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The speed of a 4-poleinduction motor is controlledby varying the supplyfrequency while maintainingthe ratio of supply voltage tosupply frequency (V/f)constant. At rated frequencyof 50 Hz and rated voltage of400V its speed is 1440 rpm.Find the speed at 30 Hz - if theload torque is constant.

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The speed of a 4-poleinduction motor is controlledby varying the supplyfrequency while maintainingthe ratio of supply voltage tosupply frequency (V/f)constant. At rated frequencyof 50 Hz and rated voltage of400V its speed is 1440 rpm.Find the speed at 30 Hz - if theload torque is constant.






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