We have developed a cell concept drive system, namely, an entire drive system is divided into minimum function cells, which enables to create a just-fit drive system by a suitable combination of these cells. Another advantage of this system is that partial renovation of each cell is possible, which is effective for extending product life. However, one important problem with this system is that some cells are used longer than the other cells, which increase their risk of failure.
In this paper, we discuss how to reduce the above risk from the perspectives of self-detection of failure symptoms and preventing the occurrence of failure from spilling over to the entire drive system, by using an example of DC voltage sensor failure. First, we propose a fault diagnosis method with offline self-checking for DC voltage sensors. Then, we discuss a new control method that enables drive systems to work continuously, even when sensor fault occurs, by using a prediction signal with the other sensors, instead of a fault sensor signal. Finally, the effectiveness of the developed methods is demonstrated experimentally with a prototype drive system.
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