| 摘要 |
PURPOSE:To prevent an insufficiency of a predetermined torque value due to a frictional damage, an increase in lubricity, etc., in a contact surface with a rotor by immersing a low melting point material in a cavity generated on the surface of a material sintered after power material is pressure molded. CONSTITUTION:A stator of an ultrasonic motor is formed of a sintered material representatively of an iron material containing stainless steel, copper material including brass, bronze material in such a manner that a low melting point material has a lower melting point than that of the sintered material itself, copper, tin, or lead material is used as the iron sintered material and tin or lead terminal is used as the copper material. Immersing material is immersed into cavities of the sintered material to eliminate residue in the cavities of the stator made of the sintered material, and only the immersed material is melted and immersed to the sintered material without remelting the sintered material. Thus, its thermal conductivity is improved to improve cooling properties, its temperature rise at the time of rotation of the motor is suppressed, and even if it is operated continuously for a long period, a predetermined torque value is obtained. |
