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Allen-Bradley MPL-B320P-SK72AA Low-Inertia Servo Motor

1. Product Overview

The Allen-Bradley MPL-B320P-SK72AA is a high-speed, low-inertia AC rotary servo motor designed for precision motion-control applications. It belongs to the MPL Low-Inertia Servo Motor Series and is configured for the 460 V class, with a 100 mm frame size, 50.8 mm magnet stack, 5000 rpm rated speed, single-turn high-resolution absolute encoder feedback, keyless shaft construction, and no integrated brake.

This particular configuration is intended for machines that require fast acceleration and deceleration, accurate positioning, repeatable motion, and a relatively low rotor inertia. The motor uses a SpeedTEC DIN right-angle connector with 180° rotation capability, allowing the connector orientation to be adapted to the available machine space.

The MPL-B320P-SK72AA is especially suitable when the machine does not require a holding brake. Removing the brake option keeps the motor configuration comparatively simple and makes it well suited to continuously rotating axes, horizontal motion axes, indexing systems, conveyors, packaging machinery, and other applications where an external mechanical holding mechanism is either unnecessary or handled separately.

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2. Brand and Product Series

Item	Specification
Brand	Allen-Bradley
Product Series	MPL Low-Inertia Servo Motor Series
Product Family	MP-Series MPL Servo Motors
Model	MPL-B320P-SK72AA
Motor Type	AC Rotary Servo Motor
Construction	Brushless Servo Motor
Voltage Class	400 V AC class / 460 V nominal configuration
Frame Size	100 mm
Magnet Stack	50.8 mm
Rated Speed	5000 rpm
Feedback	Single-turn high-resolution absolute encoder
Shaft	Keyless shaft extension
Brake	No brake
Connector	SpeedTEC DIN, right-angle, rotatable
Mounting	IEC metric flange mount
Shaft Seal	No
Approx. Dimensions	307.09 × 202.95 × 239.01 mm
Approx. Weight	3.65 kg

The MPL designation identifies a low-inertia servo motor family intended for dynamic motion control. The B320P configuration is positioned around a 100 mm frame and 50.8 mm magnet-stack length, giving it a useful combination of compact mechanical packaging, relatively high speed, and moderate continuous torque.

The exact SK72AA configuration is important because the final characters of the model number define several mechanical and electrical options. In particular, the “K” identifies the keyless shaft configuration, while the “72” configuration identifies the connector arrangement and the absence of a brake.

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3. Model Number Interpretation

The model number MPL-B320P-SK72AA can be understood as a combination of the motor family, voltage class, frame size, magnet-stack length, speed, feedback, shaft configuration, connector arrangement, and brake option.

Model Section	Meaning	Configuration
MPL	Product family	Low-Inertia Servo Motor
B	Voltage configuration	460 V class
3	Frame size	100 mm
20	Magnet stack	50.8 mm
P	Speed	5000 rpm
S	Feedback	Single-turn high-resolution encoder
K	Shaft	Keyless shaft extension
7	Connector	SpeedTEC DIN, right angle, 180° rotatable
2	Brake	No brake
AA	Factory/configuration suffix	Standard configuration

This coding system makes it possible to distinguish the SK72AA from closely related motors that use the same frame and stack size but have different shaft, encoder, or brake configurations.

For example, an SJ74AA configuration is closely related but uses a keyed shaft and a 24 V DC brake, while the SK72AA uses a keyless shaft and does not include a brake. That difference can be important when replacing an existing motor or selecting the correct motor for a new machine.

