Electricity: motive power systems – Induction motor systems – Primary circuit control
Reexamination Certificate
2006-05-30
2006-05-30
Ip, Paul (Department: 2837)
Electricity: motive power systems
Induction motor systems
Primary circuit control
C318S802000, C318S729000, C318S721000
Reexamination Certificate
active
07053587
ABSTRACT:
An apparatus is provided to control a three-phase AC motor and comprises an inverter and a controller. The inverter powers the motor in response to a three-phase PWM command. The control circuit controls the inverter based on two modulation techniques selectively switched from one the other depending on information indicative of an operation state of the motor. One modulation technique gives the PWM command a first two-phase modulation allowing each phase voltage to be fixed at a predetermined voltage level in turn at intervals of an electrical angle of 2π/3. The other modulation technique gives the PWM command a second two-phase modulation allowing each phase voltage to be fixed at a predetermined voltage in turn at intervals of an electrical angle of π/3. The switchover can be made between the two-phase and three-phase modulations or can be made with consideration of temperature at switching elements.
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Ito Takeshi
Tsuji Hiroya
Ip Paul
Oliff & Berridg,e PLC
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