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MPL-B330P-RK72AA Low-Inertia Servo Motor

1. Product Overview

The MPL-B330P-RK72AA is a low-inertia brushless AC rotary servo motor designed for industrial automation and precision motion-control applications.

It belongs to the MP-Series MPL low-inertia servo motor family and is intended for machines that require rapid acceleration and deceleration, accurate positioning, stable speed control, and repeatable servo operation.

The motor has a 100 mm frame size and a 76.2 mm magnet stack length. It is rated for 5000 rpm operation and provides approximately 4.18 Nm of continuous torque, 11.1 Nm of peak torque, and 1.8 kW of continuous output power.

The MPL-B330P-RK72AA uses resolver feedback rather than the absolute encoder used on some other MPL-B330P configurations. The resolver configuration is useful in industrial environments where a rugged and straightforward feedback system is required.

This particular model uses a keyless shaft extension and does not include an integral holding brake. The shaft configuration and absence of a brake distinguish it from several other MPL-B330P suffix configurations.

The motor is equipped with a right-angle SpeedTEC DIN connector that can be rotated through approximately 180 degrees, giving the machine designer additional flexibility when routing motor cables.

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2. Brand and Product Classification

Item	Specification
Brand	Allen-Bradley
Product Family	MP-Series
Product Series	MPL Low-Inertia Servo Motors
Product Type	Brushless AC Rotary Servo Motor
Model	MPL-B330P-RK72AA
Motor Technology	Permanent-Magnet Brushless AC Servo
Voltage Class	400 V AC
Rated Voltage	460 V AC
Frame Size	100 mm
Magnet Stack Length	76.2 mm
Rated Speed	5000 rpm
Maximum Listed Speed	5000 rpm
Feedback	Resolver
Shaft	Keyless Shaft Extension
Brake	No Integral Brake
Connector	SpeedTEC DIN
Connector Style	Right Angle
Connector Rotation	180° Rotatable
Mounting	IEC Metric Flange
Mounting Hole Configuration	Free Mounting Holes, Type FF
Approximate Motor Weight	5.44 kg

The 100 mm frame and 76.2 mm stack are key mechanical identification characteristics of this model. The exact overall envelope should be taken from the applicable mechanical drawing rather than calculated simply from these two dimensions.

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3. Product Series

The MPL-B330P-RK72AA belongs to the MP-Series MPL Low-Inertia Servo Motor family.

The MPL family is designed around low rotor inertia and high-speed servo operation. The motor range covers different frame sizes, torque ratings, speed ratings, feedback arrangements, shaft configurations, and brake options.

The low-inertia design is particularly useful for machines that repeatedly accelerate, decelerate, stop, reverse direction, or move between programmed positions.

Within this family, the B330P motor occupies a medium-capacity position, providing 4.18 Nm continuous torque and 1.8 kW continuous output at a rated speed of 5000 rpm.

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4. Model Configuration

The MPL-B330P-RK72AA configuration can be summarized as follows.

Configuration	Description
MPL	MP-Series Low-Inertia Servo Motor
B330P	100 mm frame / 76.2 mm stack / 5000 rpm motor class
R	Resolver feedback
K	Keyless shaft extension
7	SpeedTEC DIN right-angle connector
2	No integral brake
AA	Standard configuration

The combination of resolver feedback, keyless shaft, and no-brake configuration makes this model different from other B330P variants that use encoder feedback, keyed shafts, or integrated brakes.

