A. 已知電機的輸出扭矩，求取該扭矩下的電機對應N，I，P，η值。

 在橫坐標中找到對應扭矩的位置點，做一垂直線，找出該線同四條函數線的交點，并分別做水平線與對應的參數縱坐標相交，即可得到相對應的參數值。

B.  在已知N，I，P，η四個參數中的任何一值，求取其它參數的方法。

以已知N值為例，可以先在N的縱坐標中找到對應的數值點，做一水平線同N=f(T)線相交，找出交點，過此交點做垂直線，該線同其它特性線及橫坐標相交，同橫坐標相交的點就是對應的扭矩值，過同其它特性線的交點做水平線，找到對應的縱坐標就可以得到對應的參數。

A. With a known output torsion of the motor , strike a corresponding N I P η value under this torsion. 

Finds the corresponding torsion position in the abscissa , do a vertical line to identify the intersect ions of this line with four function lines.  Respectively do the horizontal line to intersect longitudinal coordinates of the corresponding parameters.  Then parameter values can be received right away.

B. Know any value of the 4 parameters of N  I  P η strike other parameters.

Take know value N as an example , First , corresponding numerical point can be found in the longitudinal coordinates of N.  Do a horizontal line intersecting the N=f(T) lines, to identify intersect ion, and pass it to make the vertical line.  It crosses with other characteristic lines and abscissa and the intersection of the line with the abscissa is the corresponding torsion value.  Do the horizontal lines passing other intersections of characteristic line, finding corresponding longitudinal coordinates.  The corresponding parameters can be obtained.