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Allen-Bradley MPL-B4560F-SK72AA Servo Motor – Technical Specifications, Applications, Advantages and Model Selection Guide

1. Product Overview

The Allen-Bradley MPL-B4560F-SK72AA is a low-inertia brushless AC servo motor from the MP-Series MPL Low-Inertia Servo Motor family.

It is a 460 V AC class servo motor with a 130 mm frame size, 152.4 mm magnet stack, and 3000 rpm rated speed.

The motor provides approximately 14.1 N·m continuous stall torque, approximately 34.4 N·m peak stall torque, and approximately 3.2 kW rated output power.

A key characteristic of this configuration is its single-turn high-resolution encoder combined with a keyless shaft extension.

Unlike the SJ74AA configuration, the SK72AA version has no integral holding brake and uses a keyless shaft arrangement. This makes it particularly suitable for machine axes where a keyless coupling or clamping connection is preferred and where a motor holding brake is not required.

The motor also uses a SpeedTEC DIN right-angle connector, which can be rotated through approximately 180 degrees. This arrangement provides useful flexibility for cable routing in compact machine structures.

The MPL-B4560F-SK72AA is intended for closed-loop industrial motion applications where controlled acceleration, repeatable positioning, speed regulation, and rapid dynamic response are required.

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2. Brand and Product Series

Item	Specification
Brand	Allen-Bradley
Product Family	MP-Series
Servo Motor Series	MPL Low-Inertia Servo Motors
Product Type	Brushless AC Rotary Servo Motor
Model	MPL-B4560F-SK72AA
Voltage Class	460 V AC class
Motor Type	Permanent-magnet brushless servo motor
Frame Size	130 mm
Stack Length	152.4 mm
Rated Speed	3000 rpm
Feedback	Single-turn high-resolution encoder
Shaft	Keyless shaft extension
Brake	No integral brake
Connector	SpeedTEC DIN, right-angle
Mounting	IEC metric
Mounting Holes	Free mounting holes, Type FF
Application	Industrial closed-loop motion control

The MPL-B4560F-SK72AA belongs to the same general B4560F motor class as several other MPL configurations, but its SK72AA configuration gives it a specific combination of single-turn feedback, keyless shaft, no brake, and SpeedTEC DIN connectivity.

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3. Detailed Technical Parameters

Parameter	MPL-B4560F-SK72AA Specification
Model	MPL-B4560F-SK72AA
Brand	Allen-Bradley
Series	MP-Series MPL Low-Inertia
Product Type	Brushless AC rotary servo motor
Voltage Class	460 V AC
Nominal Voltage Class	400/460 V AC class
Rated Speed	3000 rpm
Maximum Speed	3000 rpm
Continuous Stall Torque	14.1 N·m
Peak Stall Torque	34.4 N·m
Rated Output Power	3.2 kW
Rotor Inertia	0.00078 kg·m²
Frame Size	45 / 130 mm
Frame Diameter Class	130 mm (5.12 in.)
Magnet Stack Length	152.4 mm (6.0 in.)
Feedback	Single-turn high-resolution encoder
Feedback Resolution	1024 Sin/Cos cycles/rev class
Feedback Type	Absolute single-turn encoder
Feedback Interface	Hiperface-type
Shaft	Keyless shaft extension
Shaft Key	None
Shaft Seal	None in standard configuration
Brake	No integral brake
Connector	SpeedTEC DIN
Connector Style	Right-angle
Connector Rotation	180° rotatable
Mounting	IEC metric
Mounting Holes	Free mounting holes, Type FF
Motor Construction	Low-inertia permanent-magnet servo
Duty Type	Continuous-duty servo application
Approx. Motor Weight	6.80 kg
Approx. Mechanical Envelope	Approximately 305 × 229 × 255 mm class
Protection	Configuration dependent
Cooling	Natural/ambient cooling arrangement
Typical Drive System	Industrial servo drive
Main Application	Position, velocity and torque-controlled motion

The motor weight is approximately 6.80 kg for this configuration.

