ROTOR POSITION DETECTOR ABNORMALITY DETERMINING DEVICE FOR ELECTRIC MOTOR CONTROL APPARATUS

• Main Authors: KEZUKA NOBUTAKA, KUROZUMI SHOGO
• Format: Patent
• Language: English; Japanese
• Published: 24.11.2016
• Subjects: ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVEREDIN A SINGLE OTHER SUBCLASS; 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; MEASURING; MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR; PHYSICS; TARIFF METERING APPARATUS; TESTING

PROBLEM TO BE SOLVED: To reliably determine any abnormality in information on a rotor position detector 2 due to mechanical vibration, such as vibration resulting from its faulty fitting to a motor 1.SOLUTION: An electric motor control apparatus having a speed control system (a speed calculator 3 and a speed controller 4) that controls speed according to detection information from a rotor position detector 2 and a current control system (a current controller 8) that controls current with the output of a dq converter 6 that converts the three-phase detection current of a motor 1 into a d-q axis with reference to the detection information from the detector 2 is further equipped with a harmonic detector 11 that extracts from a d-axis current Id a vibration component Id_h of the d-axis current Id obtained by the dq converter 6, and an encoder information abnormality determining unit 12 that determines whether or not the vibration component of the d-axis current extracted by the harmonic detector 11 is caused by any mechanical factor and, if it is, determines that, when the vibration component remains for a set length of time or longer, the detection information from the rotor position detector 2 is abnormal.SELECTED DRAWING: Figure 1 【課題】機械的振動、例えばモータ１への取り付け不具合により発生した振動によって回転子位置検出器２の情報が異常となっていることを確実に判定する。【解決手段】回転子位置検出器２の検出情報により速度を制御する速度制御系（速度演算部３、速度制御部４）と、前記検出器２の検出情報を基準としてモータ１の三相検出電流をｄ−ｑ軸に変換するｄｑ変換部６の出力によって電流を制御する電流制御系（電流制御部８）とを備えた電動機制御装置において、ｄｑ変換部６で得られたｄ軸電流Ｉｄから、ｄ軸電流の振動成分Ｉｄ＿ｈを抽出する高調波検出部１１と、高調波検出部１１によって抽出されたｄ軸電流の振動成分が機械的要因で起こる振動であるか否かを判定し、機械的要因で起こる振動である場合に、その振動成分が設定時間以上継続したときに、回転子位置検出器２の検出情報が異常であると判定するエンコーダ情報異常判定部１２と、を備えた。【選択図】図１