ROTARY ELECTRIC MACHINE ROTOR

• Main Author: USHIDA HIDEHARU
• Format: Patent
• Language: English; Japanese
• Published: 05.09.2016
• Subjects: CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; DYNAMO-ELECTRIC MACHINES; ELECTRICITY; GENERATION

PROBLEM TO BE SOLVED: To ensure high reliability by reducing a stress to a weld position due to a thermal impulse in a rotary electric machine rotor in which a permanent magnet is connected to a rotor core to which a laminate steel plate is fixed by welding.SOLUTION: A weld part 10, in which a code of a coefficient of thermal expansion is reversed to a magnet steel plate 3 and a permanent magnet 4 constructing a rotor core 2 and which is for welding a plural number of magnet steel plates 3 respectively, is formed so as to be continuously extend along a rotational axial direction, and comprises: a first concave groove part 11 recessing to a diameter second direction R2 side to a reference peripheral surface in a first peripheral surface CP1 in a side of a rotation member 5 in a sectional surface form crossing to a rotation axis; a second concave groove part 12 recessing to the diameter second direction R2 side to the reference peripheral surface CR; and a projection state part 13 projecting to a diameter first direction R1 side by being sandwiched between the first concave groove part 11 and the second concave groove part 12 in a peripheral direction C. A top part 14 of the diameter first direction R1 side of the projection part 13 is formed so as to be positioned closer to the diameter second direction R2 side than the reference peripheral surface CR.SELECTED DRAWING: Figure 4 【課題】積層鋼板を溶接により固定したロータコアに永久磁石が接合された回転電機用ロータにおいて、熱衝撃による溶接部位への応力を低減して高い信頼性を確保する。【解決手段】ロータコア２を構成する電磁鋼板３と永久磁石４とは熱膨張係数が逆符号であり、複数枚の電磁鋼板３を互いに溶接するための溶接部１０は、回転軸方向に沿って連続して延びるように形成されると共に、回転軸に直交する断面形状において、回転部材５の側の第一周面ＣＰ１における基準周面ＣＲに対して径第二方向Ｒ２側に窪む第一凹溝部１１と、基準周面ＣＲに対して径第二方向Ｒ２側に窪む第二凹溝部１２と、周方向Ｃにおいて第一凹溝部１１と第二凹溝部１２との間に挟まれて径第一方向Ｒ１側に突出する突状部１３と、を備え、突状部１３の径第一方向Ｒ１側の頂部１４が、基準周面ＣＲよりも径第二方向Ｒ２側に位置するように形成される。【選択図】図４