CN109194085B - A large stroke permanent magnet torquer - Google Patents

Abstract

The invention discloses a long-stroke permanent magnet torquer, which belongs to the technical field of electromagnetic components. The invention includes a magnetic steel base, an outer pressure ring, an outer fan annular permanent magnet steel, an inner fan annular permanent magnet steel, an inner pressure ring, a central support column, a coil skeleton and a coil; the inner fan annular permanent magnet steel and the outer fan annular permanent magnet The steel forms a ring respectively, coaxial with the ring-shaped magnetic steel base, and embedded on both sides of the annular boss on the magnetic steel base; the inner fan ring permanent magnet steel is supported by the central support column, and the upper part is fixed by the inner pressure ring; the outer fan ring The outer part of the permanent magnet steel is fixed by an outer pressure ring; the coil is wound on the coil bobbin to form a coil structure suspended on the central support column and embedded in the air gap. The invention adopts the design of the combined fan ring magnet, the effective area of the air gap is long and the linearity of the magnetic induction intensity distribution is good, which greatly increases the effective stroke of the magnetic torque device, reduces the power consumption of the magnetic torque device, and reduces the working area of the air gap. temperature drift.

Description

A large stroke permanent magnet torquer

technical field

The invention belongs to the technical field of electromagnetic components, and relates to a permanent magnet torquer with low power consumption and large stroke. The torquer uses permanent magnet steel as the excitation magnetic field source. After the coil is electrified, it is forced to move in the magnetic field. distribution, which greatly increases the effective stroke of the magnetic torquer. .

Background technique

In some high-precision inertial instruments, such as flexible accelerometers, torquers are required as feedback actuators of the system. The existing magnetic torquer is usually a single permanent magnet structure, the effective stroke is short, and the linearity of the magnetic induction intensity distribution is poor, which makes the closed-loop control system more complicated and the steady-state error is large. Therefore, it is necessary to design a new permanent magnet torquer to increase the effective stroke of the magnetic torquer and improve the uniformity of the air gap magnetic induction intensity distribution.

SUMMARY OF THE INVENTION

The purpose of the present invention is to design a long-travel permanent magnet torquer to overcome the problems of short effective stroke and poor linearity of air-gap magnetic induction intensity distribution in the existing magnetic torquer.

The specific scheme of the present invention is as follows:

A long-stroke permanent magnet torquer, comprising a magnetic steel base (1), an outer pressure ring (2), an outer fan annular permanent magnet steel (3), an inner fan annular permanent magnet steel (4), and an inner pressure ring (5) , a central support column (6), a coil bobbin (7) and a coil (8);

n ₁ piece of inner fan ring-shaped permanent magnet steel (4) forms a ring, coaxial with the ring-shaped structure magnetic steel base (1), the inner part is supported by the central support column (6), the upper part is fixed by the inner pressure ring (5), and the lower part is embedded with the magnetic steel base (1). Inside the boss on the steel base (1), the inner fan annular permanent magnet steel (4) is flush with the bottom of the center support column (6), the fan annular permanent magnet steel (4), the inner pressure ring (5) and the center The top of the support column (6) is flush; n ₂ pieces of outer fan annular permanent magnet steel (3) form a ring shape, the annular structure magnetic steel base (1) is coaxial, the outer part is fixed by the outer pressure ring (2), and the lower part is embedded with the magnetic steel On the outside of the boss on the base (1), the top and bottom of the outer fan annular permanent magnet steel (3) and the outer pressure ring (2) are flush.

The included angle of each fan ring in the outer fan ring permanent magnet steel (3) is 360/n ₂ degrees, and the value of n ₂ is an integer from 4 to 16; each fan ring in the inner fan ring permanent magnet steel (4) The included angle is 360/n ₁ degree, and the value of n ₁ is an integer from 4 to 16.

The coil (8) is wound on the coil bobbin (7) to form a coil structure, the coil structure is coaxial with the central support column (6), is suspended on the central support column (6), and is wound around the hollow cylinder of the coil (8). The structural part is embedded in the air gap between the outer fan annular permanent magnet steel (3) and the inner fan annular permanent magnet steel (4);

The outer fan annular permanent magnet steel (3) and the inner fan annular permanent magnet steel (4) are permanent magnet materials with a low temperature coefficient in the temperature range of 25 to 85°C; the outer fan annular permanent magnet steel (3) and the inner fan annular permanent magnet The direction of the residual magnetic induction intensity of the permanent magnet steel (4) is along the radial direction and the direction is the same. If it is agreed that the outer side of the outer fan annular permanent magnet steel (3) is the N pole, then the outer side of the inner fan annular permanent magnet steel (4) is N pole, the inner side of the outer fan annular permanent magnet steel (3) and the inner fan annular permanent magnet steel (4) are both S poles;

The air gap spacing between the outer fan annular permanent magnet steel (3) and the inner fan annular permanent magnet steel (4) is 0.6 mm to 1.2 mm;

The magnetic steel base (1), the outer pressure ring (2) and the central support column (6) can be made into an integrated structure as required.

