Question

principle of electric motor​

Answer 1

Answer: principle of electric motor: 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 continuously.

Answer 2

An electric motor uses the attraction and repulsion of magnetic fields to produce motion. The simplest is the permanent magnet motor. A simplified version is shown below.

Placing a coil of wire inside a permanent magnetic field and fixed so it can freely rotate. Pass a current through the coil of wire and it will rotate to the perpendicular position. Now reverse the current flow and the coil will spin 180 degrees. The brushes and the commutator does the switching directions of the current through the coil at the appropriate moment to keep the coil rotating in one direction. This is the basics of all electric motors.

Fleming’s left hand rule above describes the relationship between the main magnetic field. The current flowing in the coil and the direction of the movement or force

Now we can use electronics to do the switching instead of the commutator and brushes. These motors are called Brushless DC motors.

Larger motors require a stronger magnetic field and more electrical ,power to drive it faster and with more torque. Stronger magnetic fields are created by electromagnets.

AC motors use induction from the stationary windings to create the second magnetic field in the rotor. That induces currents in the rotor and these currents have their own magnetic field which interact ( repel and attract) with the main magnetic field to make the rotor rotate.