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Allen-Bradley MPL-B4540F-RJ74AA Low-Inertia Servo Motor

1. Product Overview

The Allen-Bradley MPL-B4540F-RJ74AA is a high-performance AC rotary servo motor from the MP-Series MPL Low-Inertia Servo Motor Series. It is designed for demanding industrial motion-control applications where accurate positioning, fast acceleration and deceleration, repeatable speed control, and reliable torque performance are required.

This model combines a compact 130 mm frame with a 101.6 mm magnet stack and a rated speed of 3000 rpm. It uses resolver feedback for motor position and speed feedback, a keyed shaft extension for positive mechanical torque transmission, and a built-in 24 V DC holding brake for applications where the shaft must be mechanically held when motor power is removed.

The motor is designed around a 460 V AC class electrical system and is commonly associated with 480 V AC industrial servo applications. Its continuous stall torque is approximately 10.2 N·m, with a peak torque capability of approximately 27.1 N·m, giving the motor a useful combination of continuous load capability and short-duration acceleration performance.

The motor uses a right-angle SpeedTEC DIN connector arrangement with 180° rotational flexibility. This configuration is particularly useful in machinery where cable routing space is limited or where the motor orientation makes a straight connector inconvenient.

The RJ74AA configuration is especially suitable when a holding brake is required. The integrated 24 V DC brake can help maintain shaft position when the servo system is disabled, making this configuration more suitable than the no-brake version for vertical axes, lifting mechanisms, positioning axes, and applications where uncontrolled movement after power removal must be minimized.

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2. Brand and Series Information

Item	Specification
Brand	Allen-Bradley
Product Family	MP-Series
Product Series	MPL Low-Inertia Servo Motor Series
Product Type	Brushless AC Rotary Servo Motor
Model	MPL-B4540F-RJ74AA
Motor Configuration	Low-Inertia Servo Motor
Voltage Class	460 V AC / 480 V AC application class
Feedback	Resolver
Shaft Configuration	Keyed Shaft Extension
Brake	24 V DC Holding Brake
Mounting	IEC Metric Flange
Connector	SpeedTEC DIN Connector
Connector Position	Right-Angle
Connector Rotation	180° Rotatable
Frame Size	130 mm
Magnet Stack	101.6 mm
Rated Speed	3000 rpm

The model belongs to the MPL family of low-inertia brushless servo motors. Within the model designation, B45 identifies the 130 mm frame class, 40 identifies the 101.6 mm magnet-stack length, F identifies the 3000 rpm class, R identifies resolver feedback, J identifies the keyed shaft configuration, 7 identifies the right-angle rotatable SpeedTEC connector configuration, and 4 identifies the 24 V DC brake option.

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3. Detailed Technical Specifications

The following table summarizes the principal specifications of the MPL-B4540F-RJ74AA.

Parameter	Specification
Model	MPL-B4540F-RJ74AA
Brand	Allen-Bradley
Series	MPL Low-Inertia Servo Motor
Product Family	MP-Series
Motor Type	Brushless AC Rotary Servo Motor
Motor Technology	Permanent-Magnet Synchronous Servo Motor
Rated Voltage Class	460 V AC
Application Voltage Class	480 V AC
Phase	2-pole motor configuration
Rated Speed	3000 rpm
Continuous Stall Torque	Approx. 10.2 N·m
Peak Torque	Approx. 27.1 N·m
Rated Output	Approx. 2.6 kW
Feedback Type	Resolver
Shaft Type	Keyed Shaft Extension
Brake	24 V DC Holding Brake
Connector	SpeedTEC DIN
Connector Style	Right Angle
Connector Rotation	180° Rotatable
Mounting Standard	IEC Metric
Mounting Holes	Free Mounting Holes, Type FF
Frame Size	130 mm
Magnet Stack Length	101.6 mm
Frame Size in Inches	Approx. 5.12 in.
Magnet Stack in Inches	Approx. 4.00 in.
Overall Motor Length	Approx. 330 mm class
Weight	Approx. 13 kg
Enclosure / Protection Class	IP50 class
Motor Construction	Low-Inertia Brushless Servo
Shaft Connection	Keyed
Brake Application	Shaft holding / positioning
Feedback Application	Closed-loop position and speed control

The 10.2 N·m continuous torque rating makes the motor suitable for sustained industrial loads, while the approximately 27.1 N·m peak torque provides additional capacity during acceleration, deceleration, short-duration overload conditions, and dynamic positioning.

