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MPL-B580J-SK74AA Low-Inertia Servo Motor — Product Introduction, Specifications, Applications, Advantages and Model Recommendations

The MPL-B580J-SK74AA is a high-performance low-inertia AC servo motor designed for industrial motion-control applications that require accurate positioning, rapid acceleration and deceleration, stable speed control, and reliable repeated operation.

It belongs to the MP-Series MPL low-inertia brushless servo motor family and is particularly suitable for automated machinery in which the motor must respond quickly to frequent changes in position, speed, and torque.

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1. Product Basic Information

The exact mechanical envelope should be checked against the motor mounting arrangement and the machine layout before installation, because the connector orientation, shaft projection, brake assembly and other physical features contribute to the overall installed dimensions.

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2. Brand and Product Series

The product belongs to the Allen-Bradley brand.

Its product family is the MP-Series, and the specific motor family is the MPL low-inertia brushless servo motor series.

The MPL family is designed around the requirements of industrial servo systems. Compared with a conventional motor intended primarily for continuous rotation, an MPL servo motor is designed to work together with a servo drive and motion controller in a closed-loop control system.

The motor’s feedback device continuously provides position information to the control system. This allows the servo system to regulate the motor’s position, velocity and torque much more accurately.

For machinery that repeatedly performs indexing, positioning, acceleration, deceleration and direction changes, this type of motor is particularly useful.

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3. Product Introduction

The MPL-B580J-SK74AA is a relatively large-frame low-inertia servo motor intended for applications where both torque and dynamic response are important.

The motor combines a brushless permanent-magnet construction with high-resolution feedback. Its low-inertia rotor helps the servo system respond quickly when the commanded speed changes.

In a typical machine, the controller sends a motion command to the servo drive. The drive supplies the required electrical current to the motor, while the motor’s encoder continuously reports the actual shaft position.

The control system can therefore compare the commanded position with the actual position and make continuous corrections.

This makes the MPL-B580J-SK74AA suitable for machinery in which simple motor rotation is not enough. Instead, the machine needs the motor to arrive at a particular position, reach a specific speed, follow a motion profile or synchronize its movement with other axes.

The model also incorporates a 24 V DC holding brake, which makes it useful for certain vertical-axis and holding applications where the shaft needs to remain stationary when the motor is not energized.

The keyless shaft is another important characteristic. It is suitable for mechanical systems using compatible couplings and other shaft-mounted transmission components.

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4. Detailed Technical Parameters

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5. Model Number Explanation

The model number MPL-B580J-SK74AA is not simply a random identification number. The different sections identify characteristics of the motor configuration.

The most useful parts of the model number when comparing replacement motors are usually the feedback designation, shaft designation, frame/stack designation, voltage configuration and brake configuration.

For example, changing from a keyless-shaft version to a keyed-shaft version may require a different coupling or mechanical connection even when the motor frame looks very similar.

Likewise, changing from single-turn feedback to multi-turn feedback is not merely a cosmetic change. It can affect the way the servo system handles position information.

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6. Motor Performance

6.1 Continuous Torque

The MPL-B580J-SK74AA provides approximately 34 N·m of continuous torque.

Continuous torque is important when evaluating whether the motor can maintain the required mechanical load during normal operation.

For example, if a machine operates continuously at a particular speed and load, the motor needs enough continuous torque to maintain the movement without exceeding its normal operating capability.

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6.2 Peak Torque

The motor can provide approximately 81 N·m of peak torque for short-duration operating conditions.

Peak torque is particularly useful during acceleration and deceleration.

A machine may require considerably more torque when it starts moving than when it is already running at constant speed. Similarly, rapid stopping or reversing can create a temporary torque demand.

The difference between continuous torque and peak torque therefore gives the servo system additional flexibility during dynamic movements.

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6.3 Speed

The rated speed is approximately 3750 rpm, with maximum speed around 3800 rpm for the specified configuration.

The relatively high rotational speed makes this motor suitable for applications where rapid rotary movement is required.

High motor speed can also be useful when the motor is connected to a suitable transmission system that converts rotary speed into linear movement.

For example, when connected to a ball screw, belt drive or gearbox, motor speed can have a direct effect on the resulting machine-axis speed.

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7. Low-Inertia Design

Low inertia is one of the key characteristics of the MPL product family.

In a servo application, the motor is often required to accelerate and decelerate repeatedly.

Consider a machine that moves from one position to another, stops, returns to another position, stops again, and repeats the cycle hundreds or thousands of times.

A high-inertia motor can require more energy and more time to change its rotational speed.

