Study On Speed Regulating Performance And Magneto-thermal-solid Coupling Of Magnetic Coupling

Magnetic coupling transmits torque through the interaction of magnetic field,which has the characteristics of no leakage and avoiding vibration transmission,etc.It is widely used in petroleum,chemical,pharmaceutical and other occasions with strict requirements on sealing.Since electromagnetic,temperature rise,mechanical and other factors have a significant impact on the performance of magnetic coupling,the temperature rise caused by eddy current loss during its operation will not only cause demagnetization of the permanent magnet,but also cause large thermal stress due to temperature rise change.In order to study the speed regulation performance of magnetic coupling and the characteristics of magneto-thermal-structure coupling,the speed regulation characteristics,temperature rise characteristics and thermal stress of magnetic coupling were simulated based on the method of magneto-thermal-structure multi-field coupling.The main research work of this paper is as follows:(1)The structural model of magnetic coupling was established,the magnetic circuit was analyzed by equivalent magnetic circuit method and Kirchhoff’s law,and the torque formula and speed regulation relationship of magnetic coupling were deduced theoretically.The speed regulation characteristic of magnetic coupling is simulated and analyzed by electromagnetic simulation software and its speed regulation characteristic curve is obtained.(2)The temperature field calculation model of the magnetic coupling was established,and the magneto-thermal coupling calculation was carried out to obtain the temperature distribution of the magnetic coupling as a whole and each part.The temperature rise variation of the magnetic coupling under constant torque load is simulated and the temperature variation trend of the copper disk and the permanent magnet in the speed regulation is obtained.When the constant load torque is 280N·m,the maximum temperature of the permanent magnet is 91.672℃.Meanwhile,the temperature distribution of the permanent magnet is not uniform,and the highest temperature is located in the center of the permanent magnet.(3)The stress field calculation model of the magnetic coupling was established,and the magneto-thermal-solid coupling calculation was carried out for the magnetic coupling.The stress distribution law of the aluminum plate and the permanent magnet under different loads and the stress variation in the speed regulation interval were analyzed emphatically.The influence of the interference between the permanent magnet and the aluminum disk and the temperature of the driven disk on the stress distribution is discussed.Since the stress of the permanent magnet and the aluminum disk of the permanent magnet increases with the increase of the assembly interference,the dimensionless value of the overall interference should be avoided to exceed0.0005.In this paper,the speed regulation performance and magneto-thermal-solid coupling characteristics of the magnetic coupling are simulated,and the influence of interference and temperature on the stress distribution of the magnetic coupling is discussed,which provides a reference for the subsequent assembly and use of the magnetic coupling.