Product Description:

The 2VM61-000-3 is a low-inertia permanent-magnet DC servomotor produced by Pacific Scientific and assigned to the Low Inertia PMDC Servomotors series. In automated assembly stations, pick-and-place axes, or compact conveyors, this motor converts regulated DC power into precise rotary motion. When paired with a suitable drive and feedback device, it provides accurate position control for compact motion applications.

At a rated supply of 36 V, the motor produces a shaft speed of 4500 RPM while maintaining a continuous output torque of 0.127 Nm. This corresponds to a mechanical output of 60 W. The armature draws 3.1 A rms under these conditions and responds linearly because of its torque constant of 0.047 Nm/A. For brief bursts of acceleration, the winding can tolerate 15 A of pulse current and 0.134 Nm of continuous stall torque without overheating. Thermal energy created in those conditions is managed because the laminations can dissipate 54 W continuously. With no external load, speed rises to 6920 RPM, which supports dynamic positioning. A terminal resistance of 3.0 Ω governs inrush current at start-up and works with the 500 µH armature inductance to filter electrical noise.

The response profile of the motor also includes an electrical time constant of 0.17 ms, indicating how quickly armature current settles after a command change, and a mechanical time constant of 4.9 ms, which describes the rotor rise to 63% of final speed when a step voltage is applied. In combination, these short delays allow tight velocity loops in small pick-and-place heads. When the motor turns, the magnets generate a back electromotive force of 4.95 V/kRPM, and drive electronics must overcome this voltage to maintain acceleration and implement dynamic braking. The moving mass is limited to 3.6 × 10⁻⁶ kg·m², so inertia contributes little to system overshoot and permits high update rates without excessive control effort.