8MSA3M.R0-K4 B & R Automation
Wake Industrial LLC is not an authorized distributor of this product.
The B & R Automation 8MSA3M.R0-K4 is part of the 8MS Three Phase Synchronous Motors series and features a rated power of 0.63 kW with a rated speed of 6000 rpm. The motor has a self-cooling system, a peak torque of 5.2 Nm, and uses resolver encoder technology.
Internal Product Review
The 8MSA3M.R0-K4 is a B & R Automation three-phase synchronous motor with self-cooling and resolver feedback. Rated output of 0.63 kW at 6000 rpm supports fast, stable servo operation in demanding motion applications. Excellent dynamic capability comes from 5.2 Nm peak torque, making the unit a strong choice for responsive positioning duty.
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Product Description:
The 8MSA3M.R0-K4 synchronous motor is manufactured by B&R Automation within the 8MS Three Phase Synchronous Motors series. As a three-phase motor with a permanent-magnet rotor, it serves as the mechanical power element in compact pick-and-place modules, indexing tables, and other motion axes that need precise torque at high speed. Integration with ACOPOS drives is straightforward because the resolver feedback and self-cooling design support direct installation without external fans or separate encoders. This layout suits compact servo axes where fast moves and repeatable positioning are required in a limited footprint.
At its continuous operating point, the motor delivers 0.63 kW of mechanical output while running at 6000 rpm and drawing 1.4 A from the drive. The electromagnetic design includes a 0.78 Nm/A torque constant and a 12.7 Ω stator resistance, which affect voltage drop and copper loss under steady load. A stator inductance of 21.5 mH and a voltage constant of 47 V/1000 rpm influence current ripple, and the resolver feedback provides rotor position data with ±1 angular minute nonlinearity and ±10 angular minutes precision. Motor size 3 with length code M gives a rotor inertia of 0.65 kg·cm², and self-cooling keeps the housing within limits during rated operation. The installation can accept up to 200 N of axial force without bearing damage.
Dynamic operation is supported by 5.2 Nm of peak torque that can be produced for short bursts while the inverter supplies up to 7.2 A. The winding time constant of 1.69 ms allows current to rise quickly, which helps the motor accelerate rapidly despite its moderate rated torque. Short overload capability is useful during indexing, reversal, and brief acceleration events that demand more torque than the continuous rating. Transient heating is moderated by a 30 min thermal time constant, so intermittent overloads remain within insulation limits. When the shaft is locked, the motor draws 1.67 A to hold 1.3 Nm of stall torque, and these values match the resolver-based control arrangement used with the motor.
