Product Description:

The SRF3643-4593-7-5-56C is a permanent magnet DC motor produced by Pacific Scientific within the Permanent Magnet DC Motors series. In automation cells, this motor converts direct current into rotary motion that can be transmitted through gearboxes or belt drives to actuate machinery. Its permanent magnets eliminate the need for an external excitation circuit, which simplifies control and supports stable speed regulation with solid-state controllers. This motor type is commonly used where compact variable-speed operation is needed for conveyors, feeders, and other continuously driven machine functions.

This model is designed for 1 HP of mechanical output, which means it can sustain roughly 746 W of shaft power at its operating point. That output is achieved at 1750 RPM, a base speed that works well with standard reducers and belt-driven loads. The armature receives 90 VDC, so the power source must supply filtered and regulated direct current at that level. Under full load, the motor draws 9.6 A, which helps determine conductor sizing and protective device selection. The duty rating is continuous, so the motor can run at full-load current without periodic cooling pauses when it operates within its thermal limits.

The motor is SCR rated, meaning its commutation and insulation are compatible with the pulsating waveform produced by silicon-controlled rectifier controls used in many legacy DC drives. A TEFC enclosure keeps airborne debris away from the windings while an external fan moves cooling air across the housing. Installation is simplified by the NEMA C-face mount, which allows direct registration to reducers, pumps, and other driven equipment. Torque is delivered through a shaft measuring 0.625 in in diameter, so standard keyed hubs, couplings, and pulleys can be fitted without custom machining. This enclosure style is useful in industrial spaces where open-frame motors would be more exposed to dust and debris.