Product Description:

The SR3642-4822-7-CU is a permanent-magnet DC motor produced by Pacific Scientific within the Permanent Magnet DC Motors series. In industrial automation, this unit converts direct-current supply into regulated rotary motion for conveyors, actuators, and indexing devices that need constant speed over long duty cycles. Its compact 56C frame and NEMA C face mounting let the motor attach directly to gear reducers or pump heads without alignment adapters while helping keep shaft runout low.

For continuous operation, the winding is energized at 90 VDC; at this voltage the armature draws 4.7 A and develops 18.0 lb-in of steady torque. The magnetic circuit delivers that torque in proportion to current through a torque constant of 4.2 lb-in/A, which helps make speed regulation more predictable from commanded current. Copper losses are limited by the armature’s low resistance of 0.9 Ω, while the 3.8 mH inductance smooths commutation so current transients do not propagate into the DC bus. Together these parameters establish the motor’s thermal load line and help keep the winding temperature within insulation limits during extended runs.

The motor is rated for 1/2 HP at a base speed of 1750 RPM, allowing it to drive medium-inertia loads without external gearing. Short bursts of mechanical demand are supported by a peak current capability of 74.0 A, which provides overload margin for acceleration or momentary jams. The totally enclosed nonventilated construction, denoted as TENV, blocks airborne contaminants so the motor can be mounted near cutting fluids or fine particulates. An overall length of 12.10 in keeps the package compact, and its 27 lb weight provides enough mass for vibration damping without overstressing standard machine frames. The flange geometry matches common pump and gearbox interfaces.