Linear motor and linear compressor

Abstract

The invention relates to the technical field of linear motors, and provides a linear motor and a linear compressor, the linear motor comprises a stator component and a rotor component, the stator component comprises an inner stator, an outer stator and coils, one of the inner stator and the outer stator comprises at least two groups of stator blocks, and each stator block is provided with a coil; the rotor component comprises a connecting support and permanent magnets, each set of stator blocks corresponds to one set of permanent magnets, each set of permanent magnets are distributed in the circumferential direction of the cylindrical structure, each set of permanent magnets comprises at least two permanent magnets, and the permanent magnets in each set are distributed in the axial direction of the cylindrical structure. The magnetizing direction of the permanent magnets is parallel to the distribution direction of the cylindrical structure and the stator blocks corresponding to the permanent magnets, the south pole of one of the two adjacent permanent magnets faces the inner stator, and the south pole of the other permanent magnet faces the outer stator. Therefore, the magnetic poles of the adjacent positions of any two adjacent permanent magnets are opposite and attract each other, the magnetic field intensity of the permanent magnets is enhanced, the installation and positioning are improved, the assembly difficulty is reduced, and the positioning precision is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of linear motors, and particularly to a linear motor and a linear compressor. Background Art

[0002] A linear compressor is a device that directly compresses gas by means of the linear reciprocating motion of a piston. Compared with traditional rotary compressors, it has higher efficiency and less mechanical loss. Traditional linear compressors rely on a crank connecting rod mechanism to convert rotary motion into linear motion, and there are problems such as high mechanical loss and complex lubrication systems. Therefore, in some related technologies, a linear motor is selected as a driving member to directly drive the piston to perform linear reciprocating motion, eliminating the intermediate transmission mechanism, which can significantly improve the efficiency of the compressor and has the advantages of a compact structure, no oil or less lubricating oil. Such compressors have become the mainstream choice for small refrigeration equipment such as medical low-temperature refrigerators and vehicle-mounted air conditioners.

[0003] There are layout defects in the linear compressors in related technologies. The magnetic field at the joint of the assembled permanent magnets is weakened, the magnetic energy utilization rate is low, and the assembly is difficult. The repulsive force between the permanent magnets is not conducive to the installation and positioning of each permanent magnet, and the positioning accuracy is poor.

[0004] Therefore, how to solve the problems of the weakened magnetic field at the joint of the assembled permanent magnets, difficult assembly, and poor installation and positioning accuracy in the linear motors in related technologies has become an important technical problem to be solved by those skilled in the art. Summary of the Invention

[0005] The present invention provides a linear motor and a linear compressor to solve the defects of the weakened magnetic field at the joint of the assembled permanent magnets, difficult assembly, and poor installation and positioning accuracy in the linear motors in related technologies, reduce the assembly difficulty, and improve the installation and positioning accuracy.

[0006] The present invention provides a linear motor, including: A stator component, including an inner stator, an outer stator, and coils. One of the inner stator and the outer stator has a hollow cylindrical structure, and the other includes at least two groups of stator blocks. Each group of stator blocks is circumferentially spaced apart along the cylindrical structure, and each stator block is provided with a coil; The mover component includes a connecting bracket and at least two groups of permanent magnets. Each group of the permanent magnets is fixedly arranged on the connecting bracket. The permanent magnets are arranged between the stator block and the cylindrical structure. Each group of the permanent magnets is circumferentially distributed along the cylindrical structure. Each group of the stator blocks corresponds to a group of the permanent magnets. Each group of the permanent magnets includes at least two of the permanent magnets. Each of the permanent magnets in each group is axially distributed along the cylindrical structure. The magnetization direction of the permanent magnets is parallel to the distribution direction of the cylindrical structure and the stator block corresponding to the permanent magnets. Among any two adjacent permanent magnets, the south pole of one faces the inner stator, and the south pole of the other faces the outer stator.

[0007] According to a linear motor provided by the present invention, the stator block is provided with a wire threading space. The wire threading space penetrates the stator block along the circumferential direction of the cylindrical structure. A notch is provided on one side of the stator block close to the mover component. The notch communicates with the wire threading space. The coil is adapted to be sleeved on any side wall of the wire threading space.

