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MPL-B4530K-SK74AA Detailed Product Information, Technical Specifications, Applications, Advantages and Related Models

The MPL-B4530K-SK74AA is a low-inertia AC rotary servo motor in the MP-Series MPL family. It is a 460 V-class, 4000 rpm servo motor with a 130 mm frame, 76.2 mm magnet stack, single-turn high-resolution encoder, keyless shaft and 24 V DC holding brake.

This model is particularly suitable for high-speed industrial motion applications where rapid acceleration and deceleration, accurate feedback, repeatable positioning and mechanical holding are required.

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1. Basic Product Information

The most important difference between this model and many other B4530K variants is the S-series single-turn high-resolution feedback configuration. It also includes the 24 V DC holding brake, making it particularly useful for axes that need a mechanical holding function.

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2. Detailed Technical Specifications

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3. Dimensions and Weight

The physical configuration of the MPL-B4530K-SK74AA is based on a 130 mm frame and a 76.2 mm magnet stack.

The frame size is an important factor when determining whether the motor can physically fit into an existing machine.

The 76.2 mm stack length identifies the motor’s active magnetic stack dimension. It is shorter than the 101.6 mm stack used by B4540F motors, making the B4530K configuration more compact in the axial direction.

The motor also uses a right-angle connector, so the installation envelope should include sufficient space for connector rotation and cable routing.

The approximately 10.1 kg weight should be used as a practical planning value. Actual shipping or packaged weight can be different from the motor’s net weight.

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4. Product Series

The product belongs to the:

MP-Series → MPL → Low-Inertia Brushless Servo Motor

The MPL family is designed for industrial motion-control applications.

Within the same family, different motor configurations are available for different feedback technologies, shaft arrangements, brake options, frame sizes, stack lengths and speed classes.

The B4530K configuration is particularly interesting because it combines a 130 mm frame with a 76.2 mm stack and 4000 rpm operation.

The SK74AA configuration further identifies the motor as a single-turn high-resolution encoder version with a keyless shaft and 24 V DC brake.

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5. Product Introduction

The MPL-B4530K-SK74AA is designed for machines that require considerably more control than a conventional induction motor can provide.

A conventional motor is generally selected when the primary requirement is continuous rotation.

A servo motor, by contrast, is designed to operate as part of a closed-loop motion system.

The controller sends a motion command to the servo drive.

The drive supplies controlled electrical power to the motor.

The encoder provides feedback concerning the motor’s movement.

The drive continuously uses this feedback to regulate the motor.

This architecture allows the MPL-B4530K-SK74AA to be used for precise positioning, controlled acceleration, controlled deceleration, speed regulation and synchronized machine movement.

The low-inertia design is particularly valuable in applications where the motor has to change speed frequently.

The integrated brake adds another useful feature: the ability to mechanically hold the motor when the axis is stationary.

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6. High-Resolution Single-Turn Feedback

One of the defining characteristics of the SK74AA configuration is its single-turn high-resolution encoder.

The encoder uses a 1024 Sin/Cos signal arrangement with Hiperface feedback technology.

This is different from the simpler incremental encoder configuration found on other MPL motors.

The single-turn absolute feedback provides the servo system with detailed positional information within one mechanical revolution.

This can be particularly useful in applications where the control system requires high-resolution position information.

The feedback configuration is one of the most important points to check when replacing an existing motor.

A motor with the same frame and torque rating but a different encoder should not automatically be treated as a direct electrical replacement.

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7. 24 V DC Holding Brake

The MPL-B4530K-SK74AA incorporates a 24 V DC holding brake.

This is particularly useful for applications where the motor needs to hold a stationary load after movement has stopped.

The brake can be valuable on:

• Vertical axes.
• Lifting mechanisms.
• Positioning slides.
• Automated handling systems.
• Machine-tool vertical axes.
• Pick-and-place systems.
• Gravity-loaded mechanisms.

The brake should primarily be regarded as a holding device rather than the only means of dynamically stopping a moving load.

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8. Keyless Shaft

The motor uses a keyless shaft extension.

A keyless shaft is useful when the machine uses an appropriate clamping coupling or other suitable shaft-hub connection.

This arrangement can simplify certain mechanical designs because the coupling does not have to be positioned around a traditional shaft key.

When selecting the coupling, engineers should consider:

• Shaft diameter.
• Coupling torque capacity.
• Maximum speed.
• Radial loading.
• Axial loading.
• Shaft alignment.
• Coupling rigidity.
• Required service life.
• Machine vibration.

The coupling should be properly matched to the motor and machine before operation.

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9. Right-Angle SpeedTEC DIN Connector

The motor uses a SpeedTEC DIN connector in a right-angle configuration.

The connector can be rotated through approximately 180°.

This feature is particularly useful when the motor is mounted in a compact machine.

Instead of having the cable exit in only one fixed direction, the connector orientation can be adjusted to suit the available installation space.

This can help reduce cable interference and simplify machine wiring.

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10. Main Product Advantages

10.1 High-Speed 4000 rpm Operation

The motor operates in the 4000 rpm class.

