Basic Theory And Research Of A Rotor-integrated Heat Electrical Source Based On Cam

Portable heat electrical sources are widly used in the outdoor robots,reconnaissance devices in small scale and the digital equaipments for individual soldiers.Available heat electric source couples the electrical generator to the heat engine serially,which has a lower power density and lacks of high integration.A new kind of novel electrical source manufactured by MEMS technology on the motherborde of the electric device is proposed to provide the needed electricity of portable devices.As a result,those electrical sources have a big influence on the power device and are too difficulty in technology.An innovational opposite axial piston engine is proposed to overcome the shortage of existing power system.A novel heat power system which integrates the permanent magnet pole to the outer rotor of engine is invented.High-Power-Density Rotorintergrated Heat Power Source(HRPS),which is said to having higher power to weight ratio,power density and reliability has a widely application.The coupling relationshop between engine and generator,the outer mechanical characteristics,the cylinder boosting system and the partly-flexible power transmission mechansim are analyzed.The main contents of this paper are listed below:The main structure of the intergrated heat power system is intrucduced based on the intergration design method.The function and the layout of the generator system is introduced,based on which the charateristics of engine and generator of the power system are studied.Then an innovational power-conservation-system origining from the camroller mechanism is proposed,based on which the power transmission mechanism and the innovational charge system are presented.It is pointed out that employing novel camroller mechanism to arrange the cylinder circlely is the key parameter to promote the power density of the electric generator system and the space efficiency.In the end,the integrated arrangement and the connection of rotor coil and outer rotor are studied;the general arrangement of engine is introduced.Based on the study of connecting characteristics of permegnent magnent and the outer rotor,the structure of engine is introduced.(2)As a way to analyze the thermodynamic process of engine,the novel cylinder boosting system used to boost the waste gas in power cylinder is introduced.The characteristics of cylinder boosting system are studied.The combustion process is analyzed after the mass and energy balance is studied.The mathematical model based on the two-zone combustion model is built to analyze the combustion and boosting process.Then a simulation model of engine combustion is established to study the thermodynamic process.CFD method is applied to the study the working cycle in cylinder.The fluid field in cylinder is achieved from the CFD model.The optional cylinder ratio of charging cylinder and power cylinder is studied.Results show that when the ratio of charging cylinder and power cylinder is larger than 1.78,the highest pressure in power cylinder can be effectively increased.The influence of advancing angle and engine speed on the performance of engine are studied.As a way to determine the economical running state,optional values of related parameters are studied to ensure engine running in the most economy state.(3)The contacting characteristics of end acting cam are studied.The structure of cam-roller is studied to analyze the contacting behaviour,a kinametical model of contacting beheavior is built using coordernate transformation to study relative sliding chracteristics and the space trace of contacting point of cam and roller.At the same time,the contacting behavior of the cam and roller is simulated.A simplified contacting model is built using transient dynamic method to analyze contacting behavior at the rated working condition.Then the transmission characteristics of power transmission mechanism is studied.(4)The mechanical characteristics of partly-flexiblity engine components are studied.At first,the internal force of power transmission emchansim is studied as a way to determine the preload force of adjusting part.The stress distribution between cam and roller are studied.The finite element is applied to analyze the mode and stiffness of linker system.A model is built to simulate the influence of structure parameters on the stiffness of structure.Result shows the two neibouring slots are set to 9mm and 8mm respectively could forces the axis of pin after deformantion parallel to the axis before deformation.The force analyse of power transmission are taken out.The simplified model of power transmission mechanism is established based on the multi-body dynamics.The dynamical characteristics of power transmission mechanism is studied.The acceleration of engine without load is achieved using numerical method.The displacement,velocity and acceleration of piston are studied under stable state.The deformation and internal stress of liner system and adjusting part are analyzed,so are the variation of instant power and net power of sperated cylinder.Results show that in the rated working condition,the inertia force acting on components will leads to the deformation of components.(5)The electric-mechiansm coupled characteristics of electric source are studied by establishing the model of coupled behavior of engine and electric generator.A 3d model of generator is established after the structure is determined.The flux in air gap,the coefficient of coil,pole winding and short-pitch of winding are calculated to establish the mathematical model of generator.The simplified mathematical model of engine is built.The relationship between engine speed,torque and the opening of carburetor is analyzed.The coupled model of electric source is built to analyze the electrical characteristics.The coupled model of heat power and the magnetic assembly is built to study the voltage,current,power and the magnetic torque of electric source under the constant load and the varying load.