The dimensional envelope should be treated as an approximate installation reference. Exact flange dimensions, shaft geometry, connector clearance, mounting-hole dimensions, and cable-routing space should be confirmed from the applicable mechanical drawing before final machine construction.

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4. Model Number Interpretation

The model number MPL-B4560F-SK72AA identifies the motor family and its principal configuration.

Model Section	General Meaning
MPL	MPL low-inertia servo motor family
B	460 V AC class
45	Frame size 45 / approximately 130 mm
60	60-stack / 152.4 mm magnet stack
F	3000 rpm speed class
S	Single-turn high-resolution encoder
K	Keyless shaft extension
7	SpeedTEC DIN right-angle connector
2	No integral brake
AA	Standard catalog configuration designation

The most important difference between this model and brake-equipped or multi-turn versions is the combination of:

Single-turn encoder + keyless shaft + no brake.

This combination can simplify a servo axis where the mechanical transmission does not require a shaft key and where the machine does not need a motor-mounted holding brake.

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5. Product Introduction

The MPL-B4560F-SK72AA is designed for industrial machines that require accurate and repeatable rotary motion.

The motor operates as part of a closed-loop servo system. The servo drive receives position feedback from the motor encoder and continuously regulates motor current to control torque and speed.

This closed-loop arrangement allows the motor to perform controlled acceleration, deceleration, positioning, synchronization, and speed regulation.

The low-inertia design is particularly useful in applications involving frequent changes in speed.

Instead of being optimized only for constant-speed operation, the motor is intended for machine axes where the motor may repeatedly accelerate, decelerate, stop, reverse, and reposition.

The 3000 rpm operating class and approximately 14.1 N·m continuous torque rating provide a useful combination for medium-duty industrial motion applications.

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6. Low-Inertia Servo Construction

Low motor inertia is one of the most important characteristics of the MPL family.

The approximate rotor inertia of the B4560F motor is 0.00078 kg·m².

Lower rotor inertia allows the servo drive to change motor speed more quickly because less torque is required simply to accelerate the motor rotor itself.

This is particularly useful when:

• The machine performs frequent indexing.
• The axis accelerates and decelerates repeatedly.
• Short cycle times are required.
• High positioning responsiveness is important.
• The machine performs rapid reversals.
• Multiple axes must remain synchronized.

The motor’s low-inertia construction should nevertheless be evaluated together with the actual load inertia.

A very large external load can dominate the total reflected inertia even when the motor itself has relatively low inertia.

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7. Continuous Torque Capability

The MPL-B4560F-SK72AA provides approximately 14.1 N·m continuous stall torque.

Continuous torque is an important value for determining whether a servo motor can sustain the required load during normal operation.

For example, a conveyor may require relatively steady torque to overcome friction and material load, while a ball-screw axis may require continuous torque to maintain force against the machine load.

The motor should be selected based on the actual RMS torque requirement rather than only the maximum instantaneous torque.

A properly sized motor should have sufficient continuous torque margin for the complete operating cycle.

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8. Peak Torque Capability

The motor provides approximately 34.4 N·m peak stall torque.

Peak torque is useful during short-duration acceleration and deceleration.

A typical machine may operate at a relatively low steady-state torque but require substantially more torque when:

• Accelerating a heavy load.
• Rapidly changing speed.
• Reversing direction.
• Starting a high-inertia mechanism.
• Overcoming temporary load disturbances.
• Performing rapid indexing.

The peak torque capability therefore contributes to dynamic machine performance.

Peak torque should not be interpreted as a continuous operating rating.

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9. 3.2 kW Rated Output

The B4560F motor is in the 3.2 kW rated output class.

This provides a practical balance between motor size, continuous torque, speed, and machine performance.

The 3.2 kW rating is appropriate for many medium-duty servo axes, including positioning and material-handling mechanisms.

Motor selection should consider more than rated power.

