| 摘要 |
In a radial fan wheel for supplying cooling air for an electrical machine, with a number of fan blades ( 16 ) attached along the circumference of the fan wheel ( 10 ) that have arc-shaped blade ends ( 18 ), which, at their radially inner edge, enclose a first angle (beta 1 ) with a tangent ( 20 ) to the inner circumference ( 20 ) of the fan wheel ( 10 ) and at their radially outer edge, enclose a second angle (beta 2 ) with a tangent ( 22 ) to the outer circumference ( 24 ) of the fan wheel ( 10 ), the invention proposes that the second angle (beta 2 ) be selected to be 75% or more greater than the first angle (beta 1 ) in order to minimize the turbulence noise in the vicinity of the fan blades ( 16 ) during operation of the fan wheel ( 10 ).
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