Compared with the prior art, the present invention has the following advantages:

The long-stroke permanent magnet torquer of the present invention adopts a new type of combined fan ring magnet design. On the one hand, the effective area of the air gap is long and the magnetic induction intensity distribution linearity is good, which greatly increases the effective stroke of the magnetic torquer and reduces the magnetic field. The requirements of the road section structure and the coil structure for the assembly accuracy; on the one hand, the magnetic induction intensity of the air gap is large, which reduces the power consumption of the magnetic torquer and reduces the temperature drift in the working area of the air gap.

Description of drawings

1 is a schematic structural diagram of a long-stroke permanent magnet torquer of the present invention;

2 is a schematic structural diagram of the magnetic circuit of a long-stroke permanent magnet torquer of the present invention;

3 is a schematic structural diagram of a long-stroke permanent magnet torquer coil of the present invention;

4 is a schematic structural diagram of a torque device in the prior art;

FIG. 5 is a schematic diagram of the effective stroke of the radial magnetic induction intensity on the central axis of the air gap between the torquer provided by the present invention and the torquer shown in FIG. 4 .

Detailed ways

The present invention will be further described in detail below with reference to specific embodiments.

Figure 1 is a schematic structural diagram of a long-stroke permanent magnet torquer provided by the present invention, and the arrows in the figure indicate the direction of the remanence of the magnetic steel. The long-stroke permanent magnet torquer includes a magnetic steel base 1, an outer pressure ring 2, an outer fan annular permanent magnet steel 3, an inner fan annular permanent magnet steel 4, an inner pressure ring 5, a central support column 6, a coil skeleton 7 and Coil 8.

As shown in FIG. 2 , the upper surface of the magnetic steel base 1 has an annular boss, the height of the boss is generally between 0.2 and 0.3 mm, and the width is 0.6 to 1.2 mm, preferably 0.9 mm, corresponding to the width of the air gap; The stage plays the role of fixing the outer fan annular permanent magnet steel 3 and the inner fan annular permanent magnet steel 4 . The inner fan annular permanent magnet steel 4 is samarium cobalt magnetic steel, the central angle is 45 degrees, the outer side of the inner fan annular permanent magnet steel 4 is the N pole, and the inner side is the S pole. The inner side of the 8 pieces of inner fan annular permanent magnet steel 4 is supported by the central support column 6, and the lower part is embedded in the boss on the magnetic steel base 1, wherein the fan annular permanent magnet steel 4 and the bottom of the central support column 6 are flush, and the inner fan annular permanent magnet steel 4 is flush with the bottom. The tops of the magnetic steel 4, the inner pressure ring 5 and the central support column 6 are flush and fixed by gluing. The outer fan annular permanent magnet steel 3 is samarium cobalt magnetic steel, the central angle is 45 degrees, the outer side of the outer fan annular permanent magnet steel 3 is the N pole, and the inner side is the S pole. The 8 outer fan annular permanent magnet steels 3 form a ring, which is coaxial with the magnetic steel base 1 of the annular structure. Outside the platform, the top and bottom of the outer fan annular permanent magnet steel 3 and the outer pressure ring 2 are flush, and finally fixed by gluing.

The inner pressure ring 5 is located in the annular groove machined above the inner fan annular permanent magnet steel 4 .

The height of the outer fan annular permanent magnet steel 3 is not lower than the height of the inner fan annular permanent magnet steel 4 .

The coil 8 is made of enameled wire with a length of 5 meters and a core diameter of 40 microns, which is evenly and tightly wound on the coil bobbin 7 to form a coil structure. As shown in FIG. 3 , the structure of the coil bobbin 7 is a hollow cylinder, the top surface is integrated with the side wall, and there is a central hole in the center of the top surface. The coil structure is coaxial with the central support column 6, and is suspended on the central support column 6, and the side wall of the hollow cylindrical structure winding the coil 8 is embedded between the outer fan annular permanent magnet steel 3 and the inner fan annular permanent magnet steel 4 in the air gap. Applying a current to the coil 8 can generate an electromagnetic force along the axis of the magnet to the driven structure.