The actual application should be evaluated for:

• Continuous torque
• Peak torque
• RMS torque
• Load inertia
• Acceleration time
• Deceleration time
• Operating speed
• Duty cycle
• Transmission efficiency
• Gear ratio
• Mechanical losses
• Environmental conditions

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10. Single-Turn High-Resolution Encoder

The MPL-B4560F-SK72AA uses a single-turn high-resolution encoder.

The encoder provides motor shaft position information to the servo drive.

This feedback allows the control system to regulate:

• Position
• Speed
• Acceleration
• Deceleration
• Torque
• Direction

High-resolution feedback is important for applications requiring repeatable positioning.

Typical examples include:

• Indexing machines
• Packaging systems
• Assembly equipment
• Cutting machinery
• Pick-and-place systems
• Material handling
• Electronic component positioning

The single-turn configuration provides position information within one motor revolution.

Applications requiring absolute multi-turn position information may be better served by an MPL configuration using multi-turn feedback.

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11. Keyless Shaft Extension

The SK72AA configuration uses a keyless shaft extension.

This is one of the most important mechanical differences between the SK72AA and keyed-shaft versions.

A keyless shaft can be advantageous when the machine uses:

• Clamp-style couplings
• Friction-locking hubs
• Precision clamping systems
• Special servo couplings
• High-precision mechanical interfaces
• Compact transmission arrangements

A keyless shaft can provide a clean mechanical interface and eliminate the need to align a coupling keyway.

The coupling selected for the motor must be suitable for the shaft diameter, torque, speed, axial load, radial load, and required alignment.

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12. No Integral Brake

The MPL-B4560F-SK72AA has no integral holding brake.

This configuration is suitable for axes where the motor does not need to mechanically hold the load after servo torque is removed.

Typical applications include:

• Horizontal positioning axes
• Conveyor drives
• Rotary indexing systems
• Feed mechanisms
• Belt-driven axes
• Non-gravity-loaded positioning systems
• Machines with an external mechanical brake

For vertical axes or gravity-loaded mechanisms, the absence of an integral brake must be considered carefully.

If the load can move due to gravity when motor torque is removed, the machine may require an external holding mechanism or a different servo motor configuration with an integrated brake.

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13. SpeedTEC DIN Connector

The motor uses a SpeedTEC DIN right-angle connector.

The connector can be rotated through approximately 180 degrees.

This provides additional installation flexibility and can make cable routing easier in compact machines.

The right-angle configuration can be particularly useful where a straight connector would interfere with:

• Machine covers
• Adjacent motors
• Linear guides
• Cable carriers
• Structural frames
• Electrical enclosures
• Moving machine components

Correct cable bend radius should always be maintained.

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14. Mechanical Dimensions

The B4560F family uses a 130 mm frame and 152.4 mm magnet stack.

Mechanical Parameter	Approximate Value
Frame Size	130 mm
Frame Class	45
Magnet Stack	152.4 mm
Stack Designation	60
Approx. Overall Envelope	305 × 229 × 255 mm class
Approx. Weight	6.80 kg
Shaft Configuration	Keyless
Shaft Key	None
Shaft Seal	None
Mounting	IEC metric
Mounting Holes	Type FF, free mounting holes
Connector	SpeedTEC DIN, right-angle
Connector Rotation	180°

The motor should be installed with adequate space around the connector and shaft.

The actual machine envelope should include additional clearance for cable routing and coupling installation.

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15. Electrical Characteristics

Electrical Parameter	Typical Value
Motor Voltage Class	460 V AC
Supply Type	3-phase AC servo drive
Rated Output	3.2 kW
Rated Speed	3000 rpm
Maximum Speed	3000 rpm
Continuous Stall Torque	14.1 N·m
Peak Stall Torque	34.4 N·m
Rotor Inertia	0.00078 kg·m²
Feedback	Single-turn high-resolution
Brake	None
Motor Type	Permanent-magnet AC servo

The actual current supplied to the motor is controlled by the servo drive.

Drive selection should be based on motor voltage, continuous current, peak current, feedback compatibility, motor identification parameters, and application duty cycle.

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16. Main Product Advantages

16.1 High Torque in a Compact Motor Class

The B4560F provides approximately 14.1 N·m continuous torque from a 130 mm frame.

