MOTOR CONTROL DEVICE AND DC MOTOR CURRENT RIPPLE DETECTION METHOD

• Main Authors: UCHIDA TAKUYA, YANAGIDA YUICHI
• Format: Patent
• Language: English; Japanese
• Published: 31.10.2019
• Subjects: CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORSOR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; ELECTRICITY; GENERATION

To improve detection accuracy of a current ripple component by removing unnecessary ripples caused by aging, etc. from a motor current.SOLUTION: A ripple detection device 10 includes: a current detection unit 11 for outputting a change in an armature current as a voltage change signal; and a first smoothing circuit block 12 for outputting a first smoothing signal S1 by extracting a current ripple component and a noise component from the voltage change signal. The first smoothing circuit block 12 includes: a low-pass filter 23; a first control voltage generation circuit 21 for extracting unnecessary ripple components different from a normal current ripple component; and a first fluctuation component smoothing circuit 22 for obtaining the normal current ripple component by subtracting the unnecessary ripple components from the voltage change signal.SELECTED DRAWING: Figure 5 【課題】経年等によって生じる不要リップルをモータ電流から除去し、電流リップル成分の検出精度の向上を図る。【解決手段】リップル検出装置１０は、電機子電流の変化を電圧変化信号として出力する電流検出部１１と、電圧変化信号から電流リップル成分とノイズ成分を抽出して第１平滑信号Ｓ１を出力する第１平滑回路ブロック１２を有する。第１平滑回路ブロック１２は、ローパスフィルタ２３を備え、正規の電流リップル成分とは異なる不要リップル成分を抽出する第１制御電圧発生回路２１と、電圧変化信号から不要リップル成分を減じ、正規の電流リップル成分を得る第１変動成分平滑回路２２と、を有する。【選択図】図５