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MPL-B540K-SJ72AA Low-Inertia Servo Motor

1. Product Overview

The MPL-B540K-SJ72AA is a high-performance low-inertia rotary servo motor belonging to the MP-Series MPL servo motor family. It is designed for industrial motion-control applications where accurate positioning, rapid acceleration and deceleration, high rotational speed, and dependable torque performance are required.

The motor is a 5.4 kW class, 4000 rpm servo motor with approximately 19.4 N·m continuous stall torque and 48.6 N·m peak torque. It uses a 165 mm frame size and a 101.6 mm magnet stack length, placing it in the larger end of the frame-5 MPL motor range while still maintaining the low-inertia characteristics associated with this product family.

A particularly important feature of the MPL-B540K-SJ72AA is its single-turn high-resolution absolute feedback system. The motor uses a 1024-cycle-per-revolution Sin/Cos feedback arrangement with Hiperface protocol. This makes it suitable for applications requiring accurate shaft position information and coordinated servo motion.

The motor has a keyed shaft, no integral brake, and a right-angle SpeedTec DIN connector that can be rotated through approximately 180°. These characteristics make the model particularly useful in machine designs where conventional keyed mechanical transmission and flexible cable routing are preferred.

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2. Brand

Brand: Allen-Bradley

The MPL-B540K-SJ72AA is part of the Allen-Bradley industrial motion-control product range.

For practical identification purposes, the important information is the complete catalog number:

MPL-B540K-SJ72AA

The complete suffix should be retained when selecting a replacement because different suffixes within the B540K family can change the feedback type, shaft arrangement, brake configuration, connector configuration, or other factory characteristics.

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3. Product Series

Product Series: MP-Series MPL

Series Type: Low-Inertia Brushless Servo Motor

The MPL family is designed for industrial servo applications that require controlled speed, torque, and position.

Within this family, the B540K configuration represents a relatively high-speed, medium-to-high-torque motor. The B540K family is rated for approximately 4000 rpm and 5.4 kW, with approximately 19.4 N·m continuous stall torque and 48.6 N·m peak torque.

The B540K motor is therefore positioned above the smaller B520K in output and torque capability, while remaining faster than lower-speed configurations such as the B540D.

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4. Complete Model Identification

Parameter	Specification
Model	MPL-B540K-SJ72AA
Brand	Allen-Bradley
Product Family	MP-Series MPL
Motor Type	Low-Inertia Brushless Rotary Servo Motor
Voltage Class	400 V AC class
System Family	460/480 V class MPL servo motor
Frame Size	Frame 5
Frame Diameter / Frame Reference	165 mm
Magnet Stack Length	101.6 mm
Maximum Speed	4000 rpm
Rated Speed	4000 rpm
Continuous Stall Torque	19.4 N·m
Peak Torque	48.6 N·m
Rated Continuous Output	5.4 kW
Rotor Inertia	Approximately 0.00147 kg·m²
Feedback	Absolute single-turn
Feedback Resolution	1024 cycles/rev
Feedback Protocol	Hiperface
Shaft	Keyed
Shaft Seal	No
Brake	No brake
Connector	SpeedTec DIN
Connector Orientation	Right angle
Connector Rotation	Approximately 180°
Mounting	IEC metric flange mount
Mounting Holes	Free mounting holes, Type FF
Protection	Standard protection
Maximum Operating Temperature	40 °C
Approximate Motor Weight	Approximately 15 kg
Magnet Stack Code	40
Application Type	Industrial servo motion

The exact product description identifies the motor as a 460 V-class, frame-5, 101.6 mm stack, 4000 rpm servo motor with a single-turn high-resolution encoder, keyed shaft, no brake, and right-angle rotatable DIN connector.

