| 摘要 |
PURPOSE:To suppess the cost by connecting a PTC element for resistor with a current supply circuit to a motor for driving a blower, applying a voltage from a voltage control part to another PTC element for thermocontroller, followed by heating, and conducting this heat to the PTC element for resistance through adhesives. CONSTITUTION:When an impression voltage is applied from a voltage control part 5 to a PTC element 2 for thermocontroller, it emits heat by itself, and the heat is conducted to another PTC element 1 for resistor through adhesive 6, and the resistance value of the PTC element 1 increases in accordance with the amount of heat conducted, so that the revolving speed of a motor 4 lowers. In case motor 4 rotation stops because of any inconvenience in the current supply circuit for motor and blowing is stopped, there is no cooling by wind any more, and the temp. of the PTC 1 rises to increase the resistance value of itself rapidly to prevent the lock current to continue flowing to the motor 4 to preclude its damage. |
