8MSA5M.R0-B6 B & R Automation
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The B & R Automation 8MSA5M.R0-B6 is a self-cooling three phase synchronous motor from the 8MS series with a rated nominal speed of 3000 rpm. It features a motor size of 5, a medium relative rated torque, and a resolver encoder technology for precision feedback. The motor is equipped with a holding brake providing 15 Nm of torque and has a smooth shaft end.
Internal Product Review
The 8MSA5M.R0-B6 is a B & R Automation 8MS three phase synchronous motor with a self-cooling design. Resolver feedback with ±1 angular minute non-linearity gives the motor a precise and stable response in servo applications. An integrated holding brake rated at 15 Nm adds strong positioning security, making the motor a well-rounded choice.
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Product Description:
The 8MSA5M.R0-B6 synchronous motor is produced by B & R Automation and belongs to the 8MS Three-Phase Synchronous Motors series. It is a three-phase drive element intended for precise motion sequences in assembly lines, packaging machines, and pick-and-place axes. By combining an internal permanent-magnet rotor with electrical commutation from a servo inverter, the motor supplies continuous torque and provides closed-loop feedback through its integrated resolver. Frame size 5 and length code M provide moderate dimensions that simplify mounting in confined machine spaces. The compact format also allows the motor to fit near driven components without requiring an unnecessarily long mechanical transmission.
Thermal management relies on self-cooling, so no external fan or liquid circuit is required, and the housing surface dissipates operational heat. The stator is wound for a nominal speed of 3000 rpm, enabling direct coupling to gearless transmission stages where constant velocity is critical. A spring-applied holding brake supplies 15 Nm of static torque to secure vertical or indexing loads whenever bus power is removed. Rotor position is measured by a brushless resolver, providing the servo inverter with continuous angular feedback for commutation and motion control. All power, brake, and feedback conductors exit toward the B-side of the frame, simplifying cable routing in machines where motors are mounted close together.
The mechanical output uses a smooth shaft end, allowing backlash-free clamping hubs or couplings to be installed without keyways. For drive sizing, the motor is categorized as having medium relative rated torque, placing it between low-inertia actuators and high-torque, gear-ready units within the same series. Position feedback accuracy benefits from the matching BRX resolver type, which supports precise angular measurement during controlled movement. Its nonlinearity is limited to ±1 angular minute, supporting fine interpolation within high-resolution drives. Because an oil seal is not installed, the bearing area should be protected from coolant splashes and dust when the motor is mounted on an open machine. Suitable guarding around the shaft interface can reduce direct exposure without interfering with the selected coupling or normal motor operation.
