Product Description:

The 33VM62-020-20 is a permanent-magnet DC servo motor built by Pacific Scientific for the Low Inertia PMDC Servomotors series. Designed for light moving masses in pick-and-place arms and small positioning tables, the unit delivers quick response because of its low rotor inertia. It converts direct-current power into controlled torque so that machine axes can accelerate, decelerate, and hold speed precisely under feedback from external drives. This operating style makes it suitable for compact motion systems that need responsive starts, smooth reversals, and stable speed control during repetitive cycles.

Its electrical supply is rated at 30 VDC, and the armature can draw a continuous current of 5.4 A. A torque constant of 8 oz-in/A means each ampere produces one-half pound-inch of torque, allowing straightforward scaling of drive commands in current-controlled applications. Because the motor has no forced-air cooling, heat is dissipated through conduction and natural convection, so the mounting surface must carry away operating heat. Mechanical coupling is simplified by a shaft diameter of 0.344 to 0.406 in, which allows the use of standard couplings when the fit is selected correctly for the load and duty cycle.

A standard analog tachometer is integrated, providing a proportional voltage feedback signal for velocity loops without additional sensors. The rotor uses Alnico V-7 magnets, which help maintain stable magnetic flux at elevated temperatures and support quick acceleration in dynamic motion. Feedback is limited to speed because there is no optical encoder, so position information must come from an external device when the application requires closed-loop positioning. This arrangement keeps the feedback system simple and supports use with classic DC servo amplifiers. The motor is produced by Pacific Scientific for applications that need simple speed feedback, modest continuous torque, and minimal auxiliary cooling.