Patent ID: 7138742

Claim:
A rotating machine, comprising: a plurality of laminated electromagnetic steel sheets constituting at least one of a stator and a rotor; and a plurality of permanent joining portions to unite each of the laminated electromagnetic steel sheets to form a corresponding one of the stator and the rotor, the plurality of permanent joining portions being set to be located at positions at which an integration value of a magnetic flux density with respect to a plane enclosed with the permanent joining portions is always zero and wherein the rotor is provided with permanent magnets buried in a direction of a revolution axis of the rotor and with the laminated electromagnetic steel sheets and is constituted by an inner rotor and an outer rotor whose number of pole pairs are different from each other according to a number of the permanent magnets of each of the inner rotor and the outer rotor, the stator is interposed between the inner rotor and the outer rotor and comprises stator teeth, each of the stator teeth being united together, wherein the laminated electromagnetic steel sheets are united to form each of the inner rotor and outer rotor through the permanent joining portions, and the permanent joining portions are disposed at equal intervals in a peripheral direction of each of the inner rotor and the outer rotor with respect to the revolution axis, wherein the permanent joining portions comprise weld portions.