CN211127441U - High-frequency direct-acting force motor with symmetrical magnetic circuit - Google Patents

Abstract

A high-frequency direct-acting force motor with a symmetrical magnetic circuit, including an armature part, a yoke part, and a return spring, a 90° boss in the opposite direction protrudes from the diagonal line of the long side of the first armature. There is a groove for placing permanent magnets at both ends; the first armature and the second armature have exactly the same structure and are mutually engaged in opposite directions; a pair of bosses of the second armature are magnetized into S poles; the first armature and the second armature are The left end of the push rod is clamped, and the right end of the push rod is connected to the return spring component and the valve core of the servo proportional valve. The yoke part includes a yoke frame and a control coil, the yoke frame includes two arms arranged in parallel, a connecting bridge is arranged between the upper end faces of the middle part of the two arms, and the control coil is installed in the middle of the connecting bridge, and the ends of the two arms The opposite sides of the yoke protrude to form two pairs of upper and lower symmetrical pole shoes; the control coil is completely symmetrical and equal along the path from the yoke frame to the four pole shoes; the armature part is installed on the four pole shoes of the yoke frame and the yoke frame is connected The interior of the three-dimensional space formed by the bridge road.

Description

High-frequency direct-acting force motor with symmetrical magnetic circuit

technical field

The utility model belongs to an electro-mechanical converter used for a servo proportional valve in the field of fluid transmission and control, in particular to a high-frequency direct-acting force motor with a symmetrical magnetic circuit.

Background technique

In electro-hydraulic control devices, electro-mechanical converter is a key component. Improving the frequency response and load capacity of the electro-mechanical converter is a prerequisite for improving the frequency response of the electro-hydraulic servo valve. The electro-mechanical converters currently used in electro-hydraulic control devices mainly include permanent magnet torque motors, moving coil force motors, proportional electromagnets and moving iron force motors.

Electromechanical converters for valves can be divided into two types: linear displacement type and angular displacement type according to the form of movable parts. According to the structure of movable parts, they can be divided into two types: movable iron type and movable coil type. The armature, the movable part of the latter is the control coil. Compared with the moving coil force motor, the moving iron force motor is more expensive, but has the advantages of small size, light weight and large output force, so it is widely used.

The function of the traditional proportional electromagnet is to convert the current signal output by the control amplifier into force or displacement proportionally, but due to its large size and can only provide one-way driving force for the servo proportional valve, the servo proportional valve needs to use Two proportional electromagnets are used to realize the commutation, which in turn increases the mass and inertia of the servo proportional valve, so the response speed is slow. Therefore, the traditional proportional electromagnet is not suitable for applications requiring fast dynamic response.

In order to develop a new type of high-frequency high-precision force motor, many experts, scholars and institutions at home and abroad have been researching this. For example, MOOG has developed a permanent magnet polarized bidirectional linear force motor for D633/D634 direct-acting electro-hydraulic servo valves. , adopts the structure type of single coil and double permanent magnet, and uses the differential drive mode of coil control magnetic field and radial permanent magnet polarized magnetic field to realize bidirectional control of force motor, which has the performance advantages of energy saving, reliability and low cost. However, the inertial link of the force motor is relatively cumbersome, so the response is relatively slow, the frequency response is generally not very high, and the problem of heating will occur in long-term work.

Under this background, a force motor with a new structure is proposed, which improves the shape of the yoke frame and the arrangement of the control coil, so that it has the characteristics of magnetic circuit symmetry and high frequency response.

SUMMARY OF THE INVENTION

In order to realize the output of the reciprocating force in the linear direction of the force motor used for the servo proportional valve, so that the force motor can output the pushing force and the pulling force, the utility model provides a force motor with high frequency response, symmetrical magnetic circuit and bidirectional output.

