| 摘要 |
PROBLEM TO BE SOLVED: To provide a fan motor control device which always maintains the proper number of revolutions according to flow passage resistance of an air flow passage. SOLUTION: The number of revolutions of a fan motor 5 is detected by a number of revolution detection means 15, driving current of the fan motor 5 is detected by a driving current detection means 16, and the flow passage resistance of the air flow passage is discriminated by a flow passage resistance discrimination means 17 from the detected values by using a characteristic showing the relation of the number of revolution making the flow passage resistance as a parameter and driving current. Optimum air blow quantity is discriminated by an optimum air blow quantity discrimination means 18 based on combustion quantity of a combustor. An optimum number of revolution is discriminated from the optimum air blow quantity and the flow passage resistance by an optimum number of revolution discrimination means 19 by using a characteristic showing the relation of air blow quantity making the flow passage resistance as the parameter and the number of revolution. The number of revolution of the fan motor 5 is controlled to be the optimum number of revolution by a motor control means 20.
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