Moving magnet linear oscillation motor and linear compressor

Abstract

The present invention relates to a moving magnet type linear oscillation motor and a linear compressor, comprising: an upper frame, a lower frame, an outer stator fixing part arranged between the upper frame and the lower frame, an outer stator group fixed on the outer stator fixing part, an inner stator arranged in the inner cavity of the outer stator group, and a mover arranged between the outer stator group and the inner stator. The outer stator group comprises two sets of outer stators arranged axially; the outer stator comprises an outer stator core and a winding embedded in a coil slot of the outer stator core; the outer stator core, the inner stator and the mover are all coaxially arranged; and the outer stator core is assembled from a plurality of small stator cores arranged in a circular array; the small stator core is a spiral C-shaped structure. The present invention overcomes the defects of the traditional double-stator transverse flux linear oscillation motor, such as the long spacing between the two outer stator cores and the waste of permanent magnet materials, reduces the axial length of the permanent magnet and the mover, makes the motor structure more compact, and has a high utilization rate of the permanent magnet.

Description

Technical Field

[0001] The present invention relates to the technical field of special motors, in particular to the technical field of compressors, and specifically to a moving magnet linear oscillation motor and a linear compressor. Background Art

[0002] Currently, most compressors used in refrigerators, air conditioners, and other refrigeration equipment are still rotary compressors. These compressors are driven by traditional rotary motors, using a crank-connecting rod mechanism to convert rotary motion into reciprocating piston motion. Due to structural limitations, these compressors suffer from high friction and low efficiency, making further performance improvements difficult. Linear compressors, on the other hand, use a linear motor to directly drive the piston for reciprocation, eliminating the crank-connecting rod mechanism, reducing friction losses, and improving system efficiency. They are expected to become a promising alternative to existing rotary refrigeration compressors.

[0003] South Korea's LG company disclosed a linear compressor in its Chinese patent application number CN200880112785.4. The longitudinal cross-sectional view of the compressor structure is shown in FIG. Figure 8 As shown, the linear oscillation motor used is primarily composed of the following structures: stator winding, outer stator core, inner stator core, permanent magnets, permanent magnet bracket, piston, and resonant spring. The motor rotor consists of permanent magnets and a non-magnetic permanent magnet bracket. The stator winding is a pancake-shaped winding embedded in the outer stator core with a "C"-shaped structure. Because the motor's main magnetic circuit is parallel to the direction of motion of the rotor, the inner stator core must have a radial structure with a tight inner core and loose outer core. This motor has a compact structure, reduces friction losses, and achieves high mechanical efficiency. However, the radial structure of the inner stator silicon steel stampings is difficult to stack and process, increasing processing costs. In addition, because the silicon steel stampings that make up the inner stator have uniform thickness, gaps inevitably exist between the silicon steel stampings on the outer circumference of the inner stator, increasing magnetic resistance and reducing motor efficiency.

[0004] Chinese patent application Nos. 200610052853.5 and 201020199357.4 disclose two moving magnet transverse flux linear oscillating motors, both of which have a double stator structure. Figure 9 and Figure 10As shown, the structure of each outer stator core is similar to that of a salient-pole stator core in a brushless DC motor. The stator winding is a centralized winding embedded in the outer stator core's slots. The motor's rotor primarily consists of permanent magnets, a permanent magnet bracket, and a piston. Compared to LG's linear compressor technology, the linear oscillating motors in these two patents utilize a transverse flux motor structure, meaning the main magnetic circuit is perpendicular to the direction of motion of the rotor. Therefore, both the inner and outer stator cores are constructed from uniformly thick silicon steel stampings stacked axially, rather than a radial structure with a tight inner core and loose outer cores. This allows the motor to be processed and assembled using the same process as conventional rotating motors, offering advantages such as easy installation, a simple structure, and low magnetic resistance. However, this also has drawbacks. Because the stator winding coils protrude from both ends of the outer stator cores, a gap is required between the two outer stator cores to accommodate the exposed portion of the winding. To match the dimensions of the outer stator, a corresponding gap of equal length is also reserved for the permanent magnets on the rotor. Electromagnetic analysis shows that this section of permanent magnets does not participate in the generation of electromagnetic force and is a redundant structure. Therefore, this structure has the following disadvantages: it causes waste of materials such as permanent magnets and inner stators, and the utilization rate of permanent magnet materials is low; it increases the mass of the mover. According to the principle of mechanical vibration, the stiffness of the compressor resonant spring will also increase accordingly, increasing manufacturing costs; the distance between the outer stators is large, making it difficult to reduce the length and volume of the body; it will cause large leakage magnetic field at the gap between the permanent magnets, affecting the distribution of magnetic lines of force. Summary of the Invention

[0005] The first object of the present invention is to provide a moving magnet linear oscillation motor to solve the technical problem of avoiding the defects caused by the large spacing distance between the outer stators.

