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DC Motor

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Rural Technology

DC motors & DC generators are essentially the same. In a motor electrical power forces the armature to turn and the moving armature. A DC motor converts electrical energy into mechanical energy. fig. 4 D C Motor Do you know on what principle motor works? when a current flows through the coils a coil itself acts as a magnet & the coil is moved by the force between the magnetic field. This is the principle of operation of DC motors.

Classification of DC motors -

There are three main types of motors which are as follows :
1. Series Motor
2. Shunt Motor
3. Compound Motor

1) Series motor -

The motor in which the field winding is connected in series with the armature, is called a series motor. The field winding consists of a few turn Sothic enameled copper wire as shown in figure - fig. 5 Series Motor A series motor should not be run without a load is necessary for controlling its speed or otherwise it will run at a very high speed. Therefore it is used for such jobs in which a load is always present at the meter.

2) Shunt motor -

The motor in which the field winding is connected across the armature is called a shunt motor. The field winding consists of a large number of turns of fine enameled copper wire to provide a high resistance as shown in figure - Fig 6 Shunt Motor The speed of a shunt motor remains almost constant & is not effected by the load variations. The motor cant be started with a heavy load. It is suitable for stable & light load.

3) Compound motor -

The motor in which one part of field winding is connected in series & the other part is connected across the armature is called a compound motor.

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Rural Technology