ROTOR FOR ROTARY ELECTRIC MACHINE

• Main Author: OKOCHI TOSHINORI
• Format: Patent
• Language: English; Japanese
• Published: 05.01.2017
• Subjects: CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; DYNAMO-ELECTRIC MACHINES; ELECTRICITY; GENERATION

PROBLEM TO BE SOLVED: To provide a rotor for a rotary electric machine, which is able to efficiently cool the entire rotor.SOLUTION: A rotor 10 for a rotary electric machine 60 comprises a rotor core 12 and a permanent magnet 16 embedded in the rotor core 12, and is supported by a rotary shaft 50. In the rotor core 12, one or more in-core coolant passages are formed, which guide a coolant, supplied from an in-shaft coolant passage 52 formed in the rotary shaft 50, to the outer peripheral end of the rotor core 12 and used for emitting the coolant into a gap G left from a stator 62. In a location on the inner periphery side from the permanent magnet, each in-core coolant passage comprises: a central coolant passage 22 extending in an axial direction; a pair of inner-periphery-side coolant passages 24 provided near both axial ends of the rotor core 12 and allowing communication between the in-shaft coolant passage 52 and the central coolant passage 22; and an outer-periphery-side coolant 26 extending from the approximately axial center of the central coolant passage 22 toward the radial outside and communicating with the gap G. The radially outside end of the central cooling passage 22 has a gradient extending radially outside toward the approximately axial center.SELECTED DRAWING: Figure 2 【課題】ロータ全体を効率的に冷却できる回転電機のロータを提供する。【解決手段】ロータコア１２と、ロータコア１２に埋め込まれた永久磁石１６と、を備え、回転軸５０により支持される回転電機６０のロータ１０であって、ロータコア１２には、回転軸５０内に形成された軸内冷媒路５２から供給された冷媒を当該ロータコア１２の外周端まで導いて、ステータ６２との間のギャップＧに放出する１以上のコア内冷媒路が形成されている。コア内冷媒路は、永久磁石より内周側位置において、軸方向に延びる中央冷媒路２２と、ロータコア１２の軸方向両端近傍に設けられ、軸内冷媒路５２と中央冷媒路２２とを連通する一対の内周側冷媒路２４と、中央冷媒路２２の軸方向略中央から径方向外側に延びてギャップＧに連通する外周側冷媒路２６と、を備え、中央冷媒路２２の径方向外側端部は、軸方向略中央に近づくにつれて径方向外側に進むような勾配を有している。【選択図】図２