Question
Download Solution PDFWhich of the following is true, considering the rotor of a three-phase induction motor in the blocked state?
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFConcept
The slip of an induction motor is given by:
where, Ns = Synchronous speed
Nr = Rotor speed
Explanation
The rotor frequency of a 3ϕ induction motor is given by:
When the rotor of a three-phase induction motor is in the blocked state (not rotating), the rotor speed, i.e. Nr = 0
s = 1
The rotor induced frequency is:
Supply frequency = Rotor frequency
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