Product Description:

The PMB31B-00114-02 brushless servomotor is produced by Pacific Scientific and belongs to the PMB Brushless Servomotors series. As a permanent-magnet synchronous unit, it converts drive current into controlled shaft torque for positioning, velocity, or tension loops in automated machinery. Typical roles include precise pick-and-place heads, small conveyors, and light robotic joints that need consistent response. The motor is intended for compact motion systems where repeatable torque delivery and quick speed changes are required.

In mechanical terms, the motor frame conforms to NEMA size 34, so its 3.4-inch square face aligns with standard mounting plates on mid-frame axes. Continuous torque at standstill is limited by allowable phase current, and the nominal locked-rotor current is 2.7 ARMS at 240 VAC. Position feedback comes from an integral optical encoder that yields 2048 ppr, which becomes 8192 counts per revolution with quadrature decoding and allows fine position tracking. Because it uses a digital encoder with commutation, electrical angle information is carried in the same signal set, removing the need for separate Hall sensors. Thermal monitoring is handled by an embedded PTC thermistor, whose rapid resistance increase can trigger a controlled shutdown before winding temperature rises too far.

For electrical connections, the stator leads exit the housing as flying leads with AMP connectors, allowing direct mating inside a control cabinet or junction space. The output shaft has a flat, so a coupling can lock against rotational slip with a single set screw. Magnetic core height follows a stack length multiple of 1, which gives the shortest active stack in the series and helps keep rotor inertia low for fast acceleration. The lead style can simplify cable routing where preterminated cabinet harnesses are already in use.