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1. Product Overview

The Allen-Bradley MPL-B310P-SJ72AA is an MP-Series MPL low-inertia brushless AC rotary servo motor designed for industrial motion-control systems that require controlled speed, repeatable positioning, rapid acceleration and deceleration, and reliable closed-loop feedback.

This model is a 460 V / 480 V-class servo motor with a 100 mm frame, 25.4 mm magnet stack, and 5000 rpm maximum speed. It uses a single-turn high-resolution encoder for feedback, a keyed shaft extension, and a right-angle SpeedTEC DIN connector that can be rotated approximately 180 degrees. The motor configuration has no integrated brake.

The combination of a 100 mm frame and short 25.4 mm stack makes this motor useful where a machine needs a relatively compact servo motor while still requiring the performance characteristics of the larger MPL frame group.

Unlike a conventional induction motor, the MPL-B310P-SJ72AA is intended to operate as part of a complete servo system. The servo drive controls the motor while the feedback device continuously provides position information to the control system.

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2. Basic Product Parameters

Parameter	Specification
Model	MPL-B310P-SJ72AA
Brand	Allen-Bradley
Product Series	MP-Series MPL
Product Type	Low-Inertia Brushless AC Rotary Servo Motor
Motor Category	Industrial Servo Motor
Voltage Class	480 V AC class
Armature Voltage	460 V
Frame Size	100 mm
Frame Designation	Frame Size 3
Magnet Stack Length	25.4 mm
Stack Designation	10
Maximum Speed	5000 rpm
Rated Speed	5000 rpm
Feedback	Single-turn high-resolution encoder
Feedback Resolution	1024 Sin/Cos cycles/revolution
Feedback Protocol	Hiperface
Shaft Configuration	Keyed shaft extension
Shaft Key	Yes
Shaft Seal	No shaft seal
Brake	No brake
Connector	SpeedTEC DIN
Connector Style	Right-angle
Connector Rotation	180° rotatable
Mounting	IEC metric
Mounting Holes	Free mounting holes, Type FF
Continuous Rated Torque	Approx. 1.58 Nm
Peak Torque	Approx. 3.61 Nm
Continuous Rated Power	Approx. 0.77 kW
Rotor Inertia	Approx. 4.4 × 10⁻⁵ kg·m²
Dimensions	100 mm frame; 25.4 mm magnet stack; complete envelope depends on the mechanical drawing
Weight	Approx. 2.72 kg

The motor’s 100 mm frame, 25.4 mm stack, 5000 rpm rating, single-turn high-resolution encoder, keyed shaft, no-brake configuration, and SpeedTEC DIN connector are the principal identifying characteristics. Published technical data also lists approximately 1.58 Nm continuous torque, 3.61 Nm peak torque, 0.77 kW continuous rated power, and 4.4 × 10⁻⁵ kg·m² rotor inertia.

The weight figure of approximately 2.72 kg is a published product-data value and should be treated as a reference value for equipment planning rather than as a substitute for the exact shipping or assembled-machine weight.

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3. Brand

Brand: Allen-Bradley

The MPL-B310P-SJ72AA is part of the Allen-Bradley industrial motion-control product range.

For maintenance and purchasing purposes, the complete catalog number should be retained:

MPL-B310P-SJ72AA

The complete suffix is important because other motors in the same MPL family can have the same frame and stack but different feedback systems, shaft arrangements, brake options, or connector configurations.

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4. Product Series

Series: MP-Series MPL Low-Inertia Brushless Servo Motors

The MPL family is designed for industrial servo applications where controlled rotary motion is required.

The family includes multiple motor frame sizes, magnet-stack lengths, feedback options, shaft configurations, connector arrangements, and brake configurations.

The MPL-B310P-SJ72AA is positioned in the 100 mm frame / 25.4 mm stack / 5000 rpm configuration group.

The “S” feedback designation identifies the single-turn high-resolution encoder configuration, while the “J” identifies the keyed shaft arrangement. The “72” configuration is the no-brake version with the specified connector arrangement.

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5. Product Type

The MPL-B310P-SJ72AA is a:

Low-Inertia Brushless AC Rotary Servo Motor

It is designed for closed-loop motion control rather than simple constant-speed operation.