This makes it suitable for applications where high rotational speed contributes directly to machine throughput.

Examples include:

• Packaging.
• Printing.
• Converting.
• High-speed indexing.
• Material handling.
• Automated assembly.
• Rotary positioning.

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10.2 Low-Inertia Construction

The low-inertia rotor allows the motor to respond quickly to command changes.

This is especially valuable when a machine repeatedly accelerates, decelerates and reverses.

A low-inertia servo motor can also help reduce the time required to reach a new speed or position when the mechanical load is properly matched.

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10.3 High-Resolution Single-Turn Feedback

The single-turn high-resolution encoder provides detailed positional information.

This supports precise closed-loop motion control and can be advantageous in applications where repeatability and positioning performance are important.

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10.4 Integrated 24 V DC Brake

The holding brake adds a valuable mechanical function.

It can hold a stationary load and is especially useful for vertical axes.

This is one of the key reasons to select the SK74AA version instead of an otherwise similar no-brake configuration.

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10.5 Compact 130 mm Frame

The 130 mm frame provides a useful balance between motor output and physical size.

The 76.2 mm stack is relatively compact compared with longer-stack motors in the same frame family.

This can help when machine space is limited.

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10.6 Flexible Cable Orientation

The 180° rotatable right-angle connector provides installation flexibility.

This can be useful when the motor is installed close to a machine frame, guard, gearbox or other mechanical structure.

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11. Typical Applications

Packaging Machines

Packaging machinery often requires rapid and repeatable motion.

The motor can be used for:

• Product indexing.
• Feeding.
• Cutting.
• Sealing.
• Label positioning.
• Film handling.
• Rotary mechanisms.

The high-speed capability and servo feedback are particularly useful for high-cycle packaging systems.

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Vertical Motion Systems

The holding brake makes this motor especially suitable for vertical axes.

For example, a vertical positioning mechanism may move rapidly to a specified height and then remain stationary.

The servo system controls the movement while the brake can provide mechanical holding when appropriate.

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Automated Assembly Machines

Assembly equipment frequently needs accurate movement between multiple positions.

The motor can be used for:

• Pick-and-place movement.
• Tool positioning.
• Insertion mechanisms.
• Indexing tables.
• Transfer mechanisms.
• Clamping mechanisms.

The high-resolution feedback helps the motion system maintain repeatable movement.

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Material Handling

Material-handling systems can use servo motors for controlled movement of conveyors, transfer mechanisms and positioning axes.

The low-inertia design is helpful when the machine frequently changes speed.

The brake can also be useful where a load needs to remain stationary after movement.

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Printing Machinery

Printing systems require accurate speed control and synchronization.

A servo motor can coordinate movement between different machine sections.

The 4000 rpm operating capability is useful where high machine throughput is required.

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Converting Machinery

Converting applications include cutting, slitting, feeding and web handling.

These machines often require rapid changes in speed and precise synchronization.

The MPL-B4530K-SK74AA’s low inertia and high-resolution feedback can be advantageous in such systems.

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Machine Tools

The motor can be considered for suitable machine-tool axes and auxiliary motion mechanisms.

Actual selection should be based on torque, speed, load inertia, duty cycle and drive compatibility.

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12. Application Suitability Table

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13. Recommended Five Same-Series or Closely Related Models

The following models are useful for comparison because they belong to the same MPL family and share similar mechanical or performance characteristics.

MPL-B4530K-SK72AA

This is the closest no-brake comparison.

It maintains the same general S-series high-resolution single-turn feedback concept while eliminating the 24 V DC holding brake.

It can be a better choice when the application does not require mechanical holding.

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MPL-B4530K-SJ74AA

This model provides a useful comparison when a keyed shaft is required.

The main difference is mechanical rather than simply electrical.

If the existing machine uses a conventional keyed coupling, this type of configuration can be more appropriate than a keyless version.

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MPL-B4530K-MK74AA

This model is relevant when the application needs multi-turn high-resolution feedback.

It maintains the same general B4530K motor class but uses a different feedback architecture.

It can therefore be considered when the machine requires more advanced absolute position information.

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MPL-B4530K-RK74AA

This is the resolver-feedback alternative.

Resolver feedback can be appropriate in systems specifically designed around resolver-based motion feedback.

It should not be substituted for an encoder-based motor without checking drive and controller compatibility.

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MPL-B4540F-HK74AA

This model belongs to the same broader MPL family but uses a longer magnet stack and a different speed class.

The 101.6 mm stack provides a different torque/performance envelope from the 76.2 mm B4530K configuration.

It is therefore a useful alternative when the application requires a different balance of torque and speed.

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14. Related Model Comparison

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15. Five Other Popular Models from the Same Brand

The following models provide a broader comparison across the same brand’s industrial motion-control range.

These are better regarded as comparison models rather than universal direct replacements. Feedback type, shaft arrangement, brake configuration, motor speed and mechanical dimensions must all be checked before substitution.

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16. Comparison with the MPL-B4530K-HK74AA

The MPL-B4530K-HK74AA and MPL-B4530K-SK74AA are mechanically very close in the basic B4530K configuration.

