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MPL-B420P-MK72AA Low-Inertia Servo Motor

1. Product Overview

The MPL-B420P-MK72AA is a high-speed, low-inertia brushless rotary servo motor designed for industrial automation, precision motion control, automated machinery and high-performance positioning applications.

It belongs to the MP-Series MPL low-inertia servo motor family and is configured for a 460 V AC class, 5000 RPM operating speed and 115 mm frame size. The motor uses a 50.8 mm magnet stack and a multi-turn high-resolution absolute encoder, providing accurate feedback for closed-loop motion control.

The model features a keyless shaft extension, a right-angle SpeedTEC DIN connector with 180-degree rotational adjustment, and a no-brake configuration. The IEC metric mounting arrangement and compact low-inertia construction make it suitable for integration into a wide range of automated production systems.

The MPL-B420P-MK72AA is particularly appropriate for machines that require repeated acceleration and deceleration, rapid indexing, accurate positioning, synchronized movement and relatively short machine cycle times.

Its combination of high rotational speed, compact construction, low rotor inertia, high torque capability and absolute feedback makes it suitable for demanding motion-control applications where conventional induction motors or general-purpose motors may not provide the required dynamic response.

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2. Brand and Product Series

Item	Description
Brand	Allen-Bradley
Product Family	MP-Series
Product Series	MPL Low-Inertia Servo Motors
Product Type	Brushless Rotary Servo Motor
Motor Configuration	Low-Inertia Servo Motor
Model	MPL-B420P-MK72AA
Voltage Class	460 V AC
Frame Size	115 mm
Magnet Stack Length	50.8 mm
Rated Speed	5000 RPM
Feedback	Multi-turn high-resolution absolute encoder
Shaft Type	Keyless shaft extension
Brake	No brake
Connector	Right-angle SpeedTEC DIN
Connector Rotation	180° rotatable
Mounting	IEC metric
Mounting Holes	Free mounting holes, Type FF configuration
Standard Enclosure	IP50 class
Typical Application	Industrial servo motion control

The product can therefore be described in a technical catalog as a 115 mm frame, 5000 RPM, 460 V, low-inertia brushless servo motor with multi-turn absolute feedback.

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3. Detailed Technical Specifications

Parameter	Specification
Model	MPL-B420P-MK72AA
Brand	Allen-Bradley
Series	MP-Series MPL
Series Type	Low-Inertia Servo Motor
Motor Type	Brushless Permanent-Magnet AC Servo Motor
Rated Voltage	460 V AC
Voltage Class	400/460 V class
Rated Speed	5000 RPM
Rated Power	Approximately 1.9 kW
Continuous Stall Torque	Approximately 4.74 N·m
Peak Stall Torque	Approximately 13.5 N·m
Frame Size	115 mm
Frame Size in Inches	Approximately 4.53 in
Magnet Stack Length	50.8 mm
Magnet Stack Length in Inches	Approximately 2.0 in
Feedback Type	Multi-turn high-resolution absolute encoder
Feedback Configuration	Absolute multi-turn feedback
Shaft Type	Keyless shaft extension
Shaft Key	None
Shaft Seal	Standard configuration without shaft seal
Brake	No brake
Connector Type	SpeedTEC DIN
Connector Style	Right-angle
Connector Rotation	180° rotatable
Mounting Standard	IEC metric
Mounting Hole Configuration	Free mounting holes / Type FF
Standard Protection	IP50
Higher Protection Configuration	IP66 class can be achieved with appropriate sealing configuration
Approx. Overall Dimensions	132.8 × 186.5 × 98.3 mm
Approx. Dimensions in Inches	5.23 × 7.35 × 3.87 in
Approx. Weight	5.5 kg
Approx. Weight in Pounds	Approximately 12.1 lb
Operating Temperature	Approximately 0 to 40 °C
Rotor Design	Low-inertia rotor
Motor Construction	Compact brushless servo construction
Typical Control Mode	Closed-loop servo control
Typical Use	Precision positioning and high-speed motion
Brake Holding Function	Not provided
Shaft Coupling	Suitable for compatible keyless coupling systems
Installation Orientation	Suitable for industrial machine mounting when mechanical requirements are met

Important dimensional note: the dimensions above represent an approximate overall motor envelope. Actual installation dimensions can depend on the specific mechanical drawing, connector orientation, shaft arrangement and production revision. For machine design, the applicable mechanical drawing should always take precedence over a simplified overall dimension.

