異步電動(dòng)機(jī)矢量控制調(diào)速系統(tǒng)設(shè)計(jì)外文翻譯、中英對(duì)照、英漢互譯(編輯修改稿)
2024-09-02 18:40 本頁(yè)面
【文章內(nèi)容簡(jiǎn)介】 inverter, the capacitor’s utilization is of high level.4) Current inverter and the load motor form a whole, and the energy storage of the motor windings is also involved in the converter, and less dependent on the voltage inverter, so it has a certain load capacity. Inverter SCR trigger drive circuitThe Inverter SCR trigger drive circuit as shown in Figure 4. Inverter trigger signal is controlled by P1 of 80C196, slip signal outputting through P1 via PWM regulation in the SCM through the photoelectric isolation to enlarge, to control the trigger of the inverter. The system uses as control and uses ~ to control six SCR inverters separately, so the trigger circuits is posed by six circuits above.The principles of drive circuit of SCR trigger inverter are as follows: when the PWM from P1 is high signal after and gate, photoelectric isolation is not on, posite pipe in a state of onsaturated, the left side of the transformer forming circuit, and that the power of the signal amplifies (current enlarges)。 when the PWM from P1 is low signal after and gate, photoelectric isolation is on, posite pipe in a state of cutoff, and the left side of the transformer can not form circuit。 thus, posite pipe equivalent to a switch, and its frequency relied on the frequency of the PWM, so the left side of the transformer form AC signals, to trigger SCR inverter after transformer depression, halfwave rectifier and filter. Current Loop conditioning circuitsAfter the vector calculation, outputting given current through D/A module, testing feedback current by the current testing circuit, sending them to the simulator of the P1 regulator to regulate, can eliminate static difference and improve the speed of regulation. The output of the analog devices can be regarded as the phaseshifting control signals of the rectifier trigger. Current Loop conditioning circuits as shown in figure 5. The control of speed regulatorSpeed regulator uses dualmode control. Setting a value T N of speed error, when the system is more than the deviation (more than 10 percent of the rated frequency), as rough location of the start, using onoff control, at this time, speed regulator is in the state of amplitude limit, equivalent to speed loop being openloop, so the current loop is in the state of the most constant current regulation. Thus, it can play the overload ability of motor fully and make the process of regulation fastest possibly. When the system enters into a state of small deviation, the system uses PI linear control instead of onoff control. As result, absorbing the benefits of nonlinear and linear, the system meets stability and accuracy. The speed regulator flowchart is as shown in figure 6. Flux RegulationSlip frequency vector control system can be affected by the motor parameters, so that the actual flux and the given flux appear a deviation. This system is of observation and feedback in the amplitude of the magnetic flux, regulating flux of the rotor, actual flux with the changes of given flux.Flux regulator is also the same as the speed regulator, using PI regulator. The discrete formula is: （1）Plus a reminder to forecast for correction: （2） In the formula, is proportional coeff
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