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 (JP)
HIRAMATSU KAZUHIKO (JP)
HIRAMATSU KAZUHIKO (JP)
Application Number:
PCT/JP2005/012199
Publication Date:
January 12, 2006
Filing Date:
July 01, 2005
Export Citation:
Assignee:
YASKAWA DENKI SEISAKUSHO KK (JP)
IURA HIDEAKI (JP)
HIRAMATSU KAZUHIKO (JP)
IURA HIDEAKI (JP)
HIRAMATSU KAZUHIKO (JP)
International Classes:
H02P3/18; (IPC1-7): H02P3/18
Foreign References:
| JPH077981A | 1995-01-10 | |||
| JPH05219771A | 1993-08-27 | |||
| JP2001095294A | 2001-04-06 | |||
| JP2001211680A | 2001-08-03 |
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