| 摘要 |
PURPOSE:To restrict the temperature rise of a coil by winding a pipeline for cooling around the coil for driving. CONSTITUTION:When a plurality of coils 2 is conducted while switching current, a movable piece 1 obtains a thrust and moves into the direction of linear motion. In this case, heat due to Joule's heat is generated in the coil 2 while the heat is transferred to fluid 10, flowing through the pipeline 3. The fluid 10, whose temperature has been risen by the transfer of the heat generated in the coil 2, is transported to a cooler 7 by a pump 6 through the pipeline 3. The cooler 7 deprives heat from the fluid 10, whose temperature has been risen, and the temperature of the fluid is reduced to a predetermined temperature. The predetermined temperature is determined by a control unit 9 based on the temperature of the coil 2, which is detected by a temperature sensor 8. The fluid 10, whose temperature is controlled at the predetermined temperature, is transported to the coil 2 again by the pump 6 through the pipeline 3. Accordingly, the temperature rise of the coil 2 may be restricted and a constant temperature may be maintained.
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