8MSA4L.E0-31 B & R Automation
Wake Industrial LLC is not an authorized distributor of this product.
The B & R Automation 8MSA4L.E0-31 is a three phase synchronous motor from the 8MS Series with a motor size of 4 and a keyed shaft end. It uses a self-cooling system, has a nominal rated speed of 3000 rpm, and features an EnDat single-turn encoder with 512 lines of resolution. The motor has its connection direction on the A side and does not have a holding brake or oil seal equipped.
Internal Product Review
The 8MSA4L.E0-31 is a B & R Automation three-phase synchronous motor with self-cooling and a keyed shaft. EnDat feedback and 512-line encoder resolution support accurate motion control and dependable integration in servo applications. A 3000 rpm rated speed gives the motor a strong performance profile for dynamic machine axes.
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Product Description:
The 8MSA4L.E0-31 is a three-phase synchronous motor produced by B & R Automation for the 8MS Three Phase Synchronous Motors series. Classified as size 4 with an L-length stator, the unit delivers continuous torque to servo axes in pick-and-place stations, packaging lines, and material-handling gantries. It converts drive inverter output into mechanical rotation while maintaining precise electrical commutation for industrial positioning tasks. This operating principle supports controlled acceleration, steady rotation, and accurate stopping in automated machinery.
At a rated speed of 3000 rpm, the rotor can sustain its nominal velocity when commanded by the drive. Heat generated in the stator is dissipated through a self-cooling housing, removing the need for external blowers and allowing compact machine layouts. The integrated encoder supports signal frequencies of ≥ 100 kHz at -3 dB, so position data remain stable during high-acceleration profiles. With a base resolution of 512 lines, the feedback device delivers 2,048 discrete counts after quadrature decoding. Its angular precision of ±60″ permits tight velocity-loop bandwidths in multi-axis assemblies. The resulting feedback allows the connected drive to monitor rotor movement throughout demanding motion cycles.
The feedback system uses the EnDat protocol for digital communication between the motor and the B & R servo amplifier. Because the encoder is a single-turn device, it reports absolute position within one revolution, which is suitable for axes that establish a reference during startup. A keyed shaft end transmits torque directly to pulleys or gearboxes, and the connection plugs are oriented on the A side to support orderly cable routing inside machines. The frame corresponds to Motor Size 4, providing relatively high rated torque for midrange payloads. The motor does not include an internal holding brake, so an external method is required if a load must remain stationary after power is removed. It also does not include an oil seal, making it suitable for cleanroom or enclosed-gearhead installations where the shaft is not exposed to oil or other contaminants.
