Electricity: motive power systems – Induction motor systems – Primary circuit control
Patent
1997-02-28
1999-11-23
Ip, Paul
Electricity: motive power systems
Induction motor systems
Primary circuit control
318812, 318139, 363160, H02M 748
Patent
active
059906570
ABSTRACT:
An inverter system providing both an improvement in the voltage utilization factor and a reduction in the switching loss uses a two-phase switching method. In the inverter system, an .alpha.-axis voltage command value; v.sub..alpha.r and a .beta.-axis voltage command value v.sub..beta.r are input to a stop phase selection means. Six sections are judged based on the values v.sub..alpha.r and v.sub..beta.r to select phases for which it is allowable to stop pulse width modulation control in a two-phase switching method. Then, a phase having the largest absolute value of current is selected among the phases for which it is allowable to stop pulse width modulation control using a U-phase current i.sub.u and a V-phase current i.sub.v. This information is a control mode S. Based on these, two-phase switching calculations are performed by a dead-time compensation calculation means and a pulse width modulation generating means. By doing so, the switching loss can be reduced.
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Kaneko Satoru
Katada Hiroshi
Masaki Ryoso
Tajima Fumio
Takamoto Yuusuke
Hitachi , Ltd.
Ip Paul
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