The 2.6 kW power class places this motor in a useful middle range for industrial servo axes. It is large enough for substantial machine loads while remaining relatively compact compared with higher-torque servo motors.

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4. Dimensions and Mechanical Characteristics

Mechanical dimensions are especially important when replacing an existing servo motor because mounting-hole position, shaft geometry, connector orientation, overall length, and motor mass all affect machine compatibility.

Mechanical Parameter	Specification
Model	MPL-B4540F-RJ74AA
Frame Diameter / Frame Size	130 mm
Magnet Stack Length	101.6 mm
Frame Size	Approx. 5.12 in.
Stack Length	Approx. 4.00 in.
Overall Length	Approx. 330 mm class
Mounting Standard	IEC Metric
Mounting Flange	Metric flange
Mounting Hole Configuration	Free Mounting Holes, Type FF
Shaft Type	Keyed Shaft Extension
Connector Type	SpeedTEC DIN
Connector Orientation	Right Angle
Connector Adjustment	180° Rotatable
Brake	Integrated 24 V DC Brake
Weight	Approx. 13 kg

The 130 mm frame size provides a relatively compact mounting envelope for a motor capable of delivering approximately 10.2 N·m continuous torque.

The 101.6 mm magnet stack is one of the defining characteristics of the B4540F configuration. Compared with shorter-stack motors in the same frame family, this configuration provides a higher torque capability while retaining the same general frame diameter.

The approximate 13 kg motor weight should be considered when designing mounting brackets, machine structures, vertical-axis assemblies, and robotic or gantry systems. Actual shipping or installed weight may vary slightly depending on production revision and packaging.

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5. Model Number Explanation

The model designation provides useful information about the motor configuration.

Model Code	Meaning
MPL	MPL Low-Inertia Servo Motor Series
B	460 V class motor configuration
45	130 mm frame size
40	101.6 mm magnet stack
F	3000 rpm speed class
R	Resolver feedback
J	Keyed shaft extension
7	Right-angle, 180° rotatable SpeedTEC DIN connector
4	24 V DC brake
AA	Product configuration / revision designation

This coding system makes it easier to compare closely related motors. For example, models with the same B4540F base configuration generally retain the same frame and magnet-stack dimensions, while changes in the final configuration code can specify different feedback, shaft, connector, or brake arrangements.

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6. Product Introduction

The MPL-B4540F-RJ74AA is designed for industrial motion systems that require controlled acceleration, controlled deceleration, accurate positioning, and repeatable operation.

Unlike a conventional induction motor used primarily for constant-speed operation, a servo motor operates as part of a closed-loop motion system. The motor, feedback device, servo drive, and motion controller work together to regulate shaft position, velocity, and torque.

The low-inertia construction of the MPL series is particularly useful for applications involving frequent starts and stops. A lower rotor inertia allows the servo drive to change motor speed quickly, which can improve machine cycle time and positioning response.

For example, in a packaging machine, the motor may repeatedly accelerate from standstill to operating speed, move a mechanism to a specific position, decelerate, stop, and immediately reverse direction. A low-inertia servo motor is well suited to this type of operating cycle.

The resolver feedback system provides the drive with motor position information for closed-loop control. This allows the motor to participate in coordinated motion systems where repeatability and controlled movement are important.

The built-in 24 V DC brake is one of the key differences between the RJ74AA and no-brake configurations. The brake is useful when the motor shaft needs to remain stationary after the servo output is disabled.

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7. Main Performance Characteristics

7.1 Low-Inertia Design

The MPL series is designed around low rotor inertia and fast dynamic response.

This characteristic is valuable in applications where the motor must repeatedly accelerate and decelerate. Lower inertia allows the drive system to change motor speed more rapidly and can reduce the amount of time required for a motion cycle.

Typical applications include indexing machines, material handling systems, packaging equipment, machine tools, printing equipment, and automated production machinery.

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7.2 10.2 N·m Continuous Torque

The MPL-B4540F-RJ74AA provides approximately 10.2 N·m of continuous stall torque.

This torque level makes the motor suitable for medium-duty industrial axes where a compact servo motor is preferred but the machine still requires substantial continuous torque.

The motor is also capable of approximately 27.1 N·m peak torque, allowing it to handle short-duration dynamic torque requirements significantly above its continuous torque level.

