Primary winding arrangement structure, primary winding and linear induction motor

Abstract

The embodiment of the invention provides a primary winding arrangement structure, a primary winding and a linear induction motor, the primary winding arrangement structure is applied to the linear induction motor and comprises a first part and two second parts, the first part comprises a plurality of first coils, the plurality of first coils are sequentially arranged along a first direction, and the two second parts are arranged along a second direction. The number of winding turns of each first coil is a; the two second parts are arranged at the two ends of the first part in the first direction respectively, each second part comprises a plurality of second coils, the second coils are sequentially arranged in the first direction, and the number of winding turns of each second coil is b; a and b are natural numbers greater than 0, and a is less than b. According to the primary winding arrangement structure, the primary winding and the linear induction motor provided by the embodiment of the invention, the end effect of the linear induction motor is improved, and the traction force loss of the end part of the linear induction motor is reduced.

Description

Technical Field

[0001] The present application belongs to the field of motor technology, and specifically relates to a primary winding arrangement structure, a primary and a linear induction motor. Background Art

[0002] A linear induction motor is an induction motor that directly converts electrical energy input into linear motion. Due to the special structure of a linear induction motor, its stator is usually called the primary and the rotor is usually called the secondary. Because it can directly convert electrical energy into mechanical energy for linear motion without the need for any intermediate conversion mechanism, the linear induction motor has a higher efficiency in converting electrical energy into mechanical energy. It has been widely used in urban rail transit to provide basic guarantees for citizens' lives and plays an important role in promoting urban vitality and regional development, expanding urban functions, etc.

[0003] Rail vehicles that use linear traction motors as power systems have the characteristics of small turning radius, strong climbing ability, and low engineering cost. Their application has enriched the types of urban rail transit, and combined with the rotary motor traction system, urban rail transit networking has become more flexible and changeable. However, in the related linear induction motors, an inevitable problem is that due to the particularity of the linear motor structure, it will be affected by the edge effect when running at high speed. The edge effect will weaken the magnetic field strength at the end of the motor, thereby reducing the motor thrust. Therefore, suppressing the edge effect helps to improve the performance of the motor.

[0004] Therefore, how to improve the edge effect of linear induction motors has become an urgent problem to be solved in the industry. Summary of the invention

[0005] The technical problem to be solved by the present application is to provide a primary winding arrangement structure, a primary and a linear induction motor which can improve the edge effect and reduce the traction loss at the end.

[0006] In a first aspect, an embodiment of the present application provides a primary winding arrangement structure, which is applied to a linear induction motor, comprising a first part and two second parts, wherein the first part comprises a plurality of first coils, which are arranged in sequence along a first direction, and the number of winding turns of each first coil is a; the two second parts are respectively arranged at both ends of the first part along the first direction, and the second part comprises a plurality of second coils, which are arranged in sequence along the first direction, and the number of winding turns of each second coil is b; a and b are both natural numbers greater than 0, and a<b.

[0007] According to an embodiment of the first aspect of the present application, the primary winding arrangement structure includes a multi-phase winding, and at least a portion of the coil of at least one phase in the multi-phase winding is a second coil.

[0008] According to an embodiment of the first aspect of the present application, a multi-phase winding includes a first phase sub-winding, a second phase sub-winding and a third phase sub-winding, and the first phase sub-winding, the second phase sub-winding and the third phase sub-winding are alternately arranged in sequence along a first direction, and some coils of the first phase sub-winding, the second phase sub-winding and the third phase sub-winding are second coils.

[0009] In the second aspect, an embodiment of the present application provides a primary, including an iron core and a primary winding arrangement structure as provided in any embodiment of the first aspect of the present application, the iron core includes a yoke and a plurality of teeth, the yoke is arranged along a first direction, the plurality of teeth are arranged on one side of the yoke along the first direction, and the plurality of teeth are arranged in sequence along the first direction; each first coil is wound between two teeth, and each second coil is wound between two teeth.

[0010] According to an embodiment of the second aspect of the present application, the plurality of teeth are arranged along a second direction, and the second direction intersects with the first direction and is not perpendicular to the first direction.

