Two-phase insert-type direct-acting electromagnet with symmetrical force-displacement characteristics

Abstract

The invention discloses a double-phase inserting piece type direct-acting electromagnet with symmetric force-displacement characteristics. The double-phase inserting piece type direct-acting electromagnet comprises an armature component, a stator component, a shell body, a front end cover and a rear end cover, wherein the stator component is of a double-phase current excitation structure, an annular permanent magnet is arranged between a stator right retaining support and a stator left retaining support and divided into the even number of areas according to the whole circumferential evenly-distributed mode, and N pole areas and S pole areas are arranged at intervals. The number of inserted grooves of an armature retaining support is an even number which can be exactly divided by four, the armature retaining support is divided into four areas with the equal inserted groove number, the areas with inserted first armature silicon steel sheets 7 and the areas with inserted second armature silicon steel sheets 8 are arranged at intervals, and the first armature silicon steel sheets 7 and the second armature silicon steel sheets 8 are axially staggered at the half tooth distance.

Description

technical field [0001] The invention relates to an electro-mechanical converter for electro-hydraulic proportional / servo valves in the field of fluid transmission and control, in particular to a two-phase insert-type direct-acting electromagnet with symmetrical force-displacement characteristics. Background technique [0002] In the electro-hydraulic proportional / servo control system, the electro-mechanical converter as a key component of the electro-hydraulic proportional / servo valve has a small working stroke, and its performance mainly pursues the real-time and precision of the conversion of electric energy and mechanical energy, that is, it is required to ensure While maintaining a certain output force / torque, try to achieve a higher dynamic response. In addition, in special environments (such as vehicle or aerospace applications), it is also required that the valve and the electro-mechanical conversion mechanism can reduce the overall size and weight as much as possible...

AI Technical Summary

Problems solved by technology

If it is assumed that the reluctance of the stator core and the armature is zero, the polarized magnetic field intensity generated by the permanent magnets under the four working air gaps is the same, and the magnetic circuit is symmetrical at this time, that is, the electro-mechanical converter obtains excitation currents in different directions The amplitude of the force-displacement characteristics is equal, and the force-displacement characteristics are symmetrical; however, the actual situation is that both the stator core and the armature have a certain reluctance. According to the magnetic circuit theory, the two sections of working gas farther away from the permanent magnet The polarized magnetic field under the air gap is weak, while the polarized magnetic field under the two working air gaps closer to the permanent magnet is stronger, which causes the magnetic circuit asymmetry of the electro-mechanical converter. When the magnetic field of the excitation current When superimposed with the magnetic field differential of the permanent magnet, the force-displacement characteristics of the electro-mechanical converter are affected by the direction of the excitation current, that is, the amplitudes of the force-displacement characteristics obtained under different directions of the excitation current are different, showing a Asymmetrical features, when used as a valve electrical-mechanical converter, this asymmetrical force-displacement characteristic will affect the positioning accuracy of the valve, making it unable to show the high performance that the proportional / servo valve should have

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