The permanent magnet coupling is a coupling that uses the magnetism of permanent magnets for transmission. This type of coupling has no direct contact between the driving and driven half couplings, so there is no friction, no noise, and Absorbs a certain degree of shaft displacement and angular displacement error, and can play a role of slipping and protection when overloaded. It is suitable for light and high-speed small machinery.

　　According to the structural characteristics of the coupling, there are three types of permanent magnet couplings:

　　1. CD type, with multiple pairs of magnetic plates set on the circular plate, the relative angular displacement between the main and driven shafts is allowed to be about ±5°, and the radial displacement between the axes is 1-3mm. Due to the attraction force between the main and driven plates, Therefore, thrust devices must be provided on both shafts during installation.

　　2. CR type, the inner surface of the outer sleeve installed on one shaft and the outer surface of the inner sleeve installed on the other shaft are equipped with multiple pairs of permanent magnetic poles. The advantage of this coupling is that there is no axial suction. In addition, a radial displacement within 3mm is allowed.

　　3. CU type, when driving in vertical position, angular displacement within 20° is allowed, when driving in horizontal position, angular displacement within 30° is allowed.

　　The permanent magnet coupling is a typical magnetic drive pump used in chemical processes. Its key components are internal and external magnetic steel, isolation sleeves, bearings, etc. The material selection and structural design of these components have a great impact on the reliable operation of the pump.

• Previous page:Z-type shaft hole, J-type shaft hole, Y-type shaft hole on the coupling
• Next page:What are the precautions for hot mounting couplings?