[0006] A second object of the present invention is to provide a linear compressor to solve the technical problem of avoiding the defects caused by the large distance between the inner and outer stators of the compressor motor.

[0007] The moving magnet linear oscillation motor of the present invention is realized as follows:

[0008] A moving magnet linear oscillation motor, characterized by comprising:

[0009] An upper frame, a lower frame, an outer stator fixing member disposed between the upper frame and the lower frame, an outer stator group fixed to the outer stator fixing member, an inner stator disposed in an inner cavity of the outer stator group, and a mover disposed between the outer stator group and the inner stator; wherein

[0010] The outer stator group includes two sets of outer stators arranged axially; the outer stator includes an outer stator core and windings embedded in coil slots of the outer stator core;

[0011] The outer stator core, the inner stator and the mover are all coaxially arranged; and

[0012] The outer stator core is assembled from a number of small stator cores arranged in a circular array; the small stator cores are of a spiral C-shaped structure, the two ends of the spiral C-shaped small stator cores are parallel and staggered at a certain distance from each other, and the end faces of the two opposite parts of the small stator cores constituting the two sets of the outer stators are flush and coplanar.

[0013] Furthermore, the small stator core is formed by connecting an upper stator and a lower stator to form a spiral C-shaped structure, and the spiral C-shaped structure has coil slots suitable for embedding windings therein;

[0014] The upper stator and the lower stator each include a base and wings connected to the base;

[0015] The base of the upper stator and the base of the lower stator are in contact with each other; and

[0016] The wing portion of the upper stator and the wing portion of the lower stator respectively constitute the two end portions of the spiral C-shaped small stator core.

[0017] Further optionally, the spiral C-shaped small stator cores constituting the two sets of the outer stators have the same spiral direction, and the windings in the coil slots of the spiral C-shaped small stator cores have opposite winding directions; and

[0018] The windings in the coil slots of the two sets of spiral C-shaped small stator cores of the outer stators are connected in series or in parallel.

[0019] Further optionally, the spiral directions of the spiral C-shaped small stator cores constituting the two sets of the outer stators are opposite, and the winding directions of the windings in the coil slots of the spiral C-shaped small stator cores are the same; and

[0020] The windings in the coil slots of the two sets of spiral C-shaped small stator cores of the outer stators are connected in series or in parallel.

[0021] Furthermore, the winding is a pancake-type winding.

[0022] Furthermore, the mover at least includes a permanent magnet ring and a permanent magnet bracket for mounting the permanent magnet ring;

[0023] The permanent magnet bracket is located between the outer stator core and the inner stator, and is coaxially arranged with the outer stator core and the inner stator;

[0024] The permanent magnet ring is composed of a plurality of tile-shaped magnetic tiles; the magnetic tiles are magnetized in a radial direction, and the magnetization directions of two adjacent magnetic tiles are opposite; and

[0025] The number of magnetic tiles is the same as the number of magnetic poles of the outer stator core, and their positions are aligned one by one.

[0026] Furthermore, the inner stator is formed by stacking stator punchings with uniform thickness arranged along the axial direction of the motor.

[0027] The linear compressor of the present invention is achieved as follows:

[0028] A linear compressor comprises the above-mentioned dynamic magnet linear oscillation motor, a gas compression mechanism installed in the middle of the dynamic magnet linear oscillation motor, and a resonant spring assembly installed at the lower end of the dynamic magnet linear oscillation motor; wherein

[0029] The moving magnet linear oscillation motor includes an upper frame, a lower frame, an outer stator fixing member disposed between the upper frame and the lower frame, an outer stator group fixed to the outer stator fixing member, an inner stator disposed in an inner cavity of the outer stator group, and a mover disposed between the outer stator group and the inner stator; and

[0030] The gas compression mechanism is connected and assembled on the upper frame, and the gas compression mechanism is coaxially arranged with the outer stator core and the inner stator;

[0031] The resonant spring assembly is connected and assembled on the lower frame.

