Impeller for use in cooling dynamoelectric machine
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United States of America Patent
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Oct 31, 2000
Grant Date -
N/A
app pub date -
Jul 23, 1999
filing date -
Jul 28, 1998
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
An impeller used for cooling a dynamoelectric machine such as electric motors includes a disk and a plurality of blades arranged on the disk in a circle at unequal spaces so that a position angle .theta.n of an n-th blade is met by an equation: .theta.n=.theta.n0+.theta.max.times.sin {2.pi..times.m.times.(n-1)/Z} where Z is the number of the blades, .theta.n0 is a position angle defining a position of the n-th blade when the blades the number of which is shown by Z are arranged on the disk at equal spaces where 1.ltoreq.n.ltoreq.Z, .theta.max is a maximum allowable angular difference, and m is a degree of a rotational frequency and takes any integer from 1 to Z-1.
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