Hitachi, Ltd.

Kohichi Saito

Kunio Miyashita

Kazuo Tahara

Tsunehiro Endo

Haruo Koharagi

Yoshitaro Ishii

Fumio Jyoraku

Syuji Watanabe

Hisanori Toyoshima

Koujirou Yamashita

Wakichiro Hishi

Method and apparatus for operating a vacuum cleaner in which by detecting a rotational speed of a variable speed fan motor adapted to give a suction force to the cleaner and its change range, the choking state of the filter and the state of the cleaned surface are discriminated, and a speed command of the fan motor is corrected on the basis of the result of the discrimination, and the comfortable cleaning can be performed by the optimum suction force.

Method and apparatus for operating vacuum cleaner

Motor control apparatus for an electric vacuum cleaner

Method and apparatus for operating a vacuum cleaner in which by detecting a rotational speed of a variable speed fan motor adapted to give a suction force to the cleaner and its change range, the choking state of the filter and the state of the cleaner surface are discriminated, and a speed command of the fan motor is corrected on the basis of the result of the discrimination, and the comfortable cleaning can be performed by the optimum suction force.

Growing community of inventors

Kitaibaraki, Japan

Kohichi Saito