Product Description:

The PMB33F-20200-01 is a brushless servomotor produced by Pacific Scientific and supplied within the PMB Brushless Servomotors series. It is intended for use as the prime mover in servo axes that require accurate velocity and position regulation, such as indexing tables, automated assembly heads, and light material-handling gantries. By combining electronic commutation with permanent-magnet excitation, the motor delivers repeatable torque and provides the feedback needed by a matched drive for closed-loop industrial automation. These operating conditions support applications that require frequent starts, reversals, and controlled stopping accuracy.

The motor determines rotor angle with a resolver, an analog device whose sine and cosine windings enable continuous position tracking without electronic interpolation delays. Thermal planning is guided by its nominal stall current of 11.0 ARMS, which is the steady-state line current that can be applied at 240 V AC without exceeding winding temperature limits. Housing dimensions conform to NEMA Size 34, so the unit fits mounts built for the standardized 3.4-inch square flange. Output torque is transmitted through a square key seated in the shaft, preventing relative motion between the shaft and hub during bidirectional load cycles. Field wiring uses flying leads with MS connectors, combining routing flexibility with secure circular connections for the motor and drive interface.

To guard against coolant or dust intrusion, the motor can be specified with a shaft seal that protects the front bearing and helps extend lubricant life. The electromagnetic core uses a stack length multiple of 3, which increases the axial iron length and supports higher continuous torque without changing the outside frame size. As a PMB Series Brushless Servomotor, the unit suits applications that call for sealed construction and higher torque density in coordinated multi-axis machinery. Because the outside frame remains unchanged, the added active length can improve output capability while preserving the original mounting footprint.