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Electrical machines miscellaneous

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Electrical machines miscellaneous
  1. A single phase induction motor is provided with capacitor and centrifugal switch in series with auxiliary winding. The switch is expected to operate at a speed of 0.7 N s, but due t o malfunctioning the switch fails to operate. The torque-speed characteristic of the motor is represented by

    1.



Correct Option: C

In 1- φ induction motor the centrifugal switch is expected to operate at 0.7 Ns but it fails to operate. Then there is no increase in the torque after 0.7Ns Hence (c) is correct.


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