Question

Construction off electric motor..pointwise..(asap)​

Answer 1

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An electric motor is a device which converts electrical energy into mechanical energy.

Construction: An electric motor consists of the following main parts:

1. Field magnet: It is a strong horse shoe type magnet with concave poles.

2. Armature: It is a rectangular coil ABCD having a large number of turns of thin insulated copper wire wound over a soft iron core.

The armature is placed between the poles of the field magnet and it can be rotated about an axis perpendicular to the magnetic field lines.

3. Split ring commutator: It consists of a cylindrical metal ring split into two halves S1and S2. The two ends A and D of the armature coil are connected to the split rings S1 and S2 respectively. As the coil rotates, the split rings also rotate about the same axis of rotation. The function of the split ring commutator is to reverse the direction of current in the coil after every half rotation.

4. Brushes: Two graphite or flexible metal rods maintain a sliding contact with split rings S1 and S2, alternately.

5. Battery: A battery of few cells is connected to the brushes. The current from the battery flows to the armature coil through the brushes and the split rings.

Answer 2

Answer:

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

Principle of motor : A motor works on the principle that when a rectangular coil is placed in a magnetic field and current is passed through it. A force acts on the coil which rotates it continuously.

Construction and Working of motor:

When electric current is passed into the rectangular coil, this current produces a magnetic field around the coil.

The magnetic field of horse shoe-type magnet then interacts with the magnetic field of the coil and causes the coil to rotate continuously.

If ABCD is in horizontal position current from battery enters the coil through brush B

1

, and commutator half ring C:. The current flows in the direction ABCD

and leaves via ring and brush B

2

The direction of current is from A to B, the direction of current is from C to D. The force on side AB of the coil is in the downward direction. Whereas the force on the side CD of the coil is in the upward direction. ABCD rotate in anti-clockwise direction.