The technical scheme adopted by the utility model to solve its technical problems is:

A high-frequency direct-acting force motor with a symmetrical magnetic circuit, comprising an armature part, a yoke part, a return spring part, a front end cover, a first casing and a second casing; the armature part comprises a first armature and a second armature, A push rod, a first permanent magnet and a second permanent magnet, a 90° boss with opposite directions protrudes from the diagonal line of the long side of the first armature, and each end of the first armature has a rectangle There is an arc groove in the middle of the groove, the first permanent magnet and the second permanent magnet are radially magnetized into N-level and S-pole, and the rectangular grooves at both ends of the first armature are respectively The N pole faces of the first permanent magnet and the second permanent magnet are attached, and the first armature and a pair of bosses of the first armature are both magnetized into the N pole by the first permanent magnet and the second permanent magnet. The structure of the armature and the second armature are exactly the same, and they are mutually engaged in opposite directions. The rectangular grooves at both ends of the second armature are respectively fitted with the S pole surfaces of the first permanent magnet and the second permanent magnet, and the second armature and a pair of bosses of the second armature are both supported by the first permanent magnet , The second permanent magnet is magnetized to the S pole. The first armature and the second armature form an incomplete circular hole after the first permanent magnet and the second permanent magnet are installed, and the circular hole is used for installing the push rod. The combined circular hole of the first armature and the second armature clamps the part between the two shoulders of the left end of the push rod, the middle part of the push rod is installed in the linear bearing on the second shell, and the right end of the push rod Connect the return spring component, and the part of the right end of the push rod exposed from the front end cover is directly connected to the valve core of the servo proportional valve.

The yoke component includes a yoke frame and a control coil, the yoke frame includes a first arm and a second arm arranged in parallel, and a connecting bridge is spanned between the upper end faces of the middle of the two arms, and the connecting bridge is high. In the plane where the first arm and the second arm are located, the control coil is installed in the middle of the connecting bridge in the middle of the yoke frame, and the opposite sides of the ends of the two arms of the yoke frame protrude to form two pairs of upper and lower symmetrical pairs. Pole boots. The control coils are perfectly symmetrical and equal along the path of the yoke frame to the four pole pieces. The armature part is installed inside the three-dimensional space formed by the four pole pieces of the yoke frame and the connecting bridge of the yoke frame. At this time, a pair of bosses of the first armature are respectively connected with the upper pole piece at the left end of the yoke frame and the lower pole at the right end of the yoke frame. The pole piece forms the first working air gap and the third working air gap. The pair of bosses of the second armature and the lower pole piece at the left end of the yoke frame and the upper pole piece at the right end respectively form the second working air gap and the fourth working air gap. The first working air gap, the second working air gap, the third working air gap, and the fourth working air gap are completely equal in size when the power is not turned on. The yoke frame is installed in the square opening groove of the first shell.

Further, the return spring component includes a return spring, a first spring base, a second spring base and a second spring base limit ring, the first spring base is installed on the left end of the second housing, and the second spring base is installed In the annular groove at the left end of the front end cover, the second spring base limit ring is installed on the right end of the second spring base, the left end of the return spring is installed on the first spring base, and the right end of the return spring is installed on the first spring base. Two spring bases. The first spring base and the second spring base are not only limited by the second housing and the front end cover, but also limited by the two shaft shoulders of the push rod in the second housing part. The opening of the right end of the first shell is sealedly connected with the left end of the second shell, and the left end of the front end cover is sealed with the right end of the second shell.

Further, the front end cover, the push rod, the first spring base, the second spring base, the first casing and the second casing are all non-magnetic conductive bodies made of non-magnetic conductive materials; the yoke, the first armature and the The second armatures are all magnetic conductors made of soft magnetic materials.

The beneficial effects of the present utility model are mainly manifested in:

1. The spatial three-dimensional symmetry design of the yoke frame of the high-frequency direct-acting force motor makes it compact in structure, reasonable in installation and symmetrical in the magnetic circuit, so the control magnetic flux generated by the control coil in the middle is evenly distributed in the yoke frame, which can provide The same magnetic flux in the four working air gaps ensures that the force motor outputs the same force in both directions.

2. The armature part of the high-frequency direct-acting force motor has small moving inertia and compact structure. It makes full use of the space to assemble permanent magnets to increase the polarized magnetic flux, and realizes a new type of magnetic circuit design. The air gap surface area of the four axial working air gaps is large enough to ensure large axial output force and fast response.

