CN215817863U - Moving magnet type reciprocating linear oscillation motor of cryogenic refrigerator - Google Patents
Moving magnet type reciprocating linear oscillation motor of cryogenic refrigerator Download PDFInfo
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- CN215817863U CN215817863U CN202122251256.8U CN202122251256U CN215817863U CN 215817863 U CN215817863 U CN 215817863U CN 202122251256 U CN202122251256 U CN 202122251256U CN 215817863 U CN215817863 U CN 215817863U
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- magnetic steel
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- 230000010355 oscillation Effects 0.000 title claims abstract description 12
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 45
- 239000010959 steel Substances 0.000 claims abstract description 45
- 238000004804 winding Methods 0.000 claims abstract description 30
- 230000007246 mechanism Effects 0.000 claims abstract description 14
- 229910000976 Electrical steel Inorganic materials 0.000 claims description 3
- 239000003292 glue Substances 0.000 claims description 3
- 230000005415 magnetization Effects 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 3
- VQAPWLAUGBBGJI-UHFFFAOYSA-N [B].[Fe].[Rb] Chemical compound [B].[Fe].[Rb] VQAPWLAUGBBGJI-UHFFFAOYSA-N 0.000 claims description 2
- 239000000696 magnetic material Substances 0.000 claims description 2
- 238000012856 packing Methods 0.000 claims 2
- 229910052573 porcelain Inorganic materials 0.000 claims 1
- 238000000034 method Methods 0.000 abstract description 5
- 239000000919 ceramic Substances 0.000 abstract description 4
- 230000008569 process Effects 0.000 abstract description 3
- 238000005299 abrasion Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
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Abstract
The utility model provides a moving magnet type reciprocating linear oscillation motor of a low-temperature refrigerator, which comprises an inner stator, an outer stator and a rotor, wherein the outer stator is provided with an elastic limiting mechanism; a circle of groove is arranged on the outer diameter of the inner stator, and a coil winding is arranged in the groove; the rotor comprises a rotor support and magnetic steel arranged on the rotor support, the rotor support is composed of an upper magnetic steel support plate, a magnetic steel connecting ring and a lower magnetic steel short gasket, the magnetic steel support plate is fixedly arranged on the upper end face of the magnetic steel connecting ring, the magnetic steel support plate is connected with the elastic limiting mechanism through a connecting piece, and the magnetic steel is made of magnets of a multi-piece ceramic tile structure. The utility model has the advantages that: 1. the structure of the outer stator is simplified, a special outer stator winding slot is omitted, the cost is reduced, and the winding process is simpler and more convenient; 2. the coil does not occupy the radial space, so the diameter of the magnetic steel can be made as large as possible, the magnetic energy is stronger, the motor thrust is larger, and the magnetic motor is suitable for high-power compressors and refrigerators.
Description
Technical Field
The utility model relates to a low-temperature refrigerator, in particular to a moving magnet type reciprocating linear oscillating motor of the low-temperature refrigerator, which is suitable for a Stirling refrigerator and a pulse tube refrigerator.
Background
With the progress of science and technology, the low-temperature refrigerator is widely applied in the field of military and civilian, and the working performance of the reciprocating compressor which is used as the driving device of the refrigerator directly influences the operating power, the service life and the reliability of the refrigerator.
The reciprocating compressor may be classified into a rotary motor drive and a reciprocating linear oscillation motor drive according to a driving manner of a motor thereof. In the early stage, the rotary motor-driven compressor is frequently used, the crank-connecting rod mechanism of the compressor is easy to wear, the structure is complex, the vibration noise is large, and the operation efficiency and the service life of the compressor are not ideal. The development of the linear motor solves the problems of the rotary motor, meets the requirements of long service life, high efficiency and high reliability of the compressor, and is widely applied to the compressor and the refrigerating machine as an ideal machine type.
The conventional linear motor mainly has two structures of a moving magnet type motor and a moving coil type motor. The moving magnet type linear oscillating motor is a linear motor taking a permanent magnet as a moving part, and compared with a moving coil type linear oscillating motor, the moving magnet type linear oscillating motor has the advantages of small rotor mass, large thrust, simple structure, high efficiency, long service life and the like. With the research and development of permanent magnet materials, the advantages of the moving magnet type motor are more and more obvious.
