Circuit Induction Motor 3 Phase

Circuit Induction Motor 3 Phase

Induction motor 3 phase can be analyzed by using the equivalent circuit of one phase. Work factor can be calculated using the impedance vector calculating input, but this may not be able to give an immediate association between the input voltage to decrease with the increase of power factor. For this analysis the amount of torque required and speed rotary motor that can be represented by the amount of slip.

the motor terminal voltage is reduced then the torque The maximum motor will be reduced. In order to keep the amount of torque generated is speed will be reduced. With a maximum torque of the motor voltage is more specific smaller than the load torque, in this condition the motor will be at the work area unstable and quickly the motor will stop (stalling) so that the current is very great.

Torque and Rotational Speed curve

In the real situation when the motor load is held fixed, and its terminal voltage is reduced then the round will be reduced, so the equivalent rotor resistance is increased. This voltage reduction will cause reduction in rotor currents and voltages, thereby reducing the current Ema magnetization. This situation can be explained by the vector diagram.