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5. Detailed Technical Specifications

Parameter	Specification
Model	MPL-B330P-RK72AA
Product Series	MPL Low-Inertia Servo
Motor Type	Brushless AC Rotary Servo Motor
Voltage Class	400 V AC
Rated Armature Voltage	460 V AC
Rated Speed	5000 rpm
Maximum Listed Speed	5000 rpm
Continuous Torque	4.18 Nm
Peak Torque	11.1 Nm
Continuous Output Power	1.8 kW
Continuous Stall Current	Approx. 6.1 A
Peak Stall Current	Approx. 19.0 A
Rotor Inertia	0.00012 kg·m²
Frame Size	100 mm
Magnet Stack Length	76.2 mm
Feedback Type	Resolver
Shaft Configuration	Keyless
Brake	None
Shaft Seal	None
Connector	SpeedTEC DIN
Connector Style	Right Angle
Connector Rotation	180°
Mounting Standard	IEC Metric
Mounting Holes	Type FF, Free Mounting Holes
Maximum Operating Temperature	Approximately 40 °C
Approximate Motor Weight	5.44 kg

The published motor performance data identifies the B330P family at 5000 rpm, 4.18 Nm continuous torque, 11.1 Nm peak torque, 1.8 kW continuous power, and 0.00012 kg·m² rotor inertia.

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6. Dimensions and Weight

The most important dimensional characteristics of the MPL-B330P-RK72AA are its 100 mm frame and 76.2 mm magnet stack.

Mechanical Parameter	Specification
Frame Size	100 mm
Frame Size in Inches	3.94 in
Magnet Stack Length	76.2 mm
Magnet Stack Length in Inches	3.0 in
Mounting Standard	IEC Metric
Mounting Configuration	Flange Mount
Mounting Holes	Type FF
Shaft Configuration	Keyless
Shaft Seal	None
Connector	Right-Angle SpeedTEC DIN
Connector Rotation	180°
Motor Weight	Approx. 5.44 kg
Overall Length	Configuration-dependent
Complete Installed Envelope	Mechanical-drawing dependent

The frame size and stack length should not be treated as the complete outside dimensions of the finished motor. The shaft extension, rear feedback assembly, connector, flange, and other mechanical features also affect the installed envelope.

For replacement applications, the mounting pattern and complete mechanical envelope should be checked before installation.

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7. Electrical Performance

The motor operates in the 400 V AC class and has a rated armature voltage of approximately 460 V AC.

Electrical Parameter	Specification
Voltage Class	400 V AC
Armature Voltage	460 V AC
Continuous Stall Current	Approx. 6.1 A
Peak Stall Current	Approx. 19.0 A
Continuous Power	1.8 kW
Rated Speed	5000 rpm
Continuous Torque	4.18 Nm
Peak Torque	11.1 Nm

The continuous and peak current values are important when matching the motor with the appropriate servo drive.

The drive should be selected according to motor voltage, current requirements, feedback configuration, cable requirements, duty cycle, and the complete motion-control system.

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8. Torque Performance

The MPL-B330P-RK72AA provides approximately 4.18 Nm of continuous torque and 11.1 Nm of peak torque.

Torque Parameter	Value
Continuous Torque	4.18 Nm
Peak Torque	11.1 Nm
Continuous Power	1.8 kW
Rated Speed	5000 rpm

The continuous torque rating is relevant to sustained machine operation.

The peak torque rating provides additional short-duration torque capacity for acceleration, deceleration, positioning, and transient load conditions.

For proper motor selection, the machine load should be evaluated using both continuous torque and peak torque requirements rather than using only the nominal motor power rating.

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9. Low-Inertia Characteristics

The rotor inertia of the B330P motor is approximately 0.00012 kg·m².

Parameter	Value
Rotor Inertia	0.00012 kg·m²
Continuous Torque	4.18 Nm
Peak Torque	11.1 Nm
Rated Speed	5000 rpm

Low rotor inertia is useful when the machine requires rapid changes in motor speed.

Typical benefits include:

• Faster acceleration.
• Faster deceleration.
• Shorter positioning cycles.
• Improved response to motion commands.
• Reduced internal rotational inertia.
• Good suitability for repetitive indexing applications.

The actual dynamic response of a complete servo system also depends on the reflected load inertia, transmission ratio, coupling stiffness, mechanical resonance, and servo tuning.

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10. Resolver Feedback

The MPL-B330P-RK72AA uses resolver feedback.