Present common moving magnetic formula linear electric motor drive compressor has adopted the direct motor structure of winding excitation coil on outer stator external diameter, and this not only needs to add special wire winding groove, makes the wire winding process complicated, still can make the thickness increase of outer stator, and the structure is complicated, the processing degree of difficulty grow to manufacturing cost has been improved. In addition, if the motor structure is adopted, the diameter of the magnetic steel is reduced, so that the magnetic energy and the motor thrust are reduced, and the motor structure is not suitable for high-power compressors and refrigerators.
SUMMERY OF THE UTILITY MODEL
The utility model provides a novel moving magnet type reciprocating linear motor design, wherein a coil is wound in an inner stator, so that the outer stator is simple in structure, the diameter of magnetic steel is increased, larger motor thrust is obtained, a compressor and a refrigerator with larger power are favorably manufactured, and the moving magnet type reciprocating linear motor has more advantages in winding process and cost; the linear motor structure overcomes the defects of low power, difficult processing technology, high manufacturing cost and the like, thereby solving the problems in the prior art. The specific scheme is as follows:
a moving magnet type reciprocating linear oscillating motor of a low-temperature refrigerator comprises an outer stator, a rotor and an inner stator, wherein the rotor is arranged in an annular gap formed after the inner stator and the outer stator are coaxially assembled,
the outer stator is axially placed and fixed between the upper support and the lower support, the lower end face of the lower support is tightly attached to the air cylinder seat and connected with the machine base, and the upper end face of the upper support is provided with an elastic limiting mechanism;
the lower end of the inner stator is fixed on the cylinder seat, a circle of groove is formed in the outer diameter of the inner stator along the circumferential direction, a coil winding is arranged in the groove, and the outer surface of the coil winding is lower than the outer diameter surface of the inner stator;
the rotor comprises a rotor support and magnetic steel arranged on the rotor support, the rotor support is composed of an upper magnetic steel support plate, a magnetic steel connecting ring and a lower magnetic steel short gasket, the magnetic steel support plate is fixedly arranged on the upper end face of the magnetic steel connecting ring, the magnetic steel support plate is connected with the elastic limiting mechanism through a connecting piece, the magnetic steel is made of magnets of a multi-piece ceramic tile structure, and after radial magnetization is adopted, N, S-level alternate arrangement is fixed between the upper magnetic steel connecting ring and the lower magnetic steel short gasket and is located in the annular gap.
Further, the magnet is a rubidium iron boron magnet.
Furthermore, the rotor support is made of a non-magnetic material.
Further, the outer stator is made of several pieces of silicon steel sheet or SMC material.
Furthermore, the coil winding adopts a single-phase winding with each layer wound for 25-30 circles, so that the resistance value of the motor is ensured to be more than 0.91 omega.
Further, the outer surface of the coil winding is covered with insulating glue.
Furthermore, the elastic limiting mechanism is a plate spring.
The utility model has the advantages that:
1. the coil is wound in the groove of the outer diameter of the inner stator, so that the structure of the outer stator can be simplified, a special outer stator winding groove is omitted, and the cost is reduced;
2. the coil is wound in the groove of the inner stator, so that the coil does not occupy radial space, the diameter of the magnetic steel can be made as large as possible, the magnetic energy is stronger, the motor thrust is larger, and the magnetic steel is suitable for a high-power compressor and a refrigerating machine;
3. the elastic limiting mechanism can ensure that the rotor does not deviate from the central shaft when doing reciprocating linear motion, thereby playing an axial limiting role on the rotor and avoiding abrasion;
4. the coupling and assembling structure of the motor and the compressor is simpler and more compact.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
FIG. 1 is a structural diagram of a moving-magnet type reciprocating linear oscillation motor according to the present invention;
FIG. 2 is an internal cross-sectional view of the present invention;
fig. 3 is a schematic view of a section of groove formed in the middle of the inner stator.
Detailed Description
In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present invention. It will be apparent, however, to one skilled in the art, that the present invention may be practiced without one or more of these specific details. In other instances, well-known features have not been described in order to avoid obscuring the utility model.
In the following description, for the purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The following detailed description of the preferred embodiments of the utility model, however, the utility model is capable of other embodiments in addition to those detailed.
Referring to fig. 1, the present invention provides a moving-magnet type reciprocating linear oscillating motor of a cryogenic refrigerator, the moving-magnet type reciprocating linear oscillating motor includes an outer stator 1, a mover 2 and an inner stator 3, the mover 2 needs to be placed in an annular gap formed after the inner stator 3 and the outer stator 1 are coaxially assembled by means of an inner and outer stator centering tool, radial non-contact between the mover 2 and the outer stator 1 and the inner stator 3 is ensured, and the radial gap distance between the mover 2 and the outer stator 1 and the inner stator 3 is maintained at about 1 mm.