[0032] Furthermore, the gas compression mechanism includes a cylinder fixedly connected to the upper frame, a piston arranged in the cylinder, and an end cover for sealing the upper end of the cylinder; wherein

[0033] The cylinder is equipped with a valve group, which includes an intake valve and an exhaust valve;

[0034] The outer ring of the upper end of the piston is provided with a plurality of piston ring grooves, and piston rings are arranged in the piston ring grooves; a plurality of annular sealing teeth are arranged between every two piston ring grooves.

[0035] Furthermore, the resonant spring assembly is composed of a plurality of resonant springs;

[0036] The resonant spring assembly is fixedly connected to the mover of the moving magnet linear oscillation motor, and the resonant spring assembly and the mover form a resonant system, that is,

[0037] When the electromagnetic excitation frequency of the moving magnet linear oscillation motor is consistent with the natural frequency of the resonant system, a smaller electromagnetic excitation can excite the moving subsystem to perform a larger amplitude resonant motion.

[0038] The beneficial effects of the present invention are as follows: compared with traditional rotary compressors, the dynamic magnet linear oscillation motor and linear compressor of the present invention eliminate the need for a crank-connecting rod transmission mechanism, thereby reducing friction loss and achieving high mechanical efficiency.

[0039] By using stacked small stator cores to form an outer stator core, the defects of the traditional double-stator transverse flux linear oscillation motor, such as the long spacing between the two outer stator cores and the waste of permanent magnet material, are overcome, the axial length of the permanent magnet and the mover is reduced, the motor structure is more compact, the utilization rate of the permanent magnet is high, the use of permanent magnets is saved, the mass of the mover is reduced, and the resonant spring stiffness and the size and weight of the entire machine are reduced.

[0040] Furthermore, the inner stator is made of stator punchings of uniform thickness arranged and stacked along the axial direction of the motor, which solves the difficulty of the inner stator having a radial structure and being difficult to stack. The manufacturing and processing are convenient and the magnetic resistance of the motor is small. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] The present invention will be further described below with reference to the accompanying drawings and examples.

[0042] Figure 1 1 is a longitudinal sectional structural diagram of a moving magnet linear oscillation motor according to embodiment 1 of the present invention;

[0043] Figure 2 is a transverse cross-sectional top view of the moving magnet linear oscillation motor according to Example 1 of the present invention;

[0044] Figure 3 1 is a schematic structural diagram of a small stator core according to embodiment 1 of the present invention;

[0045] Figure 4 2 is a longitudinal cross-sectional structural diagram of a moving magnet linear oscillation motor in Example 2 of the present invention;

[0046] Figure 5 is a transverse cross-sectional structural diagram of a moving magnet linear oscillation motor in Example 2 of the present invention;

[0047] Figure 6 is a longitudinal sectional structural diagram of a linear compressor according to embodiment 4 of the present invention;

[0048] Figure 7 2 is a schematic structural diagram of a three-arm vortex linear leaf spring according to embodiment 4 of the present invention;

[0049] Figure 8 A longitudinal cross-sectional view of the linear compressor disclosed in the document with application number CN200880112785.4;

[0050] FIG9 is a schematic longitudinal cross-sectional view of the moving magnet transverse flux linear oscillation motor in the application document with the application number 201020199357.4.

[0051] FIG10 is a transverse cross-sectional view of the moving magnet transverse flux linear oscillation motor in the application document with the application number 201020199357.4.

[0052] In the figure: upper frame 100, circular hole 110, upper screw hole 120, lower frame 200, lower screw hole 210, outer stator fixing part 300, outer stator core 400, small stator core 410, upper stator 411, lower stator 412, distance h, base 4111, wing 4112, winding 420, inner stator 500, permanent magnet bracket 600, mover core 610, permanent magnet ring 620, frame bolt 700, cylinder 800, intake valve 810, exhaust valve 820, piston 900, piston ring 910, end cover 920, resonant spring 1000, bolt hole 1010. DETAILED DESCRIPTION

[0053] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort are also within the scope of protection of the present invention.

[0054] [a1] Example 1:

[0055] like Figure 1 and Figure 2 As shown, the present invention provides a moving magnet linear oscillation motor suitable for a linear compressor, comprising: an upper frame 100, a lower frame 200, an outer stator fixing member 300 arranged between the upper frame 100 and the lower frame 200, an outer stator group fixed on the outer stator fixing member 300, an inner stator 500 arranged in an inner cavity of the outer stator group, and a mover arranged between the outer stator group and the inner stator 500.

