Product Description:

The PMB31B-10200-01 is a brushless servomotor built by Pacific Scientific for the PMB Brushless Servomotors series. As a permanently excited AC motor, it is intended for closed-loop axis control in automated machinery where consistent torque and accurate position feedback are required. This type of motor is commonly used on positioning axes that need stable response during repeated starts, stops, and speed changes. Its feedback-equipped design supports servo systems that must maintain controlled motion under changing load conditions.

The motor body follows the NEMA Size 34 frame, so its mounting holes and pilot diameter match other size-34 motion devices used on conveyors, index tables, and small gantries. This frame size supports compact installation while keeping standard face dimensions for compatible mounts. Power is delivered through flying leads with MS connectors, which makes cable routing easier in tight enclosures before the circular connectors are attached. The lead arrangement avoids a fixed terminal housing at the motor body and leaves more freedom for cable exit in confined spaces. Under a 240 VAC bus, the winding draws a nominal stall current of 2.7 ARMS, which helps match the motor to a drive with the proper continuous current capacity. Output torque is transferred by a round shaft, which simplifies coupling to precision gearboxes or flexible couplers.

An integral resolver is mounted on the rear endbell to supply analog sine-cosine feedback for rotor angle calculation during startup and dynamic speed loops. To protect the front bearings from coolant spray or airborne particulates, the unit is offered with a shaft seal. This feature is useful in equipment exposed to moisture, mist, or fine debris. The laminated core uses a stack length multiple of 1, which keeps the magnetic stack short and helps the motor fit into machines with restricted depth.