This paper presents the basic principle of the inverter,analyses the load characteristics of the food mixers,the demand of the inverter and its goods in the application.

Aimed at the high-frequency vibration question of hydraulic system for the 2×6 m3 forced concrete mixer used in longtan hydraulic power station, two additional electrical motor-hydraulic pump sets were used, the characteristic curve between the variable pump displacement and output pressure was varried, so that the high -frequency vibration of hydranlic system was eliminated.