POWER CONVERSION APPARATUS

Title:

POWER CONVERSION APPARATUS

Document Type and Number:

WIPO Patent Application WO/2012/098628

Kind Code:

A1

Abstract:

A power conversion apparatus is provided with a conversion unit (20) that converts power coming from the side of an AC power-supply (6) into AC power having a prescribed frequency, using the switching functions of a plurality of switching elements (Sr, Ss, St, Su, Sv, Sw, Sx, Sy, Sz), and outputs the converted AC power to a motor (5). The power conversion apparatus is also provided with a control unit (40) that conducts a torque-control operation such that the output torque of the motor (5) will include therein a power-supply pulsating component, which is a pulsating component having a frequency that is an integer multiple of the frequency of the output of the AC power-supply (6), and such that the output torque will fluctuate in accordance with fluctuations in the load-torque of the motor (5). The control unit (40) also obtains the peak current value when the timings of the peak of the power-supply pulsating component and the peak of the fluctuating component of the load-torque coincide or roughly coincide, and reduces the fluctuating range of the output torque so that the peak current value will not exceed a prescribed upper-limit value.

Inventors:

OGAWA TAKUROU (JP)
SEKIMOTO MORIMITSU (JP)

Application Number:

PCT/JP2011/007364

Publication Date:

July 26, 2012

Filing Date:

December 28, 2011

Export Citation:

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Assignee:

DAIKIN IND LTD (JP)
OGAWA TAKUROU (JP)
SEKIMOTO MORIMITSU (JP)

International Classes:

H02M7/48; H02P6/06; H02P6/08; H02P6/10; H02P6/16; H02P6/28; H02P21/05; H02P21/22; H02P23/04; H02P27/06; H02P27/08

Foreign References:

JP2008061409A	2008-03-13
JP2007028793A	2007-02-01
JPH10150777A	1998-06-02
JP2005046000A	2005-02-17
JP2002051589A	2002-02-15
JP4192979B2	2008-12-10

Other References: