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Principle of magnetic coupling
Jun 14, 2017

Magnetic drive couplings are mainly 2 kinds of structures: planar magnetic drive couplings and coaxial magnetic drive couplings. The magnet is axially charged, coupled with a magnetic pole configured in axial direction called planar magnetic drive couplings. Magnets with radial magnetizing, coupled with the magnetic pole in a radial configuration called coaxial magnetic transmission coupling.

The coaxial magnetic drive coupling is taken as an example to illustrate its working principle. The magnetic drive coupling consists of an outer magnet, an inner magnet and a isolating hood. The inner and outer magnets are composed of permanent magnets along the radial magnetization and magnetizing direction, and the permanent magnets are arranged alternately along the circumferential direction in different polarity and fixed on the steel rims of the low carbon steels to form a magnetic circuit-breaker. The isolation hood is made of a high resistance material that is not ferrite (and thus non-magnetic) and is generally austenitic stainless steel. In the stationary state, the N-pole (S-pole) of the outer magnet attracts and becomes a straight line with the S pole (n pole) of the inner magnet, at which time the torque is zero, as shown in Figure 3. When the external magnet in the driving force of the rotation, the beginning of the magnet as a result of friction and the resistance of the transmission part of the action, is still in a static state, then the external magnet relative to the internal magnet began to offset a certain angle, due to this angle of existence, the N-pole (S-pole) of the outer magnet has a pulling effect on the S-Pole (n pole) of the magnet, while the N-pole (S-pole) of the outer magnet has a catalytic effect on the first n pole (s pole) of the magnet, so that the inner magnet has a tendency to This is the magnetic coupling of the push-pull magnetic circuit working principle. When the N-pole (S-pole) of the outer magnet is situated between the 2 Poles (s and n poles) of the inner magnet, the push pull is maximized, as shown in Fig. 4, thus driving the inner magnet to rotate. In the transmission process, the isolation hood separates the outer magnet from the inner magnet, and the magnetic field is transmitted through the isolating hood to the inner magnet through the power and motion of the outer magnet, thus realizing the non-contact sealing transmission.

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