Product Description:

Pacific Scientific builds the 33VM62-000-17 permanent-magnet DC servomotor as part of the Low Inertia PMDC Servomotors series. The unit is intended for machine axes that demand high acceleration with limited overshoot, converting armature current from a matched drive into proportional shaft torque. By keeping rotor inertia low, the motor supports packaging, assembly, and semiconductor tools in achieving repeatable indexing cycles within tight dwell windows. Its direct-drive format allows motion controllers to command position, velocity, and torque without intermediate belts or gearboxes, reducing compliance and mechanical complexity.

The electromagnetic stack uses Alnico V-7 permanent magnets and maintains a working clearance of 0.005 in between the stator and armature. This narrow air gap improves energy conversion efficiency and keeps cogging low during slow-speed positioning. Commutation relies on carbon brushes, a material selected for stable contact resistance and minimal film formation on the commutator. Expected service life for the brush set is 5000 h under nominal load, and the assemblies are field replaceable, so they can be changed without removing the motor from the machine frame. Speed feedback is limited to the armature EMF because an analog tachometer is not attached, so an external sensor is required when tighter regulation is needed.

The rotor is a hollow rotor type, trimming mass so acceleration rates remain high when coupled to lightweight loads. Despite the reduced mass, the motor can deliver peak torque up to 5x rated for brief intervals, which suits index moves that demand short bursts of force. Thermal control relies on conduction through the frame, and there is no forced-air cooling, so ambient airflow must remain unobstructed. Position verification is external because no optical encoder is attached, allowing users to select the resolution and protocol that match their drive architecture.