CN211127517U - High-frequency direct-acting type force motor based on mixed air gap - Google Patents
High-frequency direct-acting type force motor based on mixed air gap Download PDFInfo
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- CN211127517U CN211127517U CN201922247064.2U CN201922247064U CN211127517U CN 211127517 U CN211127517 U CN 211127517U CN 201922247064 U CN201922247064 U CN 201922247064U CN 211127517 U CN211127517 U CN 211127517U
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- 229910052742 iron Inorganic materials 0.000 claims abstract description 43
- 210000002832 Shoulder Anatomy 0.000 claims description 8
- 239000000696 magnetic material Substances 0.000 claims description 6
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- 230000004907 flux Effects 0.000 description 40
- 238000006073 displacement reaction Methods 0.000 description 28
- 230000000875 corresponding Effects 0.000 description 7
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- 230000002457 bidirectional Effects 0.000 description 4
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- 239000012530 fluid Substances 0.000 description 1
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Abstract
A high-frequency direct-acting force motor based on a mixed air gap comprises an armature part, a yoke part, a return spring part, a front end cover and a shell, wherein the armature part comprises a first armature, a second armature and a push rod, a boss with an opposite direction and an angle of 90 degrees protrudes from each diagonal line of a long edge of the armature, a connecting bridge circuit is spanned between two arms of a yoke iron frame of the yoke part, a control coil is installed in the middle of the connecting bridge circuit, and opposite sides of the end parts of the two arms of the yoke iron frame protrude to form four axial pole shoes which are symmetrical to each other; the control coils are completely symmetrical and equal along the path of the yoke iron frame to the four axial pole shoes; the armature part is arranged in a three-dimensional space formed by four axial pole shoes, four second radial pole shoes and a connecting bridge circuit of the yoke iron frame, and the yoke iron frame and bosses of the first armature and the second armature respectively form a first working air gap, a third working air gap, a second working air gap and a fourth working air gap in the axial direction; the four radial pole shoes of the armature part and the yoke part are in one-to-one correspondence to form a radial air gap.
Description
Technical Field
The utility model belongs to the electromechanical converter that servo proportional valve was used among fluid drive and the control field especially relates to a high frequency direct action formula force motor based on mix air gap.
Background
In an electro-hydraulic control device, an electro-mechanical converter is a key component. Increasing the frequency response and load carrying capability of an electro-mechanical converter is a prerequisite for increasing the frequency response of an 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.
The electromechanical converter for a valve is classified into a linear displacement type and an angular displacement type according to the form of a movable member, and classified into a moving iron type and a moving coil type according to the form of the movable member, the former being an armature, and the latter being a moving coil. The moving-iron type force motor has advantages of small size, light weight, and large output force, although it is more expensive than the moving-coil type force motor, and thus is increasingly used.
Because the traditional proportional electromagnet has a large volume and can only provide one-way driving force for the servo proportional valve, two proportional electromagnets are usually needed to realize the reversing of the servo proportional valve, so that the mass of the servo proportional valve is increased, the inertia is increased, and the response speed is slow. Therefore, the conventional proportional electromagnet is not suitable for the application occasions requiring quick dynamic response. However, due to the special structural design of the proportional electromagnet, a special magnetic circuit is formed, so that the basic suction characteristic, namely horizontal force-displacement characteristic, obtained by the proportional electromagnet is different from the suction characteristic of a common direct current electromagnet in principle.
The force motor is often used in the industrial field due to the advantage of large driving force, directly drives the valve core, and becomes the most widely applied electro-mechanical converter on a direct-acting electro-hydraulic servo valve. For example, MOOG develops a permanent magnetic polarized bidirectional linear force motor for a D633/D634 direct-acting electro-hydraulic servo valve, adopts a structural style of a single coil and double permanent magnets, and realizes bidirectional control of the force motor by using a differential driving mode of a coil control magnetic field and a radial permanent magnetic polarized magnetic field, thereby having the performance advantages of energy conservation, reliability, low cost and the like. The force motor is provided with a centering spring, so that power-off centering can be realized, and meanwhile, the centering spring also ensures that the valve core driving force output by the force motor is in direct proportion to the input current. The force motor has large output force, ensures that the servo valve can overcome hydrodynamic force and friction force, and improves the pollution resistance of the servo valve. However, the inertia link of the force motor is relatively heavy, so that the response is relatively slow, the frequency response is generally not very high, and the problem of heating can also occur in long-term operation.
