How it works?
The magnet and coil rotate in the same direction but the magnet moves a little faster than the coil so the coil feels like its moving in the opposite direction which induces a current in the coil which creates a force to keep the motor rotating in one direction…
We can create the same effect by sending a sinusoidal to the fixed stator coil.
Single Phase
- Rotating field with a single phase to create a phase shift
- 2, 4, 6 pole configurations are common
Rotating Field
- You use an auxiliary coil with a phase lag (capacitor)
- This is a capacitor start induction motor where a single phase is split into two which acts roughly like a 2 phase motor but only uses one phase