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4. Main Technical Parameters

Parameter	MPL-B320P-SK72AA Specification
Model	MPL-B320P-SK72AA
Brand	Allen-Bradley
Series	MPL Low Inertia
Motor Type	Rotary Servo Motor
Product Type	Brushless AC Servo Motor
Voltage	460 V nominal configuration
Voltage Class	400 V AC class
Rated Speed	5000 rpm
Maximum Speed	5000 rpm
Continuous Output Power	1.5 kW
Continuous Output Torque	3.05 Nm
Peak Output Torque	7.91 Nm
Rotor Inertia	7.8 × 10⁻⁵ kg·m²
Frame Size	100 mm
Magnet Stack Length	50.8 mm
Feedback Type	Absolute single-turn
Feedback Resolution	Sin/Cos, 1024 cycles/rev
Feedback Protocol	Hiperface
Shaft Configuration	Keyless
Shaft Seal	No
Brake	No brake
Connector	SpeedTEC DIN Type M7
Connector Orientation	Right angle
Connector Rotation	180° rotatable
Mounting	Metric flange mount
Operating Temperature, Maximum	40 °C
Approx. Dimensions	307.09 × 202.95 × 239.01 mm
Approx. Weight	3.65 kg
Mounting Hole Type	Free mounting holes, Type FF

The principal technical data identifies the MPL-B320P-SK72AA as a 1.5 kW, 5000 rpm servo motor with 3.05 Nm continuous torque and 7.91 Nm peak torque. Its feedback system is an absolute single-turn high-resolution encoder using 1024 Sin/Cos cycles per revolution with Hiperface protocol.

The published physical listing for this exact model gives an approximate weight of 8.05 lb, or about 3.65 kg. The listed package dimensions are approximately 30.709 × 20.295 × 23.901 cm. Actual installed clearance should still be checked against the mechanical drawing for the particular motor and connector orientation before designing the machine enclosure.

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5. Electrical Performance

The MPL-B320P-SK72AA provides 1.5 kW continuous rated power, making it appropriate for medium-duty servo axes where fast movement and accurate positioning are more important than extremely high continuous torque.

Its continuous output torque is 3.05 Nm, while the peak output torque reaches approximately 7.91 Nm. This peak capability is useful during acceleration, deceleration, indexing, short-duration load changes, and other dynamic operating conditions.

The 5000 rpm speed rating is one of the major characteristics of the motor. High rotational speed can allow a machine designer to reduce cycle time or operate a mechanical transmission at a favorable ratio while retaining servo control.

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6. Torque Characteristics

Performance Item	Specification
Model	MPL-B320P-SK72AA
Continuous Torque	3.05 Nm
Peak Torque	7.91 Nm
Continuous Power	1.5 kW
Rated Speed	5000 rpm
Maximum Speed	5000 rpm
Rotor Inertia	0.000078 kg·m²
Brake	No
Dimensions	Approx. 307.09 × 202.95 × 239.01 mm
Weight	Approx. 3.65 kg

The 3.05 Nm continuous torque rating provides the basic working torque capability of the motor, while the 7.91 Nm peak torque gives the servo system additional short-term torque capacity.

When sizing this motor, the machine designer should not select the motor solely from the peak torque value. Continuous load torque, acceleration torque, reflected inertia, duty cycle, mechanical efficiency, ambient temperature, and servo-drive limits should all be considered.

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7. Feedback System

The MPL-B320P-SK72AA uses an absolute single-turn high-resolution encoder. The specified feedback resolution is 1024 Sin/Cos cycles per revolution, and the feedback protocol is Hiperface.

This feedback arrangement allows the servo drive to obtain accurate information about motor position and rotational movement. It is particularly useful in applications where repeatable positioning and controlled acceleration are required.

The single-turn characteristic means the feedback system is designed around absolute position information within one mechanical revolution. For applications requiring absolute position information across multiple revolutions after power cycling, a multi-turn encoder version may be more appropriate.

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8. Keyless Shaft Design

One of the defining characteristics of the SK72AA configuration is its keyless shaft extension.

A keyless shaft can provide a clean coupling interface when the selected coupling, clamping hub, or other mechanical transmission component is designed for a keyless servo shaft. This can be useful in high-speed applications where careful shaft alignment and balanced mechanical connections are important.

The absence of a traditional shaft key also means that the coupling arrangement must be selected correctly. The shaft diameter, usable shaft length, clamping force, permissible radial load, permissible axial load, and coupling manufacturer’s requirements should be checked before installation.

