The electromagnet is positioned between the poles of another magnet. When current from the voltage source flows through the coil, a magnetic field is usually created around the electromagnet. The poles of the magnet interact with the poles of the electromagnet, causing the motor to turn. … The more coils, the more powerful the motor.
When a power current flows through a loop or coil of wire, placed between your two poles of an electromagnet, the electromagnet exerts a magnetic force on the wire 
and causes it to rotate. The rotation of the wire Electromagnetic Motor china starts the electric motor. As the wire rotates, the electric current changes directions.