8MSA4M.E1-46 B & R Automation
Wake Industrial LLC is not an authorized distributor of this product.
The B & R Automation 8MSA4M.E1-46 is a three phase synchronous motor from the 8MS Series with a medium relative rated torque. It features a self-cooling system, motor size 4, and length M. The built-in multi-turn EnDat encoder has a resolution of 512 lines, precision of ±60 seconds, an encoder frequency limit of at least 100 kHz, and can recognize up to 4096 revolutions.
Internal Product Review
The 8MSA4M.E1-46 is a B & R Automation three-phase synchronous motor with self-cooling and medium rated torque. EnDat feedback and 512-line encoder resolution support precise motion control and clean signal quality. Recognition across 4096 revolutions is a standout feature for accurate positioning.
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Product Description:
The 8MSA4M.E1-46 synchronous motor is produced by B&R Automation and belongs to the 8MS Three-Phase Synchronous Motors series. Within an automation cell, it operates as a servo actuator that handles precise position, speed, and torque tasks on coordinated machine axes. Integrated electronic feedback provides accurate rotor-state information to the connected drive, while the permanent-magnet rotor supports responsive torque generation. These features enable tight closed-loop control during indexing, contouring, and repetitive-cycle operations in automated machinery.
Its feedback channel uses EnDat serial transmission, which sends absolute position data and diagnostic information to the controller. The built-in optical scale provides 512 lines per revolution and uses internal interpolation to deliver fine incremental resolution. Mechanical mounting accuracy is supported by an angular precision of ±60 arcseconds, keeping the position error within one arcminute. Signal integrity remains stable at an encoder frequency of at least 100 kHz at -3 dB, allowing the motor to sustain high shaft speeds without losing feedback bandwidth. For multi-turn operation, the sensor distinguishes 4096 revolutions, which eliminates the need for homing after normal power cycles. The housing uses length code M, providing a medium lamination stack for a balance between inertia and torque density.
Heat generated in the stator is removed through self-cooling by natural convection, allowing installation without an external blower or a liquid-cooling circuit. This cooling method reduces the number of auxiliary components required around the motor and avoids the maintenance associated with motor-mounted fans. The motor has a frame size of 4, which establishes flange and shaft dimensions suitable for gearheads and couplings in midrange power applications. Its electromagnetic design provides a medium relative torque level, supporting machinery that requires consistent load handling without an unnecessarily large motor. The combination of absolute feedback, compact natural cooling, and balanced rotor performance makes the motor suitable for coordinated axes where installation space is limited and repeatable motion is required.