Li Chipeng et al propose a novel high-voltage-resistant electromechanical converter on the basis of the analysis of unidirectional proportional electromagnets, and through the design of radial-to-length ratio selection, coil permanent magnet layout, analysis of soft magnetic materials and hard magnetic materials and the like, the friction force is reduced, the magnetic flux is improved, a method for improving the response speed is researched, the linear working range is +/-1 mm, the maximum driving force is +/-60N, the nonlinearity is less than 0.5%, the hysteresis loop is less than 2%, and the amplitude-frequency width reaches 160 Hz.
Liyong and the like summarize various methods for reducing power consumption based on function conversion relation and efficiency analysis of moving-iron type electro-mechanical converters, and provide two structures of a low-power-consumption high-voltage-resistant unidirectional proportional electromagnet and a low-power-consumption high-voltage-resistant bidirectional linear force motor, wherein the former adopts structural designs of stepped annular pole shoes, armatures and the like to form an axial working air gap and two radial working air gaps, the linear working stroke is 1.4mm, the nonlinearity is less than 4%, the hysteresis loop is less than 2%, the force dynamic response rise time is 47ms, the frequency response is 36Hz, the rated steady-state power consumption is 9.5W, and the steady-state coil temperature rise at room temperature is 42.5 ℃.
Benins et al propose a high frequency direct-acting force motor, which has the characteristics of high frequency response and large output force, but the unilateral arrangement of the control coil thereof enables the distances of working air gaps to be unequal at four places, thereby causing uneven magnetic circuit distribution, asymmetrical working air gap magnetic flux and different reciprocating output forces, which is a point needing important improvement. Meanwhile, the nonlinear relation between the current and the displacement is a general problem of a moving-iron type force motor, and if a special compensation method can be applied and a mixed air gap is added to improve a magnetic circuit, the force-displacement characteristic can be well improved.
On the basis, a high-frequency direct-acting type force motor based on a mixed air gap is provided, so that the high-frequency direct-acting type force motor has a horizontal force-displacement characteristic curve and realizes linear conversion of current-force-displacement.
Disclosure of Invention
In order to realize the linear conversion of current-force-displacement, the utility model provides a high-frequency response, magnetic circuit symmetry, have horizontal force-displacement characteristic curve's moving-iron formula force motor utilizes mixed air gap.
The utility model provides a technical scheme that its technical problem adopted is:
a high-frequency direct-acting type force motor based on a mixed air gap comprises an armature component, a yoke component, a return spring component, a front end cover and a shell, wherein the armature component comprises a first armature and a second armature, a push rod, a first permanent magnet and a second permanent magnet. The diagonal line of the long side of the first armature respectively protrudes with a boss with 90 degrees in opposite directions, and the outer side of the boss on the first armature is additionally provided with a vertical first radial pole shoe. The both ends of first armature respectively have a rectangular recess, and the centre has an circular arc recess, first permanent magnet, second permanent magnet are all radially magnetized into N level and S utmost point, laminate with the N utmost point face of first permanent magnet, second permanent magnet in the rectangular recess in first armature both ends respectively, a pair of boss of first armature and first armature is all by first permanent magnet, the magnetization of second permanent magnet becomes N extremely, first armature, second armature structure are the same completely, reverse mutual lock. The rectangular grooves at two ends of the second armature are respectively attached to S pole faces of the first permanent magnet and the second permanent magnet, and a pair of bosses of the second armature are magnetized into S pole faces by the first permanent magnet and the second permanent magnet. And an incomplete round hole is formed after the first permanent magnet and the second permanent magnet are arranged on the first armature and the second armature, and the round hole is used for installing a push rod.
