A dual-secondary modular permanent magnet flux switching linear motor and its manufacturing method

Abstract

This invention belongs to the field of permanent magnet motor technology, specifically relating to a dual-secondary modular permanent magnet flux switching linear motor and its manufacturing method, comprising a motor primary and a motor secondary, with an air gap structure provided between the motor primary and the motor secondary; wherein, the motor primary includes at least one motor primary module with identical structure; the motor primary module includes an iron core, a permanent magnet, and an armature coil; the permanent magnet is placed inside the iron core, and the permanent magnet is distributed in a double U-shape around the armature coil; the motor secondary adopts an axisymmetric double-sided secondary structure composed of an iron core.

Description

Technical Field

[0001] This invention belongs to the field of permanent magnet motor technology, specifically relating to a dual-secondary modular permanent magnet flux switching linear motor and its manufacturing method. Background Technology

[0002] The statements in this section are merely background information related to the present invention and do not necessarily constitute prior art.

[0003] Permanent magnet flux switching linear motors are primary permanent magnet linear motors, meaning that both the permanent magnet and armature winding are located on the primary side, while the secondary side consists only of the iron core. The secondary side has neither permanent magnets nor windings, resulting in a simple and reliable structure. In particular, the short primary and long secondary structure is very suitable for long-stroke applications. At the same time, this type of motor also features high power density, high efficiency, good fault tolerance, and flexible control.

[0004] According to the inventors, the primary core of existing permanent magnet flux switching linear motors generally adopts a split U-shaped or I-shaped structure, with the permanent magnet placed between the two core sections. That is, the two core sections are separated by the permanent magnet, resulting in low overall structural strength and poor integrity, generally requiring external mechanical fastening devices. The distribution of permanent magnets is singular, and the amount used is limited by the structural form, making it difficult to improve the excitation effect within a limited volume. It is also unsuitable to use low-grade or low-energy-product permanent magnets, making it difficult to increase the thrust density of the motor. When adopting a modular design, the motor modules lack versatility and cannot be designed into longitudinal or transverse flux structures as needed based on the same motor module, while also having good fault tolerance performance. Summary of the Invention

[0005] To address the aforementioned issues, this invention proposes a dual-secondary modular permanent magnet flux switching linear motor and its manufacturing method. The permanent magnet is placed inside the iron core, ensuring a highly integrated structure for the primary module without the need for external mechanical fastening measures. The multi-phase motor structure with symmetrical longitudinal or transverse flux can be designed as needed, solving the problem of poor overall integrity of existing permanent magnet flux switching linear motor modules and improving the excitation effect of the permanent magnet and the thrust density of the motor.

[0006] According to some embodiments, the first aspect of the present invention provides a dual-secondary modular permanent magnet flux switching linear motor, which adopts the following technical solution:

[0007] A dual-secondary modular permanent magnet flux-switching linear motor includes a primary motor and a secondary motor, with an air gap structure between the primary and secondary motors. The primary motor includes at least one identical primary motor module. Each primary motor module includes an iron core, a permanent magnet, and an armature coil. The permanent magnet is placed inside the iron core and is arranged in a double U-shape around the armature coil. The secondary motor adopts an axisymmetric double-sided secondary structure composed of an iron core.

[0008] As a further technical limitation, both the primary and secondary windings of the motor are made of stacked silicon steel sheets.

[0009] As a further technical limitation, the primary module of the motor is divided into an H-shaped region and two U-shaped regions by a permanent magnet, and the H-shaped region is connected to the two U-shaped regions to form a continuous whole through a narrow magnetic bridge.

[0010] Furthermore, the primary module of the motor includes six segments of permanent magnets arranged in a segmented manner, wherein each segment of permanent magnet is disposed between the H-shaped region and the U-shaped region of the core of the primary module of the motor; the magnetization direction of the permanent magnets all points to the U-shaped region or the H-shaped region.

[0011] As a further technical limitation, the iron core near the air gap structure in the primary module of the motor is the primary tooth; the primary module of the motor has an axisymmetric structure.

[0012] Furthermore, the width of the primary teeth along the axis of symmetry of the primary module of the motor remains consistent, the tooth pitch of adjacent primary teeth remains consistent, and the width of the primary teeth is smaller than the tooth pitch of adjacent primary teeth.

[0013] As a further technical limitation, the armature coil adopts a centralized armature coil, and the air portion formed on the inside of the upper and lower U-shaped iron core areas is used as a slot for winding the central armature coil.

