Electric Motor class 10 notes | cbse24

A motor is a device which converts electrical energy into mechanical energy.

They are three type of motor

1. AC Electric Motor (Having Slip Ring)
2. DC Electric Motor(Having commutator or Slit Ring)
3. Special type of motor

• On the basis of Faraday's Law of induction, electric motor work.
• With the help of Fleming's Left-Hand Rule, we find the direction of force acting on the rotor of the electric motor.

DC electric motor

Parts of DC motor:

• Commutator or slit ring
• Rotor
• Carbon Brush
• Permanent Magnet stator or temporary magnet (electromagnet) stator

KeyPoint:

• For fast rotation of rotor, current should be high.
• For fast and smooth rotation, number of coil should be high(means more number of pole). So more number of coil mean more number of commutator for fast switching of current.

Working Principle:

• We can see field direction of magnet is from N⟶S.
• We applied battery so current start flowing through the coil.

            (A) After applying battery current goes from ABCD direction  in the coil.

            (B) Next time Rotor move and current direction goes change from DCBA after switching the direction of rotor (Brush is fixed commutator rotate with rotor and perform switching, so commutator is responsible to convert DC current to AC to perform Induction in coil) 

• By the use of Fleming's Left-Hand  Rule we find the direction of force exerted on coil.
• By the use of Fleming's Left-Hand Rule, we can see that the rotation of the rotor is ACW(Anti Clock Wise)