[0008] According to a linear motor provided by the present invention, each stator block is provided with two of the wire threading spaces. The two wire threading spaces are spaced apart along the axial direction of the cylindrical structure. A columnar structure is formed between the two wire threading spaces; Each of the wire threading spaces corresponds to a coil. The coil is adapted to be sleeved on the side wall of the wire threading space away from the columnar structure; or, the two wire threading spaces correspond to a coil. The coil is adapted to be sleeved on the columnar structure.

[0009] According to a linear motor provided by the present invention, along the axial direction of the cylindrical structure, each stator block corresponds to two of the permanent magnets; Or, along the axial direction of the cylindrical structure, each stator block corresponds to four of the permanent magnets.

[0010] According to a linear motor provided by the present invention, each stator block is provided with one of the wire threading spaces. Along the axial direction of the cylindrical structure, each stator block corresponds to three of the permanent magnets; Each of the wire threading spaces corresponds to a coil, or each of the wire threading spaces corresponds to two coils.

[0011] According to a linear motor provided by the present invention, each group of the stator blocks includes at least two of the stator blocks. Each of the stator blocks in each group is axially distributed along the cylindrical structure.

[0012] According to a linear motor provided by the present invention, the coils are connected in series. Among each group of the stator blocks, the winding directions of the coils on any two adjacent groups of the stator blocks are opposite; When two coils are provided on each stator block, the winding directions of the two coils on each stator block are opposite.

[0013] According to a linear motor provided by the present invention, for each stator block in each group, the winding quantity and winding direction of the coils of any two adjacent stator blocks are the same.

[0014] According to a linear motor provided by the present invention, the stator block is integrally formed of a soft magnetic material, or the stator block includes a plurality of magnetic conduction sheets, and the plurality of magnetic conduction sheets are stacked together; And / or, the connecting bracket is made of a non-magnetic conductive material.

[0015] The present invention also provides a linear compressor, including the above-mentioned linear motor.

[0016] The linear motor provided by the present invention includes a stator component and a rotor component. The stator component includes an inner stator, an outer stator and coils. One of the inner stator and the outer stator has a hollow cylindrical structure, and the other includes at least two groups of stator blocks. Each group of stator blocks is circumferentially spaced around the cylindrical structure, and each stator block is provided with a coil. That is to say, around the cylindrical structure, a plurality of coils are circumferentially distributed along the cylindrical structure. The rotor component includes a connecting bracket and at least two groups of permanent magnets, and each group of permanent magnets is fixedly arranged on the connecting bracket. The permanent magnets are arranged between the stator blocks and the cylindrical structure, and each group of permanent magnets is circumferentially distributed along the cylindrical structure. Each group of stator blocks corresponds to a group of permanent magnets. Each group of permanent magnets includes at least two permanent magnets, and each of the permanent magnets in each group is distributed along the axial direction of the cylindrical structure. The magnetization direction of the permanent magnets is parallel to the distribution direction of the cylindrical structure and the stator blocks corresponding to the permanent magnets. The south pole of one of any two adjacent permanent magnets faces the inner stator, and the south pole of the other faces the outer stator. By passing alternating current in corresponding directions through each coil, an attractive force or a repulsive force can be generated between each coil and the corresponding permanent magnet, ensuring that the directions of the forces on each permanent magnet are the same, so that each permanent magnet can drive the connecting bracket to move relative to the stator components such as the coils along the direction of the above-mentioned force. With such a setting, the magnetic poles at the positions where any two adjacent permanent magnets are close to each other are opposite, attracting each other, and the magnetic field intensity at the positions where any two adjacent permanent magnets are close to each other is enhanced, which can improve the utilization rate of magnetic energy, improve the installation and positioning, reduce the assembly difficulty, improve the positioning accuracy, and solve the problems of the weakening of the magnetic field at the joints of the permanent magnet assemblies, difficult assembly and poor installation and positioning accuracy existing in the linear motors in the related art.

[0017] Furthermore, in the linear compressor provided by the present invention, due to having the above-mentioned linear motor, it also has the above-mentioned various advantages. Description of the Drawings

[0018] To more clearly illustrate the technical solutions in the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0019] Figure 1 It is a schematic structural diagram of a linear motor provided by the present invention.

[0020] Figure 2 It is a cross-sectional view of the linear motor provided by the present invention at the axial section position.

[0021] Figure 3 It is a schematic structural diagram of a stator block provided by the present invention.

[0022] Figure 4 It is a schematic diagram of the relative positions of the stator component and the mover component in the axial section position of the linear motor provided by the present invention Figure 1 (The closed curve in the figure is the magnetic force path generated by the coil).