Important weight note: the commonly listed shipping/product weight for this configuration is approximately 5.5 kg. Weight can vary slightly depending on production revision, packaging, connector configuration and measurement method.

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4. Product Model Number Interpretation

The catalog number MPL-B420P-MK72AA can be understood as a combination of motor family and configuration identifiers.

Code Section	General Meaning
MPL	MPL low-inertia brushless servo motor family
B	460 V class configuration
4	115 mm frame-size class
20	50.8 mm magnet-stack class
P	5000 RPM configuration
M	Multi-turn high-resolution absolute feedback
K	Keyless shaft extension
7	Right-angle SpeedTEC DIN connector with rotational adjustment
2	No-brake configuration
AA	Catalog/configuration designation

This model-number structure is particularly useful when comparing related motors.

Two motors may have the same basic frame and power class while having different feedback, shaft, connector or brake configurations. Therefore, the complete catalog number should be checked when selecting a replacement motor.

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5. Product Introduction

The MPL-B420P-MK72AA is a precision-oriented servo motor developed for applications where controlled speed, positioning accuracy and dynamic response are important.

Unlike a conventional fixed-speed motor, a servo motor is intended to operate as part of a closed-loop motion system. The motor works together with a compatible servo drive and controller. The feedback device continuously provides information about motor position and movement, allowing the control system to regulate the motor according to the required motion profile.

The low-inertia construction is one of the main characteristics of this motor family. A lower rotor inertia can be particularly useful when a machine frequently changes speed.

For example, in an indexing machine, the motor may accelerate from a stopped condition, reach operating speed, decelerate quickly, stop at a precise position and then repeat the same movement hundreds or thousands of times. A low-inertia servo motor is well suited to this type of operating cycle.

The 5000 RPM rated speed also makes this motor suitable for machinery where fast mechanical movement is required.

The 1.9 kW power class, together with approximately 4.74 N·m continuous torque and approximately 13.5 N·m peak torque, provides a useful balance between motor size and dynamic output.

The multi-turn absolute encoder further improves the suitability of the motor for precision motion applications where accurate positional feedback is required.

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6. Main Product Features

6.1 Low-Inertia Servo Design

The motor is designed around a low-inertia rotor concept.

Low rotor inertia is beneficial when the machine requires rapid acceleration and deceleration. The servo drive can control changes in motor speed without having to manage as much stored rotational energy as it would with a higher-inertia motor of similar output.

This makes the motor particularly suitable for short-cycle applications.

Typical examples include indexing machines, pick-and-place equipment, packaging machinery and automated assembly systems.

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6.2 5000 RPM High-Speed Operation

The MPL-B420P-MK72AA is designed for a rated speed of approximately 5000 RPM.

High rotational speed can be useful in applications where machine productivity depends on rapid mechanical movement.

When correctly matched with the mechanical transmission, pulley, gearbox, coupling or ballscrew, a high-speed servo motor can help achieve rapid axis movement while maintaining controlled positioning.

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6.3 High Torque Capability

The motor provides approximately 4.74 N·m continuous torque and approximately 13.5 N·m peak torque.

Continuous torque is important for determining the motor’s ability to maintain a load during normal operation.

Peak torque becomes important during acceleration, deceleration and short-duration load changes.

For machine designers, these two values should be evaluated separately rather than treating the peak torque as a continuous operating rating.

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6.4 Multi-Turn Absolute Feedback

The MPL-B420P-MK72AA uses a multi-turn high-resolution absolute encoder.

Absolute feedback is useful in applications where the controller needs precise positional information.

The multi-turn characteristic is particularly relevant for applications where the motor shaft may rotate through multiple revolutions while the machine position must remain accurately represented.

This makes the motor suitable for precision positioning, coordinated axes and automated machinery that relies on accurate feedback.

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6.5 Keyless Shaft

The motor uses a keyless shaft extension.

A keyless shaft can be useful with compatible clamping couplings and mechanical transmission systems.

This configuration can provide machine builders with additional flexibility when designing the connection between the motor shaft and the driven mechanism.

