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MPL-B330P-SK74AA Low-Inertia Servo Motor – Complete Technical Specifications and Product Description

1. Product Overview

The MPL-B330P-SK74AA is a high-performance low-inertia brushless rotary servo motor designed for industrial motion-control systems that require accurate positioning, controlled acceleration and deceleration, high operating speed, and reliable closed-loop feedback.

The motor belongs to the MPL low-inertia servo motor series and uses a permanent-magnet brushless motor construction. It is designed for high-performance servo applications where rapid changes in speed and position are required.

The MPL-B330P-SK74AA uses a 100 mm frame, a 76.2 mm magnet stack, and a rated speed of 5000 RPM. It is equipped with a single-turn high-resolution encoder, a keyless shaft extension, a right-angle SpeedTEC DIN connector, and an integrated 24 V DC holding brake.

The combination of low rotor inertia, high-speed operation, high-resolution feedback, and an integrated holding brake makes this motor suitable for a wide range of automated machinery.

It can be used in applications where the servo axis must accelerate quickly, decelerate accurately, maintain controlled speed, and stop in a defined position.

The integrated brake is an important difference between the SK74AA and the otherwise similar SK72AA configuration. The SK74AA includes a 24 V DC brake, while the SK72AA is the corresponding no-brake configuration.

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2. Brand and Product Classification

Parameter	Specification
Model	MPL-B330P-SK74AA
Brand	Allen-Bradley
Product Family	MP-Series
Product Series	MPL Low-Inertia Servo Motors
Product Type	Rotary Servo Motor
Motor Construction	Brushless Permanent-Magnet Servo Motor
Voltage Class	400 V AC class
Rated Armature Voltage	460 V
Frame Size	100 mm
Frame Designation	Frame 3
Magnet Stack Length	76.2 mm
Magnet Stack	3.0 in.
Rated Speed	5000 RPM
Feedback	Single-turn high-resolution encoder
Shaft	Keyless shaft extension
Shaft Seal	No shaft seal
Brake	24 V DC holding brake
Connector	SpeedTEC DIN
Connector Style	Right-angle
Connector Rotation	180° rotatable
Mounting	IEC metric flange
Mounting Hole Type	Free mounting holes, Type FF
Motor Weight	Approximately 6.7 kg, depending on published configuration data
Frame Dimension	100 mm
Magnet Stack Dimension	76.2 mm

The exact product designation identifies the motor as an MPL low-inertia brushless servo motor with a 460 V rating, 100 mm frame, 76.2 mm stack, 5000 RPM rating, single-turn high-resolution feedback, keyless shaft, rotatable SpeedTEC connector, and 24 V DC brake.

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3. Product Series

MPL Low-Inertia Servo Motor Series

The MPL series is a family of compact brushless permanent-magnet servo motors intended for high-performance industrial motion applications.

The series emphasizes a combination of compact motor dimensions, relatively high torque output, low rotor inertia, high operating speed, and closed-loop feedback.

The low-inertia design is particularly useful in applications where the motor must repeatedly change speed.

For example, an indexing machine may accelerate the motor rapidly, reach a target position, decelerate, stop, reverse direction, and repeat the same operation thousands of times.

A low-inertia rotor reduces the rotational energy that the servo system has to accelerate and decelerate.

This allows the motor and drive combination to respond quickly to changes in command.

The MPL-B330P-SK74AA is positioned in the B330P motor size within this product family.

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4. Model Number Explanation

The complete model number contains information describing the motor’s electrical and mechanical configuration.

Model Code	Description
MPL	MPL low-inertia brushless servo motor family
B	400 V AC voltage-class configuration
3	100 mm frame size
30	76.2 mm / 3.0 in. magnet stack
P	5000 RPM rated-speed configuration
S	Single-turn high-resolution encoder
K	Keyless shaft extension
7	SpeedTEC DIN connector, right-angle, 180° rotatable
4	24 V DC brake
AA	Standard factory configuration

The manufacturer’s configuration data identifies the individual selections represented by the B, frame, stack, speed, feedback, shaft, connector, and brake portions of the model number.

This makes the complete model number important when ordering a replacement motor.

Two MPL motors can have the same frame and stack size while having different feedback, shaft, or brake configurations.

