Design of single phase capacitor start induction motor intimidating words

Posted by / 16-Aug-2017 13:11

Design of single phase capacitor start induction motor

The role of the starting capacitor is to lag the current in the auxiliary winding, bringing these two currents out of phase.When the rotor reaches sufficient speed, the auxiliary coil is disconnected from the circuit by means of a centrifugal switch, and the motor remains powered by a single coil creating a pulsating magnetic field.The capacitance value of run capacitors is usually lower than the capacitance of start capacitors, and is often in the range of 1.5 µF to 100 µF.Choosing a wrong capacitance value for a motor can result in an uneven magnetic field, which can be observed as uneven motor rotation speed, especially under load.

Some single phase AC motor designs use motor run capacitors, which are left connected to the auxiliary coil even after the start capacitor is disconnected by the centrifugal switch.These motors are not practical due to their inability to reliably start rotation on their own.One way to improve on the single coil design is by using an auxiliary coil in series with a motor starting capacitor.The auxiliary coil, also called starting coil, is used to create an initial rotating magnetic field.In order to create a rotating magnetic field, the current flowing through the main winding must be out of phase in respect to the current flowing through the auxiliary winding.

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AC induction motors usually use two or more coils to generate a rotating magnetic field, which produces torque on the rotor.

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