Linear motor

Abstract

The invention relates to a linear motor, which comprises a stator group and a rotor group, the stator group is provided with stator permanent magnets, the rotor group is provided with rotor permanent magnets, an air gap is arranged between the stator group and the rotor group, and the rotor group is of a consequent pole structure in which the rotor permanent magnets and rotor magnetizers are alternately arranged. Therefore, the stator group and the rotor group are both provided with permanent magnets, and the rotor group adopts a consequent pole structure, so that air gap magnetic conductance harmonic waves are generated to serve as modulation blocks to modulate a stator permanent magnetic field. Compared with a single-side permanent magnet linear motor, the space utilization rate of the stator set and the rotor set is higher, thrust is generated through the bilateral magnetic field modulation effect, the thrust is equivalent to superposition of a stator permanent magnet linear motor and a rotor permanent magnet linear motor, and the advantage of high thrust is achieved.

Description

Technical Field

[0001] This disclosure relates to the field of motor technology, and more particularly to a linear motor. Background Technology

[0002] Linear permanent magnet motors are widely used in applications requiring linear motion, offering advantages such as simple structure and fast dynamic response. However, in related technologies, linear permanent magnet motors typically employ a single-sided permanent magnet only on the stator or mover side, resulting in limited thrust density. Summary of the Invention

[0003] To overcome the problems existing in related technologies, this disclosure provides a linear motor.

[0004] According to a first aspect of the present disclosure, a linear motor is provided, including a stator assembly and a mover assembly. The stator assembly is provided with a stator permanent magnet, and the mover assembly is provided with a mover permanent magnet. An air gap exists between the stator assembly and the mover assembly. The mover assembly is constructed as an alternating pole structure in which the mover permanent magnet and the mover magnetic conductor are alternately arranged.

[0005] In some possible implementations, the linear motor includes one stator assembly and two mover assemblies, with the two mover assemblies respectively disposed on both sides of the stator assembly. The double-sided mover structure effectively counteracts unbalanced normal forces, eliminates the inherent unbalanced magnetic attraction problem of a single-sided structure, and eliminates fluctuations in normal forces, resulting in extremely smooth mover operation with almost no vibration, and producing twice the thrust of a single-sided structure.

[0006] In some possible implementations, the magnetization directions of the permanent magnets in the two mover groups are opposite. This configuration provides a mirror-symmetrical working environment for the two mover groups, ensuring that the normal force amplitudes generated by the two mover groups are equal, and that the two normal forces can cancel each other out, thereby reducing magnetic wear, lowering friction and vibration, and improving the smoothness of the linear motor's motion.

[0007] In some possible implementations, each mover assembly includes multiple mover permanent magnets, and the magnetization direction of the multiple mover permanent magnets in the same mover assembly is the same. A unified magnetization direction of the permanent magnets can significantly reduce production costs, and combined with a magnetic conductor, can generate a very high air gap magnetic flux density to achieve a high thrust density.

[0008] In some possible implementations, the mover permanent magnet is magnetized along the arrangement direction of the stator group and the mover group. The magnetic field lines pass perpendicularly through the air gap, with a direct path, which can effectively establish a strong magnetic field and increase thrust.

[0009] In some possible implementations, the stator assembly includes multiple interconnected stator units. Each stator unit includes a first magnetic conductor, a first stator permanent magnet, a second magnetic conductor, and a second stator permanent magnet arranged sequentially adjacent to each other. Each stator unit also includes an armature winding wound around the first magnetic conductor. The stator adopts a modular structure, offering flexible layout and facilitating expansion or reduction according to different design requirements. Furthermore, the stator coils are independent of each other, providing strong fault tolerance.

[0010] In some possible implementations, the first stator permanent magnet, the second magnetic conductor, and the second stator permanent magnet are connected to form a permanent magnet module with an integrated structure. The permanent magnet module utilizes the magnetic focusing effect to enhance the stator permanent magnet magnetic field, and the modular structure facilitates manufacturing and flexible layout.