[0056] The outer stator fixture 300 has an axially defined inner wall for securing the outer stator core 400. The outer stator fixture 300 may be, for example, but not limited to, cylindrical. Based on the shape and assembly position of the outer stator core 400, corresponding slots are cut into the cylindrical wall of the outer stator fixture 300, and the outer stator core 400 is secured within the slots. The outer stator fixture 300 is then positioned between the upper frame 100 and the lower frame 200. The upper and lower frames 100 and 200 are connected via fasteners (e.g., bolts) to clamp and secure the outer stator fixture 300.

[0057] In this embodiment, upper screw holes 120 are defined on the edge of the upper frame 100, and lower screw holes 210 are defined on the edge of the lower frame 200 at positions corresponding to the upper screw holes 120. The upper frame 100 and lower frame 200 are secured together using frame bolts 700 that pass through the upper screw holes 120 and lower screw holes 210. This securement of the upper frame 100 and lower frame 200 secures the outer stator assembly, mover, and inner stator 500 between the upper frame 100 and lower frame 200.

[0058] The outer stator assembly includes two sets of outer stators arranged axially; the outer stator includes an outer stator core 400 and a winding 420 embedded in the coil slot of the outer stator core 400; the outer stator core 400, the inner stator 500 and the mover are all coaxially arranged.

[0059] The outer stator core 400 is assembled from a number of small stator cores 410 arranged in a circular array. The small stator core 410 is made of soft magnetic material, for example, it can be cut and stacked from silicon steel sheets, or it can be made of amorphous material iron silicon aluminum. The small stator core 410 is a spiral C-shaped structure, and the two ends of the spiral C-shaped small stator core 410 are parallel and staggered from each other by a certain distance h, and the end faces of the two end portions of the relative parts of the small stator cores 410 constituting the two sets of outer stators are flush and coplanar. Through the above-mentioned structure designed, the direction of the magnetic flux in the traditional C-shaped core can be converted from being parallel to the direction of movement of the mover to a transverse magnetic flux direction, that is, the magnetic flux direction is perpendicular to the direction of movement of the mover. In this way, the advantages of the traditional dual-stator transverse flux linear oscillation motor can be retained.

[0060] For details, please refer to Figure 3 As shown, the small stator core 410 is formed by joining an upper stator 411 and a lower stator 412 together to form a spiral C-shaped structure. The spiral C-shaped structure has coil slots suitable for inserting windings 420. The upper stator 411 and the lower stator 412 each include a base 4111 and a wing 4112 connected to the base 4111. The base 4111 of the upper stator 411 and the base 4111 of the lower stator 412 are in close contact with each other. The wings 4112 of the upper stator 411 and the wings 4112 of the lower stator 412 respectively form the two ends of the spiral C-shaped small stator core 410. Optionally, to improve the stability of the splicing of the upper stator 411 and the lower stator 412, a concave and convex structure suitable for mutual insertion is provided between the upper stator 411 and the lower stator 412.

[0061] In this embodiment, the spiral C-shaped small stator cores 410 constituting the two sets of outer stators have the same spiral direction, and the windings 420 in the coil slots of the spiral C-shaped small stator cores 410 are wound in opposite directions; and the windings 420 in the coil slots of the spiral C-shaped small stator cores 410 of the two sets of outer stators are connected in series or in parallel.

[0062] The winding 420 in this embodiment is a pancake-type winding 420, which is embedded in the coil slots of the spiral C-shaped small stator core 410, and does not expose the two ends of the small stator core 410. Therefore, the problem of excessive distance between the two small stator cores caused by the exposure of the coil of the traditional centralized winding 420 is avoided. The spacing between the two small stator cores 410 can be set very small, and at the same time, the use of permanent magnets is correspondingly reduced.

[0063] The mover includes at least a permanent magnet ring 620 and a permanent magnet bracket 600 for mounting the permanent magnet ring 620. To ensure coordination between the mover and the inner and outer stators, the permanent magnet bracket 600 is located between the outer stator core 400 and the inner stator 500 and is coaxially arranged with the outer stator core 400 and the inner stator 500. The permanent magnet ring 620 is composed of multiple tile-shaped magnetic tiles. The tiles are magnetized radially, with adjacent tiles magnetized in opposite directions. The number of tiles matches the number of magnetic poles in the outer stator core 400, and their positions are aligned one-to-one. The permanent magnet bracket 600 of this embodiment is a cup-shaped structure made of non-magnetic material. It serves to secure the permanent magnet ring 620 and other components and is suitable for connecting components such as the resonant spring 1000 and the piston 900. The tiles of this embodiment are made of, for example, but not limited to, sintered neodymium iron boron.