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5. Main Technical Specifications

Parameter	MPL-B330P-SK74AA
Model	MPL-B330P-SK74AA
Brand	Allen-Bradley
Series	MPL Low-Inertia Servo Motor
Motor Type	Brushless AC permanent-magnet servo motor
Voltage Class	400 V AC
Rated Armature Voltage	460 V
Rated Speed	5000 RPM
Maximum Speed	5000 RPM
Continuous Torque	4.18 Nm
Peak Torque	11.1 Nm
Continuous Power	1.8 kW
Rotor Inertia	Approximately 0.00013 kg·m²
Frame Size	100 mm
Magnet Stack	76.2 mm
Magnet Stack	3.0 in.
Feedback	Absolute single-turn high-resolution encoder
Feedback Resolution	1024 Sin/Cos cycles/rev
Feedback Protocol	Hiperface
Shaft Type	Keyless shaft
Shaft Seal	No shaft seal
Brake	24 V DC holding brake
Connector	SpeedTEC DIN
Connector Position	Right-angle
Connector Rotation	180° rotatable
Mounting Flange	IEC metric
Mounting Holes	Free mounting holes, Type FF
Operating Temperature	Up to approximately 40 °C
Motor Weight	Approximately 6.7 kg
Physical Frame Dimension	100 mm
Magnet Stack Dimension	76.2 mm
Complete Motor Envelope	Configuration-dependent

Published technical data for the exact SK74AA configuration lists 5000 RPM rated speed, 4.18 Nm continuous torque, 11.1 Nm peak torque, 1.8 kW continuous power, single-turn absolute feedback, keyless shaft, 24 V DC brake, and a 100 mm frame with 76.2 mm magnet stack.

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6. Dimensions

The MPL-B330P-SK74AA has a 100 mm frame size and a 76.2 mm magnet stack length.

The 100 mm specification represents the IEC frame-size class and should not be interpreted as the total motor length.

Likewise, the 76.2 mm dimension represents the magnet stack rather than the complete mechanical envelope of the assembled motor.

Mechanical Parameter	Specification
Model	MPL-B330P-SK74AA
Frame Size	100 mm
Frame Designation	Frame 3
Magnet Stack Length	76.2 mm
Magnet Stack	3.0 in.
Mounting Standard	IEC metric
Shaft Type	Keyless
Shaft Seal	No shaft seal
Brake	24 V DC
Connector	Right-angle SpeedTEC DIN
Connector Rotation	180°
Mounting Hole Style	Free mounting holes, Type FF
Motor Weight	Approximately 6.7 kg
Complete Housing Length	Configuration-dependent
Complete Housing Width	Configuration-dependent
Complete Housing Height	Configuration-dependent
Installation Envelope	Must be checked against mechanical drawing

The official product configuration identifies the frame as 100 mm and the magnet stack as 76.2 mm. A full dimensional drawing should be used when determining exact mounting clearances, shaft extension dimensions, connector clearance, and overall machine envelope.

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7. Weight

Weight is an important consideration when designing a servo axis, especially when the motor is mounted on a moving machine component.

Published configuration data for the MPL-B330P-SK74AA lists the motor at approximately 6.72 kg.

Because catalog listings can use different packaging and configuration references, the practical shipping weight may be higher than the bare motor weight.

Weight Parameter	Approximate Value
Model	MPL-B330P-SK74AA
Motor Weight	Approximately 6.7 kg
Published Configuration Weight	Approximately 6.72 kg
Shipping Weight	Approximately 8 kg
Weight Including Packaging	Configuration-dependent

The integrated 24 V DC brake contributes to the mechanical weight compared with the corresponding no-brake configuration.

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8. Motor Performance

The B330P motor configuration provides approximately 4.18 Nm of continuous torque and 11.1 Nm of peak torque.

The continuous rated output is approximately 1.8 kW.

The rated speed is 5000 RPM, which makes the motor suitable for high-speed rotary motion applications.

Performance Parameter	Value
Model	MPL-B330P-SK74AA
Rated Speed	5000 RPM
Maximum Speed	5000 RPM
Continuous Torque	4.18 Nm
Peak Torque	11.1 Nm
Continuous Power	1.8 kW
Rotor Inertia	Approximately 0.00013 kg·m²
Frame	100 mm
Stack	76.2 mm
Brake	24 V DC

The B330P family data gives 4.18 Nm continuous torque, 11.1 Nm peak torque, 1.8 kW continuous output, and approximately 0.00012–0.00013 kg·m² rotor inertia depending on the published specification reference.

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9. Low-Inertia Design

Low rotor inertia is one of the main characteristics of the MPL product family.

When the rotor has relatively low inertia, the servo drive does not have to accelerate as much rotational mass during every speed change.

This is particularly useful in machinery with short motion cycles.

For example, consider an indexing mechanism that moves 90 degrees, stops, returns to its original position, and then repeats.

A motor with suitable low-inertia characteristics can respond rapidly to these changes when correctly sized and tuned.

The low-inertia design also helps in applications where the load inertia is relatively small or where rapid servo response is required.

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10. High-Speed Operation

The MPL-B330P-SK74AA has a rated speed of 5000 RPM.

This high-speed capability allows the motor to be used in machinery where the mechanical transmission, spindle, roller, pulley, or other driven component must operate at relatively high rotational speed.