The push rod is a shaft body, the axial direction is along the long axis direction, the radial direction is along the radius direction, and the circumferential direction is the circumferential direction. The combined round holes of the first armature and the second armature clamp the part between two shaft shoulders at the left end of the push rod, the middle part of the push rod is installed in a linear bearing on the second shell, the right end of the push rod is connected with a return spring component, and the part of the right end of the push rod exposed out of the front end cover is directly connected with a valve core of the servo proportional valve. The push rod is limited in radial movement and can move circumferentially, but the main function of the push rod is axial linear movement. The axial and radial judgment of other parts is based on the push rod shaft.
The yoke part comprises a yoke iron frame and a control coil and comprises a first arm and a second arm which are arranged in parallel, a connecting bridge is arranged between the upper end faces of the middle parts of the two arms in a spanning mode, the connecting bridge is higher than 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 iron frame, and the opposite sides of the end parts of the first arm and the second arm of the yoke iron frame protrude to form four axial pole shoes which are symmetrical to each other. The control coils are completely symmetrical and equal along the path of the yoke-iron frame to the four axial pole pieces. The armature component is arranged in a three-dimensional space formed by four axial pole shoes of the yoke iron frame, four additional second radial pole shoes and a connecting bridge circuit, a pair of bosses of the first armature respectively form a first working air gap and a third working air gap with an upper pole shoe at the left end of the yoke iron frame and a lower pole shoe at the right end of the yoke iron frame, a pair of bosses of the second armature respectively form a second working air gap and a fourth working air gap with the lower pole shoe at the left end of the yoke iron frame and the upper pole shoe at the right end of the yoke iron frame, and 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 under the condition of no electrification.
The four first radial pole shoes of the armature part and the four second radial pole shoes of the yoke part form radial air gaps in a one-to-one correspondence mode, and the size of the radial air gaps is constant when the armature part moves axially. In the axial direction, the four first radial pole shoes of the armature part and the four second radial pole shoes of the yoke part are just arranged in a staggered mode, and the second radial pole shoes on the yoke part are closer to the outer side.
Further, the reset spring component comprises a reset spring, a first spring base, a second spring base and a second spring base limiting ring; the shell comprises a first shell and a second shell, the return spring component is arranged in the second shell, and the armature component and the yoke component are arranged in the first shell; first spring base installs the left end at the second shell, second spring base installs in the annular groove of front end housing left end, second spring base spacing ring installs the right-hand member at second spring base, reset spring's left end is installed at first spring base, reset spring's right-hand member is installed at second spring base. The first spring mount and the second spring mount are constrained by two shoulders of the push rod in the second housing portion in addition to the second housing and the front end cap. The first shell right-hand member opening with second shell left end sealing connection, the left end of front end housing with the right-hand member sealing connection of second shell.
Furthermore, the front end cover, the push rod, the first spring base, the second spring base, the first shell and the second shell are all non-magnetizers made of non-magnetic materials; the yoke iron, the first armature iron and the second armature iron are all magnetizers made of soft magnetic materials.
The beneficial effects of the utility model are that:
1. according to the high-frequency direct-acting force motor based on the mixed air gap, radial pole shoes are additionally added on the side faces of a yoke iron frame and an armature iron component of the force motor on the main axial working air gap respectively to form a special compensation magnetic circuit, a gradually-descending force-displacement characteristic curve obtained by the radial pole shoes is compensated on a gradually-ascending force-displacement characteristic curve obtained by the axial pole shoes, and through the application of the mixed air gap, the force-displacement characteristic curve which is approximately horizontal in a working stroke is finally synthesized, so that the linear conversion of current-force-displacement is realized.
2. The symmetrical three-dimensional design of the first arm, the second arm and the connecting bridge circuit of the high-frequency direct-acting force motor yoke iron frame based on the mixed air gaps enables the high-frequency direct-acting force motor yoke iron frame to be compact in structure, reasonable in installation and symmetrical in magnetic circuit, so that control magnetic flux generated by the control coil in the middle is uniformly distributed in the yoke iron frame, the magnetic flux with the same four working air gaps can be provided, and the two-way output force of the force motor is guaranteed to be the same.
Drawings
Fig. 1 is a schematic view of the structural principle of the present invention.
Fig. 2a is a schematic structural diagram of a first armature according to the present invention.
Fig. 2b is an assembly schematic diagram of the first armature, the first permanent magnet and the second permanent magnet according to the present invention.