The motor normally works together with:

• Motion controller
• Servo drive
• Feedback system
• Motor power cable
• Feedback cable
• Mechanical coupling
• Machine load

The servo drive regulates current and motor motion while the encoder provides position feedback.

This arrangement allows the machine to control acceleration, deceleration, speed, position and coordinated movement.

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6. Model Number Explanation

The complete catalog number is:

MPL-B310P-SJ72AA

The major sections can be interpreted as follows.

Model Section	General Meaning
MPL	MPL low-inertia brushless servo motor family
B	480 V-class motor family
3	100 mm frame-size group
10	25.4 mm magnet stack
P	5000 rpm motor-speed designation
S	Single-turn high-resolution encoder
J	Keyed shaft extension
72	No-brake / connector configuration
AA	Specific catalog configuration

The exact catalog number should always be used when ordering a replacement.

A motor with a similar first five or six characters is not necessarily electrically or mechanically interchangeable.

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7. Detailed Technical Parameters

Technical Parameter	Specification
Model	MPL-B310P-SJ72AA
Brand	Allen-Bradley
Series	MP-Series MPL
Motor Type	Brushless AC servo
Voltage Class	480 V AC
Armature Voltage	460 V
Frame Size	100 mm
Magnet Stack	25.4 mm
Maximum Speed	5000 rpm
Rated Speed	5000 rpm
Feedback	Single-turn high-resolution encoder
Feedback Resolution	1024 Sin/Cos cycles/revolution
Feedback Protocol	Hiperface
Shaft Type	Keyed
Shaft Seal	None
Brake	None
Continuous Torque	Approx. 1.58 Nm
Peak Torque	Approx. 3.61 Nm
Continuous Power	Approx. 0.77 kW
Rotor Inertia	Approx. 4.4 × 10⁻⁵ kg·m²
Connector	SpeedTEC DIN
Connector Orientation	Right-angle
Connector Rotation	180°
Mounting	IEC metric
Mounting Holes	Type FF
Dimensions	100 mm frame / 25.4 mm stack
Weight	Approx. 2.72 kg

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8. Product Introduction

The MPL-B310P-SJ72AA is intended for automated machinery where the motor must follow controlled motion commands rather than simply run at a fixed speed.

Its low-inertia design is useful when the machine repeatedly accelerates and decelerates.

For example, an indexing machine may move from one position to another, stop, remain stationary for a short period, and then repeat the movement.

A servo motor is well suited to this type of operation because the control system can monitor motor position and continuously adjust the motor’s operation.

The MPL-B310P-SJ72AA combines this servo-control capability with a relatively compact 100 mm frame and short 25.4 mm magnet stack.

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9. Single-Turn High-Resolution Encoder

The feedback system is one of the most important characteristics of this motor.

The MPL-B310P-SJ72AA uses a single-turn high-resolution encoder.

Published technical information identifies the feedback as a 1024 Sin/Cos cycles-per-revolution encoder using the Hiperface protocol.

The encoder provides the servo drive with motor-position information.

This allows the control system to determine where the motor is rotating and to regulate the motor according to the commanded motion.

The single-turn configuration is different from a multi-turn encoder.

A single-turn encoder provides high-resolution position information within one mechanical revolution, while multi-turn systems additionally track the number of revolutions.

For replacement work, the feedback type must therefore be matched with the servo drive and machine configuration.

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10. High-Resolution Feedback Advantages

High-resolution feedback is useful when the machine requires precise motion control.

It can support:

• Accurate positioning
• Smooth speed regulation
• Controlled acceleration
• Controlled deceleration
• Repeatable indexing
• Coordinated multi-axis movement
• Reduced positioning error

The actual positioning accuracy of the machine, however, depends on the complete system.

Mechanical backlash, coupling flexibility, gearbox characteristics, screw accuracy, load inertia, servo tuning and controller resolution can all affect the final machine result.

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11. Keyed Shaft Extension

The MPL-B310P-SJ72AA uses a keyed shaft extension.

A keyed shaft provides a mechanical connection for a suitable coupling, pulley, gear, or other rotating component that uses a matching keyway.

This differs from the keyless shaft configuration used on models such as the SK variants.