High-speed servo operation can also allow a smaller motor to deliver the required mechanical output when the application is appropriately designed.

However, speed selection must always consider the complete machine.

Couplings, gearboxes, belts, bearings, pulleys, screws, and other mechanical components must all be capable of operating at the required rotational speed.

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11. Continuous and Peak Torque

The continuous torque rating is approximately 4.18 Nm.

The peak torque capability is approximately 11.1 Nm.

Continuous torque is relevant to the thermal loading of the motor during sustained operation.

Peak torque is more relevant to short-duration acceleration, deceleration, and dynamic load requirements.

Torque Parameter	Specification
Model	MPL-B330P-SK74AA
Continuous Torque	4.18 Nm
Peak Torque	11.1 Nm
Peak-to-Continuous Ratio	Approximately 2.66:1
Rated Speed	5000 RPM
Rated Power	1.8 kW

Peak torque should not be interpreted as a torque that the motor can produce continuously.

For proper motor selection, the machine’s RMS torque and duty cycle should be evaluated together with the peak acceleration torque.

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12. Encoder and Feedback System

The MPL-B330P-SK74AA uses a single-turn high-resolution absolute encoder.

The published configuration specifies 1024 Sin/Cos cycles per revolution and a Hiperface feedback protocol.

The encoder provides the servo drive with position and speed information.

This feedback is essential for closed-loop servo control.

The drive continuously compares the commanded motion with the actual motor feedback and adjusts motor current accordingly.

This allows the system to control:

• Position
• Speed
• Acceleration
• Deceleration
• Direction
• Synchronization
• Electronic gearing
• Indexing
• Coordinated multi-axis motion

The single-turn configuration is suitable when the application requires absolute position information within one motor revolution.

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13. Keyless Shaft

The MPL-B330P-SK74AA uses a keyless shaft extension.

This means the shaft does not use a conventional shaft key for coupling torque to the driven mechanism.

A compatible clamping hub, precision coupling, or other appropriate keyless connection can be used depending on the machine design.

Shaft Parameter	Specification
Model	MPL-B330P-SK74AA
Shaft Type	Keyless
Shaft Key	None
Shaft Seal	None
Coupling Requirement	Compatible keyless coupling
Application	Servo-driven mechanical transmission
Primary Selection Factor	Coupling and load interface

A keyless shaft configuration can be useful when a machine designer prefers a clamping-type connection.

The coupling must be correctly sized for the motor’s torque, speed, radial loading, axial loading, and required service life.

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14. Integrated 24 V DC Brake

One of the most important characteristics of the SK74AA configuration is the integrated 24 V DC holding brake.

The brake provides a mechanical holding function when the servo axis needs to remain stationary under appropriate conditions.

This can be particularly useful for vertical axes, positioning mechanisms, or machinery where the axis needs additional mechanical holding after servo torque is removed.

Brake Parameter	Specification
Model	MPL-B330P-SK74AA
Brake	Yes
Brake Voltage	24 V DC
Brake Type	Holding brake
Integrated	Yes
Primary Function	Mechanical holding
Suitable for Vertical-Axis Applications	Potentially, subject to complete machine design
Brake Control	Must be integrated with machine control and safety design

The brake should not automatically be treated as a dynamic stopping device.

For many applications, the servo system performs controlled stopping while the brake is used primarily for holding.

The final brake-control strategy must follow the machine’s safety and control requirements.

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15. Why the Brake Is Important

The SK74AA is particularly useful where the machine needs a motor-mounted holding function.

For example, a vertical axis may have a mechanical load that tends to move downward due to gravity.

In such a system, servo torque can control the axis while powered, but a mechanical holding mechanism may be required when the drive is disabled.

The integrated 24 V DC brake provides an additional mechanical holding function.

The actual holding capacity depends on the complete machine design, including load, mechanical transmission, brake condition, coupling, safety requirements, and installation arrangement.

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16. SpeedTEC DIN Connector

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

The connector can be rotated through approximately 180 degrees.

This is useful when the available installation space is limited.

The connector orientation can be adjusted to improve cable routing and reduce interference with machine covers, neighboring components, cable trays, and structural members.

Connector Parameter	Specification
Model	MPL-B330P-SK74AA
Connector Type	SpeedTEC DIN
Connector Style	Right-angle
Rotation	180° rotatable
Connection Purpose	Motor power and feedback interface
Installation Benefit	Flexible cable routing

A correctly routed cable should have adequate bend radius and should not place excessive mechanical force on the connector.

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17. Mounting Arrangement

The MPL-B330P-SK74AA uses an IEC metric flange mounting arrangement.

The 100 mm frame provides a standardized motor mounting class.

The mounting surface should be sufficiently rigid to prevent vibration or movement during acceleration and deceleration.