This gives machine designers a relatively high torque capability without moving immediately into a substantially larger motor frame.

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16.2 Low Rotor Inertia

The low-inertia rotor design improves dynamic response.

This is valuable in machines where rapid acceleration and deceleration are part of the normal cycle.

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16.3 High-Resolution Position Feedback

The single-turn encoder provides precise motor shaft feedback.

This supports accurate servo positioning and speed regulation.

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16.4 Keyless Mechanical Interface

The keyless shaft can simplify mechanical integration when a clamp-type coupling is used.

It can also avoid some of the alignment considerations associated with keyed couplings.

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16.5 No Brake for Simpler Horizontal Axes

The absence of a brake reduces the motor configuration to the functions actually required by many horizontal axes.

This can be advantageous where a brake is unnecessary.

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16.6 Flexible Connector Orientation

The 180° rotatable right-angle connector allows the motor to be installed in different cable-routing orientations.

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16.7 3000 rpm Operating Class

The 3000 rpm speed class is suitable for a wide range of industrial positioning and rotary motion applications.

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17. Typical Industrial Applications

Packaging Machinery

The motor is suitable for packaging machines requiring synchronized and repeatable movement.

Typical applications include:

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

The low-inertia characteristics are particularly useful when the machine performs repeated short movements.

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18. Material Handling

Material-handling machinery often requires controlled speed and positioning.

Possible applications include:

• Conveyor drives
• Transfer mechanisms
• Feed systems
• Sorting mechanisms
• Automated handling equipment
• Product positioning
• Roller drives

The keyless shaft can be useful when the driven mechanism uses a clamping coupling or friction-locking hub.

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19. Assembly Automation

Assembly machines require repeatable motion and accurate positioning.

The MPL-B4560F-SK72AA can be considered for:

• Component insertion
• Automated fixtures
• Workpiece positioning
• Pick-and-place systems
• Assembly transfer axes
• Feeding systems
• Automated fastening equipment

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20. Electronics Manufacturing Equipment

High-resolution servo feedback can be useful for electronic manufacturing equipment.

Potential applications include:

• Component positioning
• Inspection mechanisms
• Precision transfer
• Semiconductor handling
• Test equipment
• Automated assembly
• Small-part positioning

Where the machine requires precise and repeatable movement but does not require a motor-mounted holding brake, the SK72AA configuration can be appropriate.

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21. Printing and Converting Equipment

Servo-controlled motion is widely used in printing and converting machinery.

The motor can be used for:

• Feed rollers
• Registration systems
• Cutting mechanisms
• Slitting mechanisms
• Web handling
• Synchronization axes
• Indexing mechanisms

The closed-loop feedback system allows the controller to maintain the required speed and position relationship between machine axes.

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22. Machine Tools

The motor can be used in machine-tool positioning and auxiliary motion systems.

Potential applications include:

• Ball-screw axes
• Feed mechanisms
• Rotary positioning
• Indexing systems
• Tool handling
• Workpiece positioning

For vertical axes, the lack of an integral brake must be evaluated carefully.

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23. Textile Machinery

Textile equipment often requires synchronized and repeatable rotary motion.

Possible applications include:

• Feed rollers
• Tension-control mechanisms
• Cutting mechanisms
• Indexing systems
• Material feeding
• Roller synchronization

The 3000 rpm speed class provides a useful operating range for many textile machine axes.

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24. Conveyor and Feed Applications

The motor is well suited to controlled conveyor and feed applications where speed regulation and positioning are more important than simple constant-speed operation.

Examples include:

• Metering conveyors
• Product feeders
• Servo-driven rollers
• Indexing conveyors
• Transfer systems
• Automated sorting
• Material positioning

A keyless shaft can simplify the connection to appropriate servo couplings and pulley systems.

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25. Servo Drive Integration

The motor should be used with a compatible servo drive and motion-control system.

