Product Description:

The SR3644-4963-7-1 is a permanent-magnet direct-current motor manufactured by Pacific Scientific as part of the Permanent Magnet DC Motors series. This unit serves as a drive element in automated equipment, converting direct-current energy into controlled mechanical rotation for conveyors, presses, and extruders. When paired with a silicon-controlled-rectifier (SCR) speed controller, the motor gives machine builders a compact means of implementing variable speed without the complexity of field-oriented AC drives, while still offering the high starting torque demanded by cyclic industrial loads.

At its rated operating point, the motor accepts a supply of 111 VDC from a phase-controlled rectifier and draws 7.6 A of armature current. Under these electrical conditions, the armature and field magnets generate a shaft output of 1.5 HP, delivered at 3100 rpm. Because the armature is designed for an SCR-rated drive, commutation ripple produced by the rectifier remains within limits that keep torque pulsation low. The permanent magnets eliminate the need for a separate field winding, which reduces losses and shortens the electrical time constant. Together, these characteristics let the motor respond quickly to voltage changes issued by the speed controller.

Mechanical integration is simplified by the TENV enclosure, which seals the windings and relies on surface convection, making the motor suitable for dusty indoor sites where external airflow is undesirable. As a Permanent Magnet DC machine, it maintains high torque at low speed and supports regenerative braking profiles common in web processing lines. Its designation as a DC Drive Motor indicates compatibility with controllers that regulate armature voltage, and this arrangement supports smooth speed adjustment without frequency-based control.