Question
Download Solution PDFThe current in a starting winding of a capacitor-start induction-run single phase motor:
This question was previously asked in
SSC JE EE Previous Paper 10 (Held on: 10 Dec 2020)
Answer (Detailed Solution Below)
Option 4 : is leading with respect to voltage of the main winding
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RRB JE CBT I Full Test - 23
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Detailed Solution
Download Solution PDF- A capacitor-start motor is a single-phase induction motor that employs a capacitor in the auxiliary winding circuit to produce a greater phase difference between the current in the main and the auxiliary windings.
- The figure below shows the connection diagram of a capacitor start motor.
- The capacitor start motor has a cage rotor and has two windings on the stator. They are known as the main winding and the auxiliary or the starting winding. The two windings are placed 90 degrees apart.
- A capacitor CS is connected in series with the starting winding. A centrifugal switch SC is also connected in the circuit.
- The phasor diagram of capacitor start motor is shown below:
- IM is the current in the main winding which is lagging the auxiliary current IA by 90 degrees as shown in the phasor diagram above. The auxiliary current IA leads the voltage.
- As the motor approaches its rated speed, the auxiliary winding and the starting capacitor is disconnected automatically by the centrifugal switch provided on the shaft of the motor.
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