A typical installation includes:

1. Motion controller
2. Servo drive
3. Servo motor
4. Feedback cable
5. Motor power cable
6. Mechanical coupling
7. Driven machine mechanism

The servo drive receives feedback from the motor encoder and adjusts motor current according to the commanded motion.

This closed-loop control provides much better control of position and speed than a conventional open-loop motor arrangement.

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26. Servo Tuning

Servo tuning should be based on the complete mechanical system.

Important factors include:

• Motor inertia
• Load inertia
• Gear ratio
• Coupling stiffness
• Belt elasticity
• Ball-screw characteristics
• Mechanical resonance
• Backlash
• Friction
• Acceleration requirements
• Deceleration requirements

A low-inertia servo motor can respond quickly, but the machine’s mechanical structure must also be sufficiently rigid.

Excessively aggressive servo gains can result in:

• Vibration
• Overshoot
• Audible noise
• Position instability
• Mechanical resonance

Correct tuning should therefore be based on measured machine behavior rather than motor specifications alone.

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27. Load Inertia Considerations

Motor sizing should include the reflected load inertia.

For a direct-drive system, the load inertia is directly coupled to the motor.

For a geared system, the gear ratio changes the load inertia reflected to the motor.

A suitable gear ratio can therefore significantly improve servo performance.

For high-inertia applications, the designer should evaluate:

• Acceleration time
• Required peak torque
• Motor-to-load inertia ratio
• Gear reduction
• Mechanical stiffness
• Servo response
• Cycle time

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28. Thermal Performance

The motor’s thermal condition depends on the actual duty cycle.

Important variables include:

• Continuous torque
• RMS torque
• Peak current
• Ambient temperature
• Motor mounting
• Machine enclosure
• Operating speed
• Acceleration frequency
• Cooling conditions

A motor that operates close to its continuous torque rating for long periods should receive particular attention during thermal sizing.

Adequate machine-frame heat transfer and appropriate installation clearances should be maintained.

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29. Environmental and Installation Considerations

The motor should be installed in an environment appropriate for the selected configuration.

Considerations include:

• Ambient temperature
• Humidity
• Dust
• Oil exposure
• Water exposure
• Vibration
• Shock
• Chemical exposure
• Cable routing
• Mechanical impact

The standard keyless configuration does not include a shaft key or shaft seal.

If the shaft is exposed to liquids or contamination, the machine designer should evaluate whether an appropriate shaft-sealing arrangement or different motor configuration is required.

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30. Keyless Shaft Versus Keyed Shaft

The keyless shaft is an important reason to select the SK72AA configuration.

Feature	Keyless Shaft	Keyed Shaft
Mechanical Connection	Clamp/friction-based	Key and coupling
Keyway Required	No	Yes
Coupling Type	Clamp-style preferred	Keyed coupling common
Alignment	Dependent on coupling design	Keyway alignment required
Mechanical Flexibility	High with suitable coupling	Conventional
Typical Use	Precision coupling systems	Standard industrial transmission
Model Example	MPL-B4560F-SK72AA	MPL-B4560F-SJ72AA

The correct choice depends on the machine’s transmission system.

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31. No-Brake Configuration Versus Brake Configuration

Feature	MPL-B4560F-SK72AA	MPL-B4560F-SJ74AA
Rated Speed	3000 rpm	3000 rpm
Continuous Torque	14.1 N·m	14.1 N·m
Peak Torque	34.4 N·m	34.4 N·m
Rated Power	3.2 kW	3.2 kW
Feedback	Single-turn	Single-turn
Shaft	Keyless	Keyed
Brake	No	24 V DC
Stack	152.4 mm	152.4 mm
Frame	130 mm	130 mm
Approx. Weight	6.80 kg	11.82 kg

The SK72AA is more suitable where a brake is unnecessary.

The SJ74AA is more suitable where the machine needs a motor-mounted 24 V DC holding brake and a keyed shaft.

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32. Five Same-Series or Closely Related Models

The following models are useful alternatives within the MPL family and are particularly relevant when comparing feedback, shaft, brake, and motor-size configurations.

