8MSA4L.R0-A4 B & R Automation
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The 8MSA4L.R0-A4 is a three phase synchronous motor from B & R Automation, part of the 8MS Three Phase Synchronous Motors series. This motor features self-cooling, a holding brake with 8 Nm torque, and has a rated nominal speed of 4500 rpm. It is equipped with a BRX resolver encoder, has IP65 protection, and a smooth shaft end.
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Product Description:
The 8MSA4L.R0-A4 three-phase synchronous motor is produced by B&R Automation as part of the 8MS Three Phase Synchronous Motors series. Designed for positioning and speed control tasks in automated machinery, it converts electrical power into controlled torque for axes that require a dynamic response. The compact housing and sealed construction allow the unit to be mounted directly on machine frames without additional protective covers. Its synchronous design supports controlled acceleration, deceleration, and positioning when paired with a compatible servo drive.
The motor has a nominal speed of 4500 rpm, providing high rotational velocity for fast indexing cycles. A self-cooling system removes heat without external fans, reducing the need for auxiliary cooling equipment around the motor. The enclosure carries an IP65 rating, protecting internal components against dust and low-pressure water jets during washdown. A permanent-magnet holding brake delivers 8 Nm of static torque, securing vertical loads when power is removed. Position feedback is supplied by a BRX resolver. This sensor limits nonlinearity to ±1 angular minute and maintains a resolution envelope within ±10 angular minutes, supporting precise commutation under dynamic loads. The motor has a large relative rated torque for its frame size, making it suitable for axes that require high torque from a compact housing.
The motor has a frame designation of 4, which indicates the stator diameter category used for this housing. Its length code of L indicates an extended magnetic stack that provides the required torque capacity. Power, brake, and feedback connectors exit on the A-side, simplifying cable routing along multi-axis gantries and other automated machinery. The motor has a smooth shaft, which minimizes runout when the output is connected to precision gearheads with clamping couplings. An internal oil seal prevents lubricant from migrating toward the resolver cavity during operation. The sealed housing also allows installation in areas exposed to dust or occasional water spray without requiring a separate motor cover.