[0064] The mover of this embodiment also includes a mover core 610. The mover core 610 is a cylindrical structure and is arranged on the outer surface of the permanent magnet bracket 600. The material of the mover core 610 is a soft magnetic material. The permanent magnet ring 620 is adhered to the outer surface of the mover core 610. The mover core 610 can be made of annular silicon steel punchings stacked axially, or can be made of amorphous material sendust. The mover core 610 in this embodiment is adhered to the outer surface of the permanent magnet bracket 600 using, for example, but not limited to, high-strength glue. The permanent magnet ring 620 is adhered to the outer surface of the mover core 610 using, for example, but not limited to, high-strength glue.

[0065] The inner stator 500 is made of stator punchings of uniform thickness arranged and stacked along the axial direction of the motor, which greatly reduces the difficulty and cost of processing and reduces magnetic resistance. The stator punchings are made of, for example, but not limited to, annular silicon steel punchings.

[0066] Example 2:

[0067] See also Figure 4 and Figure 5 As shown, the structure of this embodiment is roughly the same as that of embodiment 1, except that: in this embodiment, there is no moving core 610, and the magnetic tiles that form the permanent magnet ring 620 are directly embedded or attached on the outer wall surface of the permanent magnet bracket 600. The magnetization direction and arrangement of the magnetic tiles are the same as those in embodiment 1. The longitudinal cross-sectional structure diagram and transverse cross-sectional top view of the dynamic magnet linear oscillation motor of embodiment 2 are shown in FIG. Figure 4 and Figure 5 shown.

[0068] Example 3:

[0069] The structure of this embodiment is substantially the same as that of Embodiment 1 or Embodiment 2, except that: in this embodiment, the spiral directions of the spiral C-shaped small stator cores 410 constituting the two sets of outer stators are opposite, and the winding directions of the windings 420 in the coil slots of the spiral C-shaped small stator cores 410 are the same; and the windings 420 in the coil slots of the spiral C-shaped small stator cores 410 of the two sets of outer stators are connected in series or in parallel.

[0070] Example 4:

[0071] like Figure 6 and Figure 7 As shown, based on Example 1 or Example 2 or Example 3, this embodiment provides a linear compressor, which adopts the dynamic magnet linear oscillation motor of Example 1 or Example 2, a gas compression mechanism installed in the middle of the dynamic magnet linear oscillation motor, and a resonant spring assembly installed at the lower end of the dynamic magnet linear oscillation motor.

[0072] The moving magnet linear oscillation motor includes an upper frame 100, a lower frame 200, an outer stator fixing member 300 arranged between the upper frame 100 and the lower frame 200, an outer stator group fixed on the outer stator fixing member 300, an inner stator 500 arranged in the inner cavity of the outer stator group, and a mover arranged between the outer stator group and the inner stator 500.

[0073] The gas compression mechanism is connected and assembled on the upper frame 100 , and the gas compression mechanism is coaxially arranged with the outer stator core 400 and the inner stator 500 ; the resonant spring assembly is connected and assembled on the lower frame 200 .

[0074] The gas compression mechanism includes a cylinder 800 fixedly connected to the upper frame 100, a piston 900 disposed within the cylinder 800, and an end cap 920 for sealing the upper end of the cylinder 800. The cylinder 800 is equipped with a valve assembly comprising an inlet valve 810 and an exhaust valve 820. The valve assembly can be located at the upper end of the cylinder 800 or, depending on the situation, elsewhere on the cylinder 800 or piston 900. For example, the inlet valve 810 can be located on the end face of the piston 900. The permanent magnet bracket 600 is connected to one end of the piston 900 and secured with screws. This allows the piston 900 to reciprocate along its axis within the cylinder 800 when the movable component moves, compressing the gas. The cylinder 800 also functions as a linear sliding bearing.

[0075] To ensure airtightness between cylinder 800 and piston 900, piston ring seals and labyrinth seals are used. The outer ring of the upper end of piston 900 is provided with several piston ring grooves, each containing piston rings 910. Multiple annular sealing teeth are located between each piston ring groove.

