Product Description:

The 8MSA4M.E0-GU is a three-phase synchronous motor manufactured by B&R Automation for the 8MS Three Phase Synchronous Motors series. It converts electrical power into controlled rotary motion, allowing accurate speed and position regulation on packaging lines, pick-and-place heads, and light machining axes. Integrated feedback and a drive-compatible winding design let automation controllers close position loops without supplementary sensors. This makes the motor suitable for coordinated axes that need repeatable motion and stable response during changing load conditions.

The motor removes heat through a self-cooling housing, so no external fan or liquid circuit is required. Its encoder handles carrier frequencies of ≥ 100 kHz (-3 dB), maintaining signal integrity during rapid updates. Positional error is limited to ±60", giving sub-degree accuracy for moderate-precision stages. A disk with 512 lines produces 2048 quadrupled increments per revolution, enabling smooth velocity control. Communication and electronic data are exchanged via the EnDat interface, which reduces wiring compared with analog resolvers and supports direct exchange between the motor and the connected drive. This feedback arrangement helps the control system maintain stable motion during indexing, speed changes, and short positioning moves.

The built-in feedback device is a single-turn absolute encoder, reporting the shaft angle within one mechanical revolution and simplifying startup sequences that do not require multi-turn tracking. Mechanical dimensions follow length code M, which provides a medium stator stack for applications that balance inertia with continuous torque density. Frame designation 4 identifies the outer diameter used across this size class, supporting compatibility with common machine interfaces. The electromagnetic package is tuned for a medium relative rated torque, offering sustained output in the middle of the family’s performance range. This balance suits axes that need dependable acceleration and controlled holding behavior without moving to the highest torque class in the series.