Mounting Parameter	Specification
Model	MPL-B330P-SK74AA
Mounting Type	Flange mount
Mounting Standard	IEC metric
Frame Size	100 mm
Mounting Hole Type	Free mounting holes
Hole Designation	Type FF
Shaft	Keyless
Brake	Integrated 24 V DC

The exact mounting-hole pattern and shaft dimensions should be checked against the mechanical drawing before fabrication.

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18. Main Product Advantages

18.1 High-Speed 5000 RPM Operation

The 5000 RPM rating provides a high-speed operating range for industrial machinery.

This is useful for rotating mechanisms, indexing systems, material handling, packaging equipment, and other applications requiring rapid rotary movement.

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18.2 Low-Inertia Construction

The low-inertia motor construction allows fast dynamic response.

This is particularly useful when the machine repeatedly accelerates and decelerates.

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18.3 High Torque-to-Size Ratio

The B330P configuration provides approximately 4.18 Nm continuous torque from a 100 mm frame.

This gives the motor a useful combination of physical size and torque capability.

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18.4 High-Resolution Feedback

The single-turn high-resolution encoder allows the servo system to monitor actual motor position and speed.

This supports precise closed-loop control.

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18.5 Integrated 24 V DC Brake

The integrated brake provides a mechanical holding function without requiring a separate external motor-mounted brake.

This can simplify machine construction when a brake is required.

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18.6 Keyless Shaft

The keyless shaft provides flexibility for compatible clamping couplings and mechanical transmission systems.

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18.7 Rotatable Right-Angle Connector

The 180-degree connector rotation provides additional flexibility for cable routing.

This is valuable in compact machinery.

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18.8 Compact 100 mm Frame

The 100 mm frame provides a relatively compact installation size for the available motor output.

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19. Typical Industrial Applications

The MPL-B330P-SK74AA can be considered for a broad range of industrial servo applications.

Packaging Machinery

Packaging machines often require high-speed indexing and repetitive positioning.

Typical applications include:

• Product indexing
• Filling mechanisms
• Sealing mechanisms
• Cutting mechanisms
• Feeding systems
• Rotary positioning
• Conveyor synchronization
• Labeling systems

The motor’s 5000 RPM rating and low-inertia characteristics can be useful in high-cycle packaging equipment.

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Material Handling

Servo motors can provide controlled acceleration and deceleration in material-handling systems.

Possible applications include:

• Conveyor positioning
• Transfer mechanisms
• Indexing conveyors
• Pick-and-place mechanisms
• Rotary transfer units
• Automated storage mechanisms

The integrated brake can also be useful in selected applications where an axis needs mechanical holding.

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Electronic Assembly

Electronic assembly machines frequently require accurate and repeatable motion.

The high-resolution encoder can support precise position control for:

• Assembly axes
• Indexing tables
• Component handling
• Precision feeders
• Rotary positioning mechanisms
• Automated inspection systems

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Printing and Converting

Printing and converting machinery often requires synchronization between multiple rotating mechanisms.

Servo control can be used for:

• Web feeding
• Roller control
• Registration
• Indexing
• Cutting
• Slitting
• Material positioning

The high-speed capability of the B330P configuration can be useful for appropriate rotary applications.

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Machine Automation

The motor can be used as an axis actuator in automated machinery.

Applications may include:

• Rotary positioning
• Indexing tables
• Automated fixtures
• Feed mechanisms
• Transfer systems
• Tool positioning
• Machine auxiliary axes

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Robotics

The motor can be used in robotic or automated mechanisms when its torque, speed, inertia, and mechanical dimensions meet the requirements of the specific axis.

The final motor selection should always be based on the actual load inertia and torque requirements.

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Textile Machinery

High-speed rotary motion is common in textile machinery.

Potential applications include:

• Feed rollers
• Winding mechanisms
• Positioning systems
• Tension-control mechanisms
• Rotary drives
• Synchronized feed systems

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20. Application Suitability Table

Application	Suitability	Main Characteristics
Packaging	High	Fast indexing and repetitive motion
Material Handling	High	Controlled acceleration and positioning
Electronic Assembly	High	High-resolution feedback
Printing	High	Speed and synchronization
Converting	High	High-speed rotary control
Machine Automation	High	Closed-loop servo positioning
Textile Machinery	High	High-speed operation
Robotics	Application-dependent	Depends on load and axis inertia
Vertical Axis	Suitable with proper evaluation	Integrated brake
Heavy Inertia Load	Requires engineering study	Load inertia must be checked
Fixed-Speed Applications	Not the primary purpose	Requires servo control system

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21. Detailed Electrical and Mechanical Parameter Table