Fig. 2c is an assembly schematic diagram of the first armature, the second armature, the first permanent magnet and the second permanent magnet according to the present invention.
Fig. 3 is a schematic view of the yoke structure of the present invention.
Fig. 4 is a schematic view of the assembly of the armature component and the yoke component.
Fig. 5 is a schematic view of the working principle of the present invention, showing the whole magnetic flux situation inside the present invention when the control coil is not energized.
Fig. 5a is a partial enlarged view of the portion P of fig. 5.
Fig. 6(1), 6(2) show the internal magnetic circuit of the present invention when the control coil is in two current-carrying directions, respectively.
Detailed Description
The present invention will be specifically described below by way of examples.
Referring to fig. 1 to 6(2), the utility model provides a high frequency direct action type force motor based on mix air gap, including armature part, yoke part, reset spring part, front end housing 8, first shell 1 and second shell 9, armature part includes first armature 11 and second armature 12, push rod 7, first permanent magnet 14 and second permanent magnet 15, respectively protrude a 90 boss of opposite direction on the diagonal of the long limit of first armature 11, the boss outside on the first armature 11 adds separately and has a vertical first radial pole shoe 16. The both ends of first armature 11 respectively have a rectangular recess, first permanent magnet 14, second permanent magnet 15 are all by radial magnetizing N level and S utmost point, the rectangular recess in first armature 11 both ends is laminated with the N utmost point face of first permanent magnet 14, second permanent magnet 15 respectively, a pair of boss of first armature 11 is magnetized into the N utmost point by first permanent magnet 14, second permanent magnet 15, the middle part of first armature 11 is opened has a convex groove. The first armature 11 and the second armature 12 have the same structure and are buckled with each other in opposite directions. Rectangular grooves at two ends of the second armature 12 are respectively attached to S pole faces of the first permanent magnet 14 and the second permanent magnet 15, and a pair of bosses of the second armature 12 are magnetized into S pole faces by the first permanent magnet 14 and the second permanent magnet 15. After the rectangular grooves of the first armature 11 and the second armature 12 are respectively attached with the first permanent magnet 14 and the second permanent magnet 15, the circular arc-shaped groove in the middle of the first armature 11 and the circular arc-shaped groove in the middle of the second armature 12 form an incomplete round hole, and the incomplete round hole is used for installing the push rod 7.
The push rod 7 is a shaft body, and is axial along the long axis direction, radial along the radius direction, and circumferential along the circumference direction. Two shaft shoulders at the left end of the push rod 7 are respectively clamped at the left end and the right end of the armature component, the middle part of the push rod 7 is installed in a linear bearing 10 in interference fit with the second shell 8, the right end of the push rod 7 is provided with a first spring base 3 and a second spring base 5, and the right end of the push rod 7 is directly connected with a valve core of the servo proportional valve from the protruding part of the right end of the second spring base limiting ring 6. The push rod 7 is limited in radial movement and can move circumferentially, but mainly acts in an axial linear movement. The axial and radial judgment of other parts is based on the push rod shaft.
The yoke part comprises a yoke frame 2 and a control coil 13, the yoke frame 2 comprises a first arm 21 and a second arm 22 which are arranged in parallel, a connecting bridge 23 is arranged between the upper end faces of the middle parts of the two arms in a spanning mode, the connecting bridge 23 is higher than the plane of the first arm 21 and the plane of the second arm 22, the control coil 13 is wound in the middle of the connecting bridge 23, opposite sides of the end parts of the first arm 21 and the second arm 22 of the yoke frame 2 are protruded to form four axial pole shoes which are symmetrical to each other, and two pairs of vertical second radial pole shoes 24 which are symmetrical to each other are additionally protruded on the opposite sides of the inner parts of the pole shoes at the two ends of the first arm 21 and the second arm 22 of the yoke frame 2. The paths from the control coil 13 to the four axial pole shoes along the space structure of the yoke iron frame 2 are completely symmetrical and equal in space, and the yoke iron frames 2 are made of the same material and have the same length, so that the magnetic resistances are completely the same, and therefore, the control magnetic flux generated by the control coil 13 is uniformly distributed in a magnetic circuit, the magnetic flux to the working air gaps of the four axial pole shoes is equal, and the same force is output. The yoke iron frame 2 is installed in a square opening groove of the first housing 1.
