Magnetic gathering type linear motor

Abstract

The utility model discloses a magnetism gathering type linear motor, comprising a stator comprising a stator yoke portion extending along the X-axis direction and a plurality of stator tooth portions arranged on the stator yoke portion at intervals along the X-axis direction; the mover is arranged opposite to the stator in the Y-axis direction, and the mover comprises a mover yoke part and an iron core monomer connected with the mover yoke part; each single iron core comprises an iron core end part and first permanent magnets and second permanent magnets which are arranged on the iron core end part, the magnetizing directions of the first permanent magnets and the second permanent magnets are not parallel, the first permanent magnets and the second permanent magnets are alternately arranged along the X-axis direction, the number of the first permanent magnets is N, the number of the second permanent magnets is N-1, and N is greater than or equal to 2; the stator tooth part comprises a stator top wall adjacent to the iron core single body and two first stator side walls connected to the two sides of the stator top wall in the X-axis direction, and a chamfer structure is formed between the stator top wall and the first stator side walls. By adopting the structure, the magnetic gathering effect is obvious, and the cogging force of the motor is effectively reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of motors, in particular to a magnetic concentration type linear motor. Background Art

[0002] In a motor, cogging force refers to the force generated by the interaction of the uneven air gap magnetic field between the mover and the stator. When the structural design of the mover or stator is unreasonable, an uneven air gap magnetic field will exist between the mover and the stator, which may cause large thrust fluctuations, cause motor vibration and noise, affect the efficiency of the motor and other adverse effects, and reduce the operating quality of the motor.

[0003] Therefore, it is necessary to improve the prior art to overcome the above defects in the prior art. Utility Model Content

[0004] The utility model aims to provide a magnetic field concentration type linear motor, which has a significant magnetic field concentration effect and effectively reduces the cogging force of the motor.

[0005] The purpose of the utility model is achieved through the following technical solutions: a magnetic concentrating linear motor, comprising:

[0006] The stator comprises a stator yoke extending along the X-axis direction and a plurality of stator teeth arranged on the stator yoke at intervals along the X-axis direction;

[0007] A mover is arranged opposite to the stator in the Y-axis direction, and the mover includes a mover yoke and an iron core monomer connected to the mover yoke;

[0008] The core monomer includes a core end and a first permanent magnet and a second permanent magnet disposed on the core end, the magnetization directions of the first permanent magnet and the second permanent magnet are not parallel, the first permanent magnet and the second permanent magnet are alternately arranged along the X-axis direction, the number of the first permanent magnets is N, the number of the second permanent magnets is N-1, and N≥2;

[0009] The stator teeth include a stator top wall adjacent to the core unit and two first stator side walls connected to both sides of the stator top wall in the X-axis direction, and a chamfered structure is formed between the stator top wall and the first stator side walls.

[0010] Furthermore, the magnetizing direction of the first permanent magnet is parallel to the X-axis direction, the magnetizing direction of the second permanent magnet is parallel to the Y-axis direction, the magnetizing directions of two adjacent first permanent magnets are opposite, and the magnetizing directions of two adjacent second permanent magnets are opposite.

[0011] Furthermore, the movable yoke extends along the X-axis direction, and a plurality of the iron core monomers are arranged at intervals along the X-axis direction and are connected in series with each other.

[0012] Furthermore, the core monomer includes a core tooth portion connected between the core end portion and the movable yoke portion and a winding wound on the core tooth portion, and the winding is limited between the movable yoke portion and the core end portion.

[0013] Furthermore, a plurality of mounting grooves are provided on the end of the iron core, and the first permanent magnet and the second permanent magnet are embedded and fixed in different mounting grooves.

[0014] Furthermore, the first permanent magnet and the second permanent magnet are evenly distributed at the end of the core along the X-axis direction.

[0015] Further, the sizes of the first permanent magnet and / or the second permanent magnet are the same or different.

[0016] Furthermore, a second stator side wall is connected between the stator top wall and the first stator side wall to form the chamfered structure, and the second stator side wall is a straight surface or an arc surface.

[0017] Furthermore, the stator top wall is perpendicular to the Y-axis direction, and the first stator side wall is inclined to the X-axis direction and / or the Y-axis direction.

