Product Description:

The 45VM62-020-4 is a permanent-magnet DC servomotor produced by Pacific Scientific in the Low Inertia PMDC Servomotors series. The unit offers low rotor inertia so that motion commands can be followed rapidly with minimal overshoot. That response is useful on short indexing moves where the axis must settle quickly after a command change. By converting electrical energy from a direct-current source into precisely metered mechanical torque, it serves as the drive element for compact pick-and-place axes, small conveyors, and light robotic joints that must start, stop, and reverse quickly. Its permanent magnets eliminate field windings, reducing weight and improving efficiency.

A nominal supply of 24 VDC matches common control power buses and keeps switching transients low. When delivering rated load, the armature draws 6.9 A, which helps size conductors, fusing, and drive transistors. Output torque scales linearly with current at a constant of 8.6 oz-in/A, so a 5 A command produces about 43 oz-in of shaft torque. This proportional behavior helps the amplifier produce predictable acceleration and deceleration on light loads. The magnetic circuit uses Alnico V-7 material, providing stable flux over a wide temperature range and supporting repeatable dynamic response. This alloy helps reduce demagnetization risk during peak currents.

Because the frame relies on convection and conduction, it has no forced-air cooling, so installation must permit free airflow around the housing during extended duty cycles. A standard analog tachometer is fitted and produces a proportional voltage for velocity loops, so the drive can regulate speed without digital processing overhead. There is no optical encoder attached, so position resolution depends on the control system rather than onboard digital feedback hardware. Systems that need absolute or incremental position data must obtain that information from an external feedback device or from the driven mechanism. Classified as a DC servo motor, the device integrates easily with linear PWM amplifiers and single-direction flyback diodes used in compact motion stages.