ELECTRIC ROTATING MACHINE, METHOD OF MANUFACTURING ELECTRIC ROTATING MACHINE, AND COMPRESSOR AND METHOD OF MANUFACTURING COMPRESSOR

• Main Authors: BESSHO TOMOHIRO, TAKAHASHI HIROYASU, NAKAMURA HIDEYUKI, KOKUBU SHINOBU
• Format: Patent
• Language: English; Japanese
• Published: 19.04.2018
• Subjects: CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; DYNAMO-ELECTRIC MACHINES; ELECTRICITY; GENERATION

PROBLEM TO BE SOLVED: To obtain an electric rotating machine whose rotor is reliably secured to a shaft and which excels in a performance.SOLUTION: A rotor core 311 includes a core hole formation part 3111 for forming a core hole and a large diameter hole formation part 3112 for forming a large diameter hole whose diameter is larger than that of the core hole, and a pair of end plates 313 include a center hole formation part 3132 for forming a hole whose diameter is larger than that of the core hole and fitted to a shaft 4 with a space therebetween, the rotor core 311 being held from both sides of lamination direction by the end plates 313, with the shaft 4 fitted thereto penetrating the center hole formation parts 3132 of the end plates 313 and the core hole and large diameter formation parts 3111, 3112, the center hole formation parts 3132 being welded to the shaft 4. The concentricity of the shaft 4 and the rotor core 311 is determined by a fitting tolerance of the shaft 4 with the core hole formation part 3111, and a heat flux to the rotor core 311 in which a magnet (not shown) is contained during welding is suppressed by the presence of the large diameter hole formation part 3112 and the performance degradation of the magnet is thereby prevented.SELECTED DRAWING: Figure 4 【課題】回転子がシャフトに確実に固定されるとともに性能の優れた回転電機を得る。【解決手段】回転子鉄心３１１は、鉄心孔を形成する鉄心孔形成部３１１１と鉄心孔よりも径の大きい大径孔を形成する大径孔形成部３１１２とを有し、一対の端板３１３は前記鉄心孔よりも径の大きい孔を形成しシャフト４と隙間を設けて嵌合する中央孔形成部３１３２を有し、回転子鉄心３１１は端板３１３により積層方向両側から挟持され、端板３１３の中央孔形成部３１３２、鉄心孔および大径孔形成部３１１１，３１１２を貫通してシャフト４が嵌合されており、中央孔形成部３１３２がシャフト４に溶接されている。シャフト４と回転子鉄心３１１の同軸度は、シャフト４と鉄心孔形成部３１１１とのはめあい公差で決定され、大径孔形成部３１１２の存在により溶接時の図示しない磁石が収容された回転子鉄心３１１への熱流が抑制され、磁石の性能低下が防止される。【選択図】図４