Title:
POWER CONVERSION DEVICE AND POWER CONVERSION METHOD
Document Type and Number:
WIPO Patent Application WO/2015/045529
Kind Code:
A1
Abstract:
Provided is a power conversion device that can be restarted by estimating the rotor position and frequency during idling when current does not flow when a coil is short-circuited during idling of an AC electric motor and also when a rotation frequency is low.
The power conversion device comprises: a power converter equipped with semiconductor switching elements, converting a DC voltage to an arbitrary voltage by the combinations of the on/off states of the semiconductor switching elements, and driving an AC electric motor; a control device for controlling the semiconductor switching elements of the power converter and performing control so that the arbitrary voltage is supplied from the power converter to the AC electric motor; and a current detector for detecting or estimating the current flowing through the AC electric motor. The control device applies the arbitrary voltage from the power converter to the AC electric motor when the AC electric motor idles or stops, derives the induced voltage frequency/phase of the AC electric motor on the basis of the current flowing through the AC electric motor and the time during which the voltage is applied, and uses the derived induced voltage frequency/phase to restart the AC electric motor.
More Like This:
| JP5805118 | Power converter |
| JPH09191660 | POWER CONVERTER |
| WO/2021/199670 | BUSBAR FOR CAPACITOR ELEMENT, CAPACITOR, AND POWER CONVERSION DEVICE |
Inventors:
SUGIMOTO TAKUYA (JP)
ONUMA YUSAKU (JP)
HOTTA KAZUSHIGE (JP)
ARAO YUSUKE (JP)
ONUMA YUSAKU (JP)
HOTTA KAZUSHIGE (JP)
ARAO YUSUKE (JP)
Application Number:
PCT/JP2014/066759
Publication Date:
April 02, 2015
Filing Date:
June 25, 2014
Export Citation:
Assignee:
HITACHI IND EQUIPMENT SYS (JP)
International Classes:
H02M7/48; H02P6/06; H02P6/08; H02P6/18; H02P6/182; H02P6/28; H02P21/00; H02P21/04; H02P21/14; H02P21/18; H02P21/22; H02P21/24; H02P21/32; H02P21/34; H02P21/36; H02P23/03; H02P23/14; H02P27/06
Foreign References:
| JP2003259699A | 2003-09-12 | |||
| JP2012178900A | 2012-09-13 | |||
| JP2005261052A | 2005-09-22 | |||
| JPH11346500A | 1999-12-14 | |||
| JP2004040986A | 2004-02-05 |
Attorney, Agent or Firm:
INOUE Manabu et al. (JP)
Manabu Inoue (JP)
Manabu Inoue (JP)
Download PDF:
Previous Patent: HIGH-SPEED-TOOL STEEL AND METHOD FOR PRODUCING SAME
Next Patent: POWER CONVERSION DEVICE AND CONTROL METHOD
Next Patent: POWER CONVERSION DEVICE AND CONTROL METHOD