Figure 4 shows a torquer in the prior art. Compared with the double-sector annular magnetic steel design structure of the present invention, the effective stroke of the air-gap structure of the torquer provided by the present invention is about 3mm, which is about 3mm compared to the traditional structure. 1mm is increased by more than 3 times.

Because the magnetic circuit structure can provide the coil with a greater radial magnetic induction intensity, when the coil generates the same effective stroke, the driving power consumption is lower, and the working power consumption is reduced by 40% compared with the traditional structure.

The specific examples described above further describe the purpose, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above are only specific examples of the present invention and are not intended to limit the present invention. Within the spirit and principle of the present invention, any modifications, equivalent replacements, improvements, etc. made should be included within the protection scope of the present invention.

Claims (3)

1. A long-stroke permanent magnet torquer comprises a magnetic steel base (1), an outer pressure ring (2), outer fan-shaped permanent magnet steel (3), inner fan-shaped permanent magnet steel (4), an inner pressure ring (5), a central support column (6), a coil framework (7) and a coil (8);

n₁the inner sector ring-shaped permanent magnet steel (4) forms a ring shape, the inner sector ring-shaped permanent magnet steel (4) with a ring-shaped structure is coaxial with the magnetic steel base (1), the inner part of the inner sector ring-shaped permanent magnet steel (4) is supported by a central support column (6), and the upper part of the inner sector ring-shaped permanent magnet steel (4) is fixed by an inner compression ring (5);

n₂the outer fan-shaped permanent magnet steel (3) of the block is annular, the outer fan-shaped permanent magnet steel (3) of the annular structure is coaxial with the magnetic steel base (1), and the outer part of the outer fan-shaped permanent magnet steel (3) is fixed by the outer pressure ring (2);

the coil (8) is wound on the coil framework (7) to form a coil structure, and the coil structure is coaxial with the central support column (6) and is suspended on the central support column (6);

the outer fan-shaped permanent magnet steel (3) and the inner fan-shaped permanent magnet steel (4) are permanent magnet materials with low temperature coefficient within the temperature range of 25-85 ℃;

the residual magnetic induction intensity directions of the outer fan-shaped permanent magnet steel (3) and the inner fan-shaped permanent magnet steel (4) are the same along the radial direction;

the method is characterized in that:

an annular boss is arranged on the upper surface of the magnetic steel base (1);

the lower part of the inner fan-shaped permanent magnet steel (4) is embedded into an annular boss on the magnetic steel base (1), the lower part of the fan-shaped permanent magnet steel (4) is flush with the bottom of the central support column (6), and the top parts of the fan-shaped permanent magnet steel (4), the inner compression ring (5) and the central support column (6) are flush;

the lower part of the outer fan-shaped permanent magnet steel (3) is embedded outside an annular boss on the magnetic steel base (1), and the lower part of the outer fan-shaped permanent magnet steel (3) and the bottom of the top of the outer pressure ring (2) are flush;

the height of the outer fan-shaped permanent magnet steel (3) is not lower than that of the inner fan-shaped permanent magnet steel (4);

the outer side of the outer fan-shaped permanent magnet steel (3) is an N pole, the outer side of the inner fan-shaped permanent magnet steel (4) is an N pole, and the inner sides of the outer fan-shaped permanent magnet steel (3) and the inner fan-shaped permanent magnet steel (4) are S poles;

the outer fan-shaped permanent magnet steel (3) and the inner fan-shaped permanent magnet steel (4) are samarium cobalt steel;

the coil framework (7) is of a hollow cylinder structure, and the side wall part of the hollow cylinder structure wound with the coil (8) is embedded into an air gap between the outer fan-shaped permanent magnet steel (3) and the inner fan-shaped permanent magnet steel (4); the air gap distance between the outer fan-shaped permanent magnet steel (3) and the inner fan-shaped permanent magnet steel (4) is 0.6 mm-1.2 mm.

2. A large-stroke permanent-magnet torquer according to claim 1, characterized in that: the included angle of each sector ring in the outer sector ring-shaped permanent magnet steel (3) is 360/n₂Degree, n₂Is an integer from 4 to 16; the included angle of each sector ring in the inner sector ring-shaped permanent magnet steel (4) is 360/n₁Degree, n₁Is an integer from 4 to 16.

3. A large-stroke permanent-magnet torquer according to claim 1, characterized in that: the magnetic steel base (1), the outer ring (2) and the central support column (6) are made into an integrated structure as required.

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