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9. No-Brake Configuration

The MPL-B320P-SK72AA is specifically configured with no brake. This is one of the most important differences between this model and brake-equipped versions of the same basic motor family.

A no-brake motor is often appropriate for axes that do not need the motor itself to hold the load when servo power is removed.

Typical examples include continuously rotating conveyor axes, rotary processing equipment, certain indexing mechanisms, fan or roller systems, and horizontal axes where the load can safely remain stationary through another mechanical arrangement.

For vertical axes, suspended loads, or machines requiring positive holding when power is removed, the absence of an integrated brake must be considered carefully. A separate holding mechanism may be required depending on the machine’s risk assessment and mechanical design.

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10. Connector Configuration

The motor uses a SpeedTEC DIN connector with a right-angle configuration and approximately 180° rotatable orientation.

This connector arrangement is particularly useful when motor cable routing is restricted by machine guards, panels, cable tracks, or adjacent mechanical components.

The ability to rotate the connector can help reduce unnecessary cable bending and can make the final machine layout cleaner.

During installation, sufficient clearance should be provided around the connector. The cable should not be forced into a sharp bend immediately at the connector body.

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11. Mechanical Mounting

The motor uses a metric flange mounting arrangement and has a 100 mm frame size. The published configuration specifies free mounting holes, Type FF.

The 100 mm frame provides a practical size for medium-duty servo axes. The 50.8 mm magnet-stack length gives the motor a relatively compact axial configuration compared with longer motors in the same general family.

When installing the motor, the flange face should be clean and properly aligned. The motor should not be forced into position by using the mounting bolts to compensate for shaft misalignment.

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12. Product Introduction

The MPL-B320P-SK72AA is designed around the concept of a low-inertia servo motor. The low-inertia rotor is advantageous in machines where the motor must repeatedly accelerate and decelerate.

In a high-cycle machine, the servo motor may change speed thousands of times during normal operation. A motor with a suitable low rotor inertia can respond quickly to commanded changes while maintaining controlled motion.

This makes the motor particularly suitable for applications such as packaging, indexing, converting, assembly, printing, inspection, and other automated production equipment.

The motor’s 5000 rpm speed capability also makes it suitable for machines where rapid rotational movement is important. Instead of relying only on high torque at low speed, the motor is intended to provide a balance of speed, torque, inertia, and feedback precision.

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13. Low-Inertia Design

The rotor inertia specified for the MPL-B320P-SK72AA is approximately 7.8 × 10⁻⁵ kg·m².

Low rotor inertia is particularly useful when the motor has to change speed frequently.

For example, consider a packaging machine that accelerates a roller, reaches operating speed, stops, reverses, and then accelerates again. A low-inertia motor can be advantageous because the servo system does not have to overcome as much motor rotor inertia during every acceleration and deceleration cycle.

This characteristic is one reason the MPL series is suitable for dynamic motion applications rather than simple constant-speed motor applications.

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14. Main Product Advantages

Advantage	Description
Model	MPL-B320P-SK72AA
High-Speed Operation	5000 rpm rated/maximum speed
Moderate Power	1.5 kW continuous output
Continuous Torque	3.05 Nm
Peak Torque	7.91 Nm
Low Rotor Inertia	Approx. 7.8 × 10⁻⁵ kg·m²
High-Resolution Feedback	1024 Sin/Cos cycles/rev
Absolute Feedback	Single-turn absolute encoder
Keyless Shaft	Suitable for compatible clamping couplings
No Brake	Simplified configuration for non-holding axes
Rotatable Connector	180° right-angle connector orientation
Metric Mounting	Convenient for metric machine construction
Compact Frame	100 mm frame
Compact Stack	50.8 mm magnet stack
Servo Compatibility	Suitable for compatible motion-control drive families
Approx. Dimensions	307.09 × 202.95 × 239.01 mm
Approx. Weight	3.65 kg

The combination of high speed, moderate continuous torque, low inertia, high-resolution feedback, and a compact 100 mm frame makes this motor particularly useful for dynamic machine axes.

