| 摘要 |
PROBLEM TO BE SOLVED: To provide a core for rotors and a rotor for motors that are obtained by pressure-forming a mixture of magnetic powder and binder, wherein mechanical strength is ensured to suppress breakage and increase in iron loss and cost reduction is achieved. SOLUTION: A dust core 1 includes a yoke portion 1b having a center hole 1a into which a rotating shaft 2 is press fit, multiple winding barrel bodies 1c that are provided on the outer circumferential surface 1bo of the yoke portion 1b and on which a wire is wound, and tooth portions 1d provided in 1co outside of the winding barrel bodies 1c in the radial direction. The dust core is formed by pressure-forming a mixture of magnetic powder and binder. The yoke portion 1b is set to any of the following temperature distributions and heated and bonded: a first temperature pattern in which temperature is gradually lowered from the inner circumferential surface 1bi to the outer circumferential surface 1bo of the yoke portion 1b in the radial direction; a second temperature pattern in which temperature is lowered stepwise; and a third temperature pattern obtained by combining the first temperature pattern and the second temperature pattern. COPYRIGHT: (C)2011,JPO&INPIT
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