8MSA4M.E0-44 B & R Automation
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The B & R Automation 8MSA4M.E0-44 is a three-phase synchronous motor from the 8MS Series. This motor features a self-cooling system, a nominal rated speed of 6000 rpm, and a smooth shaft end. It is equipped with a single-turn EnDat encoder with 512 lines and a holding brake that delivers 8 Nm of torque.
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Product Description:
The 8MSA4M.E0-44 is a three-phase synchronous servo motor produced by B & R Automation under the 8MS Three Phase Synchronous Motors series. Intended for precise rotary positioning in industrial automation, it connects directly to compatible drive amplifiers and converts electrical power into regulated motion for pick-and-place robots, indexing stations, and packaging equipment. Its permanent-magnet rotor and compact housing help maintain repeatable speed and torque while allowing installation in space-constrained machine frames. The integrated feedback system supplies the drive with the position data needed to regulate movement during demanding production cycles.
The nominal shaft speed reaches 6000 rpm, establishing the continuous operating limit before thermal or mechanical derating is required. The built-in encoder offers 512 lines of incremental resolution and communicates absolute position through the EnDat serial protocol, ensuring low-noise data transfer to the drive. Encoder signals support frequencies up to 100 kHz at -3 dB, while mechanical accuracy remains within ±60 arc-seconds. The motor uses self-cooling, so no external fan is required because the stator housing provides the primary path for heat dissipation. For vertical or load-holding axes, a factory-installed brake supplies 8 Nm of static torque to secure the shaft when power is removed. The motor has length code M, which provides an appropriate balance of inertia and continuous torque for medium-duty motion profiles.
Cabling exits on the A-side, simplifying harness routing when the motor is installed in a confined machine area or cabinet. Position feedback relies on a single-turn encoder, so one mechanical revolution provides a complete absolute reading and reduces the need for complex homing routines. Output torque is transferred through a smooth shaft end, allowing the use of clamp hubs or press-fit couplings without a keyway. Within the 8MS platform, this model has frame size 4 and provides medium rated torque compared with other motors in the series. An oil seal is not fitted, so external sealing is necessary when coolant, lubricant, or other fluids may reach the shaft opening.