The shaft arrangement should be matched to the machine’s existing mechanical transmission.

Important factors include:

• Shaft diameter
• Shaft length
• Key dimensions
• Coupling bore
• Radial load
• Axial load
• Maximum speed
• Alignment
• Coupling balance

A keyed motor should not automatically be substituted with a keyless motor unless the mechanical coupling is also changed appropriately.

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12. No-Brake Configuration

The MPL-B310P-SJ72AA is a no-brake motor.

There is no integrated 24 V DC holding brake in this configuration.

This makes the motor suitable for applications where mechanical holding through the motor is not required.

A no-brake configuration can simplify the motor-side electrical arrangement because there is no integrated brake coil to control.

However, it also means that the motor should not be selected for an application that specifically depends on an integrated motor brake unless a suitable external mechanical holding arrangement is provided.

For vertical axes, this distinction is particularly important.

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13. 100 mm Frame

The motor uses a 100 mm frame.

The frame size determines the general mechanical envelope and mounting arrangement.

It also affects:

• Flange dimensions
• Mounting-hole arrangement
• Shaft centerline
• Motor housing size
• Installation clearance
• Coupling position
• Machine support requirements

The 100 mm frame places this motor in a larger frame class than the smaller 75 mm MPL motors.

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14. 25.4 mm Magnet Stack

The motor uses a 25.4 mm magnet stack.

This corresponds to the “10” stack designation in the model number.

The short stack is useful where axial installation space is limited.

It allows the motor to use a 100 mm frame while keeping the active motor stack relatively short.

The stack length should not be confused with the complete motor length.

The total installed envelope also includes the flange, shaft extension, rear housing, connector and cable clearance.

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15. 5000 RPM Speed

The MPL-B310P-SJ72AA is rated for 5000 rpm.

This makes it suitable for a wide range of relatively high-speed industrial motion applications.

Typical applications include:

• Rotary indexing
• Packaging rollers
• Feed mechanisms
• Machine-tool auxiliary axes
• Automated assembly
• Printing equipment
• Inspection machinery
• Material handling
• Rotary positioning

The machine’s actual operating speed should be selected according to the load, torque, duty cycle and mechanical transmission.

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16. Torque and Power

Published product information gives approximately:

• Continuous torque: 1.58 Nm
• Peak torque: 3.61 Nm
• Continuous rated power: 0.77 kW

These values provide a useful reference when determining whether the motor is appropriate for a machine load.

The continuous torque rating is especially important for applications where the motor operates under a sustained load.

Peak torque becomes important during acceleration, deceleration, short-duration overloads and other dynamic portions of the machine cycle.

The motor should be sized according to the actual motion profile rather than simply comparing the peak torque number.

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17. Rotor Inertia

The published rotor inertia is approximately:

4.4 × 10⁻⁵ kg·m²

Low rotor inertia is useful for dynamic servo applications.

When a machine requires rapid acceleration and deceleration, motor inertia becomes an important part of the overall servo-system calculation.

The load inertia must also be considered.

A motor with low rotor inertia does not automatically guarantee fast machine response if the connected mechanical load is very large.

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18. Dimensions

The primary mechanical dimensions associated with the model are:

• 100 mm frame
• 25.4 mm magnet stack

Mechanical Parameter	Specification
Model	MPL-B310P-SJ72AA
Frame Size	100 mm
Frame Designation	3
Magnet Stack	25.4 mm
Stack Designation	10
Shaft	Keyed
Shaft Seal	None
Mounting	IEC metric
Mounting Hole Style	Type FF
Connector	Right-angle SpeedTEC DIN
Connector Rotation	180°
Overall Motor Envelope	Verify against applicable mechanical drawing
Frame Width Class	100 mm
Weight	Approx. 2.72 kg

For actual machine design, the complete mechanical drawing should be used instead of treating the 100 mm frame and 25.4 mm stack as the complete outside dimensions.

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19. Weight

The published product information gives a reference weight of approximately:

2.72 kg

This is useful for machine design, motor mounting, transportation and maintenance planning.

The actual shipping package weight will naturally be higher because it can include packaging, cables, accessories and protective materials.

When calculating machine-module weight, the motor should be considered together with the coupling and driven mechanism.

