After the voltage of power source increases to 72v, the increasing rate of the electromagneticmoment of motor is very small.
当电源电压增至72 V以后，电动机的电磁转矩增大率降至很小。
2
When the voltage of power source changes from 0 to 100V, the electromagneticmoment of motor gradually increases, but its increasing rate decreases gradually.
电源电压从0～100V变化时，电动机的电磁转矩逐渐增大，但增大率逐渐降低。
3
The frequency changing start up process of generating unit actually is a synchronous driving process under the action of electromagneticmoment of the stator and rotor of motor.