A coreless permanent magnet synchronous linear motor with double-slot shared winding structure

Abstract

The utility model provides a kind of double-slot shared winding structure's no iron core permanent magnet synchronous linear motor, belong to linear motor technical field, including stator assembly and mover assembly, the stator assembly includes the double-slot of "mountain" shape structure, the double-slot is fixedly installed with permanent magnet pair for providing constant magnetic field in all;The mover assembly includes cooperatively installed upper baffle assembly and lower baffle assembly, sharing winding and symmetrical winding are equipped between the upper baffle assembly and lower baffle assembly, the sharing winding is surrounded lower baffle assembly with half-enclosing structure, and the two sides of sharing winding are located in different slot of double-slot respectively.This scheme improves the space utilization of motor inside, by the setting of sharing winding and symmetrical winding, make magnetic field distribution more uniform, overcome the technical problem of uneven magnetic field distribution of overlapping no iron core linear motor, and then inhibit the thrust fluctuation problem caused by uneven magnetic field distribution.

Description

Technical Field

[0001] This utility model relates to the field of linear motor technology, specifically to a coreless permanent magnet synchronous linear motor with a dual-slot shared winding structure. Background Technology

[0002] A permanent magnet synchronous linear motor is a type of motor that directly converts electrical energy into linear motion mechanical energy. It can achieve direct drive, eliminating problems such as backlash and elastic deformation in intermediate transmission links. It can precisely control the position and speed of the mover, with high positioning accuracy. It is suitable for equipment that requires high-precision positioning, such as semiconductor manufacturing equipment and electronic manufacturing equipment.

[0003] Currently, coreless permanent magnet synchronous linear motors are commonly used in precision motion platforms. Coreless permanent magnet synchronous linear motors are further divided into winding overlap linear motors and winding non-overlap linear motors. Among them, the overlap linear motor can stack more windings and provide a higher thrust density than the non-overlap linear motor. However, the overlap linear motor has a significant end effect during operation, which leads to uneven magnetic field distribution at the motor end, resulting in additional losses and thrust fluctuations, affecting the smoothness and accuracy of the motor operation. This effect is more prominent in high-speed and high-precision applications. Utility Model Content

[0004] The purpose of this invention is to provide a coreless permanent magnet synchronous linear motor with a dual-slot shared winding structure to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A coreless permanent magnet synchronous linear motor with a dual-slot shared winding structure includes a stator assembly and a mover assembly. The stator assembly has a dual-slot "mountain"-shaped structure, and a pair of permanent magnets for providing a constant magnetic field are fixedly installed in each of the dual slots. The mover assembly includes an upper baffle assembly and a lower baffle assembly that are fitted together. A shared winding and a symmetrical winding are provided between the upper baffle assembly and the lower baffle assembly. The shared winding surrounds the lower baffle assembly in a semi-enclosed structure, and the two sides of the shared winding are located in different slots of the dual slots. The symmetrical winding includes a pair of independent single windings symmetrically arranged in different slots of the dual slots.

[0007] Preferably, the shared winding has one or more sections; the symmetrical winding has one or more sections.

[0008] Preferably, the upper baffle assembly and the lower baffle assembly form a hollow “π” shape that matches their shapes, and the shared winding and the symmetrical winding are fixedly installed inside the hollow structure.

[0009] Preferably, the lower part of the upper baffle assembly is located in different slots of the double groove, and the lower part of the lower baffle assembly is also located in different slots of the double groove.

[0010] Preferably, the hollow structure is provided with a connecting block for fixing the upper baffle assembly and the lower baffle assembly, and the connecting block is also used to limit the shared winding and the symmetrical winding.

[0011] Preferably, the single winding is C-shaped, and the opening of the C-shaped single winding faces horizontally toward the side of the upper baffle assembly.

[0012] Preferably, permanent magnet pairs are symmetrically fixedly installed in both slots of the stator assembly, and the permanent magnet pairs are arranged in an array along the direction of movement of the mover.

[0013] The beneficial effects of the above-mentioned technical solution of this utility model are as follows:

[0014] This solution, through a dual-slot shared winding structure, extends the winding length while simultaneously driving the motor with two sets of permanent magnet arrays. This improves the internal space utilization of the motor, and the longer winding allows for a more uniform magnetic field distribution, overcoming the technical problem of uneven magnetic field distribution in overlapping coreless linear motors. This, in turn, suppresses thrust fluctuations caused by uneven magnetic field distribution. Simultaneously, the shared winding reduces the number of end connections, simplifying the winding and winding process and lowering the manufacturing difficulty and cost of overlapping coreless linear motors.