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20. Electrical Parameters

Electrical Parameter	Specification
Model	MPL-B310P-SJ72AA
Voltage Class	480 V AC
Armature Voltage	460 V
Continuous Power	Approx. 0.77 kW
Continuous Torque	Approx. 1.58 Nm
Peak Torque	Approx. 3.61 Nm
Rated Speed	5000 rpm
Maximum Speed	5000 rpm
Feedback	Single-turn high-resolution encoder
Feedback Resolution	1024 Sin/Cos cycles/revolution
Feedback Protocol	Hiperface
Brake	No brake
Rotor Inertia	Approx. 4.4 × 10⁻⁵ kg·m²
Dimensions	100 mm frame / 25.4 mm stack
Weight	Approx. 2.72 kg

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21. Mechanical Parameters

Mechanical Parameter	Specification
Model	MPL-B310P-SJ72AA
Frame Size	100 mm
Magnet Stack Length	25.4 mm
Shaft Configuration	Keyed
Shaft Seal	No shaft seal
Mounting Standard	IEC metric
Mounting Holes	Free mounting holes, Type FF
Connector	SpeedTEC DIN
Connector Position	Right angle
Connector Rotation	180°
Brake	None
Dimensions	100 mm frame / 25.4 mm stack
Weight	Approx. 2.72 kg

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22. Connector Configuration

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

The connector is designed to provide installation flexibility in industrial machinery.

Its approximately 180-degree rotational capability allows the connector orientation to be adjusted to suit the available cable-routing space.

This can be particularly useful where the motor is mounted close to a machine wall, guard, gearbox, or structural frame.

Cable routing should still provide sufficient bending radius and should avoid placing excessive mechanical stress directly on the connector.

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23. Main Product Advantages

23.1 Low-Inertia Construction

The low-inertia design allows the motor to respond quickly to changes in motion commands.

This is useful for equipment with frequent acceleration and deceleration.

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23.2 5000 RPM Capability

The 5000 rpm rating provides a useful speed range for high-cycle machinery.

It is suitable for many rotary positioning and continuous-motion applications.

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23.3 High-Resolution Encoder

The single-turn high-resolution encoder provides detailed position feedback.

This supports accurate closed-loop control when the complete servo system is properly configured.

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23.4 Keyed Shaft

The keyed shaft is convenient for machines using conventional keyed couplings, pulleys or other keyed mechanical transmission components.

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23.5 Compact 25.4 mm Stack

The short stack is useful where axial space is limited.

It gives the designer a 100 mm frame motor without requiring the longer stack associated with larger motor configurations.

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23.6 No-Brake Configuration

The absence of an integrated brake simplifies applications where shaft holding is not required.

It also eliminates the need for brake-coil wiring at the motor.

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23.7 Flexible Connector Orientation

The right-angle connector and rotational flexibility make the motor easier to integrate into compact machine layouts.

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24. Typical Applications

24.1 Packaging Machinery

Packaging machines frequently require rapid and repeatable motion.

The motor can be used for:

• Feed rollers
• Product indexing
• Cutting mechanisms
• Rotary positioning
• Material feeding
• Packaging film movement
• Conveyor synchronization

The 5000 rpm speed capability can be useful for high-cycle machines.

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24.2 Automated Assembly Equipment

Automated assembly machines often need precise movement between stations.

Possible applications include:

• Rotary indexing
• Assembly fixtures
• Feed mechanisms
• Transfer mechanisms
• Tool positioning
• Component handling

The encoder feedback allows the motion controller to monitor motor position.

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24.3 Material Handling

Servo-controlled material-handling systems can use the motor for controlled rotary movement.

Examples include:

• Conveyor mechanisms
• Transfer systems
• Rotary feeders
• Positioning units
• Automated handling equipment

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24.4 Printing and Converting Machinery

Printing and converting machines often require coordinated movement between several axes.

Servo motors can be used for:

• Rollers
• Feed systems
• Web handling
• Cutting mechanisms
• Registration systems
• Rotary positioning

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24.5 Machine Tools

The motor can be considered for suitable auxiliary rotary axes and machine mechanisms requiring controlled speed and position.

The exact application depends on the required torque, speed, duty cycle and mechanical arrangement.

