Considering the completely character of dump trucks pour down materials and increasing labour efficiency,in this paper,It makes Yangtian CXQ3090 Brand dump trucks as an example and has a suitable right movement of the hydraulic pressure oil jar position,in order to realize the purpose of improving maximum lifting angle.

According to coordinate transformation and united torque control theorem, the article gives general analysis on vector control based on the rotor orientation of rare-earth single-phase permanent synchronous motor used in rare-earth air-conditioners compressor, with a control system frame presented.