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7.3 3000 rpm Speed Class

The motor is designed for a 3000 rpm speed class.

This speed provides a useful balance between torque production and rotational speed. It is suitable for applications requiring relatively fast mechanical movement without moving into the higher-speed range associated with some smaller servo motors.

For rotary mechanisms, belt drives, screw drives, indexing systems, and gear-reduced axes, 3000 rpm can provide a practical operating point.

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7.4 Resolver Feedback

The motor uses a resolver for feedback.

A resolver is a rugged rotary feedback device that can provide reliable rotor-position information in industrial environments.

Resolver feedback can be particularly useful in machinery where environmental durability, long service life, and reliable position feedback are important considerations.

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7.5 Integrated 24 V DC Holding Brake

The RJ74AA configuration includes a 24 V DC brake.

The brake is useful when the motor shaft needs to remain stationary while the servo drive is disabled or power is removed.

Typical examples include:

• Vertical lifting axes
• Z-axis machine-tool mechanisms
• Automated positioning stages
• Material-handling mechanisms
• Conveyor elevation systems
• Robotic vertical axes
• Screw-driven vertical slides
• Equipment requiring shaft holding during maintenance or shutdown

The brake should be treated as a holding device rather than as the primary dynamic stopping mechanism. Normal machine deceleration should generally be controlled through the servo system itself, with the brake used for holding when appropriate.

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8. Key Product Advantages

8.1 Compact Torque-to-Size Ratio

One of the major advantages of the MPL-B4540F-RJ74AA is the combination of a 130 mm frame with approximately 10.2 N·m continuous torque.

This allows machine designers to obtain useful servo performance without moving immediately to a substantially larger motor frame.

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8.2 Fast Dynamic Response

The low-inertia design supports rapid acceleration and deceleration.

This is especially valuable in machines where the motor repeatedly changes speed or direction. Fast dynamic response can help reduce cycle time and improve machine throughput.

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8.3 High Peak Torque Capability

The approximately 27.1 N·m peak torque rating gives the motor considerable short-duration torque capacity compared with its continuous rating.

This is useful for acceleration, short-term load changes, indexing, and other dynamic operating conditions.

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8.4 Integrated Brake

The integrated 24 V DC holding brake makes this version particularly attractive for vertical or mechanically sensitive axes.

The brake can help prevent unintended shaft rotation when the servo system is not actively controlling the motor.

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8.5 Keyed Shaft Design

The keyed shaft provides a positive mechanical connection between the motor and driven equipment.

This configuration is commonly useful with couplings, gearboxes, belt mechanisms, pulleys, and other mechanical transmission components where a keyed connection is preferred.

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8.6 Flexible Connector Orientation

The right-angle SpeedTEC DIN connector can be rotated through approximately 180°.

This gives the machine builder greater freedom when routing motor cables.

It is particularly helpful in compact cabinets and machinery where straight cable connectors could interfere with covers, guards, adjacent motors, or structural components.

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8.7 Resolver-Based Feedback

The resolver feedback system is well suited to industrial closed-loop motion applications.

Its relatively rugged construction makes it attractive for machinery where reliable feedback is more important than using an extremely high-resolution encoder architecture.

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8.8 IEC Metric Mounting

The IEC metric mounting arrangement simplifies integration into equipment designed around metric mechanical dimensions.

The free-mounting-hole configuration also gives the machine designer additional flexibility when matching the motor to a specific mechanical structure.

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9. Typical Applications

9.1 CNC Machinery

The MPL-B4540F-RJ74AA can be used for CNC machine axes requiring controlled acceleration, positioning accuracy, and repeatable motion.

It can be considered for feed mechanisms, indexing axes, rotary mechanisms, tool-handling systems, and other controlled machine movements.

The integrated brake can be especially useful for vertical machine axes where shaft holding is required.

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9.2 Packaging Machinery

Packaging equipment frequently requires rapid acceleration, deceleration, indexing, and synchronized motion.

The low-inertia characteristics of the MPL motor make it suitable for mechanisms that repeatedly change speed.

Possible applications include:

• Indexing mechanisms
• Product positioning
• Film-feed systems
• Cutting mechanisms
• Labeling systems
• Carton handling
• Pick-and-place mechanisms
• Rotary indexing tables

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9.3 Material Handling

Servo motors are widely used in automated material-handling equipment where movement must be controlled precisely.