[0011] In some possible implementations, the first stator permanent magnet, the second magnetic conductor, and the second stator permanent magnet are sequentially bonded together to form the permanent magnet module. In complex magnet arrays, it is necessary to precisely fix components of different materials or shapes onto a single structure. Traditional mechanical fixing methods, such as screws and clips, may interfere with the magnetic field; therefore, bonding is more suitable.

[0012] In some possible implementations, the first stator permanent magnet and the second stator permanent magnet are magnetized in opposite directions. The first stator permanent magnet and the second stator permanent magnet have opposite poles facing each other, and the magnetic field lines between them pass through the air gap to form a complete magnetic circuit. This allows the magnetic flux density in the air gap to reach a very high level, generating a strong electromagnetic force.

[0013] In some possible implementations, the first stator permanent magnet and the second stator permanent magnet are magnetized along the arrangement direction of the plurality of stator units. This arrangement can concentrate the magnetic field almost on the working air gap side, improving magnetic field utilization, reducing magnetic leakage, and facilitating the implementation of a double-sided mover design.

[0014] In some possible implementations, the cross-section of the second magnetic conductor is rectangular. A cuboid is the easiest shape to obtain through machining methods such as cutting / grinding, offering low cost, high efficiency, and ease of positioning and installation.

[0015] In some possible implementations, the second magnetic conductor is not wound around the armature winding. The armature winding is only wound around the first magnetic conductor, so that the second magnetic conductor in this embodiment of the present disclosure only serves as a magnetic circuit conductor and not as a modulator of the permanent magnet magnetic field of the mover, thus avoiding magnetic field interference, and allowing the first and second magnetic conductors to function independently for different purposes.

[0016] In some possible implementations, the first magnetic conductor has an H-shaped cross-section, and the armature winding is wound around the H-shaped beam of the first magnetic conductor. The H-shaped structure itself is a basically closed magnetic circuit, and the magnetic flux is well confined within the magnetic conductor and the air gap, resulting in very little stray magnetic field leakage to the outside and high magnetic energy utilization. In addition, the H-shaped magnetic conductor has good mechanical stability and can withstand electromagnetic forces without easily deforming.

[0017] In some possible implementations, the number of air gap magnetic field pole pairs generated by the stator permanent magnet magnetic field modulated by the mover iron pole is |iZ±mPr|, and the number of air gap magnetic field pole pairs generated by the mover permanent magnet magnetic field modulated by the stator tooth core is |kPr±jZ|. The number of armature magnetic field pole pairs Pa, the number of mover alternating pole units Pr, and the number of stator teeth Z should satisfy the following relationship: nPa=|iZ±mPr|=|kPr±jZ|. The stator permanent magnet magnetic field, after being modulated by the mover conductor, interacts with the armature magnetic field to generate thrust, and the mover permanent magnet magnetic field, after being modulated by the stator conductor, interacts with the armature magnetic field to generate thrust. The sum of these two forces constitutes the total thrust generated by the motor.

[0018] The technical solutions provided by the embodiments of this disclosure can include the following beneficial effects: both the stator and mover groups are equipped with permanent magnets, and the mover group adopts an alternating pole structure to generate air gap magnetic permeability harmonics as modulation blocks to modulate the stator permanent magnet magnetic field. Compared with a single-sided permanent magnet linear motor, the stator and mover groups have higher space utilization and generate thrust by utilizing the bilateral magnetic field modulation effect, which is equivalent to the superposition of a stator permanent magnet linear motor and a mover permanent magnet linear motor, and has the advantage of high thrust.

[0019] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this disclosure. Attached Figure Description

[0020] The accompanying drawings, which are incorporated in and form a part of this specification, illustrate embodiments consistent with this disclosure and, together with the description, serve to explain the principles of this disclosure.

