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The Research On High Speed Spindle Drive Control Technology For Induction Motors

Posted on:2016-10-06Degree:MasterType:Thesis
Country:ChinaCandidate:R Y PengFull Text:PDF
GTID:2322330479453262Subject:Control theory and control engineering
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Traditional equipment manufacturing industry occupies a pivotal position in Chinese development of economy and national defense construction. CNC machine tool is the work platform of manufacturing industry and is also important. What's more, studying two to three kinds of large and high-precision CNC machine tools is one of the major projects during the "Eleventh Five-Year", and the country attaches great importance to the development of CNC machine tool technology. Spindle drive control technology for induction motors completes CNC cutting tasks through driving cutting tools, and the control performance has a direct influence on the processing performance of CNC machine tools. Therefore, the research on high performance spindle drive control technology has great significance.In this thesis, two questions are researched how flux-weakening current distribute and field-oriented on-line correct in the high-speed spindle drive control technology for induction motors. It uses an indirect field-oriented control(IFOC) method to achieve independent control of torque and flux by the coordinate transformation and the rotor flux orientation. An ideal voltage and current vector locus are derived when the motor is running with constraints as a precondition. And as a guide, the flux-weakening current allocation policy is produced based on a closed-loop voltage reconstruction. To solve this problem that rotor time constant is changing when the motor is running, the influence of rotor time constant deviation on motor control is analyzed, and then a steady rotor flux observation model which does not contain integral part is constructed. What's more, in this thesis, when the magnetic field orientation is accurate, the rotor flux t-axis component is 0 as the reference, and then a method of on-line correction for the rotor time constant based on t-axis component of the rotor flux is proposed. Therefore, the rotor time constant on-line correction may be implemented during the motor steady operation.Finally, in an experiment or simulation platform for the control strategy validation, the results shows that flux-weakening current allocation policy of closed loop voltage has a faster response than the traditional current allocation policy, and rotor time constant on-line correction method can effectively correct the rotor time constant that has deviation to exact value. What's more, this method has small calibration errors and a high feasibility.
Keywords/Search Tags:induction motor(IM), indirect field-oriented, control(IFOC) closed-loop voltage, flux-weakening, rotor time constant, correction online
PDF Full Text Request
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