how can 3phase motor speed can be controlled without vvf drive?

how can 3phase motor speed can be controlled without vvf
drive?

Question Posted / pallabkantighatak

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how can 3phase motor speed can be controlled without vvf drive?..

Answer / umesh ranjan panigrahi

If it is a 3-phase squrel cage induction motor then by
adding external resistance in rotor circuit we can control
speed as well as torque.

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