The major difference is the feedback technology.

This comparison is important when selecting a replacement.

Even though both motors share the same general frame and stack, the feedback system is different.

The drive and controller must therefore be checked before changing from one configuration to the other.

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17. Advantages of the SK74AA Configuration

The SK74AA configuration is particularly attractive when the application requires several functions at the same time.

First, the motor provides 4000 rpm operation.

Second, it uses a low-inertia rotor.

Third, it provides single-turn high-resolution feedback.

Fourth, it includes a 24 V DC holding brake.

Fifth, it uses a keyless shaft.

Sixth, the right-angle connector can be rotated.

Together, these features make the motor suitable for demanding automated machinery where both motion performance and mechanical integration are important.

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18. Machine-Builder Benefits

For machine builders, one of the strongest advantages is the combination of high performance and a relatively compact motor envelope.

A 130 mm frame allows the motor to deliver substantial servo performance without moving into a much larger mechanical package.

The 76.2 mm magnet stack is useful where axial machine space is limited.

The right-angle connector makes cable routing easier.

The keyless shaft gives flexibility when choosing a coupling.

The 24 V DC brake is useful for axes that need holding capability.

The high-resolution feedback provides detailed motion information for the servo system.

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19. Recommended Applications by Requirement

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20. Selection Considerations

The motor should be selected according to the complete machine requirements rather than simply matching the rated torque.

The following items should be checked before purchase or replacement:

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21. Vertical-Axis Applications

The integrated brake makes this motor particularly suitable for vertical-axis applications.

A vertical axis can be exposed to gravitational forces even when the motor is not commanded to move.

For this reason, a holding mechanism can be important.

The 24 V DC brake provides an additional mechanical holding function once the motor is stationary.

Typical examples include:

• Vertical slides.
• Lifting systems.
• Automated elevators.
• Pick-and-place Z axes.
• Machine-tool vertical axes.
• Packaging-machine lifting mechanisms.
• Automated storage equipment.

The exact brake holding capacity and machine safety arrangement should always be evaluated against the actual load.

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22. Packaging Applications

In a packaging machine, the motor may be responsible for moving products or packaging material into an exact position.

The machine may need to perform a repeated cycle such as:

Accelerate → Move → Decelerate → Stop → Hold → Restart

The MPL-B4530K-SK74AA is well suited to this type of operating pattern.

Its low-inertia design helps reduce response time.

Its 4000 rpm speed rating supports fast production cycles.

Its high-resolution feedback provides accurate position information.

Its holding brake can provide additional mechanical holding when required.

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23. Pick-and-Place Applications

Pick-and-place systems frequently require rapid acceleration and deceleration.

A low-inertia servo motor can be advantageous because it can respond rapidly to changes in motion commands.

The high-resolution feedback supports repeatable positioning.

For a vertical pick-and-place axis, the brake adds another important advantage.

The motor can therefore be considered for both horizontal and vertical pick-and-place axes, subject to the actual torque and inertia calculations.

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24. Maintenance and Operating Considerations

Proper installation is important for achieving reliable servo performance.

The motor should be installed with correct shaft alignment and an appropriate coupling.

The coupling should not introduce excessive radial or axial loading.

The motor cable should be routed so that it does not experience excessive bending or mechanical stress.

The connector should be correctly secured.

The brake circuit should be wired according to the intended machine-control arrangement.

The encoder feedback system should also be protected from incorrect wiring and electrical interference.

During maintenance, attention should be given to:

• Bearing condition.
• Shaft condition.
• Coupling condition.
• Encoder feedback.
• Brake operation.
• Connector condition.
• Cable condition.
• Motor temperature.
• Mechanical vibration.

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25. Overall Technical Advantages

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26. Quick Reference Table

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27. Final Product Assessment

The MPL-B4530K-SK74AA is a high-speed, low-inertia servo motor designed for demanding industrial motion-control applications.

Its core configuration combines a 130 mm frame, 76.2 mm magnet stack, 4000 rpm operating class, approximately 8.25 N·m torque, single-turn high-resolution absolute feedback, keyless shaft, and 24 V DC holding brake.

The single-turn high-resolution encoder makes this model different from the incremental-feedback B4530K versions.

The brake makes it particularly useful for vertical axes and other mechanisms where the load needs to remain mechanically held after motion stops.

The low-inertia construction is well suited to machines that perform repeated acceleration and deceleration.

The right-angle, rotatable connector is another practical advantage when installation space is restricted.

For applications where the machine requires high-speed servo motion together with high-resolution single-turn feedback and a holding brake, the MPL-B4530K-SK74AA is a strong configuration within the MPL family.

When selecting a replacement, the most important points to match are feedback technology, shaft configuration, brake configuration, voltage class, frame size, magnet-stack length, rated speed, torque and connector arrangement.

A motor that looks mechanically similar is not necessarily an electrically compatible replacement, particularly when the feedback system is different.

Therefore, for a retrofit or replacement project, the complete model number should be checked against the existing servo drive, feedback interface, mechanical coupling and machine-control requirements.