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15. Typical Applications

Packaging Machinery

The MPL-B320P-SK72AA can be applied to packaging machines where accurate synchronization and fast cycle rates are required.

Possible applications include film-feeding mechanisms, indexing rollers, sealing mechanisms, product positioning, cutting mechanisms, and conveyor synchronization.

The 5000 rpm speed rating can be useful in high-cycle packaging equipment, while the absolute feedback system supports controlled positioning.

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Automated Assembly Equipment

Automated assembly equipment often contains multiple servo axes operating simultaneously.

The MPL-B320P-SK72AA can be used for positioning slides, rotary indexing tables, transfer mechanisms, pick-and-place systems, and other motion axes where fast response is required.

The keyless shaft can also be convenient where the machine uses precision clamping couplings rather than keyed couplings.

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Material Handling

The motor can be used for controlled rollers, conveyors, indexing mechanisms, and automated material-transfer systems.

A servo motor provides considerably more control over acceleration and deceleration than a conventional fixed-speed motor.

The no-brake configuration is particularly suitable for horizontal material-handling axes where a motor holding brake is not required.

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Printing Machinery

Printing equipment often requires synchronized motion between rollers, feeders, cutters, and other mechanical components.

The high-resolution feedback system of the MPL-B320P-SK72AA can support precise speed and position control.

Its high rotational speed is also useful for applications where the machine must maintain rapid roller movement.

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Converting Machinery

Converting equipment processes materials such as film, paper, foil, labels, and other flexible materials.

Typical servo applications include unwind systems, rewind systems, tension-control mechanisms, knife positioning, indexing rollers, and material-feeding systems.

In these machines, stable speed regulation and repeatable acceleration are often important.

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Labeling Equipment

Labeling machines frequently require fast and accurate synchronization between product movement and label feeding.

The MPL-B320P-SK72AA can be used for label-feeding rollers, product-positioning systems, indexing mechanisms, and synchronized conveyor sections.

The high-speed capability makes it suitable for machines where short motion cycles are repeated continuously.

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Electronics Manufacturing

Electronic assembly machinery frequently requires controlled, repeatable motion.

Potential applications include component positioning, indexing tables, inspection stages, transfer mechanisms, and automated handling equipment.

The absolute single-turn encoder provides position feedback for closed-loop servo control.

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Inspection and Test Equipment

Inspection equipment can use servo motors for moving cameras, sensors, fixtures, test heads, or workpieces.

The low-inertia design is useful when the inspection stage repeatedly accelerates, moves into position, stops, performs an inspection, and then returns to another position.

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16. Application Selection Considerations

Application Requirement	Suitability of MPL-B320P-SK72AA
High-speed rotation	Excellent fit
Repeated acceleration/deceleration	Well suited
Precision positioning	Well suited
Horizontal servo axis	Well suited
Packaging equipment	Well suited
Assembly equipment	Well suited
Conveyor synchronization	Well suited
High-cycle indexing	Well suited
Vertical load requiring motor holding	Requires additional brake/holding solution
Multi-turn absolute positioning	Consider a multi-turn version
Keyed coupling required	Consider a keyed-shaft version
Integrated holding brake required	Consider a brake-equipped version
Dimensions	Approx. 307.09 × 202.95 × 239.01 mm
Weight	Approx. 3.65 kg

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17. Five Closely Related Models

The following models are closely related configurations and can be considered when the machine requires a different shaft, brake, or encoder arrangement.