The armature member is installed in an inner space formed by four axial pole pieces of the yoke frame 2 and four additional second radial pole pieces 24, as shown in fig. 4, a pair of bosses of the first armature 11 respectively form a first working air gap with an upper pole piece at the left end and a lower pole piece at the right end of the yoke frame 2 at this time1A third working air gap3A pair of bosses of the second armature 12 respectively form a second working air gap with a lower pole shoe at the left end and an upper pole shoe at the right end of the yoke frame 22A fourth working air gap4Said first working air gap1A second working air gap2A third working air gap4A fourth working air gap4In the case of no power, the magnitudes are exactly equal.
As shown in fig. 5, the four additional first radial pole pieces 16 of the armature member and the four additional second radial pole pieces 24 of the yoke member form a radial air gap in a one-to-one correspondence, and the radial air gap is constant in size when the armature member moves axially. In the axial direction, the four first radial pole pieces 16 of the armature part are arranged offset from the four second radial pole pieces 24 of the yoke part, and the second radial pole pieces 24 of the yoke part are arranged closer to the outside, so that a specially improved magnetic circuit is formed.
The reset spring component comprises a reset spring 4, a first spring base 3, a second spring base 5 and a second spring base limiting ring 6. First spring holder 3 installs the left end at second shell 9, second spring holder 5 installs in the annular groove of 8 left ends in the front end housing, second spring holder spacing ring 6 installs the right-hand member at second spring holder 5, the left end of reset spring 4 is installed at first spring holder 3, the right-hand member of reset spring 4 is installed at second spring holder 5, first spring holder 3 with second spring holder 5 is except that by second shell 9 and front end housing 8 restriction, also by the restriction of the two shoulders of push rod 7 in second shell 9 position.
The opening at the right end of the first shell 1 is hermetically connected with the left end of the second shell 9, and the left end of the front end cover 8 is hermetically connected with the right end of the second shell 9.
Principle of operation
As shown in fig. 4, the first armature 11, the second armature 12 and the yoke 2 form four working air gaps1、2、3、4When the control coil 13 is not energized, the working air gap1、2、3And4the sizes are completely equal. The distribution of the polarized magnetic fluxes generated by the first permanent magnet 14, the second permanent magnet 15 in the yoke and the armature member is shown in fig. 5, in which the solid line portion indicates the distribution of the main polarized magnetic flux path in the yoke 2 and the first armature 11, and the dotted line portion indicates the distribution of the main polarized magnetic flux path in the second armature 12. Because the four first radial pole pieces 16 of the armature part and the four second radial pole pieces 24 of the yoke part form radial air gaps in staggered arrangement in a one-to-one correspondence mode, four additional compensation magnetic circuits are separated from a main magnetic circuit, the distance between two magnetic pole faces of the radial air gaps is constant along with the axial movement of the armature part, but the relative sizes of the superposed parts and the exposed parts of the magnetic pole faces of the air gaps of the first radial pole pieces 16 and the second radial pole pieces 24 are changed, and the corresponding air gap magnetic resistance and the magnetic flux are changed. As shown in the enlarged portion of fig. 5, the meandering additional compensating magnetic circuit can provide electromagnetic force in both axial and radial directions simultaneously according to the principle of minimum magnetic resistance or the principle of minimum magnetic circuit, so that it has a tendency that magnetic resistance becomes smaller and magnetic circuit becomes shorter. If the area of the overlapped part of the magnetic pole faces of the radial air gap is increased, the magnetic circuit is straightened by bending and shortened, the magnetic resistance is reduced, the tendency of the magnetic circuit to be shortened is reduced, so that the additional electromagnetic force in the axial direction is reduced, and the electromagnetic force in the radial direction is increased no matter how muchAre less likely to cancel each other out due to the symmetrical arrangement of the radial air gap on the force motor. The additional electromagnetic force in the axial direction generated by the radial air gap will compensate the electromagnetic force of the four axial air gaps. The force-displacement characteristic curve of the axial air gap is gradually increased, the force-displacement characteristic curve of the radial air gap is gradually decreased, and the finally synthesized force-displacement characteristic curve is nearly horizontal in the working stroke, so that the linear conversion of current-force-displacement is realized.