[0014] As a further technical limitation, the portion of the iron core in the secondary winding of the motor that protrudes from the air gap structure is a secondary tooth.

[0015] Furthermore, the width of the secondary teeth along the direction of the secondary axis of symmetry of the motor is equal, and the pitch of adjacent secondary teeth along the direction of the secondary axis of symmetry of the motor is equal.

[0016] According to some embodiments, a second aspect of the present invention provides a method for manufacturing a dual-secondary modular permanent magnet flux-switching linear motor, employing the following technical solution:

[0017] A method for manufacturing a dual-secondary modular permanent magnet flux-switching linear motor includes:

[0018] By placing the permanent magnets in the primary module of the motor between the H-shaped and U-shaped regions of the iron core, an integrated structure of the primary module of the motor can be formed without the need for external mechanical fastening measures. The permanent magnets in the primary module of the motor are distributed in a double U-shape around the armature coil.

[0019] By designing a single primary motor module into a symmetrical multiphase structure with longitudinal or transverse magnetic flux as needed, a dual-secondary modular permanent magnet flux switching linear motor can be manufactured.

[0020] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0021] The primary motor in this invention adopts a modular design, with each module having an identical structure. The permanent magnet is embedded inside the iron core, making the primary module simple, robust, and highly rigid. At the same time, the permanent magnet has a better excitation effect, which can effectively improve the thrust density of the motor. Furthermore, permanent magnets with low magnetic energy product or without rare earth materials can be used. Based on the same motor module, a symmetrical multiphase structure with longitudinal or transverse magnetic flux can be formed into a multiphase motor structure.

[0022] The permanent magnets in each motor primary module are placed between one H-shaped region and two U-shaped regions of the iron core, meaning the permanent magnets are located inside the iron core. This ensures that the primary module forms a highly integrated structure without the need for external mechanical fastening measures. Each motor primary module contains six permanent magnet segments, distributed in a double U-shape around the armature coil, resulting in better magnetization and flexible usage. Permanent magnets with low magnetic energy product or those without rare earth materials can be selected. Based on a single motor module, a symmetrical multiphase structure with longitudinal or transverse magnetic flux can be designed as needed to form a multiphase motor structure. Attached Figure Description

[0023] The accompanying drawings, which form part of this embodiment, are used to provide a further understanding of this embodiment. The illustrative embodiments and their descriptions are used to explain this embodiment and do not constitute an improper limitation of this embodiment.

[0024] Figure 1 This is a three-dimensional structural diagram of a single module of the dual-secondary modular permanent magnet flux switching linear motor in Embodiment 1 of the present invention.

[0025] Figure 2 This is a schematic cross-sectional view of the primary module of the dual-secondary modular permanent magnet flux switching linear motor in Embodiment 1 of the present invention.

[0026] Figure 3 This is a schematic cross-sectional view of the secondary motor of the dual-secondary modular permanent magnet flux switching linear motor in Embodiment 1 of the present invention.

[0027] Figure 4(a) is a schematic diagram of the magnetic field distribution of the primary module of the dual-secondary modular permanent magnet flux switching linear motor in Embodiment 1 of the present invention.

[0028] Figure 4(b) is another schematic diagram of the magnetic field distribution of the primary module of the dual-secondary modular permanent magnet flux switching linear motor in Embodiment 1 of the present invention.

[0029] Figure 5 This is a schematic diagram of the longitudinal magnetic field structure of the dual-secondary modular permanent magnet flux switching linear motor in Embodiment 1 of the present invention.

[0030] Figure 6 This is a schematic diagram of the transverse magnetic field structure of the dual-secondary modular permanent magnet flux switching linear motor in Embodiment 1 of the present invention.

[0031] Among them, 1. Primary module core, 2. First stage, 2-1. First stage tooth, 3. Second stage, 3-1. Second stage tooth, 4. Permanent magnet, 4-1. First permanent magnet, 4-2. Second permanent magnet, 4-3. Third permanent magnet, 4-4. Fourth permanent magnet, 4-5. Fifth permanent magnet, 4-6. Sixth permanent magnet, 5. Armature coil, 6. Primary tooth one, 6-1. First primary tooth, 6-2. Second primary tooth, 6-3. Third primary tooth, 6-4. Fourth primary tooth, 7. Primary tooth two, 7-1. Fifth primary tooth, 7-2. Sixth primary tooth, 7-3. Seventh primary tooth, 7-4. Eighth primary tooth, 8. Narrow magnetic bridge. Detailed Implementation

[0032] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0033] It should be noted that the following detailed descriptions are exemplary and intended to provide further explanation of this application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0034] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0035] In this invention, terms such as "upper," "lower," "left," "right," "front," "back," "vertical," "horizontal," "side," and "bottom" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are used only to facilitate the description of the structural relationships of the various components or elements of this invention and do not specifically refer to any component or element in this invention. They should not be construed as limiting the invention.