Feedback Parameter	Specification
Feedback Type	Resolver
Feedback Function	Position and speed feedback
Control Configuration	Closed-loop servo
Feedback Technology	Electromagnetic resolver
Typical Benefit	Rugged industrial operation

Resolver feedback is well suited to applications where mechanical durability and stable feedback operation are important.

A resolver does not use the same signal format as an absolute multi-turn encoder, so the motor and drive must be selected as a compatible combination.

This is particularly important when replacing an existing motor. A B330P model with a different feedback type should not be assumed to be a direct electrical replacement merely because the frame and torque ratings are similar.

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11. Keyless Shaft Configuration

The motor uses a keyless shaft extension.

Shaft Parameter	Specification
Shaft Type	Keyless
Shaft Key	None
Shaft Seal	None
Mechanical Connection	Clamping or compatible coupling arrangement
Typical Applications	Precision couplings, gearboxes, belt-drive systems

The keyless shaft can be useful where the machine uses a precision clamping coupling or another suitable shaft connection.

The coupling must be selected according to the motor torque, speed, radial load, axial load, alignment requirements, and acceleration characteristics.

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12. Brake Configuration

The MPL-B330P-RK72AA does not include an integral holding brake.

Brake Parameter	Specification
Integral Brake	No
Brake Voltage	Not Applicable
Holding Brake	Not Included
External Brake	Application Dependent
Vertical Axis Use	Requires Separate Load-Holding Evaluation

This configuration is suitable for applications where a motor holding brake is not required.

For vertical axes, lifting mechanisms, or gravity-loaded equipment, an external holding device may be required.

The absence of a motor brake should therefore be considered during machine safety and mechanical design.

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13. SpeedTEC DIN Connector

The motor uses a right-angle SpeedTEC DIN connector.

Connector Parameter	Specification
Connector Type	SpeedTEC DIN
Connector Configuration	Right Angle
Rotation	Approximately 180°
Connection Type	Quick Connect
Installation Benefit	Flexible cable routing

The rotatable connector allows the cable exit direction to be adjusted according to the available machine space.

This can be useful when the motor is installed close to machine guards, linear rails, gearboxes, covers, or other components.

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14. Mounting

The motor uses an IEC metric flange mounting arrangement.

Mounting Parameter	Specification
Mounting Type	Flange Mount
Standard	IEC Metric
Frame	100 mm
Mounting Holes	Free Mounting Holes, Type FF
Shaft	Keyless
Installation Orientation	Application Dependent

The motor should be mounted on a sufficiently rigid machine structure.

Correct shaft alignment is important because excessive radial or axial loads can reduce bearing life and negatively affect servo performance.

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15. Product Applications

Packaging Machinery

The motor is suitable for packaging machinery requiring rapid and repeatable motion.

Typical applications include:

• Indexing mechanisms.
• Product positioning.
• Feeding mechanisms.
• Cutting systems.
• Sealing equipment.
• Labeling machines.
• Rotary stations.

The 5000 rpm speed capability and low rotor inertia are useful for high-cycle applications.

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Material Handling

The motor can be used in automated material handling systems.

Typical applications include:

• Conveyor positioning.
• Transfer units.
• Rotary indexing systems.
• Automated feeding equipment.
• Pick-and-place mechanisms.
• Material positioning systems.

The resolver feedback provides closed-loop motor position and speed information for controlled motion.

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Assembly Equipment

The motor is suitable for automated assembly machinery.

Applications include:

• Component positioning.
• Insertion mechanisms.
• Automated inspection systems.
• Electronic assembly equipment.
• Precision indexing stations.

The low-inertia design is useful where the machine performs frequent start-stop movements.

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Printing and Converting Machinery

The motor can be used in printing and converting systems involving controlled rotary motion.

Potential applications include:

• Feed rollers.
• Web handling.
• Cutting mechanisms.
• Material positioning.
• Roller synchronization.

The high-speed motor rating is suitable for machine sections that require fast rotational movement.

