The Design And Research Of Contactless Excitation Power Supply’s Resonance Compensation

Contactless synchronous motor excitation power supply’s core technologyis the loosely coupled inductive power transfer technology, using thenon-contact magnetic tank transformer’s energy coupling to achieve a realsense of brushless excitation of synchronous motor, replaced the brush and slipring of traditional excitation system. This excitation source has manyadvantages such as high safety, high environmental protection, lessmaintenance and so on. This dissertation designed a contactless synchronousmotor excitation power supply with resonance compensation circuit.This dissertation introduced the operating principle and basic structure ofcontactless excitation power supply at the first, expounded its research statusand development trend. Then studied the contactless excitation power supply’score device-loosely coupled magnetic tank transformer, according to thecharacteristics of loosely coupled itself, used mutual inductance couplingmodel to build the modeling of loosely coupled transformer, and simplified iton this basis, finally obtained the equivalent circuit of loosely coupledtransformer. And used ANSOFT Maxwell software to simulate the looselycoupled transformer, respectively from the selection of core material,the analysis of coil’s structure, the affect of air gap on loosely coupledtransformer’s parameters three aspects studied its electricity transmissionperformance.Secondly, in this dissertation made a study on the resonance compensationprinciple of the contactless energy transmission. And made a resonancecompensation of mutual inductance model of loosely coupled transformer, analyzed the characteristics of contactless power transmission system withdifferent compensation modes. Through the secondary side’s resonancecompensation obtained the value of compensation capacitance, then deducedthe value of primary side’s capacitance compensation by reflected resistance,at last concluded the primary and secondary side’s compensation capacitancevalue with four different compensation modes. And through analyzedthe power transmission performance deduced the equivalent load to obtainmaximum transmitted power’s condition under different compensation modes,optimizing the performance of the contactless energy transmission circuit.Contactless high frequency DC/DC converter excitation is the main partof excitation power supply. This dissertation designed the main circuittopology circuit, driving control circuit, related circuit and High-frequencyloosely coupled magnetic tank transformer’s compensation circuit. Theprimary side of contactless transformer used half-bridge inverter circuit asinverter circuit, secondary side connected used synchronous rectifier circuit asrectifier circuit; Used a high level of integration chip LM5035and itsperipheral circuit as the converter’s drive circuit and the converter’s controlcircuit. Compared with the traditional control chip, this control chip can makethe converter have a higher transmission efficiency and stability performance;Then designed the corresponding feedback circuit and protect circuit, in orderto perfect the contactless half-bridge resonance conversion circuit.Finally, through the MATLAB/Simulink software analyzed the simulationof compensation circuit and excitation power supply. Set up a contactlesssynchronous motor excitation power supply experiment platform, thenexperimental studied and analytical tested the performance of excitationpower supply with different compensation, the experiment results hadbeen contrasted and analyzed, and verified the theoretical analysis results inthis dissertation.