دانلود مقاله ترجمه شده قابلیت اطمینان درایوهای سرعت قابل تنظیم

ADJUSTABLE SPEED DRIVES (ASDs) are often judged as much less reliable when compared with direct online (DOL) operation of motors. This article discusses that most failures contributing to the (bad) image of ASDs are related to specification and engineering, rather than to the drive itself. As a matter of fact, the usage rate of drives in the chemical industry is far below the usage rate of drives in other industries (3% versus >8%). Because failures with high-voltage (HV) frequency-controlled drives also contribute to the image of low-voltage (LV) drives, an overview is given on all types of failures and their possible prevention for LV as well as HV. The rate of possible improvement by implementing proper techniques is given based on a split in failures caused by design versus the drive itself and expressed in mean time between failure (MTBF) figures