Product Description:

The PMB33C-20214-02 belongs to the PMB Brushless Servomotors series manufactured by Pacific Scientific. It is a brushless servomotor intended for closed-loop motion axes in industrial automation, where it converts drive current into controlled rotary motion for positioning, conveying, or indexing tasks. The frame follows the NEMA Size 34 standard, so its flange, mounting pattern, and shaft height match common U.S. stepper and servo hardware. A stack length multiple of 3 places three lamination stacks inside the stator, increasing copper volume and torque capacity compared with shorter versions in the same platform. Because this frame standard is widely used, the motor can fit many machine layouts that already use this mounting footprint.

Under 240 VAC operation, the motor can sustain a nominal stall current of 3.8 ARMS, which helps determine amplifier sizing and continuous torque capability at locked rotor. Position feedback is supplied by a digital encoder that delivers 2048 ppr, supporting fine velocity updates and accurate electronic commutation during precise axis motion. Mechanical power is transmitted through a Square Key shaft, allowing positive torque transfer to pulleys or gearheads without relying on friction alone. This shaft style also helps maintain coupling security when the motor is subjected to repeated starts, stops, and reversing duty.

Cabling exits as Flying leads with MS connectors, allowing quick mating to drive harnesses while keeping motor power and feedback conductors accessible for routing. Over-temperature detection is provided by a PTC Thermistor installed in the winding pack, so the drive can remove or reduce current if winding temperature rises too far. Commutation signals come from the built-in feedback device, a Digital Encoder with commutation, so no separate Hall sensors are required. This arrangement keeps the feedback path directly tied to the motor and reduces the number of external components needed around the axis.