[0011] According to an embodiment of the second aspect of the present application, in a cross section of the primary winding arrangement structure perpendicular to the third direction, the shape of the multiple conductors in each first coil is a parallelogram, and the shape of the multiple conductors in each second coil is a parallelogram.

[0012] According to an embodiment of the second aspect of the present application, winding slots for accommodating the first coil and / or the second coil are formed between adjacent teeth; the ratio of the size of the positive projection of each tooth onto the yoke in the first direction to the size of the winding slot in the first direction is 0.3 to 0.8.

[0013] According to an embodiment of the second aspect of the present application, a ratio of a size of an orthographic projection of each tooth portion onto the yoke portion in the first direction to a size of the winding slot in the first direction is 0.5.

[0014] According to an embodiment of the second aspect of the present application, each first coil is wound between eight teeth, and each second coil is wound between eight teeth.

[0015] In a third aspect, an embodiment of the present application provides a linear induction motor, comprising a primary as provided in any embodiment of the second aspect of the present application.

[0016] The beneficial effect of the present application is that by setting the value of the winding turns a of the first part to be smaller than the value of the winding turns b of the second part to change the arrangement structure of the winding, by winding more turns at the end of the primary winding so that the end of the primary winding has more coil conductors, the magnetic induction intensity at both ends of the primary is increased, thereby alleviating the edge effect of the linear induction motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 It is a primary three-dimensional structural schematic diagram provided by an embodiment of the second aspect of the present application;

[0019] Figure 2 It is a primary structural diagram provided by an embodiment of the second aspect of the present application;

[0020] Figure 3 yes Figure 2 An enlarged view of section A of the primary is shown;

[0021] Figure 4 is a schematic diagram of the primary winding arrangement structure provided in the first aspect of the present application;

[0022] Figure 5 It is a comparison diagram of the air gap magnetic density at each position of the primary winding arrangement structure (non-uniform distribution) provided in the first aspect of the present application and the uniform distribution arrangement in the related art.

[0023] In the figure, 1000, primary; 200, iron core; 201, yoke; 202, tooth; 100, primary winding arrangement structure; 101, first part; 1011, first coil; 102, second part; 1021, second coil; 10, multi-phase winding; 11, first phase sub-winding; 12, second phase sub-winding; 13, third phase sub-winding;

[0024] X, first direction; Y, second direction; Z, third direction. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0026] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as those commonly understood by technicians in the technical field of this application; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned drawings and any variations thereof are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary and secondary relationship.

[0027] Reference to "embodiments" in this application 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 in this application may be combined with other embodiments.

[0028] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "attached" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0029] The term "and / or" in this application is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this application generally indicates that the associated objects before and after are in an "or" relationship.

[0030] The term "multiple" as used in this application refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple sheets" refers to more than two sheets (including two sheets).

[0031] The primary winding arrangement structure 100 provided in the present application can be applied to a multi-phase AC linear induction motor. In the embodiments of the present application, the primary winding arrangement structure 100 is applied to a three-phase AC linear induction motor for illustration.

[0032] Figure 1 It is a primary three-dimensional structural schematic diagram provided by an embodiment of the second aspect of the present application; Figure 2 It is a primary structural diagram provided by an embodiment of the second aspect of the present application; Figure 3 yes Figure 2 An enlarged view of section A of the primary is shown; Figure 4 is a schematic diagram of the primary winding arrangement structure provided in the first aspect of the present application; Figure 5 It is a comparison diagram of the air gap magnetic density at each position of the primary winding arrangement structure (non-uniform distribution) provided in the first aspect of the present application and the uniform distribution arrangement in the related art.

[0033] like Figures 1 to 5 As shown, an embodiment of the present application provides a primary winding arrangement structure 100, which is applied to a linear induction motor, and includes a first part 101 and two second parts 102, wherein the first part 101 includes a plurality of first coils 1011, the plurality of first coils 1011 are arranged in sequence along a first direction X, and the number of winding turns of each first coil 1011 is a; the two second parts 102 are respectively arranged at both ends of the first part 101 along the first direction X, the second part 102 includes a plurality of second coils 1021, the plurality of second coils 1021 are arranged in sequence along the first direction X, and the number of winding turns of each second coil 1021 is b; a and b are both natural numbers greater than 0, and a<b.

