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4. (4) T. Kominami and Y. Fujimoto: “Magnetic Levitatio Control and Spiral-Linear Transformation System for Spiral Motor”, IEEE Int. Workshop on Advanced Motion Control, Vol. 2, pp. 529-534 (2006)
5. (5) T. Kominami and Y. Fujimoto: “Proposal of a Nine-Switch Inverter That Can Independently Control Two PM Motors”, IEEJ Industry Applications Society Conference, 1-8 (2006) (in Japanese)