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Written Pole Motors

Lee Layton, PE

This is a three-hour about a relatively new form of single-phase induction motor known as the Written-PoleŽ Motor. The motor was developed by Precise Power Corporation and it uses an innovative approach of controlling the magnetic field of the motor to reduce the starting current requirements. The result is a motor that has starting current requirements of only about twice the normal running current and, as an added benefit the motor has an efficiency of 90% or better. The Written-PoleŽ motor has been developed with inherently low per-unit starting current and they can be applied in single-phase service areas to ratings of over 100 hp without exceeding the starting current limits of many utility systems.

This course includes a multiple-choice quiz at the end, which is designed to enhance the understanding of the course materials.

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