Product Description:

The 8MSA3M.R0-31 is a three-phase synchronous motor from B&R Automation and belongs to the 8MS Three Phase Synchronous Motors series. This size 3 motor with length M serves as a rotary actuator for positioning axes and conveyor sections in automated machinery. It delivers medium rated torque for repeatable motion in packaging, material handling, and general factory automation. The synchronous design supports precise speed control when used with a compatible drive. Direct shaft coupling helps reduce drivetrain play and supports accurate cyclic operation.

During operation, the motor reaches a nominal speed of 3000 rpm, so the connected drive must support that continuous operating speed. A permitted axial installation force of 200 N helps protect the bearings when couplings are fitted onto the shaft. Heat dissipation relies on a self-cooling design, so normal airflow around the housing is sufficient and no external fan or liquid circuit is required. Rotor position is reported by a resolver, allowing the drive to process sinusoidal angle feedback even in high-temperature environments. Because the model is supplied without a holding brake, stopping torque must come from the inverter or a mechanical clamp when power is removed. Connections for power and feedback are routed on the A side of the stator, which can simplify cable entry where installation space is limited. There is no oil seal, so the shaft should be protected from fluid exposure during operation.

Feedback accuracy is supported by a non-linearity rating of ±1 angular minute and a resolution accuracy of ±10 angular minutes, giving the controller predictable phase alignment during interpolation. The resolver core follows the BRX format used across B&R drives, which supports consistent pin assignments and matching feedback handling in multi-axis systems. That combination is useful on axes with repeated indexing moves. The motor is intended for medium torque applications that require repeatable acceleration without unnecessary oversizing. A keyed shaft end helps prevent slip when torque is transferred to pulleys or couplings.