Miniature permanent magnetic torquer with high air gap magnetic field intensity
阅读说明:本技术 一种小型化高气隙磁场强度的永磁力矩器 (Miniature permanent magnetic torquer with high air gap magnetic field intensity ) 是由 梁璞 张习文 李鹏飞 张景铭 魏渊 郑宏科 李苏明 于 2019-10-18 设计创作,主要内容包括:本发明公开一种小型化高气隙磁场强度的永磁力矩器,包括轭铁(1)、永磁体(2)、下磁极片(3)、上磁极片(4)和线圈(5),其中下磁极片(1)位于最底部,永磁体(2)固定于下磁极片(3)上表面,上磁极片(4)固定于永磁体(2)上表面,轭铁(1)与下磁极片(3)连接,同时轭铁(1)和上磁极片(4)之间形成永磁气隙(6),线圈(5)位于永磁气隙(6)内部。本发明采用多个磁极片、变截面永磁体或变截面磁极片的力矩器结构形式,使得轭铁可以在小体积内容纳较大永磁体,提升力矩器永磁体的截面积和磁路的磁通量,显著提升永磁磁路的气隙磁场强度。(The invention discloses a miniaturized permanent magnetic torquer with high air gap magnetic field intensity, which comprises a yoke (1), a permanent magnet (2), a lower magnetic pole piece (3), an upper magnetic pole piece (4) and a coil (5), wherein the lower magnetic pole piece (1) is positioned at the bottommost part, the permanent magnet (2) is fixed on the upper surface of the lower magnetic pole piece (3), the upper magnetic pole piece (4) is fixed on the upper surface of the permanent magnet (2), the yoke (1) is connected with the lower magnetic pole piece (3), a permanent magnetic air gap (6) is formed between the yoke (1) and the upper magnetic pole piece (4), and the coil (5) is positioned in the permanent magnetic air gap (6). The invention adopts a torquer structure form of a plurality of magnetic pole pieces, variable cross-section permanent magnets or variable cross-section magnetic pole pieces, so that the yoke can contain a larger permanent magnet in a small volume, the cross-sectional area of the torquer permanent magnet and the magnetic flux of a magnetic circuit are improved, and the air gap magnetic field intensity of the permanent magnet magnetic circuit is obviously improved.)
1. The utility model provides a miniaturized high air gap magnetic field intensity's permanent magnetism torquer, including yoke (1), permanent magnet (2), lower magnetic pole piece (3), go up magnetic pole piece (4) and coil (5), wherein lower magnetic pole piece (1) is located the bottommost, permanent magnet (2) are fixed in lower magnetic pole piece (3) upper surface, it is fixed in permanent magnet (2) upper surface to go up magnetic pole piece (4), permanent magnet (2), permanent magnet subassembly is constituteed with last magnetic pole piece (4) down magnetic pole piece (3), yoke (1) are connected with lower magnetic pole piece (3), form permanent magnetism air gap (6) between yoke (1) and last magnetic pole piece (4) simultaneously, coil (5) are located inside permanent magnetism air gap (6).
2. A permanent magnetic torquer as claimed in claim 1, wherein the yoke (1) is a magnetic conductive structure having a plurality of stepped through holes, the stepped through holes have a small diameter at the upper part and a large diameter at the lower part, and the lower pole piece (3) is connected to the stepped through holes of the yoke (1).
3. A permanent magnet torquer according to claim 2, wherein the permanent magnet assembly is fixed in the stepped hole of the yoke (1) by the lower pole piece (3) by gluing, glass sintering or laser welding.
4. A permanent magnet torquer as claimed in claim 3, wherein the stabilization process is carried out at a temperature greater than 200 ℃ and less than the curie temperature of the permanent magnet when the fixing means is glass sintering or laser welding.
5. A permanent magnetic torquer according to claim 1, wherein the permanent magnet (2) is of cylindrical or variable section of revolution construction, the ratio of the maximum cross-sectional area to the minimum cross-sectional area of the variable section of revolution construction being greater than 1.2.
6. The permanent magnetic torquer of claim 5, wherein the variable cross-section solid of revolution structure is a combination of a cylinder and a circular cylinder, or a combination of a cylinder and a circular truncated cone.
