Single-phase inserting piece type direct-acting electromagnet with symmetric force-displacement characteristics

Abstract

The invention discloses a single-phase inserting piece type direct-acting electromagnet with symmetric force-displacement characteristics. The single-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 single-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 surface of an armature retaining support is divided into areas corresponding to the permanent magnet, and the areas with inserted first armature silicon steel sheets 5 and the areas with inserted second armature silicon steel sheets 15 are arranged at intervals. Second rectangular teeth on the first armature silicon steel sheets 5 need to be behind the distance of one tooth width on second rectangular teeth of the second armature silicon steel sheets 15, while third rectangular teeth on the first armature silicon steel sheets 5 need to be in front of the distance of one tooth width of third rectangular teeth on the second armature silicon steel sheets 15.

Description

technical field [0001] The invention relates to an electro-mechanical converter for an electro-hydraulic proportional valve in the field of fluid transmission and control, in particular to a single-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 magnet under the two working air gaps is the same, and the magnetic circuit is symmetrical at this time, that is, the force obtained by the electromagnet under the excitation current in different directions- The amplitude of the 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 poles under the working air gap that are far away from the permanent magnet The polarizing magnetic field strength is weak, while the polarizing magnetic field under the working air gap near the permanent magnet is strong, which causes the magnetic circuit asymmetry of the electromagnet. When the magnetic field of the exciting current and the magnetic field of the permanent magnet are differentially superimposed , the force-displacement characteristics of the electromagnet are affected by the direction of the excitation current, that is, the magnitudes of the force-displacement characteristics obtained under excitation currents in different directions are not equal, showing an asymmetric feature. When it is used as a valve When the electro-mechanical converter is used, this asymmetric force-displacement characteristic will affect the positioning accuracy of the valve, making it unable to show the high performance that the proportional valve should have

Images