1. Induction Motor Action

2. Look at the magnetic fields established by the three phases

3. Look at the zero degree condition The “net” magnetic field is pointing down

4. Look at the 60 degree condition The “net” magnetic field has moved by 60 

5. Look at the 120 degree condition The “net” magnetic field has moved another 60  the “net” field is “rotating” counter-clockwise

6. Squirrel-Cage Rotor

7. Effects of the rotating magnetic field on the rotor Magnetic field rotates at “synchronous” speed, and “cuts” the rotor bars

8. Induced rotor current and flux Flux around the rotor bar must be “clockwise” Bunching occurs at the right side of the bar Rotor moves Counter-Clockwise (CCW)