| The light buoy is a sign that floats on the water surface to mark the range of the channel,indicate the shallows,obstruct navigation,or to indicate the water surface with special purpose.It usually uses solar panels for power supply,but due to factors such as weather,the solar panel power supply may not be able to meet the working needs of light buoys.Therefore,the development of complementary methods of wave power generation and solar power generation technology has become a new trend for stable power supply for light buoys.Among numerous marine energy sources,wave energy is one of the energy sources with a high energy density ratio and the least impact on the environment during the development process.However,the existing wave energy power generation devices have problems such as bulkiness and difficulty in using low-frequency and low-amplitude wave energy,which makes it difficult to use them in combination with light buoys.Thus,it is very necessary to develop small wave energy power generating devices for light buoys that can amplify low-frequency and low-amplitude wave motions into high-frequency and high-amplitude motions.This thesis designs a light buoy hydraulic magnetic gear generator that can amplify the low-frequency and low-amplitude motion of wave energy into high-frequency and high-amplitude motion,which simulates the torque characteristics of the magnetic gear device.Subsequently,according to the principle of magnetic field modulation that can change the magnetic field distribution on the stator coil,a new type of magnetic modulation structure to increase the induced electromotive force is proposed.Finally,simulation experiments verify the effectiveness of the structure for increasing the induced electromotive force.The specific research contents are as follow:(1)This thesis designs a hydraulic magnetic gear power generation device,which mainly includes a hydraulic stroke amplifying unit,a magnetic gear speed regulating unit,a power generating unit and a connection structure with the light buoy.The hydraulic stroke amplifying unit is used to capture the low-speed reciprocating wave motion,and then amplify the low-amplitude motion of the wave into high-amplitude motion;the magnetic gear speed regulating unit device is used to convert the low-frequency motion of the wave into high-frequency motion,and then drive the mover magnet to generate electricity.According to this research idea,the structure,composition,assembly method of each unit and the connection method between hydraulic magnetic gear generator and light buoy are determined.(2)For the designed magnetic gear speed regulating unit,the relationship between the static torque of the low-speed rotor and the high-speed rotor of the magnetic gear speed control unit and the factors that affect the maximum static torque of the magnetic gear are simulated and analyzed.The research results show that the ratio of the maximum static torque between the low-speed rotor and the high-speed rotor is the reciprocal of the two transmission ratios,which proves that the magnetic gear device transmits torque according to the transmission ratio;The maximum static torque of the magnetic gear high-speed rotor shows a trend of first increasing and then decreasing with the increase of the thickness of the magnetic modulation ring,and a linear trend of increasing with the increase of the thickness of the output rotor.It also shows a trend of first increasing and then decreasing with the increase of the number of output magnet stator poles,and a trend of linear decrease with the increase of the air gap thickness.The research results provide a reasonable argument for improving the maximum static torque of the magnetic gear by optimizing its parameters.(3)In order to further improve the power generation capacity of the power generation device,this thesis also explores the influence of the magnetic yoke and magnetic field modulation structure on power generation.The research results indicate that the yoke device installed outside the stator coil increases the induced electromotive force by about 25%;the installation of a magnetic modulation structure between the mover magnet and the stator coil can indeed increase the power generation capacity of the power generation device.In the direct-acting power generation device,the induced electromotive force is increased by about 4 times;in the rotary power generation device,the induced electromotive force is increased by about 12%.The light buoy hydraulic magnetic gear power generation device proposed in this thesis can amplify the low-frequency and low-amplitude motion of wave energy into high-frequency and high-amplitude motion.In addition,a structure that can increase the induced electromotive force based on the principle of magnetic field modulation is also designed,which provides a new idea for solving the problem of the inability of stable power supply for light buoys. |
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