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Allen-Bradley MPL-B4540F-MK74AA Low-Inertia Servo Motor

1. Product Overview

The Allen-Bradley MPL-B4540F-MK74AA is a high-performance low-inertia brushless AC rotary servo motor designed for industrial motion-control systems requiring fast response, accurate positioning, high repeatability, and reliable torque performance.

This model belongs to the MP-Series MPL Low-Inertia Servo Motor Series and is configured for the 460 V AC class. It uses a 130 mm frame, 101.6 mm magnet stack, 3000 RPM rated speed, multi-turn high-resolution absolute feedback, a keyless shaft, a right-angle SpeedTEC DIN connector, and an integral 24 V DC brake.

The combination of a low-inertia rotor, high-resolution absolute feedback, relatively high continuous torque, and high peak torque makes this motor suitable for demanding automation equipment where rapid acceleration and deceleration are required.

The MPL-B4540F-MK74AA is particularly useful when the machine requires a keyless shaft and an integral holding brake. This combination distinguishes it from several closely related MPL models that use keyed shafts or do not include a brake.

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2. Brand and Product Series

Item	Specification
Brand	Allen-Bradley
Product Family	MP-Series
Product Series	MPL Low-Inertia Servo Motors
Model	MPL-B4540F-MK74AA
Motor Type	Brushless AC rotary servo motor
Technology	Permanent-magnet synchronous servo motor
Voltage Class	460 V AC
Rated Speed	3000 RPM
Feedback	Multi-turn high-resolution absolute encoder
Shaft Configuration	Keyless shaft extension
Brake	Integral 24 V DC brake
Connector	SpeedTEC DIN
Mounting	IEC metric flange mount
Frame Size	130 mm
Magnet Stack	101.6 mm

The MPL Low-Inertia Series is intended for servo applications where dynamic performance is more important than simply achieving maximum motor power.

The design emphasizes rapid response, low rotor inertia, precise feedback, and compatibility with high-performance servo drives.

The MPL-B4540F-MK74AA is a medium-size motor within this product family and provides a useful balance between physical size, continuous torque, peak torque, speed, and dynamic response.

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3. Model Number Interpretation

The catalog number provides useful information about the motor’s basic configuration.

Model Code	Meaning
MPL	MPL low-inertia servo motor series
B	460 V class
45	Frame size 45 / approximately 130 mm
40	Magnet stack 40 / 101.6 mm
F	3000 RPM configuration
M	Multi-turn high-resolution absolute feedback
K	Keyless shaft extension
7	SpeedTEC DIN right-angle connector, 180° rotatable
4	Integral 24 V DC brake
AA	Standard catalog configuration designation

The model code therefore describes a 3000 RPM, 130 mm-frame, 101.6 mm-stack, multi-turn absolute-feedback, keyless-shaft servo motor with a 24 V DC brake.

This makes the model particularly useful for applications where the mechanical transmission requires a keyless coupling while the machine also needs motor-mounted holding capability.

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4. Detailed Technical Specifications

Parameter	MPL-B4540F-MK74AA
Model	MPL-B4540F-MK74AA
Brand	Allen-Bradley
Product Family	MP-Series
Product Series	MPL Low-Inertia
Product Type	Rotary servo motor
Motor Construction	Brushless permanent-magnet AC servo motor
Voltage Class	460 V AC
System Class	480 V AC
Rated Speed	3000 RPM
Maximum Speed	3000 RPM
Continuous Stall Torque	10.2 N·m
Peak Torque	27.1 N·m
Rated Continuous Output	2.6 kW
Rotor Inertia	Approx. 0.00056 kg·m²
Frame Size	130 mm
Frame Designation	Frame 45
Magnet Stack Length	101.6 mm
Stack Designation	Stack 40
Feedback	Multi-turn high-resolution absolute encoder
Feedback Resolution	1024 Sin/Cos cycles/rev
Feedback Protocol	Hiperface-type feedback
Shaft	Keyless shaft extension
Shaft Seal	No standard shaft seal
Brake	Integral 24 V DC brake
Connector	SpeedTEC DIN
Connector Orientation	Right-angle
Connector Rotation	180° rotatable
Mounting	IEC metric flange mount
Mounting Holes	Free mounting holes, Type FF
Operating Temperature	Up to approximately 40 °C
Approx. Motor Weight	Approx. 8.6–11.9 kg depending on catalog/configuration reference
Overall Size Class	130 mm frame × 101.6 mm magnet stack

The motor is rated at approximately 10.2 N·m continuous torque and 27.1 N·m peak torque, giving it a useful combination of sustained torque and short-duration acceleration capability.