A low-inertia motor can generally respond more rapidly to speed commands.

This characteristic is particularly valuable in:

• High-speed indexing machines
• Packaging equipment
• Pick-and-place systems
• Automated assembly machinery
• Material handling systems
• Printing equipment
• Cutting machinery
• Positioning equipment
• High-speed transfer systems

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8. Encoder and Feedback System

The MPL-B580J-SK74AA uses a single-turn high-resolution absolute feedback system.

The encoder is an important part of the servo motor because it provides the controller and drive with information about the motor shaft position.

The basic control process can be understood as:

Commanded Position → Servo Drive → Motor → Encoder Feedback → Servo Drive → Position Correction

This closed-loop process allows the motor to follow the commanded motion profile much more accurately than a conventional open-loop motor arrangement.

The specified feedback configuration uses Sin/Cos feedback with 1024 cycles per revolution.

The use of high-resolution feedback is especially useful when the machine requires:

• Accurate positioning
• Repeatable indexing
• Controlled acceleration
• Controlled deceleration
• Coordinated multi-axis movement
• Stable speed control
• Precise synchronization

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9. Keyless Shaft

The MPL-B580J-SK74AA uses a keyless shaft.

This is an important mechanical specification when selecting a replacement motor.

The shaft is normally connected to the machine through an appropriate coupling or transmission component.

Typical mechanical connections include:

• Precision couplings
• Gearboxes
• Ball screws
• Belt drives
• Rotary tables
• Linear actuators
• Indexing mechanisms
• Mechanical transmission assemblies

A keyless-shaft motor should not automatically be substituted with a keyed-shaft motor simply because the frame dimensions appear similar.

The shaft design, coupling and mechanical load must all be considered together.

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10. 24 V DC Brake

The motor incorporates a 24 V DC holding brake.

The brake is particularly useful where the motor needs to hold a position when servo power is removed.

One common example is a vertical axis.

A vertical machine axis can be affected by gravity when motor torque is removed. A properly selected holding brake can help keep the axis stationary.

Typical applications include:

• Vertical lifting axes
• Z-axis positioning
• Vertical transfer equipment
• Lifting mechanisms
• Automated storage systems
• Robotic vertical axes
• Material handling equipment

The brake should be regarded primarily as a holding device. The complete servo system should be designed so that normal dynamic stopping is handled appropriately by the servo control system.

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11. Connector Configuration

The MPL-B580J-SK74AA uses a right-angle SpeedTEC DIN connector.

The connector arrangement is useful for industrial machines because cable routing can become difficult around a large servo motor.

The connector can be rotated, allowing the cable direction to be adjusted to better suit the machine structure.

This can help when the motor is installed near:

• Machine frames
• Protective covers
• Cable carriers
• Gearboxes
• Other servo motors
• Pneumatic equipment
• Electrical components
• Linear guide systems

The connector configuration should be checked when designing the motor mounting area because the cable and connector require sufficient clearance.

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12. Dimensions and Mechanical Installation

The motor uses a Frame 5 configuration with an approximately 165 mm frame size and an approximately 203.2 mm magnet-stack length.

The 165 mm frame and 203.2 mm stack dimensions are particularly important when determining whether the motor can physically fit into an existing machine.

For a replacement project, the mounting flange, bolt-circle arrangement, shaft height, shaft projection, connector clearance and brake housing should all be checked.

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13. Product Weight

The approximate product weight is 34.1 kg.

This is a relatively substantial motor, so the mechanical structure should be designed to support the motor safely.

During installation, the weight should also be considered when determining:

• Mounting bracket strength
• Machine-frame rigidity
• Installation method
• Motor support
• Transportation requirements
• Maintenance access
• Removal and replacement procedures

The actual shipping weight can differ from the motor’s net weight because packaging materials and accessories can add additional weight.

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14. Main Product Applications

14.1 Packaging Machinery

Packaging machinery is one of the natural application areas for low-inertia servo motors.

The MPL-B580J-SK74AA can be used in machine functions such as:

• Product indexing
• Conveyor synchronization
• Film feeding
• Cutting
• Label positioning
• Carton positioning
• Filling-machine movement
• Pick-and-place mechanisms

Packaging machines often require very short cycle times. The ability to accelerate and decelerate quickly can therefore have a direct impact on productivity.

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14.2 Automated Assembly Equipment

Automated assembly systems frequently require controlled movement of individual components.