[0034] The primary winding arrangement structure 100 refers to the arrangement structure of the primary winding in the linear induction motor, and its structure is mainly reflected in the distribution of the winding on the primary iron core. Compared with the uniformly distributed winding method used in the prior art, in these embodiments of the present application, by changing the winding method of the primary winding arrangement structure 100, that is, adopting a non-uniformly distributed coil design, more coils are arranged at both ends of the primary iron core to enhance the magnetic field strength of the primary at the end, alleviate the influence of the edge effect on the linear induction motor, and improve the overall thrust of the motor.

[0035] The primary winding arrangement structure 100 includes a first portion 101 and two second portions 102 , which means that in the primary of the linear induction motor, the winding is divided into three portions along the setting direction of the primary iron core, namely, a first portion 101 and two second portions 102 .

[0036] The difference between the first part 101 and the two second parts 102 is that the first part 101 includes a plurality of first coils 1011, and the number of winding turns of each first coil 1011 is a; the second part 102 includes a plurality of second coils 1021, and the number of winding turns of each second coil 1021 is b. In other words, the difference between the first part 101 and the second part 102 is the number of winding turns of the coils of each part. When the number of winding turns of a coil is a, the coil belongs to the first part 101, and when the number of winding turns of a coil is b, the coil belongs to the second part 102.

[0037] Based on this, in the embodiments of the present application, it can be determined whether the coil belongs to the first part 101 or the second part 102 by the number of winding turns of the coil.

[0038] The first part 101 includes a plurality of first coils 1011, which means that a plurality of first coils 1011 can be arranged in a region of the entire primary winding corresponding to the first part 101 along the first direction X. Correspondingly, the second part 102 includes a plurality of second coils 1021, which means that a plurality of second coils 1021 can be arranged in a region of the entire primary winding corresponding to the second part 102 along the first direction.

[0039] It should be noted that since the coil needs to be wound on the slot walls of the two winding slots of the primary iron core, when the winding is formed, the winding slots located in the middle part of the primary iron core are usually used to wind two different coils, while the winding slots at both ends of the primary iron core are usually only used to wind one coil. In this way, the magnetic induction intensity at both ends of the primary will be reduced due to the reduction in the number of conductors of the coil in the winding slots at the primary end position.

[0040] Based on this, in these embodiments of the present application, by designing the uneven distribution of the first coil 1011 and the second coil 1021, and concentrating the second coil 1021 at both ends of the first coil 1011, the number of coil conductors in the winding slots at both ends of the primary core is increased in the entire winding structure, thereby enhancing the magnetic induction strength at both ends of the primary and alleviating the edge effect of the linear induction motor.

[0041] A plurality of first coils 1011 are arranged in sequence along the first direction X, and a plurality of second coils 1021 are arranged in sequence along the first direction X. A possible implementation method is that, in the winding forming stage, a plurality of coils are arranged in sequence along the first direction X, and a structure in which the middle portion is a double-layer coil and the two end portions are a single-layer coil is formed. During winding, a plurality of coils at the two ends of the plurality of coils along the first direction X are wound more to form a first coil 1011 with more turns, and a plurality of coils at the middle portion of the plurality of coils along the first direction X are wound less to form a second coil 1021 with fewer turns.

[0042] In these embodiments of the present application, multiple first coils 1011 are arranged in sequence along the first direction X, and multiple second coils 1021 are arranged in sequence along the first direction X, which means that when the winding is installed on the primary iron core, each coil (the first coil 1011 or the second coil 1021) needs to be wound between two teeth of the primary iron core, so that each coil is wound on different teeth at one end along the first direction X in sequence.

[0043] Exemplarily, the primary core is arranged along the first direction X, and the primary core includes a first tooth portion, a second tooth portion, a third tooth portion, a fourth tooth portion, a fifth tooth portion, and a sixth tooth portion arranged in sequence along the first direction X. At this time, a second coil 1021 can be arranged to be wound between the first tooth portion and the second tooth portion, another second coil 1021 can be arranged to be wound between the second tooth portion and the third tooth portion, a first coil 1011 can be arranged to be wound between the third tooth portion and the fourth tooth portion, another first coil 1011 can be arranged to be wound between the fourth tooth portion and the fifth tooth portion, and another second coil 1021 can be arranged to be wound between the fifth tooth portion and the sixth tooth portion. In this way, a plurality of first coils 1011 can be arranged in sequence along the first direction X, and a plurality of second coils 1021 can be arranged in sequence along the first direction X.

[0044] According to the primary winding arrangement structure 100 provided in the present application, the winding arrangement structure is changed by setting the value of the winding turns a of the first part 101 to be smaller than the value of the winding turns b of the second part 102, and by winding more turns at the end of the primary winding so that the end of the primary winding has more coil conductors, the magnetic induction intensity at both ends of the primary is increased, thereby alleviating the edge effect of the linear induction motor.

[0045] According to an embodiment of the first aspect of the present application, the primary winding arrangement structure 100 includes a multi-phase winding 10 , and at least a portion of the coil of at least one phase in the multi-phase winding 10 is a second coil 1021 .

[0046] The primary winding arrangement structure 100 includes a multi-phase winding 10, which means that the number of phases of the winding in the primary winding arrangement structure 100 is greater than or equal to three. Exemplarily, the multi-phase winding 10 may be, but is not limited to, a three-phase winding, a four-phase winding, or a five-phase winding.

[0047] At least part of the coils of at least one phase in the multi-phase winding 10 is the second coil 1021, which means that each phase of the multi-phase winding 10 can include multiple coils, and the multiple coils are arranged in sequence along the first direction X, and at least some of the coils have a winding number of b, that is, at least part of the multiple coils are the second coil 1021.

[0048] According to an embodiment of the first aspect of the present application, the multi-phase winding 10 includes a first phase sub-winding 11, a second phase sub-winding 12 and a third phase sub-winding 13, and the first phase sub-winding 11, the second phase sub-winding 12 and the third phase sub-winding 13 are alternately arranged in sequence along the first direction X, and some coils of the first phase sub-winding 11, the second phase sub-winding 12 and the third phase sub-winding 13 are second coils 1021.

[0049] The first phase sub-winding 11, the second phase sub-winding 12 and the third phase sub-winding 13 are isolated from each other to form different magnetic fields during use. For example, in these embodiments of the present application, the current flow direction of one of the first phase sub-winding 11, the second phase sub-winding 12 and the third phase sub-winding 13 can be opposite to that of the other two to form magnetic fields in opposite directions.

[0050] The first phase sub-winding 11, the second phase sub-winding 12 and the third phase sub-winding 13 can each include multiple coils arranged in sequence along the first direction X. Therefore, each coil of the first phase sub-winding 11, the second phase sub-winding 12 and the third phase sub-winding 13 can be the first coil 1011 or the second coil 1021.

[0051] The first phase sub-winding 11, the second phase sub-winding 12 and the third phase sub-winding 13 are arranged alternately in sequence along the first direction X, which means that along the first direction X, the multi-phase winding 10 is arranged in the order of the first phase sub-winding 11, the second phase sub-winding 12 and the third phase sub-winding 13.

[0052] The first phase sub-winding 11, the second phase sub-winding 12 and the third phase sub-winding 13 all have a partial coil which is the second coil 1021, which means that the number of winding turns of the partial coils of the first phase sub-winding 11, the second phase sub-winding 12 and the third phase sub-winding 13 is b. In other words, the first phase sub-winding 11, the second phase sub-winding 12 and the third phase sub-winding 13 all have a partial coil which is in the area of ​​the second portion 102.

