A method of controlling a pair of counter-rotating rollers 14, 16, the method comprises providing an initial reference speed to both the rollers; measuring a first torque relating to the first counter-rotating roller and a second torque relating to the second counter-rotating roller; comparing the first and second torque to create a torque difference; calculating a speed adjustment based on the torque difference; creating an updated reference speed based on the initial reference speed and the speed adjustment; and sending the updated reference speed to the second counter-rotating roller. A controller 12 for controlling rollers in a high-pressure grinding roller machine, each roller is independently controlled by a dedicated variable frequency drive 30a, 30b and a controller operable to control variable frequency drives by assigning a first of the drives as a master drive and a second of the drives as a slave drive and re-assigning the drives in response to a defined criterion are also provided. The method may include the step of smoothing the torque difference prior to calculating the torque difference. The initial reference speed provided may be when there is no material to be ground in a nip therebetween.
Roller controller
20.01.2021
Patent
Elektronische Ressource
Englisch
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