| 摘要 |
PURPOSE:To prevent troubles due to heat by forming the device with an iron core and a coil wound around a coil bobbin composed of ceramics. CONSTITUTION:Heat generated in the coil 15 is promptly conducted to the coil bobbin 11 to promote heat dissipation and also to a thermo-sensitive element 17 when the temperature of the coil 15 is raised, by molding the bobbin 11 in ceramics, a kind of good heat conductor. Accordingly, upon an abnormal temperature rise due to heat generation of the coil 15, the element 17 is actuated without delay to stop the flow of electric current in the coil 15 connected in series to the element 17 and lower the temperature of the coil 15. By this, troubles due to heat generation can be prevented. |
