Product Description:

The PMB33C-20101-02 is a brushless servomotor produced by Pacific Scientific and supplied as part of the PMB Brushless Servomotors series. In automated machinery, this motor converts commanded electrical power into regulated rotational motion that can be closely synchronized with a drive controller for positioning or velocity control in pick-and-place modules, indexing tables, and packaging axes. Its brushless design supports stable commutation and repeatable response during frequent starts, stops, and speed changes. That operating behavior is useful on axes that must follow changing commands without excessive overshoot.

This model uses a NEMA Size 34 frame, so the mounting face and pilot diameter follow the dimensional standard common to that motor class. The standardized face size helps it fit motion assemblies built around common adapter plates and coupling hardware. At a 240 V AC bus during hold conditions, the windings can draw up to 3.8 ARMS of stall current, which the drive can use when setting torque limits and overcurrent protection. Field wiring is handled through flying leads with AMP connectors, which removes the need for a separate terminal box. Rotor position feedback comes from an integrated Hall sensor that supplies digital commutation signals, and mechanical power is transferred through a shaft with a square key for positive coupling to pulleys or hubs. The keyed output reduces reliance on clamp friction when the load is subject to repeated reversals.

Thermal protection is provided by a PTC thermistor embedded in the stator, allowing the drive to reduce current as winding temperature rises toward its limit. Because the sensing element is inside the motor, temperature response follows winding heat directly during sustained loading. The electromagnetic core uses a stack length multiple of 3, which gives this configuration a higher torque constant than shorter stacks in the same frame while keeping rotor inertia suitable for rapid acceleration and deceleration. A longer magnetic stack also helps the motor produce stronger low-speed torque without changing the mounting frame size.