Product Description:

The PMB31B-10214-02 is a brushless servomotor built by Pacific Scientific and supplied within the PMB Brushless Servomotors series. It is intended for closed-loop motion axes that need repeatable torque, speed, and position control in industrial automation cells and packaging machines. By combining electronic commutation with an integrated feedback device, the motor provides a direct electromechanical interface between a drive amplifier and the mechanical load.

The frame follows the NEMA Size 34 outline, so mounting holes and shaft height match common stepper and servo installations of that frame class. Continuous stall operation draws up to 2.7 ARMS from a 240 VAC drive; this current represents the thermal limit at which the stator can hold rated torque without overheating. Rotor position is monitored by a high-precision incremental encoder that delivers 2048 ppr, giving the drive fine resolution for velocity and position loops. Commutation signals are sourced from a digital encoder with commutation, removing the need for separate Hall sensors and simplifying cabling. This arrangement allows one feedback device to supply both position data and commutation information to the drive. Power and feedback leave the housing through flying leads with MS connectors; the leads allow flexible routing while the circular connectors mate to standard servo drive harnesses.

For over-temperature protection, the winding pack includes a PTC Thermistor; the drive can monitor the rising resistance of this device and shut down before insulation limits are exceeded. The shaft is a round shaft, making it suitable for clamp or set-screw couplings where backlash must be minimized. The motor uses Stack Length Multiple 1, which is the shortest active stack in the PMB family and the lightest option in that group.