[0021] Figure 1 This is a schematic diagram of the structure of a linear motor according to an exemplary embodiment.

[0022] Figure 2 This is a schematic diagram of a first magnetic conductor in a linear motor according to an exemplary embodiment.

[0023] Figure 3 This is a schematic diagram of a permanent magnet module in a linear motor according to an exemplary embodiment.

[0024] Figure 4 This is a schematic diagram of a mover assembly in a linear motor according to an exemplary embodiment.

[0025] Figure 5 This is a schematic diagram of the main magnetic circuit of the stator permanent magnet field when the three-phase electrical phase is 0 degrees, according to an exemplary embodiment.

[0026] Figure 6 This is a schematic diagram of the main magnetic circuit of the stator permanent magnet field when the three-phase electrical phase is 90 degrees, according to an exemplary embodiment.

[0027] Figure 7 This is a schematic diagram of the main magnetic circuit of the stator permanent magnet field when the three-phase electrical phase is 180 degrees, according to an exemplary embodiment.

[0028] Figure 8 This is a schematic diagram of the main magnetic circuit of the permanent magnet of the mover when the three-phase electrical phase is 0 degrees, according to an exemplary embodiment.

[0029] Figure 9 This is a schematic diagram of the main magnetic circuit of the permanent magnet of the mover when the three-phase electrical phase is 90 degrees, according to an exemplary embodiment.

[0030] Figure 10 This is a schematic diagram of the main magnetic circuit of the permanent magnet of the mover when the three-phase electrical phase is 180 degrees, according to an exemplary embodiment.

[0031] Figure 11 This is a schematic diagram of the stator assembly according to an exemplary embodiment.

[0032] Figure 12 This is a stator permanent magnet magnetomotive force waveform shown according to an exemplary embodiment.

[0033] Figure 13 This is a stator air gap magnetic permeability waveform shown according to an exemplary embodiment.

[0034] Figure 14 This is a schematic diagram of the structure of a moving part assembly according to an exemplary embodiment.

[0035] Figure 15 This is a magnetomotive force waveform of a moving permanent magnet shown according to an exemplary embodiment.

[0036] Figure 16 This is a moving part air gap magnetic permeability waveform shown according to an exemplary embodiment.

[0037] Figure 17 It is the air gap magnetic field harmonic of a linear motor as illustrated in an exemplary embodiment.

[0038] Explanation of reference numerals in the attached figures 1-Stator assembly; 11-First magnetic conductor; 12-First stator permanent magnet; 13-Second magnetic conductor; 14-Second stator permanent magnet; 15-Armature winding; 10-Permanent magnet module; 2-Motor assembly; 21-Motor permanent magnet; 22-Motor magnetic conductor. Detailed Implementation

[0039] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numerals in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this disclosure. Rather, they are merely examples of apparatuses consistent with some aspects of this disclosure as detailed in the appended claims.

[0040] In related technologies, linear permanent magnet motors typically use a single-sided permanent magnet only on the stator or mover side, resulting in limited thrust density.

[0041] In view of this, such as Figures 1 to 4 As shown, this disclosure provides a linear motor, which may include a stator group 1 and a mover group 2. The stator group 1 is provided with a stator permanent magnet, and the mover group 2 is provided with a mover permanent magnet 21. There is an air gap between the stator group 1 and the mover group 2. The mover group 2 is constructed as an alternating pole structure in which the mover permanent magnet 21 and the mover magnetic conductor 22 are arranged alternately.

[0042] Through the above technical solution, both the stator and mover groups are equipped with permanent magnets. The mover group adopts an alternating pole structure to generate air gap magnetic permeability harmonics as modulation blocks to modulate the stator permanent magnet magnetic field. Compared with single-sided permanent magnet linear motors, the stator and mover groups have higher space utilization and generate thrust by utilizing the bilateral magnetic field modulation effect, which is equivalent to the superposition of stator permanent magnet linear motors and mover permanent magnet linear motors, and has the advantage of high thrust.

