What is the magnetic coupling principle?
The principle of magnetic coupling is the magnetic force generated by the interaction of permanent magnets to permanent magnets and permanent magnets to conductors to achieve contactless transmission of mechanical power.
Type of magnetic coupling principle
The magnetic coupling has three different working principles: Synchronous, Eddy current, and Hysteresis. The most widely used magnetic coupling principle on the market is synchronous and eddy current.
Synchronous
If the rotating speed of the driving rotor is n1, the rotating speed of the driven rotor is n2, and the transmitted torque is T, the maximum torque that can be transmitted is Tmax, and the intrinsic coercive force of the permanent magnet is jHc1. Both of them use permanent magnets, and when the coercive forces in the two parts are equal and large enough, under the condition of n1=n2 and T<Tmax, the magnetic coupling transmission is called synchronous.
In another word, the permanent magnet synchronous coupler is mainly composed of two parts: the driving rotor and the driven rotor. Permanent magnetic steel is installed on the driving rotor and the driven rotor, and an air gap is set between the driving rotor and the driven rotor. The driving rotor is connected to the motor shaft, and the driven rotor is connected to the reducer shaft.
Eddy current
There are two parts, the active part is a conductor and the conductivity σ is not equal to zero, the driven part is a permanent magnet. At this time, the magnetic coupling actuator is called eddy current.
Put another way, it is a relative slip generated between the conductor rotor and the magnet rotor when it starts running, so that the permanent magnet generates a rotating magnetic field and cuts the conductor rotor. According to Lenz’s law, an eddy current effect will be generated on the conductor rotor. , the electromagnetic torque will be generated on the conductor rotor, so the magnet rotor will rotate with the conductor rotor, realizing the conversion and transmission between magnetic energy and mechanical energy.
Hysteresis
If the active part is a hysteresis material, the intrinsic coercive force is jHc1, and the driven part is a permanent magnet, when the intrinsic coercive force is jHc2, jHc1>jHc2; when T<Tmax, n1=n2, there is no energy loss (Hysteresis loss), at this time the magnetic coupling actuator is called hysteresis