The rated output is approximately 2.6 kW, while the 3000 RPM speed rating makes the motor appropriate for relatively fast industrial motion axes.

The rotor inertia is approximately 0.00056 kg·m² in one detailed configuration specification. Some general MPL-B4540F family references list approximately 0.00052 kg·m², so the exact value should be confirmed against the applicable motor revision and technical documentation when performing detailed servo sizing.

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5. Dimensions and Weight

Physical dimensions are particularly important when installing the MPL-B4540F-MK74AA into a machine.

The motor uses a 130 mm frame and a 101.6 mm magnet stack.

Mechanical Parameter	Specification
Model	MPL-B4540F-MK74AA
Frame Size	130 mm
Frame Designation	45
Magnet Stack	101.6 mm
Stack Designation	40
Mounting Standard	IEC metric
Mounting Type	Flange mount
Mounting Holes	Free mounting holes / Type FF
Shaft Type	Keyless
Connector	SpeedTEC DIN
Connector Style	Right-angle
Connector Rotation	180°
Brake	Integral 24 V DC
Approx. Motor Weight	Approx. 8.6–11.9 kg
Overall Mechanical Class	130 mm frame × 101.6 mm stack

Weight figures for this model can vary between catalog references depending on whether the listed value represents the base motor, brake-equipped configuration, or a particular catalog revision.

For machine layout and shipping calculations, it is therefore advisable to use the actual nameplate/catalog configuration weight rather than relying only on a generic family weight.

For preliminary engineering work, approximately 9–12 kg is a practical planning range for the brake-equipped configuration.

The machine designer should also leave adequate space for the shaft coupling, motor cable, connector, brake wiring, ventilation, and service access.

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6. Electrical Performance

The MPL-B4540F-MK74AA is designed for a 460 V AC class servo system and operates at a rated speed of 3000 RPM.

Its continuous torque is approximately 10.2 N·m, while peak torque reaches approximately 27.1 N·m.

Performance Parameter	Value
Voltage Class	460 V AC
Rated Speed	3000 RPM
Maximum Speed	3000 RPM
Continuous Torque	10.2 N·m
Peak Torque	27.1 N·m
Continuous Rated Power	2.6 kW
Rotor Inertia	Approx. 0.00056 kg·m²
Brake Voltage	24 V DC
Feedback	Multi-turn absolute

The relatively high peak-to-continuous torque ratio is useful for machinery that repeatedly accelerates and decelerates.

A servo motor is not normally operated continuously at peak torque. Peak torque is intended for short-duration dynamic conditions, while the continuous torque rating is the more important figure when sizing the motor for sustained mechanical load.

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7. Multi-Turn High-Resolution Absolute Encoder

The MPL-B4540F-MK74AA uses a multi-turn high-resolution absolute encoder.

This feedback system continuously provides the servo control system with information about motor position.

The multi-turn characteristic is particularly valuable when the application involves multiple motor revolutions and the controller needs to maintain reliable absolute position information.

The feedback configuration is based on high-resolution Sin/Cos feedback and an absolute multi-turn architecture.

This provides the servo system with accurate information for:

• Position control.
• Velocity control.
• Acceleration and deceleration.
• Electronic gearing.
• Electronic camming.
• Synchronization between axes.
• Repeatable indexing.
• High-speed positioning.

For automation equipment, high-quality feedback is one of the most important factors determining the final positioning performance of the complete servo system.

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8. Keyless Shaft Configuration

The MPL-B4540F-MK74AA uses a keyless shaft extension.

This is an important mechanical feature of the model.

Instead of relying on a conventional key and keyway, the motor can be connected to suitable clamping-type couplings or other mechanical transmission components designed for keyless shafts.

A keyless shaft can provide a clean mechanical connection and can be particularly useful in applications where high torsional stiffness, accurate alignment, and low backlash are required.

The selected coupling must be correctly sized for:

• Continuous torque.
• Peak torque.
• Maximum speed.
• Radial load.
• Axial load.
• Shaft diameter.
• Required alignment tolerance.
• Required torsional stiffness.

For servo systems, coupling selection is especially important because excessive backlash or torsional flexibility can negatively affect servo tuning and positioning accuracy.

