Permanent magnetic compound type asynchronous coupling

Abstract

The invention provides a permanent magnetic compound type asynchronous coupling. The permanent magnetic compound type asynchronous coupling comprises three parts of a driving rotor of a built-in tangential permanent magnetic pole, a compound type driven rotor and an isolation cover. The permanent magnetic compound type asynchronous coupling realizes transmission by coupling of a magnetic field and is the permanent magnetic asynchronous coupling with rotating speed difference between the driving side and the driven side. The invention particularly relates to the permanent magnetic asynchronous coupling which adopts a built-in tangential permanent magnetic structure at the rotor on the driving side, adopts a compound type structure at the rotor on the driving side and forms the magnetic field of the rotor on the driving side by relying on vortex flow. The permanent magnetic compound type asynchronous coupling overcomes the shortcomings of the existing permanent magnetic asynchronous coupling, improves performances, expands the range of applications and can have excellent mechanical features in the full rotating speed difference range regardless of light loads, heavy loads, low-speed, high-speed and other transmission occasions and steady and dynamic processes.

Description

(1) Technical field [0001] The invention relates to a shaft coupling. Especially a permanent magnet asynchronous coupling. (2) Background technology [0002] With the development of permanent magnet materials, electrical materials and other technologies, as well as the improvement of electromagnetic field analysis methods and means, permanent magnet couplings, as a new type of mechanical transmission device, have begun to be widely used in environments with special requirements for sealing, such as Petroleum, chemical, vacuum, cryogenic, pharmaceutical, food, aviation and other fields. According to the speed relationship between the driving rotor and the driven rotor, permanent magnet couplings can be divided into permanent magnet synchronous couplings and permanent magnet asynchronous couplings. Permanent magnet synchronous coupling, such as patent 93112868.4, there are permanent magnet poles made of permanent magnet materials on the surface of both the driving rotor and ...

AI Technical Summary

Problems solved by technology

The existing eddy current permanent magnet asynchronous couplings can be classified into two types according to the structure of the rotor on the eddy current magnetic field side: the first type, the eddy current circuit and the magnetic circuit are in the same structural component during operation, for example, the publication number is In the patent document of GR3026455 (T3), the performance of the coupling with this structure is similar to that of a solid rotor motor, and it can provide a large electromagnetic torque when the slip is running, but when the slip decreases The torque drops rapidly, the mechanical properties are too soft, and the heat is serious, and the transmission efficiency is low; the second type is that the eddy current circuit and the magnetic circuit are in different structural components during operation, such as the patent document with the publication number GB719303(A), which has The performance of the coupling with this structure is similar to that of a squirrel-cage rotor motor, and its mechanical characteristics are better when the slip is small, but when the slip is greater than a certain value (critical slip), the slip The torque decreases rapidly, the mechanical characteristics deteriorate, and even the demand for stable operation with load cannot be met, and it cannot be started with heavy load.

In addition, whether the existing permanent magnet couplings are synchronous or asynchronous, most of the permanent magnets adopt a surface-mounted structure, which is not conducive to the improvement of the magnetic flux density of the coupling magnetic field, but also cannot meet the needs of high-speed transmission.

Images