[0018] Compared with the prior art, the utility model has the following beneficial effects: the utility model arranges a plurality of stator teeth at intervals on the stator yoke, and the stator teeth can modulate the magnetic field on the mover, thereby generating an alternating magnetic field in the mover to generate thrust when current is passed through the mover. Compared with the traditional motor, the utility model has a reasonable structural design, does not need to place permanent magnets on the stator, has low cost, simple installation, long motor life, small electromagnetic interference, small safety hazards, and is easy to promote and use; the end of the iron core is provided with a first permanent magnet and a second permanent magnet which are alternately arranged along the X-axis direction and have non-parallel magnetizing directions. , the number of the first permanent magnets is N, the number of the second permanent magnets is N, N≥2, by adopting the first permanent magnet and the second permanent magnet arranged as above, the permanent magnet magnetic field concentration effect is significant, thereby obtaining a higher permanent magnetic field utilization rate and a smaller leakage coefficient, thereby significantly increasing the thrust density, reducing the motor cogging force, the motor thrust fluctuation is small, and the motor operation stability is effectively improved; by arranging a chamfered structure on the stator teeth, the change of the magnetic resistance of the magnetic circuit along the movement direction is smoother and closer to a sine wave, thereby reducing the cogging force and alleviating the frustration of the motor during operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of the magnetic concentrating linear motor of the utility model.

[0020] Figure 2 It is a structural schematic diagram of the utility model when the mover is provided with a plurality of iron core monomers.

[0021] Figure 3 It is a schematic diagram of the arrangement of a permanent magnet in an embodiment of the present utility model.

[0022] Figure 4 It is a schematic diagram of the arrangement of another embodiment of the permanent magnet in the utility model.

[0023] Description of reference numerals:

[0024] 100, stator; 110, stator yoke; 120, stator teeth; 121, stator top wall; 122, first stator side wall; 123, second stator side wall; 200, mover; 210, mover yoke; 220, core unit; 221, core end; 222, first permanent magnet; 223, second permanent magnet; 224, core teeth; 225, winding. DETAILED DESCRIPTION

[0025] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. It is to be understood that the specific embodiments described herein are only used to explain the present application, rather than to limit the present application. It should also be noted that, for ease of description, only some structures related to the present application are shown in the accompanying drawings, rather than all structures. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0026] The terms "including" and "having" and any variations thereof in this application are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device comprising a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to these processes, methods, products or devices.

[0027] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0028] See also Figures 1 to 4As shown, a magnetic concentrating linear motor corresponding to a preferred embodiment of the utility model includes: a stator 100, including a stator yoke 110 extending along the X-axis direction and a plurality of stator teeth 120 arranged on the stator yoke 110 at intervals along the X-axis direction; a mover 200, arranged opposite to the stator 100 in the Y-axis direction, the mover 200 includes a mover yoke 210 and a core monomer 220 connected to the mover yoke 210; wherein the core monomer 220 includes a core end 221 and a first permanent magnet 222 and a second permanent magnet 223 arranged on the core end 221, the magnetizing directions of the first permanent magnet 222 and the second permanent magnet 223 are not parallel, the first permanent magnet 222 and the second permanent magnet 223 are alternately arranged along the X-axis direction, the number of the first permanent magnet 222 is N, the number of the second permanent magnet 223 is N-1, and N≥2.

[0029] The utility model arranges a plurality of stator teeth 120 at intervals on the stator yoke 110, and the stator teeth 120 can modulate the magnetic field on the mover 200, thereby generating an alternating magnetic field in the mover 200, so as to generate thrust when current is passed through the mover 200. Compared with the traditional motor, the utility model has a reasonable structural design, does not need to place permanent magnets on the stator 100, has low cost, simple installation, long motor life, small electromagnetic interference, small safety hazards, and is easy to promote and use; the core end 221 is provided with an alternating magnetic field along the X-axis direction. The first permanent magnet 222 and the second permanent magnet 223 are arranged with non-parallel magnetizing directions, the number of the first permanent magnet 222 is N, the number of the second permanent magnet 223 is N-1, and N≥2. By adopting the first permanent magnet 222 and the second permanent magnet 223 arranged as above, the permanent magnet magnetic field concentration effect is significant, thereby obtaining a higher permanent magnetic field utilization rate and a smaller leakage magnetic coefficient, thereby significantly increasing the thrust density, reducing the motor cogging force, and reducing the motor thrust fluctuation, thereby effectively improving the motor operation stability.

