Product Description:

The 8MSA4M.R0-42 is a three-phase synchronous motor produced by B&R Automation within the 8MS Three Phase Synchronous Motors series. It is intended for high-speed axes in automation cells, where it converts electrical energy into rotary motion for precise positioning in pick-and-place gantries and machine tool spindles. In servo-controlled systems, it supports repeatable speed changes and accurate position correction during rapid indexing. The motor is supplied without a holding brake or oil seal, so it is best suited to installations that already provide external load holding or sealing at the machine level.

Wiring access is located on side A, keeping power and feedback leads close to cabinet walls in compact machines. The housing uses self-cooling, so heat leaves through the motor surface without forced airflow or liquid jackets. This cooling method keeps the motor package simple and avoids the added hardware of external fans. A smooth shaft end avoids keyways and threads, which helps reduce vibration transfer to precision couplings and supports the use of clamping-style shaft connections. Under nominal conditions, the rotor reaches 6000 rpm, supporting high-throughput cycles within the intended operating range. Position feedback is provided by a resolver, allowing the connected drive to read rotor angle reliably in electrically noisy environments.

The motor uses frame size 4 with stack length M, which helps standardize mounting within this product line. Feedback accuracy is supported by nonlinearity limited to ±1 angular minute, while basic precision across one electrical cycle stays within ±10 angular minutes. These tolerances help keep closed-loop position error low during normal operation and repeated positioning moves. The motor is placed in the medium rated torque range, balancing acceleration capability with thermal load.