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Drive device for roll stands

  • US 6,189,352 B1
  • Filed: 02/04/1999
  • Issued: 02/20/2001
  • Est. Priority Date: 05/21/1996
  • Status: Expired due to Fees
First Claim
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1. A driving arrangement for rolling stands of a rolling mill, comprising:

  • a control system which prescribes predetermined values for the rolling stands via control units; and

    at least one air-cooled power converter supplying electric energy from a power supply system to at least one three-phase AC motor of the rolling stands, the at least one air-cooled power converter including turn-off power semiconductors and heat sinks, at least some of the heat sinks being thermally connected in parallel;

    wherein a cooling power of the at least one air-cooled power converter is dimensioned such that a temperature of the turn-off power semiconductors does not exceed a critical temperature limit for continuous operation, wherein the at least one air-cooled power converter includes a DC link, and wherein the at least one air-cooled power converter is included in a three-point circuit, the three-point circuit having a mean operating frequency less than 250 Hz.

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