Electromagnetic permanent magnet combined driving apparatus

Abstract

The invention relates to an electromagnetic permanent composite driving switch and an impact mechanism, comprising a permanent-magnet moving body, an electromagnetic coil, a sleeve, an upper magnetic conductive cover, a lower magnetic conductive cover, an upper force output bar and a lower force output bar, wherein the permanent-magnet moving body is arranged in a space formed by the upper magnetic conductive cover, the lower magnetic conductive cover and the sleeve which are fixedly connected, the permanent-magnet moving body is also arranged inside the electromagnetic coil, the spacing between the upper magnetic conductive cover and the lower magnetic conductive cover is more than the length of the permanent-magnet moving body, the upper and the lower ends of the permanent-magnet moving body are respectively and fixedly connected with the upper force output bar and the lower force output bar, the upper force output bar and the lower force output bar respectively penetrate through through holes in the middle of the upper magnetic conductive cover and the lower magnetic conductive cover, the permanent-magnet moving body is a single permanent magnet and a permanent ferromagnetic composite body, and the permanent ferromagnetic composite body is formed by a permanent magnet and a ferromagnet which are fixedly connected. The invention has the advantages that the overall structure is simple, the instantaneous suction without partial vibration can be formed, the opening and the closing are stable, the opening and closing actions are quick and accurate without fluctuation, and the power failure stability retention at the opening or the closing position can be realized.

Description

technical field [0001] The invention relates to a device in the technical field of electromagnetic drive, in particular to an electromagnetic permanent magnet composite drive device. Background technique [0002] At present, in the application practice of drive technology, it is found that there is a great need for some drive devices that are relatively small in size, but can generate large drive force, and have stable power-off position maintenance. The application of this kind of device, such as in the field of electric power technology, the precise synchronous switching operation of vacuum circuit breakers, realizes the synchronous action of "voltage zero-crossing conduction and current zero-crossing cut-off", which is helpful to avoid high-voltage discharge arcs and inrush currents, and avoid burning contacts. The service life of the vacuum contactor is of great significance. [0003] After searching the existing technical literature, it is found that the Chinese patent...

AI Technical Summary

Problems solved by technology

Although the device is also driven by a composite magnetic field of electromagnetic and permanent magnets, the driving efficiency is high and the driving process is easy to realize, but the output displacement of the driving device is always determined by the joint action of electromagnetic force, permanent magnetic force and external spring force, so , the accuracy of the driving displacement is affected by the accuracy of the real-time excitation current, and it is easy to generate displacement fluctuations. In the case of power failure, the driving displacement position cannot be maintained.

Moreover, since the spring is a fatigue-prone part, if it is used for a long time, such as driving for more than one million times, there may be hidden dangers of fatigue failure, which will affect the safety and stability of the long-term operation of the device

In addition, the central permanent magnet of the permanent magnet telescopic mechanism can only rotate but cannot move as a whole, so its driving displacement is gradually formed with the rotation of the central permanent magnet, and the action is not instantaneous, and the driving stroke also depends on the central permanent magnet itself size, these are not conducive to forming an instantaneous large stroke impact drive

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