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5. Main Technical Parameters

Technical Parameter	MPL-B540K-SJ72AA
Model	MPL-B540K-SJ72AA
Rated Output	5.4 kW
Maximum Speed	4000 rpm
Rated Speed	4000 rpm
Continuous Stall Torque	19.4 N·m
Peak Torque	48.6 N·m
Continuous Stall Current	Approximately 20.5 A, 0-peak
Rotor Inertia	Approximately 0.00147 kg·m²
Voltage Class	400 V AC
Frame Size	165 mm
Magnet Stack	101.6 mm
Feedback Type	Absolute single-turn
Feedback Resolution	1024 Sin/Cos cycles per revolution
Feedback Protocol	Hiperface
Shaft Configuration	Keyed
Shaft Seal	No
Brake	None
Connector	SpeedTec DIN
Connector Type	Right angle
Connector Rotation	180° rotatable
Mounting	IEC metric
Mounting Holes	Free mounting holes, Type FF
Operating Temperature	Up to 40 °C
Approximate Weight	15 kg
Motor Construction	Low-inertia brushless servo
Intended Duty	Industrial servo motion

The principal B540K family performance figures are 4000 rpm, 19.4 N·m continuous torque, 48.6 N·m peak torque, and 5.4 kW output.

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6. Dimensions

For this motor, the most useful confirmed dimensional references are the 165 mm frame size and 101.6 mm magnet stack length.

Dimension	Specification
Model	MPL-B540K-SJ72AA
Frame Size	165 mm
Frame Size in Inches	6.50 in
Magnet Stack Length	101.6 mm
Magnet Stack in Inches	4.0 in
Mounting Standard	IEC metric
Mounting Flange	Metric flange mount
Mounting Holes	Free mounting holes, Type FF
Shaft Configuration	Keyed
Overall Motor Envelope	Refer to mechanical drawing
Shaft Projection	Refer to mechanical drawing
Flange Dimensions	Refer to mechanical drawing
Connector Clearance	Additional space required
Approximate Weight	15 kg

The manufacturer description specifically confirms the 165 mm frame size and 101.6 mm stack length.

The 165 mm value should not be interpreted as the complete overall length or height of the motor. A servo motor’s actual installation envelope also includes the shaft extension, flange, rear housing, connector, and cable clearance.

For machine layout work, the final mechanical drawing should therefore be used to determine the exact mounting-hole spacing, shaft dimensions, total length, and connector clearance.

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7. Weight

The B540K motor family has a nominal weight of approximately 15 kg for the basic motor configuration. The family-level technical data lists the B540K at approximately 15 kg, while the exact SJ72AA configuration is a no-brake version.

Weight Parameter	Value
Model	MPL-B540K-SJ72AA
Approximate Motor Weight	15 kg
Approximate Weight in Pounds	33 lb
Integral Brake	None
Brake Weight Addition	Not applicable
Shipping Weight	Higher than motor-only weight

The no-brake configuration is advantageous when the machine does not require an integrated holding brake and when minimizing unnecessary motor mass is desirable.

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8. Motor Power

The MPL-B540K-SJ72AA belongs to the 5.4 kW continuous output class.

This power level places the motor between smaller industrial servo motors and larger high-torque servo configurations.

The 5.4 kW output is particularly useful for machinery where a smaller servo motor would not provide enough torque but a substantially larger motor would add unnecessary size and mass.

The combination of approximately 5.4 kW output and 4000 rpm maximum speed gives the motor a useful operating range for high-throughput industrial equipment.

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9. Speed Performance

The maximum and rated speed of the MPL-B540K-SJ72AA are both specified at approximately 4000 rpm.

A 4000 rpm servo motor is particularly useful for:

• High-speed rotary machinery
• Packaging equipment
• Fast indexing systems
• Material-handling mechanisms
• Ball-screw axes
• Machine-tool feed systems
• Automated assembly equipment
• High-speed positioning systems

The 4000 rpm rating also makes the B540K considerably faster than the B540D, which belongs to the 2000 rpm class.

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10. Torque Performance

The motor provides approximately 19.4 N·m continuous stall torque and 48.6 N·m peak torque.

Torque Characteristic	Value
Model	MPL-B540K-SJ72AA
Continuous Stall Torque	19.4 N·m
Peak Torque	48.6 N·m
Peak-to-Continuous Ratio	Approximately 2.5:1
Application Benefit	Strong acceleration and transient load capability

Continuous torque is important for long-duration load requirements.

Peak torque becomes especially important during acceleration, deceleration, rapid direction changes, and short-duration overload conditions.

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11. Rotor Inertia

The B540K family has a rotor inertia of approximately 0.00147 kg·m².

Rotor inertia describes the motor’s resistance to changes in rotational speed.

A lower rotor inertia is generally advantageous when the machine needs rapid acceleration and deceleration.

