PMB31D-00101-03 Pacific Scientific
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The Pacific Scientific PMB31D-00101-03 is a brushless servomotor from the PMB Brushless Servomotors series. It has a NEMA Size 34 motor with a flat shaft design and is equipped with flying leads featuring AMP connectors. This model includes a shaft seal, PTC thermistor, and uses a hall sensor for feedback.
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Product Description:
The PMB31D-00101-03 is a brushless servomotor produced by Pacific Scientific and supplied in the PMB Brushless Servomotors series. The unit serves as a rotary actuator that delivers controlled torque and speed for positioning cylinders, small conveyors, and electronic assembly fixtures in automated lines. By combining permanent-magnet excitation with an integral electronic commutation interface, it pairs with matched servo drives to execute rapid starts, stops, and reversals without brush wear. This operating style supports repeatable motion where compact size, quick response, and stable low-speed control are important to the machine process.
The motor housing corresponds to NEMA Size 34, so its flange and pilot diameter fit compact machine layouts that use this common mounting format. The nominal stall current is 5.4 ARMS at 240 VAC, so the matching drive must support that current during locked-shaft holding conditions without overheating the motor. Power and feedback conductors exit as flying leads with AMP connectors, which simplifies harness routing and removes the need for a separate terminal enclosure on the housing. Rotor position information is provided by a Hall sensor, which supplies commutation signals that help the amplifier maintain proper phase switching through acceleration, deceleration, and direction changes. This arrangement is well suited to general servo applications that need dependable response without adding unnecessary complexity to the motor package.
The shaft has a flat, allowing clamp-style couplings to grip the output securely without relying on keys or set screws. The listed customization package includes a shaft seal and a PTC thermistor; the seal helps limit contamination near the bearing area, while the thermistor gives the drive a direct temperature-related signal for protective monitoring. A stack length multiple of 1 indicates the shortest rotor core in this design, which helps keep inertia lower for short indexing moves and frequent speed changes. That combination makes the motor suitable for axes that need responsive motion, straightforward installation, and thermal monitoring within a compact mechanical envelope.
