Product Description:

The PMB31B-10201-02 belongs to the PMB Brushless Servomotors series produced by Pacific Scientific. It is a three-phase permanent-magnet servomotor intended for closed-loop speed and position tasks in CNC tables, pick-and-place axes, and packaging conveyors. When paired with a matched drive, it converts commanded current into proportional torque so the controller can regulate acceleration, speed, and stop position without added mechanical gearing. That operating principle suits automated axes that need repeatable motion and fast response to changing load conditions.

This model uses a NEMA Size 34 frame, so its front-face and pilot dimensions match common inch-based mounting hardware and fit many machine plates that follow that standard. Power exits the housing through flying leads with MS connectors, which reduces field termination work and supports straightforward cable routing inside compact enclosures. A set of Hall sensors provides commutation feedback, and their discrete switching makes initial rotor alignment deterministic at startup so the drive can energize the phases in the correct sequence. During static loading, the windings reach their thermal limit at 2.7 ARMS on 240 VAC, which gives the drive a clear reference for current limiting and helps prevent overheating at standstill. The motor uses a round shaft with no keyway, making it well suited to clamp couplings where concentricity and low backlash are important during precise motion.

A factory-installed PTC thermistor is embedded in the stator to signal the drive when internal temperature rises beyond its threshold, allowing protective derating or shutdown before insulation damage occurs. Electromagnetic output is tied to a stack length multiple of 1, giving this motor the shortest magnetic core used in this product line and reducing inertial load during high-acceleration moves. A shorter core can help the axis respond more quickly during indexing, reversing, and other short-cycle motion patterns.