This is particularly useful in:

• Pick-and-place systems
• Indexing mechanisms
• High-speed packaging
• Electronic assembly
• Short-travel positioning axes
• Repetitive reciprocating mechanisms

The low-inertia design is one of the major reasons the MPL family is used for dynamic servo applications rather than simple constant-speed motor operation.

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12. Single-Turn Absolute Feedback

The most important configuration characteristic distinguishing the SJ72AA version from many other B540K variants is its single-turn absolute feedback.

The exact model is specified with an absolute single-turn 1024 Sin/Cos encoder using Hiperface protocol.

This feedback arrangement provides accurate position information within each revolution.

Single-turn feedback can be particularly suitable for applications where:

• The mechanical axis has a limited angular operating range.
• The machine returns to a known reference during normal operation.
• Absolute position within one revolution is important.
• A high-resolution servo feedback signal is required.
• Coordinated motion between multiple axes is required.

The distinction between single-turn and multi-turn feedback should be considered carefully when replacing an existing motor.

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13. Single-Turn Versus Multi-Turn

The B540K family includes both single-turn and multi-turn feedback configurations.

Feature	MPL-B540K-SJ72AA	Typical B540K Multi-Turn Version
Feedback	Single-turn absolute	Multi-turn absolute
Resolution	1024 Sin/Cos cycles/rev	High-resolution absolute
Position Range	One motor revolution	Multiple motor revolutions
Shaft	Keyed	Depends on suffix
Brake	No brake	Depends on suffix
Typical Use	Precision rotary position	Extended-position servo axes
Basic Motor Family	B540K	B540K

The correct choice depends on the machine’s position architecture and control requirements.

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14. Keyed Shaft

The MPL-B540K-SJ72AA has a keyed shaft extension.

A keyed shaft is a conventional industrial mechanical interface.

It can be connected to:

• Servo couplings
• Gearboxes
• Timing pulleys
• Mechanical transmissions
• Ball screws
• Rotary tables
• Other driven mechanisms

The keyed shaft is particularly useful when replacing an older servo motor that already uses a keyed mechanical interface.

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15. No Integral Brake

The MPL-B540K-SJ72AA is a no-brake version.

This configuration is suitable for applications where the servo axis does not need a motor-mounted holding brake.

Typical examples include horizontal positioning axes where the mechanical system naturally remains stationary after servo power is removed.

For vertical axes or gravity-loaded mechanisms, however, the absence of a motor brake requires special attention.

A vertical load should not be assumed to remain safely stationary simply because the servo motor is stopped.

The machine design may require a separate mechanical brake, counterbalance, locking mechanism, or another load-holding solution.

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16. Connector Design

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

The connector is described as 180° rotatable, providing flexibility during installation.

This is especially useful in machines where motor cable space is restricted.

The ability to change connector orientation can help:

• Avoid mechanical interference
• Reduce cable bending
• Improve cable routing
• Simplify cabinet-to-machine connections
• Reduce installation space
• Keep cables away from moving mechanisms

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17. Mounting Configuration

The motor uses an IEC metric mounting configuration with free mounting holes identified as Type FF.

This makes it appropriate for industrial machine construction where metric mounting standards are used.

When installing the motor, the mounting flange should be properly aligned with the machine structure.

The mounting surface should be rigid enough to prevent vibration, because excessive structural flexibility can affect servo positioning accuracy and can also increase mechanical noise.

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18. Protection and Operating Environment

The product specification identifies the motor as a standard-protection configuration and gives a maximum operating temperature of approximately 40 °C for the listed specification.

Environmental Parameter	Specification
Model	MPL-B540K-SJ72AA
Maximum Operating Temperature	40 °C
Shaft Seal	No
Protection Configuration	Standard
Food Grade	No
Installation	Industrial machinery
Cooling	Motor-specific thermal design
Environmental Suitability	Industrial automation environment

The absence of a shaft seal should be considered when the motor is installed in areas exposed to coolant, oil, washdown fluid, or other contamination.

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19. Main Product Advantages

19.1 High 4000 rpm Speed

The 4000 rpm rating allows the motor to support fast mechanical cycles.

This is particularly valuable in production machinery where machine throughput depends on rapid movement.