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9. Integral 24 V DC Brake

The MPL-B4540F-MK74AA includes an integral 24 V DC brake.

This is one of the major differences between this model and the corresponding MK72AA configuration.

The brake is intended primarily as a holding device.

It is particularly useful when the motor must prevent the mechanical load from moving when servo torque is removed.

Typical applications include:

• Vertical lifting axes.
• Z-axis positioning systems.
• Vertical transfer mechanisms.
• Elevators and lifting equipment.
• Load-positioning systems.
• Machines requiring stationary holding after power removal.

The brake should be controlled according to the appropriate servo system design.

It should not be assumed that the integral motor brake automatically provides the complete safety function for a machine.

Where personnel safety or load-drop prevention is involved, the complete machine safety system should include appropriate independent safety measures.

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10. SpeedTEC DIN Connector

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

The connector can be rotated through approximately 180 degrees.

This is useful in compact machine installations where cable direction must be adapted to the machine frame.

The flexible connector orientation can help:

• Reduce cable interference.
• Simplify cable routing.
• Reduce unnecessary cable bending.
• Improve cabinet-to-motor cable layout.
• Simplify maintenance.
• Accommodate compact machine designs.

The connector and cable arrangement should still respect the specified cable bend radius and installation requirements.

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11. Low-Inertia Rotor Design

Low rotor inertia is one of the main characteristics of the MPL series.

The rotor inertia determines how much torque is required to change the rotational speed of the motor.

A lower inertia allows the motor to accelerate and decelerate more quickly.

For a machine operating hundreds or thousands of motion cycles per hour, this characteristic can have a direct effect on productivity.

The MPL-B4540F-MK74AA is therefore well suited to applications where the axis frequently performs:

Accelerate → Move → Decelerate → Stop → Reverse → Accelerate

This operating pattern is common in packaging, indexing, assembly, pick-and-place, and material-handling machinery.

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12. Main Product Advantages

12.1 Fast Dynamic Response

The low-inertia construction allows the motor to respond rapidly to servo commands.

This is useful when the machine requires short positioning times.

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12.2 High Continuous Torque

The 10.2 N·m continuous torque rating provides a substantial amount of sustained mechanical output for a 130 mm frame-class servo motor.

This makes the motor suitable for many medium-duty industrial motion applications.

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12.3 High Peak Torque

The 27.1 N·m peak torque rating provides significant additional torque during acceleration and other short-duration dynamic conditions.

This can help reduce positioning time and improve machine cycle performance.

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12.4 Multi-Turn Absolute Feedback

The high-resolution multi-turn absolute encoder provides detailed motor position information.

This is especially useful for precision automation and synchronized motion.

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12.5 Keyless Shaft

The keyless shaft is well suited to modern high-performance couplings.

It provides an alternative to conventional keyed-shaft mechanical transmission arrangements.

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12.6 Integral 24 V DC Brake

The built-in brake makes the model particularly useful for axes that require mechanical holding.

This is one of the strongest reasons to select the MK74AA configuration rather than a no-brake version.

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12.7 Compact Frame

The 130 mm frame provides a useful balance between torque output and installation space.

It is suitable for many industrial machines where a larger motor would unnecessarily increase the machine footprint.

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12.8 Flexible Connector Position

The 180-degree rotatable right-angle connector gives machine builders additional freedom in motor installation.

This can be especially helpful in tightly packed automation equipment.

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12.9 High-Speed Operation

The 3000 RPM rated speed allows the motor to support fast rotary motion and high-cycle machine operation.

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12.10 Broad Industrial Application Range

The motor can be used in packaging, assembly, material handling, indexing, printing, converting, inspection, and other automated production equipment.

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13. Typical Applications

Application	Typical Servo Function
Packaging Machinery	Indexing, feeding, cutting and positioning
Pick-and-Place	High-speed axis movement
Assembly Machines	Precision positioning
Material Handling	Conveyor and transfer positioning
Printing Equipment	Roller synchronization
Converting Machinery	Web and roller control
Labeling Equipment	Feed and registration
Inspection Machines	Camera and inspection positioning
Machine Tools	Auxiliary servo positioning
Vertical Axes	Positioning with brake holding
Indexing Tables	High-speed rotary positioning
Automated Production Lines	Coordinated servo motion
Textile Machinery	Synchronized rotary motion
General Factory Automation	Closed-loop motion control

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14. Packaging Machinery

Packaging machines frequently require high-speed repetitive motion.

