Electricity: motive power systems – Induction motor systems – Primary circuit control
Reexamination Certificate
2005-08-02
2005-08-02
Martin, David (Department: 2837)
Electricity: motive power systems
Induction motor systems
Primary circuit control
C318S800000, C318S803000, C318S806000, C318S812000, C318S817000
Reexamination Certificate
active
06924618
ABSTRACT:
An inverter controller for driving a motor includes a rectifier having a reactor, an inverter, a capacitor, a generator which generates a voltage command value for each phase of the motor, a detector which detects a DC voltage between the DC buses of the inverter, a first corrector which calculates a voltage correction coefficient by comparing the DC voltage with a predetermined DC reference voltage, a second corrector which corrects the voltage command value by multiplying the voltage command value and the voltage correction coefficient, a selector which selects either two-phase modulation or three-phase modulation as a modulation type, a computer that computes a carrier frequency, and a pulse width modulation controller which controls a pulse width modulation so that a value of a voltage to be applied to the motor equals to the corrected voltage command value, by using the selected modulation type and the selected carrier frequency.
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Kawaji Mitsuo
Matsushiro Hideo
Sugimoto Tomohiro
Martin David
Matsushita Electric - Industrial Co., Ltd.
Miller Patrick
Wenderoth , Lind & Ponack, L.L.P.
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