[0053] For example, please refer to Figure 4 , taking the application of the primary winding arrangement structure 100 to an 80-slot 8-pole three-phase linear induction motor as an example, Figure 4 The numbers "1 to 80" in the first row shown represent slots 1 to 80 of the primary iron core; the letters "NA", "A", "NC", "C", "NB", and "B" in the second and fourth rows respectively represent the three phases of the linear induction motor, wherein "A" and "NA" adjacent along the first direction X are one phase, "B" and "NB" adjacent are one phase, and "C" and "NC" adjacent are one phase; the numbers in the third and fifth rows represent the number of winding turns of each coil in each slot; the numbers in the sixth row represent the total number of turns of each coil in each slot.

[0054] In these embodiments of the present application, along one end of the first direction X, part of the coil in the "NB-B" phase is located in the first part 101, and the number of winding turns of the coil is "2", and part of the coil is located in the second part 102, and the number of winding turns of the coil is "3"; along the other end of the first direction X, part of the coil in the "NA-A" phase is located in the first part 101, and the number of winding turns of the coil is "2", and part of the coil is located in the second part 102, and the number of winding turns of the coil is "3".

[0055] In the second aspect, an embodiment of the present application provides a primary 1000, including an iron core 200 and a primary winding arrangement structure 100 as provided in any embodiment of the first aspect of the present application, the iron core 200 includes a yoke 201 and a plurality of teeth 202, the yoke 201 is arranged along a first direction X, the plurality of teeth 202 are arranged on one side of the yoke 201 along the first direction X, and the plurality of teeth 202 are arranged in sequence along the first direction X; each first coil 1011 is wound between two teeth 202, and each second coil 1021 is wound between two teeth 202.

[0056] The iron core 200 is formed by stacking silicon steel sheets, the primary winding arrangement structure 100 is disposed on the iron core 200, and the magnetic flux lines generated by the winding can pass through the iron core 200, having good magnetic induction performance.

[0057] The yoke 201 is connected to the plurality of teeth 202 . A possible implementation is that the plurality of teeth 202 and the yoke 201 are integrally formed.

[0058] The yoke 201 is disposed along the first direction X, which means that the length direction of the yoke 201 is taken as the first direction X.

[0059] A plurality of teeth 202 are arranged on one side of the yoke 201 along the first direction X, which means that the plurality of teeth 202 are arranged on one side of the yoke 201 along the length direction, and the plurality of teeth 202 are arranged in sequence along the first direction X to form a plurality of winding slots arranged along the first direction X on the iron core 200. During the installation of the primary 1000, the pre-wound winding can be inserted into the winding slot along the setting direction of the plurality of teeth 202 to achieve the connection between the winding and the iron core 200.

[0060] Each first coil 1011 is wound between two teeth 202, and each second coil 1021 is wound between two teeth 202. A possible implementation is that one end of each first coil 1011 / second coil 1021 along the first direction X is wound around a tooth 202, and the other end is wound around another tooth 202, and multiple teeth 202 may be spaced therebetween.

[0061] Exemplarily, taking the span of the first coil 1011 and the second coil 1021 as 8, one end of the first coil 1011 / the second coil 1021 along the first direction X is wound around a tooth portion 202, and the other end is wound around another tooth portion 202 after being spaced by 8 winding slots.

[0062] According to the primary 1000 provided in the embodiment of the present application, by setting the primary winding arrangement structure 100, since the value of the winding turns a of the first part 101 is less than the value of the winding turns b of the second part 102, the winding arrangement structure is changed, and more turns are wound at the end of the primary winding so that the end of the primary winding has more coil conductors, thereby increasing the magnetic induction intensity at both ends of the primary, thereby alleviating the edge effect of the linear induction motor.

[0063] According to an embodiment of the second aspect of the present application, the plurality of teeth 202 are arranged along a second direction Y, and the second direction Y intersects with the first direction X and is not perpendicular to it.

[0064] The plurality of teeth 202 are arranged along the second direction Y, which means that the plurality of teeth 202 extend from one side of the yoke 201 along the first direction X and extend along the second direction Y intersecting the first direction X.

