Theory And Experimental Test Of High-temperature Magnetic Pump

As the character of no leak, magnetic drive pump is widely used in pumping dangerous, costly liquid and so on. In recent years, with the development of computer technology, scholars have done some research in the theory about the magnetic pumps. The further development of magnetic pump was limited because of the demagnetization problem of permanent magnet at high temperature.To solve the demagnetization problem of permanent magnet, a new magnetic drive device was designed. A new method was adopt to simulate torque based on the principle of electromagnetic coupling. A number of factors having effect on torque were considered. The main work of this paper is outlined as follows:1. The principle, characteristics, develop trend of magnetic pump and magnetic drive technology were introduced. The main problems which need to be solved in the develop-process were pointed out. The idea that inner magnetic rotor was replaced by torque ring was proposed to solve the demagnetization problem of permanent magnet.2. A new drive device used in high-temperature magnetic pump was designed considering the selection of permanent materials and design of magnetic circuit.3. According to the interaction between electricity and magnetism, the working principle of the new drive device was analyzed. Torque ring cuts magnetic flux when electromotor drive external magnetic rotor, then current is produced in the torque ring, and Loren magnetic is generated when the torque ring with the current continually cut magnetic flux, so the torque ring rotates.4. The electromagnetic field theory of the new drive device was analyzed, and three methods of the solution of electromagnetic force and torque were summarized.5. By varying relative speed between external magnetic rotor and torque ring, a new simulation method of electromagnetic coupling was found which can simulate induced current directly, and the torque of the magnetic transmission was calculated in General Postproc by using the methods of virtual work theory and maxwell stress tenser. Changes of torque were analyzed with different number of external magnets, rotative speed difference, number of copper bars, thickness of yoke, thickness of air gap and permanent magnets.6. To verify the reliability of the simulation results, a simple test device was designed and tests were carried out. Strength check of torque ring was made according to the maximum shear stress theory.