| 摘要 |
PURPOSE:To aim at miniaturizing a limit switch for detecting a position of an air control door in a vehicle air-conditioning device, and at enhancing the durability thereof, in a temperature regulating servo-motor control device for the air control door, by providing such an arrangement that a servo-motor is stopped in accordance with the inversion of a voltage signal from the limit switch which detects the control door located at a predetermined position. CONSTITUTION:A motor 3 is rotated to move a control door 1 until a movable piece 8 is connected to a HOT side electrode piece 5, and therefore, a high voltage always applied to a terminal 18 is applied to a terminal 19 from which it is applied to a terminal for a drive circuit which is not shown. With this arrangement, the voltage at the input terminal of the drive circuit is turned into a high level while that at the output terminal thereof becomes low. Accordingly, the motor 3 is stopped. Similarly, when the control door is moved to the COOL side so that the movable piece is located at the COOL position, the applied voltage is reversed so that the motor 3 is stopped. With this arrangement it is possible to miniaturize the limit switch and to enhance the durability thereof. |
