Regeln » Start/run capacitor AC induction motors

Another way to further improve on the single-coil single-phase induction motor design is to introduce an auxiliary coil, which remains powered not only during the motor startup phase, but also during normal operation. As opposed to an AC motor using only a motor start capacitor, which creates a pulsating magnetic field during normal operation, AC motors using a motor start capacitor and a motor run capacitor create a rotating magnetic field during normal operation. The function of the motor start capacitor remains the same as in the previous case – it gets disconnected from the circuit after the rotor reaches a predetermined speed by means of a centrifugal switch. After that point, the auxiliary winding remains powered through a motor run capacitor. The figure below describes this type of design.

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