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19.2 Strong 19.4 N·m Continuous Torque

The continuous torque rating gives the B540K enough capacity for demanding servo axes while keeping the motor within a relatively compact frame.

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19.3 High 48.6 N·m Peak Torque

The peak torque capability provides additional acceleration capacity.

This can help when the machine needs rapid movement from one position to another.

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19.4 Low Rotor Inertia

The approximately 0.00147 kg·m² rotor inertia supports dynamic operation.

The motor can be especially useful where the axis repeatedly accelerates and decelerates.

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19.5 High-Resolution Absolute Feedback

The single-turn absolute encoder provides high-resolution shaft position information.

This is valuable for accurate servo control and synchronized machine motion.

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19.6 Keyed Shaft

The keyed shaft provides a familiar mechanical interface for industrial machine builders.

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19.7 No-Brake Construction

The absence of an integral brake can simplify applications where no holding brake is required.

It also avoids adding the mass and mechanical complexity of a brake assembly.

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19.8 Rotatable Right-Angle Connector

The connector design makes cable routing more flexible.

This is particularly useful in compact machine layouts.

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19.9 165 mm Frame

The 165 mm frame provides a useful balance between torque capacity and physical size.

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20. Typical Applications

20.1 Packaging Machinery

The MPL-B540K-SJ72AA is well suited to packaging machines requiring fast, repeatable servo movement.

Typical uses include:

• Product indexing
• Feed mechanisms
• Cutting systems
• Film transport
• Labeling systems
• Carton handling
• Rotary packaging mechanisms
• High-speed positioning

The 4000 rpm capability is particularly useful when machine cycle time is important.

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21. Material Handling

Material-handling equipment often requires controlled movement rather than simple continuous rotation.

The motor can be used in:

• Conveyor positioning
• Transfer units
• Automated storage mechanisms
• Pick-and-place systems
• Rotary transfer mechanisms
• Linear positioning systems

The high peak torque capability can be useful when loads must be accelerated rapidly.

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22. Ball-Screw Positioning

The motor is well suited to ball-screw applications.

A servo motor can rotate a ball screw through a coupling or other transmission arrangement, producing precise linear movement.

Typical applications include:

• CNC-style positioning axes
• Automated inspection systems
• Assembly equipment
• Linear slides
• Cutting systems
• Drilling systems
• Dispensing systems
• Precision positioning tables

The exact linear speed depends on screw pitch, transmission ratio, and motor speed.

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23. Machine Tool Applications

The motor can be used in selected machine-tool feed and positioning applications.

Potential uses include:

• Feed axes
• Tool positioning
• Rotary positioning
• Workpiece positioning
• Auxiliary axes
• Automated fixture positioning

The 4000 rpm capability can be advantageous where the machine requires fast axis movement.

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24. Automated Assembly

Automated assembly machines frequently use servo motors for controlled positioning.

The MPL-B540K-SJ72AA can be considered for:

• Part insertion
• Component positioning
• Rotary indexing
• Fixture movement
• Press positioning
• Inspection positioning
• Pick-and-place mechanisms
• Precision feeding

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25. Printing and Converting

Printing and converting equipment often requires synchronized high-speed motion.

Potential applications include:

• Feed rollers
• Positioning rollers
• Cutting mechanisms
• Registration axes
• Web-handling systems
• Rotary positioning

The motor’s high-speed capability and absolute feedback make it suitable for many controlled rotary-motion tasks.

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26. Electronic Assembly Equipment

Electronic assembly machinery typically requires fast movement with repeatable positioning.

The low-inertia motor design is useful in applications where the axis must rapidly move, stop, and settle.

Potential applications include:

• Component handling
• Assembly positioning
• Inspection stations
• Precision indexing
• Automated fixtures
• Small linear stages

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27. Five Related or Same-Series Models

The following models are closely related to the MPL-B540K-SJ72AA and are useful when selecting different feedback, brake, or shaft configurations.