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Machine Tools

Potential applications include:

• Rotary indexing.
• Feed mechanisms.
• Auxiliary positioning.
• Tool handling.
• Automated machine modules.

The motor should be matched to the machine’s actual torque, speed, inertia, and duty-cycle requirements.

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General Factory Automation

The motor can also be used in:

• Automated production machines.
• Special-purpose machinery.
• Servo-driven positioning modules.
• Rotary indexing units.
• Automated inspection equipment.
• Production-line motion systems.

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16. Product Advantages

High-Speed Operation

The 5000 rpm rating provides a high rotational speed suitable for fast-cycle automation equipment.

This can help reduce motion time and support compact mechanical transmission designs.

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Low Rotor Inertia

The approximately 0.00012 kg·m² rotor inertia provides a relatively low rotational inertia for the motor’s torque class.

This makes the motor particularly useful for applications with frequent acceleration and deceleration.

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High Peak Torque

The motor can provide approximately 11.1 Nm peak torque.

This additional torque capacity can be useful during short acceleration and deceleration periods.

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Rugged Resolver Feedback

The resolver feedback configuration is well suited to industrial environments where mechanical durability and stable feedback operation are important.

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Compact 100 mm Frame

The 100 mm frame provides a useful balance between motor output and physical machine size.

The motor can be incorporated into medium-size automation equipment without moving to a substantially larger motor frame.

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Keyless Shaft

The keyless shaft provides a smooth shaft interface for compatible clamping couplings and mechanical transmission components.

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Flexible Connector Orientation

The 180° rotatable right-angle connector provides additional flexibility when routing motor cables.

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No Integrated Brake

For applications that do not require a holding brake, the no-brake configuration avoids the additional brake mechanism and its associated electrical connection.

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17. Servo Drive Compatibility

The MPL-B330P family is associated with several servo drive families.

Drive Family	Typical Application
Kinetix 5500	Modern integrated servo systems
Kinetix 6200 / 6500	Multi-axis motion systems
Kinetix 6000	Coordinated multi-axis motion
Kinetix 300	Compact servo applications
Kinetix 350	Compact networked motion applications
Kinetix 2000	Multi-axis servo systems
Kinetix 7000	Higher-power motion applications
Ultra 3000	Earlier servo motion systems

The exact drive compatibility must be checked against the motor feedback type, motor voltage, current requirements, cable configuration, and drive firmware.

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18. Recommended Same-Series or Related Models

The following models are useful comparison choices within the same MPL family.

Model	Rated Speed	Continuous Torque	Peak Torque	Power	Rotor Inertia	Approx. Weight	Dimension Reference
MPL-B310P	5000 rpm	1.58 Nm	3.61 Nm	0.77 kW	0.000044 kg·m²	2.7 kg	Approx. 63 mm class
MPL-B320P	5000 rpm	3.05 Nm	7.91 Nm	1.5 kW	0.000078 kg·m²	3.7 kg	Approx. 80 mm class
MPL-B330P	5000 rpm	4.18 Nm	11.1 Nm	1.8 kW	0.00012 kg·m²	4.6 kg	100 mm class
MPL-B420P	5000 rpm	4.74 Nm	13.5 Nm	1.9 kW	0.00026 kg·m²	4.3 kg	100 mm class
MPL-B430P	5000 rpm	6.55 Nm	19.8 Nm	2.2 kW	0.00038 kg·m²	5.5 kg	Approx. 115 mm class

The published family specifications list the B310P through B430P models with the performance values shown above.

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19. Five Related Model Configurations

If the application requires a motor with similar mechanical or performance characteristics, the following configurations are useful for comparison.