The coupling must be selected according to the actual torque, speed, shaft diameter, axial load, radial load and operating conditions.

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6.6 Right-Angle Rotatable Connector

The motor uses a right-angle SpeedTEC DIN connector.

The connector can be rotated through approximately 180 degrees, providing greater flexibility during machine installation.

This is particularly useful where the motor is mounted in a compact machine enclosure and cable routing space is restricted.

The connector arrangement can also help reduce excessive cable bending when the motor is installed close to other machine components.

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6.7 No-Brake Configuration

The MPL-B420P-MK72AA is a no-brake motor.

This means the motor does not provide an integral holding brake for maintaining the load at standstill.

For horizontal axes, this may be completely suitable depending on the mechanical system.

For vertical axes or applications where a load could move when power is removed, the machine designer should evaluate whether a separate mechanical holding mechanism or a brake-equipped motor configuration is required.

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6.8 Compact 115 mm Frame

The motor uses a 115 mm frame size with a 50.8 mm magnet stack.

The relatively compact form factor makes it practical for industrial equipment where machine space is limited.

The motor can be installed into a machine structure using its IEC metric mounting arrangement.

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7. Product Advantages

7.1 Fast Dynamic Response

The low-inertia rotor design makes the motor suitable for rapid speed changes.

This is useful in machines that operate with repeated acceleration, deceleration and positioning cycles.

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7.2 High-Speed Production Capability

With a rated speed of approximately 5000 RPM, the motor can support high-speed mechanical movement when the complete drive system and mechanical transmission are appropriately selected.

This can be valuable in high-throughput production equipment.

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7.3 Accurate Motion Feedback

The multi-turn high-resolution absolute encoder provides detailed positional information.

This is useful for applications that require repeatable positioning and coordinated motion between several axes.

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7.4 Compact Motor Construction

The motor provides approximately 1.9 kW of rated output within a relatively compact frame.

This can help machine designers maintain a smaller equipment footprint.

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7.5 Flexible Cable Orientation

The rotatable right-angle connector provides additional installation flexibility.

It can be especially helpful in machines with limited rear clearance or restricted cable-routing space.

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7.6 Suitable for Repetitive Motion

The combination of low inertia, high speed and servo feedback makes the motor well suited to repetitive motion.

Typical operating patterns include:

Accelerate → Move → Decelerate → Stop → Reposition → Repeat.

This type of operating cycle is common in packaging, indexing, assembly and material-handling equipment.

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8. Typical Applications

8.1 Packaging Machinery

The MPL-B420P-MK72AA can be used in packaging equipment requiring accurate and repeatable movement.

Typical applications include:

• Packaging indexing systems
• Film feeding mechanisms
• Bagging machines
• Carton forming systems
• Product positioning systems
• Labeling mechanisms
• Cutting mechanisms
• Rotary indexing equipment
• Packaging conveyors
• Sealing mechanisms

The motor’s high speed and low-inertia characteristics are useful when packaging equipment must maintain short cycle times.

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8.2 Pick-and-Place Equipment

Pick-and-place machines require fast acceleration and deceleration.

The motor can be used for rotary or linear axes where the required load torque and speed fall within the motor system’s operating limits.

Typical applications include:

• Component transfer
• Product sorting
• Automated loading
• Automated unloading
• Component positioning
• Assembly stations
• High-speed handling equipment

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8.3 Material Handling Systems

The motor can be used in automated material-handling equipment.

Potential applications include:

• Conveyor positioning
• Transfer units
• Sorting mechanisms
• Automated lifting mechanisms
• Rotary transfer systems
• Indexing conveyors
• Product alignment systems

The exact motor size should be selected based on the actual load, acceleration profile and reflected inertia.

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8.4 Automated Assembly Equipment

Automated assembly machinery often requires precise positioning.

The MPL-B420P-MK72AA can be considered for:

• Assembly axes
• Rotary indexing stations
• Component insertion
• Fast positioning mechanisms
• Automated screw-driving axes
• Inspection stages
• Part orientation mechanisms

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8.5 Printing and Converting Machinery

Printing and converting machines frequently require synchronized motion between multiple motor axes.