Model	Rated Speed	Continuous Torque	Peak Torque	Rated Power	Feedback	Shaft	Brake	Dimensions / Frame	Approx. Weight
MPL-B4560F-SJ72AA	3000 rpm	14.1 N·m	34.4 N·m	3.2 kW	Single-turn high-resolution	Keyed	No	130 mm / 152.4 mm stack	Approx. 11.82 kg
MPL-B4560F-SJ74AA	3000 rpm	14.1 N·m	34.4 N·m	3.2 kW	Single-turn high-resolution	Keyed	24 V DC	130 mm / 152.4 mm stack	Approx. 11.82 kg
MPL-B4560F-MK72AA	3000 rpm	14.1 N·m	34.4 N·m	3.2 kW	Multi-turn high-resolution	Keyless	No	130 mm / 152.4 mm stack	Approx. 6.80 kg class
MPL-B4560F-MK74AA	3000 rpm	14.1 N·m	34.4 N·m	3.2 kW	Multi-turn high-resolution	Keyless	24 V DC	130 mm / 152.4 mm stack	Approx. 9.07 kg class
MPL-B4540F-SK72AA	3000 rpm	10.2 N·m	27.1 N·m	2.6 kW	Single-turn high-resolution	Keyless	No	130 mm / 101.6 mm stack	Approx. 6–9 kg class

The MPL-B4540F-SK72AA is especially useful when the B4560F torque capacity is more than the application requires.

The B4560F variants are mechanically similar in frame and stack but differ in feedback, shaft, and brake configuration.

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33. Five Popular Allen-Bradley Servo Models for Comparison

Model	Rated Speed	Continuous Torque	Peak Torque	Rated Power	Feedback	Shaft	Brake	Approx. Dimensions / Frame	Approx. Weight
MPL-B430P-MJ74AA	5000 rpm	6.55 N·m	19.8 N·m	2.2 kW	Multi-turn high-resolution	Keyed	24 V DC	115 mm class	Approx. 5.5 kg
MPL-B4530F-MJ74AA	3000 rpm	8.25 N·m	20.3 N·m	2.1 kW	Multi-turn high-resolution	Keyed	24 V DC	130 mm / 76.2 mm stack	Approx. 7.3 kg
MPL-B4540F-MJ74AA	3000 rpm	10.2 N·m	27.1 N·m	2.6 kW	Multi-turn high-resolution	Keyed	24 V DC	130 mm / 101.6 mm stack	Approx. 8.6 kg
MPL-B4560F-MJ74AA	3000 rpm	14.1 N·m	34.4 N·m	3.2 kW	Multi-turn high-resolution	Keyed	24 V DC	130 mm / 152.4 mm stack	Approx. 11.82 kg
MPL-B540K-MJ74AA	4000 rpm	19.4 N·m	48.6 N·m	5.4 kW	Multi-turn high-resolution	Keyed	24 V DC	165 mm class	Approx. 15 kg class

These models cover a range of speed, torque, and power requirements.

The B430P is suitable for applications emphasizing higher speed and lower motor inertia.

The B4530F is appropriate for lower-torque axes.

The B4540F provides an intermediate torque level.

The B4560F provides significantly higher torque while retaining the 3000 rpm operating class.

The B540K moves into a larger and higher-power motor category.

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34. B4560F-SK72AA Versus B4560F-SJ72AA

These two motors have similar basic electrical performance but different shaft configurations.

Parameter	MPL-B4560F-SK72AA	MPL-B4560F-SJ72AA
Rated Speed	3000 rpm	3000 rpm
Continuous Torque	14.1 N·m	14.1 N·m
Peak Torque	34.4 N·m	34.4 N·m
Rated Power	3.2 kW	3.2 kW
Feedback	Single-turn	Single-turn
Shaft	Keyless	Keyed
Brake	No	No
Frame	130 mm	130 mm
Stack	152.4 mm	152.4 mm
Approx. Weight	6.80 kg	Approx. 11.82 kg

The SK72AA should be selected when the mechanical design favors a keyless shaft.

The SJ72AA should be considered when a conventional keyed shaft connection is required.