Model	Feedback	Shaft	Brake	Speed	Continuous Torque	Power	Size
MPL-B330P-RJ72AA	Resolver	Keyed	No	5000 rpm	4.18 Nm	1.8 kW	100 mm / 76.2 mm
MPL-B330P-RJ74AA	Resolver	Keyed	24V DC	5000 rpm	4.18 Nm	1.8 kW	100 mm / 76.2 mm
MPL-B330P-RK74AA	Resolver	Keyless	24V DC	5000 rpm	4.18 Nm	1.8 kW	100 mm / 76.2 mm
MPL-B330P-MK72AA	Absolute Multi-Turn Encoder	Keyless	No	5000 rpm	4.18 Nm	1.8 kW	100 mm / 76.2 mm
MPL-B330P-MJ74AA	Absolute Multi-Turn Encoder	Keyed	24V DC	5000 rpm	4.18 Nm	1.8 kW	100 mm / 76.2 mm

These configurations illustrate why the complete catalog number is important when selecting a replacement. The basic B330P performance can remain similar while feedback, shaft, and brake configurations change. The existence of these B330P variants is documented in product listings and cross-reference catalogs.

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20. Five Representative Same-Brand Models

Rather than treating “popular” as a formal market ranking, the following are representative models from the same product family that are commonly useful for technical comparison.

Model	Series	Rated Speed	Continuous Torque	Peak Torque	Power	Rotor Inertia	Weight	Dimension Reference
MPL-B310P	MPL Low-Inertia	5000 rpm	1.58 Nm	3.61 Nm	0.77 kW	0.000044 kg·m²	2.7 kg	63 mm class
MPL-B320P	MPL Low-Inertia	5000 rpm	3.05 Nm	7.91 Nm	1.5 kW	0.000078 kg·m²	3.7 kg	80 mm class
MPL-B330P	MPL Low-Inertia	5000 rpm	4.18 Nm	11.1 Nm	1.8 kW	0.00012 kg·m²	4.6 kg	100 mm class
MPL-B420P	MPL Low-Inertia	5000 rpm	4.74 Nm	13.5 Nm	1.9 kW	0.00026 kg·m²	4.3 kg	100 mm class
MPL-B430P	MPL Low-Inertia	5000 rpm	6.55 Nm	19.8 Nm	2.2 kW	0.00038 kg·m²	5.5 kg	115 mm class

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21. Comparison with the MPL-B330P-RJ74AA

The MPL-B330P-RK72AA and MPL-B330P-RJ74AA are closely related configurations, but they should not be treated as identical motors.

Feature	MPL-B330P-RK72AA	MPL-B330P-RJ74AA
Motor Family	MPL-B330P	MPL-B330P
Rated Speed	5000 rpm	5000 rpm
Continuous Torque	4.18 Nm	4.18 Nm
Peak Torque	11.1 Nm	11.1 Nm
Continuous Power	1.8 kW	1.8 kW
Feedback	Resolver	Resolver
Shaft	Keyless	Keyed
Brake	No Brake	24V DC Brake
Frame	100 mm	100 mm
Stack	76.2 mm	76.2 mm
Connector	SpeedTEC DIN Right Angle	SpeedTEC DIN Right Angle
Typical Use	Horizontal/general motion	Applications requiring holding brake

The major practical differences are the shaft configuration and brake configuration.

This distinction is important when replacing a motor in an existing machine. A keyless shaft cannot automatically be substituted for a keyed shaft without checking the coupling arrangement.

Likewise, a no-brake model should not be used as a direct replacement for a brake-equipped motor where the brake performs an important load-holding function.

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22. Application Selection Guidelines

When selecting the MPL-B330P-RK72AA, several factors should be evaluated.

Continuous Load

The machine’s continuous operating torque should remain within the appropriate motor operating range.

A continuous torque requirement around 4.18 Nm or below may be suitable depending on the complete duty cycle and thermal conditions.

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Peak Load

The acceleration and deceleration requirements should be checked against the motor’s peak torque capability of approximately 11.1 Nm.

Short-duration acceleration loads can be considerably higher than the steady running torque.

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Speed

The application should be evaluated at its actual operating speed.

The motor is rated for 5000 rpm, making it suitable for high-speed servo applications.

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Inertia

The load inertia should be reflected back to the motor shaft through the actual transmission system.