[0065] The second direction Y intersects with the first direction X and is not perpendicular, and its purpose is to control the motor pitch to better suppress the 5th and 7th harmonics of the linear induction motor. For example, in an embodiment where the product is an 80-slot 8-pole three-phase linear induction motor, according to the magnetomotive force harmonic suppression law, the pole pitch of the motor is τ=72 / 8=9, multiplied by the short-pitch coefficient 5 / 6, so as to better suppress the 5th and 7th harmonics by using the winding of this coefficient. At this time, the motor pitch y should be y=7.5. Since the motor winding pitch selection pitch can only be selected as an integer, the pitch is 7 or 8, but this will lead to a decrease in harmonic suppression capability.

[0066] Therefore, in these embodiments of the present application, by selecting the value of the pitch y as y and arranging the multiple teeth 202 along the second direction Y, an effect equivalent to the pitch y=7.5 is formed, thereby further improving the effect of the motor in suppressing the 5th and 7th harmonics.

[0067] In these embodiments of the present application, the angle between the second direction Y and the first direction X can be selected according to the specification parameters of the actual product to better achieve the effect of adjusting the motor pitch.

[0068] According to an embodiment of the second aspect of the present application, in a cross section of the primary winding arrangement structure 100 perpendicular to the third direction Z, the shape of the multiple conductors in each first coil 1011 is a parallelogram, and the shape of the multiple conductors in each second coil 1021 is a parallelogram.

[0069] In these embodiments of the present application, the installation process of the winding is to first wind each coil until it is completed, and then uniformly insert the completed windings into the multiple teeth 202 of the iron core 200 along the second direction Y. In these embodiments of the present application, by setting the shape of the multiple conductors in each first coil 1011 to be a parallelogram, and the shape of the multiple conductors in each second coil 1021 to be a parallelogram, so as to adapt to the teeth 202 set along the second direction Y, a higher slot fill rate is obtained, and the electromagnetic performance is improved.

[0070] According to an embodiment of the second aspect of the present application, winding slots for accommodating the first coil 1011 and / or the second coil 1021 are formed between adjacent tooth portions 202; the ratio of the size of the positive projection of each tooth portion 202 onto the yoke portion 201 in the first direction X to the size of the winding slot in the first direction X is 0.3 to 0.8.

[0071] In these embodiments of the present application, the equivalent pitch of the motor is adjusted to match the winding pitch of the coil by setting the ratio of the size of the positive projection of each tooth portion 202 onto the yoke portion 201 in the first direction X to the size of the winding slot in the first direction X to 0.3 to 0.8, so as to meet the needs of various models of motors for suppressing the 5th and 7th harmonics.

[0072] Illustratively, in these embodiments of the present application, the ratio of the size of the orthographic projection of each tooth portion 202 onto the yoke portion 201 in the first direction X to the size of the winding slot in the first direction X may be, but is not limited to, 0.4, 0.6, or 0.7.

[0073] According to an embodiment of the second aspect of the present application, a ratio of a size of an orthographic projection of each tooth portion onto the yoke portion in the first direction to a size of the winding slot in the first direction is 0.5.

[0074] According to an embodiment of the second aspect of the present application, each first coil 1011 is wound between eight teeth 202 , and each second coil 1021 is wound between eight teeth 202 .

[0075] According to the primary 1000 provided in the embodiment of the present application, by arranging each first coil 1011 to be wound between eight teeth 202, each second coil 1021 to be wound between eight teeth 202, and the teeth 202 to be arranged along the second direction Y, the motor pitch is equivalent to y=7.5, which can better suppress the 5th and 7th harmonics; at the same time, please refer to Figure 5In these embodiments of the present application, at the end of the primary 1000, a primary winding arrangement structure 100 (non-uniform distribution) as in the present application is adopted, and the air gap flux density at the position of 2.5m to 4.7m is not much different from the arrangement method of the winding uniform distribution in the related art, and the non-uniform distribution design at 4.7m to 5m can obtain a higher air gap flux density, that is, a higher air gap flux density is obtained at the end of the primary 1000, so as to improve the magnetic induction strength of the primary 1000 at the edge and better alleviate the edge effect.