Category	Parameter	Specification
Identification	Model	MPL-B330P-SK74AA
Identification	Brand	Allen-Bradley
Identification	Series	MPL Low-Inertia Servo Motor
Motor	Motor Type	Brushless permanent-magnet servo motor
Motor	Voltage Class	400 V AC
Motor	Armature Voltage	460 V
Motor	Rated Speed	5000 RPM
Motor	Maximum Speed	5000 RPM
Motor	Continuous Torque	4.18 Nm
Motor	Peak Torque	11.1 Nm
Motor	Continuous Power	1.8 kW
Motor	Rotor Inertia	Approximately 0.00013 kg·m²
Mechanical	Frame Size	100 mm
Mechanical	Frame Number	3
Mechanical	Magnet Stack	76.2 mm
Mechanical	Magnet Stack	3.0 in.
Mechanical	Shaft	Keyless
Mechanical	Shaft Seal	No shaft seal
Mechanical	Mounting	IEC metric flange
Mechanical	Mounting Holes	Free mounting holes, Type FF
Mechanical	Brake	24 V DC holding brake
Feedback	Feedback Type	Absolute single-turn
Feedback	Encoder	High-resolution encoder
Feedback	Resolution	1024 Sin/Cos cycles/rev
Feedback	Protocol	Hiperface
Connection	Connector	SpeedTEC DIN
Connection	Connector Type	Right-angle
Connection	Connector Rotation	180°
Environment	Maximum Operating Temperature	Approximately 40 °C
Physical	Motor Weight	Approximately 6.7 kg
Physical	Shipping Weight	Approximately 8 kg
Physical	Frame Dimension	100 mm
Physical	Magnet Stack Dimension	76.2 mm
Physical	Complete Motor Envelope	Configuration-dependent

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22. Five Closely Related Models

The following models are useful for comparison because they share the same general MPL/B330P product family or provide closely related shaft, feedback, or brake configurations.

Model	Frame	Stack	Speed	Feedback	Shaft	Brake
MPL-B330P-SK72AA	100 mm	76.2 mm	5000 RPM	Single-turn high-resolution	Keyless	No brake
MPL-B330P-SJ72AA	100 mm	76.2 mm	5000 RPM	Single-turn high-resolution	Keyed	No brake
MPL-B330P-SJ74AA	100 mm	76.2 mm	5000 RPM	Single-turn high-resolution	Keyed	24 V DC brake
MPL-B330P-MJ74AA	100 mm	76.2 mm	5000 RPM	Absolute multi-turn encoder	Keyed	24 V DC brake
MPL-B330P-MK74AA	100 mm	76.2 mm	5000 RPM	Absolute multi-turn encoder	Keyless	24 V DC brake

These configurations illustrate how the MPL-B330P family can be specified with different feedback systems, shaft arrangements, and brake configurations.

The SK74AA is the single-turn, keyless-shaft, brake-equipped configuration.

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23. MPL-B330P-SK74AA vs. MPL-B330P-SK72AA

The SK72AA is one of the closest comparisons to the SK74AA.

Parameter	MPL-B330P-SK74AA	MPL-B330P-SK72AA
Frame	100 mm	100 mm
Stack	76.2 mm	76.2 mm
Speed	5000 RPM	5000 RPM
Feedback	Single-turn high-resolution	Single-turn high-resolution
Shaft	Keyless	Keyless
Connector	Right-angle SpeedTEC DIN	Right-angle SpeedTEC DIN
Brake	24 V DC	None
Continuous Torque	4.18 Nm	4.18 Nm
Peak Torque	11.1 Nm	11.1 Nm
Power	1.8 kW	1.8 kW
Main Difference	Integrated brake	No integrated brake

The primary difference is the brake.

The SK74AA is appropriate when the machine requires an integrated holding brake, while the SK72AA is the simpler no-brake configuration.

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24. MPL-B330P-SK74AA vs. MPL-B330P-SJ74AA

Another important comparison is between keyless and keyed shaft versions.

Parameter	MPL-B330P-SK74AA	MPL-B330P-SJ74AA
Frame	100 mm	100 mm
Stack	76.2 mm	76.2 mm
Speed	5000 RPM	5000 RPM
Feedback	Single-turn high-resolution	Single-turn high-resolution
Shaft	Keyless	Keyed
Brake	24 V DC	24 V DC
Connector	SpeedTEC DIN	SpeedTEC DIN
Main Difference	Keyless shaft	Keyed shaft

The electrical motor performance is generally based on the same B330P motor size.

The main selection factor is the mechanical interface.

If the machine uses a clamping-style coupling, the SK74AA configuration may be appropriate.

If the machine is designed around a keyed coupling, a keyed-shaft version may be more suitable.

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25. MPL-B330P-SK74AA vs. Multi-Turn Configuration

A single-turn and multi-turn encoder serve different application requirements.

