ATBECHDEDKESFRGBGRITLILUNLSEMCPTIESILTLVFIROMKCYALJDIM360 - Ver 2.9 (30 Jun 1998) 1620000/0 1990980/00999298EUROPEAN PATENT APPLICATIONA320000906EP99117969.819990916EnEnEn3150889819981105JP20000906200036200005102000197 7D 01H 1/244 A 7H 02H 7/085 BdeRingspinnmaschine mit Individuellen SpindelantriebenenRing spinning machine with individual spindle drivesfrMétier à filer à anneaux avec des dispositif d'entraînement de broches individuels2Kabushiki Kaisha Toyoda Jidoshokki Seisakusho0024348579 350 a/schoToyoda Jidoshokki Seisakusho, Kabushiki Kaisha1, Toyoda-cho 2-chome, Kariya-shiAichi-kenJPTsuboi, MasayoshiK.K.TOYODA Jidoshokki Seisakusho, 2-1, Toyoda-choKariya-shi, Aichi-kenJPShinozaki, YutakaK.K.TOYODA Jidoshokki Seisakusho, 2-1, Toyoda-choKariya-shi, Aichi-kenJPUematsu, TatsuyaK.K.TOYODA Jidoshokki Seisakusho, 2-1, Toyoda-choKariya-shi, Aichi-kenJPOdachi, YasuharuK.K.TOYODA Jidoshokki Seisakusho, 2-1, Toyoda-choKariya-shi, Aichi-kenJPHOFFMANN - EITLE00101511Patent- und Rechtsanwälte Arabellastrasse 481925 MünchenDEATBECHCYDEDKESFIFRGBGRIEITLILUMCNLPTSEALLTLVMKROSI20000906200036

In a spindle driving apparatus for a ring fine spinning machine, a plurality of spindles have dedicated synchronous motors, inverters and control circuits individually connected thereto, and the control circuits are connected to a common dc power supply. Each control circuit outputs a PWM signal to the corresponding inverter, monitors a PWM duty, detects a drastic change in the driving condition of the corresponding spindle as a result of a change in the PWM duty, and stops the corresponding synchronous motor through that inverter.