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Apparatus and method for controlling inverter for driving a three-phase motor

  • US 6,911,801 B2
  • Filed: 01/14/2004
  • Issued: 06/28/2005
  • Est. Priority Date: 05/20/2003
  • Status: Expired due to Term
First Claim
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1. An inverter control method for a three-phase motor comprising three first switches connected between each of phase terminals of the three-phase motor and a positive terminal of a DC power of the three-phase motor, and three second switches connected between each of the phases and a negative terminal of the DC power of the three-phase motor, comprising:

  • disposing three maximum phase voltage vectors each having an equivalent angle interval corresponding to maximum values of each phase voltage;

    setting maximum phase voltage vector regions by predetermined angles with respect to each of the maximum phase voltage vectors;

    setting minimum phase voltage vectors corresponding to the maximum phase voltage vectors in between the maximum phase voltage vector regions;

    obtaining a desirable voltage by turning on a first switch and turning off a second switch, both connected to the phase terminal of a corresponding maximum phase voltage in each maximum phase voltage vector region; and

    changing a duty ratio of control signals with respect to the other switches corresponding to the other two phase voltages.

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