Model	Main Configuration	Speed	Power / Torque	Feedback	Shaft	Brake	Dimensions	Weight
MPL-B320P-SK72AA	460 V, 100 mm, 50.8 mm stack	5000 rpm	1.5 kW / 3.05 Nm	Single-turn absolute	Keyless	No	Approx. 307.09 × 202.95 × 239.01 mm	3.65 kg
MPL-B320P-SK74AA	460 V, 100 mm, 50.8 mm stack	5000 rpm	1.5 kW / 3.05 Nm	Single-turn absolute	Keyless	24 V DC	Approx. B320P family envelope	Approx. 4.5 kg
MPL-B320P-SJ72AA	460 V, 100 mm, 50.8 mm stack	5000 rpm	1.5 kW / 3.05 Nm	Single-turn absolute	Keyed	No	Approx. B320P family envelope	Approx. 4.5 kg
MPL-B320P-SJ74AA	460 V, 100 mm, 50.8 mm stack	5000 rpm	1.5 kW / 3.05 Nm	Single-turn absolute	Keyed	24 V DC	Approx. B320P family envelope	Approx. 4.54 kg
MPL-B320P-MJ72AA	460 V, 100 mm, 50.8 mm stack	5000 rpm	1.5 kW / 3.05 Nm	Multi-turn absolute	Keyed	No	Approx. B320P family envelope	Approx. 4.5 kg

The SK72AA and SK74AA are particularly close because both use the keyless shaft configuration. The major difference is the brake option.

The SJ72AA and SJ74AA are similarly related, but use a keyed shaft. The “MJ” configuration changes the feedback arrangement to a multi-turn absolute encoder, which can be useful for applications where position information over multiple mechanical revolutions is required.

For replacement projects, the motor should not be selected solely from the base B320P designation. The complete suffix should be checked because shaft, brake, feedback, and connector configurations can affect mechanical compatibility.

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18. Related Model Comparison

Feature	MPL-B320P-SK72AA	MPL-B320P-SK74AA	MPL-B320P-SJ72AA	MPL-B320P-SJ74AA	MPL-B320P-MJ72AA
Voltage	460 V class	460 V class	460 V class	460 V class	460 V class
Frame	100 mm	100 mm	100 mm	100 mm	100 mm
Stack	50.8 mm	50.8 mm	50.8 mm	50.8 mm	50.8 mm
Speed	5000 rpm	5000 rpm	5000 rpm	5000 rpm	5000 rpm
Power	1.5 kW	1.5 kW	1.5 kW	1.5 kW	1.5 kW
Continuous Torque	3.05 Nm	3.05 Nm	3.05 Nm	3.05 Nm	3.05 Nm
Feedback	Single-turn	Single-turn	Single-turn	Single-turn	Multi-turn
Shaft	Keyless	Keyless	Keyed	Keyed	Keyed
Brake	No	Yes	No	Yes	No
Dimensions	Approx. 307.09 × 202.95 × 239.01 mm	Family dependent	Family dependent	Family dependent	Family dependent
Weight	Approx. 3.65 kg	Approx. 4.5 kg	Approx. 4.5 kg	Approx. 4.54 kg	Approx. 4.5 kg

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19. Five Representative Same-Brand Models

The following five models are representative Allen-Bradley servo motors that can be considered alongside the MPL-B320P-SK72AA. They cover different frame sizes, stack lengths, feedback configurations, and torque ranges.

Model	Series / Type	Speed	Continuous Power	Continuous Torque	Feedback	Shaft / Brake	Dimensions	Weight
MPL-B310P-SJ74AA	MPL Low Inertia	5000 rpm	Approx. 0.77 kW	Approx. 1.58 Nm	Single-turn absolute	Keyed / Brake	Approx. 100 mm frame; verify drawing	Approx. 2.7 kg
MPL-B320P-MK74AA	MPL Low Inertia	5000 rpm	Approx. 1.5 kW	Approx. 3.05 Nm	Multi-turn absolute	Keyless / Brake	Approx. 100 mm frame	Approx. 4.5 kg
MPL-B330P-MK74AA	MPL Low Inertia	5000 rpm	Approx. 1.8 kW	Approx. 4.18 Nm	Multi-turn absolute	Keyless / Brake	Approx. 100 mm frame, 76.2 mm stack	Approx. 6.1 kg
MPL-B420P-MJ74AA	MPL Low Inertia	5000 rpm	Approx. 1.9 kW	Approx. 4.74 Nm	Multi-turn absolute	Keyed / Brake	Approx. 115 mm frame	Approx. 6.4 kg
MPL-B430P-MJ72AA	MPL Low Inertia	5000 rpm	Approx. 2.2 kW	Approx. 6.55 Nm	Multi-turn absolute	Keyed / No brake	Approx. 130 mm frame	Approx. 9.2 kg

