Product Description:

The SR3624-8291-7-56BC-CU permanent-magnet DC motor is manufactured by Pacific Scientific as part of its Permanent Magnet DC Motors series. The unit converts 90-volt direct current into rotary motion for conveyors, feeders, and compact machine tools that require repeatable speed in open-loop automation. Fixed field magnets eliminate the need for separate excitation, which helps keep the drive package simple and supports predictable torque across the operating range. This arrangement also reduces external wiring compared with separately excited DC motor layouts.

The motor produces a continuous shaft load of 9.0 lb-in while drawing 2.7 A, which represents its steady operating point during extended duty. When the armature is supplied with 90 VDC, it maintains a base speed close to 1750 rpm, giving a useful reference for pulley and gear selection. For rapid starts or momentary load spikes, the winding can accept up to 54.0 A without permanent damage, allowing brief overload capability. The totally enclosed, non-ventilated housing keeps abrasive dust away from the brushes and commutator and relies on surface cooling rather than forced airflow. This enclosure style is useful where airborne debris makes open ventilation less desirable.

Control response is influenced by an armature inductance of 9.6 mH, which affects current rise in PWM drives. A torque constant of 3.9 lb-in/A provides a direct relationship between current and developed torque, which helps speed regulation remain consistent under changing load. The output shaft diameter is 0.6250 in, and the motor uses a NEMA 56C face with a keyed shaft for direct coupling to standard gear reducers. Rotor inertia and overall mass support moderate acceleration without excessive overshoot, and the total weight is 18 lb. The 1/4 horsepower rating fits compact DC drive packages used in low-power automation equipment.