With further reference to fig. 2-3, the structure of the outer stator 1, the mover 2 and the inner stator 3 will be further explained.
The outer stator 1 is made of a plurality of silicon steel sheets or SMC (high-performance iron-based soft magnetic composite materials), is axially placed and fixed between the upper support 4 and the lower support 5, the lower end of the lower support 5 is tightly attached to the cylinder seat and integrally connected with the machine seat, and the upper end face of the upper support 4 is fixedly provided with an elastic limiting mechanism 11.
The lower end of the inner stator 3 is fixed on a cylinder seat, a circle of groove 31 is formed in the outer diameter of the inner stator 3 along the circumferential direction, a coil winding 10 is arranged in the groove 31, and the outer surface of the coil winding 10 is lower than the outer diameter surface of the inner stator 3.
The mover 2 includes a mover support 21 and a magnetic steel 8 mounted on the mover support 21. The rotor support 21 is processed into a cylinder shape by adopting a non-magnetic conductive material, and consists of an upper magnetic steel support plate 6, a magnetic steel connecting ring 7 and a lower magnetic steel short washer 9, the magnetic steel support plate 6 is fixedly arranged on the upper end surface of the magnetic steel connecting ring 7, and the magnetic steel support plate 6 is connected with the elastic limiting mechanism 11 through a connecting piece 12. The magnetic steel 8 is made of a plurality of magnets with ceramic tile structures, and after radial magnetization, N, S-level alternate arrangement is fixed between the upper magnetic steel connecting ring 7 and the lower magnetic steel short washer 9 and is positioned in an annular gap between the inner stator and the outer stator.
The reciprocating linear oscillation motor of current cryocooler's moving-magnet formula is limited by structural constraint, and outer stator wall thickness is thinner, consequently can't excavate the wire winding groove on outer stator, only can be with the coil winding on outer stator external diameter, must make radial occupation space increase so for outer stator structure is more complicated. Based on the premise of a thicker mechanism of the inner stator, the utility model is provided with a section of groove in the middle of the outer diameter of the inner stator for winding the coil winding, and the coil winding does not occupy radial space, thereby the diameter of the magnetic steel can be made as large as possible, the magnetic energy is stronger, the motor thrust is larger, and the utility model is suitable for high-power compressors and refrigerators. In addition, the magnetic steel 8 adopts a magnet with a multi-piece ceramic tile structure, so that the eccentric magnetic force is effectively reduced, and the difficulty and the manufacturing cost of the processing technology are reduced.
The working principle of the moving magnet type reciprocating linear motor is as follows: alternating current is transmitted to the coil winding 10, a certain alternating magnetic field is generated between gaps of the inner stator 3 and the outer stator 1, an axial driving force is generated under the interaction of a constant magnetic field of the permanent magnet and the alternating magnetic field, the formula F is BIL, the strength of the current can determine the magnitude of the thrust, and the mover 2 and the elastic limiting mechanism 11 do reciprocating linear oscillating motion under the action of the driving force, so that the compressor can normally work.
The elastic limiting mechanism 11 is a plate spring which has certain axial stiffness and radial stiffness, and the plate spring is fixed on the upper support 4 and connected with the rotor 3, so that the rotor 3 can reciprocate within a certain stroke, the radial offset phenomenon which may be generated when the rotor 3 does axial linear motion can be avoided, and the abrasion is reduced.
In an alternative embodiment, the coil winding 10 is a single-phase winding, which is wound in the groove of the inner stator 3 from the wire inlet, each layer is wound for 25-30 circles to ensure the resistance value of the motor to be above 0.91 Ω, glue is applied to each layer after the winding is completed to maintain the insulation, and the winding displacement of each layer is uniform and compact.
In an alternative embodiment, the elastic limiting mechanism 11 is a plate spring, and the plate spring has a certain axial stiffness and a certain radial stiffness, so that the mover 3 can reciprocate within a certain stroke, a radial offset phenomenon which may be generated when the mover moves linearly can be avoided, and abrasion is reduced.
