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(1) sliding phenomenon
　　
When the magnetic pump during operation overload or rotor stuck, the magnetic actuator of the main and driven parts will automatically slide off, this time with the active part of the driven parts are not synchronized operation, resulting in demagnetization. Which is characterized by:
　　
â‘ pump outlet pressure drop. â‘¡ pump motor current decreases. â‘¢ magnetic actuator rapid temperature rise.
　　
Long time operation of the permanent magnet on the magnetic actuator in the active rotor under the action of alternating magnetic field, will produce eddy loss, magnetic loss, resulting in increased permanent magnet temperature, the magnetic force failure, but also on the pump sliding bearing Cause damage.
　　
(2) The reasons causing the magnetic pump sliding magnetic
　　
①The original tube is used with a pump, pump outlet pipeline DN100. After the replacement pump requires export pipeline DN65. However, due to the construction more difficult, still using the original DN100 pipeline. When operating the pump in this way, it is difficult to control the degree of opening of the valve at the outlet of the pump, thereby easily causing the pump to be overloaded and running, resulting in sliding magnetism. ② As the density of liquefied gas varies greatly with the temperature and pressure, when the magnetic pump is used to transport the liquefied gas, the working conditions of the pump vary greatly and the possibility of cavitation of the pump increases to generate sliding magnetic. The operator's sense of responsibility is not in place, the magnetic pump operation can not grasp the level of the tank in a timely manner, the pump evacuation slip. ④ magnetic moment design is too small. ⑤ did not promptly clean the pump magnetic coupling sleeve, magnetic attachment more, so that the magnetic force decreased, resulting in the operation of sliding magnetic.
Analysis of Magnetic Slip Force of Magnetic Pump and Analysis of Its Causes
     Magnetic pump is a centrifugal pump , magnetic actuator, motor composed of three parts, also known as magnetic drive pump . Working principle is to n pairs of magnets (n is an even number) according to the law arranged in the magnetic drive on the inner and outer magnetic rotor, so that the magnet part of each other to complete the coupling of the magnetic system. When the inner and outer two poles are in opposite polarities, that is, the displacement angle between the two poles is Φ = 0 °, the magnetic energy of the magnetic system is the lowest. When the poles rotate to the same poles, that is, the displacement angle Φ = 2π / n, the maximum magnetic energy of the magnetic system. Remove the external force, as the magnetic system of the poles repel each other, the magnetic force will restore the magnet to the state of the lowest magnetic energy, so the magnet to produce movement, driven by the rotation of the magnet rotor. Magnetic field can penetrate the air gap and non-magnetic material, driven by the rotor connected with the impeller for synchronous rotation, to achieve non-contact power transmission, thus completely solve the pump leakage problem.