B&R 8MSA4S Synchronous Servo Motor

Product Brief Introduction: The B&R 8MSA4S is the short-stack variant of the Size 4 motor. It is designed for applications where axial space is extremely limited but the Size 4 flange strength is required. It offers lower torque than M/L versions but maintains high speed capabilities.
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Technical Specifications:
Frame Size: 4
Stack Length: S (Short)
Rated Torque: Approx 1.5 – 2.5 Nm range
Rotor Inertia: Very low
Max Speed: Often higher than L/M variants
Functional Features:
Ultra-compact axial length.
Extremely fast acceleration due to low inertia.
Ideal for light loads requiring fast cycling.
Application Scenarios:
Fast pick and place robots.
Gantry axes with light payloads.
Flying shear applications.
Semiconductor handling.
Performance Parameters:
Mechanical time constant: Very low.
Bandwidth: High.
Structural Characteristics:
Shortest body in Size 4 family.
Lightweight.
Working Principle:
PMSM with reduced active length. Optimized for speed rather than raw torque.
Installation Requirements:
Ensure the reduced torque is sufficient for the application’s peak demands.
Mounting same as other Size 4 motors.
Usage Notes:
Be careful not to overload thermally as thermal mass is lower than L-stack.




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