Disk type permanent magnetic transmission device with self-protection function

Abstract

The invention discloses a disk type permanent magnetic transmission device with a self-protection function. The disk type permanent magnetic transmission device includes an inner rotor and an outer rotor; the inner rotor comprises an inner rotor shaft, an inner rotor rotating disk, a radial fixed guide assembly and a plurality of springs; the inner rotor rotating disk is formed by enclosing a plurality of concentrically-arranged sector disks; the size of an inner cavity formed by enclosing the plurality of sector disks is a variable coupling area; the outer rotor comprises an outer rotor shaft, outer rotor movement disks and electric conduction metal disks. With the above structure adopted, speed adjustment can be realized through adjusting the variable coupling area, and therefore, axial space can be saved; when the inner rotor or the outer rotor are locked, electromagnetic forces between the inner rotor rotating disk and the electric conduction metal disks is electromagnetic repulsive forces; each sector disk can move fast towards a place where radius is minimum along the radial fixed guide assembly under the action of the electromagnetic repulsive forces and the elastic force of the springs, so that the variable coupling area can be decreased; and permanent magnets and the electric conduction metal disks are staggered, and therefore, eddy-current loss can be decreased, and self-protection of a mechanism can be realized.

Description

technical field [0001] The invention relates to a permanent magnet eddy current transmission device, in particular to a disc type permanent magnet transmission device with self-protection. Background technique [0002] The existing permanent magnet eddy current transmission device is mainly composed of two parts: a permanent magnet rotor and a copper (or other conductor) rotor. Generally, the motor shaft and the working machine shaft are respectively connected to one of the rotors, and there is an air gap (called an air gap) between the copper rotor and the permanent magnet rotor, and there is no mechanical connection for torque transmission. In this way, a soft (magnetic) connection is formed between the motor and the working machine, and the shaft torque and speed of the working machine can be changed by adjusting the air gap, so it can adapt to various harsh environments, and because there is no direct mechanical connection, it can reduce Mechanical loss. [0003] In th...

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Problems solved by technology

[0005] In addition, when the thickness of the air gap is constant, once one of the inner and outer rotors is blocked, a large eddy current will be generated, which will cause the conductive metal disk as a conductor to heat up severely, and even burn out.

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