Motor driving apparatus

Abstract

The invention provides a motor driving apparatus that supplies energy to a motor so that the peak of the input current from a power supply to the motor can also be suppressed when particularly large energy is needed during the second half period of motor acceleration. A motor driving apparatus 1 having a converter 2, which receives AC voltage and converts it to DC power, and an inverter 3, which receives the DC power and converts it to AC power, includes a charge / discharge control circuit 7 and a capacitor 8 connected in parallel to a link section between the converter 2 and the inverter 3, and energy stored in the capacitor C8 is charged and discharged at arbitrary timing by the charge / discharge control circuit 7.

Description

technical field [0001] The present invention relates to a motor drive device, and more particularly to a motor drive device that stores regenerative energy generated during deceleration of a motor in a capacitor and uses it as power running energy during acceleration. Background technique [0002] Fig. 13 is a circuit diagram of a conventional motor drive device. A motor drive device 101 shown in FIG. 13 has a converter 2 , an inverter 3 , a motor 4 , an inverter control circuit 5 , and a smoothing capacitor 6 . In FIG. 13 , 109 denotes a converter output current, 110 denotes a converter input current, 111 denotes a DC link current (DC link current), 112 denotes a capacitor output current, and 113 denotes a DC link voltage (capacitor voltage). Regarding symbols 110~113, use them later Figure 14 The simulation results of the respective waveforms at the time of operation of the motor drive device 101 shown in FIG. 13 will be described. [0003] The AC power is supplied to t...

AI Technical Summary

Problems solved by technology

[0014] As can be seen from the above, there is the following problem in the motor drive device of the prior art: the electric energy charged in the capacitor cannot be used where it is necessary to provide power to the main motor 4 according to the mechanical requirements, but can be used where it is not needed. , the electric energy charged in the capacitor 6 cannot be effectively used in the motor drive device

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