[0015] The symmetrical windings and shared windings in this design have certain differences in electrical characteristics due to their different lengths, which facilitates fault diagnosis and location in the motor. By monitoring and analyzing parameters such as current and voltage of different windings, the location and type of fault can be determined more accurately, which helps to quickly troubleshoot and repair the fault, reduce downtime, and improve production efficiency. Attached Figure Description

[0016] The above and other objects, features, and advantages of the present invention will become readily understood by reading the following detailed description of exemplary embodiments with reference to the accompanying drawings. In the drawings, several embodiments of the present invention are shown by way of example and not limitation, and like or corresponding reference numerals denote like or corresponding parts, wherein:

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0018] Figure 2 This is a side view of the present invention;

[0019] Figure 3 This is a schematic diagram of the hollow structure of this utility model;

[0020] Figure 4 This is a schematic diagram of the internal structure of this utility model;

[0021] Figure 5 This is a schematic diagram of a shared winding and a symmetrical winding topology.

[0022] Explanation of reference numerals in the attached figures:

[0023] 1. Stator assembly; 11. Double slot; 12. Permanent magnet pair; 2. Mover assembly; 21. Upper baffle assembly; 22. Lower baffle assembly; 23. Hollow structure; 24. Shared winding; 25. Symmetrical winding; 26. Connecting block; 27. Screw. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Those skilled in the art should understand that the embodiments described below are only some, not all, of the embodiments disclosed. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0025] When current flows through the shared winding 24 and the symmetrical winding 25, according to Ampere's law, the current will generate a magnetic field around them. For each winding, a ring-shaped magnetic field will be formed around it when the current flows through it. The magnetic fields generated by the shared winding 24 and the symmetrical winding 25 interact with the magnetic field of the permanent magnet to produce an electromagnetic force. This electromagnetic force will push the mover assembly 2, thereby driving the mover assembly 2 to move.

[0026] In this design, the mover assembly 2 is simultaneously subjected to the electromagnetic forces of two permanent magnet arrays, the symmetrical winding 25, and the shared winding 24, thereby achieving greater thrust. Furthermore, compared to the drastic changes in magnetomotive force within and between slots caused by the concentrated arrangement of windings in a single slot in traditional designs, the shared winding 24 utilizes a longer winding length and is placed between the two permanent magnet arrays (dual-slot 11). This results in a smoother magnetomotive force distribution in the shared winding 24, reducing abrupt changes in magnetomotive force and thus making the magnetic field distribution more uniform. With a more uniform magnetic field distribution, the harmonic components of the magnetic field decrease, and the degree of magnetic field distortion is reduced, which helps improve the smoothness of motor operation, reduce vibration and noise, and thus reduce thrust fluctuations.

[0027] The symmetrical winding 25 is located in a single slot and is used to compensate for the insufficient magnetic field strength distribution caused by the length of the shared winding 24. The magnetic field generated by the single winding is relatively concentrated and uniform, resulting in a certain degree of non-uniformity in the magnetic field distribution. The shared winding 24 can average out the magnetic field distribution to a certain extent. When the shared winding 24 and the single winding work together, the single winding is responsible for ensuring the basic magnetic field strength, while the shared winding 24 is responsible for filling some weak areas in the magnetic field distribution of the single winding, making the magnetic field of the entire motor more uniform in space. For example, at the end of the motor, the magnetic field acting on the single winding in a single slot will exhibit an edge effect, leading to a weakening of the magnetic field strength. The shared winding 24, through a uniform magnetic field distribution, makes the magnetic field at the end more consistent with the magnetic field in the middle part, reducing local distortion of the magnetic field.

[0028] After introducing the basic principles of this utility model, various non-limiting embodiments of this utility model are described in detail below. Any quantity of elements in the accompanying drawings is for illustrative purposes only and not for limitation, and any naming is for distinction only and has no limiting meaning.

[0029] The principles and spirit of this utility model will be explained in detail below with reference to several representative embodiments.

[0030] Example 1

[0031] A coreless permanent magnet synchronous linear motor with a dual-slot shared winding structure, such as Figures 1-5 As shown, it includes a stator assembly 1 and a mover assembly 2. The stator assembly 1 is a "mountain" shaped structure containing double slots 11. Permanent magnet pairs 12 for providing a constant magnetic field are fixedly installed on the two opposite side walls of each slot of the double slots 11. The permanent magnet pairs 12 are arranged in an array along the movement direction of the mover assembly 2.

[0032] like Figures 1-4 As shown, the moving part assembly 2 includes an upper baffle assembly 21 and a lower baffle assembly 22 that are fitted together. The upper baffle assembly 21 and the lower baffle assembly 22 form a "π"-shaped hollow structure 23 that matches their shape. A shared winding 24 and a symmetrical winding 25 are fixedly installed inside the hollow structure 23. A connecting block 26 for fixing the upper baffle assembly 21 and the lower baffle assembly 22 is also fixedly installed inside the hollow structure 23. The upper baffle assembly 21, the lower baffle assembly 22 and the connecting block 26 are fixedly connected on at least one side by screws 27, and the other side can be fixedly connected by screws 27, adhesive, or integral molding. The connecting block 26 is also used to limit the shared winding 24 and the single winding, and a path for winding installation is reserved on it. In this embodiment, the connecting block 26 is a heat dissipation resin block. In other embodiments, the connecting block 26 can also be a heat dissipation fin or a water-cooled heat dissipation structure.