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35. B4560F-SK72AA Versus B4560F-MK72AA

The principal difference is the feedback system.

Parameter	MPL-B4560F-SK72AA	MPL-B4560F-MK72AA
Rated Speed	3000 rpm	3000 rpm
Continuous Torque	14.1 N·m	14.1 N·m
Peak Torque	34.4 N·m	34.4 N·m
Rated Power	3.2 kW	3.2 kW
Feedback	Single-turn	Multi-turn
Shaft	Keyless	Keyless
Brake	No	No
Frame	130 mm	130 mm
Stack	152.4 mm	152.4 mm
Approx. Weight	6.80 kg class	Approx. 6.80 kg class

If the application requires only single-turn position feedback, the SK72AA is the more direct configuration.

If absolute position information over multiple motor revolutions is required, the MK72AA configuration becomes more appropriate.

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36. Applications Best Suited to the SK72AA Configuration

The SK72AA configuration is particularly appropriate for applications with the following requirements:

• 460 V AC servo system
• 3000 rpm speed class
• Approximately 3.2 kW power
• Approximately 14.1 N·m continuous torque
• Approximately 34.4 N·m peak torque
• Single-turn high-resolution feedback
• Keyless shaft
• No integral motor brake
• 130 mm frame
• 152.4 mm stack
• Compact connector arrangement

This combination makes it a good candidate for horizontal machine axes, rotary indexing systems, conveyors, feed mechanisms, packaging equipment, and automated production machinery.

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37. Advantages for Machine Designers

The SK72AA configuration offers several practical machine-design advantages.

Reduced Mechanical Complexity

The keyless shaft eliminates the need for a shaft key and keyway in the motor-to-coupling interface.

Lower Motor Weight

Without an integral brake, the motor configuration is lighter than comparable brake-equipped versions.

High Dynamic Response

The low-inertia construction allows fast changes in motor speed.

Good Torque Density

The 14.1 N·m continuous torque rating is substantial for the 130 mm frame class.

Accurate Feedback

The single-turn high-resolution encoder supports precise servo control.

Flexible Cable Routing

The rotatable right-angle connector is useful in compact machine structures.

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38. Maintenance Considerations

Routine inspection should focus on the complete motor and mechanical transmission system.

Important inspection points include:

• Motor mounting bolts
• Shaft coupling
• Coupling alignment
• Bearing condition
• Encoder feedback
• Motor temperature
• Cable condition
• Connector condition
• Abnormal vibration
• Mechanical noise
• Load characteristics
• Machine backlash

Because this model does not contain an integral brake, brake maintenance is not required at the motor.

However, if the machine uses an external holding brake, that external brake should be inspected according to its own maintenance requirements.

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39. Cable Installation

Servo cable installation has a direct influence on system reliability.

The cable should be routed so that it does not experience unnecessary:

• Tensile loading
• Bending stress
• Crushing
• Abrasion
• Heat exposure
• Mechanical interference
• Excessive vibration

For moving applications, the cable carrier and cable-flexibility requirements should be considered during machine design.

The 180° rotatable right-angle connector can help position the cable in a more favorable direction.

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40. Machine Safety Considerations

Because the MPL-B4560F-SK72AA does not include an integral holding brake, machine designers should consider whether the driven mechanism can move when motor torque is removed.

For horizontal systems, this may not present a significant mechanical issue.

For vertical or gravity-loaded systems, an external mechanical holding method may be necessary.

Potential methods can include:

• External brake
• Mechanical locking mechanism
• Counterbalance
• Self-locking transmission
• Other machine-specific safety mechanisms

The appropriate solution depends on the actual machine design and applicable safety requirements.