The servo axis may need to accelerate rapidly, move to a precise position, stop, reverse direction, and repeat the cycle.

The MPL-B4540F-MK74AA is well suited to these requirements because of its combination of low rotor inertia, 3000 RPM operation, high peak torque, and high-resolution absolute feedback.

The integral brake can also be useful for machine axes that must remain stationary during shutdown or maintenance conditions.

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15. Vertical Motion Applications

The integrated 24 V DC brake makes this motor particularly interesting for vertical-axis applications.

Examples include:

• Vertical conveyors.
• Lifting platforms.
• Z-axis mechanisms.
• Vertical pick-and-place systems.
• Material lifts.
• Vertical transfer units.

When a vertical axis is used, the machine designer must consider the complete load-holding strategy.

The motor brake can provide holding capability, but the final machine safety concept may require additional mechanical protection depending on the application.

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16. Pick-and-Place Systems

Pick-and-place equipment depends heavily on rapid acceleration and deceleration.

The motor’s low inertia allows the servo axis to change speed quickly.

The absolute feedback system provides accurate position information.

The keyless shaft is suitable for high-performance mechanical couplings.

Together, these characteristics make the motor a good candidate for high-cycle automated handling equipment.

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17. Assembly Machinery

Automated assembly machines often have multiple synchronized axes.

One axis may position a component while another axis performs insertion, fastening, pressing, or inspection.

The MPL-B4540F-MK74AA can be used where precise closed-loop servo positioning is required.

Its high-resolution feedback and 3000 RPM operating speed make it appropriate for fast repetitive motion.

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18. Printing and Converting Machinery

Printing and converting machines often require synchronized motor operation.

Servo motors can be used for:

• Roller control.
• Web positioning.
• Feed mechanisms.
• Registration control.
• Cutting.
• Slitting.
• Indexing.

The high-resolution feedback of the MPL-B4540F-MK74AA can support accurate synchronization between multiple machine axes.

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19. Five Same-Series or Closely Related Models

The following models are useful alternatives when comparing the MPL-B4540F-MK74AA with motors having similar mechanical and electrical characteristics.

Model	Speed	Continuous Torque	Peak Torque	Power	Frame / Stack	Feedback	Shaft	Brake	Approx. Weight
MPL-B4540F-MJ74AA	3000 RPM	10.2 N·m	27.1 N·m	2.6 kW	130 × 101.6 mm	Multi-turn absolute	Keyed	24 V DC	Approx. 10.6 kg
MPL-B4540F-MJ72AA	3000 RPM	10.2 N·m	27.1 N·m	2.6 kW	130 × 101.6 mm	Multi-turn absolute	Keyed	No	Approx. 8.6 kg
MPL-B4540F-MK72AA	3000 RPM	10.2 N·m	27.1 N·m	2.6 kW	130 × 101.6 mm	Multi-turn absolute	Keyless	No	Approx. 6.8–8.6 kg
MPL-B4530F-MK74AA	3000 RPM	Approx. 8.25 N·m	Approx. 20.3 N·m	Approx. 2.1 kW	130 × 76.2 mm	Multi-turn absolute	Keyless	24 V DC	Approx. 7.3 kg
MPL-B4560F-MK74AA	3000 RPM	14.1 N·m	34.4 N·m	3.2 kW	130 × 152.4 mm	Multi-turn absolute	Keyless	24 V DC	Approx. 11.8 kg

These models cover several practical alternatives.

The MPL-B4540F-MJ74AA has similar performance but uses a keyed shaft.

The MPL-B4540F-MJ72AA has the same general motor performance but does not include the integral brake.

The MPL-B4540F-MK72AA is the closest no-brake counterpart to the subject model because it retains the keyless shaft.

The MPL-B4530F-MK74AA provides a shorter stack and lower torque.

The MPL-B4560F-MK74AA increases the stack length and provides substantially higher torque.

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20. Detailed Comparison with MPL-B4540F-MK72AA

The MPL-B4540F-MK72AA is one of the most direct alternatives.

The two motors share the same general frame, stack, speed, feedback, and keyless shaft configuration.

The main difference is the brake.

