Research On Wireless Excitation Power Supply Of Electromagnetic Speed Regulating Motor

Wireless power transfer technology is a hot research topic in recent years,because it solves the problems of safety and convenience in traditional cable transfer.The wireless power transfer technology is applied to the excitation power supply of the motor,replacing the traditional excitation power supply composed of brushes and slip rings,eliminating the potential safety hazards of mechanical wear,reducing the cost of replacing brushes and slip rings,and extending the work of the motor life.This paper proposes to apply the wireless power transfer technology to the excitation power supply of electromagnetic speed regulating motors to establish a wireless excitation power supply.First,a brief introduction to the research status of brushless excitation technology and rotary wireless power transfer technology,and then clarify the content to be studied in this article.The structure of the wireless excitation power supply and the common circuit topology of each part of the circuit are briefly introduced.A new T-shaped CLC compensation circuit is proposed.The compensation circuit has constant current output characteristics and zero input impedance angle characteristics.The equivalent circuit model and magnetic circuit model of the resolver are analyzed.The equivalent circuit model of the wireless excitation power supply is established,and the transmission characteristics of the system are analyzed.The effect of key parameters on the output power and voltage gain of the system was simulated and analyzed using matlab software;the parameter modulation method of the inverter circuit switch tube to achieve zero voltage switch(ZVS)was analyzed,and a quantitative calculation formula was obtained;the analysis deduces the load boundary conditions that ensure the stability of the system's operating frequency and avoid frequency bifurcation.Using saber circuit simulation software to simulate and analyze the existing conclusions,design the hardware circuit parameters and build a wireless excitation power supply experimental platform for experimental verification.The simulation and experimental results have confirmed the correctness of the theoretical analysis,and the working efficiency of the system is above 80%.The paper has 54 figures,11 tables and 54 references.