The motor can be used for:

• Component positioning
• Rotary assembly
• Transfer mechanisms
• Indexing tables
• Automated insertion
• Precision feeding
• Screwdriving axes
• Pick-and-place systems

The encoder feedback allows the motion system to monitor the motor position and maintain controlled movement.

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14.3 Material Handling

The motor can also be used in automated material-handling systems.

Typical applications include:

• Conveyor positioning
• Transfer systems
• Sorting mechanisms
• Automated storage equipment
• Pallet handling
• Product positioning
• Lifting mechanisms
• Automated transfer units

Where multiple machine axes need to operate together, servo feedback becomes particularly useful.

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14.4 Machine Tools

Potential machine-tool applications include:

• Auxiliary positioning axes
• Rotary positioning
• Indexing systems
• Tool positioning
• Automated material loading
• Workpiece positioning
• Transfer mechanisms

The motor’s combination of speed, torque and feedback makes it suitable for motion systems in which repeatability is important.

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14.5 Printing and Converting Equipment

Servo motors are widely used in machinery where material movement must remain synchronized.

Possible functions include:

• Web feeding
• Roll positioning
• Cutting
• Registration
• Indexing
• Material feeding
• Rotary movement
• Synchronization between machine sections

The servo motor’s feedback allows movement to be coordinated with other machine axes.

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15. Product Advantages

15.1 Fast Dynamic Response

The low-inertia design helps the motor respond quickly to changes in speed.

This is useful for machines with frequent starts, stops and reversals.

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15.2 Strong Torque Capability

With approximately 34 N·m continuous torque and approximately 81 N·m peak torque, the motor provides substantial torque capability for demanding motion-control applications.

This combination allows the motor to handle normal operating loads while also providing additional torque during short-duration acceleration events.

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15.3 High-Speed Operation

The approximately 3750 rpm rated speed makes the motor suitable for high-speed rotary applications.

When combined with an appropriate mechanical transmission, this can help improve machine cycle times.

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15.4 High-Resolution Feedback

The single-turn absolute encoder provides detailed position information.

This allows the servo system to achieve accurate and repeatable movement.

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15.5 Integrated Holding Brake

The 24 V DC brake provides a useful holding function for applications where the shaft must remain stationary.

This is particularly relevant to vertical machine axes.

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15.6 Keyless Shaft Configuration

The keyless shaft makes the motor suitable for mechanical systems designed around compatible precision couplings.

It can also simplify the selection of certain transmission components.

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15.7 Flexible Connector Arrangement

The rotatable right-angle connector gives the machine builder more freedom when routing motor cables.

This is particularly useful in compact machine designs.

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16. Five Recommended Models in the Same Series or Closely Related Family

The following models are useful for comparison when selecting an alternative to the MPL-B580J-SK74AA.

The first four models are particularly close comparisons because they retain the B580J mechanical family. The main differences are associated with shaft and feedback configurations.

The B640F model is a larger-frame alternative and should be considered when the machine requires a different mechanical and performance configuration rather than a direct physical replacement.

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17. Comparison of the Closest B580J Models

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18. How to Choose Between These Models

If the existing machine already uses a keyless coupling, the MPL-B580J-SK74AA is a natural configuration to consider.

If the machine uses a keyed mechanical connection, the MPL-B580J-SJ74AA may be more appropriate.

If the application requires multi-turn absolute positioning, the MPL-B580J-MK74AA or MPL-B580J-MJ74AA should be considered depending on the shaft configuration.

This distinction is important because a servo motor is not selected solely according to power and torque.

The following characteristics all need to match the machine:

Voltage + speed + torque + feedback + shaft + brake + mounting + connector + mechanical load.

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19. Five Popular Models Under the Same Brand

The following models can be used as additional comparison points when looking at products from the same brand and broader motion-control product range.

These models are useful when building a product comparison because they cover several common configuration differences: single-turn versus multi-turn feedback, keyless versus keyed shafts, and different motor frame configurations.

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20. Product Selection Table by Application

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21. Advantages Compared With a Conventional Motor

A conventional motor is normally selected according to factors such as voltage, power, speed and load.

A servo motor has additional selection requirements because it is part of a feedback-controlled motion system.

The MPL-B580J-SK74AA offers several advantages in this type of application.

Precise Position Control

The encoder provides position feedback, allowing the controller to monitor actual motor movement.

Fast Response

The low-inertia rotor is well suited to frequent acceleration and deceleration.

Repeatability

Closed-loop feedback makes repeated positioning movements more consistent.

High-Speed Movement

The motor’s rated speed supports fast machine movements.

Torque During Acceleration

The peak torque capability provides additional torque during short-duration dynamic conditions.

