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The Vortex Magnetic Coupling Principle

The magnetic coupling speed-regulating drive realizes the torque transmission from the motor to the load through the air gap between the magnetic conductor and the permanent magnet. This technology enables no mechanical connection between the motor and the load side. The magnetic coupling principle is that the rare metal BFeNd permanent magnet at one end interacts with the induced magnetic field at the other end to produce torque, and the transmitted torque can be controlled by adjusting the air gap between the permanent magnet and the magnetizer, so as to achieve the load speed regulation.


The permanent magnetic coupling speed-regulating drive is mainly composed of a copper rotor, permanent magnet rotor and controller. The copper rotor is fixed on the motor shaft, and the permanent magnet rotor is fixed on the load rotating shaft. There is a gap (called air gap) between the copper rotor and the permanent magnet rotor. In this way, the connection between the motor and the load is changed from the original mechanical connection to the magnetic connection, and the transmitted torque can be controlled by adjusting the air gap between the permanent magnet and the magnetizer, so as to achieve the load speed regulation. As can be seen from the above analysis, adjustable, controllable and repeatable load speed can be obtained by adjusting the air gap.


The magnetic coupling principle follows the strict and standard law. In this principle, magnetic induction is generated by the relative motion between a magnet and a conductor. That is to say, the output speed of the magnetic coupling speed-regulating drive is always smaller than the input speed, and the speed difference is called slip frequency. Generally, when the motor is in full rotation, the slip frequency is between 1%- 4%. The input torque is always equal to the output torque, so the motor only needs to produce as much torque as the load requires. The ability to transmit energy and controlling speed is not affected by the small angle deviation between the motor shaft and the load shaft due to the misalignment of the installation, which eliminates the vibration problem caused by the misalignment.


Under the standard of magnetic coupling principle, because there is no mechanical connection, even the vibration caused by the motor itself will not cause the load vibration, which can effectively reduce the vibration problem of the whole system. The controller adjusts the speed of load by processing various signals, including pressure, flow, displacement and other process control signals. The existing equipment can be transformed conveniently without modifying the existing motor and power supply. After installation, there will be no electromagnetic interference to the whole system. In most cases, it is sufficient to shut down or dismantle the existing process control hardware. The load will operate at an optimal speed, increasing energy efficiency and reducing operation and maintenance costs. After the introduction of this article, you must have some basic understandings of vortex magnetic coupling principle. In the field of industry, this principle has been widely used and can be seen everywhere.

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Huilong Industrial Zone Qiuga Town Ningbo China
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