The MPL-B4540F-RJ74AA can be applied to conveyor positioning, transfer mechanisms, lifting systems, indexing equipment, and other automated material-handling axes.

The 24 V DC brake provides an additional benefit for vertical applications.

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9.4 Robotics and Automated Machinery

The compact frame and low-inertia design can make this motor suitable for selected robotic and automated-machine axes.

It can be used where accurate positioning and repeated motion are required.

Applications can include:

• Automated assembly
• Pick-and-place equipment
• Rotary indexing
• Machine tending
• Automated fixtures
• Servo-driven mechanisms

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9.5 Printing and Converting Equipment

Printing and converting machinery often requires accurate speed regulation and synchronization.

Servo motors can be used for web handling, indexing, roller control, cutting, positioning, and other coordinated machine functions.

The low-inertia characteristics can be useful when rapid speed changes are required.

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9.6 Food and Packaging Production Machinery

Automated food and packaging machinery frequently requires precise servo positioning and repetitive motion.

The MPL-B4540F-RJ74AA can be considered for servo axes controlling conveyors, indexing systems, cutters, sealers, feeders, and other mechanisms.

The final suitability should always be evaluated against the machine’s environmental, washdown, temperature, and protection requirements.

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10. Advantages of the RJ74AA Configuration

The RJ74AA version is particularly useful when a machine requires the combination of resolver feedback, keyed shaft transmission, and an integrated holding brake.

Compared with the no-brake RJ72AA configuration, the RJ74AA is better suited to applications where shaft holding is important.

Feature	MPL-B4540F-RJ74AA
Feedback	Resolver
Shaft	Keyed
Brake	24 V DC
Speed	3000 rpm
Continuous Torque	Approx. 10.2 N·m
Peak Torque	Approx. 27.1 N·m
Power Class	Approx. 2.6 kW
Frame	130 mm
Stack	101.6 mm
Weight	Approx. 13 kg

The main selection advantage is therefore not simply motor power. It is the combination of low inertia + resolver feedback + keyed shaft + 24 V brake + 130 mm frame + 3000 rpm operation.

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11. Five Related Models from the Same Series

The following models are closely related to the MPL-B4540F-RJ74AA and are useful when selecting alternatives for different machine configurations.

Model	Speed	Continuous Torque	Peak Torque	Power Class	Feedback	Shaft	Brake	Size	Weight
MPL-B4540F-RJ72AA	3000 rpm	10.2 N·m	27.1 N·m	Approx. 2.6 kW	Resolver	Keyed	No	130 × 101.6 mm	Approx. 11 kg
MPL-B4540F-RK72AA	3000 rpm	10.2 N·m	27.1 N·m	Approx. 2.6 kW	Resolver	Keyless	No	130 × 101.6 mm	Approx. 10–11 kg
MPL-B4540F-RK74AA	3000 rpm	10.2 N·m	27.1 N·m	Approx. 2.6 kW	Resolver	Keyless	24 V DC	130 × 101.6 mm	Approx. 13 kg class
MPL-B4530F-RJ72AA	3000 rpm	Approx. 8.25 N·m	Approx. 20.3 N·m	Approx. 2.1 kW	Resolver	Keyed	No	130 × 76.2 mm	Approx. 8 kg
MPL-B4560F-RJ72AA	3000 rpm	Approx. 14.1 N·m	Approx. 34.4 N·m	Approx. 3.2 kW	Resolver	Keyed	No	130 × 152.4 mm	Approx. 12 kg

MPL-B4540F-RJ72AA

This is the closest alternative to the target motor.

It retains the same basic B4540F motor configuration, resolver feedback, keyed shaft, 130 mm frame, 101.6 mm magnet stack, 3000 rpm speed class, and approximately 10.2 N·m continuous torque.

The major difference is the absence of the 24 V DC holding brake.

For horizontal axes where a holding brake is unnecessary, the RJ72AA configuration can be a more straightforward selection.

MPL-B4540F-RK72AA

The RK72AA version provides the same general motor size and performance class but uses a keyless shaft arrangement.

This can be useful when the mechanical transmission system is designed around a clamping hub, shrink disc, or other keyless coupling arrangement.

MPL-B4540F-RK74AA

The RK74AA combines the keyless shaft configuration with the 24 V DC holding brake.

It is particularly useful when the machine requires a brake but the mechanical designer prefers a keyless shaft connection.

MPL-B4530F-RJ72AA

The B4530F uses the same general 130 mm frame class but a shorter 76.2 mm magnet stack.

