SRF3643-4593-7-56C Pacific Scientific
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The Pacific Scientific SRF3643-4593-7-56C is a permanent magnet DC motor from the Permanent Magnet DC Motors series. It offers a rated power of 1 HP, a rated speed of 1750 RPM, and operates at 90 VDC with a continuous duty rating. This SCR rated motor features a TEFC enclosure and NEMA C face mounting, with a rated current of 9.6 amps.
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Product Description:
Pacific Scientific manufactures the SRF3643-4593-7-56C within its Permanent Magnet DC Motors series. As a permanent-magnet DC machine, the unit converts direct-current energy into controlled mechanical rotation for conveyors, indexing tables, and other speed-regulated axes in automated lines. It integrates with SCR drives and standard NEMA C-face gearheads, supplying constant torque across its rating for low-voltage, variable-speed sections of industrial equipment. That arrangement supports straightforward integration in machines that use armature-voltage control rather than closed-loop servo hardware.
At the electrical interface, the motor is rated for 90 VDC, allowing it to pair directly with standard SCR speed controllers that modulate armature voltage. Under that supply, the armature current reaches 9.6 A, a value used to size branch protection and cable gauge. The electromagnetic package delivers 1 HP of shaft power for compact pumps, fans, and similar driven loads. Nominal output speed is 1750 RPM, so common reduction ratios can be selected with familiar motor-speed conventions. The construction is intended for continuous duty, so temperature rise remains within insulation limits during uninterrupted operation. The rated operating point also supports direct calculation of torque and required reduction when the motor is paired with a gearbox or belt drive.
The motor is SCR rated, so its commutation reactance and brush design tolerate the ripple current produced by single-phase rectifier drives without excessive sparking. A TEFC enclosure shields the windings from airborne dust, and an external fan maintains airflow during operation. Installation is simplified by the NEMA C-face mount, whose standardized flange matches reducers and hydraulic pumps without shims or alignment plates. Because it uses a permanent-magnet DC design, no field winding is required, which reduces overall power consumption and supports quick torque response during speed changes commanded by the drive system. The absence of a field winding also removes the need for separate field excitation wiring, which simplifies the motor connection.