[0043] In embodiments of this disclosure, reference is made to Figure 1 , Figure 4 A linear motor may include a stator assembly 1 and two mover assemblies 2, with the two mover assemblies 2 respectively disposed on both sides of the stator assembly 1. In a traditional single-sided stator-motor structure, because the magnetic field's attraction to the magnetically conductive components exists only on one side, the air gap magnetic field between the stator and mover will generate an unbalanced force, which will affect the operation of the linear motor. In this embodiment, a double-sided mover structure is adopted, so that the normal forces generated by the air gap magnetic fields on both sides are in opposite directions, which can effectively cancel the unbalanced normal force, eliminate the inherent unbalanced magnetic attraction problem of the single-sided structure, eliminate the fluctuation of the normal force, make the mover run extremely smoothly with almost no vibration, and the thrust is twice that of the single-sided structure.

[0044] Among them, reference Figure 1 , Figure 4 The magnetization directions of the permanent magnets 21 in the two mover groups 2 are opposite, which provides a mirror-symmetric working environment for the two mover groups 2, ensuring that the normal force amplitude generated by the two mover groups 2 is equal, and the two normal forces can cancel each other out, thereby reducing magnetic force wear, reducing friction and vibration, and improving the motion stability of the linear motor.

[0045] Further, refer to Figure 1 , Figure 4 Each mover group 2 may include multiple mover permanent magnets 21, and the magnetization direction of the multiple mover permanent magnets 21 in the same mover group 2 is the same. Unifying the magnetization direction of the permanent magnets can significantly reduce production costs, and combined with the magnetic conductor, it can generate a very high air gap magnetic flux density to obtain a high thrust density.

[0046] Further, refer to Figure 1 , Figure 4 The permanent magnet 21 of the mover can be magnetized along the arrangement direction of the stator group 1 and the mover group 2, that is, magnetized perpendicular to the direction of the mover's motion. The magnetic field lines pass perpendicularly through the air gap, and the magnetic circuit path is direct, which can effectively establish a strong magnetic field and improve the thrust.

[0047] As an exemplary embodiment of this disclosure, reference is made to Figure 1 The stator group 1 may include multiple connected stator units. Each stator unit may include a first magnetic conductor 11, a first stator permanent magnet 12, a second magnetic conductor 13, and a second stator permanent magnet 14 arranged sequentially adjacent to each other. Each stator unit may also include an armature winding 15, which is wound around the first magnetic conductor 11. The aforementioned permanent magnet can be an iron core. The armature winding 15 is wound around the yoke of the first magnetic conductor 11. The short end length of the coil helps to reduce the motor size and improve efficiency. Specifically, three stator units connected together form a three-phase stator unit, and one or more three-phase stator units connected together form a complete three-phase linear motor stator. The stator adopts a modular structure, allowing for flexible layout and easy expansion or shortening according to different design requirements. Simultaneously, the stator coils are independent of each other, providing strong fault tolerance.

[0048] When the armature winding 15 is energized, it generates an armature magnetic field. The stator permanent magnet magnetic field, modulated by the mover magnet 22, interacts with the armature magnetic field to generate thrust. The mover permanent magnet magnetic field, modulated by the first magnet 11 of the stator assembly 1, interacts with the armature magnetic field to generate thrust. The sum of these two forces constitutes the total thrust generated by the motor. The first magnet 11 provides the winding yoke for the armature winding 15 and modulates the mover permanent magnet magnetic field. The second magnet 13 can focus and conduct the permanent magnet magnetic fields of the first stator permanent magnet 12 and the second stator permanent magnet 14 on both sides, thereby enhancing the stator permanent magnet magnetic field.

