Product Description:

The 42VM62-201-5 is a permanent-magnet DC motion unit produced by Pacific Scientific and supplied within the Low Inertia PMDC Servomotors series. As a low-inertia rotor design, the motor accelerates and decelerates quickly, making it suitable for positioning axes, pick-and-place arms, and other short-stroke automation where rapid response and precise speed control are required. In such systems, the servomotor forms the electromechanical interface between the drive electronics and the mechanical load, converting commanded current into controlled torque while its compact frame simplifies integration into equipment racks and small gantries.

The armature is designed to draw a continuous current of 7.7 A, so the paired drive must be sized to supply that level without overheating. An armature rating of 30 VAC establishes the nominal electrical input that achieves rated speed and torque. Thermal regulation relies on air inlets and outlets with baffles, which guide ambient air through internal passages as the rotor turns to remove heat from the windings. Flux is produced by Alnico V-7 magnets, a cast alloy that delivers stable field strength across a wide temperature window and resists demagnetization during peak currents. For position or velocity feedback, the motor carries a sine single-channel encoder; its analog sinusoidal waveform provides incremental resolution, although the absence of an index pulse requires external homing logic during startup.

A cylindrical steel shaft measuring 0.344 to 0.406 in in diameter supports keyed or clamp couplers and keeps torsional runout within application limits across the Low Inertia PMDC Servomotors family. Speed feedback from a tachogenerator is not available because there is no analog tachometer mounted on this model, so systems needing voltage-proportional velocity signals must obtain them from the drive or add an external sensor. Tight control loops remain feasible because the lightweight rotor and the direct-commutated nature of a PMDC servomotor minimize response lag and simplify current regulation.