Space vector modulation method

T.G.H abetler space vector modulation method Shoot a no difference method is applied to the direct torque control is first and foremost by American T.G.H abetler.Is the main idea of this method in the sampling period for a given value of the torque and the acmotortrading.blogspot.com feedback value of the poor.The amplitude and phase of space voltage vector is arbitrary,can through the adjacent two basic voltage vector synthesis.Using the space voltage vector can be calculated for the purpose of torque and flux linkage with no beat.Using Habetler no beat method,theoretically can totally make flux linkage and torque error to zero,thus eliminating the torque ripple,can make up for the shortcomings single phase induction motorof traditional DTC Bang-Bang control,the motor can run under extremely low speed.In addition,the space voltage vector is obtained by no beat control can make the switch frequency relative to the single vector increases significantly and fixed,for reducing harmonic voltage and motor noise is very helpful.But the space voltage vector duration may be greater than the sampling period,suggesting that cannot satisfy no beat flux linkage and torque control.Therefore the author puts forward three steps,first,whether the torque meet no beat,if you don't meet again to see if the magnetic 6v electric motor chain meet no beat,if you still don't meet in accordance with the existing direct torque control vector table to select the next cycle of single voltage vector.So according to Habetler no beat method is the largest amount of calculation has four steps,it will cost a lot of computing resources,is not easy to achieve,in addition to motor parameter in the whole calculation process is bigger,the dependence of this will reduce the robustness of control.