Product Description:

The PMB31D-00214-00 is a brushless servomotor produced by Pacific Scientific as part of the PMB Brushless Servomotors series. This rotary unit converts electrical energy into controlled mechanical rotation for axis control in packaging machines, pick-and-place robots, and other industrial automation equipment that requires precise speed and torque regulation. Its permanent-magnet construction eliminates brushes, reduces mechanical wear, and supports responsive current control with compatible digital drives. This design is well suited to applications that require repeatable starts, stops, and speed changes during continuous production.

Its frame matches the NEMA Size 34 standard, which gives the motor a 3.4-inch mounting interface for many established machine layouts. That mounting size suits assemblies built around standard face dimensions and helps the motor fit compact motion stages. On a 240 V AC supply, the motor has a nominal stall current of 5.4 ARMS, so the connected drive must provide that current level to maintain rated stall performance without overheating. Position feedback is provided by a quadrature optical encoder with 2048 ppr resolution, allowing accurate motion control over a full revolution. Electrical connection is made through flying leads with MS connectors, which can simplify routing in compact installations. The output uses a shaft with a flat, allowing couplings to grip securely without a keyed shaft.

The integrated feedback device is a digital encoder with commutation, so the drive receives phase information for electronic commutation without separate Hall sensors. This arrangement combines position feedback and commutation data in one device, reducing the number of separate sensing elements on the motor. The motor is supplied as a standard motor, which indicates a fixed production configuration rather than a custom build. Pacific Scientific identifies the construction as a PMB Series Brushless Servomotor, aligning the unit with the electrical characteristics used across that motor line. A stack length multiple of 1 indicates the shortest configuration in this model range, which helps keep moving mass low on high-acceleration axes.