Magnetic transmission couplings mainly have two structures: planar magnetic transmission couplings and coaxial magnetic transmission couplings. The magnet is magnetized in the axial direction, and the coupled magnetic pole is arranged in the axial direction, which is called a planar magnetic transmission coupling. The magnet is magnetized in the radial direction, and the coupling magnetic pole is arranged in the radial direction, which is called a coaxial magnetic transmission coupling.
The magnetic transmission coupling consists of an outer magnet, an inner magnet and an isolation cover. Both the inner and outer magnets are composed of permanent magnets magnetized in the radial direction and magnetized in opposite directions. The permanent magnets are alternately arranged in the circumferential direction with different polarities and fixed on the low-carbon steel ring to form a magnetic disconnection body. The isolation cage is made of a non-ferritic (and therefore non-magnetic) high-resistance material. In the static state, the N pole (S pole) of the outer magnet and the S pole (N pole) of the inner magnet attract each other and form a straight line, and the torque is zero at this time, as shown in Figure 3. When the outer magnet rotates under the drive of the power machine, the inner magnet is still in a static state at the beginning due to the friction force and the resistance of the driven part. At this time, the outer magnet starts to deviate from a certain angle relative to the inner magnet. , the N pole (S pole) of the outer magnet has a pulling effect on the S pole (N pole) of the inner magnet, and at the same time the N pole (S pole) of the outer magnet has a push effect on the previous N pole (S pole) of the inner magnet The effect makes the inner magnet have a tendency to rotate, which is the working principle of the push-pull magnetic circuit of the magnetic coupling. When the N pole (S pole) of the outer magnet is just between the two poles (S pole and N pole) of the inner magnet, the generated push-pull force reaches the maximum, as shown in Figure 4, thereby driving the inner magnet to rotate. During the transmission process, the isolation cover separates the outer magnet from the inner magnet, and the magnetic field lines pass through the isolation cover to transmit the power and motion of the outer magnet to the inner magnet, thereby realizing a non-contact sealed transmission.