Potential applications include:

• Web feeding
• Roller control
• Slitting
• Cutting
• Registration control
• Material positioning
• Tension-related motion systems

The suitability of the motor depends on the actual load and control requirements of the individual axis.

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8.6 Machine Tools

The motor can also be considered for machine-tool motion systems.

Possible applications include:

• Feed axes
• Positioning axes
• Automatic adjustment systems
• Auxiliary motion systems
• Rotary positioning systems
• Automated tool-handling mechanisms

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8.7 Robotics and Automated Motion Systems

The motor can be applied to selected robotic or automated rotary axes.

It is especially relevant to applications requiring:

• High-speed rotation
• Repeated positioning
• Controlled acceleration
• Controlled deceleration
• Accurate feedback
• Coordinated movement

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9. Five Recommended Related Models from the MPL Series

The following models are useful for comparison when the objective is to remain within the same MPL low-inertia servo motor family.

Model	Series	Voltage Class	Rated Speed	Approx. Power	Continuous Torque	Peak Torque	Frame / Stack	Feedback	Shaft	Brake	Approx. Dimensions	Weight (kg)
MPL-B310P-MJ72AA	MPL Low-Inertia	460 V	5000 RPM	0.77 kW	1.58 N·m	3.61 N·m	100 mm / 25.4 mm	Absolute multi-turn	Keyed	No brake	Approx. 117 × 170 × 88 mm	2.7
MPL-B320P-MK72AA	MPL Low-Inertia	460 V	5000 RPM	1.5 kW	3.05 N·m	7.91 N·m	100 mm / 50.8 mm	Absolute multi-turn	Keyless	No brake	Approx. 117 × 196 × 88 mm	3.7
MPL-B330P-MK72AA	MPL Low-Inertia	460 V	5000 RPM	1.8 kW	4.18 N·m	11.1 N·m	100 mm / 76.2 mm	Absolute multi-turn	Keyless	No brake	Approx. 117 × 222 × 88 mm	4.6
MPL-B420P-MJ72AA	MPL Low-Inertia	460 V	5000 RPM	1.9 kW	4.74 N·m	13.5 N·m	115 mm / 50.8 mm	Absolute multi-turn	Keyed	No brake	Approx. 133 × 187 × 98 mm	4.3
MPL-B430P-MK72AA	MPL Low-Inertia	460 V	5000 RPM	2.2 kW	6.55 N·m	19.8 N·m	115 mm / 76.2 mm	Absolute multi-turn	Keyless	No brake	Approx. 133 × 212 × 98 mm	5.5

These models cover a useful range around the B420P configuration.

The B320P is a lower-output option where the machine requires less torque.

The B330P provides an intermediate torque level while maintaining the general low-inertia concept.

The B420P is positioned around the 1.9 kW class.

The B430P provides additional continuous and peak torque while retaining the 115 mm frame class.

When selecting among these models, the most important factors are not simply rated power. The actual load torque, acceleration time, maximum speed, reflected inertia, duty cycle, feedback requirement and mechanical mounting space should all be considered.

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10. Five Closely Related B420P Models

If the intention is to find a model that is physically and electrically close to the MPL-B420P-MK72AA, several other B420P configurations are worth considering.

Model	Series	Voltage	Speed	Approx. Power	Continuous Torque	Peak Torque	Frame / Stack	Feedback	Shaft	Brake	Connector	Approx. Dimensions	Weight (kg)
MPL-B420P-MJ22AA	MPL-B420P	460 V	5000 RPM	1.9 kW	4.74 N·m	13.5 N·m	115 / 50.8 mm	Multi-turn absolute	Keyed	No brake	Right-angle DIN	Approx. 133 × 187 × 98 mm	5.5
MPL-B420P-MJ72AA	MPL-B420P	460 V	5000 RPM	1.9 kW	4.74 N·m	13.5 N·m	115 / 50.8 mm	Multi-turn absolute	Keyed	No brake	Right-angle DIN	Approx. 133 × 187 × 98 mm	5.5
MPL-B420P-MK22AA	MPL-B420P	460 V	5000 RPM	1.9 kW	4.74 N·m	13.5 N·m	115 / 50.8 mm	Multi-turn absolute	Keyless	No brake	Right-angle DIN	Approx. 133 × 187 × 98 mm	5.5
MPL-B420P-MK24AA	MPL-B420P	460 V	5000 RPM	1.9 kW	4.74 N·m	13.5 N·m	115 / 50.8 mm	Multi-turn absolute	Keyless	Configuration dependent	Right-angle DIN	Approx. 133 × 187 × 98 mm	5.5
MPL-B420P-HK72AA	MPL-B420P	460 V	5000 RPM	1.9 kW	4.74 N·m	13.5 N·m	115 / 50.8 mm	Encoder configuration	Keyless	No brake	Right-angle DIN	Approx. 133 × 187 × 98 mm	5.5