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24.6 Inspection Equipment

Inspection equipment can use servo motors to move components through repeatable inspection positions.

Typical applications include:

• Rotary inspection fixtures
• Indexing stations
• Camera positioning
• Test fixtures
• Material positioning systems

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24.7 Automated Production Lines

The motor can be integrated into production-line equipment where several axes must operate according to programmed motion sequences.

The encoder feedback allows the servo system to maintain controlled motor movement.

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25. Application Comparison

Application	Main Benefit	Typical Motion Requirement	Dimensions	Weight
Packaging	Fast servo response	Indexing and high-cycle movement	100 mm / 25.4 mm	Approx. 2.72 kg
Assembly	Repeatable positioning	Start-stop positioning	100 mm / 25.4 mm	Approx. 2.72 kg
Material Handling	Controlled speed	Conveyor and transfer motion	100 mm / 25.4 mm	Approx. 2.72 kg
Printing	Coordinated motion	Roller and web control	100 mm / 25.4 mm	Approx. 2.72 kg
Inspection	Accurate positioning	Rotary indexing	100 mm / 25.4 mm	Approx. 2.72 kg
Machine Tools	Closed-loop control	Rotary auxiliary motion	100 mm / 25.4 mm	Approx. 2.72 kg
Production Lines	Repeatable motion	Multi-axis automation	100 mm / 25.4 mm	Approx. 2.72 kg

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26. Servo Drive Compatibility

The MPL-B310P-SJ72AA should be used with a compatible servo drive capable of handling its voltage, power, speed and feedback requirements.

Because this motor uses a single-turn high-resolution encoder with Hiperface feedback, the drive’s feedback interface must be compatible with that configuration.

The following should be checked before installation:

• Motor catalog number
• Voltage class
• Feedback type
• Feedback protocol
• Encoder interface
• Motor speed
• Motor current
• Torque requirements
• Servo drive capacity
• Motor cable
• Feedback cable

A motor should not be considered compatible simply because its mounting dimensions are the same as the existing motor.

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27. Mechanical Replacement Considerations

When replacing another motor with the MPL-B310P-SJ72AA, the following mechanical features should be checked.

Frame

The motor uses a 100 mm frame.

Stack

The motor uses a 25.4 mm magnet stack.

Shaft

The shaft is keyed.

Brake

There is no integrated brake.

Connector

The connector is a right-angle SpeedTEC DIN type.

Mounting

The mounting arrangement uses IEC metric dimensions and Type FF free mounting holes.

These characteristics should be matched before installation.

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28. Encoder Versus Resolver

The MPL-B310P-SJ72AA should not be confused with resolver-based MPL motors.

The SJ72AA configuration uses a single-turn high-resolution encoder.

Resolver versions use a different feedback technology.

The difference matters because the servo drive must interpret the feedback correctly.

A motor can have identical frame dimensions and a similar speed rating but still require a different drive configuration because of its feedback device.

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29. Keyed Versus Keyless Shaft

The J configuration indicates the keyed shaft arrangement.

Related K versions use a keyless shaft.

Feature	Keyed Version	Keyless Version
Shaft Type	Keyed	Keyless
Coupling	Keyed coupling	Clamping/keyless coupling
Mechanical Replacement	Requires matching keyway	Requires compatible clamping system
Main Consideration	Key and keyway alignment	Clamping force and shaft friction
Example	MPL-B310P-SJ72AA	MPL-B310P-SK72AA
Dimensions	100 mm frame / 25.4 mm stack	100 mm frame / 25.4 mm stack
Weight	Approx. 2.72 kg reference	Verify exact model weight

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30. Brake Versus No-Brake Configuration

The MPL-B310P-SJ72AA is the no-brake configuration.

A closely related SJ74AA version adds a 24 V DC brake.

Parameter	MPL-B310P-SJ72AA	MPL-B310P-SJ74AA
Frame	100 mm	100 mm
Stack	25.4 mm	25.4 mm
Speed	5000 rpm	5000 rpm
Feedback	Single-turn high-resolution encoder	Single-turn high-resolution encoder
Shaft	Keyed	Keyed
Brake	None	24 V DC
Connector	SpeedTEC DIN	SpeedTEC DIN
Dimensions	100 mm / 25.4 mm	100 mm / 25.4 mm
Weight	Approx. 2.72 kg reference	Verify exact model weight

The two models are very closely related, but the brake difference can affect machine wiring, control logic, mechanical holding and replacement suitability. The SJ74AA model is a documented catalog configuration.

