Motor drive system control apparatus

摘要

A motor drive system control apparatus includes: a direct current power supply; a three-phase alternating current motor; a first power converter including switching circuits corresponding to each of three phases of the three-phase alternating current motor and a smoothing condenser disposed electrically in parallel with the switching circuits; an estimating device for estimating peak generation timing in which a peak is generated in an inter-terminal voltage VH of the smoothing condenser on the basis of at least one of an operating condition of the three-phase alternating current motor; a switching condition of the switching circuits corresponding to each of the three phases; and a controlling device for controlling a drive condition of the first power converter so the inter-terminal voltage VH (or a VH peak) in the peak generation timing decreases, for a predetermined period from start timing set in a time domain before the estimated peak generation timing.

主权项

1. A motor drive system control apparatus for controlling a motor drive system comprising:
a direct current power supply; a three-phase alternating current motor; and a first power converter disposed between the direct current power supply and the three-phase alternating current motor and including switching circuits corresponding to each of three phases of the three-phase alternating current motor and a smoothing condenser disposed electrically in parallel with the switching circuits, said motor drive system control apparatus comprising:
an estimating device for estimating peak generation timing in which a peak is generated in an inter-terminal voltage VH of the smoothing condenser on the basis of at least one of an operating condition of the three-phase alternating current motor including at least one of an electric current corresponding to each of the three phases and a phase of the three-phase alternating current motor and a switching condition of the switching circuits corresponding to each of the three phases; anda controlling device for controlling a drive condition of the first power converter such that the inter-terminal voltage VH (or a VH peak) in the peak generation timing decreases, for a predetermined period from start timing set in a time domain before the estimated peak generation timing, wherein said estimating device estimates the peak generation timing on the basis of polarity of an electric current corresponding to each of the three phases and switching timing of the switching circuits corresponding to each of the three phases.