Electricity: motive power systems – Induction motor systems – Primary circuit control
Reexamination Certificate
2006-12-12
2006-12-12
Donovan, Lincoln (Department: 2837)
Electricity: motive power systems
Induction motor systems
Primary circuit control
C318S811000, C318S700000, C318S807000, C318S723000
Reexamination Certificate
active
07148651
ABSTRACT:
A method and apparatus for controlling a permanent magnet synchronous motor by accurately detecting 3-phase motor currents from a DC input current in a full voltage range are provided. In the motor control apparatus for detecting the 3-phase motor currents on the basis of the value of the current detected at a DC side of a PWM inverter, when a difference width between PWM pulse signals of two of three phases of the 3-phase PWM inverter which cannot detect the motor currents is not larger than a predetermined value or when the output voltage of the 3-phase PWM inverter is low, the apparatus automatically reduce the carrier frequency of the PWM inverter.
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Endo Tsunehiro
Itou Yoshiki
Shirahama Hidefumi
Tobari Kazuaki
Donovan Lincoln
Hitachi , Ltd.
McCloud Renata
McDermott Will & Emery LLP
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