[0076] In order to minimize the friction loss between the cylinder 800 and the piston 900, the system adopts a self-lubricating design, and the material of the piston ring 910 is the self-lubricating material polytetrafluoroethylene.

[0077] Specifically, a circular hole 110 for installing the cylinder 800 is opened at the center position of the upper frame 100. The cylinder 800 is fixed to the upper frame 100 by bolts and remains coaxial with the outer stator group and the inner stator 500, so that the inner stator 500 fits on the outer surface of the cylinder 800.

[0078] The resonant spring assembly is composed of a plurality of resonant springs 1000. The resonant spring assembly is fixedly coupled to the rotor of the moving magnet linear oscillating motor, forming a resonant system with the resonant spring assembly and the rotor. Specifically, when the electromagnetic excitation frequency of the moving magnet linear oscillating motor is consistent with the natural frequency of the resonant system, a relatively small electromagnetic excitation can excite the rotor system to perform a resonant motion with a relatively large amplitude. Optionally, the resonant spring assembly can be fixedly coupled to the permanent magnet bracket 600 and the lower frame 200 via bolts, respectively. After the resonant spring 1000 is coupled to the rotor and stator, the rotor and stator will not undergo significant rotation relative to the axis of symmetry. Specifically, two bolt holes 1010 are provided near the center of the resonant spring 1000 for bolting to the permanent magnet bracket 600, and multiple bolt holes 1010 are provided near the outer periphery for bolting to the lower frame 200.

[0079] Optionally, the resonant spring 1000 is a three-arm vortex linear leaf spring; the material of the resonant spring 1000 is an alloy spring steel plate, which is cut along the curve of the vortex linear shape to divide the plate surface into three spring arms.

[0080] During operation, alternating current of a certain frequency is passed through the winding 420 of the outer stator core 400 of the motor, and an alternating electromagnetic field is generated in the air gap between the inner stator 500 and the outer stator core 400 of the motor. The permanent magnet ring 620 generates an alternating electromagnetic thrust under the action of the electromagnetic field. When the electromagnetic excitation frequency of the motor is consistent with the natural frequency of the resonant system, the resonant system resonates, thereby pushing the piston 900 to perform a linear reciprocating motion along the symmetry axis of the motor to compress the gas.

[0081] The moving magnet linear oscillation motor of the present invention has the advantages of easy processing, compact structure, high mechanical efficiency, high utilization rate of permanent magnets, and smooth output force. It is suitable for refrigeration fields such as refrigerator refrigeration compressors and gas compression fields, and is particularly suitable for gas compressors requiring oil-free lubrication.

[0082] With the above-described preferred embodiments of the present invention as a guide, and with reference to the above description, relevant personnel are fully capable of making various changes and modifications without departing from the technical scope of this invention. The technical scope of this invention is not limited to the contents of the specification and must be determined according to the scope of the claims.

[0083] In the description of the present invention, it should be understood that the terms indicating orientation or positional relationships are based on the orientation or positional relationships shown in the accompanying drawings and are only used to facilitate the description of the present invention and simplify the description. They do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, they cannot be understood as limiting the present invention.

[0084] In the present invention, unless otherwise expressly specified or limited, terms such as "mounted," "connected," "connect," and "fixed" should be understood broadly. For example, they may refer to fixed or detachable connections, or integration; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0085] In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer" and the like indicate positions or locations based on the positions shown in the accompanying drawings, or the positions or locations in which the inventive product is typically placed when in use. These terms are intended solely to facilitate the description of the present invention and to simplify the description, and are not intended to indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," and "third," etc., are used solely to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0086] Furthermore, terms such as "horizontal," "vertical," and "overhanging" do not necessarily imply that a component must be absolutely horizontal or overhanging, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but rather that it can be slightly tilted.

[0087] In the present invention, unless otherwise expressly specified or limited, a first feature being above or below a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Furthermore, a first feature being above, above, and above the second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being below, below, and below the second feature includes the first feature being directly below and obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0088] There is no duplication between these two paragraphs. The upper paragraph is a discussion of the embodiments in this specification, and the lower paragraph is a description of the drawings corresponding to the embodiments in this specification. That is, neither the specific embodiments of the present invention nor the drawings in the specification are intended to be absolute limitations.

