8MSA4X.E1-31 B & R Automation
Wake Industrial LLC is not an authorized distributor of this product.
The 8MSA4X.E1-31 is a synchronous motor from the 8MS Three Phase Synchronous Motors series by B & R Automation, featuring a nominal rated speed of 3000 rpm and extra large relative rated torque. It uses a self-cooling system, has a keyed shaft end, and is equipped with a multi-turn EnDat encoder with 512 lines and ±60 second precision.
Internal Product Review
The 8MSA4X.E1-31 is a B & R Automation three-phase synchronous motor with self-cooling and a keyed shaft for dependable machine integration. An EnDat encoder with 512-line resolution supports accurate feedback and consistent motion control. A 3000 rpm nominal speed and extra-large relative rated torque make the motor an excellent choice for dynamic servo applications.
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Product Description:
The 8MSA4X.E1-31 is a three-phase synchronous servo motor produced by B & R Automation within the 8MS Three Phase Synchronous Motors series. As a compact rotary actuator, it converts drive current from a matched servo inverter into controlled mechanical torque, allowing precise positioning and velocity control on automated axes, pick-and-place heads, and packaging machinery. Its self-cooling housing eliminates the need for external fans, reducing the number of components required around the motor. Power and feedback conductors are routed on the A-side to simplify cable routing between the motor and the control cabinet.
During continuous operation, the motor reaches a rated speed of 3000 rpm, providing a baseline mechanical frequency for gear-ratio selection. Position data come from an optical encoder that produces 512 lines per revolution; with quadrature decoding, the drive receives 2,048 discrete increments for accurate closed-loop control. Signal integrity is maintained at a bandwidth of ≥ 100 kHz at -3 dB, allowing the feedback channel to support rapid changes in speed and position. Mechanical alignment errors are reduced by the encoder’s angular precision of ±60 arcseconds, which helps limit cumulative positioning drift in multi-axis assemblies. Communication and parameter storage use the EnDat serial interface, allowing the drive to identify motor data automatically at power-up.
The feedback unit uses a multi-turn encoder that tracks shaft revolutions and retains a count of 4096 turns after power is removed, allowing the axis to restart without a homing cycle. Drive output is matched to the motor’s extra-large relative rated torque classification, supporting high acceleration of moderate-inertia loads without exceeding thermal limits. Torque is transferred through a keyed shaft, which accepts standard hub-type couplings and provides positive engagement under changing loads. The motor does not include a holding brake, so an external load-locking mechanism is required when an axis must remain stationary without drive power. No oil seal is fitted, so contaminants should be kept away from the shaft opening. The motor has frame size 4 and length code X, which identify its housing dimensions and active motor length within the 8MS series.
