Product Description:

The 33VM62-220-3 is a permanent-magnet DC servomotor manufactured by Pacific Scientific within the Low Inertia PMDC Servomotors series. Designed as a compact rotary actuator, it converts controlled direct-current input into precisely regulated shaft motion for automated machinery. The low inertia design makes the unit suitable for duties that demand quick reversals and tight following of command profiles. It mates with external drive amplifiers that regulate armature current, enabling closed-loop speed control in pick-and-place heads, light conveyor sections, and small indexing tables.

Under nominal loading, the motor draws a rated current of 13.9 A from a supply of 30 VDC to deliver a continuous shaft output of 167 W. At the rated operating point, the armature turns at 3175 rpm and produces 0.544 Nm of torque. Instantaneous overloads can be handled with a peak current of 65 A, while the rotor responds in only 1.7 ms because of its low mechanical time constant. Electrical losses are limited by a terminal resistance of 0.85 Ω measured at 25 °C. The motor uses an air inlet and outlet with baffles for ventilation, and speed feedback is supplied by a standard tachometer. At no load, the motor reaches 6925 rpm.

The electromagnetic parameters govern performance during dynamic moves. A back electromotive force constant of 4.21 V/kRPM establishes the voltage developed at speed and pairs with a torque constant of 0.040 Nm/A to relate armature current to produced torque. The laminated armature has a rotor inertia of 3.44 × 10⁻⁶ kg·m², allowing the drive train to accelerate to the application limit of 7500 rpm without excessive energy storage. When commanded for rapid indexing, the motor can generate a peak torque of 2.6 Nm for short intervals, after which thermal limits require a return to the continuous operating range.