The stator and the rotor are two main components in an AC induction motor. Torque is generated in two ways, which are through the stator’s magnetic field and the current in two bars that are connected to the rotor. As the AC induction motor runs, the magnetic field’s speed becomes slower, as compared to the rotor speed. The only means of producing greater torque is once rotation leads to a dissection of the magnetic field, which is caused by the rotor bars.
An induction motor slip is a difference between the motor’s speed at a full load and the synchronous speed. Percent slip is a method of calculating the electric motor’s performance. To gain useful torque that continuously increases along with the heavier load, slip in the motor is necessary.
Certain parameters involved with the performance of the motor affects the motor slip. Moreover, the slip depends on the similar proportion as the stator’s voltage frequency, rotor resistance and load torque. When you increase the slip, it is possible to control the wounded motor’s induction speed. Another way is once the rotor circuit is subjected to higher resistance. Generally, motors with lower horsepower naturally have much higher slip than those with high horsepower. The reason behind this is that greater resistance can be generated easier in the rotor winding, in the case of small motors.
At the onset of the motor’s rotation, the slip is at 100 percent of the voltage at its maximum level. These are typical scenarios in an induction motor slip. However, there is a reduction in the voltage and the slip with the turning action of the rotor. Since frequency is proportional to the slip, a reduction in slip is caused by a decrease in the frequency. Moreover, the slip and frequency are factors that affect the induction motor’s inductive reactance. The maximum level of the inductive reactance, slip and frequency are achieved once the rotor is in a stationary condition. As it turns, power factor goes down to 1, and there is a constant low-level of the inductive reactance.
The continuous and increase in the motor’s speed cause a reduction in the inductive reaction, which eventually becomes equivalent to the resistance. It is only when the motor begins to rotate that impedance is inductive while the inductive reactance is high. Considering the fact that it never happens that the slip reaches 0, then it remains capable of driving the rotor efficiently in induction motors. Any force that exists between the stator and rotor is the result of zero slip, which further causes the rotor to stop its rotation and the stator, reaches 0. The slip also becomes effective once there is an attraction formed between both the stator and the rotor.