[0030] Furthermore, the magnetization direction of the first permanent magnet 222 is parallel to the X-axis direction, the magnetization direction of the second permanent magnet 223 is parallel to the Y-axis direction, the magnetization directions of two adjacent first permanent magnets 222 are opposite, and the magnetization directions of two adjacent second permanent magnets 223 are opposite. With the above structure, the first permanent magnet 222 and the second permanent magnet 223 can be closely attached to each other in the X-axis direction, so that the magnetic concentration effect is stronger and the magnetic field is stronger.

[0031] Furthermore, the mover yoke 210 and the core monomer 220 are both made of soft magnetic materials, such as silicon steel sheets, soft magnetic ferrites, amorphous alloys, etc. The mover yoke 210 extends along the X-axis direction, and a plurality of core monomers 220 are arranged at intervals along the X-axis direction and connected in series to increase the thrust of the motor.

[0032] The core monomer 220 includes a core tooth portion 224 connected between the core end portion 221 and the mover yoke portion 210 and a winding 225 wound on the core tooth portion 224. The winding 225 is a copper core enameled wire, and the winding 225 is limited between the mover yoke portion 210 and the core end portion 221. The spacing distance between two adjacent core tooth portions 224 is a fixed value or a non-fixed value. When the spacing distance between two adjacent core tooth portions 224 is a fixed value, it can be convenient for production and processing; when the spacing distance between two adjacent core tooth portions 224 is a non-fixed value, it can adjust the air gap magnetic field, suppress the cogging force, and make the output thrust larger and the thrust fluctuation smaller.

[0033] The first permanent magnet 222 and the second permanent magnet 223 are made of permanent magnetic material, and a plurality of mounting grooves (not shown) are provided on the core end 221. The first permanent magnet 222 and the second permanent magnet 223 are embedded and fixed in different mounting grooves. The permanent magnet can be fixed in the mounting groove by gluing, or directly embedded in the mounting groove by using its suction force and then fixed in the mounting groove by potting.

[0034] In this embodiment, the first permanent magnet 222 and the second permanent magnet 223 are evenly distributed on the core end 221 along the X-axis direction to further improve the stability of the motor operation. The size of the first permanent magnet 222 and / or the second permanent magnet 223 is the same or different, which is not limited by the present invention.

[0035] Preferably, the bottom surfaces of the first permanent magnet 222 and the second permanent magnet 223 in the Y-axis direction are flush, and the top surface of the first permanent magnet 222 in the Y-axis direction is not higher than the top surface of the second permanent magnet 223, so that the magnetization directions of the first permanent magnet 222 and the second permanent magnet 223 intersect in the second permanent magnet 223. By adopting the above structure, the air gap flux density of the motor can be improved and the magnetic leakage at the core end 221 can be reduced to improve the thrust density, acceleration performance and load performance. In addition, by increasing or decreasing the number of the first permanent magnet 222 and the second permanent magnet 223, the magnetic circuit can be changed, thereby changing the motor performance.

[0036] Furthermore, the stator tooth portion 120 includes a stator top wall 121 adjacent to the core end 221 of the core unit 220 and two first stator side walls 122 connected to the stator top wall 121 on both sides of the X-axis direction. One side of the first stator side wall 122 is connected to the stator yoke 110, and a chamfered structure is formed between the other side and the first stator side wall 122, so that the change of the magnetic resistance of the magnetic circuit along the movement direction is smoother and closer to a sine wave, thereby reducing the cogging force and alleviating the sense of frustration of the motor during operation.

[0037] Furthermore, the stator yoke 110 and the stator teeth 120 are both made of soft magnetic materials, such as silicon steel sheets, soft magnetic ferrites, amorphous alloys, etc. The stator teeth 120 extend from one side to the other side of the stator yoke 110 along the width direction of the stator yoke 110, the width direction of the stator yoke 110 is perpendicular to the X-axis and Y-axis directions, and the extension direction of the stator teeth 120 can be perpendicular or inclined to the X-axis direction.

[0038] In this embodiment, the stator teeth 120 are trapezoidal teeth to reduce the cogging force of the motor. The stator top wall 121 is perpendicular to the Y-axis direction, and the first stator side wall 122 is inclined to the X-axis and / or Y-axis direction to further reduce the cogging force. The second stator side wall 123 is connected between the stator top wall 121 and the first stator side wall 122 to form a chamfered structure, and the second stator side wall 123 is a straight surface or an arc surface.