[0023] Figure 5 It is a schematic diagram of the relative positions of the stator component and the mover component in the axial section position of the linear motor provided by the present invention Figure 2 (The closed curve in the figure is the magnetic force path generated by the coil).

[0024] Figure 6 It is a schematic diagram of the relative positions of the stator component and the mover component in the axial section position of the linear motor provided by the present invention Figure 3 (The closed curve in the figure is the magnetic force path generated by the coil).

[0025] Figure 7 It is a schematic diagram of the relative positions of the stator component and the mover component in the axial section position of the linear motor provided by the present invention Figure 4 (The closed curve in the figure is the magnetic force path generated by the coil).

[0026] Figure 8 It is a schematic diagram of the relative positions of the stator component and the mover component in the axial section position of the linear motor when the stator block provided by the present invention is "n"-shaped Figure 1 (The closed curve in the figure is the magnetic force path generated by the coil).

[0027] Figure 9 It is a schematic diagram of the relative positions of the stator component and the mover component in the axial section position of the linear motor when the stator block provided by the present invention is "n"-shaped Figure 2 (The closed curve in the figure is the magnetic force path generated by the coil).

[0028] Figure 10It is a cross-sectional schematic diagram of the stator component and the mover component in the linear motor provided by the present invention.

[0029] Figure 11 It is a schematic diagram of the alternating current input to the coil provided by the present invention.

[0030] Reference numerals: 1, inner stator; 2, coil; 3, stator block; 4, notch; 5, permanent magnet; 6, wire threading space; 7, connecting bracket; 8, first column; 9, intermediate cross beam; 10, side cross beam. Detailed implementation manners

[0031] To make the objectives, technical solutions and advantages of the present invention clearer, the technical solutions in the present invention will be clearly and completely described below with reference to the accompanying drawings in the present invention. Apparently, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present invention without making creative efforts shall fall within the protection scope of the present invention.

[0032] The following combines Figures 1 to 11 to describe the linear motor of the present invention.

[0033] As Figures 1 to 11 shown, the linear motor provided by the embodiment of the present invention includes a stator component and a mover component.

[0034] Specifically, the stator component includes an inner stator 1, an outer stator and a coil 2. One of the inner stator 1 and the outer stator has a hollow cylindrical structure, and the other includes at least two groups of stator blocks 3.

[0035] In some embodiments, the inner stator 1 is set to have a hollow cylindrical structure, and the outer stator is set to have a structure form including at least two groups of stator blocks 3. Referring to Figure 10 , the stator component includes eight groups of stator blocks 3.

[0036] In other embodiments, the outer stator is set to have a hollow cylindrical structure, and the inner stator 1 is set to have a structure form including at least two groups of stator blocks 3.

[0037] The stator blocks 3 of each group are circumferentially spaced apart along the cylindrical structure. Each stator block 3 is provided with a coil 2. That is to say, the coils 2 are also grouped. The coils 2 of each group are circumferentially spaced apart along the cylindrical structure. Each group of stator blocks 3 corresponds to a group of coils 2. Around the cylindrical structure, a plurality of coils 2 are circumferentially distributed along the cylindrical structure.

[0038] The mover component includes a connecting bracket 7 and at least two groups of permanent magnets 5, and each group of permanent magnets 5 is fixedly arranged on the connecting bracket 7. The permanent magnets 5 are arranged between the stator block 3 and the cylindrical structure, and each group of permanent magnets 5 is distributed circumferentially along the cylindrical structure. Each group of stator blocks 3 corresponds to a group of permanent magnets 5.

[0039] The positions of the coils 2 and the stator blocks 3 are fixed. After the coils 2 are energized, a force is generated between each group of permanent magnets 5 and the coils 2. This force will drive the permanent magnets 5 to move relative to the coils 2, thereby driving the connecting bracket 7 to move relative to the coils 2, and thus output a linear motion. The connecting bracket 7 can be connected to a load to drive the load in a linear motion.

[0040] Each group of permanent magnets 5 includes at least two permanent magnets 5, and the permanent magnets 5 in each group are distributed along the axial direction of the cylindrical structure. The magnetization direction of the permanent magnets 5 is parallel to the distribution direction of the cylindrical structure and the corresponding stator blocks 3. For any two adjacent permanent magnets 5, the south pole of one points towards the inner stator 1, and the south pole of the other points towards the outer stator. The permanent magnets 5 have a south pole and a north pole. The south pole of the permanent magnet 5 is also called the S pole of the permanent magnet, and the north pole of the permanent magnet 5 is also called the N pole of the permanent magnet. It can be understood that the magnetization directions of any two adjacent permanent magnets 5 are opposite, realizing a radially and circumferentially heteropolar Halbach permanent magnet array.