Feature	MPL-B330P-SK74AA	Multi-Turn B330P Configuration
Feedback	Single-turn	Multi-turn
Position Range	One motor revolution	Multiple motor revolutions
Shaft	Keyless	Configuration-dependent
Brake	24 V DC	Configuration-dependent
Speed	5000 RPM class	5000 RPM class
Frame	100 mm	100 mm
Stack	76.2 mm	76.2 mm
Application Focus	Single-turn absolute position	Extended absolute position tracking

The appropriate encoder type depends on how the machine manages absolute position.

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26. Five Representative Same-Brand Models

The following models provide useful comparisons within the same manufacturer’s servo-motor portfolio.

They should be regarded as representative comparison models, rather than a ranking of product popularity.

Model	Rated Speed	Continuous Torque	Peak Torque	Power	Rotor Inertia	Approx. Weight
MPL-B310P	5000 RPM	1.58 Nm	3.61 Nm	0.77 kW	0.000044 kg·m²	2.7 kg
MPL-B320P	5000 RPM	3.05 Nm	7.91 Nm	1.5 kW	0.000078 kg·m²	3.7 kg
MPL-B420P	5000 RPM	4.74 Nm	13.5 Nm	1.9 kW	0.00026 kg·m²	4.3 kg
MPL-B430P	5000 RPM	6.55 Nm	19.8 Nm	2.2 kW	0.00038 kg·m²	5.5 kg
MPL-B4530F	3000 RPM	8.25–8.36 Nm	20.3 Nm	2.1 kW	0.00040 kg·m²	7.3 kg

Published selection data lists the B310P, B320P, B330P, B420P, B430P, B4530F and other MPL configurations with the corresponding speed, torque, power, inertia, and weight values shown above.

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27. MPL-B310P

The MPL-B310P is a lower-output member of the same general B-series servo motor family.

Its continuous torque is approximately 1.58 Nm and its peak torque is approximately 3.61 Nm.

The rated speed is 5000 RPM and the continuous power is approximately 0.77 kW.

Its approximate published weight is 2.7 kg.

It can be considered for servo axes requiring less torque and lower motor mass.

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28. MPL-B320P

The MPL-B320P provides a higher output than the B310P while retaining a 5000 RPM speed rating.

It provides approximately 3.05 Nm continuous torque and 7.91 Nm peak torque.

Its continuous rated power is approximately 1.5 kW.

The approximate published weight is 3.7 kg.

This model can be useful when the B310P does not provide sufficient torque but the B330P would provide more output than required.

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29. MPL-B420P

The MPL-B420P provides approximately 4.74 Nm continuous torque and 13.5 Nm peak torque.

Its rated speed is 5000 RPM and its continuous output is approximately 1.9 kW.

The published weight is approximately 4.3 kg.

It can be considered when a machine requires somewhat more torque than the B330P configuration.

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30. MPL-B430P

The MPL-B430P provides approximately 6.55 Nm continuous torque and 19.8 Nm peak torque.

Its rated speed is 5000 RPM and its continuous output is approximately 2.2 kW.

The published weight is approximately 5.5 kg.

This model is useful as a comparison when the B330P does not provide sufficient continuous or peak torque.

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31. MPL-B4530F

The MPL-B4530F is a larger-output MPL motor configuration operating at a lower 3000 RPM rated speed.

Published data gives approximately 8.25–8.36 Nm continuous torque, 20.3 Nm peak torque, and approximately 2.1 kW output.

Its approximate weight is 7.3 kg.

This configuration is more torque-oriented than the 5000 RPM B330P configuration and can be considered when a machine requires higher torque at a lower rotational speed.

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32. Comparison of the B-Series

Model	Speed	Continuous Torque	Peak Torque	Power	Weight
MPL-B310P	5000 RPM	1.58 Nm	3.61 Nm	0.77 kW	2.7 kg
MPL-B320P	5000 RPM	3.05 Nm	7.91 Nm	1.5 kW	3.7 kg
MPL-B330P	5000 RPM	4.18 Nm	11.1 Nm	1.8 kW	4.6 kg
MPL-B420P	5000 RPM	4.74 Nm	13.5 Nm	1.9 kW	4.3 kg
MPL-B430P	5000 RPM	6.55 Nm	19.8 Nm	2.2 kW	5.5 kg
MPL-B4530F	3000 RPM	8.25–8.36 Nm	20.3 Nm	2.1 kW	7.3 kg
MPL-B4540F	3000 RPM	10.2 Nm	27.1 Nm	2.6 kW	8.6 kg
MPL-B4560F	3000 RPM	14.1 Nm	34.4 Nm	3.2 kW	11.82 kg

The B-series data illustrates the progression from smaller, lower-torque motors to larger motors with higher continuous and peak torque.

