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Patent Searching and Data


Title:
INVERTER DEVICE, AND SPEED REDUCING METHOD FOR AC ELECTRIC MOTOR
Document Type and Number:
WIPO Patent Application WO/2006/004037
Kind Code:
A1
Abstract:
An inverter capable of reducing the speed of even an easily magnetically saturable AC electric motor for a short time period without causing any overcurrent. A motor driving frequency is operated with a detected value obtained by passing a DC bus voltage through a first filter portion, and a voltage command is corrected with a detected value passed through a second filter portion. At a speed reducing time, the time constant of the second filter portion is made larger than that of the first filter portion, so that the electric motor is over-excited to cause a loss.

Inventors:
Iura, Hideaki c/o KABUSHIKI KAISHA YASKAWA DENKI 2-1 (Kurosaki-shiroishi Yahatanishi-ku, Kitakyushu-sh, Fukuoka 04, 80600, JP)
Hiramatsu, Kazuhiko c/o KABUSHIKI KAISHA YASKAWA DENKI 2-1 (Kurosaki-shiroishi Yahatanishi-ku, Kitakyushu-sh, Fukuoka 04, 80600, JP)
Application Number:
PCT/JP2005/012199
Publication Date:
January 12, 2006
Filing Date:
July 01, 2005
Export Citation:
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Assignee:
KABUSHIKI KAISHA YASKAWA DENKI (2-1 Kurosaki-shiroishi, Yahatanishi-ku Kitakyushu-sh, Fukuoka 04, 80600, JP)
Iura, Hideaki c/o KABUSHIKI KAISHA YASKAWA DENKI 2-1 (Kurosaki-shiroishi Yahatanishi-ku, Kitakyushu-sh, Fukuoka 04, 80600, JP)
Hiramatsu, Kazuhiko c/o KABUSHIKI KAISHA YASKAWA DENKI 2-1 (Kurosaki-shiroishi Yahatanishi-ku, Kitakyushu-sh, Fukuoka 04, 80600, JP)
International Classes:
H02P3/18; (IPC1-7): H02P3/18
Foreign References:
JPH077981A1995-01-10
JPH05219771A1993-08-27
JP2001095294A2001-04-06
JP2001211680A2001-08-03
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