Research On Compensation Network For Rotary Wireless Excitation Power Supply

In recent years,with the rapid development of the global economy,the alarm bell of energy exhaustion has been sounded constantly.At the same time,the destruction of the ecological environment has also brought harm to human life.Therefore,it is urgent to use renewable energy to replace fossil energy.The use of electric energy is an important way to solve the current energy and environmental problems.Motor as a device to convert electrical energy into mechanical energy is also widely used.In the traditional motor excitation system,the brush and slip ring are mostly used to realize the power transmission between the sender and the receiver of signal.In the process of rotation,the brush and slip ring have bad contact due to mechanical wear and other reasons,which reduces the transmission efficiency of the system.In serious cases,the ring fire occurs and the motor excitation system is burnt out.Because the electromagnetic adjustable speed motor has simple structure,small control power,reliable operation,smooth speed regulation,has the advantages of infinite speed regulation characteristic and is widely used,which is based on the electromagnetic speed motor excitation system,design of rotary wireless excitation source,to replace the traditional slip ring and brush,so as to improve the safety and reliability of system.Firstly,the loose coupling transformer of the core mechanism is selected according to the design requirements of the rotary wireless excitation power supply.The leakage inductance and air gap of the transformer are analyzed,and the mesh of the loosely coupled transformer and the flux density and flux leakage distribution under the rotating state are simulated and analyzed.Then,according to the need of the subject,the compensation network of rotary wireless excitation power supply is designed,the traditional compensation network in the excitation system is analyzed,and the design principles of the compensation network and the output characteristics of four basic low-order compensation structures under different operating conditions are summarized.In order to solve the flaws of the traditional low-order network,proposes two new compensation structure,respectively is P/CLC compensation structure and CLC/P compensation structure.Mutual inductance model and leakage inductance model are established respectively.Then,through the analysis and comparison of their output characteristics,zero-input phase Angle characteristics,the volume,cost and application situation of the compensation structure,CLC/P compensation structure was finally selected as the compensation network in this paper for analysis and design.Then through the analysis ofthe stability of the wireless excitation system,the load boundary conditions are obtained.The method of parameter modulation in a Zero Voltage Switching(ZVS)mode is obtained by analyzing the sensitivity of the compensation parameters.Finally,saber simulation software was used for simulation analysis of the designed compensation network,selection and design of power switch tube,rectifier diode and drive circuit were completed,and an experimental platform was set up for experiments,which verified the rationality and effectiveness of the parameter design of rotary wireless excitation power supply.There are 53 figures,5 tables and 53 references in this paper.