The B420P models above are closely related mechanically and in basic motor output, but the suffix can represent differences in feedback, shaft and connection configuration.

For replacement purposes, MPL-B420P-MK72AA should not automatically be replaced by another B420P model simply because the rated speed and torque are similar.

The servo drive, feedback interface, connector, shaft type and machine control architecture should be checked before selecting an alternative.

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11. Five Popular Related Models from the Same Brand Portfolio

For applications where the designer is not restricted to the MPL-B420P configuration, the following models can be considered as broader alternatives within the same servo and motion-control product portfolio.

Model	Product Family	Voltage Class	Rated Speed	Approx. Power	Continuous Torque	Peak Torque	Frame / Stack	Feedback	Brake	Approx. Dimensions	Weight (kg)
MPL-B310P-MJ72AA	MP-Series MPL	460 V	5000 RPM	0.77 kW	1.58 N·m	3.61 N·m	100 / 25.4 mm	Absolute multi-turn	No brake	Approx. 117 × 170 × 88 mm	2.7
MPL-B320P-MK72AA	MP-Series MPL	460 V	5000 RPM	1.5 kW	3.05 N·m	7.91 N·m	100 / 50.8 mm	Absolute multi-turn	No brake	Approx. 117 × 196 × 88 mm	3.7
MPL-B330P-MK72AA	MP-Series MPL	460 V	5000 RPM	1.8 kW	4.18 N·m	11.1 N·m	100 / 76.2 mm	Absolute multi-turn	No brake	Approx. 117 × 222 × 88 mm	4.6
MPL-B430P-MK72AA	MP-Series MPL	460 V	5000 RPM	2.2 kW	6.55 N·m	19.8 N·m	115 / 76.2 mm	Absolute multi-turn	No brake	Approx. 133 × 212 × 98 mm	5.5
MPL-B540K	MP-Series MPL	High-voltage class	4000 RPM class	Approx. 3.5 kW	Approx. 19.4 N·m	Approx. 48.6 N·m	Larger frame configuration	Feedback dependent	Configuration dependent	Larger MPL envelope	Approx. 15 kg

The first four models are particularly useful when the required motor output is close to the B420P range.

The larger B540K configuration is more appropriate for applications requiring substantially higher torque and a larger mechanical package.

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12. MPL-B420P-MK72AA Compared with Related Models

Specification	MPL-B320P-MK72AA	MPL-B330P-MK72AA	MPL-B420P-MK72AA	MPL-B430P-MK72AA
Voltage	460 V	460 V	460 V	460 V
Speed	5000 RPM	5000 RPM	5000 RPM	5000 RPM
Power	Approx. 1.5 kW	Approx. 1.8 kW	Approx. 1.9 kW	Approx. 2.2 kW
Continuous Torque	3.05 N·m	4.18 N·m	4.74 N·m	6.55 N·m
Peak Torque	7.91 N·m	11.1 N·m	13.5 N·m	19.8 N·m
Frame	100 mm	100 mm	115 mm	115 mm
Stack	50.8 mm	76.2 mm	50.8 mm	76.2 mm
Feedback	Absolute multi-turn	Absolute multi-turn	Absolute multi-turn	Absolute multi-turn
Shaft	Keyless	Keyless	Keyless	Keyless
Brake	No brake	No brake	No brake	No brake
Approx. Weight	3.7 kg	4.6 kg	5.5 kg	5.5 kg class
Typical Position	Lower output	Intermediate output	Medium/high-speed precision	Higher torque

The B420P configuration offers a useful middle position between smaller 100 mm-frame motors and higher-torque 115 mm-frame configurations.

