| 摘要 |
PURPOSE:To reduce the eddy current loss, by making an opposite area between annular outer projections greater than that between annular inner projections, and thereby reducing the moment increasing inclination of a shaft. CONSTITUTION:An opposite area So between outer projections 17 and 19 is greater than an opposite area Si between inner projections 16 and 18. Therefore, when a shaft 11 is inclined, a quantity of change DELTAdeltao in air gap deltao between the outer projections 17 and 19 becomes greater than a quantity of change DELTAdeltai in air gap deltai between the inner projections 16 and 18. Further, a partial force of an attraction force Fo applied to a rotor disc 10 becomes ununiform, a rate of which is greater than a rate of ununiformity of a partial force of an attraction force Fi at the inner projection 18. Accordingly, a moment increasing inclination of the shaft 11 is reduced to thereby eliminate an eddy current loss due to the inclination.
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