A novel 3D space vector PWM control method for 3D magnetic property measurement apparatus

This paper presents a novel three-dimension space vector pulse width modulation (3D-SVPWM) control method for the 3D magnetic property measurement apparatus. Arbitrary 3D magnetic flux density can be obtained by carrier-based PWM technique independently in each axis and vector summation of three axis. The proposed 3D-SVPWM which directly obtains 3D flux density is more efficient and lower harmonic flux root meam square(RMS) than carrier-based PWM technique. Core losses in motor supplied by PWM inverter is greatly different from that supplied by ideal sinusoidal power supply. So the magnetic material measurement supplied by PWM inverter is closer to the real engineering situation. Firstly, the tetrahedron-based and cube-based space state vector are proposed and analyzed. Secondly, the SVPWM method is extended from 2D vector space to the 3D vector space. Thirdly, the optimization switching pulse sequence for 3D-SVPWM is researched. At last, the simulation proves that the three-level 3D-SVPWM drive for 3D magnetic property measurement is efficient.