This is especially important when the machine uses:

• Gearboxes.
• Timing belts.
• Ball screws.
• Pulleys.
• Rotary tables.
• Couplings.

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Feedback

Because this model uses a resolver, the servo drive must support the appropriate resolver feedback arrangement.

A motor with a different feedback technology may have similar mechanical specifications but still require a different drive configuration.

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23. Maintenance Considerations

The motor should be periodically inspected as part of the machine’s normal maintenance program.

Important inspection points include:

• Motor mounting bolts.
• Shaft and coupling condition.
• Cable and connector condition.
• Excessive vibration.
• Abnormal motor noise.
• Mechanical alignment.
• Servo following error.
• Feedback-related faults.
• Motor temperature.
• Bearing condition.

Because this particular model does not include a holding brake, any external mechanical brake or load-holding mechanism should also be inspected separately when used.

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24. Typical Troubleshooting Reference

Symptom	Areas to Check
Motor does not start	Servo enable, power circuit, drive configuration
Feedback fault	Resolver wiring, connector, feedback configuration
Excessive vibration	Coupling alignment, mechanical resonance, servo tuning
Position error	Resolver feedback, load inertia, tuning, mechanical slip
Motor overheating	Load torque, duty cycle, ambient temperature, ventilation
Poor acceleration	Motor sizing, peak torque requirement, inertia ratio
Excessive noise	Bearings, coupling alignment, mechanical resonance
Unexpected movement after power-off	External holding mechanism, machine safety design
Intermittent servo fault	Connector, cable, feedback circuit, drive settings

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25. Key Product Advantages at a Glance

Advantage	Description
High Speed	5000 rpm rated operation
Continuous Torque	4.18 Nm
Peak Torque	11.1 Nm
Power	1.8 kW
Low Rotor Inertia	0.00012 kg·m²
Resolver Feedback	Rugged closed-loop feedback
Compact Frame	100 mm
Stack Length	76.2 mm
Shaft	Keyless
Brake	None
Connector	Right-angle SpeedTEC DIN
Connector Adjustment	180°
Mounting	IEC Metric
Weight	Approx. 5.44 kg

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26. Final Product Description

The MPL-B330P-RK72AA is a 5000 rpm low-inertia brushless AC servo motor designed for medium-power industrial motion applications.

Its 4.18 Nm continuous torque, 11.1 Nm peak torque, and 1.8 kW continuous power rating provide a useful combination of speed and torque for automated machinery.

The 0.00012 kg·m² rotor inertia supports rapid acceleration and deceleration, making the motor particularly suitable for repetitive positioning and indexing operations.

The resolver feedback configuration provides a robust feedback solution for industrial servo control. It is particularly useful where stable feedback operation and mechanical durability are important.

The 100 mm frame and 76.2 mm magnet stack provide a compact mechanical configuration while maintaining a relatively high output level.

The keyless shaft allows the use of suitable clamping couplings and other precision mechanical connection systems.

The absence of an integral brake makes this model appropriate for applications that do not require motor-mounted holding torque. Vertical or gravity-loaded applications should be evaluated separately for external load-holding requirements.

The right-angle SpeedTEC DIN connector, with approximately 180° rotational flexibility, provides additional freedom when designing the motor installation and cable routing.

Overall, the MPL-B330P-RK72AA combines high-speed operation, low rotor inertia, resolver feedback, compact dimensions, and a keyless mechanical interface in a 100 mm industrial servo motor package.

Its primary technical characteristics can be summarized as 5000 rpm rated speed, 4.18 Nm continuous torque, 11.1 Nm peak torque, 1.8 kW continuous power, 0.00012 kg·m² rotor inertia, 100 mm frame size, 76.2 mm magnet stack, resolver feedback, keyless shaft, no integral brake, and approximately 5.44 kg motor weight.

For replacement applications, the complete MPL-B330P-RK72AA catalog number should be matched carefully. In particular, feedback type, shaft configuration, brake configuration, connector arrangement, frame size, stack length, and motor/drive compatibility should all be checked before substitution.