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For controlling the speed of an induction motor, if the supply frequency is reduced by 10% then to maintain the same magnetizing current the supply voltage should be

  • For controlling the speed of an induction motor, if the supply frequency is reduced by 10% then to maintain the same magnetizing current the supply voltage should be Decreased by 10%.
  • When the supply frequency is reduced by 10% to control the speed of an induction motor, the magnetizing current should be maintained constant.
  • The magnetizing current depends on the supply voltage and frequency.
  • The voltage and frequency are reduced proportionally in order to maintain the magnetizing current.
  • Therefore, if the supply frequency is reduced by 10%, the supply voltage should also be reduced by 10% to maintain the same magnetizing current.