Research On Transformer And Compensation In Contactless Synchronous Motor Excitation System

Some electrical contact for a wide range of hybrid automotive industry synchronous motor excitation brought disadvantages, to design a new type of excitation system without brushes and slip ring structure, referred to as contactless synchronous motor rotor excitation system. The core technology of contactless synchronous motor rotor excitation system is loosely coupled inductive power transmission technology. Relative rotating part and relative stationary part coexist in special operating characteristics of the transformer,achieved a real sense of brushless excitation. The design of the motor excitation system is environmentally friendly, safe, and does not require frequently maintenance.First, this dissertation expounds the background significance and research status, and introducts the basic principle and structure of contactless synchronous motor rotor excitation system. Then, the paper analysis full-wave rectifier of every part in the system, such as half-bridge inverter circuit, loosely coupled magnetic tank transformer, the transformer center tapped and usual model loosely coupled transformer resonant compensation principle.Second, the dissertation simulated analysis contactless synchronous motor rotor excitation system, including transformer input waveform Fourier analysis,contactless magnetic tank transformer coil winding different topologies and different working air gap Ansoft2 D simulation, Matlab simulation of the entire excitation system. Then determine the design of the transformer windings are wound adjoining type topology based on simulation results, and set the working air gap of the transformer as 1mm.Contactless synchronous motor rotor excitation system hardware design is the focal and difficult point of the entire design. Block design method is used in this paper. The whole system is divided into two parts, respectively the control circuit which core is chip LM5035 and loosely coupled magnetic tank transformer. The half-bridge inverter circuit was chosen as the contactless transformer primary side inverter circuit, secondary side use transformer center tapped synchronous rectifier circuit as rectifier circuit.As for the control circuit, we choose the chip LM5035 and its peripheral circuit, which has the high level of integration and high work frequency. The reason why we choose LM5035 instead others is that chip LM5035 can improve the transmission efficient and stability performance.Finally, set up a contactless synchronous motor rotor excitation power supply experiment platform, then sample and analyze the output voltage and current of different air gap. Compare the different speed of the motor system efficiency, then test the performance of the whole system. Through the comparation and analysis of performance indicators in the process of excitation system, this paper verify the rationality of theoretical analysis results in this dissertation and prove the excitation systems designed in this paper with high availability and research value.