| 摘要 |
A rotor conductor upper portion positioned near to an outer periphery of a rotor has a trapezoidal, cross sectional shape, a rotor conductor lower portion positioned nearer to a center of the rotor than the rotor conductor upper portion has a rectangular, cross sectional shape, and the rotor conductor upper portion has a height h 1 =27 mm or more in the case where rotor conductors are made of brass, and a height h 1 =7 mm or more in the case where the rotor conductors are made of copper.
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