[0049] According to some embodiments, reference Figure 3The first stator permanent magnet 12, the second magnetic conductor 13, and the second stator permanent magnet 14 can be connected to form an integrated permanent magnet module 10. The modular structure facilitates manufacturing and offers flexible layout. Since linear motors lack curved surfaces, this modular structure is highly suitable for linear motor applications. This design utilizes the magnetic focusing effect to enhance the stator permanent magnet magnetic field, with each permanent magnet module 10 generating a magnetic field with one pole pair. Compared to existing single-sided permanent magnet structures, where the number of stator permanent magnet pole pairs is half the number of teeth, it's impossible to create a double-sided permanent magnet linear motor by directly adding permanent magnets to the mover side. This is because the pole pair count cannot match after adding permanent magnets to the mover, resulting in thrust cancellation and no thrust superposition effect. In this embodiment, each permanent magnet module 10 generates a magnetic field with one pole pair, meaning the number of stator permanent magnet pole pairs is the same as the number of teeth. Therefore, in this embodiment, permanent magnets can be added to the mover assembly 2, making the linear motor in this embodiment a double-sided permanent magnet motor.

[0050] Furthermore, the first stator permanent magnet 12, the second magnetic conductor 13, and the second stator permanent magnet 14 can be sequentially bonded together to form a permanent magnet module 10. In complex magnet arrays, it is necessary to precisely fix components of different materials or shapes onto an integral structure. Traditional mechanical fixing methods, such as screws and clips, may interfere with the magnetic field. Therefore, bonding is more suitable.

[0051] Among them, reference Figure 3 The first stator permanent magnet 12 and the second stator permanent magnet 14 are magnetized in opposite directions. The opposite poles of the first stator permanent magnet 12 and the second stator permanent magnet 14 are opposite to each other, and the magnetic field lines between them will pass through the air gap to form a complete magnetic circuit. This makes the magnetic flux density in the air gap reach a very high level, generating a strong electromagnetic force.

[0052] Further, refer to Figure 1 The first stator permanent magnet 12 and the second stator permanent magnet 14 can be magnetized along the arrangement direction of multiple stator units, respectively. This arrangement can concentrate the magnetic field almost on the working air gap side, improve the magnetic field utilization, reduce magnetic leakage, and facilitate the realization of a double-sided mover design.

[0053] In some embodiments, reference Figure 3The cross-section of the second magnetic conductor 13 can be constructed as a rectangle. A cuboid is the easiest shape to obtain through machining methods such as cutting / grinding, resulting in low cost, high efficiency, and ease of positioning and installation. Since the purpose of the second magnetic conductor 13 in this embodiment is to conduct magnetic fields, rather than constraining the armature magnetic field and modulating the permanent magnet magnetic field of the stator as the first magnetic conductor 11 does, the second magnetic conductor 13 is constructed as a rectangle in this embodiment. For example, it can be constructed as a rectangle that matches the contact surface of the first stator permanent magnet 12 and the second stator permanent magnet 14, allowing the magnetic fields of the permanent magnets on both sides to be fully conducted within the second magnetic conductor 13. Compared to other irregular structures, this reduces magnetic resistance and ensures a magnetic focusing effect.

[0054] In this embodiment, the second magnetic conductor 13 is not wound around the armature winding 15, and the armature winding 15 is only wound around the first magnetic conductor 11. This means that the second magnetic conductor 13 in this embodiment only serves as a magnetic circuit conductor and does not serve as a modulator of the permanent magnet magnetic field of the mover, thus avoiding magnetic field interference. This allows the first magnetic conductor 11 and the second magnetic conductor 13 to function independently for different purposes.

[0055] According to some embodiments, reference Figure 2 The cross-section of the first magnetic conductor 11 can be constructed in an H-shape, and the armature winding 15 can be wound around the H-shaped crossbeam of the first magnetic conductor 11. The H-shaped core is constructed with an open slot structure, and the toothed core acts as a modulation block to modulate the permanent magnet magnetic field of the mover. The H-shaped structure itself is a basically closed magnetic circuit, and the magnetic flux is well confined within the magnetic conductor and the air gap, resulting in very little stray magnetic field leakage to the outside and high magnetic energy utilization. In addition, the H-shaped magnetic conductor has good mechanical stability and can withstand electromagnetic forces without easily deforming.