As shown in fig. 6(1), 6(2), in which the solid line portion indicates the magnetic flux distribution in the yoke iron frame, in which the dotted line portion indicates the magnetic flux distribution in the first armature 11, and in which the dotted line portion indicates the magnetic flux distribution in the second armature 12. When the control coil 13 is not energized, the air gap is in the working air1、2、3、4In the armature part, only polarized magnetic flux generated by the first permanent magnet 14 and the second permanent magnet 15 is in the middle position of a space formed by four axial pole shoes and four second radial pole shoes 24 in the yoke 2, and the polarized magnetic flux is in a working air gap1、2、3、4The internal distribution amount is the same, and the distribution amount in the radial air gap is also the same, so the magnetic attraction force borne by the first armature 11 and the second armature 12 is the same, and at the moment, the armature component of the high-frequency direct-acting type force motor is in a middle position and has no force output.
When the armature member shown in fig. 5 is located at the initial position, when the control coil 13 is energized, the control magnetic flux generated by the control coil 13 is equal at four axial air gaps and four radial air gaps due to the spatially symmetrical magnetic circuit design of the yoke iron frame, so that the magnitude of the axial bidirectional output force is completely the same. When the control coil 13 is energized with current in the direction shown in fig. 6(1), the current control magnetic flux and the permanent magnet polarized magnetic flux are in the working air gap1、2、3、4Mutually overlapping, wherein in the working air gap1、2The direction of the internal current control magnetic flux is opposite to that of the permanent magnetic polarization magnetic flux, the intensity of the magnetic flux is weakened, and the electromagnetic force is reduced; at the working air gap3、4The direction of the internal current control magnetic flux is the same as that of the permanent magnetic polarization magnetic flux, the intensity of the magnetic flux is enhanced, and the electromagnetic force is increased. At this time, it is engagedThe iron part is subjected to axial downward thrust, the first spring base 3 compresses the return spring 4 under the action of the shaft shoulder of the push rod 7 along with the gradual increase of the displacement generated by the force, the elastic force of the return spring 4 is gradually increased, the direction is opposite to the armature thrust, the resultant force of the thrust and the elastic force of the return spring 4 is gradually reduced to zero, the armature part reaches new position balance, the return spring 4 is in a compression state, and a working air gap is formed between the return spring 4 and the armature part1、2Are all increased to'1、'2Working air gap3、4Are reduced to'3、'4With the armature member in the position shown in fig. 6 (1).
During the axial downward movement, the more downward the displacement, the air gap3、4The smaller the magnetic flux, the greater the electromagnetic force, and the air gap1、2The larger the magnetic flux weakens, where the electromagnetic force is smaller. Therefore, the total axial downward electromagnetic force applied to the axial pole shoe during the working stroke is gradually increased. At this time, during the gradual downward displacement, the air gap3、4The overlapping area of the magnetic pole surfaces of the radial air gaps nearby is increased, the additional electromagnetic force applied by the axial downward direction is reduced according to the principle of shortest magnetic path, and the air gaps1、2The overlapping area of the magnetic pole surfaces of the radial air gaps near the position is reduced, and the additional electromagnetic force applied to the magnetic pole surfaces in the axial direction is increased. Under the electromagnetic force compensation of the radial air gap, the total electromagnetic force is approximately unchanged along with the change of the displacement, and corresponding force and displacement can be generated by inputting corresponding current.