Feature	MPL-B4540F-MK74AA	MPL-B4540F-MK72AA
Frame	130 mm	130 mm
Stack	101.6 mm	101.6 mm
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	Multi-turn absolute	Multi-turn absolute
Shaft	Keyless	Keyless
Brake	24 V DC	No brake
Connector	SpeedTEC DIN	SpeedTEC DIN
Approx. Weight	Approx. 8.6–11.9 kg	Approx. 6.8–8.6 kg

If the machine needs a holding brake, the MK74AA is the better choice.

If no brake is required and minimum motor weight is preferred, the MK72AA is generally the simpler configuration.

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21. Comparison with MPL-B4540F-MJ74AA

The MPL-B4540F-MJ74AA has almost the same basic electrical performance but uses a keyed shaft.

Feature	MPL-B4540F-MK74AA	MPL-B4540F-MJ74AA
Frame	130 mm	130 mm
Stack	101.6 mm	101.6 mm
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	Multi-turn absolute	Multi-turn absolute
Shaft	Keyless	Keyed
Brake	24 V DC	24 V DC
Connector	SpeedTEC DIN	SpeedTEC DIN
Frame Class	130 mm	130 mm
Stack	101.6 mm	101.6 mm

The choice between these two models should primarily be based on the mechanical coupling design.

If the machine transmission uses a keyless clamping hub, the MK74AA is the appropriate configuration.

If the machine already uses a keyed coupling, the MJ74AA may be more convenient.

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22. Comparison with MPL-B4530F-MK74AA

The MPL-B4530F-MK74AA has a shorter magnet stack and lower torque capability.

Feature	MPL-B4540F-MK74AA	MPL-B4530F-MK74AA
Frame	130 mm	130 mm
Stack	101.6 mm	76.2 mm
Speed	3000 RPM	3000 RPM
Continuous Torque	10.2 N·m	Approx. 8.25 N·m
Peak Torque	27.1 N·m	Approx. 20.3 N·m
Power	2.6 kW	Approx. 2.1 kW
Feedback	Multi-turn absolute	Multi-turn absolute
Shaft	Keyless	Keyless
Brake	24 V DC	24 V DC
Approx. Weight	Approx. 8.6–11.9 kg	Approx. 7.3 kg

The shorter-stack model is useful when the machine requires less torque and a shorter motor package.

The B4540F configuration should be selected when the additional torque and power are required.

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23. Comparison with MPL-B4560F-MK74AA

The MPL-B4560F-MK74AA moves in the opposite direction.

It uses a longer magnet stack and produces more torque.

Feature	MPL-B4540F-MK74AA	MPL-B4560F-MK74AA
Frame	130 mm	130 mm
Stack	101.6 mm	152.4 mm
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
Power	2.6 kW	3.2 kW
Feedback	Multi-turn absolute	Multi-turn absolute
Shaft	Keyless	Keyless
Brake	24 V DC	24 V DC
Approx. Weight	Approx. 8.6–11.9 kg	Approx. 11.8 kg

The B4560F configuration is a logical choice when the 10.2 N·m continuous torque of the B4540F is insufficient.

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24. Five Popular Allen-Bradley Servo Models

The following models are useful additional choices when comparing products within the broader Allen-Bradley servo-motor range.

Model	Series	Speed	Continuous Torque	Peak Torque	Power	Frame / Stack	Feedback	Shaft / Brake	Approx. Weight
MPL-B4540F-MJ74AA	MPL	3000 RPM	10.2 N·m	27.1 N·m	2.6 kW	130 × 101.6 mm	Multi-turn absolute	Keyed / 24 V brake	Approx. 10.6 kg
MPL-B4540F-MJ72AA	MPL	3000 RPM	10.2 N·m	27.1 N·m	2.6 kW	130 × 101.6 mm	Multi-turn absolute	Keyed / No brake	Approx. 8.6 kg
MPL-B4530F-MJ74AA	MPL	3000 RPM	Approx. 8.25 N·m	Approx. 20.3 N·m	Approx. 2.1 kW	130 × 76.2 mm	Multi-turn absolute	Keyed / 24 V brake	Approx. 7.3 kg
MPL-B4560F-MJ74AA	MPL	3000 RPM	14.1 N·m	34.4 N·m	3.2 kW	130 × 152.4 mm	Multi-turn absolute	Keyed / 24 V brake	Approx. 11.8 kg
MPL-B540K-MJ74AA	MPL	4000 RPM	19.4 N·m	48.6 N·m	5.4 kW	Approx. 165 × 101.6 mm	Multi-turn absolute	Keyed / 24 V brake	Approx. 15.0 kg

These five models represent different combinations of speed, torque, stack length, shaft style, and brake configuration.

