Product Description:

The PMB31B-20114-00 is a brushless servomotor produced by Pacific Scientific for the PMB Brushless Servomotors series. It is intended to provide closed-loop rotary motion in automated machinery where accurate speed regulation and repeatable positioning are required. Within an axis system, the motor works with a matching drive that reads the feedback device and adjusts phase current so commanded torque is delivered with stable response during starts, stops, and direction changes.

The housing matches NEMA Size 34, so it fits common mounting patterns used in compact industrial axes. Torque is transferred through a square key shaft, which provides a positive mechanical connection for pulleys or couplings during repeated indexing cycles. Position information comes from a 2048 ppr incremental encoder, and the feedback unit is a digital encoder with commutation so the drive can track shaft movement and align stator energization with rotor position. Continuous stall duty requires up to 2.7 ARMS at 240 VAC, which is useful when selecting a compatible amplifier and sizing the electrical supply for low-speed, high-torque operation.

Power and feedback connections leave the motor through flying leads with AMP connectors, which can simplify routing where rear clearance is limited. The unit belongs to the PMB series brushless servomotor range and is listed as a standard motor, indicating a regular production configuration rather than a custom build. A stack length multiple of 1 indicates the shortest lamination stack used for this frame, which helps keep rotor inertia low for lighter loads and faster response. This layout suits machinery that benefits from compact motor length, direct drive integration, and encoder-based feedback without requiring unusual mounting hardware or special motor options.