Electricity: motive power systems – Synchronous motor systems – Brushless motor closed-loop control
Reexamination Certificate
2009-07-14
2011-10-25
Ip, Paul (Department: 2837)
Electricity: motive power systems
Synchronous motor systems
Brushless motor closed-loop control
C318S400300, C318S400260, C318S400320, C363S069000, C363S132000
Reexamination Certificate
active
08044620
ABSTRACT:
An inverter control circuit controls transistors based on comparison of a voltage command wave with a carrier wave, when a magnitude of a voltage vector is equal to or less than a peak value of the carrier wave. The voltage command wave is a wave, which is offset to a maximum value side from a reference potential of the carrier wave so that a maximum value of the voltage command wave equals a peak value of the carrier wave. The inverter control circuit makes an on-period of the transistor on a positive bus side longer than that of the transistor on a negative bus side by using the command voltage. The amount of electricity charged in a capacitor is reduced in comparison with a case in which the voltage command wave is used. Thus, thermal loss of a stator coil and a diode on the positive bus side is reduced.
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Office Action mailed Jun. 22, 2010 from the Japanese Patent Office in the corresponding JP Patent Application No. 2008-307524 (English translation).
DENSO CORPORATION
Ip Paul
Posz Law Group , PLC
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