What is the working principle of ac motor?

Answer 1

AC commutator motors, like comparable DC motors, have higher starting torque and higher speed than AC induction motors. The series motor operates well above the synchronous speed of a conventional AC motor. AC commutator motors may be either single-phase or poly-phase. The single-phase AC version suffers a double line frequency torque pulsation, not present in poly-phase motor. Since a commutator motor can operate at much higher speed than an induction motor, it can output more power than a similar size induction motor. However commutator motors are not as maintenance free as induction motors, due to brush and commutator wear.

Answer 2

Since magnetic fields have the capacity to either attract or repel other magnetic fields depending upon polarity, they can be used to either push or pull on things, and if you arrange them just right, you can make an axle rotate, which can then be used for all sorts of useful mechanical purposes.

Answer 3

An electric motor is an electric machine that converts electrical energy into mechanical energy.

In normal motoring mode, most electric motors operate through the interaction between an electric motor's magnetic field and winding currents to generate force within the motor.

The rotor is the moving part, which turns the shaft to deliver the mechanical power. The rotor usually has conductors laid into it which carry currents that interact with the magnetic field of the stator to generate the forces that turn the shaft.

Electric motors operate on three different physical principles: magnetic, electrostatic and piezoelectric. The most common principle employed is the magnetic.