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31. Five Related or Same-Series Models

The following five models are useful references when comparing the MPL-B310P-SJ72AA with closely related MPL configurations.

Model	Product Type	Voltage Class	Frame / Stack	Speed	Feedback	Shaft	Brake	Dimensions	Weight
MPL-B310P-SJ74AA	MPL low-inertia servo	480 V class	100 mm / 25.4 mm	5000 rpm	Single-turn high-resolution encoder	Keyed	24 V DC	100 mm / 25.4 mm	Verify exact model weight
MPL-B310P-SK72AA	MPL low-inertia servo	480 V class	100 mm / 25.4 mm	5000 rpm	Single-turn high-resolution encoder	Keyless	No brake	100 mm / 25.4 mm	Verify exact model weight
MPL-B310P-SK74AA	MPL low-inertia servo	480 V class	100 mm / 25.4 mm	5000 rpm	Single-turn high-resolution encoder	Keyless	24 V DC	100 mm / 25.4 mm	Verify exact model weight
MPL-B310P-RJ72AA	MPL low-inertia servo	480 V class	100 mm / 25.4 mm	5000 rpm	Resolver	Keyed	No brake	100 mm / 25.4 mm	Verify exact model weight
MPL-B310P-RK72AA	MPL low-inertia servo	480 V class	100 mm / 25.4 mm	5000 rpm	Resolver	Keyless	No brake	100 mm / 25.4 mm	Verify exact model weight

These models are closely related because they share the same 100 mm frame and 25.4 mm stack configuration while differing mainly in feedback technology, shaft style and brake option. The listed catalog combinations are represented within the MPL-B310P product family.

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32. Five Same-Brand Common MPL Models

The following models are useful additional references from the same MPL servo family.

They should be treated as comparison models rather than automatic replacements.

Model	Product Type	Voltage Class	Frame / Stack	Speed Class	Feedback	Shaft	Brake	Dimensions	Weight
MPL-B210V-VJ72AA	MPL low-inertia servo	480 V class	75 mm class / 25.4 mm	8000 rpm class	High-resolution feedback	Keyed	No brake	75 mm class / 25.4 mm	Verify exact model weight
MPL-B220T-VJ72AA	MPL low-inertia servo	480 V class	75 mm class / 50.8 mm	6000 rpm class	High-resolution feedback	Keyed	No brake	75 mm class / 50.8 mm	Verify exact model weight
MPL-B230P-VJ74AA	MPL low-inertia servo	480 V class	75 mm class / 76.2 mm	5000 rpm class	High-resolution feedback	Keyed	24 V brake	75 mm class / 76.2 mm	Verify exact model weight
MPL-B320P-SJ72AA	MPL low-inertia servo	480 V class	100 mm / 50.8 mm	5000 rpm	Single-turn high-resolution encoder	Keyed	No brake	100 mm / 50.8 mm	Verify exact model weight
MPL-B330P-MJ72AA	MPL low-inertia servo	480 V class	100 mm / 76.2 mm	5000 rpm class	Multi-turn high-resolution encoder	Keyed	No brake	100 mm / 76.2 mm	Verify exact model weight

These models represent different frame, stack and feedback combinations within the same MPL product family. The B310P, B320P and B330P groups are particularly relevant when comparing motors around the 100 mm frame class.

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33. Comparison of the Closest B310P Models

Model	Feedback	Shaft	Brake	Frame	Stack	Speed	Dimensions	Weight
MPL-B310P-SJ72AA	Single-turn high-resolution encoder	Keyed	No	100 mm	25.4 mm	5000 rpm	100 mm / 25.4 mm	Approx. 2.72 kg
MPL-B310P-SJ74AA	Single-turn high-resolution encoder	Keyed	24 V DC	100 mm	25.4 mm	5000 rpm	100 mm / 25.4 mm	Verify exact weight
MPL-B310P-SK72AA	Single-turn high-resolution encoder	Keyless	No	100 mm	25.4 mm	5000 rpm	100 mm / 25.4 mm	Verify exact weight
MPL-B310P-SK74AA	Single-turn high-resolution encoder	Keyless	24 V DC	100 mm	25.4 mm	5000 rpm	100 mm / 25.4 mm	Verify exact weight
MPL-B310P-RJ72AA	Resolver	Keyed	No	100 mm	25.4 mm	5000 rpm	100 mm / 25.4 mm	Verify exact weight

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34. Why the Complete Model Number Matters

The MPL family contains many motors with very similar physical dimensions.

