Product Description:

The PMB31D-00200-02 is a brushless servomotor built by Pacific Scientific for the PMB Brushless Servomotors series. This frameless rotor-stator assembly is intended for closed-loop motion axes where compact size and rapid torque response are essential, such as pick-and-place units, indexing tables, or electronic assembly equipment. By combining permanent-magnet excitation with electronic commutation, the motor supplies continuous torque without the brush wear that can limit duty cycles in traditional DC designs.

The mechanical envelope corresponds to NEMA Size 34, allowing direct interchange with actuators that follow this flange standard. Electrical loading at stall reaches 5.4 ARMS when powered from 240 VAC drives, which affects conductor sizing and thermal planning for the installation. Position feedback is delivered by a resolver, and its analog sine-cosine signals support high-speed conversion to absolute angle while tolerating temperature variation and electrical noise. Power and feedback exit the stator through flying leads with MS connectors, so final termination can be made at a panel junction rather than on the motor body. A built-in PTC thermistor is embedded in the windings, and its temperature-dependent resistance can be monitored by the drive to initiate current foldback before insulation limits are reached.

For machines that couple directly to gearheads or lead screws, the output uses a flat shaft to help prevent slip between the motor and mounted hardware without relying on keyways. Axial length is minimized by a stack length multiple of 1, which gives the unit a short package while preserving useful torque density. Matching cables are available through Pacific Scientific, which helps maintain shielding and pinout consistency with the resolver and thermal sensor lines. The motor remains part of the PMB Brushless Servomotors family, which helps keep fit and connection style consistent when the same machine uses multiple axes.