Novel speed-adjustable cylindrical permanent-magnet eddy-current coupler

Abstract

The invention relates to a novel speed-adjustable cylindrical permanent-magnet eddy-current coupler. The novel speed-adjustable cylindrical permanent-magnet eddy-current coupler comprises an inner rotor 1 and an outer rotor 2, wherein a permanent magnet 5 is embedded onto the outer rotor 2, the inner rotor 1 is of a squirrel cage structure, a speed regulation mechanism 3 is arranged on the inner rotor, an inner rotor guide strip 3 moves along a radial direction through driving the speed regulation mechanism 3 by a motor 21, the thickness adjustment of an air gap magnetic field is achieved, thesize of a magnetic field at a position where the guide strip 8 is located is further changed, and the speed regulation function is achieved. Compared with a traditional speed-adjustable permanent-magnet eddy-current coupler, the novel speed-adjustable cylindrical permanent-magnet eddy-current coupler is compact in structure, no eccentric force is generated, the problem of an axial force brought by structure asymmetry after speed regulation is prevented, and the novel speed-adjustable cylindrical permanent-magnet eddy-current coupler has wide application prospect.

Description

technical field [0001] The invention belongs to the technical field of magnetic drive, and relates to a permanent magnet eddy current coupling, in particular to a novel speed-adjustable cylindrical permanent magnet eddy current coupling. Background technique [0002] The permanent magnet coupling is a component that uses the magnetic force generated by the permanent magnet material to realize the non-contact transmission of torque. Compared with traditional mechanically connected couplings, permanent magnet couplings have the advantages of smooth operation, no leakage, and overload protection. Among them, the permanent magnet eddy current coupling has asynchronous characteristics in the speed, can realize the adjustment of the output speed and soft start and other functions, and can also avoid the harmonic pollution of the power grid caused by the frequency conversion speed regulation of the motor, so it has been used in industrial production. It has been widely promoted an...

AI Technical Summary

Problems solved by technology

The two kinds of speed regulating mechanisms realize the speed regulation by moving the rotor of the disc structure permanent magnet eddy current coupling along the axis, and then changing the thickness of the air gap magnetic field. This driving method has a large axial force, which has a great impact on bearings and other components. Larger damage, and for the patent CN105449981A, it is necessary to push the entire motor to move, the speed regulating mechanism requires a large force, and the cost is high, while the patent CN206628970U adopts manual speed regulation, which is not practical

Patent CN103401396B and patent CN202160092 respectively realize a cylindrical structure adjustable speed permanent magnet eddy current coupling. Both patents use the speed regulating mechanism to drive the rotor to move along the axis, so that the meshing area of ​​the inner and outer rotors is changed to realize the adjustment. On the one hand, this speed regulation method will cause a waste of magnetic pole action area. On the other hand, due to the asymmetry of the inner and outer rotor structures after speed regulation, there will be axial force after speed regulation. At the same time, the current speed-adjustable permanent magnet eddy current Due to the existence of the speed regulating mechanism, the coupling generally has eccentric force, which is not conducive to the transmission of torque

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