Product Description:

The 8MSA2M.R0-42 belongs to the 8MS Three Phase Synchronous Motors series manufactured by B & R Automation. It is a frameless-style synchronous motor intended for direct integration into machine axes where compact dimensions and high rotational speed are required. In automated cells, the unit supplies continuous torque to indexing tables, pick-and-place actuators, and other servo-controlled mechanisms that benefit from brushless operation and precise electronic commutation.

The motor reaches a nominal speed of 6000 rpm, allowing fast cycle times in light-to-medium-load applications. Its relative torque capability is classified as medium, so drive sizing must account for the duty cycle and thermal limits. A self-cooling housing transfers heat to the ambient air without auxiliary fans or liquid circuits. Cables exit on side A, simplifying routing when the motor is mounted against a gearbox or bearing block. The motor can withstand an axial installation force of up to 200 N during coupling installation. The unit is supplied without a holding brake and without an oil seal, reducing inertia and friction during high-speed operation. Its motor size 2 and length M establish the overall envelope and flange pattern. A smooth shaft end supports couplings that transfer torque through friction clamping rather than a keyway.

Rotor position feedback is provided by a resolver that follows B & R’s BRX format. Its nonlinearity is limited to ±1 angular minute, while its absolute precision across the electrical cycle remains within ±10 angular minutes. These tolerances support precise servo control during incremental movements. The resolver core is potted inside the stator, helping it resist the vibration and thermal drift associated with high-speed operation. The shaft geometry minimizes eccentricity at elevated rotational speeds and supports accurate resolver referencing. Electronic feedback allows the drive to monitor rotor position and regulate commutation as axis speed and load change.