Product Description:

The PMB31D-10101-02 is a brushless servomotor produced by Pacific Scientific for the PMB Brushless Servomotors series. The unit is intended for closed-loop drive systems where compact rotary power with rapid acceleration is required, such as pick-and-place gantries or indexing tables in industrial automation. In these applications, the motor must respond quickly to frequent speed changes while maintaining consistent torque output through short duty cycles. It combines a permanent-magnet rotor with electronic commutation, helping the motor deliver smooth torque and accurate speed response during repeated start-stop motion.

The mechanical envelope follows the NEMA Size 34 frame standard, so the face-mount holes and pilot diameter align with common servo gearboxes and actuators. This frame format helps the motor fit standard mounting hardware without adapter plates in many servo assemblies. A nominal stall current of 5.4 ARMS at 240 VAC indicates the continuous phase current the drive must supply to hold maximum rated torque while the shaft is stationary. Connection to the drive is through flying leads with AMP connectors, which supports flexible cable routing while keeping termination straightforward. Rotor position feedback is provided by a Hall sensor, enabling six-step commutation and maintaining phase synchronization during startup and low-speed operation.

Thermal protection is supplied by a built-in PTC thermistor that sharply increases resistance if winding temperature rises, allowing the amplifier to react before insulation is overstressed. This protection method gives the controller a direct indication of abnormal heat buildup during prolonged low-speed or stalled operation. The output uses a round shaft, which avoids keyway stress points and suits clamp-style couplings in high-speed applications. A stack length multiple of 1 means this model uses a single magnetic lamination section, giving it the shortest axial length within the family and making it easier to fit where motor depth is limited.