| 摘要 |
PURPOSE:To circulate the refrigerant smoothly and to improve the cooling effect by providing the whole circumferential slot to the central part of the torque tube, by making it communicate with the refrigerant tank through the holes of the central part and by providing a cooling slot to the coil side in the axial direction and a hole in the coil end part. CONSTITUTION:The whole circumferential slot 11 is provided to the central part of the torque tube and is made communicate with the refrigerant tank 6 in the shaft center through the plural holes 9 in the central part of the rotor. Moreover the cooling slot 14 that extends in the axial direction is formed in the slot side of the coil 13, the flow groove 15 is formed in the surface of the shaft at the coil end part, and the hole 5 that communicates with the refrigerant tank 6 is provided in the coil end part. In this way, the refrigerant 7 can be circulated smoothly such that it flows from the hole 9 and returns to the refrigerant tank 6 from the hole 5 through the circumferential slot 11, cooling slot 14 and flow groove 15 as shown by the arrow 10 to improve the cooling effect. |