3. The push rod of the high-frequency direct-acting force motor is directly connected to the valve core side of the servo proportional valve, which realizes the two-way linear control of the valve, with good dynamic performance and fast response speed.

Description of drawings

FIG. 1 is a schematic diagram of the structural principle of the present invention.

Figure 2a is a schematic structural diagram of the first armature of the present invention.

Figure 2b is a schematic diagram of the assembly of the first armature, the first permanent magnet and the second permanent magnet of the present invention.

Fig. 2c is a schematic diagram of the assembly of the first armature, the second armature, the first permanent magnet and the second permanent magnet of the present invention.

3 is a schematic diagram of the structure of the yoke of the present invention.

Fig. 4a(1), Fig. 4b(1), Fig. 4c(1), Fig. 4d(1) are the assembly schematic diagrams of the armature part and the yoke part, wherein:

Fig. 4a(2) is an enlarged view of the first working air gap δ1 of Fig. 4a( ₁ );

Fig. 4b( ₂ ) is an enlarged view of the second working air gap δ2 of Fig. 4b(1);

Fig. 4c(2) is an enlarged view of the _third working air gap δ3 of Fig. 4c(1);

Fig. 4d(2) is an enlarged view of the _fourth working air gap δ4 of Fig. 4d(1).

FIG. 5 is a schematic diagram of the working principle of the present invention, showing the magnetic flux inside the present invention when the control coil is not energized.

Figures 6(1) and 6(2) respectively show the magnetic flux inside the present invention when the control coil is in two energization directions.

Detailed ways

The present utility model will be described in detail below through examples.

1 to 6(2), a high-frequency direct-acting force motor includes an armature component, a yoke component, a return spring component, a front end cover 8, a first housing 1 and a second housing 9. The armature component It includes the first armature 11 and the second armature 12 , the push rod 7 , the first permanent magnet 14 and the second permanent magnet 15 . The diagonal of the long side of the first armature 11 protrudes a 90° opposite direction. A boss, two ends of the first armature 11 each have a rectangular groove, the first permanent magnet 14 and the second permanent magnet 15 are radially magnetized into N-level and S-pole, the first The rectangular grooves at both ends of the armature 11 are respectively fitted with the N pole faces of the first permanent magnet 14 and the second permanent magnet 15 , and the pair of bosses of the first armature 11 are supported by the first permanent magnet 14 and the second permanent magnet. 15 is magnetized to the N pole, and an arc-shaped slot is opened in the middle part of the first armature 11 . The first armature 11 and the second armature 12 have the same structure and are mutually engaged in opposite directions. The rectangular grooves at both ends of the second armature 12 are respectively fitted with the S pole surfaces of the first permanent magnet 14 and the second permanent magnet 15 , and the pair of bosses of the second armature 12 are supported by the first permanent magnets 14 and 15 , respectively. The second permanent magnet 15 is magnetized to the S pole. After the first permanent magnet 14 and the second permanent magnet 15 are respectively attached to the rectangular grooves of the first armature 11 and the second armature 12 , the arc-shaped groove in the middle of the first armature 11 and the second armature 12 The arc-shaped groove in the middle part forms an incomplete circular hole, the left end of the push rod 7 is clamped in the incomplete circular hole, and the two shaft shoulders on the left end of the push rod 7 are respectively clamped on the left and right sides of the armature part. At both ends, the middle part of the push rod 7 is installed in the linear bearing 10 which is an interference fit with the second housing 8, and the right end of the push rod 7 is installed with the first spring base 3 and the second spring base 5, the push rod 7 The right end of the rod 7 is directly connected to the valve core of the servo proportional valve from the protruding part of the right end of the second spring base limit ring 6 .

The yoke member includes a yoke frame 2 and a control coil 13. The yoke frame 2 includes a first arm 21 and a second arm 22 arranged in parallel, and a connecting bridge is arranged between the upper end faces of the middle of the two arms. 23. The connecting bridge 23 is higher than the plane where the first arm 21 and the second arm 22 are located, the control coil 13 is wound in the middle of the connecting bridge 23, and the opposite sides of the ends of the two arms of the yoke frame 2 protrude , forming two pairs of upper and lower symmetrical pole shoes. The path of the control coil 13 to the four pole pieces along the space structure of the yoke frame 2 is completely symmetrical and equal in space, the material is the same, the length is the same, so the magnetic resistance is also the same, so the control magnetic field generated by the control coil 13 is completely symmetrical and equal. The flux is evenly distributed in the magnetic circuit, and the magnetic flux to the axial working air gap of the four pole pieces is equal, and the output is equal to the force.

