Rare-earth magnets: Making their strong attraction more attractive.
Color advertisement for the General Motor Research Laboratories. The advertisement includes three graphics: an artistic rendering of a motor or magnet cross-section, a photograph of a curved pole magnet, and a graph illustrating the measured magnetization per an applied demagnetizing field for four rare earth compounds to show the flux distribution of rare earth magnets.
The text summarizes General Motors Research Laboratories' investigations of rare earth magnets. Rare earth compounds produce small and strong magnets, which, when used in electric motors, can minimize the size and weight of the motor. General Motors' development of the techniques to redesign conventional motors to accommodate rare earth magnets, including a "practical way of making pole magnets in thin, curved shapes," is discussed.
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General Motors Corporation. “Rare-Earth Magnets: Making Their Strong Attraction More Attractive.” Paper, 1978. Science History Institute. Philadelphia. https://digital.sciencehistory.org/works/a343lkn.
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