Referring first to the equation of the shunt motor shows that the downwards slop of the speed/torque curve is directly proportional to the armature resistance with constant flux and voltage.

• 并励电动机（机械特性）方程表明：若磁通和电压恒定，则向下倾斜的转矩/速度曲线的斜率是直接与电枢电阻成正比的。