The B4530F is suitable for lower torque requirements.

The B4540F is a balanced medium-output configuration.

The B4560F provides higher torque while retaining the same general 130 mm frame class.

The B540K moves into a substantially higher power and torque class and is more appropriate for heavier-duty motion applications.

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25. Selection Guide

The correct servo motor should be selected based on the actual mechanical load rather than simply choosing the largest available motor.

The following selection logic is useful.

Requirement	Recommended Direction
Around 8 N·m continuous torque	B4530F class
Around 10 N·m continuous torque	B4540F class
Around 14 N·m continuous torque	B4560F class
Around 19 N·m continuous torque	B540K class
Keyless shaft required	MK configuration
Keyed shaft required	MJ configuration
Brake required	74 configuration
No brake required	72 configuration
3000 RPM operation	F configuration
Multi-turn absolute feedback	M configuration
High dynamic response	MPL low-inertia series

For an application requiring approximately 10.2 N·m continuous torque, 27.1 N·m peak torque, 3000 RPM, multi-turn absolute feedback, keyless shaft, and a holding brake, the MPL-B4540F-MK74AA is a very well-matched configuration.

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26. Installation Considerations

The motor should be mounted on a rigid and accurately machined mounting surface.

Servo motors are sensitive to mechanical misalignment.

Incorrect alignment can introduce unwanted radial or axial loads and may reduce bearing life.

The keyless shaft should be connected using a suitable coupling or clamping mechanism.

The coupling must be properly aligned with the driven shaft.

The motor cable should be routed in a manner that avoids excessive bending or mechanical stress at the connector.

Because the SpeedTEC DIN connector can be rotated, the connector can normally be positioned to suit the available machine space.

Adequate service clearance should be provided around the motor.

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27. Servo Drive Matching

The MPL-B4540F-MK74AA is intended to operate as part of a compatible servo drive system.

Drive selection should take into account:

• Motor voltage.
• Motor continuous current.
• Motor peak current.
• Motor feedback type.
• Feedback protocol.
• Required speed.
• Required acceleration.
• Required deceleration.
• Load inertia.
• Motor-to-load inertia ratio.
• Safety requirements.
• Cable configuration.

The drive should be correctly configured for the specific motor catalog number.

Incorrect motor parameters can lead to poor servo performance, excessive following error, unstable operation, or drive faults.

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28. Load Inertia and Servo Tuning

One of the important factors in selecting a low-inertia servo motor is the relationship between motor rotor inertia and external load inertia.

The motor may have excellent dynamic performance, but if the mechanical load is extremely large relative to the motor, the complete system may still require careful tuning.

The machine designer should evaluate:

• Load inertia.
• Gear ratio.
• Coupling inertia.
• Reflected inertia.
• Acceleration time.
• Deceleration time.
• Required positioning accuracy.
• Mechanical resonance.
• Maximum torque demand.

The goal is not simply to select a motor with enough continuous torque.

The motor should also have enough peak torque to achieve the desired acceleration without excessive current demand.

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29. Brake Application Considerations

The integrated 24 V DC brake is an important feature, but it should be used correctly.

The brake is primarily intended to hold the shaft when the servo motor is not producing commanded torque.

In a vertical axis, the brake can prevent the load from freely moving when motor power is removed.

However, the brake should not normally be used as a high-frequency dynamic stopping device.

Repeatedly using the brake to stop a moving load can produce unnecessary mechanical wear.

Normal machine deceleration should generally be performed by controlled servo torque, while the brake provides holding functionality when appropriate.

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30. Maintenance and Troubleshooting

The MPL-B4540F-MK74AA is designed for industrial service, but correct installation and operating conditions are important for long-term reliability.

If abnormal vibration occurs, check:

• Motor mounting.
• Shaft coupling alignment.
• Mechanical resonance.
• Load balance.
• Bearing condition.
• Servo tuning.

If positioning accuracy becomes poor, check:

• Feedback wiring.
• Encoder configuration.
• Servo tuning.
• Mechanical backlash.
• Coupling stiffness.
• Load inertia.

If the motor becomes unusually hot, check:

• Continuous load torque.
• Duty cycle.
• Ambient temperature.
• Motor ventilation.
• Drive current.
• Mechanical friction.