Claims

1. A moving magnet linear oscillation motor, characterized in that: include: An upper frame, a lower frame, an outer stator fixing member disposed between the upper frame and the lower frame, an outer stator group fixed to the outer stator fixing member, an inner stator disposed in the inner cavity of the outer stator group, and a mover disposed between the outer stator group and the inner stator; wherein The outer stator group includes two sets of outer stators arranged axially; the outer stator includes an outer stator core and a winding embedded in a coil slot of the outer stator core; The outer stator core, the inner stator and the mover are all coaxially arranged; and The outer stator core is assembled from a plurality of small stator cores arranged in a circumferential array; the small stator core is a spiral C-shaped structure, the two ends of the spiral C-shaped small stator core are parallel and staggered at a certain distance from each other, and the end faces of the two opposite ends of the small stator cores constituting the two sets of the outer stators are flush and coplanar; The small stator core is formed by connecting an upper stator and a lower stator to form a spiral C-shaped structure, and the spiral C-shaped structure has a coil slot suitable for embedding the winding therein; The upper stator and the lower stator each include a base and a wing connected to the base; The base of the upper stator and the base of the lower stator are in close contact with each other; and The wing portion of the upper stator and the wing portion of the lower stator respectively constitute the two ends of the spiral C-shaped small stator core; The spiral directions of the spiral C-shaped small stator cores constituting the two sets of the outer stators are the same, and the winding directions of the windings in the coil slots of the spiral C-shaped small stator cores are opposite; and The windings in the coil slots of the two sets of spiral C-shaped small stator cores of the outer stators are connected in series or in parallel; The winding is a pancake winding; The inner stator is formed by stacking stator punching sheets with uniform thickness arranged along the axial direction of the motor.

2. The moving magnet linear oscillation motor according to claim 1, characterized in that: The spiral directions of the spiral C-shaped small stator cores constituting the two sets of the outer stators are opposite, and the winding directions of the windings in the coil slots of the spiral C-shaped small stator cores are the same; and The windings in the coil slots of the two sets of spiral C-shaped small stator cores of the outer stator are connected in series or in parallel.

3. The moving magnet linear oscillation motor according to claim 1, characterized in that: The mover at least comprises a permanent magnet ring and a permanent magnet bracket for mounting the permanent magnet ring; The permanent magnet bracket is located between the outer stator core and the inner stator, and is coaxially arranged with the outer stator core and the inner stator; The permanent magnet ring is composed of a plurality of tile-shaped magnetic tiles spliced ​​together; the magnetic tiles are magnetized in a radial direction, and the magnetization directions of two adjacent magnetic tiles are opposite; and The number of magnetic tiles is the same as the number of magnetic poles of the outer stator core, and their positions are aligned one by one.

4. A linear compressor, characterized in that: It comprises a moving magnet linear oscillation motor as claimed in any one of claims 1 to 3, a gas compression mechanism installed in the middle of the moving magnet linear oscillation motor, and a resonant spring assembly installed at the lower end of the moving magnet linear oscillation motor; wherein The moving magnet linear oscillation motor comprises an upper frame, a lower frame, an outer stator fixing member disposed between the upper frame and the lower frame, an outer stator group fixed to the outer stator fixing member, an inner stator disposed in an inner cavity of the outer stator group, and a mover disposed between the outer stator group and the inner stator; and The gas compression mechanism is connected and assembled on the upper frame, and the gas compression mechanism is coaxially arranged with the outer stator core and the inner stator; The resonant spring assembly is connected and assembled on the lower frame.

5. The linear compressor according to claim 4, characterized in that: The gas compression mechanism comprises a cylinder fixedly connected to the upper frame, a piston arranged in the cylinder, and an end cover for sealing the upper end of the cylinder; in The cylinder is equipped with a valve group, which includes an intake valve and an exhaust valve; The outer ring of the upper end of the piston is provided with a plurality of piston ring grooves, and piston rings are arranged in the piston ring grooves; and a plurality of annular sealing teeth are arranged between every two piston ring grooves.

6. The linear compressor according to claim 4, characterized in that: The resonant spring assembly is composed of a plurality of resonant springs; The resonant spring assembly is fixedly connected to the mover of the moving magnet linear oscillation motor, and the resonant spring assembly and the mover form a resonant system, that is, When the electromagnetic excitation frequency of the moving magnet linear oscillation motor is consistent with the natural frequency of the resonant system, a smaller electromagnetic excitation can excite the moving subsystem to perform a larger amplitude resonant motion.

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