Product Description:

The PMB33E-20101-00 is a brushless servomotor in the PMB Brushless Servomotors series from Pacific Scientific. Within an automation cell, this unit transforms three-phase electrical power into precisely controlled rotary motion commanded by a matching digital drive. Its purpose is to supply repeatable torque to mechanisms such as indexing tables, labeling spindles, small material-handling axes, and other medium-inertia loads common on packaging and electronic assembly lines. This operating role allows the motor to support frequent starts, stops, and direction changes while maintaining stable motion at the shaft. That behavior is useful on axes that must track short motion profiles without excessive overshoot or hesitation during repeated production cycles.

The motor uses a NEMA size 34 frame, giving a 3.4-inch square mounting face that fits common servo flanges and adapters. At a 240 VAC bus, it draws a nominal stall current of 7.4 ARMS, so any compatible amplifier must provide that continuous phase current to maintain locked-rotor torque without overheating. Rotor position feedback is obtained from a Hall sensor, enabling six-step commutation or serving as the coarse channel in a dual-encoder arrangement. Power, sensor, and ground conductors exit as flying leads with AMP connectors; this potted lead-exit style eliminates a removable connector shell, improves sealing, and lets the cable be routed cleanly inside the control cabinet.

Mechanical power is transmitted through a square key machined into the 0.500-inch shaft, which helps prevent slip between the motor and couplings during rapid reversals. The laminated stator stack uses a length multiple of 3, increasing active magnetic material and raising continuous torque while keeping the standardized mounting face unchanged. The keyed shaft layout also supports positive torque transfer when the load experiences abrupt acceleration or deceleration. It is sold as a Standard Motor, so electrical constants, lead colors, and mounting threads remain fixed across production lots. The unit is classified as a PMB Series Brushless Servomotor, which keeps the phase sequence and sensor orientation consistent with drives intended for this family.