Electricity: motive power systems – Induction motor systems – Primary circuit control
Reexamination Certificate
2011-04-19
2011-04-19
Benson, Walter (Department: 2837)
Electricity: motive power systems
Induction motor systems
Primary circuit control
C318S811000, C180S065285
Reexamination Certificate
active
07928686
ABSTRACT:
An electric motor control device includes a direct current power source; an inverter interposed between an electric motor and the direct current power source, the inverter device controlling an exchange of electric power therebetween; an inverter control unit that generates PWM pulses having a duty ratio corresponding to voltage command signals and sends the PWM pulses to the inverter in order to switch the inverter; a frequency changing unit that changes a carrier frequency of the PWM pulses generated by the inverter control unit in a manner corresponding to a frequency control signal; and a motor control unit.
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Fujiwara Isao
Hasegawa Kazuma
Kinugasa Seiichi
Nishimura Keisuke
Oono Yoshinori
Aisin Aw Co. Ltd.
Benson Walter
Colon Eduardo
Oliff & Berridg,e PLC
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