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求助，由于對HLP--B變頻器不熟，特此請教。       變頻器帶電動機正傳-----遇到工件-----停------電機反 轉  -----把工件拉回來-----再遇阻力再正轉，此過沒有感應器，實現自動正反轉。不知如何實現的？                                                                                                                                                                                                                                                                                                                                                

轉矩模式，扭矩達到一定值后換相？