[0033] like Figures 2-4As shown, the overall structure of the mover assembly 2 matches the hollow structure 23, also in a "π" shape, with its lower two sides inserted into two slots of the stator assembly 1. The shared winding 24 forms a semi-enclosed structure surrounding the upper part and sides of the lower baffle assembly 22, with its two sides located in different slots of the double slot 11 of the stator assembly 1. The shared winding 24 is longer and is placed between two sets of permanent magnet arrays, making the magnetomotive force distribution smoother and reducing abrupt changes in magnetomotive force, thus making the magnetic field distribution more uniform. The pair of single windings of the symmetrical winding 25 are symmetrically located in different slots of the double slot 11. The single winding has a "C" shaped structure, with its "C" shaped opening facing horizontally towards one side of the upper baffle assembly 21.

[0034] like Figure 5 As shown, there are one or more shared windings 24 and one or more symmetrical windings 25. Multiple sets of the two can be stacked as needed to form a topology of shared winding 24-symmetrical winding 25. However, this solution is not limited to the topology shown. In other embodiments, multiple shared windings 24 can be arranged and then inserted into the symmetrical winding 25.

[0035] In this embodiment, the shared winding 24 and the symmetrical winding 25 can be connected in series through the leads at the ends or connected in parallel to the positive and negative poles (not shown in the figure) built into the mover through the leads, and then powered by external electrical connection. This technology is a common method in the field and will not be described in detail here.

[0036] The above-described preferred embodiments of the present invention are provided for guidance, but it will be apparent to those skilled in the art that such embodiments are provided merely by way of example. Many modifications, alterations, and alternatives will arise in the mind and spirit of the present invention without departing from its intent. It should be understood that various alternatives to the embodiments of the present invention described herein may be employed in the practice of the present invention. The appended claims are intended to define the scope of protection of the present invention and therefore cover the modular compositions, equivalents, or alternatives within the scope of these claims.

Claims

1. A coreless permanent magnet synchronous linear motor with a dual-slot shared winding structure, characterized in that, include: The stator assembly (1) and the mover assembly (2) are provided. The stator assembly (1) includes a "mountain" shaped structure with two slots (11). A pair of permanent magnets (12) for providing a constant magnetic field are fixedly installed in each of the two slots (11). The mover assembly (2) includes an upper baffle assembly (21) and a lower baffle assembly (22) that are installed together. A shared winding (24) and a symmetrical winding (25) are provided between the upper baffle assembly (21) and the lower baffle assembly (22). The shared winding (24) surrounds the lower baffle assembly (22) in a semi-enclosed structure. The two sides of the shared winding (24) are located in different slots of the two slots (11). The symmetrical winding (25) includes a pair of independent single windings. The single windings are symmetrically arranged in different slots of the two slots (11).

2. The coreless permanent magnet synchronous linear motor with a dual-slot shared winding structure according to claim 1, characterized in that: The shared winding (24) has one or more; the symmetrical winding (25) has one or more.

3. The coreless permanent magnet synchronous linear motor with a dual-slot shared winding structure according to claim 1, characterized in that: The upper baffle assembly (21) and the lower baffle assembly (22) form a hollow "π" shaped structure (23) that matches their shapes, and the shared winding (24) and the symmetrical winding (25) are fixedly installed inside the hollow structure (23).

4. The coreless permanent magnet synchronous linear motor with a dual-slot shared winding structure according to claim 3, characterized in that: The lower part of the upper baffle assembly (21) is located in different slots of the double groove (11), and the lower part of the lower baffle assembly (22) is also located in different slots of the double groove (11).

5. The coreless permanent magnet synchronous linear motor with a dual-slot shared winding structure according to claim 3, characterized in that: The hollow structure (23) is provided with a connecting block (26) for fixing the upper baffle assembly (21) and the lower baffle assembly (22). The connecting block (26) is also used to limit the shared winding (24) and the symmetrical winding (25).

6. The coreless permanent magnet synchronous linear motor with a dual-slot shared winding structure according to claim 1, characterized in that: The single winding is "C" shaped, and the opening of the "C" of the single winding faces horizontally toward the side of the upper baffle assembly (21).

7. The coreless permanent magnet synchronous linear motor with a dual-slot shared winding structure according to claim 1, characterized in that: The stator assembly (1) has a pair of permanent magnets (12) symmetrically fixedly installed in both slots (11), and the pair of permanent magnets (12) is arranged in an array along the direction of motion of the mover.

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