Question

# Electric machine

Q11. Given the transformation of current, can we obtain the transformation of

voltage and impedance for invariant power transformation? Give your explanation.

Q12. Besides invariance power, can we realize identical transformation for current and voltage? Give your explanation.

Q13. With the Clarke's transformation, can we keep the mmf produced by the new two-phase winding the same as the mmf produced by its original three-phase winding? Give your explanation.

Q14. Is there any application of three-phase symmetrical components transformation for the performance analysis of electric machines? Give your explanation.

Q15. Are there any situations that the analysis result using the three-phase symmetrical components transformation is not very accurate? Give your explanation.

Q16. According to the equivalent circuit of a three-phase induction motor, can we deduce the formulas for electromagnetic torque calculation? Give your explanation.

Q17. Can the three-phase symmetrical components transformation be used to study

single-phase operation (a fault condition) of a three-phase induction motor? Give your explanation.

Q18. Is there any situation that the negative-sequence equivalent circuit can be applied to study the relationship between applied voltage and phase current? Give your explanation.

Q19. When a star-connected three-phase induction motor is operating at a speed lower than its synchronous speed, if one phase winding is open-circuited suddenly, can the rotor still rotate? Give your explanation.

Q20. If one phase winding of a star-connected three-phase induction motor is open-circuited, can the motor be self started (start the rotor from standstill)? Give your explanation.

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