Drive device for roll stands
First Claim
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.
1 Assignment
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Accused Products
Abstract
A driving arrangement for rolling stands of a rolling mill, is described. The driving arrangement includes a control system which prescribes desired values for the rolling stands via control units, the rolling stands having at least one electric motor which is supplied with electric energy by a power supply system via at least one converter having turn-off power semiconductors. The converter has an air-cooled design. The cooling power is dimensioned such that the temperature of the turn-off power semiconductors does not exceed a critical temperature limit for continuous operation. The converter includes heat sinks which have an optimum design. At least some of the heat sinks are connected thermally in parallel.
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Citations
29 Claims
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1. A driving arrangement for rolling stands of a rolling mill, comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
a blower cooling the turn-off power semiconductors, the blower one of i) feeding one of ambient air and pre-cooled air to the heat sinks, and ii) sucks ambient air through the heat sinks.
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5. The driving arrangement according to claim 1, wherein the at least one air-cooled power converter is a direct converter.
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6. The driving arrangement according to claim 1, wherein the turn-off power semiconductors include gate turn-off thyristors.
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7. The driving arrangement according to claim 1, wherein the turn-off power semiconductors include MOS controlled thyristors.
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8. The driving arrangement according to claim 1, wherein the turn-off power semiconductors include insulated gate bipolar transistors.
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9. The driving arrangement according to claim 1, wherein the turn-off power semiconductors are reverse conducting.
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10. The driving arrangement according to claim 1, wherein the at least one air-cooled power converter operates in a power range of 1 to 20 megawatts with reference to a continuous load.
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11. The driving arrangement according to claim 10, wherein the power range is 2 to 10 megawatts.
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12. The driving arrangement according to claim 1, wherein the at least one air-cooled power converter operates in a power range of 2 to 30 megawatts with reference to an impulse load.
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13. The driving arrangement according to claim 12, wherein the power range is 4 to 20 megawatts.
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14. A driving arrangement for rolling stands of a rolling mill, comprising:
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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, and wherein the at least one air-cooled power converters includes two air-cooled power converters, and wherein the at least one three-phase AC motor is connected to the two air-cooled power converters in tandem, the at least one three-phase AC motor including open windings, the two air-cooled power converters feeding the windings bilaterally and having a mean operating frequency less than 100 Hz. - View Dependent Claims (15, 16)
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17. A driving arrangement for rolling stands of a rolling mill, comprising:
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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 an n-point circuit, wherein n is one of greater than and equal to 5, the n-point circuit having a mean operating frequency less than 250 Hz. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29)
a blower cooling the turn-off power semiconductors, the blower one of i) feeding one of ambient air and pre-cooled air to the heat sinks, and ii) sucks ambient air through the heat sinks.
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21. The driving arrangement according to claim 17, wherein the at least one air-cooled power converter is a direct converter.
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22. The driving arrangement according to claim 17, wherein the turn-off power semiconductors include gate turn-off thyristors.
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23. The driving arrangement according to claim 17, wherein the turn-off power semiconductors include MOS controlled thyristors.
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24. The driving arrangement according to claim 17, wherein the turn-off power semiconductors include insulated gate bipolar transistors.
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25. The driving arrangement according to claim 17, wherein the turn-off power semiconductors are reverse conducting.
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26. The driving arrangement according to claim 17, wherein the at least one air-cooled power converter operates in a power range of 1 to 20 megawatts with reference to a continuous load.
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27. The driving arrangement according to claim 26, wherein the power range is 2 to 10 megawatts.
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28. The driving arrangement according to claim 17, wherein the at least one air-cooled power converter operates in a power range of 2 to 30 megawatts with reference to an impulse load.
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29. The driving arrangement according to claim 28, wherein the power range is 4 to 20 megawatts.
Specification