Product Description:

The PMB31D-20114-01 is a brushless servo motor manufactured by Pacific Scientific within the PMB Brushless Servomotors series. This rotating actuator converts electrical energy from a matched servo drive into controlled torque and speed for positioning tasks in industrial automation cells, pick-and-place gantries, and packaging axes. Its brushless construction supports responsive motion control in applications that require repeatable starts, stops, and direction changes while reducing the maintenance associated with brush wear.

With a frame designated as NEMA Size 34, the motor mounts directly to standard 3.4-inch square flanges used on many machine plates. Under worst-case detent conditions, its nominal stall current rating is 5.4 ARMS at 240 VAC, identifying the continuous current the drive must supply without exceeding thermal limits. Feedback is obtained from a 2048 ppr incremental encoder, so each revolution is divided into measurable positions to support tight servo loops. The feedback element is a digital encoder with commutation, supplying both incremental counts and sinusoidal commutation tracks so the drive can electronically align phases without separate Hall devices. Mechanical power is transmitted through a shaft machined with a square key, preventing slip between the rotor and couplings during rapid torque reversals.

Electrical terminations leave the housing as flying leads with AMP connectors, allowing quick plug-in to cabinet harnesses while keeping the motor body compact and simplifying cable routing in tight machine spaces. For environments where fluid or dust is present, the user selected the shaft seal, which adds a contact barrier at the output end to limit ingress along the shaft journal. The electromagnetic core uses a stack length multiple of 1, which indicates the shortest lamination stack offered in this frame and helps keep inertia lower for quick acceleration.