Electricity: motive power systems – Induction motor systems – Primary circuit control
Reexamination Certificate
2005-01-18
2005-01-18
Leykin, Rita (Department: 2837)
Electricity: motive power systems
Induction motor systems
Primary circuit control
C318S800000, C318S803000, C318S825000, C318S826000, C318S828000
Reexamination Certificate
active
06844700
ABSTRACT:
An inverter apparatus for converting a DC power converted from an input AC power to an output AC power of a variable frequency and a variable electric power to drive an induction motor at a variable speed. The inverter apparatus includes a rectifying unit, a filter capacitor, an inverter unit having an input connected across the filter capacitor, an input current detector and a gate circuitry for driving the inverter unit. An excitation current detection unit detects an excitation current of the induction motor from an output signal of the input current detector, a gate signal for driving the gate circuitry and a reference phase command. A setting unit sets a limitation level of the excitation current, a torque boost voltage command unit produces a torque boost voltage command, and a torque boost voltage compensation unit changes the torque boost voltage command so that the detected excitation current value is smaller than or equal to the limitation level.
REFERENCES:
patent: 3860858 (1975-01-01), Nola
patent: 4230979 (1980-10-01), Espelage et al.
patent: 4281276 (1981-07-01), Cutler et al.
patent: 4314190 (1982-02-01), Walker et al.
patent: 4469997 (1984-09-01), Curtiss et al.
patent: 4525660 (1985-06-01), Katto
patent: 4780658 (1988-10-01), Koyama
patent: 5481168 (1996-01-01), Mutoh et al.
patent: 5821727 (1998-10-01), Yura
patent: 6194856 (2001-02-01), Kobayashi et al.
patent: 6194864 (2001-02-01), Kinpara et al.
patent: 6229718 (2001-05-01), Nilssen et al.
patent: 6377018 (2002-04-01), Tajima et al.
patent: 6496397 (2002-12-01), Sakai et al.
patent: 7-163188 (1995-06-01), None
patent: 2001-314090 (2001-11-01), None
Furukawa Teiichi
Kato Junji
Nakatsu Kinya
Okuyama Toshiaki
Sakai Keijiro
Antonelli Terry Stout & Kraus LLP
Hitachi , Ltd.
Leykin Rita
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