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Rotary Attraction Motor Update
By Peter Lindemann, D.Sc.
April 25, 2007

In the DVD presentation "Electric Motor Secrets", a no Back EMF, Magnetic Attraction Motor, with high torque and high electrical recovery is discussed. Near the end of the presentation, a rotor design called the "S" rotor is shown. In lab tests conducted after the film was finished, it was determined that the "S" rotor is more difficult to fabricate and does not perform better than a simpler design. This design consists of a simple cast iron rotor in the form of two cross bars. I call it the "X" rotor, and the configuration is shown below.

The basic motor configuration is as follows. The stator pole faces describe 30 degrees of arc. Each rotor cross bar face also describes 30 degrees of arc. There are four power strokes per revolution of the shaft. A power stroke begins when one of the cross bars is in the position shown in the illustration.

The commutator turns the power coil ON for 15 degrees of rotation, and then turns the power OFF. The power then remains OFF for 75 degrees of rotation. This cycle repeats every 90 degrees of rotation.

So, the power ON phase draws the cross bar 1/2 of the way into alignment with the stator pole faces. The power coil then turns OFF and discharges its magnetic field during the second half of the way into alignment. By the time full alignment is made, the magnetic field is gone and the iron bar section of the rotor rotates out of alignment with no resistance.

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