Power converter apparatus
AssigneeMitsubishi Denki Kabushiki
InventorHiroshi Araki
Life of this patent
Estimating the term…
Abstract
A power converter apparatus includes a control mechanism for sampling input signals at a sampling frequency and generating an alternating current control voltage in response and for generating a two-axis voltage command. A phase correcting mechanism operating at a second frequency higher than the sampling frequency is provided for correcting the phase of the control voltage at the second frequency. A coordinate converting mechanism converts the voltage command into a multi-phase voltage command in response to the phase of the voltage after the phase correction by the phase correcting mechanism.
Claims4
A power converter apparatus comprising:
- control means for sampling input signals at a sampling frequency and generating an alternating current control voltage having a phase .theta. and a two-axis voltage command in response to the sampling;
- phase correcting means operating at a second frequency higher than the sampling frequency for correcting the phase of the control voltage to .theta.+.omega.1/f.sub.k, where .theta.1 represents the frequency of the control voltage and f.sub.k represents the frequency of a carrier wave, at the second frequency to generate a corrected control voltage;
- and
- coordinate converting means connected to the phase correcting means and the control means for converting the two-axis voltage command into a multi-phase voltage command responsive to the phase of the corrected control voltage.
A power converter apparatus comprising:
- a power converter for converting direct current into an alternating current in response to a multi-phase voltage command;
- an induction motor driven by the alternating current and having an angular velocity determined by the alternating current;
- a control mechanism sampling at least one of the angular velocity and the alternating current at a sampling frequency and generating an alternating current control voltage having a phase .theta. and a two-axis voltage command in response to the sampling;
- phase correcting means operating at a second frequency higher than the sampling frequency for correcting the phase of the control voltage to .theta.+.omega.1/f.sub.k, where .theta.1 represents the frequency of the control voltage and f.sub.k represents the frequency of a carrier wave, at the second frequency to generate a corrected control voltage;
- and
- coordinate converting means connected to the control mechanism and the phase correcting means for converting the voltage command into the multi-phase voltage command in response to the phase of the corrected control voltage.
Dependencies are inferred from the claim text.