There are two main types of ceiling fans. One is the ceiling fan with large capacity that can regulate speed. Its working principle is the working principle of a single-phase asynchronous motor. It is only to wrap the squirrel cage rotor around the stator embedded with two-phase windings. Since single-phase power cannot generate rotating magnetic field, one of the windings must be connected in series with a capacitor to achieve the purpose of phase separation.
The other is the breeze ceiling fan. Its working principle is a synchronous motor excited by permanent magnet. Since the synchronous motor is difficult to start, a spring must be used to help it start.