| 摘要 |
A rotor for an electric motor with a spherical surface consists of a ring of soft iron and a squirrel cage made preferably from copper. The squirrel cage consists of copper bars lying in spiral grooves and a cooper ring on each axial end of the iron ring, short-circuiting all bars. The pole segments between the grooves do not have pole shoes. A cap made of ferro-magnetic metal covers the windings and acts magnetically in the same way as pole shoes. The cap surrounds the hollow spaces between the ring and the cap. The squirrel cage will preferably be cast by filling the spaces with molten copper during manufacture.
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