| 摘要 |
PROBLEM TO BE SOLVED: To improve the suction performance of an electric blower by controlling its number of revolutions; and to improve the service life of a motor by protecting it from the failure due to the overheat of a motor etc. without detecting the load current of an electric blower. SOLUTION: The inverter control vacuum cleaner, provided with a control means 18 for controlling a PWM drive means 16, calculates the dirt content of the vacuum cleaner from the duty ratio of a PWM control, and controls the electric blower 2. COPYRIGHT: (C)2011,JPO&INPIT |