[0036] In this invention, terms such as "fixed connection," "connected," and "linked" should be interpreted broadly, indicating a fixed connection, an integral connection, or a detachable connection; a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can determine the specific meaning of these terms in this invention based on the specific circumstances, and they should not be construed as limitations on the invention.

[0037] Where there is no conflict, the embodiments and features in the embodiments of the present invention can be combined with each other.

[0038] Example 1

[0039] Embodiment 1 of the present invention introduces a dual-secondary modular permanent magnet flux switching linear motor.

[0040] In existing permanent magnet flux-switching linear motors, the permanent magnets are placed between two primary iron cores. If a narrow magnetic bridge is used to connect the two primary iron cores, the overall structural strength of the primary iron cores is significantly low. If a wider magnetic bridge is used to connect the two primary iron cores, the excitation magnetic field of the permanent magnets will be severely weakened. In this embodiment, an extremely narrow connecting magnetic bridge is placed inside the primary module iron core, so that the contact surface between the permanent magnets and the iron core is located inside the iron core. This gives each primary module high integrity and structural strength, thereby solving the problem of poor overall integrity of the permanent magnet flux-switching linear motor module.

[0041] In existing permanent magnet flux-switching linear motors, the permanent magnets are all parallel or perpendicular to the plane where the armature coil is located. This embodiment includes permanent magnets that are both parallel and perpendicular to the plane where the armature coil is located, forming a permanent magnet array distributed around the armature coil. This results in a more ideal excitation effect, effectively improving the excitation effect of the permanent magnets and the thrust density of the motor. Furthermore, it allows the use of permanent magnets with low magnetic energy product or without rare earth materials for excitation, ensuring the excitation effect while reducing economic costs.

[0042] Existing permanent magnet flux switching linear motors, when using modular design, lack module versatility. The motor module in this embodiment has high versatility and can be used to construct longitudinal flux or transverse flux modular multiphase motor structures, solving the problem that the same motor module cannot construct different types of multiphase motors. It can always ensure phase symmetry and is more likely to meet different application requirements.

[0043] According to the conventional definition of a linear motor, the motor involved in this embodiment consists of a primary and a secondary, with an air gap between them; the primary and secondary cores of the motor are made of stacked silicon steel sheets.

[0044] For ease of description, it is agreed that the motor is placed in the XYZ three-dimensional coordinate system, with the three coordinate axes of X, Y, and Z perpendicular to each other. The primary and secondary motors are placed along the Z-axis, and the two air gaps of the motor are parallel to the XY plane. If the XZ plane is regarded as the positive view of the motor, then the X-axis direction is usually referred to as the longitudinal direction, the Y-axis direction as the transverse direction, and the Z-axis direction as the normal direction. Based on the positive view, "left" and "right" describe the relative position along the X-axis, "front" and "back" describe the relative position along the Y-axis, and "up" and "down" describe the relative position along the Z-axis.

[0045] like Figure 1 and Figure 2 The illustrated dual-secondary modular permanent magnet flux switching linear motor includes a primary module core 1, a primary stage 2, a primary stage tooth 2-1, a secondary stage 3, a secondary stage tooth 3-1, a permanent magnet 4, a first permanent magnet 4-1, a second permanent magnet 4-2, a third permanent magnet 4-3, a fourth permanent magnet 4-4, a fifth permanent magnet 4-5, a sixth permanent magnet 4-6, an armature coil 5, a primary tooth 1 6, a first primary tooth 6-1, a second primary tooth 6-2, a third primary tooth 6-3, a fourth primary tooth 6-4, a primary tooth 2 7, a fifth primary tooth 7-1, a sixth primary tooth 7-2, a seventh primary tooth 7-3, an eighth primary tooth 7-4, and a narrow magnetic bridge 8.

[0046] In this embodiment, the primary stage of the linear motor adopts a modular design, with each phase containing one or more primary motor modules. Each primary module has the same structure, and the secondary stage of the motor consists only of an iron core.

[0047] like Figure 2 The primary module of the motor shown includes an iron core, a permanent magnet, and an armature coil. The iron core portion near the air gap is the primary tooth. The primary module is symmetrical along its longitudinal midline.

