Induction Motor - How it works

Induction motor is commonly used in the aircraft. It is robust, simple and can last a long time.

Principle of Operation.
It works on the principle of rotation magnetic field, the stator is connected to the 3 phase power supply, and the rotor consist of a caged aluminium bars. Current is induced in the rotor which flows in the cage to form electromagnet. The rotor will follow the rotation of the stators field.

Rotating magnets formed by 3 pairs of stator windings connected to the 3 phase AC power.

The 3 phase supply offers the natural 3 phase rotation field.









Construction

Take note of the 2 major parts of the induction motor, the rotor and the stator. The stator is fitted with 3 pairs of windings, correspond to the the phases, A,B and C. The rotor consists of copper bars joined at both ends.

The Operation
When the star windings are connected to the 3 phase supply, the winding A and A1 will form North and South poles. You can imagine the north pole start at winding A, than it moves to pole B and next to the pole C.


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