The above description is of the preferred embodiment of the utility model. It is to be understood that the utility model is not limited to the particular embodiments described above, in that devices and structures not described in detail are understood to be implemented in a manner common in the art; those skilled in the art can make many possible variations and modifications to the disclosed embodiments, or modify equivalent embodiments to equivalent variations, without departing from the spirit of the utility model, using the methods and techniques disclosed above. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention are still within the scope of the protection of the technical solution of the present invention, unless the contents of the technical solution of the present invention are departed.
Claims (7)
1. A moving magnet type reciprocating linear oscillating motor of a cryogenic refrigerator comprises an outer stator (1), a rotor (2) and an inner stator (3), wherein the rotor (2) is arranged in an annular gap formed after the inner stator (3) and the outer stator (1) are coaxially assembled, and is characterized in that,
the outer stator (1) is axially arranged and fixed between the upper support (4) and the lower support (5), the lower end face of the lower support (5) is tightly attached to the cylinder block and connected with the machine base, and the upper end face of the upper support (4) is provided with an elastic limiting mechanism (11);
the lower end of the inner stator (3) is fixed on the cylinder seat, a circle of groove (31) is formed in the outer diameter of the inner stator (3) along the circumferential direction, a coil winding (10) is arranged in the groove (31), and the outer surface of the coil winding (10) is lower than the outer diameter surface of the inner stator (3);
rotor (2) including rotor support (21) and install magnet steel (8) on rotor support (21), rotor support (21) comprises magnet steel backup pad (6), magnet steel go-between (7) on upper portion and the short packing ring of magnet steel (9) of lower part, magnet steel backup pad (6) fixed mounting is in the up end of magnet steel go-between (7), just magnet steel backup pad (6) pass through connecting piece (12) with elasticity stop gear (11) link to each other, magnet steel (8) are made by the magnet of multi-disc porcelain tile structure, adopt radial magnetization back, N, S level alternate arrangement fixes in the middle of magnet steel go-between (7) on upper portion and the short packing ring of magnet steel (9) of lower part and is in the annular gap.
2. The moving magnet reciprocating linear oscillation motor of claim 1 wherein said magnets are rubidium iron boron magnets.
3. Moving magnet type reciprocating linear oscillation motor as claimed in claim 1, characterized in that the mover support (21) is made of a non-magnetic material.
4. Moving magnet reciprocating linear oscillation motor according to claim 1, characterized in that the outer stator (1) is made of several pieces of silicon steel sheet or SMC material.
5. Moving magnet reciprocating linear oscillation motor according to claim 1, characterized in that the coil winding (10) is a single phase winding with 25-30 turns per layer to ensure a motor resistance above 0.91 Ω.
6. Moving magnet reciprocating linear oscillation motor according to claim 5, characterized in that the outer surface of the coil winding (10) is covered with an insulating glue.
7. Moving magnet reciprocating linear oscillation motor according to claim 1, characterized in that the elastic limit means (11) is a leaf spring.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122251256.8U CN215817863U (en) | 2021-09-16 | 2021-09-16 | Moving magnet type reciprocating linear oscillation motor of cryogenic refrigerator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122251256.8U CN215817863U (en) | 2021-09-16 | 2021-09-16 | Moving magnet type reciprocating linear oscillation motor of cryogenic refrigerator |
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| Publication Number | Publication Date |
|---|---|
| CN215817863U true CN215817863U (en) | 2022-02-11 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122251256.8U Withdrawn - After Issue CN215817863U (en) | 2021-09-16 | 2021-09-16 | Moving magnet type reciprocating linear oscillation motor of cryogenic refrigerator |
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| Country | Link |
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| CN (1) | CN215817863U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113659786A (en) * | 2021-09-16 | 2021-11-16 | 上海超立安科技有限责任公司 | Moving magnet type reciprocating linear oscillation motor of cryogenic refrigerator |
-
2021
- 2021-09-16 CN CN202122251256.8U patent/CN215817863U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113659786A (en) * | 2021-09-16 | 2021-11-16 | 上海超立安科技有限责任公司 | Moving magnet type reciprocating linear oscillation motor of cryogenic refrigerator |
| CN113659786B (en) * | 2021-09-16 | 2024-06-11 | 上海超立安科技有限责任公司 | Moving-magnet type reciprocating linear oscillating motor of low-temperature refrigerator |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20220211 Effective date of abandoning: 20240611 |
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| AV01 | Patent right actively abandoned |
Granted publication date: 20220211 Effective date of abandoning: 20240611 |