When the control coil 13 is de-energized, an air gap is active at this time'1、'2、'3、'4The current control magnetic flux in the current control magnetic circuit disappears, the thrust borne by the armature component disappears, and the armature component returns to the original initial position and the working air gap 'under the action of the upward elastic force of the return spring 4'1、'2、'3、'4Is restored to1、2、3、4。
When the control coil 13 is energized with current in the direction shown in fig. 6(2), the current control magnetic flux and the permanent magnet polarized magnetic fluxThrough the working air gap1、2、3、4The inner sides are superposed with each other. Wherein in the working air gap1、2The direction of the internal current control magnetic flux is the same as that of the permanent magnetic polarization magnetic flux, the magnetic flux strength is enhanced, and the electromagnetic force is increased; at the working air gap3、4The direction of the internal current control magnetic flux is opposite to that of the permanent magnetic polarization magnetic flux, the intensity of the magnetic flux is weakened, and the electromagnetic force is reduced. At the moment, the armature component bears the thrust in the axial direction, the displacement generated along with the force is gradually increased, the second spring base 5 compresses the return spring 4 under the action of the shaft shoulder of the push rod 7, the elastic force of the return spring 4 is gradually increased, the direction is opposite to the armature thrust, the resultant force of the thrust and the elastic force of the return spring 4 is gradually reduced to zero, the armature component reaches the new position balance again, the return spring 4 is in a compression state, and the working air gap is formed between the armature component and the return spring 41、2Are the same, all reduce to "1、”2Working air gap3、4Are the same, all increase to "3、”4With the armature member in the position shown in fig. 6 (2).
During the upward axial movement, the more upward the displacement, the air gap3、4The larger the magnetic flux, the smaller the electromagnetic force, and the air gap1、2The smaller the magnetic flux increases, where the electromagnetic force is greater. Therefore, the total axial upward electromagnetic force applied to the axial pole shoe during the working stroke is gradually increased. At this time, during the gradual upward displacement, the air gap3、4The overlapping area of the magnetic pole surfaces of the radial air gaps nearby is reduced, the additional electromagnetic force applied axially downwards is increased according to the principle of shortest magnetic circuit, and the air gaps1、2The overlapping area of the magnetic pole surfaces of the radial air gaps near the position is increased, and the additional electromagnetic force applied to the magnetic pole surfaces in the axial direction is reduced. Under the electromagnetic force compensation of the radial air gap, the total electromagnetic force is approximately unchanged along with the change of the displacement, and corresponding force and displacement can be generated by inputting corresponding current.
When the control coil 13 is de-energized, the working air gap at this time "1、”2、”3、”4The current in the current control magnetic flux disappears,the thrust force borne by the armature component disappears, and under the action of the downward elastic force of the reset spring 4, the armature component returns to the original initial position again, namely a working air gap "1、”3、”2、”4Is restored to1、2、3、4。
Under the mutual superposition of current control magnetic flux and permanent magnetic polarization magnetic flux and the combined action of mixed air gaps, corresponding force and displacement can be generated by changing the electrifying mode and inputting corresponding current, and the armature component can complete specified movement, so that the high-frequency accurate control of the servo proportional valve is realized.
The embodiments described in this specification are merely illustrative of implementations of the inventive concepts, and the scope of the invention should not be considered limited to the specific forms set forth in the embodiments, but rather the scope of the invention is intended to include equivalent technical means as would be understood by those skilled in the art from the inventive concepts.
Claims (3)
1. The utility model provides a high frequency direct action type force motor based on mix air gap, includes armature part, yoke part, reset spring part, front end housing, shell, its characterized in that: the armature component comprises a first armature, a second armature, a push rod, a first permanent magnet and a second permanent magnet; the diagonal line of the long side of the first armature is respectively provided with a boss which is opposite in direction and is 90 degrees in projection, and the outer sides of the bosses on the first armature are respectively additionally provided with a vertical first radial pole shoe; the two ends of the first armature are respectively provided with a rectangular groove, the middle of the first armature is provided with an arc groove, the first permanent magnet and the second permanent magnet are radially magnetized into an N-level and an S-level, the rectangular grooves at the two ends of the first armature are respectively attached to the N-level surfaces of the first permanent magnet and the second permanent magnet, a pair of bosses of the first armature and a pair of bosses of the first armature are respectively magnetized into N-level ends by the first permanent magnet and the second permanent magnet, the first armature and the second armature are completely identical in structure and are reversely buckled with each other; the rectangular grooves at two ends of the second armature are respectively attached to S pole surfaces of the first permanent magnet and the second permanent magnet, and a pair of bosses of the second armature are magnetized into S pole surfaces by the first permanent magnet and the second permanent magnet; the first armature and the second armature are provided with a first permanent magnet and a second permanent magnet to form an incomplete round hole, and the round hole is used for mounting a push rod;