The armature component is installed inside the three-dimensional space formed by the four pole pieces of the yoke frame 2 and the connecting bridge 23 of the yoke frame 2. As shown in FIG. 4, a pair of bosses of the first armature 11 are respectively connected to The upper pole piece at the left end of the yoke frame 2 and the lower pole piece at the right end form the first working air gap δ ₁ and the third working air gap δ ₃ . A pair of bosses of the second armature 12 are respectively connected to the left end of the yoke frame 2 . The lower pole piece and the upper pole piece at the right end form the second working air gap δ ₂ , the fourth working air gap δ ₄ , the first working air gap δ ₁ , the second working air gap δ ₂ , and the third working air gap δ ₄ and the fourth working air gap δ ₄ are completely equal in size when no electricity is supplied. The yoke frame 2 is installed in the square opening groove of the first housing 1 .

The return spring component includes a return spring 4 , a first spring base 3 , a second spring base 5 and a second spring base limit ring 6 . The first spring base 3 is installed on the left end of the second housing 9, the second spring base 5 is installed in the annular groove on the left end of the front end cover 8, and the second spring base limit ring 6 is installed on the second spring The right end of the base 5, the left end of the return spring 4 is installed on the first spring base 3, the right end of the return spring 4 is installed on the second spring base 5, the first spring base 3 and the second spring base 5 In addition to being restricted by the second housing 9 and the front end cover 8 , the seat is also restricted by the two shoulders of the push rod 7 in the second housing 9 .

The opening of the right end of the first casing 1 is sealedly connected to the left end of the second casing 9 , and the left end of the front end cover 8 is sealedly connected to the right end of the second casing 9 .

working principle

As shown in Fig. 4a(1), Fig. 4b(1), Fig. 4c(1), Fig. 4d(1), the first armature 11, the second armature 12 and the yoke frame 2 respectively form four working air gaps δ ₁ , δ ₂ , δ ₃ , δ ₄ , when the control coil 13 is not energized, the working air gaps δ ₁ , δ ₂ , δ ₃ and δ ₄ are completely equal in size. The distribution of the polarization magnetic fluxes generated by the first permanent magnet 14 and the second permanent magnet 15 in the yoke frame and the armature parts is shown in FIG. A magnetic flux distribution in the armature 11, in which the dotted line part represents the magnetic flux distribution of the polarizing magnetic flux in the second armature 12, and the control coil 13 produces the distribution of the control magnetic flux in the yoke frame and the armature part Figure 6(1) 6 (2) shown by the solid line, wherein the dotted line part represents the magnetic flux distribution in the first armature 11, and the dotted line part represents the magnetic flux distribution in the second armature 12. When the control coil 13 does not pass current, in the working air gaps δ ₁ , δ ₂ , δ ₃ , and δ ₄ , only the polarized magnetic fluxes generated by the first permanent magnet 14 and the second permanent magnet 15 , the armature part is in the yoke In the middle position of the space formed by the four pole pieces in the frame 2, since the distribution of the polarized magnetic flux in the working air gaps δ ₁ , δ ₂ , δ ₃ , and δ ₄ is the same, the first armature 11 and the second armature 12 are affected by The magnetic attraction force is the same. At this time, the armature part of the high-frequency direct-acting force motor is in the neutral position, and there is no force output.