For example, several B310P models use:

• 100 mm frame
• 25.4 mm stack
• 5000 rpm

Yet they can have different feedback systems and shaft arrangements.

The difference between an encoder and resolver can affect servo-drive compatibility.

The difference between a keyed and keyless shaft can affect the mechanical coupling.

The difference between brake and no-brake can affect the machine’s electrical wiring and holding function.

Therefore, the complete catalog number should always be checked before ordering a replacement.

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35. Servo Tuning After Replacement

After installing an MPL-B310P-SJ72AA, the servo drive configuration should be checked.

Important settings can include:

• Motor identification
• Feedback type
• Encoder configuration
• Feedback resolution
• Motor speed
• Motor current
• Torque limits
• Acceleration
• Deceleration
• Position loop
• Velocity loop
• Electronic gearing
• Mechanical transmission ratio

The exact settings depend on the servo drive and machine control system.

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36. Load Inertia and Motion Performance

The motor’s low rotor inertia is useful for dynamic motion.

However, the connected load can be substantially larger than the motor rotor inertia.

The machine designer should evaluate the complete inertia ratio.

If the load is poorly matched, possible symptoms can include:

• Overshoot
• Excessive settling time
• Vibration
• Following errors
• Slow acceleration
• Excessive current
• Increased motor temperature

Correct motor sizing and servo tuning are therefore essential.

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37. Maintenance Considerations

When maintaining a machine containing this motor, the technician should record the complete model number:

MPL-B310P-SJ72AA

The following information should also be checked:

• Motor nameplate
• Servo drive model
• Encoder cable
• Motor cable
• Shaft coupling
• Mounting dimensions
• Motor parameters
• Machine axis configuration

This prevents an apparently similar motor from being installed without checking its feedback or mechanical characteristics.

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38. Installation Considerations

The motor should be mounted on a suitable, rigid surface.

The motor shaft should be correctly aligned with the driven component.

The keyed coupling should be correctly fitted.

Excessive radial or axial loading should be avoided.

The connector should have enough clearance for cable installation.

The feedback cable should be routed in a manner that minimizes exposure to electrical interference from high-power switching circuits.

Good mechanical alignment and proper cable routing are particularly important in servo applications.

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39. Typical Industries

The MPL-B310P-SJ72AA can be considered for machinery used in:

• Packaging
• Automated assembly
• Material handling
• Printing
• Converting
• Machine tools
• Inspection equipment
• General factory automation
• Production lines
• Rotary indexing
• Processing machinery
• Automated positioning systems

The actual application suitability depends on the required speed, torque, duty cycle, feedback system and mechanical load.

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40. Product Selection Guide

Requirement	MPL-B310P-SJ72AA Consideration	Dimensions	Weight
High-speed motion	5000 rpm	100 mm / 25.4 mm	Approx. 2.72 kg
Precise closed-loop motion	High-resolution encoder	100 mm / 25.4 mm	Approx. 2.72 kg
Keyed mechanical transmission	Keyed shaft	100 mm / 25.4 mm	Approx. 2.72 kg
Brake required	Not included	100 mm / 25.4 mm	Approx. 2.72 kg
Compact axial installation	25.4 mm stack	100 mm / 25.4 mm	Approx. 2.72 kg
High-cycle indexing	Low-inertia construction	100 mm / 25.4 mm	Approx. 2.72 kg
Resolver-based system	Not the preferred configuration	100 mm / 25.4 mm	Approx. 2.72 kg
Hiperface encoder system	Appropriate feedback configuration	100 mm / 25.4 mm	Approx. 2.72 kg

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41. Main Advantages for Machine Builders

The MPL-B310P-SJ72AA provides a useful combination of mechanical and electrical characteristics for automated machinery.

