Product Description:

The 4VM82-008-4 is a permanent-magnet DC servomotor manufactured by Pacific Scientific and supplied within the Low Inertia PMDC Servomotors series. The motor converts armature current into torque for precision positioning or speed control in pick-and-place stages, light conveyors, and similar motion axes common to factory automation. Its reduced rotor inertia supports rapid acceleration and deceleration cycles demanded by indexing tables and assembly equipment. In the model designation, the number identifies the frame size, winding code, and feedback configuration used when matching the motor to a compatible drive.

At the electrical interface, the rated armature supply is 30 V, and the winding draws a continuous current of 7.4 A during nominal load. Together with the coil resistance of 0.80 Ohms, these values determine the motor’s electrical loading and the heat that the control electronics must manage. The rotor’s permanent field is generated by Alnico V-7 magnets, which provide stable flux density over a wide temperature range and help reduce the risk of demagnetization during short overloads. This allows the motor to maintain predictable velocity behavior across repeated duty cycles.

The thermal design relies on convection because the motor uses no forced-air cooling, so the mounting surface must provide an adequate heat sink for continuous service. Feedback is provided by an optical encoder that outputs a square dual-channel waveform with a zero index pulse, allowing the controller to detect direction and establish a home reference. The output shaft measures 0.500 in in diameter, providing a standard interface for couplings or pulleys while preserving torsional rigidity. Because there is no auxiliary analog tachometer attached, speed loop control must rely exclusively on the digital encoder signal.