Model	Speed	Output	Continuous Torque	Peak Torque	Feedback	Shaft	Brake	Frame / Stack	Weight
MPL-B540K-SJ74AA	4000 rpm	5.4 kW	19.4 N·m	48.6 N·m	Single-turn absolute	Keyed	24 V DC	165 / 101.6 mm	~19.1 kg
MPL-B540K-SK72AA	4000 rpm	5.4 kW	19.4 N·m	48.6 N·m	Single-turn absolute	Keyless	No brake	165 / 101.6 mm	~16.5 kg
MPL-B540K-SK74AA	4000 rpm	5.4 kW	19.4 N·m	48.6 N·m	Single-turn absolute	Keyless	24 V DC	165 / 101.6 mm	~20 kg
MPL-B540K-MJ72AA	4000 rpm	5.4 kW	19.4 N·m	48.6 N·m	Multi-turn absolute	Keyed	No brake	165 / 101.6 mm	~15 kg
MPL-B540K-MK72AA	4000 rpm	5.4 kW	19.4 N·m	48.6 N·m	Multi-turn absolute	Keyless	No brake	165 / 101.6 mm	~15 kg

The B540K family includes both single-turn and multi-turn configurations, with keyed and keyless shaft options and versions with or without a 24 V brake.

The exact weight can vary with configuration, especially when a brake is included. The approximately 15 kg value is the family-level no-brake motor reference, while specific catalog configurations can be heavier.

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28. Five Popular Models from the Same Brand

The following models are useful comparisons across the broader MPL range.

Model	Maximum Speed	Output	Continuous Torque	Peak Torque	Rotor Inertia	Weight	Frame / Stack
MPL-B520K	4000 rpm	3.5 kW	10.7 N·m	23.2 N·m	0.000783 kg·m²	9.8 kg	165 mm / shorter stack
MPL-B540D	2000 rpm	3.4 kW	19.4 N·m	41.0 N·m	0.00147 kg·m²	15.0 kg	165 / 101.6 mm
MPL-B540K	4000 rpm	5.4 kW	19.4 N·m	48.6 N·m	0.00147 kg·m²	15.0 kg	165 / 101.6 mm
MPL-B560F	3000 rpm	5.5 kW	26.8 N·m	67.8 N·m	0.00213 kg·m²	20.2 kg	165 / 152.4 mm
MPL-B580F	3000 rpm	7.1 kW	34.0 N·m	87.0 N·m	0.00289 kg·m²	25.4 kg	Larger / 203.2 mm stack

The family performance data shows the progression from the B520K through B540D, B540K, B560F, and B580F in speed, torque, power, rotor inertia, and mass.

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29. MPL-B520K Comparison

The B520K is a smaller motor in the same general MPL family.

Parameter	MPL-B520K	MPL-B540K-SJ72AA
Maximum Speed	4000 rpm	4000 rpm
Rated Output	3.5 kW	5.4 kW
Continuous Torque	10.7 N·m	19.4 N·m
Peak Torque	23.2 N·m	48.6 N·m
Rotor Inertia	0.000783 kg·m²	0.00147 kg·m²
Weight	~9.8 kg	~15 kg

The B540K is preferable when the machine requires substantially greater torque and power while retaining the 4000 rpm operating class.

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30. MPL-B540D Comparison

The B540D is an interesting alternative because it provides the same approximate continuous torque level but operates at a lower speed.

Parameter	MPL-B540D	MPL-B540K-SJ72AA
Maximum Speed	2000 rpm	4000 rpm
Rated Output	3.4 kW	5.4 kW
Continuous Torque	19.4 N·m	19.4 N·m
Peak Torque	41.0 N·m	48.6 N·m
Rotor Inertia	0.00147 kg·m²	0.00147 kg·m²
Weight	~15 kg	~15 kg
Main Advantage	Lower-speed torque application	High-speed operation

If the machine requires 4000 rpm, the B540K is the more natural choice.

If the mechanical system is limited to 2000 rpm and prioritizes a lower-speed operating range, the B540D can be considered.

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31. MPL-B560F Comparison

The B560F is designed for a higher torque requirement.

Parameter	MPL-B540K-SJ72AA	MPL-B560F
Maximum Speed	4000 rpm	3000 rpm
Rated Output	5.4 kW	5.5 kW
Continuous Torque	19.4 N·m	26.8 N·m
Peak Torque	48.6 N·m	67.8 N·m
Rotor Inertia	0.00147 kg·m²	0.00213 kg·m²
Weight	~15 kg	~20.2 kg

The B560F provides more torque but operates at a lower maximum speed and has greater rotor inertia.