Its torque and power capability are lower than the B4540F, making it suitable when the machine load does not require the additional torque of the 101.6 mm stack.

The shorter motor configuration can also be attractive where machine space is limited.

MPL-B4560F-RJ72AA

The B4560F uses a longer 152.4 mm magnet stack.

It provides substantially more continuous and peak torque than the B4540F configuration and is therefore a useful choice when the machine requires greater torque while remaining within the same general frame family.

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12. Five Popular Models from the Same Brand

The following models are useful reference points when comparing different servo configurations and performance levels.

Model	Series / Feedback	Speed	Continuous Torque	Peak Torque	Power Class	Size	Brake	Weight
MPL-B4540F-MJ74AA	MPL / Multi-turn absolute	3000 rpm	10.2 N·m	27.1 N·m	Approx. 2.6 kW	130 × 101.6 mm	24 V DC	Approx. 10–11 kg class
MPL-B4540F-MK74AA	MPL / Multi-turn absolute	3000 rpm	10.2 N·m	27.1 N·m	Approx. 2.6 kW	130 × 101.6 mm	24 V DC	Approx. 10–12 kg class
MPL-B4540F-HJ74AA	MPL / High-resolution incremental	3000 rpm	10.2 N·m	27.1 N·m	Approx. 2.6 kW	130 × 101.6 mm	24 V DC	Approx. 11 kg class
MPL-B4560F-MJ74AA	MPL / Multi-turn absolute	3000 rpm	Approx. 14.1 N·m	Approx. 34.4 N·m	Approx. 3.2 kW	130 × 152.4 mm	24 V DC	Approx. 11.8 kg
MPL-B540K-MJ74AA	MPL / Multi-turn absolute	4000 rpm	Approx. 19.4 N·m	Approx. 48.6 N·m	Approx. 5.4 kW	Approx. 165 × 101.6 mm	24 V DC	Approx. 15 kg

These models cover several different selection requirements.

The MPL-B4540F-MJ74AA is particularly close to the target motor mechanically, but uses multi-turn high-resolution absolute feedback rather than resolver feedback.

The MPL-B4540F-MK74AA offers a similar performance level with a different shaft configuration, making it useful when the mechanical connection does not require a keyed shaft.

The MPL-B4540F-HJ74AA is another closely related option for applications where high-resolution incremental feedback is preferred.

The MPL-B4560F-MJ74AA moves into a higher torque range. It is appropriate when the B4540F’s approximately 10.2 N·m continuous torque is insufficient.

The MPL-B540K-MJ74AA represents a larger and higher-performance option for applications requiring substantially greater torque and higher operating speed.

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13. Comparison Between the Target Motor and Closest Alternatives

Model	Frame	Stack	Speed	Continuous Torque	Feedback	Shaft	Brake	Typical Selection Reason
MPL-B4540F-RJ74AA	130 mm	101.6 mm	3000 rpm	10.2 N·m	Resolver	Keyed	Yes	Balanced performance with brake
MPL-B4540F-RJ72AA	130 mm	101.6 mm	3000 rpm	10.2 N·m	Resolver	Keyed	No	Horizontal / non-braked axes
MPL-B4540F-RK74AA	130 mm	101.6 mm	3000 rpm	10.2 N·m	Resolver	Keyless	Yes	Brake + keyless mechanical connection
MPL-B4530F-RJ72AA	130 mm	76.2 mm	3000 rpm	8.25 N·m	Resolver	Keyed	No	Lower torque and shorter stack
MPL-B4560F-RJ72AA	130 mm	152.4 mm	3000 rpm	14.1 N·m	Resolver	Keyed	No	Higher torque requirement

This comparison shows why the MPL-B4540F-RJ74AA is a balanced choice within the family.

It is not the smallest motor in the range, nor is it the highest-torque configuration. Instead, it occupies a useful middle position with approximately 10.2 N·m continuous torque, 27.1 N·m peak torque, 3000 rpm speed, 130 mm frame size, resolver feedback, keyed shaft, and an integrated 24 V DC brake.

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14. Selection Advantages for Machine Designers

When selecting a servo motor, torque alone should not determine the final choice.

The motor must also be evaluated against inertia, acceleration requirements, load characteristics, mechanical transmission ratio, duty cycle, feedback requirements, brake requirements, mounting dimensions, cable routing, and environmental conditions.

