The Magnetic Circuit Optimization And Performance Of Disc Type Permanent Magnet Eddy Current Governor

As a kind of rotating equipment,permanent magnet eddy current governor,especially the disc type structure,is universally applied in chemical,petroleum,pharmacy and so on for its unique speed adjustment mechanism.In this paper,permanent magnet eddy current governor of disc type not only because it has the advantages of soft start,soft stop and low accuracy of alignment,but also it can realize the non-contact connection between engine and load,by changing the air gap size to adjust the rotating speed and the output torque for high efficiency and energy saving,which makes its application prospect very broad.?Catalog of the national energy conservation technologies?(5)has been explicitly approved industry improvement proposal of energy-saving equipment to develop energy-saving equipment vigorously.So the research on the transfer performance of the permanent magnetic vortex speed regulator is necessary.In this paper,based on the assembled push-pull style magnetic route,magnetic circuit is evolved,and entity model is built by the electromagnetic finite element analysis software Ansoft.It is studied on the relationship between the output torque efficiency,axial force of the permanent magnet eddy current governor and speed difference,so conclusions are reached:with the speed difference reduces,the output torque increases at first and then decreases,and the efficiency increases gradually,meanwhile the axial force is changed from repulsion to gravity.The influence of various structure parameters on torque and axial force of permanent magnet eddy current governor are discussed in detail,getting such conclusions that the smaller the air gap thickness,the greater the torque,and the axial force also increases,so in practical application,the air gap size should be reasonably arranged according to the requirement;There will be an extreme value of thickness of permanent magnet and copper,as the permanent magnet thickness is 10 mm,the copper thickness is 2mm;because the permanent magnet shape is fan body,the output torque will reach the maximum when the rate of thickness and corresponding chord length is 3-4.In the case of the constant magnetic flux,there exists optimal number of permanent magnets based on a certain structure,so this paper can choose 6-10 pole in actual engineering.At the same time,this paper explores the situation of torque in special conditions by using Ansoft software.Under the condition of parallel to the dislocation misalignment,the torque hardly changes when the permanent magnet disc does not exceed the copper edge that is b?4 mm;Under the condition of misalignment deflection dislocation,the output torque of permanent magnet eddy current governor will be increased,which is that under the error the maximum deflection angle is 2°.Through the power analysis,get this conclusion:the difference of the output power and input power is exactly equal to the simulated power consumption of copper.The magnetic density at the radial gap is based on the distribution of the sine curve approximately.The temperature field of permanent magnet eddy current governor is simulated by using workbench software,obtaining the temperature rise of different parts:copper as heat source,the temperature value is the highest;From the temperature distribution of the permanent magnet,the temperature of the permanent magnet is in the safe range,so demagnetization will not happen.