The Keys * Key: The N-S polarity of the cylindrical rotor magnets is top to bottom, while the N-S polarity of the same-shaped stator magnets is front to back. Key: N faces outward in the rotors. The N end of the stator magnet is on the trailing end in the direction of rotation, so that the like-polarity repulsion is the last thing the individual rotor magnet sees as it passes by. * Key: The spacing between the rotor magnets, from the leading edge of one to the trailing edge of the next, should be 1/2x the diameter of the magnet. * Key: The spacing between the stator magnets, from the leading edge of one to the trailing edge of the next, should be 1x or more of the diameter of the magnet. * Key: The rotor and stator magnets need to be the same size. * Robert prefers 1" diam. x 1" inch length neodymium magnets, but says the design is scalable according to the above formula. He recommends not going bellow 7/8 inch diameter, but "it may still work with using smaller magnets". Also, he said that the length of the magnet is not critical. * Key: For shielding, he uses regular steel conduit, cut to the length of the magnet. * Key: To achieve additional torque, he said one can add shielding to the leading edge of the rotor magnet (he did not elaborate shape or position). * Key: He says, "Shields around the rotor magnets can be used to keep from stressing the magnet fields while being so close together; but they are not necessary for it to run. No shields are needed in the stator." * Key: The number of rotor magnets should be a multiples of three (scalable). * Perendev: Based on what he saw on the Perendev, he calculated the angle of the magnets in the rotor and the stator to be 18o from 90o from tangent. He uses 25o, but says 18o will work. There are three rotors and three stators. He did not say how far apart these rotor-stator sets should be from each other. The rotors share a common shaft. The rotors are offset from one another by an equal amount, so that the advancing distance from rotor 1 to 2 to 3 and back to 1 is equal. The placement of magnets in the three stators is uniform from one stator to the next. In the Perendev model, the stators open and close in a clam-shell arrangement (which puts limits on the placement of magnets about the stator where you want them). In PerenTech's 1/4-scale variant, the stators slide in from the side, and do not have an articulating point (as is found in the clam-shell).
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