[0041] By passing alternating current in the corresponding direction through each coil 2, an attractive or repulsive force can be generated between each coil 2 and the corresponding permanent magnet 5, ensuring that the directions of the forces on each permanent magnet 5 are the same, so that each permanent magnet 5 can jointly drive the connecting bracket 7 to move relative to the stator components such as the coils 2 along the direction of the above-mentioned force.

[0042] When the permanent magnets 5 move relative to the stator components, the coils 2 will interact with the permanent magnets 5 at different positions along the axial direction of the cylindrical structure in each group of permanent magnets 5. By switching the current direction in the coils 2, the permanent magnets 5 can be continuously subjected to a force in the same direction, so that the permanent magnets 5 can continuously move in the same direction. By increasing the number of permanent magnets 5 in each group, the stroke of the connecting bracket 7 can be increased.

[0043] With such a setting, the magnetic poles at the positions where any two adjacent permanent magnets 5 are close to each other are opposite, attracting each other. The magnetic field intensity at the positions where any two adjacent permanent magnets 5 are close to each other is enhanced, which can improve the utilization rate of magnetic energy, enhance the installation and positioning, reduce the assembly difficulty, improve the positioning accuracy, and solve the problems of difficult assembly and poor installation and positioning accuracy existing in the linear motors in the related technologies.

[0044] In addition, there are air gaps between the permanent magnet 5 and the cylindrical structure, and between the permanent magnet 5 and the stator block 3. The magnetic lines of force form a complete loop along the path of stator block 3 - air gap - cylindrical structure - air gap - stator block 3. The magnetic circuit generated by each coil 2 is a closed magnetic circuit, reducing magnetic leakage and improving the uniformity of the air gap magnetic density, thus significantly improving the magnetic efficiency.

[0045] It should be noted that the cylindrical structure is relatively fixed to the stator block 3. When each permanent magnet 5 and the connecting bracket 7 move relative to the stator component, the cylindrical structure can provide guidance, which is beneficial to improving the movement stability of the permanent magnet 5 and the connecting bracket 7.

[0046] Each group of stator blocks 3 and each group of permanent magnets 5 can form a modular structure. When assembling a linear motor, multiple groups of modules can be directly spliced inside or outside the cylindrical structure. There is an attractive force between the permanent magnets 5 of two adjacent modules, which is more convenient for assembly and can greatly improve the assembly efficiency.

[0047] In the embodiment of the present invention, the stator block 3 is provided with a wire threading space 6, and the wire threading space 6 penetrates the stator block 3 along the circumferential direction of the cylindrical structure. The setting of the wire threading space 6 provides space for the threading of the coil 2, and the coil 2 can be sleeved on any side wall of the wire threading space 6.

[0048] A notch 4 is provided on the side of the stator block 3 close to the mover component, and the notch 4 communicates with the wire threading space 6. The setting of the notch 4 divides the side of the stator block 3 close to the mover component into at least two parts. When the coil 2 is energized, due to the principle of electromagnetic induction, a magnetic field is generated around the coil 2, and the stator block 3 will be magnetized by the magnetic field generated by the coil 2. The parts of the stator block 3 on both sides of the notch 4 exhibit different polarities, and the parts of the stator block 3 on both sides of the notch 4 will generate magnetic forces with the permanent magnet 5. It is only necessary to make the directions of the forces generated by the parts of the stator block 3 on both sides of the notch 4 on the permanent magnet 5 the same.

[0049] In some embodiments, each stator block 3 is provided with two wire threading spaces 6, and the two wire threading spaces 6 are spaced apart along the axial direction of the cylindrical structure, and a columnar structure is formed between the two wire threading spaces 6.

[0050] Refer to Figures 4 to 7 , the axial cross-section of the stator block 3 is in the shape of "E", the axial cross-section of the stator block 3 coincides with the axial cross-section of the cylindrical structure, and the axial cross-section of the cylindrical structure is a cross-section passing through the central axis of the cylindrical structure. The stator block 3 has a first column 8 and three first cross-beams. The axis of the first column 8 is parallel to the central axis of the cylindrical structure, and the three first cross-beams are parallel to each other and perpendicular to the central axis of the cylindrical structure. Among the three first cross-beams, the middle first cross-beam is called the middle cross-beam 9, and the other two first cross-beams are called side cross-beams 10. The middle cross-beam 9 is the above-mentioned columnar structure formed between the two wire threading spaces 6.

