AC Primary Motor Resistor

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Description:

In AC Primary motors, the conductors in the rotor slots are shorted at the ends. Therefore, the resistance of the conductors is fixed and cannot be changed. However, resistors can be connected in-line with the motor to reduce the starting voltage. During the acceleration period at the moment a motor is started, it draws a high "inrush" current. Resistors can be used to reduce the full line, starting voltage applied to the motor. Commonly known as a ballast resistor, the resistor acts as a voltage divider and reduces the inrush current, providing a "soft start."

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Powerohm Resistors, Hubbell ICD / 5713 13th Street / Katy, Texas 77493