Series Design Analysis And Experimental Study Of Permanent Magnet Eddy-current Coupling

The main function of the coupling is to connect the drive shaft and the load shaft to achieve the purpose of transmitting torque.It is mainly divided into contact couplings and non-contact couplings.Contact coupling,the transmission of torque through mechanical connection,commonly used is a flexible coupling,which has a flexible original inside,so that it has a certain ability of buffer absorption,and often used for frequent starting and alternating loads under working conditions.However,due to the contact,the coupling has a certain degree of wear,and at the same time,noise is generating,thereby affecting the service life of the coupling.The most commonly used hydraulic coupler for non-contact couplings is the transmission of power through liquid power,but the energy loss during transmission is relatively large,resulting in low transmission efficiency,complicated internal structure and high processing cost.It requires high installation accuracy so that it cannot be widely applied.The permanent magnet eddy current coupling is a new type of non-contact torque transmitting coupling.The magnetic induction line generate by the permanent magnet is cut by a copper disk,and an equivalent eddy current is formed on the surface of the copper disk,and the eddy current generates an anti-inductive magnetic field.The transmission of torque is achieved by the interaction of the anti-inductive magnetic field and the original magnetic field.Due to the non-contact transmission characteristics,the permanent magnet eddy current coupling allows a certain axial offset,which can effectively eliminate the vibration generated when the main and driven ends are driven,prolong the service life of the equipment and improve the reliability of the transmission.At the same time,the existence of the gap reduces the requirement of neutrality during installation and reduces the installation cost of the equipment accordingly,so it has a broad application prospect.Based on the analysis of the magnetic field of the permanent magnet eddy current coupling,a mathematical model was established to derive the theoretical torque calculation formula.The simulation structure model was established by Ansoft software to serialize multiple key parameters(rotational speed difference,copper disk thickness,aluminum disk outer dimensions,permanent magnet outer dimensions,permanent magnet thickness)of the permanent magnet eddy current coupling under multiple powers.Theoretical analysis and simulation study show the variation of key parameters of permanent magnet eddy current coupling under multi-power,and provide design basis for serial mass production of permanent magnet eddy current coupling.In order to verify the feasibility of the simulation model structure,the low-power permanent magnet eddy current coupling was trial-produced,and the characteristic test platform of the permanent magnet eddy current coupling was built.The transmission performance and related structural parameters of the prototype were tested and verified.The test shows that the simulation value is in good agreement with the experimental value,which verifies the correctness of the simulation model and shows that the simulation model can be used as the basis for serial analysis.