[0056] The main magnetic circuits of the stator permanent magnet field and the mover permanent magnet field at different positions are as follows: Figures 5 to 7 and Figures 8 to 10 As shown, the stator permanent magnet magnetic field and the mover permanent magnet magnetic field are in the same direction as the coil linkage. The stator permanent magnet linkage and the mover permanent magnet linkage are superimposed on each other, and the back electromotive force and thrust generated by them are also superimposed on each other. Therefore, the linear motor proposed in this disclosure can effectively utilize the double-sided permanent magnets to increase thrust.

[0057] The superposition effect of bilateral permanent magnets is achieved through the principle of magnetic field modulation. This will be illustrated using the upper air gap magnetic field as an example. Figure 11 and Figure 14 These are schematic diagrams of the stator and mover groups, respectively. The magnetomotive force waveforms of the permanent magnets and the air gap permeability waveforms of the stator and mover are shown below. Figures 12 to 13 and Figures 15 to 16As shown. Because each stator unit's permanent magnet module 10 contains two permanent magnets with opposite magnetization directions, the number of fundamental pole pairs of the permanent magnet magnetomotive force in each stator unit is 1. The number of fundamental pole pairs of the air gap magnetic permeability generated by the permanent magnet module 10 and the first magnetic conductor 11 within one stator tooth pitch is also 1, and the air gap magnetic permeability contains a DC component. Therefore, if the number of stator teeth is Z, then the number of stator permanent magnet magnetomotive force pole pairs is iZ, and the number of stator air gap magnetic permeability pole pairs is jZ, where i is an integer greater than or equal to 1, and j is an integer greater than or equal to 0. The mover has an alternating pole structure, which can generate air gap magnetic permeability harmonics as a modulation block while generating permanent magnet magnetic field excitation. Each permanent magnet-magnetic conductor alternating pole unit generates a permanent magnet magnetomotive force and air gap magnetic permeability harmonics with a fundamental pole pair number of 1, where the air gap magnetic permeability contains a DC component. Therefore, if the number of alternating pole units of the mover is Pr, then the number of magnetomotive force pole pairs of the mover permanent magnet is kPr, and the number of magnetic permeability pole pairs of the mover air gap is mPr, where k is an integer greater than or equal to 1 and m is an integer greater than or equal to 0.

[0058] refer to Figure 17 The number of pole pairs in the air gap magnetic field generated by the stator permanent magnet magnetic field modulated by the mover iron poles is |iZ±mPr|, and the number of pole pairs in the air gap magnetic field generated by the mover permanent magnet magnetic field modulated by the stator tooth core is |kPr±jZ|. For the two magnetic fields to generate a force with a non-zero average value, they must satisfy the conditions of equal pole pairs, the same direction of motion, and equal velocity. Let the number of pole pairs in the armature magnetic field be Pa, then its harmonic pole pairs are nPa, where n is an integer greater than or equal to 1. Therefore, to achieve thrust generation using bilateral permanent magnets, the number of pole pairs in the armature magnetic field Pa, the number of alternating pole units in the mover Pr, and the number of stator teeth Z should satisfy the following relationship: nPa = |iZ±mPr| = |kPr±jZ|. At this time, the stator permanent magnet magnetic field, after being modulated by the mover conductor magnet 22, interacts with the armature magnetic field to generate thrust, and the mover permanent magnet magnetic field, after being modulated by the stator conductor magnet, interacts with the armature magnetic field to generate thrust. The sum of these two forces constitutes the total thrust generated by the motor. Therefore, this linear motor can effectively utilize the principle of bilateral magnetic field modulation to increase thrust.

