Dynamical Distribution of Zero Vector of DTC ...

In order to improve the efficiency of the electrical vehicles driving by constant Magnet synchronous motor (PMSM)，the paper applies a space vector modulation strategy for the new dynamic allocation of zero-vector which is aiming at reducing the inverter switching losses; It obtains the switching frequency of power tube in dynamic-state and steady-state basing on speed error, in order to reduce inverter switching losses; It applies the maximum torque/current control method , according to which the flux value was adjusted. The simulation results shows that, comparing with the traditional DTC system，the very method can raise the system efficiency on the premise of keeping in lower speed function.