Five-phase motor pulse width modulation method and five-phase motor system

The invention provides a five-phase motor pulse width modulation method and a five-phase motor system, and the method comprises the steps: obtaining reference voltage vectors which comprise a fundamental wave reference voltage vector and a third harmonic reference voltage vector; according to the fundamental wave reference voltage vector, determining a sector where the fundamental wave reference voltage vector is located in the fundamental wave space vector sector division graph; selecting a plurality of fundamental voltage vector combinations according to a sector where the fundamental wave reference voltage vector is located; respectively carrying out analog modulation on the reference voltage vector by using the plurality of basic voltage vector combinations to obtain a plurality of groups of corresponding modulation time; and selecting a unique group of feasible solutions from the plurality of groups of modulation time, and selecting a basic voltage vector combination corresponding to the feasible solutio