Electric Motors and Generators
Magnetism: Motors and Generators
The turning of a coil in a magnetic field produces motional emus in both sides of the coil which add. Since the component of the velocity perpendicular to the magnetic field changes sinusoidally with the rotation, the generated voltage is sinusoidal or AC. This process can be described in terms of Faradays law when you see that the rotation of the coil continually changes the magnetic flux through the coil and therefore generates a voltage.
As in the DC Motor case, a current is passed through the coil, generating a torque on the coil. Since the current is alternating, the motor will run smoothly only at the frequency of the sine wave. It is called a synchronous motor. More common is the induction Motor, where electric current is inducted in the rotating coils rather than supplied to them directly.
turn an electric motor into a generator