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Title:
AC MOTOR DECELERATING METHOD AND INVERTER
Document Type and Number:
WIPO Patent Application WO/2005/096489
Kind Code:
A1
Abstract:
An AC motor can be decelerated in as a short time as possible by means of an inverter and the current is controlled below a predetermined value so that the inverter does not stop because of an overcurrent or the AC motor does not fail due to burnout even if the AC motor is liable to be magnetically saturated. A method and device for driving an AC motor by means of a voltage inverter having therein a voltage correcting section for correcting a given voltage command by using the value obtained by passing a DC bus voltage detected value through a primary delay filter. The AC motor is decelerated in an overexcited state by increasing the time constant of the primary delay filter above the time constant in the normal control state. The current flowing through the AC motor is monitored and the time constant is adjusted according to the current flowing through the AC motor. Therefore, the AC motor is decelerated without causing a failure and the deceleration time can be shortened.

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Inventors:
Iura, Hideaki c/o KABUSHIKI KAISHA YASKAWA DENKI 2-1 (Kurosaki-shiroishi Yahatanishi-k, Kitakyushu-shi Fukuoka 04, 80600, JP)
Hiramatsu, Kazuhiko c/o KABUSHIKI KAISHA YASKAWA DENKI 2-1 (Kurosaki-shiroishi Yahatanishi-k, Kitakyushu-shi Fukuoka 04, 80600, JP)
Sawamura, Mitsujiro c/o KABUSHIKI KAISHA YASKAWA DENKI 2-1 (Kurosaki-shiroishi Yahatanishi-k, Kitakyushu-shi Fukuoka 04, 80600, JP)
Application Number:
PCT/JP2005/005704
Publication Date:
October 13, 2005
Filing Date:
March 28, 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-k, Kitakyushu-shi Fukuoka 04, 80600, JP)
Hiramatsu, Kazuhiko c/o KABUSHIKI KAISHA YASKAWA DENKI 2-1 (Kurosaki-shiroishi Yahatanishi-k, Kitakyushu-shi Fukuoka 04, 80600, JP)
Sawamura, Mitsujiro c/o KABUSHIKI KAISHA YASKAWA DENKI 2-1 (Kurosaki-shiroishi Yahatanishi-k, Kitakyushu-shi Fukuoka 04, 80600, JP)
International Classes:
H02P3/18; H02P21/36; H02P23/20; H02P27/06; H02P27/08; (IPC1-7): H02P3/18; H02P7/63
Foreign References:
JPH077981A1995-01-10
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