| 摘要 |
PURPOSE:To cool efficiently without influencing magnetic characteristics by a method wherein a suitable thrust duct and radial duct are formed in a rotor and a rotor core and end parts of rotor bars of the side of cooling air exhaust are cooled by the cooling air which flows through the radial duct. CONSTITUTION:A thrust duct 12, which extends from an end surface of a rotor core 2 of a cooling air inlet side to the direction of a core shaft but does not reach an end part of the cooling air exhaust side and ends in the core before that, is formed in the rotor core 2. A radial duct 13 is formed from the end of the thrust duct 12 to the outer circumference of the core along the radial direction of the core in the end part of the core 2 of the cooling air exhaust side. The rotor core 2 and end parts of rotor bars 5 of the side of cooling air exhaust are cooled by the cooling air which flows through the radial duct 13. |
