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This concept is based around an experiment on how to properly shield or divert the magnetic field - video. The video will help in understanding the basic operating principals and theory of this design. The screwdriver represents the ferromagnetic material on the rotor. Instead of using two magnets as shown in the video, we will use a magnet and an electromagnet in the actual motor.
Rotor:
1.) Rotor with ferromagnetic material. One piece at the top, another piece at the bottom. The ferromagnetic piece facing the coil isn't necessary, but it adds flexibility by allowing slight variations in the design.
Stator:
1.) Magnet/Coil combination, with ferromagnetic material connecting them.
Operation:
1.) Rotor is attracted to stator magnet.
2.) At TDC, coil is energized according to polarity shown in the illustration. Flux from the magnet is diverted through the ferromagnetic material connecting the magnet and coil. This allows the rotor to pass by.
3.) Ferromagnetic material of rotor can't induce an EMF in the stator coil, thus no CEMF or Drag. Ferromagnetic material of rotor isn't attracted to the stator magnet when the coil is energized (similar to the screwdriver not being attracted to the ferromagnetic material when both magnets have opposite polarities).
Please note:
The fine horizontal lines representing the coil, should be vertical. Also, all stator magnets can be at the top, while all stator coils are on the bottom. The illustration has them alternating up/down. This is an alternative variation to allow the magnet/coil pair to be connected to other magnet/coil pairs to utilize both ends of the coils and magnets , which is too complicated for a simple 2D drawing. I have no 3D drawing capabilities whatsoever.
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