[0059] In the above detailed description, reference has been made to the accompanying drawings, which illustrate specific aspects of this disclosure by way of illustration. In this regard, terms indicating direction or positional relationship, such as “center,” “longitudinal,” “lateral,” “length,” “width,” “thickness,” “upper,” “lower,” “front,” “rear,” “left,” “right,” “vertical,” “horizontal,” “top,” “bottom,” “inner,” “outer,” “clockwise,” “counterclockwise,” “axial,” “radial,” and “circumferential,” are used with reference to the orientation of the described figures. Since components of the described device can be positioned in multiple different orientations, directional terms are used for illustrative purposes and not for limitation. It should be understood that other aspects can be utilized and structural or logical changes can be made without departing from the concept of this disclosure. Therefore, the following detailed description should not be considered limiting.

[0060] It should be understood that, unless otherwise specifically indicated, features of various embodiments of this disclosure described herein can be combined with each other. As used herein, the term “and / or” includes any one of the relevant listed items and any combination of any two or more; similarly, “at least one of…” includes any one of the relevant listed items and any combination of any two or more.

[0061] It should be understood that, unless otherwise expressly specified and limited, the terms "joining," "attaching," "installing," "connecting," "linking," "fixing," etc., used in the embodiments of this disclosure should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms herein based on the specific circumstances.

[0062] Furthermore, the term "above" as used herein with respect to components, elements, or material layers formed or located "above" a surface may be used to indicate that the component, element, or material layer is "indirectly" positioned (e.g., placed, formed, deposited, etc.) on the surface such that one or more additional components, elements, or layers are arranged between the surface and the component, element, or material layer. However, the term "above" as used with respect to components, elements, or material layers formed or located "above" a surface may also optionally have a specific meaning: that the component, element, or material layer is "directly" positioned (e.g., placed, formed, deposited, etc.) on the surface, for example, in direct contact with the surface.

[0063] Although terms such as “first,” “second,” and “third” may be used herein to describe various components, parts, regions, layers, or sections, these components, parts, regions, layers, or sections are not limited to these terms. Rather, these terms are used only to distinguish one component, part, region, layer, or section from another. Therefore, without departing from the teachings of the examples described herein, the first component, part, region, layer, or section mentioned in the examples may also be referred to as the second component, part, region, layer, or section. Furthermore, the terms “first” and “second” are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as “first” or “second” may explicitly or implicitly include at least one of that feature. In the description herein, “a plurality” means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0064] It should be understood that spatial relative terms, such as “above,” “upper,” “below,” and “lower,” are used herein to describe the relationship between one element and another shown in the figures. In addition to the orientation depicted in the figures, these spatial relative terms are also intended to encompass different orientations of the device in use or operation. For example, if the device in the figures is flipped, an element described as “above” or “upper” relative to another element would be “below” or “lower” relative to that other element. Thus, depending on the spatial orientation of the device, the term “above” encompasses both above and below orientations. Devices may have other orientations (e.g., rotated 90 degrees or in other orientations), and the spatial relative terms used herein should be interpreted accordingly.

[0065] Furthermore, the term “exemplary” is used herein to mean serving as an example, instance, or illustration. Any aspect or design described herein as “exemplary” is not necessarily to be construed as advantageous compared to other aspects or designs. Rather, the use of the term “exemplary” is intended to present the concept in a concrete manner. As used herein, the term “or” is intended to mean an inclusive “or” rather than an exclusive “or.” That is, unless otherwise specified or clear from the context, “X applies A or B” is intended to mean any of the natural inclusive arrangements. That is, “X applies A or B” satisfies any of the foregoing instances if X applies A; X applies B; or both X applies A and B. Additionally, unless otherwise specified or clear from the context to refer to the singular form, the articles “a” and “an” as used in this application and the appended claims are generally understood to mean “one or more.”

