Product Description:

The PMB33E-20101-03 brushless servo motor is manufactured by Pacific Scientific as part of the PMB Brushless Servomotors series. It is designed for closed-loop rotary motion in indexing tables, form-fill-seal stations, and small gantry axes where precise speed and position control are critical. Electronic commutation reduces maintenance and pairs the motor with 240 VAC servo drives that regulate current, velocity, and torque in automated material-handling and assembly equipment. Its brushless design also supports repeatable start-stop duty in machines that depend on consistent low-speed control and quick response to changing load commands.

Mechanical and electrical interfaces are arranged through flying leads with AMP connectors, so wiring to panel-mounted drives can be completed without additional terminal blocks. The frame follows NEMA Size 34 dimensions, giving the motor a 3.4-inch square face that aligns with standard gearboxes and mounting plates. A continuous load can be applied until the windings reach the 7.4 ARMS nominal stall current limit, which helps match the motor to a compatible drive for continuous or short-duration stall conditions. Rotor position feedback is provided by a Hall sensor, enabling six-step commutation when a resolver or encoder is not required. Output torque is increased by a stack length multiple of 3, which adds magnetic material compared with shorter versions.

Environmental protection is improved by a shaft seal that helps block dust and low-pressure fluid ingress at the output end of the motor. A PTC thermistor monitors winding temperature so the drive can reduce current if internal heat rises too high during extended operation. Power is transmitted through a shaft machined with a square key, which provides positive engagement to pulleys or couplings without relying on friction alone. The motor package combines shaft sealing, winding temperature monitoring, and keyed torque transfer in one compact assembly.