Research On Electromagnetic Linear Actuator's Energy Conservation And Heat Dissipation

Compared with cam actuated valve train in traditional engine,electromagnetic driven valve train is capable of adjusting the valve movement flexibly within the whole operating range.The engine equipped with electromagnetic driven valve train will have optimal performance under various working condition,thus significantly improve the performance of power and environmental protecting of the engine.Electromagnetic linear actuator is the core driving element of the electromagnetic driven valve train.Its power consumption and performance can directly affect electromagnetic driven valve train's consumption,adaptability in high-speed motion and stable long-term working reliability that influence the power performance and fuel consumption of the engine.Therefore,researches on energy consumption and saving technology of the electromagnetic linear actuator have great values both on theory and practice.Through theoretical analysis,mathematical modeling,simulating calculation and experimental verification,the thesis carries out further research on electromagnetic linear actuator's energy consumption,changing laws,and the technology of energy conservation and heat dissipation as well.The main works and results of the thesis are summarized as following:(1)The thesis makes clear that the energy consumption structure of the electromagnetic linear actuator,and establishes mathematical model of energy consumption mainly based on copper loss and iron loss.By means of electromagnetic field finite element simulation software Ansoft Maxwell,2D and 3D finite element simulation models of the electromagnetic linear actuator are built.Then the actuator's electromagnetic characteristic and energy consumption are simulated,which lays a theoretical foundation for regulation research on energy consumption of the electromagnetic linear actuator.(2)It studies the distribution and changing law of the electromagnetic linear actuator's energy consumption,and also analyzes the major influencing factors of the actuator's energy consumption.In order to verify the simulation model's accuracy of electromagnetic linear actuator's energy consumption,a locked-mover test on the actuator is proposed in this paper.In the end,the result shows that the energy consumption's test data agrees well with the simulating calculation.(3)Concept of the electromagnetic linear actuator's energy saving is researched from the certain aspects as structural development and material optimization.Three concepts of consumption reduction are presented such as inner core wire cutting,magnetic shoe joint and soft magnetic material improvement.And then it deeply analyzes the advantages and feasibility of every concept.Subsequently,a new concept combining those three is proposed after the synthetic analysis.Via comparative analysis on simulation,it verifies the new concept's excellence in electromagnetic performance improvement and consumption reduction of the electromagnetic linear actuator.(4)From the basic principle of heat transfer,the thesis analyzes the internal heat exchanging process of the electromagnetic linear actuator.Using finite element simulation software Ansoft Maxwell and Ansys Workbench,it establishes the two-way coupling simulated model between electromagnetic field and temperature field of the electromagnetic linear actuator,and analyzes the actuator's heat distribution and temperature rise change through simulation calculation.Additionally,this thesis further explores the influence of environment temperature and convective heat transfer coefficient at the actuator's temperature rising.(5)By building up the test bench and selecting suitable instruments,temperature rise of the electromagnetic linear actuator is tested,and the test data is compared with the simulation result of temperature field,which proves the accuracy of the two-way coupling simulated model between electromagnetic field and temperature field.The thesis also explores the heat dissipation solutions of the electromagnetic linear actuator,and it analyzes and tests on forced air cooling concept.Therefore,it provides a good base for the follow-up research on the actuator's heat dissipation and performance improvement.