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.