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33. Servo Drive Compatibility

The MPL-B330P-SK74AA is intended to operate as part of a servo motion-control system rather than as a standalone motor.

Published technical information identifies compatible drive families including various Kinetix and Ultra servo-drive platforms.

When selecting a drive, the following parameters should be checked:

• Motor voltage
• Motor current
• Continuous torque
• Peak torque
• Motor speed
• Feedback type
• Encoder protocol
• Encoder resolution
• Brake control
• Regenerative energy
• Motion profile
• Load inertia
• Communication architecture

The motor and servo drive must be treated as one motion-control system.

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34. Load Inertia Considerations

The motor’s low rotor inertia does not mean that the machine can accept any load without additional engineering.

The driven load may have substantially higher inertia than the motor rotor.

For example, a large roller connected through a direct coupling can have considerably greater rotational inertia than the motor.

A gearbox or belt transmission can change the inertia reflected to the motor.

Therefore, motor selection should consider:

• Motor inertia
• Load inertia
• Gear ratio
• Acceleration time
• Deceleration time
• Cycle frequency
• Continuous torque
• Peak torque
• Required positioning accuracy
• Required settling time

A motor that is correctly sized for steady-state torque may still be incorrectly sized for rapid acceleration.

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35. Thermal Considerations

The continuous torque rating is strongly related to the motor’s thermal capability.

If the motor operates continuously near its rated torque, heat generation can become significant.

The actual thermal condition depends on:

• Ambient temperature
• Installation orientation
• Mounting structure
• Cooling conditions
• Motor speed
• Duty cycle
• RMS torque
• Acceleration frequency
• Mechanical load

For this reason, a motor should not be selected using peak torque alone.

The machine’s complete motion profile should be analyzed.

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36. Brake Application Considerations

The integrated brake makes the SK74AA particularly useful for applications where mechanical holding is required.

Typical examples include:

• Vertical lifting axes
• Vertical positioning mechanisms
• Z-axis machinery
• Gravity-loaded mechanisms
• Holding mechanisms
• Equipment requiring mechanical holding after servo disable

However, the brake should be correctly integrated into the control sequence.

The servo drive normally controls the motor’s stopping motion, while the brake provides mechanical holding when appropriate.

The actual brake timing should be coordinated with the servo enable, motor speed, and machine safety system.

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37. Installation Recommendations

The motor should be installed on a rigid and accurately machined mounting surface.

The motor flange should be securely fastened.

The shaft coupling should be properly aligned.

Excessive misalignment can increase bearing loads and vibration.

The motor cable should be routed without excessive bending or pulling force.

The right-angle connector should be oriented so that the cable has adequate clearance from surrounding machine components.

The brake wiring should be separated and controlled according to the machine’s electrical design.

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38. Maintenance

Routine maintenance should include inspection of the motor and its surrounding mechanical system.

Recommended inspection points include:

• Mounting bolts
• Motor flange
• Shaft coupling
• Connector
• Motor cable
• Brake wiring
• Abnormal vibration
• Abnormal noise
• Motor temperature
• Shaft movement
• Feedback stability
• Mechanical alignment

If the motor develops abnormal noise or vibration, the entire mechanical system should be checked.

A servo motor fault can sometimes be caused by a coupling, bearing, load, cable, feedback, or tuning problem rather than by the motor itself.

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39. Troubleshooting Guide

Symptom	Possible Area to Check
Motor does not rotate	Servo enable, drive alarm, power wiring
Position error	Encoder feedback, tuning, mechanical load
Excessive vibration	Coupling alignment, tuning, mechanical resonance
Motor overheats	Continuous torque, duty cycle, cooling
Brake does not release	24 V DC brake circuit and control sequence
Unexpected movement after disable	Brake control and mechanical holding system
Feedback alarm	Encoder cable, connector, drive compatibility
Excessive noise	Bearings, coupling, mechanical resonance
Poor positioning accuracy	Feedback, mechanical backlash, tuning
Slow acceleration	Load inertia, current limit, torque requirement

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40. Advantages for Machine Builders

The MPL-B330P-SK74AA offers several characteristics that can simplify machine design.

The 100 mm frame provides a standardized mechanical format.

The 5000 RPM speed rating supports high-speed rotary applications.

The low-inertia construction supports rapid acceleration and deceleration.

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

The keyless shaft allows the use of compatible clamping couplings.

The integrated 24 V DC brake provides a built-in holding mechanism.

The rotatable right-angle connector gives flexibility when routing motor cables.

Together, these characteristics make the motor suitable for compact automated machinery requiring controlled rotary motion.

