Control apparatus for three-phase rotary machine
AssigneeDenso Corporation
InventorTakashi Suzuki
Life of this patent
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Abstract
An ECU having two inverters outputs AC currents, which have the same amplitude and a phase difference of 30°. When motor magnetic fluxes include distortion component of fifth harmonic, a torque ripple of sixth harmonic is generated in a torque of each drive system. The torque ripples of sixth harmonic are cancelled out in a sum of torques of the two drive systems. A fifth harmonic current having a frequency of fivefold are superimposed on base components of currents so that peak values of the base wave currents are reduced. As a result, heat generation arising from current peak values can be reduced.
Claims6
A control apparatus for controlling driving of a three-phase rotary machine having two three-phase winding sets, the control apparatus comprising:
- two drive systems of power converters provided in correspondence to the two three-phase winding sets to output AC currents to the two three-phase winding sets, the AC currents having same amplitude each other and a phase difference of (30±60×n)° therebetween, with “n” being an integer;
- and
- a controller unit for controlling output of the three-phase rotary machine,
- wherein the controller unit superimposes on a base wave current, which is an AC current and a main component of an output of the three-phase rotary machine, fifth harmonic currents of a frequency of as high as fivefold of the base wave current and of a same amplitude to the two three-phase winding sets, thereby reducing a peak value of the base wave current.
A control apparatus for controlling driving of a three-phase rotary machine having two three-phase winding sets, the control apparatus comprising:
- two drive systems of power converters provided in correspondence to the two three-phase winding sets to output AC currents to the two three-phase winding sets, the AC currents having same amplitude each other and a phase difference of (30±60×n)° therebetween, with “n” being an integer;
- and
- a controller unit for controlling output of the three-phase rotary machine,
- wherein the controller unit superimposes on a base wave current, which is an AC current and a main component of an output of the three-phase rotary machine, a high harmonic current which is equivalent to a sixth harmonic current of a frequency of as high as sixfold of the base wave current in a d-q axis coordinate, thereby reducing a peak value of the base wave current and cancelling out torque ripples caused by the high harmonic currents in relation to the two winding sets.
Dependencies are inferred from the claim text.