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13. Advantages for Machine Builders

13.1 Good Balance Between Speed and Torque

One of the most useful characteristics of the MPL-B420P-MK72AA is the balance between speed and torque.

A motor with high speed but insufficient torque may not be able to accelerate the load effectively.

A motor with high torque but excessive rotor inertia may not achieve the desired dynamic response.

The B420P configuration combines a 5000 RPM operating class with approximately 4.74 N·m continuous torque and approximately 13.5 N·m peak torque.

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13.2 Suitable for Short-Cycle Machines

The low-inertia design makes the motor particularly suitable for machines with frequent movement cycles.

For example:

Stop → Accelerate → Move → Decelerate → Position → Stop → Repeat.

This operating pattern is common in automated production equipment.

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13.3 Compact Mechanical Package

The 115 mm frame provides a relatively compact mechanical package for a motor in the approximately 1.9 kW class.

This can help reduce the overall size of automated machinery.

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13.4 High-Resolution Feedback

The absolute multi-turn encoder is suitable for applications requiring detailed position information.

This can be especially useful for coordinated motion systems involving multiple servo axes.

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13.5 Flexible Mechanical Connection

The keyless shaft allows the motor to be used with compatible clamping-style couplings and other suitable mechanical transmission components.

This provides flexibility in machine construction.

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14. Typical Industries

Industry	Typical Application
Packaging	Indexing, film feeding, cutting, positioning
Food Processing Machinery	Conveyor positioning, filling and packaging motion
Material Handling	Transfer, sorting and positioning
Electronics Manufacturing	Component handling and precision assembly
Semiconductor Equipment	Precision stages and automated movement
Printing	Roller control and web movement
Converting	Slitting, cutting and material positioning
Machine Tools	Feed and positioning axes
Robotics	Rotary axes and automated positioning
Automated Assembly	Component insertion and indexing
Inspection Systems	Precision positioning and scanning
General Factory Automation	Servo-controlled motion axes

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15. Selection Considerations

Before selecting the MPL-B420P-MK72AA for a machine, several engineering parameters should be evaluated.

Selection Factor	What Should Be Checked
Motor Voltage	Confirm compatibility with the servo drive
Rated Power	Approximately 1.9 kW class
Continuous Torque	Confirm against continuous load torque
Peak Torque	Confirm against acceleration and transient loads
Speed	Confirm maximum required operating speed
Load Inertia	Calculate reflected inertia at the motor shaft
Acceleration	Check required acceleration and deceleration time
Duty Cycle	Determine continuous and intermittent operating conditions
Feedback	Confirm compatibility with the selected drive/controller
Shaft	Verify keyless coupling compatibility
Brake	This model does not include an integral brake
Mounting	Confirm 115 mm frame and mounting-hole arrangement
Connector	Confirm motor cable and connector compatibility
Environment	Verify enclosure and environmental requirements
Temperature	Check ambient and motor operating temperature
Cable Routing	Separate feedback wiring from high-power wiring where necessary
Vertical Axis	Evaluate whether an independent holding mechanism is required
Mechanical Load	Check radial and axial shaft loads
Installation Space	Check the complete motor and connector envelope

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16. Product Application Description for Catalog Use

The MPL-B420P-MK72AA is a high-performance low-inertia brushless servo motor intended for precision industrial motion applications. With a 460 V AC class, 5000 RPM rated speed, 115 mm frame and approximately 1.9 kW output, it provides a combination of high-speed operation, responsive acceleration and controlled positioning.

The motor incorporates a multi-turn high-resolution absolute encoder for accurate motion feedback. Its keyless shaft design and rotatable right-angle connector provide additional flexibility when integrating the motor into compact automated equipment.

It is suitable for packaging machinery, material-handling equipment, automated assembly systems, indexing machines, machine tools, printing and converting equipment, robotics and other industrial applications requiring repeatable servo-controlled movement.

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17. Product Advantage Description for Marketing Use

The MPL-B420P-MK72AA combines high-speed servo performance with a compact low-inertia design.

Its 5000 RPM operating capability supports rapid machine movement, while the approximately 4.74 N·m continuous torque and 13.5 N·m peak torque provide the torque capacity required for demanding acceleration and positioning cycles.

