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# electric machine Q21. If you have a three-phase induction motor but you only have single-phase

power supply, can you make this motor still work? Give your explanation.

Q22. Is there any situation that the magnetic flux can be kept constant during variable speed control of an induction motor? Give your explanation.

Q23. Is there any situation that the magnetic flux cannot be kept constant during variable speed control of an induction motor? Give your explanation.

Q24. Can we realize V/F control for induction motor speed control? Give your explanation.

Q25. Can we use boost voltage method at low speed during variable speed control of an induction motor? Give your explanation.

Q26. Can we use the field weakening method for induction motor control? Give your explanation.

Q27. A three-phase induction motor is operating at its rated speed. If the frequency of the applied voltage is suddenly reduced to the half of its rated voltage, can the motor still output positive electromagnetic torque? Give your explanation.

Q28. A three-phase induction motor is operating at its rated speed. If we interchange any two leads of the stator power supply, can the motor still output positive electromagnetic torque? Give your explanation.

Q29. Can we obtain PWM voltages using power electronic technique? Give your explanation.

Q30. Are there any basic parameters of PWM voltage which can determine the characteristic of its waveform? Give your explanation.

Q31. Can the value of switching frequency affect the quality of PWM waveforms which are applied to drive an induction motor? Give your explanation.

Q32. An induction motor is driven by a PWM driver. Can the value of modulation frequency of PWM waveforms affect the performance of the motor? Give your explanation.

TO ensure 10, is not increased further, while decreasing
frequency', supply voltage must be in ceased
to maintain ( V/) ratio constant during spat speed
conbol below base speed.
But during speed...

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