[0039] Preferably, the number of the second stator side walls 123 of each stator tooth portion 120 is two, and they are located on both sides of the stator top wall 121 in the X-axis direction, so that the thrust fluctuation can be reduced by the chamfered structure when the mover 200 reciprocates along the X-axis direction. Of course, in other embodiments, the stator tooth portion 120 can also be a rectangular tooth. When the second stator side wall 123 is a flat surface, it is inclined to the X-axis direction and / or the Y-axis direction, and the angle between the stator top wall 121 and the second stator side wall 123 is preferably equal to the angle between the first stator side wall 122 and the second stator side wall 123.

[0040] The utility model adopts a stator 100 provided with a chamfered structure, and cooperates with the mover 200 of the aforementioned specific structure, which can utilize the magnetic field concentration effect to obtain the magnetic induction intensity with the maximum effective value. The stator tooth portion 210 is designed with a chamfered structure, which can modulate the air gap magnetic resistance of the motor, and then adjust the air gap magnetic field to a sine wave, so as to simultaneously obtain the maximum magnetic field operating point and the minimum tooth slot torque, thereby improving the motor performance.

[0041] The above description is only an implementation method of the present application, and does not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the description and drawings of this application, or directly or indirectly used in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A magnetic concentrating linear motor, characterized in that: include: A stator (100) comprises a stator yoke (110) extending along an X-axis direction and a plurality of stator teeth (120) arranged on the stator yoke (110) at intervals along the X-axis direction; A mover (200) is arranged opposite to the stator (100) in the Y-axis direction, and the mover (200) comprises a mover yoke (210) and an iron core monomer (220) connected to the mover yoke (210); The iron core monomer (220) comprises an iron core end (221) and a first permanent magnet (222) and a second permanent magnet (223) arranged on the iron core end (221); the magnetization directions of the first permanent magnet (222) and the second permanent magnet (223) are not parallel; the first permanent magnet (222) and the second permanent magnet (223) are alternately arranged along the X-axis direction; the number of the first permanent magnets (222) is N, the number of the second permanent magnets (223) is N-1, and N≥2; The stator tooth portion (120) comprises a stator top wall (121) adjacent to the iron core monomer (220) and two first stator side walls (122) connected to the stator top wall (121) on both sides in the X-axis direction, and a chamfered structure is formed between the stator top wall (121) and the first stator side walls (122).

2. The magnetic concentrating linear motor according to claim 1, characterized in that: The magnetization direction of the first permanent magnet (222) is parallel to the X-axis direction, the magnetization direction of the second permanent magnet (223) is parallel to the Y-axis direction, the magnetization directions of two adjacent first permanent magnets (222) are opposite, and the magnetization directions of two adjacent second permanent magnets (223) are opposite.

3. The magnetic concentrating linear motor according to claim 1, characterized in that: The movable yoke (210) extends along the X-axis direction, and a plurality of the iron core monomers (220) are arranged at intervals along the X-axis direction and are connected in series with each other.

4. The magnetic concentrating linear motor according to claim 1, characterized in that: The iron core monomer (220) comprises an iron core tooth portion (224) connected between the iron core end portion (221) and the movable yoke portion (210), and a winding (225) wound around the iron core tooth portion (224); the winding (225) is limited between the movable yoke portion (210) and the iron core end portion (221).

5. The magnetic concentrating linear motor according to claim 4, characterized in that: A plurality of installation slots are provided on the core end (221), and the first permanent magnet (222) and the second permanent magnet (223) are embedded and fixed in different installation slots.

6. The magnetic concentrating linear motor according to claim 1, characterized in that: The first permanent magnet (222) and the second permanent magnet (223) are evenly distributed at the core end (221) along the X-axis direction.

7. The magnetic concentrating linear motor according to claim 1, characterized in that: The sizes of the first permanent magnet (222) and / or the second permanent magnet (223) are the same or different.

8. The magnetic concentrating linear motor according to claim 1, characterized in that: A second stator side wall (123) is connected between the stator top wall (121) and the first stator side wall (122) to form the chamfered structure, and the second stator side wall (123) is a straight surface or an arc surface.

9. The magnetic concentrating linear motor according to claim 8, characterized in that: The stator top wall (121) is perpendicular to the Y-axis direction, and the first stator side wall (122) is inclined to the X-axis direction and / or the Y-axis direction.

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