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Home » Class 10 » Magnetic Effects of Electric Current » Electric Motor

Electric Motor

Last Updated on November 23, 2024 By Mrs Shilpi Nagpal

Question 1 What is an electric motor?

Question 2 On what principle does electric motor works?

Question 3 Explain the construction and working of electric motor?

Question 4 Give commercial use of electric motor?

Question 5 Give uses of D.C. motor?

Contents

  • 1 Electric Motor
    • 1.1 Principle of Electric Motor
  • 2 Construction of Electric Motor
    • 2.1 (1) Armature coil
    • 2.2 (2) Strong field magnet
    • 2.3 (3) Split ring type commutator
    • 2.4 (5) Battery
    • 2.5 Working of Electric Motor
  • 3 The Commercial Motor uses
  • 4 Uses of D.C. Motor

Electric Motor

Electric motor

Fig. Diagram of Electric Motor


Electric Motor
is a device which converts electrical energy into mechanical energy.

Principle of Electric Motor

The principle of the electric motor is based on the fact that a current carrying conductor produces a magnetic field around it. A current carrying conductor placed perpendicular to magnetic field experiences a force.

Construction of Electric Motor

(1) Armature coil

It consist of a single loop of an insulated copper wire in the form of a rectangle ABCD.

(2) Strong field magnet

Armature coil is placed between 2 pole pieces of a strong magnet which provide strong magnetic field.

(3) Split ring type commutator

It consist of 2 halves of a metallic ring. The two ends of armature  coil are connected to these 2 halves of ring. Commutators reverses the direction of current in armature coil. The inner sides of these halves are insulated and attached to axle.

(4) Brushes

The external conducting edges touch the two stationary carbon brushes which press against the commutator. These brushes act as contact between commutator and terminal battery. These brushes are connected to a source called battery.

(5) Battery

It is connected across the carbon brushes. It supplies current to the armature coil.

Working of Electric Motor

(i) In the side AB of the rectangular coil ABCD, the direction of current is from A to B and in the side CD of the coil, the direction of current is from C to D. The direction of magnetic field is from N pole of the magnet to its S pole.

(ii) Applying Fleming’s Left hand rule to sides AB and CD of the coil, the force on side AB of the coil is in downward direction whereas the force on side CD of the coil is in upward direction. Due to this the side AB of the coil is pushed down and side CD is pushed up. This makes the coil ABCD rotate in the anticlockwise direction.

(iii) While rotating, when the coil reached vertical position, then the brushes will touch the gap between the two commutator rings and current of the coil is cut off. Though the current to the coil is cut off when it is in the exact vertical position, the coil does not stop rotating because it has already gained momentum due to which it goes beyond the vertical position.

(iv) After half rotation, when the coil goes beyond vertical position, the side CD of the coil comes on the left side whereas side AB of the coil comes to the right side, and the two commutator half rings automatically change contact from one brush to the other.

(v) After half rotation of the coil , the commutator half ring X makes contact with brush P whereas the commutator half ring Y makes contact with brush Q. This reverse the direction of current in the coil.

(vi) The reversal of direction of current reverses the direction of force acting on the sides AB and CD of the coil. The side CD of the coil is now on the left side with a downward force on it whereas the side AB is now on the right side with an upward force on it. Due to this the side CD of the coil is pushed down and the side AB of coil is pushed up. This makes the coil rotate anticlockwise by another half rotation.

(vii) The reversing of current in the coil is repeated after every half rotation due to which the coil continue to rotate as long as current from the battery is passed through it.

The Commercial Motor uses

(1) Electromagnet in place of permanent magnet.

(2) A soft iron core on which coil is wound.

Uses of D.C. Motor

It is used in electric cars, rolling mills, electric cranes, lifts, drilling machine, fan, hair dryers, blowers, tape recorder, refrigerators, washing machine, mixers, blenders.

Filed Under: Class 10, Magnetic Effects of Electric Current Tagged With: armature coil, battery, brushes, commercial motor, electric motor, principle of electric motor, split ring type commutator, strong field magnet

About Mrs Shilpi Nagpal

Author of this website, Mrs. Shilpi Nagpal is MSc (Hons, Chemistry) and BSc (Hons, Chemistry) from Delhi University, B.Ed. (I. P. University) and has many years of experience in teaching. She has started this educational website with the mindset of spreading free education to everyone.

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    July 24, 2018 at 9:03 am

    In context to electric motor, a couple refers to two parallel forces that are equal in magnitude, opposite in sense and do not share a line of action. A better term for this is force couple or pure moment

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