Its 100 mm frame provides a substantial mounting platform.

Its 25.4 mm stack helps control the motor’s axial installation space.

The 5000 rpm speed rating supports high-cycle rotary applications.

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

The keyed shaft works with conventional keyed mechanical couplings.

The no-brake configuration simplifies machines that do not require motor holding.

The right-angle SpeedTEC DIN connector can help with cable routing in compact machine layouts.

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42. Main Advantages for Maintenance Departments

From a maintenance perspective, the complete catalog number gives a clear starting point for identifying the correct replacement.

The model specifies an important combination of:

• 480 V-class motor
• 100 mm frame
• 25.4 mm stack
• 5000 rpm
• Single-turn high-resolution encoder
• Keyed shaft
• No brake

This makes the model distinguishable from related B310P motors.

For example, an SJ74AA motor has the same general encoder/keyed configuration but adds a brake, while SK72AA changes the shaft to a keyless configuration.

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43. Overall Technical Summary

Item	Specification
Model	MPL-B310P-SJ72AA
Brand	Allen-Bradley
Series	MP-Series MPL
Product Type	Low-Inertia Brushless AC Rotary Servo Motor
Voltage Class	480 V AC
Armature Voltage	460 V
Frame Size	100 mm
Magnet Stack	25.4 mm
Rated Speed	5000 rpm
Maximum Speed	5000 rpm
Continuous Torque	Approx. 1.58 Nm
Peak Torque	Approx. 3.61 Nm
Continuous Power	Approx. 0.77 kW
Feedback	Single-turn high-resolution encoder
Resolution	1024 Sin/Cos cycles/revolution
Protocol	Hiperface
Shaft	Keyed
Shaft Seal	None
Brake	No brake
Connector	SpeedTEC DIN
Connector Style	Right angle
Connector Rotation	180°
Mounting	IEC metric
Mounting Holes	Type FF
Rotor Inertia	Approx. 4.4 × 10⁻⁵ kg·m²
Dimensions	100 mm frame / 25.4 mm stack
Weight	Approx. 2.72 kg

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44. Final Product Description

The Allen-Bradley MPL-B310P-SJ72AA is a 480 V-class MP-Series MPL low-inertia brushless AC rotary servo motor designed for industrial motion-control applications.

Its main configuration consists of a 100 mm frame, 25.4 mm magnet stack, 5000 rpm rated speed, single-turn high-resolution encoder, keyed shaft extension, right-angle SpeedTEC DIN connector, and no integrated brake.

The motor provides approximately 1.58 Nm of continuous torque, 3.61 Nm of peak torque, and 0.77 kW of continuous rated power, making it suitable for a broad range of controlled rotary motion applications.

The single-turn high-resolution encoder is an important feature of this configuration. It provides detailed feedback information to the servo drive and supports accurate closed-loop speed and position control.

The keyed shaft makes the motor suitable for machinery using conventional keyed couplings and transmission components.

The absence of an integrated brake makes this version appropriate for applications where motor shaft holding is not required or where another mechanical holding arrangement is already provided.

The 25.4 mm stack gives the motor a relatively compact axial configuration for its 100 mm frame size.

The 5000 rpm speed capability makes the motor suitable for high-cycle machinery, while its low-inertia construction supports rapid acceleration and deceleration.

Typical applications include packaging machinery, automated assembly equipment, indexing systems, material handling, printing and converting machinery, inspection systems, machine tools, and general industrial automation.

For replacement purposes, the complete MPL-B310P-SJ72AA catalog number is important.

A related motor such as an SJ74AA may have a brake, while an SK72AA may have a keyless shaft. A resolver-equipped motor such as an RJ72AA uses a different feedback technology. These differences can affect both electrical compatibility and mechanical installation.

The motor’s reference weight is approximately 2.72 kg, while its principal dimensional classification is 100 mm frame with a 25.4 mm magnet stack.

In practical terms, the MPL-B310P-SJ72AA is a compact 100 mm-frame servo motor intended for applications where high-speed controlled motion, high-resolution single-turn feedback, keyed mechanical transmission, low-inertia response, and closed-loop servo operation are required.