| 摘要 |
PURPOSE:To permit the continuous control of the opening and/or closing condition of a damper by a method wherein the opening degree of an opening and closing plate by controlling the conduction of current to a motor, is detected to adjust it continuously at an arbitrary opening degree in accordance with a temperature difference between a set inside temperature of a refrigerator. CONSTITUTION:A motor 6 drives an opening and closing plate 3 through a rotary body 20. A position detecting means 19 outputs a resistance in accordance with the opening degree of the opening and closing plate 3. A resistance detecting means 24 inputs a signal S3 from the position detecting means 19 and detects the total sum of the values of resistances of a resistor band unit 13, a resistor band unit 15 and a resistor band unit 16. A position detecting means 25 inputs a signal from the position detecting means 19 while a position detecting and correcting means 26 inputs a signal S5 from the resistance value detecting means 24. A control means 31, controlling the conduction of a current through a motor 6 through the inputs of signals from an inside temperature detecting means 21, an inside temperature setting means 22, a position detection correcting means 26 and the position detecting means 25, is provided whereby the opening and closing plate 3 can be set at any opening degree continuously. Further, all of the values of resistors are detected sequentially by the position detection correcting means 26 to add correction considering the variety and changes due to deterioration and, then, the opening degree of the opening and closing plate 3 is determined. |
