Product Description:

The PMB33E-20214-03 is a brushless servomotor manufactured by Pacific Scientific within the PMB Brushless Servomotors series. It converts electrical power from a matched drive into controlled torque and speed for positioning tables, pick-and-place heads, and other motion axes common in automated machinery. As a permanent-magnet unit, it delivers high torque in a compact envelope and drops directly into installations that follow the NEMA 34 mounting pattern.

Electrical connections exit the housing through flying leads with MS connectors, giving installers a pre-terminated harness that reduces panel wiring time. Rotor position is reported by an optical disk that provides 2048 ppr resolution, allowing the drive to command incremental moves smaller than 0.2 degrees. Because the frame is NEMA Size 34, bolt circles and pilot diameters match widely used servo and stepper footprints, easing mechanical interchange while supporting higher torque than smaller frames. During locked-rotor operation at 240 VAC the windings draw up to 7.4 ARMS, a limit that guides drive current settings and cable sizing. Commutation and incremental feedback are both delivered by a digital encoder with commutation, so phase alignment is restored automatically after every power cycle.

Mechanical power leaves the motor through a square key shaft, enabling rigid coupling without relying on press fits. For contaminated or thermally demanding sites the motor is customized with a shaft seal and PTC thermistor; the seal blocks splash ingress while the thermistor signals the drive if winding temperature rises toward unsafe levels. Continuous torque is increased by a stack length multiple of 3, which adds active laminations without altering the frame outline. As a PMB Series brushless servomotor, the unit accepts sinusoidal or trapezoidal current control and interfaces readily with Pacific Scientific digital drives.