[0048] In this embodiment, the iron core in the primary module of the motor is divided into an H-shaped region and two U-shaped regions by permanent magnets. The H-shaped region is connected to the two U-shaped regions by a narrow magnetic bridge to form a continuous whole. The ends of the H-shaped and U-shaped regions are close to the air gap and form the primary teeth. The width of each primary tooth is the same along the longitudinal direction (i.e., the X direction), which is w. The tooth pitch of adjacent primary teeth is the same, which is τ, and satisfies 0. <w<τ。

[0049] In this embodiment, the primary module of the motor includes six permanent magnets, three of which are positioned between the H-shaped region and the upper U-shaped region of the iron core, and the other three are positioned between the H-shaped region and the lower U-shaped region of the iron core. There are two schemes for the magnetization direction of the permanent magnets: all permanent magnets are magnetized towards the U-shaped region (e.g., ...). Figure 2 As shown in the diagram, the magnetization direction of all permanent magnets points towards the H-shaped region (i.e., the magnetization direction of all permanent magnets is aligned with the H-shaped region). Figure 2 The permanent magnets shown are magnetized in opposite directions.

[0050] The primary module of the motor in this embodiment includes a centralized armature coil, which is wound around the air portion formed inside the upper and lower U-shaped iron core areas as slots.

[0051] like Figure 3 The secondary winding of the motor shown consists only of an iron core, and the two sides of the secondary winding are symmetrical along the midline. The part of the secondary iron core that protrudes and is close to the air gap is called the secondary tooth. All secondary teeth have the same width along the longitudinal direction, which is u. The pitch of adjacent secondary teeth along the longitudinal direction is the same, which is 2τ, and satisfies w≤u≤w+2(τ-w).

[0052] As shown in Figures 4(a) and 4(b), the core of each motor primary module contains eight primary teeth. From left to right at the top, they are the first primary tooth 6-1, the second primary tooth 6-2, the third primary tooth 6-3, and the fourth primary tooth 6-4. From left to right at the bottom, they are the fifth primary tooth 7-1, the sixth primary tooth 7-2, the seventh primary tooth 7-3, and the eighth primary tooth 7-4.

[0053] Because the secondary tooth pitch (2τ) is twice the primary tooth pitch (τ), and the primary module core and the secondary core are symmetrical along the longitudinal bisector, when the centerline of the first primary tooth 6-1 and the third primary tooth 6-3 coincides with the centerline of the first primary tooth 2-1, the centerlines of the fifth primary tooth 7-1 and the seventh primary tooth 7-3 coincide with the centerline of the second primary tooth 3-1. At this time, the magnetic flux generated by the permanent magnet and passing through the armature coil, that is, the mutual inductance flux of the armature coil, reaches its maximum value, as shown in Figure 4(a). These are the beginning and end of the armature coil, respectively. At this time, the winding direction of the armature coil and the magnetic flux passing through the coil satisfy the right-hand screw relationship.

[0054] When the centerlines of the second primary tooth 6-2 and the fourth primary tooth 6-4 coincide with the centerline of the first primary tooth 2-1, the centerlines of the sixth primary tooth 7-2 and the eighth primary tooth 7-4 coincide with the centerline of the second primary tooth 3-1. At this time, the magnetic flux generated by the permanent magnet and passing through the armature coil, that is, the mutual inductance flux of the armature coil, reaches its maximum value, as shown in Figure 4(b). These are the beginning and end of the armature coil, respectively. At this time, the winding direction of the armature coil and the magnetic flux passing through the coil satisfy the right-hand screw relationship.

[0055] Obviously, the armature coils shown in Figure 4(a) and Figure 4(b) have opposite winding directions. Therefore, if the armature coils in Figure 4(a) and Figure 4(b) have the same winding direction, and the mutual inductance flux of the armature coils in Figure 4(a) is defined as the maximum positive value, then the mutual inductance flux of the armature coils in Figure 4(b) is the maximum negative value.

[0056] Therefore, after the beginning and end of the armature winding coil are fixed, as the relative positions of the primary and secondary windings change, the mutual inductance flux of the armature coil will alternate between positive and negative, and the induced electromotive force of the armature coil will alternate between positive and negative, with a period of 2τ. When a current with the same polarity and frequency as the induced electromotive force of the armature coil is passed through the armature coil, an electromagnetic thrust with a constant direction will be generated.