The MPL-B4540F-RJ74AA provides a practical combination of these characteristics.

For a machine requiring approximately 10 N·m of continuous torque, the motor provides enough capacity for many medium-sized servo axes while retaining a relatively compact 130 mm frame.

For dynamic motion, the low-inertia design helps the motor respond quickly to speed commands.

For positioning systems, the resolver provides closed-loop feedback.

For vertical or holding applications, the integrated 24 V DC brake adds mechanical holding capability.

For machine integration, the right-angle connector and 180° rotation capability provide additional flexibility for cable routing.

For mechanical transmission, the keyed shaft provides a conventional and robust connection method.

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15. Typical Machine Functions

The MPL-B4540F-RJ74AA can be considered for a wide range of servo-controlled machine functions, including:

Machine Function	Suitability
CNC Feed Axis	High
Vertical Positioning Axis	High, with brake
Packaging Indexing	High
Rotary Indexing Table	High
Conveyor Positioning	High
Pick-and-Place Mechanism	High
Automated Assembly	High
Material Handling	High
Machine Tool Auxiliary Axis	High
Printing / Converting Axis	High
Cutting Mechanism	High
Feeder Mechanism	High
Robotic Auxiliary Axis	Application dependent
Hoisting / Vertical Load	Suitable with proper brake and safety design
High-Speed Spindle	Generally not the primary selection; speed class is 3000 rpm

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16. Installation and Selection Considerations

Before replacing another servo motor with the MPL-B4540F-RJ74AA, the following parameters should be checked carefully.

First, verify the mechanical mounting dimensions. The 130 mm frame and 101.6 mm stack length determine the primary motor envelope.

Second, verify the shaft configuration. This model uses a keyed shaft. The driven coupling, gearbox, pulley, or other mechanical component must be compatible with the shaft dimensions and key arrangement.

Third, verify the brake requirement. The RJ74AA contains a 24 V DC brake. The machine’s electrical design must provide the appropriate brake control arrangement.

Fourth, verify the feedback interface. This model uses resolver feedback, so the associated servo drive and control architecture must support the required feedback technology.

Fifth, check the connector orientation and cable routing. The right-angle SpeedTEC connector is rotatable, but sufficient clearance must still be provided around the motor.

Sixth, check the load inertia and acceleration profile. Servo sizing should account for the reflected load inertia, transmission ratio, acceleration time, deceleration time, duty cycle, and peak torque demand.

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17. Why Choose MPL-B4540F-RJ74AA?

The MPL-B4540F-RJ74AA is a strong choice when the application requires a combination of:

• 3000 rpm servo operation
• Approximately 10.2 N·m continuous torque
• Approximately 27.1 N·m peak torque
• Approximately 2.6 kW power class
• Low-inertia motor construction
• Resolver feedback
• Keyed shaft connection
• Integrated 24 V DC holding brake
• 130 mm frame
• 101.6 mm magnet stack
• IEC metric mounting
• Right-angle SpeedTEC DIN connection
• 180° connector rotation
• Compact industrial servo construction

The motor is particularly well suited to industrial automation equipment where accurate motion, repeatability, rapid response, and mechanical holding capability are important.

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18. Overall Product Evaluation

The Allen-Bradley MPL-B4540F-RJ74AA can be regarded as a well-balanced industrial servo motor for medium-duty motion-control applications.

Its approximately 10.2 N·m continuous torque and 27.1 N·m peak torque provide a useful operating range for many automated machine axes.

The 3000 rpm speed class is appropriate for general-purpose servo positioning and speed-control applications.

The resolver feedback provides a rugged closed-loop feedback solution, while the keyed shaft supports conventional mechanical power transmission.

The integrated 24 V DC brake is one of the most important features of this specific configuration. It makes the motor more appropriate for vertical positioning and shaft-holding applications than equivalent no-brake configurations.

The 130 mm frame and 101.6 mm stack provide a good compromise between motor size and torque output.

Overall, the MPL-B4540F-RJ74AA is best suited to industrial machinery that needs a compact, low-inertia servo motor with resolver feedback, a conventional keyed shaft, and integrated holding-brake functionality.

For machine builders replacing an existing servo motor, the most important points to verify are the frame and mounting dimensions, shaft dimensions, brake requirements, resolver compatibility, servo-drive compatibility, motor cable arrangement, load inertia, continuous torque requirement, peak torque requirement, and machine duty cycle.