Electricity: motive power systems – Induction motor systems – Primary circuit control
Reexamination Certificate
2011-05-24
2011-05-24
Benson, Walter (Department: 2837)
Electricity: motive power systems
Induction motor systems
Primary circuit control
C318S800000, C361S001000, C361S023000
Reexamination Certificate
active
07948205
ABSTRACT:
A multi-phase AC motor driving device in which occurrence of failure is not erroneously determined is provided. In a multi-phase AC motor driving device including an inverter circuit; current detecting resistances Ru, Rv, and Rw, respectively arranged on lower arm of the respective phase of the inverter circuit, for detecting phase current of the motor; and a control portion and a PWM circuit for controlling ON/OFF operation of switching devices of the inverter circuit, the determination on the occurrence of failure based on the current values detected by the current detecting resistances is not made if the ON-duty ratios of the switching devices on the upper arms of the inverter circuit are not smaller than a predetermined value.
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Benson Walter
Chan Kawing
Omron Corporation
Osha & Liang LLP
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