Question
Download Solution PDFIn induction motors:
(A) In regenerative breaking, the synchronous speed is greater than rotor speed
(B) The slip is Negative in regenerative breaking
(C) In regenerative breaking rotor speed is greater than synchronous speed
(D) The slip is positive in regenerative breaking
Choose the correct answer from the options given below:
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFSlip diagram of induction motor
The slip of the induction motor is given by:
\(s={N_s-N_r\over N_s}\)
where, s = Slip
Ns = Synchronous speed
Nr = Rotor speed
An induction motor can work in three modes:
|
Mode |
Slip (s) |
|
Motoring |
0 ≤ s ≤ 1 |
|
Plugging |
s > 1 |
|
Generating |
s < 0 |
In generating mode, the slip is negative when Nr > Ns
The correct statements are B and C.
∴ The correct answer is option 3.
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