The multi-turn absolute feedback system provides detailed motor-position information for closed-loop motion control, while the keyless shaft and rotatable right-angle connector simplify mechanical and electrical integration.

The result is a servo motor well suited to modern automated machinery where speed, repeatability, compact dimensions and controlled motion are important design requirements.

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18. Short Technical Product Description

MPL-B420P-MK72AA is a 460 V AC, 5000 RPM, 1.9 kW low-inertia brushless servo motor with a 115 mm frame and 50.8 mm magnet stack. It features multi-turn high-resolution absolute feedback, a keyless shaft extension, a right-angle rotatable SpeedTEC DIN connector and no integral brake. The motor provides approximately 4.74 N·m continuous torque and 13.5 N·m peak torque, making it suitable for high-speed positioning, indexing, packaging, automated assembly, material handling and other precision motion-control applications.

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19. Extended Technical Product Description

The MPL-B420P-MK72AA is designed for industrial motion systems that require high-speed operation, precise feedback and rapid dynamic response. Its low-inertia rotor construction helps support frequent acceleration and deceleration, while the 5000 RPM rated speed provides the operating range required by many high-throughput automated machines.

The 115 mm frame and 50.8 mm magnet stack provide a compact motor package while maintaining a useful torque capability. The approximately 1.9 kW rated output, 4.74 N·m continuous torque and 13.5 N·m peak torque make the motor suitable for a broad range of machine axes.

The integrated multi-turn high-resolution absolute encoder provides feedback information for closed-loop servo operation. The keyless shaft configuration allows connection to suitable clamping-type mechanical transmission systems, while the 180-degree rotatable right-angle connector provides flexibility when routing motor cables in space-constrained machine structures.

This combination of high speed, low inertia, absolute feedback and compact construction makes the MPL-B420P-MK72AA a practical choice for industrial automation systems requiring controlled and repeatable motion.

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20. Final Specification Summary

Category	MPL-B420P-MK72AA
Model	MPL-B420P-MK72AA
Brand	Allen-Bradley
Series	MP-Series MPL
Series Type	Low-Inertia Brushless Servo Motor
Motor Type	Rotary AC Servo Motor
Voltage	460 V AC
Rated Speed	5000 RPM
Rated Power	Approx. 1.9 kW
Continuous Torque	Approx. 4.74 N·m
Peak Torque	Approx. 13.5 N·m
Frame Size	115 mm
Magnet Stack	50.8 mm
Feedback	Multi-turn high-resolution absolute encoder
Shaft	Keyless
Brake	No brake
Connector	Right-angle SpeedTEC DIN
Connector Rotation	180°
Mounting	IEC metric
Protection	IP50 standard
Approx. Dimensions	132.8 × 186.5 × 98.3 mm
Approx. Weight	5.5 kg
Typical Application	Industrial automation and precision motion control
Typical Equipment	Packaging, indexing, robotics, assembly, material handling, machine tools and converting machinery
Main Performance Characteristics	High speed, low inertia, precise feedback, compact construction and high dynamic response

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21. Overall Product Positioning

The MPL-B420P-MK72AA is best understood as a high-speed, medium-power, low-inertia industrial servo motor rather than simply a conventional electric motor.

Its main characteristics are the combination of:

460 V class + 5000 RPM + approximately 1.9 kW + 4.74 N·m continuous torque + 13.5 N·m peak torque + 115 mm frame + 50.8 mm stack + multi-turn absolute feedback + keyless shaft + no brake.

This combination makes the motor particularly relevant to automated machinery where fast and repeatable movement is more important than simple constant-speed operation.

For applications involving frequent indexing, high-speed positioning, synchronized axes or repeated acceleration and deceleration, the low-inertia servo architecture provides an appropriate technical foundation.

For replacement applications, however, the complete model number should always be matched carefully. A similar-looking MPL model can have a different feedback configuration, shaft configuration, connector arrangement or brake option, and these differences can affect drive compatibility and mechanical installation.

In practical machine design, the final selection should therefore consider the motor torque, peak torque, speed, inertia, feedback, shaft arrangement, drive compatibility, duty cycle, environmental conditions, installation dimensions and load characteristics together, rather than selecting the motor based on rated power alone.