Patent ID: 6889004

Claim:
A thermal processing system heating a to-be-processed object while rotating the to-be-processed object by a placement part, and supplying a predetermined gas into a processing chamber and performing thermal processing on the to-be-processed object therein, said system comprising: an outer ring part provided outside of said processing chamber, and having a plurality of magnetic poles arranged circumferentially; an inner ring part provided inside of said processing chamber, having a plurality of magnetic poles arranged circumferentially for applying magnetic forces between the magnetic poles of said outer ring part and those of said inner ring part so that said inner ring part follows said outer ring part and rotates therewith; a bearing part provided between said inner ring part and processing chamber; and said placement part rotating together with said inner ring part in said processing chamber, wherein the number of the magnetic poles of said outer ring part and inner ring part is determined such that a torque transmitted to said inner ring part from said outer ring part is larger than a friction torque applied to said inner ring part by said bearing part when said outer ring part is rotated, for an angular difference between said inner ring part and said outer ring part corresponding to a required allowable angular error of the to-be-processed object.