| 摘要 |
PROBLEM TO BE SOLVED: To provide a blower capable of reducing the decrease in a blast volume without being affected by a current ripple produced by increase in load, even if an external pressure loss, such as an outside wind pressure, increases.SOLUTION: A blower comprises air flow control means 16 that determines that external static pressure of a ventilator 10 increases, load thereof decreases, and a blast volume thereof decreases if a temperature of a switching element detected by switching element temperature detection means 13 is lower than a reference temperature, and then increases output voltage of low DC voltage conversion means 8 to increase a blast volume of a centrifugal type blower 1a. Conversely, it is determined that the load and blast volume increase if the temperature of the switching element is higher than the reference temperature, and then the output voltage of the low DC voltage conversion means 8 is decreased to decrease the blast volume. Thus, it is possible to achieve a blower and an electrical apparatus capable of reducing the decrease in a blast volume without being affected by a current ripple produced by increase in load applied to a brushless DC motor 11 even if an external pressure loss, such as an outside wind pressure, increases. |
