The design and development ofa power circulating rollinl Contact disc machine is descn"bed. Each disc is medlaDially coupled to a Iepamely excited d.c. electtical machine whose armatures are CODDected electtially.When the discs develop ttaaiOD. power circulates by one machine acting as a motor and the other as a generator.In this way conuoUed ttactioo with a ltepleas variation of sliding speed can be m.inftifted between the rol领 discs. TE 73 高速双辊试验机
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