[0066] Similarly, although this disclosure has been shown and described with respect to one or more implementations, equivalent variations and modifications will occur to those skilled in the art upon reading and understanding this specification and the accompanying drawings. This disclosure includes all such modifications and variations and is limited only by the scope of the claims. In particular, with respect to the various functions performed by the components described above (e.g., elements, resources, etc.), unless otherwise indicated, the terminology used to describe such components is intended to correspond to any component (functionally equivalent) that performs the specific function of the described component, even if structurally not equivalent to the disclosed structure. Furthermore, although specific features of this disclosure may have been disclosed with respect to only one of several implementations, such features may be combined with one or more other features of other implementations, as may be desired and advantageous to any given or particular application. Moreover, with regard to the terms “comprising,” “owning,” “having,” “having,” or variations thereof as used in the detailed description or claims, such terms are intended to be inclusive in a manner similar to the term “including.”

[0067] Other embodiments of this disclosure will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of this disclosure that follow the general principles of this disclosure and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this disclosure are indicated by the appended claims.

[0068] It should be understood that this disclosure is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this disclosure is limited only by the appended claims.

Claims

1. A linear motor, characterized in that, It includes a stator group and a mover group. The stator group is provided with a stator permanent magnet, and the mover group is provided with a mover permanent magnet. There is an air gap between the stator group and the mover group. The mover group is constructed as an alternating pole structure in which the mover permanent magnet and the mover magnetic conductor are arranged alternately.

2. The linear motor according to claim 1, characterized in that, The linear motor includes one stator assembly and two mover assemblies, with the two mover assemblies respectively disposed on both sides of the stator assembly.

3. The linear motor according to claim 2, characterized in that, The magnetization directions of the permanent magnets in the two said mover groups are opposite.

4. The linear motor according to claim 3, characterized in that, Each of the mover groups includes a plurality of mover permanent magnets, and the magnetization direction of the plurality of mover permanent magnets in the same mover group is the same.

5. The linear motor according to claim 2, characterized in that, The moving permanent magnet is magnetized along the arrangement direction of the stator group and the moving group.

6. The linear motor according to claim 1, characterized in that, The stator assembly includes multiple connected stator units. Each stator unit includes a first magnetic conductor, a first stator permanent magnet, a second magnetic conductor, and a second stator permanent magnet arranged sequentially adjacent to each other. Each stator unit also includes an armature winding wound around the first magnetic conductor.

7. The linear motor according to claim 6, characterized in that, The first stator permanent magnet, the second magnetic conductor, and the second stator permanent magnet are connected to form a permanent magnet module with an integrated structure.

8. The linear motor according to claim 7, characterized in that, The first stator permanent magnet, the second magnetic conductor, and the second stator permanent magnet are sequentially bonded together to form the permanent magnet module.

9. The linear motor according to claim 6, characterized in that, The first stator permanent magnet and the second stator permanent magnet are magnetized in opposite directions.

10. The linear motor according to claim 9, characterized in that, The first stator permanent magnet and the second stator permanent magnet are respectively magnetized along the arrangement direction of the plurality of stator units.

11. The linear motor according to claim 6, characterized in that, The cross-sectional structure of the second magnetic conductor is rectangular.

12. The linear motor according to claim 6, characterized in that, The second magnetic conductor does not wrap around the armature winding.

13. The linear motor according to claim 6, characterized in that, The first magnetic conductor has an H-shaped cross-section, and the armature winding is wound on the H-shaped beam of the first magnetic conductor.

14. The linear motor according to claim 6, characterized in that, The number of air gap magnetic field pole pairs generated by the modulation of the stator permanent magnet magnetic field by the mover iron pole is |iZ±mPr|, and the number of air gap magnetic field pole pairs generated by the modulation of the mover permanent magnet magnetic field by the stator tooth core is |kPr±jZ|. The number of armature magnetic field pole pairs Pa, the number of mover alternating pole units Pr, and the number of stator teeth Z should satisfy the following relationship: nPa=|iZ±mPr|=|kPr±jZ|.

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