| 摘要 |
<p>A blower apparatus for an electric motor comprises an air cooling fan 15 rotatably mounted on a rotor shaft 7 by a bearing 14, a plurality of pairs of magnets 16a, 6b mounted on the rotor or the fan, and a non-ferrous disk 17 mounted on the fan or the rotor and having an annular flange disposed between the magnet pairs. The fan is driven by the interaction between the magnets and eddy currents induced in the disk flange with an increasing degree of slippage as a function of speed, thereby reducing the noise level generated by the fan. Alternative embodiments are described with reference to Figs. 7 to 9 (not shown). <IMAGE></p> |