Holding Function

The integrated 24 V DC brake can help hold a vertical or stationary axis.

Flexible Mechanical Connection

The keyless shaft can be integrated with suitable precision couplings and mechanical transmissions.

Flexible Cable Installation

The rotatable right-angle connector helps accommodate different machine layouts.

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22. Typical Servo System Configuration

A typical application can be arranged as follows:

Motion Controller

↓

Servo Drive

↓

MPL-B580J-SK74AA

↓

Mechanical Transmission

↓

Machine Load

At the same time, encoder information travels back from the motor to the servo drive.

The servo drive uses this feedback to continuously regulate the motor.

For a positioning application, the controller may command the motor to move a specific distance.

The servo system then accelerates the motor, controls its speed during movement, decelerates it near the target position, and finally brings it to the commanded position.

This process can be repeated continuously throughout the machine’s operating cycle.

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23. Typical Mechanical Applications

The motor can be connected to different mechanical mechanisms depending on the machine design.

The correct mechanical transmission ratio should be selected according to the required load torque, machine speed and motor operating range.

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24. Maintenance Considerations

For long-term operation, the motor and surrounding machine should be inspected regularly.

Important inspection points include:

• Motor mounting bolts
• Mechanical coupling
• Shaft connection
• Motor cable
• Feedback cable
• Connector condition
• Brake operation
• Abnormal vibration
• Abnormal noise
• Motor temperature
• Mechanical alignment
• Load condition
• Cable bending radius
• Machine-frame rigidity

A servo motor that is mechanically misaligned can experience additional load on the shaft and bearings.

Likewise, poor cable routing can create unnecessary stress around the motor connector.

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25. Important Replacement Considerations

When replacing an existing MPL-B580J-SK74AA, the safest approach is to compare the complete model number.

The following characteristics should be checked before selecting an alternative:

A motor that has similar power but a different feedback or shaft configuration should not automatically be considered a direct replacement.

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26. Overall Product Evaluation

The MPL-B580J-SK74AA is a strong choice for applications where the machine requires a combination of high torque, high speed, low inertia, accurate feedback and repeatable positioning.

Its approximately 34 N·m continuous torque provides the motor with substantial continuous load capability, while approximately 81 N·m peak torque gives the servo system additional capacity during short-duration acceleration and transient load conditions.

The approximately 3750 rpm rated speed makes it suitable for high-speed motion, while the low-inertia design is particularly beneficial for applications that repeatedly accelerate, decelerate and reverse.

The single-turn high-resolution absolute feedback system is another major feature because accurate feedback is essential for modern servo applications.

The keyless shaft makes the model particularly appropriate for machines using compatible precision couplings.

The 24 V DC holding brake adds another useful function, especially for vertical axes.

The right-angle rotatable connector also provides practical advantages during machine installation and cable routing.

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27. Key Specifications at a Glance

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28. Final Summary

The MPL-B580J-SK74AA is a MP-Series MPL low-inertia brushless AC servo motor designed for demanding industrial motion-control applications.

Its approximately 165 mm frame size, 203.2 mm magnet-stack length, 3750 rpm rated speed, 34 N·m continuous torque, 81 N·m peak torque, single-turn high-resolution absolute feedback, keyless shaft, and 24 V DC holding brake give it a combination of characteristics suited to high-performance automated machinery.

The motor is particularly appropriate when a machine requires rapid and repeated movement rather than simple continuous rotation.

Its low-inertia construction makes it suitable for rapid acceleration and deceleration, while the encoder provides the feedback required for accurate positioning and coordinated motion.

The product can be considered for packaging equipment, automated assembly systems, material-handling machinery, indexing machines, positioning systems, printing and converting machinery, machine automation and other applications requiring controlled servo movement.

For replacement or new machine design, the most important point is to evaluate the complete motor configuration, rather than selecting a model based only on rated power. Feedback type, shaft design, brake configuration, mounting dimensions, connector arrangement, motor speed, continuous torque and peak torque all need to match the application.

Among closely related models, the MPL-B580J-SJ74AA is a logical comparison when a keyed shaft is required, while the MPL-B580J-MK74AA and MPL-B580J-MJ74AA are useful choices when multi-turn feedback is required. The larger-frame MPL-B640F-SJ74AA can be considered when a different motor frame and mechanical configuration is needed.

In short, the MPL-B580J-SK74AA is best suited to industrial machines that place a high value on fast response, precise positioning, strong torque output, high operating speed, repeatability and reliable closed-loop motion control.