Table 5: Orthogonal experiment results at the rated rotational speed ( r/min).

Number0.81.01.2

(1)34.5234.9235.45
(2)30.8931.4631.13
(3)29.6330.3930.22
(4)35.8036.3237.26
(5)25.3026.9127.77
(6)37.8739.1038.98
(7)31.6932.7432.94
(8)34.5835.4635.36
(9)34.6135.3035.22
(10)29.9630.4630.46
(11)28.2329.4829.47
(12)35.6835.8535.19
(13)35.5636.4936.56
(14)37.8139.2739.68
(15)28.1330.3631.32
(16)32.9033.5533.38
(17)34.6435.4236.18
(18)31.3931.7731.58