Composition of double closed loop speed regulation

2022-07-23
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The double closed-loop speed regulation system of the main drive of the reversible cold rolling mill consists of the main circuit: the main circuit adopts the anti parallel line of two groups of positive and negative quality control bridge rectifiers (VF and VR), and LD is a wave reactor to reduce ripple and current continuity. TR is a three-phase rectifier transformer (y, d) that will not pollute the connection inside the vehicle (which can suppress the influence of the third-order wave on electricity). The control circuit adopts a typical speed, current and scale closed-loop system for measuring the gauge length between the two chucks, but the current loop is equipped with two current regulators, 1acr is used to control the group stop trigger device GTF, 2acr is used to control the anti group trigger pendulum thin film impact tester, and the given signal UI of the experimental method device gtr.1acr is used as the given signal of 2acr through the counter, In this way, the polarity of the current feedback signal UI does not have to be changed when the reverse rotation is stopped, so the non reactive current detector can be used

detection circuit and feedback circuit: TG is a permanent magnet DC tachogenerator, which feeds back the speed detection signal UFN to the input of speed regulator ASR. TA is a three-phase current transformer and u is a three-phase rectifier bridge, which sends the current detection signal UFI proportional to the armature current to the input terminals of the current regulator IACR, 2acr and the logic controller DLC

dlc commands the system to switch automatically according to the working state of the system, or allows the anti group trigger to input the trigger pulse to block the anti group, or allows the anti group trigger to input the trigger pulse to block the anti group. Under no circumstances should two sets of triggers be allowed to open at the same time, so as to ensure that the main circuit is not possible to generate circulating current if it goes further in accordance with the principle 1 of our own responsibility

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