John C. Bedini’s Zero Force Motor

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This is a small Tribute to John C. Bedini. In this Zero Force Motor the rotor is utilizing both poles of the coil. The magnets are much too big for this configuration and so much smaller magnets are needed, similar to what the Adam’s motor main function does, which is to obtain the fastest possible ON/OFF switching times with the smallest amount of magnetic field.

The magnets being too big have two main disadvantages. One: You want to eliminate as much rotor magnetic field as possible because this interferes with the output of the collapsing magnetic field and it’s this field we want to get as much back out as possible. The rotor fields causes the coil’s inductance to constantly change and pull to much power from the power supply.

Two: If the magnets are too big and there is too much field, then there is too much back EMF. While this is good for pushing the input power down as the rotor speeds up, this isn’t so good for raising the amount of collapsing field energy returning from the coil.

All in all, get rid of the rotor fields! By doing this then all that is left is a pulsing coil in which the collapsing field is free to return most of the energy back to the supply, or a load or whatever you choose to do with it. The only disadvantage to this is a smaller torque.

Since there will always be magnetic fields, no matter how small, there will always be interference of the collapsing field. Another choice would be a reluctance motor in which the rotor is nothing but iron pole pieces. So a good combination of torque, rotor magnet size and is quite possible.
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