PDH Online Course Description PDH Units/
Learning Units (Hours)
Sizing Supply Conductors for Two-Speed Single Winding Induction Motors

Timothy O'Hearn, P.E.

Two-speed single winding variable torque motors are commonly used in process facilities on air coolers. These motors have two horsepower ratings, two speed ratings, and two full-load current ratings. Because the motor has a single winding the speed change is accomplished by changing the wiring configuration and the number of stator circuits. These changes are described in NEMA MG1. The application is described including recommendations for sizing the supply conductors for avoiding application problems. This course includes a multiple-choice quiz at the end, which is designed to enhance the understanding of course materials.

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