Magnetic flux detection method for rotor position of permanent magnet synchronous motor

According to the magnetic flux detection method for the rotor position of the permanent magnet synchronous motor, when an INFORM method is adopted for rotor position detection, the injection angle of reference voltage is changed, the injected reference voltage is made to exceed a reconstruction unobservable area, and therefore three-phase current can be reconstructed through sampling of a single current sensor on a bus; and finally, the position of the rotor can be calculated on the basis of the current variation, so that the problem that when an INFORM method and a single-current sampling phase current reconstruction method are combined for use, because the injected reference voltage is in a reconstruction unobservable area, the phase current cannot be observed is solved. And a single-current sampling reconstruction phase current method cannot be directly used. 本发明公开了一种永磁同步电机转子位置的磁通检测方法中，采用INFORM方法进行转子位置检测时，改变参考电压的注入角度，使注入的参考电压超出重构不可观测区，从而可以通过母线上的单电流传感器采样来重构三相电流，进而得到三次注入参考电压引起的电流变化量，最后可基于电流变化量计算得到转子的位置，解决INF