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32. MPL-B580F Comparison

The B580F is intended for still higher torque requirements.

Parameter	MPL-B540K-SJ72AA	MPL-B580F
Maximum Speed	4000 rpm	3000 rpm
Rated Output	5.4 kW	7.1 kW
Continuous Torque	19.4 N·m	34.0 N·m
Peak Torque	48.6 N·m	87.0 N·m
Rotor Inertia	0.00147 kg·m²	0.00289 kg·m²
Weight	~15 kg	~25.4 kg

The B580F is more appropriate when high torque takes priority over compactness and maximum speed.

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33. Why the MPL-B540K-SJ72AA Is Attractive

The model provides a particularly useful combination of:

• 5.4 kW output
• 4000 rpm speed
• 19.4 N·m continuous torque
• 48.6 N·m peak torque
• Low rotor inertia
• Single-turn absolute feedback
• 1024-cycle Sin/Cos feedback
• Hiperface protocol
• Keyed shaft
• No integral brake
• 165 mm frame
• 101.6 mm stack
• Rotatable right-angle connector
• IEC metric mounting
• Approximately 15 kg basic motor weight

These characteristics make it a practical choice for demanding servo axes that need high speed and precise single-turn position feedback.

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34. Servo Drive Compatibility

The exact motor specification identifies compatibility with several servo-drive families used within the same motion-control ecosystem, including drive families such as Kinetix 5500, Kinetix 6200/6500, Kinetix 6000, Kinetix 300, Kinetix 350, Kinetix 2000, Kinetix 7000, and Ultra 3000.

This compatibility makes the motor suitable for integrated industrial motion systems.

However, compatibility should always be checked against the exact drive catalog number, firmware requirements, feedback interface, motor current, voltage class, and motor configuration before commissioning.

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35. Mechanical Installation

The motor should be mounted on a rigid and accurately aligned machine surface.

Incorrect alignment between the motor shaft and the driven mechanism can cause:

• Excessive bearing loading
• Coupling wear
• Mechanical vibration
• Positioning errors
• Increased noise
• Premature component failure

The keyed shaft should be properly coupled to the driven mechanism, and the coupling should be selected according to the motor torque, speed, shaft dimensions, and allowable misalignment.

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36. Cable Installation

The right-angle connector provides flexibility, but cable routing remains important.

Servo cables should be routed so that they are:

• Protected from moving machine components
• Free from unnecessary sharp bends
• Protected from excessive mechanical tension
• Separated appropriately from high-noise power wiring
• Properly supported
• Protected against abrasion

Good cable installation is particularly important in machines with moving axes.

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37. Vertical-Axis Considerations

Because the MPL-B540K-SJ72AA has no integral brake, special attention is required for vertical applications.

A motor without a brake should not automatically be considered a load-holding device.

For vertical applications, the machine designer should evaluate:

• Load mass
• Gravity force
• Screw pitch
• Transmission ratio
• Counterbalance
• Mechanical brake
• Safety locking system
• Servo-off behavior
• Emergency-stop behavior

A separate holding system may be required.

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38. Maintenance

Regular maintenance should focus on the complete motion system rather than only the motor.

Recommended inspection points include:

• Motor mounting bolts
• Shaft coupling
• Key and keyway condition
• Feedback connector
• Motor power connector
• Cable condition
• Machine vibration
• Bearing noise
• Motor temperature
• Mechanical alignment
• Servo drive alarms
• Positioning accuracy

Because the motor has no shaft seal, the installation environment should also be checked for contamination or fluid exposure.

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39. Replacement Checklist

When replacing an existing MPL-B540K-SJ72AA, the following items should be checked carefully.

Replacement Item	Required Check
Model	MPL-B540K-SJ72AA
Voltage	400 V AC class
Speed	4000 rpm
Output	5.4 kW
Continuous Torque	19.4 N·m
Peak Torque	48.6 N·m
Feedback	Single-turn absolute
Feedback Resolution	1024 Sin/Cos cycles/rev
Protocol	Hiperface
Shaft	Keyed
Brake	None
Shaft Seal	None
Connector	SpeedTec DIN
Connector	Right-angle
Connector Rotation	180° rotatable
Frame	165 mm
Stack	101.6 mm
Weight	Approximately 15 kg
Mounting	IEC metric
Special Configuration	Standard SJ72AA configuration

The complete catalog number is important because the B540K family contains multiple combinations of feedback, shaft, and brake options.

