What is the difference between an electromagnetic coil and an exciting coil?

What is the difference between an electromagnetic coil and an exciting coil?

The electromagnetic coil is the so-called coil used to generate electromagnetic. Since the discovery and discovery of electromagnetic coil, the application of electromagnetic coil has been extended in our life. The working field is called excitation for generators and other electrical equipment used in electromagnetic induction. Sometimes the device that provides rotor power to the generator rotor is also called excitation.

The principle of electromagnetic coil: it is built by the magnetic field around the wire. It is twisted into a spiral to strengthen the magnetic field, that is to use the smallest space to achieve the highest magnetic field strength, and to replace the ordinary wire with a layer of insulating varnish in order to save space.

Excitation in excitation coil is the meaning of excitation. Through the changing current in the coil, the center of the circle has the magnetic line of force, the larger the current, the more magnetic lines of force, until the saturation, disconnect the current, the magnetic line of force disappears, this is called the excitation coil.