The five models above are representative alternatives rather than a ranking. The appropriate choice depends on machine torque, acceleration requirements, feedback requirements, available installation space, coupling style, and whether the motor must provide mechanical holding.

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20. Same-Series Performance Comparison

Model	Frame	Stack	Speed	Power	Continuous Torque	Peak Torque	Approx. Weight	Dimensions
MPL-B310P	100 mm	Short	5000 rpm	0.77 kW	1.58 Nm	3.61 Nm	Approx. 2.7 kg	Approx. 100 mm frame; verify drawing
MPL-B320P	100 mm	50.8 mm	5000 rpm	1.5 kW	3.05 Nm	7.91 Nm	Approx. 3.65–4.5 kg depending on configuration	Approx. 307.09 × 202.95 × 239.01 mm for SK72AA
MPL-B330P	100 mm	76.2 mm	5000 rpm	1.8 kW	4.18 Nm	11.1 Nm	Approx. 6.1 kg	Approx. 100 mm frame
MPL-B420P	115 mm	50.8 mm	5000 rpm	1.9 kW	4.74 Nm	13.5 Nm	Approx. 6.4 kg	Approx. 115 mm frame
MPL-B430P	130 mm	50.8 mm class	5000 rpm	2.2 kW	6.55 Nm	19.8 Nm	Approx. 9.2 kg	Approx. 130 mm frame

The B320P occupies a useful middle position in this group. It provides considerably more torque than the smaller B310P while remaining smaller and lighter than many of the higher-output B330P, B420P, and B430P configurations.

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21. Why Choose the MPL-B320P-SK72AA?

The MPL-B320P-SK72AA is a particularly practical configuration when a machine requires a 5000 rpm servo motor, approximately 1.5 kW continuous output, 3.05 Nm continuous torque, high-resolution single-turn feedback, and a keyless shaft without an integrated brake.

Its configuration avoids unnecessary brake hardware when the application does not require motor holding.

The keyless shaft can also simplify coupling selection when a suitable clamping-style coupling is already part of the machine design.

Another important advantage is the relatively compact 100 mm frame. This can help machine designers maintain a smaller motor envelope while still achieving relatively high rotational speed and useful continuous torque.

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22. Installation Considerations

Before installing the MPL-B320P-SK72AA, the motor and drive combination should be checked as a complete motion-control system.

The feedback protocol must be compatible with the selected servo drive, and the motor power and feedback cables must be appropriate for the installation.

The mechanical interface should also be checked carefully. Because this model uses a keyless shaft, the coupling must be compatible with the shaft design.

The mounting flange should be aligned correctly, and the coupling should not impose excessive radial or axial load on the motor shaft.

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23. Servo Drive Compatibility

The technical documentation identifies compatibility with several motion-control drive families, including Kinetix 5500, Kinetix 6200/6500, Kinetix 6000, Kinetix 300, Kinetix 350, Kinetix 2000, Kinetix 7000, and Ultra 3000 families.

The exact drive selection should still be confirmed against the motor’s electrical ratings, feedback requirements, firmware or configuration requirements, cable selection, and the specific machine architecture.

A servo motor should not be treated as a standalone component. The motor, drive, feedback system, power cables, feedback cables, and mechanical load form one motion-control system.

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24. Cable and Connector Considerations

The SpeedTEC DIN connector is positioned at a right angle and can be rotated through approximately 180°.

This is useful in machines where the motor is installed close to a frame, guard, gearbox, conveyor, or other mechanical structure.

