| 摘要 |
<p>PROBLEM TO BE SOLVED: To change a rotation speed of a blower fan independently of individual difference and deterioration of a product and a difference in resistance of a blow path.SOLUTION: Control means is provided with a main control circuit 190a outputting a motor control signal Md so as to reach a target rotation speed of a blower fan 20, and a motor drive circuit 190b generating voltage corresponding to the motor control signal Md and supplying the voltage to the blower fan 20. The rotation speed detected by rotation speed detection means 20b is inputted to the main control circuit 190a and the motor drive circuit 190b to control the voltage generated from the motor drive circuit 190b so as to reach the target rotation number. When the heating is terminated, the target rotation speed and a value of the motor control signal Md are stored as a pair. When a heating operation is started next time, in the case that the same rotation speed as the target rotation speed is set, the motor control signal Md stored with the target rotation speed as a pair is outputted to the motor drive circuit 190b.</p> |
