8MSA4M.R0-66 B & R Automation
Wake Industrial LLC is not an authorized distributor of this product.
The B & R Automation 8MSA4M.R0-66 is part of the 8MS Three Phase Synchronous Motors series and features a motor size of 4 with a medium relative rated torque. This self-cooling synchronous motor uses a BRX resolver for encoder technology, supports a nominal rated speed of 4500 rpm, and comes with a smooth shaft end.
Internal Product Review
The 8MSA4M.R0-66 is a B & R Automation three-phase synchronous motor featuring self-cooling and resolver feedback. Rated for 4500 rpm with medium relative torque, the motor offers a well-balanced performance profile for responsive motion applications. Resolver performance is particularly appealing, with ±1 angular minute non-linearity and ±10 angular minutes precision.
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Product Description:
The 8MSA4M.R0-66 is a three-phase synchronous motor manufactured by B&R Automation within the 8MS Three Phase Synchronous Motors series. It converts inverter-supplied AC power into controlled mechanical rotation for industrial motion systems. The motor is suitable for indexing tables, packaging axes, and similar applications that require closed-loop speed and position control. Its synchronous design allows the connected drive to regulate torque and rotor motion during rapid acceleration, steady operation, and controlled deceleration.
This model has a motor size of 4 and a motor length of M, which establish its physical envelope and continuous thermal capacity. Under nominal operating conditions, the rotor turns at 4500 rpm, allowing high surface speeds without external gear multiplication. Heat is removed through a self-cooling design, so no forced-air or liquid-cooling circuit is required. Power is transmitted through a smooth shaft end, which supports direct coupling to precision gearheads or timing pulleys without stress concentrations from a keyway. The windings are monitored by a resolver that provides rotor position feedback with an angular precision of ±10 minutes. The motor is supplied without a holding brake, so an external mechanism or drive-applied torque must retain stationary loads when necessary. It also lacks an oil seal, requiring suitable external protection when the shaft is exposed to oil or other contaminants.
The electromagnetic package provides medium rated torque, balancing continuous load capability with a compact mass for dynamic motion cycles. Electrical commutation and position reporting use the BRX resolver format, allowing the drive to calculate rotor position during rapid acceleration and low-speed movement. Resolver nonlinearity remains within ±1 angular minute, supporting precise servo control in pick-and-place equipment or spindle-positioning applications. The power connector has an A-side orientation, which reduces cable bend requirements when the motor is mounted close to machine plates. Power and feedback conductors leave from the same side of the housing, helping keep cable routing organized in confined installations.