7. A permanent magnetic torquer according to claim 1, 5 or 6, wherein the upper pole piece (4) is of cylindrical or variable section solid of revolution construction, the ratio of the maximum cross-sectional area to the minimum cross-sectional area of said variable section solid of revolution construction being greater than 1.2.
8. A permanent magnetic torquer according to claim 7, wherein the variable cross-section solid of revolution structure of the upper pole piece (4) is a combination of a cylinder and a circular truncated cone or a combination of a cylinder and a circular truncated cone.
9. A permanent-magnet torquer as claimed in claim 1, wherein the lower pole piece (3), the permanent magnet (2) and the upper pole piece (4) are bonded or sintered.
10. A permanent magnetic torquer as claimed in claim 9, wherein the stabilization process is performed at a temperature higher than 200 ℃ and lower than the curie temperature of the permanent magnet when the connection means is glass-sintered.
Technical Field
The invention belongs to the technical field of flexible pendulum accelerometers, and particularly relates to a miniaturized permanent magnet torquer with high air gap magnetic field intensity for an inertial navigation accelerometer.
Background
The flexible accelerometer for inertial navigation is a core sensitive device of an inertial navigation system, and with the continuous progress of modern aviation technology, high precision, wide range and miniaturization become new requirements for the development of the flexible accelerometer. The volume and the measuring range of the accelerometer are closely related to the coefficient of the accelerometer torquer and the volume of the accelerometer, so that the aim of realizing the large-measuring-range and miniaturization of the accelerometer is fulfilled, the air gap magnetic field intensity of the accelerometer needs to be improved, the volume of the accelerometer is reduced, and the technical bottleneck of the accelerometer is realized by designing the accelerometer which meets the characteristics of large-measuring-range and miniaturization.
The torquer is composed of two parts, one part is a permanent magnetic circuit composed of a permanent magnet, a magnetic pole piece and a yoke, and the other part is a conductive coil fixed on the pendulous reed of the accelerometer. The torquer coefficient of the accelerometer permanent magnetic torquer is improved by two methods, namely increasing the number of turns of a coil and improving the air gap magnetic field intensity of a permanent magnetic circuit. Increase the torquer coefficient to a certain extent through increasing the coil number of turns, nevertheless can bring structural stability problem and coil problem of generating heat simultaneously, so the coil number of turns should not increase too much, adopts the method of promoting air gap magnetic field intensity to increase the torquer coefficient usually. In order to improve the air gap magnetic field intensity of the torquer and reduce the volume of the torquer, the permanent magnetic circuit structure of the permanent magnetic torquer needs to be designed and improved again.
At present, a structural form consisting of a yoke, a permanent magnet and a single magnetic pole piece is adopted for the quartz flexible accelerometer, the size of the permanent magnet is greatly limited by the structural size of the yoke, the air gap magnetic field intensity is difficult to improve in a limited volume, and in order to increase the air gap magnetic field intensity, the volume of the yoke and the volume of the permanent magnet must be increased, so that the high air gap magnetic field intensity and the miniaturization cannot be compatible.
Disclosure of Invention
In view of the above situation in the prior art, an object of the present invention is to provide a miniaturized high-air-gap-field-strength permanent-magnet torquer for an accelerometer, so as to effectively increase the range of the accelerometer and reduce the volume of the accelerometer.
The invention relates to a miniaturized permanent magnetic torquer with high air gap magnetic field intensity, which comprises a yoke iron, a permanent magnet, an upper magnetic pole piece, a lower magnetic pole piece and a coil, wherein the lower magnetic pole piece is positioned at the bottommost part of the structure, the permanent magnet is fixed on the upper surface of the lower magnetic pole piece, and the upper magnetic pole piece is fixed on the upper surface of the permanent magnet, so that the permanent magnet, the lower magnetic pole piece and the upper magnetic pole piece form a permanent magnetic assembly. The yoke iron is connected with the lower magnetic pole piece, a permanent magnetic air gap is formed between the yoke iron and the upper magnetic pole piece, and the coil is located in the permanent magnetic air gap. When the permanent magnetic torquer works, the coil is fixed on the accelerometer pendulum piece through the coil cushion block.
