Product Description:

The PMB31D-10114-01 brushless servomotor is produced by Pacific Scientific within the PMB Brushless Servomotors series. It is intended for precision positioning and velocity control in automated machinery where closed-loop feedback is needed for repeatable motion profiles. When coupled to a matching drive amplifier, the unit converts three-phase power into controlled torque for pick-and-place axes, indexing tables, and light machine-tool spindles. This operating role also supports smooth acceleration and stable speed regulation during repeated production cycles.

The electrical interface uses flying leads with AMP connectors, allowing quick harness assembly without a separate terminal box. Its frame conforms to NEMA Size 34, so it mounts directly to equipment that supports the common 3.4-inch square bolt pattern. Under a 240 Vac bus, the motor can draw up to 5.4 ARMS of nominal stall current, which is useful when matching the drive’s continuous output capability and cabinet heat load. Rotor position is measured by an optical encoder with 2048 ppr, and this resolution sets the smallest incremental movement the control loop can detect. The feedback device is a digital encoder with commutation, so one unit provides both position data and the commutation references needed by the drive.

A factory-installed shaft seal helps limit the ingress of dust or light splashing and protects internal bearings during washdown cycles. The output end uses a round shaft, which simplifies coupling to timing pulleys or flexible couplings without a keyed connection. Magnetic stack height follows a single-layer format with a stack length multiple of 1, which helps keep rotor inertia low for rapid acceleration. Lower inertia can improve response during short indexing moves, frequent reversals, and other applications that demand quick changes in speed.