Magnetic coupler

Abstract

The invention discloses a magnetic coupler which comprises a power input shaft, connecting flanges, permanent magnet outer rotor assemblies, cage type inner rotors, a power output shaft and a mechanical speed adjustment device, wherein the permanent magnet outer rotor assemblies have hollow cup-shaped structures, are sleeved outside the cage-type inner rotors and realize transmission of torque under the coupling action of an air gap magnetic field between the permanent magnet outer rotor assemblies and the cage-type inner rotors; the mechanical speed adjustment device can change axial air gap areas between the permanent magnet outer rotor assemblies and the cage-type inner rotors according to a lever theory, thus realizing stepless speed variation for load rotating speed. According to the magnetic coupler, a method for designing the number of pole pairs of the permanent magnet outer rotor assemblies is provided on the basis of a minimum torque ripple rule, so that the thickness of yokes and the rotating inertia of the coupler are reduced. The cage-type inner rotors can adopt structures which are the same as or similar to that of the conventional motor cage rotor iron core. The magnetic coupler disclosed by the invention can be coaxially connected with a load and can be used as a belt wheel adapter matched with a belt wheel.

Description

technical field [0001] The invention relates to a power mechanical transmission technology, in particular to a magnetic coupling. Background technique [0002] The so-called advanced transmission energy saving refers to the replacement of backward energy-consuming transmission methods with advanced energy-saving transmission methods. Among them, the magnetic coupling drive has excellent functions such as light-load start, overload protection, impact reduction, torsional vibration isolation, etc., so it is applied to large-inertia, difficult-to-start machinery, which can change the backward transmission mode of "big horse-drawn trolley" and save energy significantly. . [0003] Belt transmission is an important form of mechanical transmission and the core connecting part of electromechanical equipment. Its biggest feature is its simple structure, easy replacement and free speed change. [0004] According to statistics, more than 50% of the power transmission form between th...

AI Technical Summary

Problems solved by technology

However, this patented technology is mainly used in the transmission device or equipment that requires no leakage in the production environment. An isolation sleeve is installed between the permanent magnet rotor and the squirrel cage rotor to increase the air gap between the permanent magnet rotor and the squirrel cage rotor. The size and the increase of the air gap lead to an increase in the loss of the magnetomotive force in the air, which reduces the magnetic flux density of the air gap magnetic field. Compared with the permanent magnet of the same volume, its energy conversion efficiency is low, and the torque that can be transmitted is reduced. Small, large permanent magnet magnetic potential loss, low execution efficiency

[0009] The permanent magnet asynchronous magnetic transmission device represented by the US patent (Pub.No.: US2010 / 0277021A1) also uses a squirrel cage rotor in the form of an asynchronous motor. There is no spacer between the permanent magnet rotor and the squirrel cage rotor, so its The air gap flux density is large, the flux leakage is small, and the execution efficiency is high. However, the squirrel cage rotor of the asynchronous motor used is a non-standard structure and needs to be redesigned. Not only the design cycle is long, but also the process and molds need to be re-customized, which increases manufacturing cost

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