The frequency converter of SB70G series with high-performance vel employs the high performance frequency converter designed by high-precision rotor field orient vector control algorithm. It also adopts power devices of internationally famous brands and dedicated control digital signal processor (DSP) of American TI electrical machine. The converter possesses abundant system functions, stable and reliable operation and fast response, coordinated with multi mode operation and programmable modules, so it can meets with higher application requirements of clients.