Let the position of the armature part shown in Fig. 5 be the initial position, when the direction of the current flowing into the control coil 13 is shown in Fig. 6(1), the current control magnetic flux and the permanent magnet polarized magnetic flux are in the working air gaps δ ₁ , δ . ₂ , δ ₃ , and δ ₄ are superimposed on each other. In the working air gaps δ ₁ and δ ₂ , the current control magnetic flux is opposite to the direction of the permanent magnet polarized magnetic flux, the magnetic flux strength is weakened, and the electromagnetic attraction force is reduced; in the working air gap δ _3. The current control magnetic flux in δ ₄ is in the same direction as the permanent magnet polarized magnetic flux, the magnetic flux strength is enhanced, and the electromagnetic attraction force is increased. At this time, the armature part is subjected to downward thrust, and as the displacement generated by the force gradually increases, the first spring base 3 compresses the return spring 4 under the action of the shaft shoulder of the push rod 7, and the elastic force of the return spring 4 gradually increases, and the direction is opposite to the thrust of the armature , the resultant force of the thrust and the elastic force of the return spring 4 gradually decreases to zero, the armature part reaches a new position balance, the return spring 4 is in a compressed state, and the working air gaps δ ₁ and δ ₂ increase by the same amount, and both increase to δ ₁ , , δ ₂ , and working air gaps δ ₃ , δ ₄ have the same reduction amount, both reduced to δ ₃ , δ ₄ , and the armature part is at the position shown in Figure 6(1). When the control coil 13 is powered off, the current control magnetic flux in the working air gaps δ ₁ , δ ₂ , δ ₃ , δ ₄ disappears, and the thrust on the armature part disappears. Under the action of the elastic force, the armature part returns to its original initial position, and the size of the working air gaps δ ₁ , δ ₂ , δ ₃ , δ ₄ , returns to δ ₁ , δ ₂ , δ ₃ , δ ₄ .

When the direction of the current flowing into the control coil 13 is shown in Figure 6(2), the current control magnetic flux and the permanent magnet polarized magnetic flux overlap each other in the working air gaps δ ₁ , δ ₂ , δ ₃ , and δ ₄ . Among them, in the working air gaps δ ₁ , δ ₂ the current-controlled magnetic flux is in the same direction as the permanent magnet polarized magnetic flux, the magnetic flux strength increases, and the electromagnetic attraction increases; in the working air gaps δ ₃ and δ ₄ , the current-controlled magnetic flux and the permanent The direction of the magnetic flux of the magnetic polarization is opposite, the intensity of the magnetic flux is weakened, and the electromagnetic attraction force is reduced. At this time, the armature part is pushed upward, and as the displacement generated by the force increases gradually, the second spring base 5 compresses the return spring 4 under the action of the shoulder of the push rod 7, and the elastic force of the return spring 4 gradually increases, and the direction is opposite to the thrust of the armature, The resultant force of the thrust and the elastic force of the return spring 4 gradually decreases to zero, the armature part reaches a new position balance again, the return spring 4 is in a compressed state, and the reductions of the working air gaps δ ₁ and δ ₂ are the same, and both decrease to δ ₁ ,,,δ ₂ ,,,The increase of the working air gaps δ ₃ and δ ₄ is the same, and both increase to δ ₃ ,,,δ ₄ ,,, and the armature part is as shown in Figure 6(2). Location. When the control coil 13 is powered off, the current control magnetic flux in the working air gap δ ₁ ,,,δ ₂ ,,,δ ₃ ,,,δ ₄ , disappears, and the thrust on the armature part disappears. Under the downward elastic force of the return spring 4, the armature part returns to the original initial position again, and the working air gap δ ₁ ,,,δ ₃ ,,,δ ₂ ,,,δ ₄ ,, The size of the working air gap returns to δ ₁ , δ ₂ , δ ₃ , δ ₄ .

It can be seen that the spatial structure design of the yoke frame satisfies the requirements well, and the paths from the control coil to the four pole pieces are completely symmetrical and equal. The control magnetic flux generated by the coil is evenly distributed in the magnetic circuit, and the magnetic flux to the axial working air gap of the four pole pieces is equal, no matter the direction of the current flowing into the control coil as shown in 6(1) or 6(2) , the input current is the same, and the same force can be output. Under the superposition of the current control magnetic flux and the permanent magnet polarized magnetic flux, by changing the energization method, the armature part will complete the specified movement in both directions, and achieve the reciprocating output of the force, thereby realizing the high-frequency precise control of the valve.

