Product Description:

The PMB31B-10100-03 is a brushless servomotor manufactured by Pacific Scientific for the PMB Brushless Servomotors series. It converts three-phase electrical power into controlled rotary motion for positioning tables, pick-and-place heads, and other closed-loop axes in automated machinery where repeatable motion is required. When paired with a compatible drive amplifier, the motor delivers stable torque and speed so the control system can handle indexing moves, velocity regulation, and coordinated path changes with consistent response. Because it is a brushless design, commutation is handled electronically by the drive, which supports smooth operation and reduces wear associated with brush-based motor systems.

The motor uses a frame size of NEMA Size 34, which provides a 3.4-inch square mounting face for direct attachment to standard support plates or gearboxes. Continuous stall output requires 2.7 ARMS at 240 Vac, so the connected drive and supply wiring must support that load without nuisance overcurrent shutdowns. Power and feedback leave the housing through flying leads with AMP connectors, which can simplify routing where a fixed panel connector is not preferred. Rotor position is returned by a resolver, and torque is delivered through a round shaft that works well with collets or compression-style hubs. This shaft style also avoids the backlash that can be introduced by keyed connections in some motion assemblies.

Protection and thermal monitoring use a shaft seal and PTC thermistor. The shaft seal helps keep dust or coolant away from the front bearing area, while the thermistor allows the drive to react if motor temperature rises too high during heavy cycling or low-speed operation. The stack code is 1, which indicates the shortest core length and helps reduce inertia for faster acceleration and deceleration. A shorter magnetic stack can be useful on axes that make frequent starts, stops, and reversals. This layout fits compact servo applications that need quick response and straightforward mechanical integration.