SPEED CHANGE GEAR MONITORING SYSTEM

• Main Authors: NISHIMURA TAKAMASA, NAGATA KOICHIRO, NAKAMURA AKIHIRO
• Format: Patent
• Language: English; Japanese
• Published: 15.03.2023
• 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; MEASURING; PHYSICS; TESTING; TESTING STATIC OR DYNAMIC BALANCE OF MACHINES ORSTRUCTURES; TESTING STRUCTURES OR APPARATUS NOT OTHERWISE PROVIDED FOR

To provide a speed change gear monitoring system capable of identifying vibration frequency for diagnosing a speed change gear from current information relevant to a motor, which is complex-superposed of mechanical and electrical noises.SOLUTION: The speed change gear monitoring system includes: a diagnostic frequency estimation unit 8 that extracts multiple diagnostic frequency candidate groups from a frequency region separated by a specific frequency Δf or more by using at least current information relevant to a motor 4, transmission gear ratio of a speed change gear 5, and the number of steps of the speed change gear 5, and estimates frequencies that satisfy a specific relationship as diagnostic frequencies out of the frequencies obtained in multiple diagnostic frequency candidate groups; and an abnormal diagnosis unit 15 that diagnoses an abnormal of the speed change gear 5 by using at least one diagnostic frequency estimated by the diagnostic frequency estimation unit 8.SELECTED DRAWING: Figure 1 【課題】機械的及び電気的ノイズが複合的に重畳されたモータに関する電流情報から、変速装置を診断するための振動周波数を特定できるようにする。【解決手段】少なくとも、モータ４に関する電流情報と、変速装置５の変速比と、変速装置５の段数とを用いて、特定周波数Δｆ以上離れた周波数領域から複数の診断周波数候補群を抽出し、複数の診断周波数候補群において得られる周波数の中から特定の関係を満たす周波数を診断周波数として推定する診断周波数推定部８と、診断周波数推定部８により推定された診断周波数を少なくとも１つ用いて、変速装置５の異常を診断する異常診断部１５と、を備える。【選択図】図１