This study proposes a novel magnetic circuit topology of a three-phase electromagnetic pump for use in molten aluminum lifting applications. Typically, annular linear induction type magnetic circuits are widely adopted, and they have structures wherein comb-shaped yokes are inserted into the annular coil from the outer diameter side. The proposed novel magnetic circuit employs a flux transverse structure in which the annular coil is sandwiched between both sides of claw pole iron cores. The large number of claw poles intentionally generate harmonic flux in the airgap between iron cores and work to increase an eddy current in the conductive liquid. First, the principle and advantages of the proposed circuit are described based on electromagnetic field analysis. Next, the structural design and prototype are presented. Finally, the result of the principle verification by the alternative equipment using the aluminum pipe is reported.
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