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41. Selection Checklist

Before selecting the MPL-B4560F-SK72AA, verify the following:

Selection Item	Requirement
Supply Voltage	Compatible with 460 V AC class
Rated Speed	3000 rpm application
Continuous Torque	Application RMS torque below motor capability
Peak Torque	Acceleration/deceleration torque within motor capability
Rated Power	Approximately 3.2 kW class
Feedback	Single-turn encoder required
Shaft	Keyless mechanical connection required
Brake	No integral brake required
Frame	130 mm compatible
Stack	152.4 mm installation space available
Weight	Approximately 6.80 kg
Connector	SpeedTEC DIN compatible
Mounting	IEC metric
Environment	Suitable for motor configuration
Load Inertia	Compatible with servo tuning requirements
Mechanical Loads	Shaft radial and axial loads within limits

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42. Overall Product Position in the MPL Family

The MPL-B4560F-SK72AA occupies an important position within the B4560F segment of the MPL low-inertia servo family.

It provides more torque than the B4530F and B4540F configurations while maintaining the same general 130 mm frame and 3000 rpm operating class.

Its main distinction is not simply motor power.

The real selection advantage is the specific combination of:

3.2 kW + 3000 rpm + 14.1 N·m continuous torque + 34.4 N·m peak torque + single-turn high-resolution feedback + keyless shaft + no brake.

This makes it particularly suitable for machines that already have an external load-holding strategy or that do not require a brake.

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43. Quick Technical Summary

Item	MPL-B4560F-SK72AA
Brand	Allen-Bradley
Product Series	MP-Series MPL Low-Inertia
Motor Type	Brushless AC servo motor
Voltage Class	460 V AC
Rated Speed	3000 rpm
Maximum Speed	3000 rpm
Continuous Stall Torque	14.1 N·m
Peak Stall Torque	34.4 N·m
Rated Output	3.2 kW
Rotor Inertia	0.00078 kg·m²
Frame Size	130 mm
Magnet Stack	152.4 mm
Feedback	Single-turn high-resolution encoder
Encoder	1024 Sin/Cos class, absolute single-turn
Shaft	Keyless
Shaft Key	None
Shaft Seal	None
Brake	No integral brake
Connector	SpeedTEC DIN
Connector Type	Right-angle
Connector Rotation	180°
Mounting	IEC metric
Mounting Holes	Free mounting holes, Type FF
Approx. Dimensions	305 × 229 × 255 mm class
Approx. Weight	6.80 kg
Primary Application	Industrial servo motion control

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44. Final Product Assessment

The Allen-Bradley MPL-B4560F-SK72AA is a high-performance low-inertia servo motor designed for industrial motion-control systems requiring accurate feedback, fast dynamic response, and substantial torque from a relatively compact motor frame.

Its approximately 3.2 kW rated output, 14.1 N·m continuous torque, and 34.4 N·m peak torque make it suitable for a broad range of medium-duty servo axes.

The single-turn high-resolution encoder provides accurate feedback for closed-loop motion control.

The keyless shaft makes the model particularly attractive for applications using clamp-style couplings, friction-locking hubs, or other keyless mechanical transmission systems.

The absence of an integral brake keeps the configuration relatively simple and lightweight. This is an advantage for horizontal axes and other applications where a holding brake is not required.

The 130 mm frame and 152.4 mm stack provide a good balance between torque output and motor size.

The 3000 rpm speed class also makes the motor suitable for general industrial positioning, indexing, conveyor, packaging, assembly, and material-handling applications.

Compared with the B4560F-SJ72AA, the SK72AA uses a keyless shaft rather than a keyed shaft.

Compared with the B4560F-SJ74AA, the SK72AA eliminates the integral 24 V DC holding brake and changes the shaft configuration from keyed to keyless.

Compared with the B4560F-MK72AA, the major difference is the feedback configuration: the SK72AA uses single-turn high-resolution feedback, while the MK72AA is configured for multi-turn feedback.

For a machine that does not require a motor-mounted brake, does not require multi-turn position feedback, and benefits from a keyless mechanical connection, the MPL-B4560F-SK72AA is a practical configuration within the MPL B4560F family.

Final motor selection should be based on the complete motion profile, including continuous torque, RMS torque, peak acceleration torque, load inertia, operating speed, cycle time, shaft loading, mechanical transmission, ambient conditions, feedback requirements, and machine safety requirements.