| 摘要 |
Current control circuit controls an output voltage of DC power supply so as to increase current passing through inverter circuit as the motor increases its the speed. The control offers an RPM-torque characteristic of the motor in which torque increases as the RPM increases. By virtue of the RPM-torque characteristic, a ventilating device employing brushless DC motor exhibits preferable air quantity-static pressure characteristic where less change in air quantity is expected even when a pressure loss-outside wind pressure, duct length or the like-varies.
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