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40. Recommended Model Selection

Application Requirement	Recommended Model
High-speed, keyed shaft, single-turn, no brake	MPL-B540K-SJ72AA
High-speed, keyed shaft, single-turn, brake	MPL-B540K-SJ74AA
High-speed, keyless shaft, single-turn, no brake	MPL-B540K-SK72AA
High-speed, keyless shaft, single-turn, brake	MPL-B540K-SK74AA
High-speed, keyed shaft, multi-turn, no brake	MPL-B540K-MJ72AA
High-speed, keyless shaft, multi-turn, no brake	MPL-B540K-MK72AA
Lower-power high-speed application	MPL-B520K
Lower-speed higher-torque application	MPL-B540D
Higher continuous torque	MPL-B560F
Much higher torque	MPL-B580F

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41. Main Advantages Summary

Advantage	Description
4000 rpm Speed	Suitable for high-speed machinery
5.4 kW Output	Suitable for demanding servo axes
19.4 N·m Continuous Torque	Strong continuous load capability
48.6 N·m Peak Torque	High acceleration and transient torque capacity
Low Rotor Inertia	Fast dynamic response
Single-Turn Absolute Feedback	Accurate within-one-revolution position feedback
1024 Sin/Cos Resolution	High-resolution feedback
Hiperface Protocol	Industrial servo feedback interface
Keyed Shaft	Conventional mechanical interface
No Brake	Suitable for applications not requiring a motor brake
165 mm Frame	Good size-to-performance balance
101.6 mm Stack	B540K frame-5 construction
Rotatable Connector	Flexible cable routing
IEC Metric Mounting	Convenient for metric machine construction

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42. Complete Technical Summary

Category	Specification
Model	MPL-B540K-SJ72AA
Brand	Allen-Bradley
Product Series	MP-Series MPL
Motor Type	Low-Inertia Brushless Servo Motor
Voltage Class	400 V AC
Frame Size	Frame 5
Frame Dimension	165 mm
Magnet Stack	101.6 mm
Rated Speed	4000 rpm
Maximum Speed	4000 rpm
Rated Output	5.4 kW
Continuous Stall Torque	19.4 N·m
Peak Torque	48.6 N·m
Continuous Stall Current	Approximately 20.5 A
Rotor Inertia	Approximately 0.00147 kg·m²
Feedback	Absolute single-turn
Feedback Resolution	1024 Sin/Cos cycles/rev
Feedback Protocol	Hiperface
Shaft	Keyed
Shaft Seal	No
Brake	None
Connector	SpeedTec DIN
Connector Orientation	Right angle
Connector Rotation	180°
Mounting	IEC metric
Mounting Holes	Free mounting holes, Type FF
Operating Temperature	Up to 40 °C
Approximate Weight	15 kg
Primary Application	Industrial servo motion
Main Strength	High-speed, high-torque precision motion

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43. Final Product Assessment

The MPL-B540K-SJ72AA is a strong choice for industrial applications requiring a combination of high rotational speed, substantial servo torque, low rotor inertia, and high-resolution single-turn absolute feedback.

Its 5.4 kW output, 4000 rpm speed, 19.4 N·m continuous torque, and 48.6 N·m peak torque provide a useful performance range for demanding automation machinery.

The 165 mm frame and 101.6 mm magnet stack give the motor a compact industrial form relative to its torque capability.

The single-turn absolute feedback configuration is one of the defining characteristics of this particular model. The 1024 Sin/Cos feedback arrangement and Hiperface protocol make it suitable for applications where accurate servo position feedback is required.

The keyed shaft is convenient for conventional mechanical transmission systems, while the right-angle rotatable DIN connector provides useful flexibility during installation.

The absence of an integral brake makes the model particularly suitable for horizontal servo axes and other applications where a holding brake is not required. For vertical or gravity-loaded machinery, an independent load-holding solution should be evaluated.

Overall, the MPL-B540K-SJ72AA is best viewed as a high-speed, 5.4 kW, frame-5 low-inertia servo motor designed for demanding industrial motion applications where precise single-turn feedback, high speed, strong torque, and conventional keyed mechanical transmission are important.