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why induction motor having low power factor at starting time
and high at full load.
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Answer Posted / kiran kumar c
At the starting condition, the induction motor draws higher magnetisation component of current in order to overcome the reluctance offered by air gap between stator and rotor. Then the total current increases.A motor which exhibits a high starting current, i.e. 850% will generally produce a low starting torque, The induction motor operates due to the torque developed by the interaction of the stator field and the rotor field. Both of these fields are due to currents which have resistive or in phase components and reactive or out of phase components. The torque developed is dependant on the interaction of this phase components "A low rotor resistance will result in the current being controlled by the inductive component of the circuit, yielding a high out of phase current and a low torque".
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