×

Control apparatus, dual chip inverter and single chip inverter of AC motors

  • US 7,224,133 B2
  • Filed: 02/15/2005
  • Issued: 05/29/2007
  • Est. Priority Date: 03/12/2004
  • Status: Active Grant
First Claim
Patent Images

1. A control apparatus of AC motors, comprising:

  • a second phase signal controller for generating second phase signals so as to make phase differences between first phase signals generated by a first phase signal generator and current polarity signals of an AC motor driven by an inverter generated by a current polarity detector approach zero, on the basis of the phase differences and a command signal depending upon a rotational speed of the AC motor;

    a modulation wave generator for generating a plurality of modulation wave signals on the basis of the command signal depending upon the rotational speed of the AC motor and the second phase signals; and

    a pulse width modulator for comparing the modulation wave signals with a carrier wave signal and thereby conducting pulse width modulation control on the inverter.

View all claims
  • 2 Assignments
Timeline View
Assignment View
    ×
    ×