Abstract: Proposed energy-saving setting for drying grain, heating elements made in the form of a flat metal plate that can significantly reduce energy costs. This technology made uniform drying of grain in a wide temperature range which is achieved by changing the frequency and voltage converter. The study describes the theory of motion of grain on the helical surface which is the main working body of the high-frequency induction grain drying machine. Prove change the angle of inclination of forming a helix and its polar radius depending on humidity at the moment when driving on the inside of the radiator helicoid microwave drying.