Product Description:

B & R Automation manufactures the 8MSA7S.R0-B5 as part of its 8MS Three Phase Synchronous Motors series. This three-phase synchronous motor serves as a torque source for automated pick-and-place stations, indexing tables, and small conveyor segments that need closed-loop speed control. By integrating permanent-magnet excitation with internal resolver feedback, the unit converts three-phase power into synchronized mechanical rotation suitable for demanding cycle-time-oriented machinery in general industrial automation. The design targets applications where space is at a premium yet continuous duty is expected.

B & R labels this model with motor size 7 and compact length code S, giving a slender envelope that simplifies mounting in tight frames. Power and feedback conductors exit on side B, so cable routing remains orderly. A self-cooling aluminum housing removes loss heat without auxiliary blowers, helping the motor sustain its nominal rated speed of 3000 rpm during steady operation. The flange and shaft tolerate up to 500 N of axial force when couplings are pressed on, and a keyed shaft end transmits torque reliably while keeping inertial loading modest for lightweight actuators.

Position information is generated by a Resolver that conforms to the BRX format, allowing the drive to close the current and velocity loops with analog accuracy. Systematic error is limited to ±1 angular minute, and repeatability remains within ±10 angular minutes, ensuring that command positions are met without iterative correction routines. Because the motor is supplied without a holding brake, the axis must rely on drive torque or external clamps for power-off retention. An external shaft seal is not fitted, so the machine layout should shield the bearing face from aggressive coolant or dust.