Abstract
This paper introduces the Permanent Magnet Synchronous Motor (PMSM) directional control principle of magnetic field, discusses the space voltage vector modulation (SVPWM) technology principle, put forward a kind of improved tasting start algorithm, showed a kind of answers with eight SCM realizing the programme of technical characteristics, analyzed it in the permanent magnet synchronous motor drive system, the application and the actual test to prove the application method is certain market value.