the push rod is a shaft body, the axial direction is along the long axis direction, the radial direction is along the radius direction, and the circumferential direction is the circumferential direction; the combined round holes of the first armature and the second armature clamp the part between two shaft shoulders at the left end of the push rod, the middle part of the push rod is arranged in a linear bearing on the second shell, the right end of the push rod is connected with a return spring component, and the part of the right end of the push rod exposed out of the front end cover is directly connected with a valve core of the servo proportional valve; the push rod is limited to move radially and can move circumferentially, but the main function of the push rod is to do axial linear motion; the axial and radial judgment of other parts is based on the push rod shaft;
the yoke part comprises a yoke iron frame and a control coil and comprises a first arm and a second arm which are arranged in parallel, a connecting bridge is arranged between the upper end faces of the middle parts of the two arms in a spanning mode, the connecting bridge is higher than the plane where the first arm and the second arm are located, the control coil is arranged in the middle of the connecting bridge in the middle of the yoke iron frame, and the opposite sides of the end parts of the first arm and the second arm of the yoke iron frame protrude to form four axial pole shoes which are symmetrical to each other; the control coils are completely symmetrical and equal along the path of the yoke iron frame to the four axial pole shoes; the armature part is arranged in a three-dimensional space formed by four axial pole shoes, four second radial pole shoes and a connecting bridge circuit of the yoke iron frame, a pair of bosses of the first armature respectively form a first working air gap and a third working air gap with an upper pole shoe at the left end and a lower pole shoe at the right end of the yoke iron frame, a pair of bosses of the second armature respectively form a second working air gap and a fourth working air gap with the lower pole shoe at the left end and the upper pole shoe at the right end of the yoke iron frame, and 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 under the condition of no electrification;
the four first radial pole shoes of the armature part and the four second radial pole shoes of the yoke part form radial air gaps in a one-to-one correspondence mode, and the size of the radial air gaps is constant when the armature part moves axially; in the axial direction, the four first radial pole shoes of the armature part and the four second radial pole shoes of the yoke part are just arranged in a staggered mode, and the second radial pole shoes on the yoke part are closer to the outer side.
2. The hybrid air gap-based high frequency direct-acting force motor of claim 1, wherein: the reset spring component comprises a reset spring, a first spring base, a second spring base and a second spring base limiting ring; the shell comprises a first shell and a second shell, the return spring component is arranged in the second shell, and the armature component and the yoke component are arranged in the first shell; the first spring base is installed at the left end of the second shell, the second spring base is installed in an annular groove at the left end of the front end cover, the second spring base limiting ring is installed at the right end of the second spring base, the left end of the reset spring is installed at the first spring base, and the right end of the reset spring is installed at the second spring base; the first spring base and the second spring base are limited by two shaft shoulders of the push rod in the second shell part besides the second shell and the front end cover; the first shell right-hand member opening with second shell left end sealing connection, the left end of front end housing with the right-hand member sealing connection of second shell.
3. The hybrid air gap-based high frequency direct-acting force motor of claim 1, wherein: the front end cover, the push rod, the first spring base, the second spring base, the first shell and the second shell are all non-magnetizers made of non-magnetic materials; the yoke iron, the first armature iron and the second armature iron are all magnetizers made of soft magnetic materials.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201922247064.2U CN211127517U (en) | 2019-12-13 | 2019-12-13 | High-frequency direct-acting type force motor based on mixed air gap |
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| CN201922247064.2U CN211127517U (en) | 2019-12-13 | 2019-12-13 | High-frequency direct-acting type force motor based on mixed air gap |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113809873A (en) * | 2021-08-30 | 2021-12-17 | 浙江工业大学 | Basin-shaped tooth type high-frequency direct-drive motor based on air gap compensation |
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2019
- 2019-12-13 CN CN201922247064.2U patent/CN211127517U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113809873A (en) * | 2021-08-30 | 2021-12-17 | 浙江工业大学 | Basin-shaped tooth type high-frequency direct-drive motor based on air gap compensation |
| CN113809873B (en) * | 2021-08-30 | 2022-09-13 | 浙江工业大学 | Basin-shaped tooth type high-frequency direct-drive motor based on air gap compensation |
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