[0051] Each threading space 6 can correspond to a coil 2. At this time, the coil 2 can be sleeved on the side wall of the threading space 6 away from the columnar structure. Specifically, a coil 2 can be respectively arranged on each side cross beam 10 of the stator block 3. Refer to Figure 7 ; or a coil 2 can be respectively arranged at the positions where the first upright column 8 corresponds to two threading spaces 6. Refer to Figure 6 .

[0052] Two threading spaces 6 can also correspond to a coil 2. At this time, the coil 2 can be sleeved on the columnar structure. Specifically, a coil 2 can be arranged on the middle cross beam 9 of the stator block 3. Refer to Figure 4 and Figure 5 .

[0053] Whether each threading space 6 corresponds to a coil 2 or two threading spaces 6 correspond to a coil 2, it is necessary to ensure that the ends of the two side cross beams 10 close to the cylindrical structure present the same magnetic pole, and the magnetic pole of the end of the middle cross beam 9 close to the cylindrical structure is different from the magnetic poles of the ends of the two side cross beams 10 close to the cylindrical structure.

[0054] When the axial section of the stator block 3 is in an "E" shape, the closed path of the magnetic force lines generated by the coil 2 is the middle cross beam 9 - side cross beam 10 - air gap - cylindrical structure - air gap - middle cross beam 9, forming a symmetric loop to avoid the magnetic leakage rate.

[0055] In a specific embodiment, along the axial direction of the cylindrical structure, each stator block 3 can correspond to two permanent magnets 5. Refer to Figure 4 ; or each stator block 3 can correspond to four permanent magnets 5. Refer to Figure 5 . Make the acting force between the end of one of the two side cross beams 10 and the corresponding permanent magnet 5 be an attractive force, and the acting force between the end of the other side cross beam 10 and the corresponding permanent magnet 5 be a repulsive force.

[0056] In some other embodiments, each stator block 3 is provided with a threading space 6.

[0057] Refer to Figure 8 and Figure 9 , the axial section of the stator block 3 is in an "n" shape. The stator block 3 has a second upright column and two second cross beams. The axis of the second upright column is parallel to the central axis of the cylindrical structure, and the two second cross beams are parallel to each other and both perpendicular to the central axis of the cylindrical structure.

[0058] Each threading space 6 can correspond to a coil 2. At this time, the coil 2 can be sleeved on the second upright column. Refer to Figure 8 .

[0059] It is also possible to make each wire threading space 6 correspond to two coils 2. At this time, a coil 2 can be sleeved on each of the two second cross beams respectively. Refer to Figure 9 .

[0060] Along the axial direction of the cylindrical structure, each stator block 3 can correspond to three permanent magnets 5. Refer to Figure 8 and Figure 9 .

[0061] In the embodiment of the present invention, each group of stator blocks 3 includes at least two stator blocks 3, and each of the stator blocks 3 in each group is distributed along the axial direction of the cylindrical structure.

[0062] With such a setting, along the axial direction of the cylindrical structure, the number of stator blocks 3 and coils 2 is increased. When the current values passed through the coils 2 are equal and the magnetic field intensities of each permanent magnet 5 are the same, the total driving force between the stator component and the mover component can be increased, so that the driving force that the linear motor can generate on the load can be increased.

[0063] In this embodiment, the coils 2 of the linear motor are connected in series. Specifically, the same wire can be wound at each position in sequence.

[0064] The period of alternating current refers to the time required for the current to complete a full cycle. In a standard sinusoidal alternating current, the time required to return to the initial state after a complete positive and negative change starting from any point on the waveform is called the period of alternating current. Half of the period of alternating current is called the half period of alternating current. Here, the half period of alternating current is defined as the duration of the positive current or the negative current within a single period of alternating current.

[0065] The half period of alternating current is the time required for the permanent magnet 5 to move a preset distance relative to the stator block 3. The preset distance is the length dimension of the permanent magnet 5 along the axial direction of the cylindrical structure.

[0066] The winding direction of the coil 2 on each stator block 3 can be preset to ensure that when powered by the same power supply, each stator block 3 can generate a force in the same direction on the permanent magnet 5.

