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In this paper, a new linear magnetic gear with multiple gear ratios is proposed. Unlike the conventional linear magnetic gears, the proposed one purposely utilizes the aluminum-nickel-cobalt (AlNiCo) permanent magnets (PMs) as the excitation source. Due to the relatively low coercivity, AlNiCo PMs can be magnetized or demagnetized by applying an appropriate DC current pulse into the magnetizing winding...
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