A 3 phase induction motor is controlled by voltage and frequency contr – InterviewSolution

InterviewSolution

1.	A 3 phase induction motor is controlled by voltage and frequency control such that the ratio V/ is constant. At 50 Hz, the speed is 1440 rpm. At 25 Hz, the speed is likely to be
Answer» In this case synchronous speed at 50 Hz is 1500 rpm. Therefore synchronous speed at 25 Hz is 750 rpm. Since slip is about 3 - 5%, speed is about 720 rpm.

Discussion

No Comment Found

Related InterviewSolutions

In a dual converter both converters work as rectifiers.
A single phase full wave regulator feeds R-L load. The best gating signal is
A 3 phase induction motor is fed by a 3 phase ac regulator to change the stator voltage. The variation in speed will be more if
A cycloconverter cannot give a frequency higher than input frequency.
A dc circuit breaker must use
In a single phase full wave regulator feeding R-L load, the minimum firing angle can be zero.
An RC snubber circuit is used to protect a thyristor against :
UJT can be used for
In a series inverter supplying a load resistance R, the commutating elements L and C should be such that
In a full wave converter (M - 2 connection) feeding an RLE load, the peak thyristor current is 15 A. For fully controlled bridge circuit and same load current, the peak thyristor current will be