Model Selection Logic

If the primary requirement is 1500 rpm with a keyless shaft, the MPL-A4540C-SK72AA is the relevant configuration.

If the machine requires a keyed shaft while maintaining the same general frame and stack configuration, the MPL-A4540C-SJ72AA is a closely related alternative.

If multi-turn absolute feedback is required, the MPL-A4540C-MJ72AA is a related configuration worth considering.

If the machine needs 3000 rpm, the MPL-A4540F-SK72AA moves the selection toward a higher-speed configuration.

If the application requires approximately 4000 rpm, a model such as the MPL-A4530K-SK72AA can be considered, provided its torque, inertia and physical dimensions meet the machine requirements.

For larger loads, the 165 mm-frame MPL configurations provide a different size/performance range.

21. Final Technical Summary

The MPL-A4540C-SK72AA is a low-inertia, brushless AC rotary servo motor in the MP-Series MPL family, designed for industrial motion-control applications.

Its principal characteristics are a 130 mm frame size, 101.6 mm magnet stack, 1500 rpm rated speed, approximately 1.5 kW rated output, 10.2 N·m continuous stall torque, 27.1 N·m peak stall torque, absolute single-turn high-resolution feedback, keyless shaft, SpeedTEC DIN connector and no mechanical brake.

Its approximate listed weight is 5.44 kg.

The combination of low rotor inertia and high-resolution feedback makes the motor suitable for machines that repeatedly perform controlled acceleration, deceleration and positioning.

The keyless shaft makes coupling selection an important part of the mechanical design, while the absence of a brake should be considered carefully for vertical or gravity-loaded applications.

For a direct replacement or retrofit, the most important points to verify are the motor frame, stack length, shaft configuration, encoder type, connector configuration, brake requirement, rated speed, torque requirement, drive compatibility, mounting dimensions and complete installation envelope.

The closest related models include MPL-A4540C-SJ72AA, MPL-A4540C-MJ72AA, MPL-A4540F-SK72AA, MPL-A4530K-SK72AA, and MPL-A4560F-SK72AA. These models provide different combinations of shaft type, feedback type, speed and stack length.

For purchasing or engineering replacement purposes, the exact suffix should be retained wherever possible. A model that appears mechanically similar can still have a different encoder, shaft, brake, connector or speed configuration, which may affect compatibility with the existing servo drive and machine.