Electricity: motive power systems – Induction motor systems – Primary circuit control
Reexamination Certificate
2011-03-15
2011-03-15
Leykin, Rita (Department: 2837)
Electricity: motive power systems
Induction motor systems
Primary circuit control
C318S803000, C318S727000, C318S400300, C361S056000, C361S055000, C361S057000, C361S100000, C361S095000, C363S055000, C363S034000, C363S123000, C363S125000, C363S131000
Reexamination Certificate
active
07906933
ABSTRACT:
An induction motor drive includes a plurality of inverters, a changeover switch which changes over outputs of the plurality of inverters to be supplied to one induction motor and a changeover controller which controls the changeover switch on the basis of a failure detection signal of one inverter to change over from the one inverter to another inverter to start the other inverter so that the induction motor is driven. The changeover controller includes a frequency/phase detector which always detects a frequency and a phase of a terminal voltage of the induction motor and a starting frequency/phase setting device which controls a frequency and a phase at starting of the other inverter in accordance with detected values of the frequency/phase detector when the failure signal is inputted.
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Miyazaki Koichi
Okamatsu Shigetoshi
Satomi Hirohisa
Tan Daisuke
Antonelli, Terry Stout & Kraus, LLP.
Hitachi , Ltd.
Leykin Rita
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