In the miniaturized permanent magnetic torquer with high air gap magnetic field intensity, the yoke iron is a magnetic conduction structure with a plurality of layers of step-shaped through holes, the diameter of the upper part of each step hole is small, the diameter of the lower part of each step hole is large, and the lower magnetic pole piece is connected with the step-shaped through holes of the yoke iron.
In the miniaturized high air gap field strength permanent magnet torquer according to the present invention, the permanent magnet may be a cylindrical or variable cross-section solid of revolution structure, wherein the ratio of the maximum cross-sectional area to the minimum cross-sectional area of the variable cross-section solid of revolution structure is typically greater than 1.2. Similarly, the upper pole piece may be a cylindrical or variable cross-section solid of revolution structure, wherein the ratio of the maximum cross-sectional area to the minimum cross-sectional area of the variable cross-section solid of revolution structure is typically greater than 1.2. In addition, the variable cross section composition form of the variable cross section revolution body structure can be a cylinder + a cylinder, a cylinder + a circular truncated cone or other forms.
In the miniaturized high air gap magnetic field strength permanent magnetic torquer according to the invention, the lower magnetic pole piece is of a cylindrical structure.
In the miniaturized permanent magnetic torquer with high air gap magnetic field intensity, a permanent magnetic component is composed of a lower magnetic pole piece, a permanent magnet and an upper magnetic pole piece, the permanent magnet is fixed on the lower magnetic pole piece, the upper magnetic pole piece is fixed on the permanent magnet, and the fixing mode is bonding or glass sintering. When glass sintering is used, the structure may be stabilized at a temperature above 200 ℃ and below the curie temperature of the permanent magnet.
In the miniaturized permanent magnetic torquer with high air gap magnetic field intensity, the permanent magnetic component is fixedly connected to the yoke iron by gluing, glass sintering or welding (such as laser welding). When glass sintering or laser welding is used, the structure may be stabilized at a temperature greater than 200 ℃ and less than the curie temperature of the permanent magnet.
In the miniaturized permanent magnet torquer with high air gap magnetic field intensity, a yoke step hole, a permanent magnet, an upper magnetic pole piece, a lower magnetic pole piece and a coil are coaxially arranged, and the coaxiality is controlled, and particularly, when the coaxiality is controlled to be below 0.02mm, particularly 0.01mm, the permanent magnet torquer has better linearity.
The permanent magnet torquer adopts a torquer structure form of a plurality of magnetic pole pieces, variable cross-section permanent magnets or variable cross-section magnetic pole pieces, so that a yoke of the accelerometer torquer can contain a larger permanent magnet in a small volume, the cross section of the permanent magnet of the accelerometer and the magnetic flux of a magnetic circuit are improved, the air gap magnetic field intensity of the permanent magnet magnetic circuit is obviously improved, the coefficient of the accelerometer torquer is further improved, the range of the accelerometer is increased, and the volume of the accelerometer is reduced. The accelerometer can meet the design requirements of large range and miniaturization.
Drawings
FIG. 1 is a perspective view of a permanent magnetic torquer of an accelerometer, according to an embodiment of the invention;
FIG. 2 is a cross-sectional view of a permanent magnetic torquer of an accelerometer according to an embodiment of the invention;
FIG. 3 is a cross-sectional view of a permanent magnet or upper pole piece having a variable cross-section solid of revolution configuration in yet another embodiment of the present invention;
fig. 4 is a structural cross-sectional view of an accelerometer permanent magnetic torquer according to another embodiment of the invention, wherein the permanent magnet and the upper pole piece are both of variable cross-section solid of revolution structures.
Wherein: 1-yoke iron, 2-permanent magnet, 3-lower magnetic pole piece, 4-upper magnetic pole piece, 5-coil and 6-permanent magnet air gap
Detailed Description
For a clearer understanding of the objects, technical solutions and advantages of the present invention, the present invention will be described in further detail below with reference to the accompanying drawings and embodiments.
Fig. 1 is a perspective view showing a permanent magnetic torquer of an accelerometer according to an embodiment of the invention, and fig. 2 is a sectional view showing the structure thereof. As shown in fig. 1 and 2, in the present embodiment, the accelerometer permanent magnetic torquer includes a
In addition, when the
Referring to fig. 1 and 2, a
However, the structures of the
When the permanent magnetic torquer of the accelerometer works, the
F=BIL
wherein B is the magnetic field strength of the permanent
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