| 摘要 |
There is disclosed a motor speed control system particularly applicable to control sewing machine operation, including an evaluator to compare a preset speed of revolution value and an actual speed of revolution value to output one signal representing a deviation between the two speeds and the other representing a rate of increase or decrease of the actual speed of revolution within a predetermined short interval. In response to these parameter signals, one of the stored fuzzy rules is selectively applied to output an appropriate control signal to change electric power supplied to a motor as needed to adjust the speed of revolution toward the preset revolution with quick responsivity and smooth transition.
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