[0057] based on Figure 1 The single motor module shown has two types of multiphase motor construction schemes, respectively using... Figure 5 and Figure 6 Let's take an example to illustrate.

[0058] like Figure 5 As shown, the silicon steel sheets of the primary and secondary cores of the motor are parallel to the XZ plane, that is, the silicon steel sheets are stacked along the Y-axis. Therefore, the magnetic field of the motor is distributed in the XZ plane. The motor moves along the longitudinal direction (i.e., the X-axis direction). Since the magnetic field of the motor is distributed parallel to the longitudinal direction and perpendicular to the transverse direction, it is usually called the longitudinal flux structure. Each primary module is evenly distributed along the longitudinal direction, and the secondary on both sides is connected along the longitudinal direction. The tooth pitch of the adjacent secondary teeth is 2τ.

[0059] If the number of phases of the motor is m, and the number of primary modules in each phase is n, then when the distance h between two adjacent primary modules along the longitudinal direction satisfies equation (1), the induced electromotive force of the armature windings of each phase of the linear motor is symmetrical; that is...

[0060]

[0061] When m = 3, n = 2, and k = 2 in equation (1), then it is: Figure 5 At this point, the motor has a three-phase structure, with the primary winding containing 6 modules, and each phase containing 2 modules. By adjusting the value of parameter k and the polarity in "±", the longitudinal spacing between adjacent primary modules can be adjusted to meet application requirements. To eliminate even-order harmonics in the induced electromotive force (EMF) of each phase winding, n is usually taken as an even number, ensuring that the armature coil EMFs of different modules in the same phase are 180° out of phase. Connecting them in reverse series can eliminate even-order harmonics in the induced EMF. For example... Figure 5 The A-phase primary modules A1 and A2 in the first embodiment shown.

[0062] Each module has an independent and symmetrical magnetic circuit, and the magnetic field distribution plane is parallel to the direction of motion. Therefore, the H-shaped regions of the cores of each primary module can be connected by silicon steel sheets of the same material to form a continuous core structure without changing the symmetry of the magnetic flux linkage of each phase winding. The arrangement of the primary modules can eliminate even-order harmonics in the induced electromotive force of the phase windings. By tilting the secondary teeth, odd-order harmonics in the induced electromotive force of the phase windings and the positioning force of the motor can be significantly suppressed. The motor has high overall rigidity and good sinusoidal induced electromotive force of the windings.

[0063] like Figure 6As shown, the silicon steel sheets of the primary and secondary iron cores of the motor are parallel to the YZ plane, that is, the silicon steel sheets are stacked along the X-axis. Therefore, the magnetic field of the motor is distributed in the YZ plane. The motor moves along the longitudinal direction (i.e., the X-axis direction). Since the magnetic field distribution of the motor is parallel to the transverse direction and perpendicular to the longitudinal direction, it is usually called the transverse magnetic flux structure.

[0064] Each primary module is evenly distributed longitudinally, and the silicon steel sheet stacking thickness of each primary module core is the same, which is g. The secondary core contains two types of modules that are staggered laterally. The two types of modules are arranged alternately longitudinally, and the silicon steel sheet stacking thickness of each secondary module is the same, which is g. The secondary tooth centerlines of both types of secondary modules coincide with the primary tooth centerlines, but the lateral misalignment distance of the secondary tooth centerlines of the two types of secondary modules is τ.

[0065] If the number of phases of the motor is m, and the number of primary modules in each phase is n, when the distance h between two adjacent primary modules along the longitudinal direction satisfies equation (2), the armature winding flux linkages of each phase of the linear motor in Example 2 are symmetrical, that is...

[0066]

[0067] When m = 3, n = 2, and k = 2 in equation (2), then it is: Figure 6 In this configuration, the motor has a three-phase structure, with the primary phase containing 6 modules, and each phase containing 2 modules. By adjusting the value of parameter k, the longitudinal spacing between adjacent primary modules can be adjusted to meet the requirements of the application scenario. When this structural type is adopted, the induced electromotive force of a single module armature coil does not contain even-order harmonics, so n can be arbitrarily taken as an odd or even number.

[0068] For any relative position, the magnetic reluctance of the permanent magnet circuit remains constant, so the motor has no significant positioning force; the primary modules are flexibly distributed, and by further adjusting the spacing between different primary modules in the same phase, a distributed primary structure can be formed, which effectively weakens the high-order harmonics of the induced electromotive force of the phase winding; the silicon steel sheet of the primary core has a small area, which is easy to process and manufacture, and the motor structure is compact, making it more suitable for vertical long-stroke drive fields.

