Apparatus for correcting current value of three-phase electric motor and correcting method
AssigneeFujitsu Ten Limited
InventorNorimitsu Yukumatsu
Life of this patent
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Abstract
An apparatus corrects a current value of a three-phase electric motor including a current detector that detects current of each of three phases including a first phase, a second phase, and a third phase. The apparatus includes a current-value correcting unit. When current of one of the first to third phase is zero-crossing, the current-value correcting unit corrects a current value of at least one of the others of the first to third phases on a basis of a correlation between detection values of the current detectors provided for the others of the first to third phases during a period in which the three-phase electric motor is operating.
Claims9
An apparatus for correcting a current value of a three-phase electric motor including a current detector that detects current of each of three phases including a first phase, a second phase, and a third phase, the apparatus comprising:
- a current-value correcting unit that, when current of one of the first to third phase is zero-crossing, corrects a current value of at least one of the others of the first to third phases on a basis of a correlation between detection values of the current detectors provided for the others of the first to third phases during a period in which the three-phase electric motor is operating.
A method for correcting a current value of a three-phase electric motor including a current detector that detects current of each of three phases including a first phase, a second phase, and a third phase, the method comprising:
- when current of one of the first to third phase is zero-crossing, correcting a current value of at least one of the others of the first to third phases on a basis of a correlation between detection values of the current detectors provided for the others of the first to third phases during a period in which the three-phase electric motor is operating.
An electric-power-steering control apparatus for correcting a current value of a three-phase electric motor including a current detector that detects current of each of three phases including a first phase, a second phase, and a third phase, the apparatus comprising:
- a current-value correcting unit that when current of one of the first to third phase is zero-crossing, corrects a current value of at least one of the others of the first to third phases on a basis of a correlation between detection values of the current detectors provided for the others of the first to third phases during a period in which the three-phase electric motor is operating.
A three-phase electric motor system comprising:
- a three-phase electric motor;
- a current detector that detects current of each of three phases including a first phase, a second phase, and a third phase;
- and
- a current-value correcting unit that, when current of one of the first to third phase is zero-crossing, corrects a current value of at least one of the others of the first to third phases on a basis of a correlation between detection values of the current detectors provided for the others of the first to third phases during a period in which the three-phase electric motor is operating.
Dependencies are inferred from the claim text.