The cable should be routed so that the connector is not subjected to continuous mechanical stress.

A suitable cable bend radius should be maintained, and cables should be protected from sharp edges, excessive heat, moving machine components, and unnecessary vibration.

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25. Maintenance Considerations

Servo motors generally require less routine mechanical maintenance than many conventional motor systems, but inspection is still important in industrial environments.

The motor mounting bolts, coupling, cable connections, connector condition, mechanical vibration, operating temperature, and abnormal noise should be checked as part of a suitable maintenance program.

If the motor begins showing unusual vibration or temperature rise, the problem should not automatically be attributed to the motor itself. Possible causes include coupling misalignment, excessive radial load, bearing problems, incorrect servo tuning, mechanical resonance, excessive acceleration, or a change in the driven load.

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26. Brake Selection Considerations

The absence of a brake is an important feature of the SK72AA configuration.

For a horizontal axis, this may be completely appropriate.

For a vertical axis, however, the machine designer must consider what happens if servo power is removed. If the load can move under gravity, an external holding mechanism or a brake-equipped servo configuration may be required.

This is one of the main reasons the related MPL-B320P-SK74AA and MPL-B320P-SJ74AA configurations can be considered when a brake is required.

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27. Keyless Shaft Versus Keyed Shaft

Feature	Keyless Configuration	Keyed Configuration
Example	MPL-B320P-SK72AA	MPL-B320P-SJ72AA
Shaft Type	Keyless	Keyed
Coupling	Clamping/keyless coupling	Compatible keyed coupling
Mechanical Installation	Requires correct clamping arrangement	Traditional keyed connection
High-Speed Application	Suitable with correct coupling	Suitable with correct coupling
Replacement Compatibility	Must match existing shaft system	Must match existing shaft system
Dimensions	Approx. 307.09 × 202.95 × 239.01 mm for SK72AA	Verify exact drawing
Weight	Approx. 3.65 kg	Approx. 4.5 kg

The keyless and keyed versions should not be considered automatically interchangeable. Even when the electrical ratings are similar, the mechanical shaft interface can prevent direct replacement.

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28. Single-Turn Versus Multi-Turn Feedback

The MPL-B320P-SK72AA uses a single-turn absolute encoder.

For applications where the machine only needs absolute position information within one revolution, this configuration can be very practical.

For applications requiring absolute position tracking across multiple revolutions, a multi-turn configuration such as an MJ or MK version may be more appropriate.

The feedback choice should therefore be made according to the actual motion profile and machine control architecture rather than simply selecting the motor with the highest specification.

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29. Product Advantages in Practical Machine Design

The first major advantage is speed. With a 5000 rpm rating, the motor can support fast rotary motion and short machine cycles.

The second advantage is dynamic response. The low-inertia rotor is useful in applications with repeated acceleration and deceleration.

The third advantage is feedback resolution. The 1024-cycle Sin/Cos feedback system provides the servo drive with detailed position information.

The fourth advantage is the keyless shaft. When paired with an appropriate coupling, this can provide a clean mechanical connection for precision motion systems.

The fifth advantage is the no-brake configuration. For applications that do not need motor holding, the absence of a brake provides a straightforward motor configuration.

The sixth advantage is the rotatable right-angle connector, which can make cable routing easier in compact machine layouts.

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30. Detailed Product Summary

Category	MPL-B320P-SK72AA
Model	MPL-B320P-SK72AA
Brand	Allen-Bradley
Series	MPL Low-Inertia Servo Motor
Motor Type	Brushless AC Rotary Servo Motor
Voltage	460 V nominal configuration
Voltage Class	400 V AC
Rated Speed	5000 rpm
Maximum Speed	5000 rpm
Continuous Power	1.5 kW
Continuous Torque	3.05 Nm
Peak Torque	7.91 Nm
Rotor Inertia	7.8 × 10⁻⁵ kg·m²
Frame Size	100 mm
Magnet Stack	50.8 mm
Feedback	Absolute single-turn
Resolution	1024 Sin/Cos cycles/rev
Protocol	Hiperface
Shaft	Keyless
Shaft Seal	No
Brake	No brake
Connector	SpeedTEC DIN
Connector Position	Right angle
Connector Rotation	180°
Mounting	IEC metric flange
Maximum Operating Temperature	40 °C
Approx. Dimensions	307.09 × 202.95 × 239.01 mm
Approx. Weight	3.65 kg