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41. Product Selection Checklist

Before selecting the MPL-B330P-SK74AA for a new machine, verify the following:

Selection Item	Required Check
Model	MPL-B330P-SK74AA
Voltage	460 V AC class
Continuous Torque	Application should remain within allowable torque
Peak Torque	Acceleration and transient loads must be checked
Speed	Required speed should be compatible with 5000 RPM rating
Load Inertia	Motor/load inertia relationship must be evaluated
Feedback	Single-turn high-resolution encoder compatibility
Shaft	Keyless coupling required
Brake	24 V DC brake required if mechanical holding is needed
Mounting	100 mm IEC metric arrangement
Stack	76.2 mm
Connector	SpeedTEC DIN right-angle connector
Cable Routing	Allow sufficient connector clearance
Weight	Approximately 6.7 kg
Environment	Temperature and installation conditions must be checked
Drive	Compatible servo drive required

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42. Quick Reference Specification

Parameter	Specification
Model	MPL-B330P-SK74AA
Brand	Allen-Bradley
Series	MPL Low-Inertia Servo Motors
Product Type	Rotary Servo Motor
Voltage	460 V AC
Voltage Class	400 V AC
Frame	100 mm
Stack	76.2 mm
Speed	5000 RPM
Continuous Torque	4.18 Nm
Peak Torque	11.1 Nm
Rated Power	1.8 kW
Rotor Inertia	Approximately 0.00013 kg·m²
Feedback	Single-turn high-resolution encoder
Feedback Resolution	1024 Sin/Cos cycles/rev
Protocol	Hiperface
Shaft	Keyless
Shaft Seal	None
Brake	24 V DC holding brake
Connector	SpeedTEC DIN
Connector Style	Right-angle
Connector Rotation	180°
Mounting	IEC metric
Frame Dimension	100 mm
Magnet Stack Dimension	76.2 mm
Motor Weight	Approximately 6.7 kg
Shipping Weight	Approximately 8 kg
Operating Temperature	Approximately 40 °C maximum reference
Application	Industrial servo motion control

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43. Product Advantages Summary

Advantage	Description
High-Speed Operation	5000 RPM rated speed
Low-Inertia Response	Suitable for frequent acceleration and deceleration
High Continuous Torque	4.18 Nm
High Peak Torque	11.1 Nm
1.8 kW Output	Suitable for medium-duty servo applications
High-Resolution Feedback	Supports accurate closed-loop control
Single-Turn Absolute Feedback	Provides absolute position information within one revolution
Keyless Shaft	Flexible mechanical coupling
24 V DC Brake	Provides integrated holding function
100 mm Frame	Compact industrial mounting format
76.2 mm Stack	Standard B330P stack configuration
Rotatable Connector	Flexible cable routing
IEC Metric Mounting	Standardized mounting arrangement

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44. Final Product Description

The MPL-B330P-SK74AA is a 460 V AC, 5000 RPM, low-inertia brushless rotary servo motor designed for high-performance industrial motion-control applications.

It uses a 100 mm frame and a 76.2 mm magnet stack, providing a compact motor configuration for machinery requiring controlled rotary motion.

The B330P motor configuration provides approximately 4.18 Nm continuous torque, 11.1 Nm peak torque, and 1.8 kW continuous rated power.

The motor uses a single-turn high-resolution absolute encoder with 1024 Sin/Cos cycles per revolution and Hiperface feedback.

Its keyless shaft is designed for compatible clamping-type mechanical connections, while the integrated 24 V DC holding brake provides a mechanical holding function for applications where a brake is required.

The SpeedTEC DIN right-angle connector can be rotated through approximately 180 degrees, providing additional flexibility for cable routing and machine installation.

The combination of low rotor inertia and 5000 RPM operating speed makes the motor suitable for machinery involving repeated acceleration and deceleration.

Typical applications include packaging equipment, indexing machines, material-handling systems, electronic assembly equipment, printing and converting machinery, automated production equipment, textile machinery, and selected robotic or positioning systems.

The integrated brake is particularly useful when the machine requires mechanical holding in addition to servo control.

For vertical or gravity-loaded applications, the brake configuration can provide an important mechanical holding function, although the complete axis must still be engineered for the actual load and safety requirements.

The MPL-B330P-SK74AA is therefore best characterized as a compact, high-speed, low-inertia servo motor with high-resolution single-turn feedback, a keyless shaft, and an integrated 24 V DC holding brake.

Its principal technical characteristics can be summarized as follows: 100 mm frame, 76.2 mm stack, 5000 RPM, 4.18 Nm continuous torque, 11.1 Nm peak torque, 1.8 kW output, single-turn high-resolution encoder, keyless shaft, 24 V DC brake, SpeedTEC DIN connector, and approximately 6.7 kg motor weight.

For replacement work, the complete MPL-B330P-SK74AA part number should be matched carefully because changing the final configuration can change the feedback type, shaft arrangement, brake configuration, connector arrangement, or other mechanical characteristics.