If the brake does not release correctly, check:

• 24 V DC brake supply.
• Brake wiring.
• Brake control logic.
• Drive configuration.
• Mechanical brake condition.

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31. Advantages for Machine Builders

The MPL-B4540F-MK74AA offers several practical advantages from a machine-design perspective.

The 130 mm frame provides a relatively compact solution for a 2.6 kW-class servo application.

The 3000 RPM speed rating supports high-cycle automation.

The low-inertia rotor improves dynamic response.

The multi-turn absolute encoder supports precise position control.

The keyless shaft provides flexibility in mechanical coupling selection.

The integrated 24 V DC brake provides holding capability without requiring a separate external motor brake assembly.

The rotatable SpeedTEC DIN connector simplifies cable routing.

The overall configuration is therefore well suited to machines where mechanical space, dynamic response, and precise motion control are all important.

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32. Application Suitability

Application	Suitability
Packaging	Excellent
Pick-and-Place	Excellent
Automated Assembly	Excellent
Indexing	Excellent
Precision Positioning	Excellent
Material Handling	Very Good
Vertical Axis	Excellent when properly safety-designed
Printing	Very Good
Converting	Very Good
Labeling	Excellent
Inspection Equipment	Excellent
Machine Tools	Very Good
Textile Equipment	Very Good
General Factory Automation	Excellent

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33. Quick Reference Table

Parameter	MPL-B4540F-MK74AA
Model	MPL-B4540F-MK74AA
Brand	Allen-Bradley
Family	MP-Series
Series	MPL Low-Inertia Servo Motors
Motor Type	Brushless AC rotary servo motor
Voltage	460 V AC class
Speed	3000 RPM
Continuous Torque	10.2 N·m
Peak Torque	27.1 N·m
Rated Power	2.6 kW
Rotor Inertia	Approx. 0.00056 kg·m²
Frame Size	130 mm
Magnet Stack	101.6 mm
Feedback	Multi-turn high-resolution absolute encoder
Feedback Resolution	1024 Sin/Cos cycles/rev
Shaft	Keyless
Brake	24 V DC integral brake
Connector	SpeedTEC DIN
Connector Position	Right-angle, 180° rotatable
Mounting	IEC metric flange
Mounting Holes	Free mounting holes, Type FF
Shaft Seal	No standard shaft seal
Operating Temperature	Up to approximately 40 °C
Approx. Weight	Approx. 8.6–11.9 kg
Main Application	Industrial closed-loop motion control

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34. Final Product Assessment

The Allen-Bradley MPL-B4540F-MK74AA is a strong choice for industrial machines that require a combination of fast servo response, accurate positioning, substantial continuous torque, high peak torque, absolute feedback, keyless mechanical coupling, and motor-mounted holding capability.

Its 10.2 N·m continuous torque and 27.1 N·m peak torque provide a useful performance range for medium-duty industrial motion axes.

The 3000 RPM operating speed makes it suitable for high-cycle automation, while the low-inertia rotor supports rapid acceleration and deceleration.

The multi-turn high-resolution absolute encoder provides the feedback performance needed for accurate servo positioning and coordinated multi-axis motion.

The keyless shaft is particularly useful when the machine uses a clamping-type coupling or other keyless mechanical transmission arrangement.

The 24 V DC integral brake makes this version especially attractive for applications where the axis needs to remain mechanically held when servo torque is removed.

The SpeedTEC DIN right-angle connector, with approximately 180 degrees of rotational adjustment, provides additional flexibility when designing the motor and cable installation.

For applications that do not require a brake, the closely related MPL-B4540F-MK72AA can be considered.

For applications requiring a keyed shaft instead of a keyless shaft, the MPL-B4540F-MJ74AA is a natural alternative.

For applications requiring less torque and a shorter motor package, the MPL-B4530F-MK74AA can be considered.

For higher torque requirements while retaining the general 130 mm frame class, the MPL-B4560F-MK74AA provides a higher-output alternative.

Overall, the MPL-B4540F-MK74AA can be summarized as a 3000 RPM, 2.6 kW-class, 130 mm-frame, low-inertia servo motor with 10.2 N·m continuous torque, 27.1 N·m peak torque, multi-turn absolute feedback, keyless shaft, SpeedTEC DIN connector, and integral 24 V DC brake.

It is particularly well suited to packaging machinery, indexing systems, pick-and-place equipment, automated assembly, material handling, precision positioning, vertical axes, printing, converting, and general industrial automation.