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31. Engineering Selection Checklist

Before selecting the MPL-B320P-SK72AA for a machine, the following points should be checked:

Check Item	Requirement
Model	MPL-B320P-SK72AA
Motor Power	Confirm 1.5 kW is sufficient
Continuous Torque	Confirm 3.05 Nm is sufficient
Peak Torque	Confirm 7.91 Nm covers acceleration requirements
Speed	Confirm 5000 rpm meets machine requirements
Rotor Inertia	Compare with reflected load inertia
Feedback	Confirm single-turn absolute feedback is appropriate
Feedback Protocol	Confirm Hiperface compatibility
Shaft	Confirm keyless shaft compatibility
Brake	Confirm no brake is acceptable
Connector	Confirm right-angle connector clearance
Mounting	Confirm 100 mm metric flange
Dimensions	Allow approximately 307.09 × 202.95 × 239.01 mm
Weight	Allow approximately 3.65 kg
Environment	Confirm temperature and environmental requirements
Cable	Confirm suitable motor and feedback cables
Drive	Confirm drive compatibility
Coupling	Confirm coupling type and shaft loading
Mechanical Load	Check radial and axial forces
Servo Tuning	Check acceleration, deceleration, gain, and resonance

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32. Overall Advantages

The Allen-Bradley MPL-B320P-SK72AA is a well-defined low-inertia servo configuration for machines requiring fast, repeatable, closed-loop rotary motion.

Its combination of 1.5 kW continuous power, 3.05 Nm continuous torque, 7.91 Nm peak torque, 5000 rpm speed, single-turn high-resolution absolute feedback, keyless shaft construction, 100 mm frame size, and no-brake configuration gives machine builders several useful options for dynamic automation applications.

The model is especially attractive for applications where rapid acceleration and deceleration are more important than extremely high continuous torque.

The keyless shaft makes it a good candidate for compatible clamping couplings, while the lack of an integrated brake makes the configuration suitable for axes that do not need motor-based holding.

The 180° rotatable right-angle SpeedTEC DIN connector is another practical feature, particularly for machines with restricted cable-routing space.

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33. Final Product Description

The Allen-Bradley MPL-B320P-SK72AA is a MPL Low-Inertia 460 V-class rotary servo motor with a 100 mm frame, 50.8 mm magnet stack, 5000 rpm rated speed, 1.5 kW continuous output, 3.05 Nm continuous torque, and 7.91 Nm peak torque.

It uses an absolute single-turn high-resolution encoder with 1024 Sin/Cos cycles per revolution and Hiperface feedback, providing the feedback required for accurate closed-loop motion control.

The motor has a keyless shaft, no integrated brake, and a right-angle SpeedTEC DIN connector with 180° rotational flexibility. These features make the motor particularly suitable for compact, high-speed automated machinery where a holding brake is not required.

Typical applications include packaging machinery, automated assembly equipment, material handling systems, printing machinery, converting equipment, labeling machines, electronics manufacturing equipment, inspection systems, indexing equipment, and other automated production machinery.

From a practical engineering perspective, the most important characteristics to verify before purchase or replacement are the 1.5 kW power rating, 3.05 Nm continuous torque, 7.91 Nm peak torque, 5000 rpm speed, single-turn feedback, keyless shaft, no-brake configuration, connector orientation, mounting dimensions, and approximately 3.65 kg motor weight.

For applications requiring a keyed shaft, an integrated brake, or multi-turn absolute feedback, the closely related MPL-B320P configurations should be considered instead of treating the entire B320P family as mechanically interchangeable.