The content described in the embodiments of the present specification is only an enumeration of the realization forms of the concept of the utility model. The protection scope of the present invention should not be regarded as limited to the specific forms stated in the embodiments. The protection scope of the present invention also extends to Equivalent technical means that can be conceived by those skilled in the art according to the concept of the present invention.

Claims (3)

1. A high-frequency direct-acting force motor with a symmetrical magnetic circuit, characterized in that it includes an armature part, a yoke part, a return spring part, a front end cover, a first shell and a second shell, and the armature part includes a first armature and a second shell. The second armature, the push rod, the first permanent magnet and the second permanent magnet, a 90° boss in opposite directions protrudes from the diagonal of the long side of the first armature, and two ends of the first armature protrude Each has a rectangular groove, and there is an arc groove in the middle, the first permanent magnet and the second permanent magnet are radially magnetized into N-level and S-pole, and the rectangular grooves at both ends of the first armature. The slots are respectively fitted with the N pole faces of the first permanent magnet and the second permanent magnet, and the first armature and a pair of bosses of the first armature are both magnetized into the N pole by the first permanent magnet and the second permanent magnet, The structures of the first armature and the second armature are exactly the same, and they are mutually engaged in opposite directions; the rectangular grooves at both ends of the second armature are respectively fitted with the S pole faces of the first permanent magnet and the second permanent magnet, so The second armature and a pair of bosses of the second armature are both magnetized into an S pole by the first permanent magnet and the second permanent magnet; the first armature and the second armature are formed by installing the first permanent magnet and the second permanent magnet An incomplete circular hole, the circular hole is used to install the push rod; the combined circular hole of the first armature and the second armature clamps the part between the two shoulders at the left end of the push rod, and the middle part of the push rod is installed on the In the linear bearing on the second housing, the right end of the push rod is connected to the return spring component, and the part of the right end of the push rod exposed from the front end cover is directly connected to the valve core of the servo proportional valve; The yoke component includes a yoke frame and a control coil, the yoke frame includes a first arm and a second arm arranged in parallel, and a connecting bridge is spanned between the upper end faces of the middle of the two arms, and the connecting bridge is high. In the plane where the first arm and the second arm are located, the control coil is installed in the middle of the connecting bridge in the middle of the yoke frame, and the opposite sides of the ends of the two arms of the yoke frame protrude to form two pairs of upper and lower symmetrical pairs. pole shoes; the control coil is completely symmetrical and equal along the path from the yoke frame to the four pole shoes; the armature part is installed in the three-dimensional space formed by the four pole shoes of the yoke frame and the connecting bridge of the yoke frame, At this time, the pair of bosses of the first armature and the upper pole piece at the left end of the yoke frame and the lower pole piece at the right end respectively form the first working air gap and the third working air gap, and the pair of bosses of the second armature are respectively connected with the yoke The lower pole piece at the left end of the iron frame and the upper pole piece at the right end form the second working air gap and the fourth working air gap. The first working air gap, the second working air gap, the third working air gap and the fourth working air gap When the gap is not powered on, the size is exactly the same; the yoke frame is installed in the square opening slot of the first shell. 2. The high-frequency direct-acting force motor with symmetrical magnetic circuit according to claim 1, wherein the return spring component comprises a return spring, a first spring base, a second spring base and a second spring base limit The first spring base is installed at the left end of the second shell, the second spring base is installed in the annular groove at the left end of the front end cover, and the second spring base limit ring is installed at the right end of the second spring base , the left end of the return spring is installed on the first spring base, and the right end of the return spring is installed on the second spring base; the first spring base and the second spring base are limited by the second shell and the front end cover, It is also limited by the two shoulders of the push rod in the second housing part; the opening of the right end of the first housing is sealingly connected to the left end of the second housing, and the left end of the front end cover is sealingly connected to the right end of the second housing. 3. The high-frequency direct-acting force motor with symmetrical magnetic circuit as claimed in claim 1, wherein the front end cover, the push rod, the first spring base, the second spring base, the first shell and the second The shells are all non-magnetic conductive bodies made of non-magnetic conductive materials; the yoke, the first armature and the second armature are all magnetic conductive bodies made of soft magnetic materials.

Images