8MSA3M.R0-42 B & R Automation
Wake Industrial LLC is not an authorized distributor of this product.
The B & R Automation 8MSA3M.R0-42 is part of the 8MS Three Phase Synchronous Motors series and features a self-cooling system with a smooth shaft end type. This motor has a nominal rated speed of 6000 rpm, a relative rated torque categorized as medium, and uses BRX resolver encoder technology. The connection direction is on the A side and the permitted axial force during installation is 200 Newtons.
Internal Product Review
The 8MSA3M.R0-42 is a well-executed B & R Automation three-phase synchronous motor with self-cooling and a 6000 rpm rated speed. Resolver feedback with ±1 angular minute non-linearity supports precise motion performance. A strong choice for servo applications requiring accurate high-speed operation.
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Product Description:
The 8MSA3M.R0-42 belongs to the 8MS Three-Phase Synchronous Motors series developed by B & R Automation. As a three-phase permanent-magnet motor, it supplies rotational power to servo axes and indexing stations where a compact form factor and continuous-duty performance are required. Its rated operating point and feedback configuration make it suitable for coordinated motion tasks handled by compatible drive controllers in packaging and material-handling equipment.
This model reaches a nominal speed of 6000 rpm, allowing high surface velocities on small-diameter tooling. Its relative output provides medium torque, offering a balanced profile between acceleration and continuous load capacity for applications in which components are sized by torque density. Thermal regulation relies on a self-cooling frame, so no external blower or liquid circuit is needed. Power and feedback leads exit on the A side, simplifying cable routing when the motor is installed against a gearbox or bearing block. During mounting, the shaft may be subjected to an axial force of up to 200 N without jeopardizing bearing life. Frame designation 3 and length code M indicate the stator stack depth and overall housing dimensions, providing the necessary iron volume while keeping mass moderate.
Rotor position is measured with a resolver that follows the BRX pattern. Its nonlinearity remains within ±1 angular minute, and its overall precision remains within ±10 angular minutes, enabling tight closed-loop control at high speed. The motor is supplied without a holding brake, which reduces inertia in dynamic applications where an external mechanism or drive torque can secure the load at standstill. It also has no oil seal, reducing shaft friction when additional sealing is unnecessary. A smooth shaft transmits torque through compression couplings or clamp hubs, minimizing backlash in belt-driven or direct-drive stages. The shaft interface is suited to couplings that rely on uniform clamping pressure rather than a keyed connection.