[0069] In this embodiment, the permanent magnet in each motor primary module is placed between one H-shaped region and two U-shaped regions of the iron core, that is, the permanent magnet is placed inside the iron core. This ensures that the primary module forms a highly integrated structure without the need for external mechanical fastening measures. Each motor primary module contains 6 permanent magnet segments, which are distributed in a double U-shape around the armature coil, resulting in better magnetization and flexible usage. Permanent magnets with low magnetic energy product or those without rare earth materials can be selected. Based on a single motor module, a symmetrical multiphase structure with longitudinal or transverse magnetic flux can be designed as needed to form a multiphase motor structure.

[0070] Example 2

[0071] Embodiment 2 of the present invention introduces a manufacturing method for a dual-secondary modular permanent magnet flux switching linear motor as described in Embodiment 1.

[0072] A method for manufacturing a dual-secondary modular permanent magnet flux-switching linear motor includes:

[0073] By placing the permanent magnets in the primary module of the motor between the H-shaped and U-shaped regions of the iron core, an integrated structure of the primary module of the motor can be formed without the need for external mechanical fastening measures. The permanent magnets in the primary module of the motor are distributed in a double U-shape around the armature coil.

[0074] By designing a single primary motor module into a symmetrical multiphase structure with longitudinal or transverse magnetic flux as needed, a dual-secondary modular permanent magnet flux switching linear motor can be manufactured.

[0075] The above description is merely a preferred embodiment of this practice and is not intended to limit the scope of this practice. Various modifications and variations can be made to this practice by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this practice should be included within the protection scope of this practice.

Claims

1. A dual-secondary modular permanent magnet flux-switching linear motor, characterized in that, The device includes a primary motor and a secondary motor, with an air gap structure between the primary and secondary motors. The primary motor includes at least one identical primary motor module. Each primary motor module includes an iron core, a permanent magnet, and an armature coil. The permanent magnet is located inside the iron core and is distributed in a double U-shape around the armature coil. The secondary motor adopts an axisymmetric double-sided secondary structure composed of an iron core. The primary module of the motor is divided into an H-shaped region and two U-shaped regions by a permanent magnet. The H-shaped region is connected to the two U-shaped regions through a narrow magnetic bridge to form a continuous whole. The primary module of the motor includes six segments of permanent magnets arranged in a segmented manner. Each segment of permanent magnet is located between the H-shaped region and the U-shaped region of the core of the primary module of the motor. The magnetization direction of the permanent magnets is directed towards either the U-shaped region or the H-shaped region. The armature coil is a centralized armature coil, and the air portion formed on the inside of the upper and lower U-shaped areas is used as a slot for winding the armature coil.

2. The dual-secondary modular permanent magnet flux switching linear motor as described in claim 1, characterized in that, Both the primary core and the secondary core of the motor are made of stacked silicon steel sheets.

3. The dual-secondary modular permanent magnet flux switching linear motor as described in claim 1, characterized in that, The iron core near the air gap structure in the primary module of the motor is the primary tooth; the primary module of the motor has an axisymmetric structure.

4. A dual-secondary modular permanent magnet flux switching linear motor as described in claim 3, characterized in that, The width of the primary teeth along the axis of symmetry of the primary module of the motor is consistent, the tooth pitch of adjacent primary teeth is consistent, and the width of the primary teeth is smaller than the tooth pitch of adjacent primary teeth.

5. A dual-secondary modular permanent magnet flux switching linear motor as described in claim 4, characterized in that, The portion of the iron core in the secondary winding of the motor that protrudes from the air gap structure is the secondary tooth.

6. A dual-secondary modular permanent magnet flux switching linear motor as described in claim 5, characterized in that, The widths of the secondary teeth along the direction of the secondary axis of symmetry of the motor are equal, and the pitches of adjacent secondary teeth along the direction of the secondary axis of symmetry of the motor are equal.

7. A method for manufacturing a dual-secondary modular permanent magnet flux-switching linear motor as described in any one of claims 1-6, characterized in that, include: By placing the permanent magnets in the primary module of the motor between the H-shaped and U-shaped regions of the iron core, an integrated structure of the primary module of the motor can be formed without the need for external mechanical fastening measures. The permanent magnets in the primary module of the motor are distributed in a double U-shape around the armature coil. By designing a single primary motor module into a symmetrical multiphase structure with longitudinal or transverse magnetic flux as needed, a dual-secondary modular permanent magnet flux switching linear motor can be manufactured.

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