e(Nt/Ne)        torque_ratio
0       1.748                   ! 쓮gN
0.199   1.596
0.3     1.511
0.4     1.416
0.5     1.321
0.6     1.235
0.7     1.150
0.72    1.131
0.74    1.112
0.759   1.093
0.78    1.074
0.8     1.056
0.819   1.037
0.84    1.017
0.86    0.995
0.88    0.971
0.899   0.998
0.921   0.995
0.94    0.994
0.95    0.994
1       0.994
