three phase - Why is the torque vs slip speed characteristic of an induction motor costant with respect to the frequency of the voltages applied? - Electrical Engineering Stack Exchange

I'm currently studying the induction motor and I have some troubles to understand which causes this thing. Let $$w_2 = w_1 - w_r$$ be the slip velocity and $$s = w_2 / w_1$$ be the slip, where w_1

Solved A 3-phase induction motor has the torque speed curve

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