Yea, sorry. i do appreciate the intel but i should have used English. i said synchronous and Asynchronous. The best way to understand it in the real world is an AC motor versus a DC motor. The torque curves are polar opposites. The DC motor creates an electromagnetic field that is synchronized to the rotor of the motor and can be very dynamic but typically has a low rotor inertia so its better for full stop and start. An Asynchronous motor has a higher rotor inertia and the pulses that rotate the rotor maybe faster or slower than the poles on the motor. (Slip)