[0067] When two coils 2 are arranged on each stator block 3, the winding directions of the two coils 2 on each stator block 3 are opposite.

[0068] When each group of stator blocks 3 includes at least two stator blocks 3, the winding directions of the coils 2 on each stator block 3 in each group are the same, so that the forces generated by each stator block 3 in each group on the permanent magnet 5 are in the same direction.

[0069] Since the magnetization directions of the permanent magnets 5 corresponding to two adjacent sets of stator blocks 3 are different, it is necessary to make the winding directions of the coils 2 on any two adjacent stator blocks 3 in each set of stator blocks 3 opposite to ensure that the acting forces generated by the two sets of stator blocks 3 on the permanent magnets 5 are in the same direction.

[0070] It should be noted that multiple wires can also be used, with each coil 2 corresponding to one wire, and the coils 2 of the linear motor are connected in parallel. At this time, the winding directions of the coils 2 can be the same. When connecting the coils 2 in parallel, it is necessary to pre-determine the energization directions of the coils 2.

[0071] For each of the stator blocks 3 in each group, the winding quantity and winding direction of the coils 2 on any two adjacent ones are the same.

[0072] In some embodiments, the stator block 3 includes a plurality of magnetic conductive sheets, and the plurality of magnetic conductive sheets are stacked together, and the distribution direction of the plurality of magnetic conductive sheets is arranged along the circumferential direction of the cylindrical structure.

[0073] When stacking the magnetic conductive sheets, it is necessary to control the relative positions of the magnetic conductive sheets and the distances between the magnetic conductive sheets and the cylindrical structure, so that the shape of the side of the stator block 3 close to the cylindrical structure is consistent with the side wall shape of the cylindrical structure, and the distances between each position of the side of the stator block 3 close to the cylindrical structure and the side wall of the cylindrical structure are the same.

[0074] In other embodiments, the stator block 3 is integrally formed by soft magnetic materials.

[0075] The cylindrical structure can be but is not limited to a cylindrical structure or a square cylindrical structure. When the cylindrical structure is a cylindrical structure, refer to Figure 10 , the side of the stator block 3 close to the cylindrical structure can be made into a cylindrical surface, and the magnetization direction of the permanent magnet 5 is along the diameter direction of the cylindrical structure. When the cylindrical structure is a square cylindrical structure, the side of the stator block 3 close to the cylindrical structure can be made into a flat surface, and the magnetization direction of the permanent magnet 5 is perpendicular to the side surface of the square cylindrical structure corresponding to the permanent magnet 5.

[0076] It should be noted that the shape of the permanent magnet 5 also needs to be consistent with the shape of the side surface of the cylindrical structure and the side surface of the side of the stator block 3 facing the cylindrical structure, so that the distances between each position of the permanent magnet 5 and the stator block 3 are the same, and the distances between each position of the permanent magnet 5 and the cylindrical structure are the same. When the cylindrical structure is a cylindrical structure, refer to Figure 10 , the permanent magnet 5 can be set as a sector ring column shape, and the permanent magnets 5 in each group enclose to form a hollow cylindrical shape. When the cylindrical structure is a square cylindrical structure, the permanent magnet 5 can be set as a flat plate shape.

[0077] The above-mentioned magnetic conductive sheets can be but are not limited to silicon steel sheets.

[0078] In this embodiment, the connecting bracket 7 is made of a non-magnetic material to avoid magnetic interference with the permanent magnet 5 and the coil 2.

[0079] The connecting bracket 7 can, but is not limited to, be made of aluminum alloy. Aluminum alloy has a low density, which is beneficial to reducing the mass of the connecting bracket 7 and the movement resistance of the permanent magnet 5.

[0080] In summary, the embodiment of the present invention adopts a concentric cylindrical magnetic circuit structure, and the axially moving permanent magnet 5 in the air gap formed between the inner stator 1 and the outer stator is radially magnetized. Through the collaborative design of the "E"-shaped outer stator and the radial and full-circumference heteropolar Halbach permanent magnet 5 array, a closed magnetic circuit topology is formed, optimizing the closed path of the magnetic field lines, making the magnetic field superposition more efficient, thus significantly improving the efficiency of converting magnetic energy into mechanical energy, while reducing iron loss and eddy current loss, achieving efficient drive, and having the advantages of fast dynamic response and high power density. Moreover, the assembly difficulty is greatly reduced through the pole complementary adsorption effect, systematically solving the problems of magnetic circuit loss and process installation, and providing a better solution for the field of high-frequency precision linear drive.

[0081] On the other hand, the embodiment of the present invention also provides a linear compressor, including the linear motor provided in any of the above embodiments. The linear motor provided in any of the above embodiments has high installation and positioning accuracy and low assembly difficulty. Therefore, the linear compressor provided in this embodiment has the advantages of high accuracy and easy assembly. The derivation process of the beneficial effects of the linear compressor in the embodiment of the present invention is generally similar to that of the beneficial effects of the above linear motor, so it will not be elaborated here.

[0082] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments or perform equivalent replacements for some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A linear motor, characterized in that, Comprising: A stator component, including an inner stator (1), an outer stator, and a coil (2). One of the inner stator (1) and the outer stator has a hollow cylindrical structure, and the other includes at least two groups of stator blocks (3). Each group of the stator blocks (3) is circumferentially spaced along the cylindrical structure, and each stator block (3) is provided with the coil (2); A rotor component, including a connection bracket (7) and at least two groups of permanent magnets (5). Each group of the permanent magnets (5) is fixedly arranged on the connection bracket (7). The permanent magnets (5) are arranged between the stator blocks (3) and the cylindrical structure. Each group of the permanent magnets (5) is circumferentially distributed along the cylindrical structure. Each group of the stator blocks (3) corresponds to a group of the permanent magnets (5). Each group of the permanent magnets (5) includes at least two of the permanent magnets (5). Each of the permanent magnets (5) in each group is distributed along the axial direction of the cylindrical structure. The magnetization direction of the permanent magnets (5) is parallel to the distribution direction of the cylindrical structure and the corresponding stator blocks (3). For any two adjacent permanent magnets (5), the south pole of one faces the inner stator (1), and the south pole of the other faces the outer stator.

2. The linear motor according to claim 1, wherein The stator block (3) is provided with a wire threading space (6). The wire threading space (6) penetrates the stator block (3) along the circumferential direction of the cylindrical structure. A notch (4) is provided on the side of the stator block (3) close to the rotor component. The notch (4) communicates with the wire threading space (6). The coil (2) is adapted to be sleeved on any side wall of the wire threading space (6).

3. The linear motor according to claim 2, wherein Each stator block (3) is provided with two of the wire threading spaces (6). The two wire threading spaces (6) are axially spaced along the cylindrical structure, and a columnar structure is formed between the two wire threading spaces (6); Each wire threading space (6) corresponds to one coil (2). The coil (2) is adapted to be sleeved on the side wall of the wire threading space (6) away from the columnar structure; or, two wire threading spaces (6) correspond to one coil (2), and the coil (2) is adapted to be sleeved on the columnar structure.

4. The linear motor according to claim 3, wherein Along the axial direction of the cylindrical structure, each stator block (3) corresponds to two permanent magnets (5); Or, along the axial direction of the cylindrical structure, each stator block (3) corresponds to four permanent magnets (5).

5. The linear motor according to claim 2, characterized in that, Each stator block (3) is provided with one wire threading space (6). Along the axial direction of the cylindrical structure, each stator block (3) corresponds to three permanent magnets (5); Each wire threading space (6) corresponds to one coil (2), or each wire threading space (6) corresponds to two coils (2).

6. The linear motor according to any one of claims 1-5, characterized in that, Each group of the stator blocks (3) includes at least two of the stator blocks (3). Each of the stator blocks (3) in each group is axially distributed along the cylindrical structure.

7. The linear motor according to claim 6, characterized in that, All the coils (2) are connected in series. Among each group of the stator blocks (3), the winding directions of the coils (2) on any two adjacent groups of the stator blocks (3) are opposite; When two of the coils (2) are provided on each of the stator blocks (3), the winding directions of the two coils (2) on each stator block (3) are opposite.

8. The linear motor according to claim 6, wherein, For each of the stator blocks (3) in each group, the winding numbers and winding directions of the coils (2) of any two adjacent ones are the same.

9. The linear motor according to any one of claims 1-5, characterized in that, The stator block (3) is integrally formed of a soft magnetic material, or the stator block (3) includes a plurality of magnetic conductive sheets, and the plurality of magnetic conductive sheets are stacked together; And / or, the connecting bracket (7) is made of a non-magnetic conductive material.

10. A linear compressor, characterized in that, It includes a linear motor according to any one of claims 1 to 9.

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