[0076] In a third aspect, an embodiment of the present application provides a linear induction motor, including a primary 1000 provided in any embodiment of the second aspect of the present application.

[0077] A person skilled in the art should understand that the discussion of any of the above embodiments is merely illustrative and is not intended to imply that the scope of protection of the present application is limited to these examples. In line with the concept of the present application, the technical features in the above embodiments or different embodiments may be combined, the steps may be implemented in any order, and there are many other variations of different aspects of one or more embodiments of the present application as described above, which are not provided in detail for the sake of simplicity.

[0078] One or more embodiments of the present application are intended to cover all such substitutions, modifications and variations that fall within the broad scope of the present application. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of one or more embodiments of the present application should be included in the protection scope of the present application.

Claims

1. A primary winding arrangement structure (100), applied to a linear induction motor, characterized in that: include: The first part (101) comprises a plurality of first coils (1011), wherein the plurality of first coils (1011) are arranged in sequence along a first direction (X), and the number of winding turns of each first coil (1011) is a; Two second parts (102) are respectively arranged at two ends of the first part (101) along the first direction (X), the second part (102) comprises a plurality of second coils (1021), the plurality of second coils (1021) are arranged in sequence along the first direction (X), and the number of winding turns of each second coil (1021) is b; a and b are both natural numbers greater than 0, and a<b.

2. The primary winding arrangement structure (100) according to claim 1, characterized in that: The primary winding arrangement structure (100) comprises a multi-phase winding (10), wherein at least a portion of the coil of at least one phase in the multi-phase winding (10) is the second coil (1021).

3. The primary winding arrangement structure (100) according to claim 2, characterized in that: The multi-phase winding (10) comprises a first phase sub-winding (11), a second phase sub-winding (12) and a third phase sub-winding (13), wherein the first phase sub-winding (11), the second phase sub-winding (12) and the third phase sub-winding (13) are alternately arranged in sequence along the first direction (X), The first phase sub-winding (11), the second phase sub-winding (12) and the third phase sub-winding (13) all have a portion of coils that are the second coils (1021).

4. A primary (1000), characterized in that Comprising an iron core (200) and a primary winding arrangement structure (100) according to any one of claims 1 to 3, the iron core (200) comprising a yoke (201) and a plurality of teeth (202), the yoke (201) being arranged along the first direction (X), the plurality of teeth (202) being arranged on one side of the yoke (201) along the first direction (X), and the plurality of teeth (202) being arranged in sequence and spaced apart along the first direction (X); Each of the first coils (1011) is wound between the two tooth portions (202), and each of the second coils (1021) is wound between the two tooth portions (202).

5. The primary (1000) according to claim 4, characterized in that The plurality of tooth portions (202) are arranged along a second direction (Y), and the second direction (Y) intersects with and is not perpendicular to the first direction (X).

6. The primary (1000) according to claim 5, characterized in that In a cross section of the primary winding arrangement structure (100) perpendicular to the third direction (Z), the shape of the plurality of conductors in each of the first coils (1011) is a parallelogram, and the shape of the plurality of conductors in each of the second coils (1021) is a parallelogram.

7. The primary stage (1000) according to claim 5, characterized in that A winding slot for accommodating the first coil (1011) and / or the second coil (1021) is formed between adjacent teeth (202); The ratio of the size of the orthographic projection of each tooth portion (202) onto the yoke portion (201) in the first direction (X) to the size of the winding slot in the first direction (X) is 0.3 to 0.

8.

8. The primary (1000) according to claim 7, characterized in that The ratio of the size of the orthographic projection of each tooth portion (202) onto the yoke portion (201) in the first direction (X) to the size of the winding slot in the first direction (X) is 0.

5.

9. The primary stage (1000) according to claim 5, characterized in that Each of the first coils (1011) is wound between the eight teeth (202), and each of the second coils (1021) is wound between the eight teeth (202).

10. A linear induction motor, characterized in that: It comprises the primary stage (1000) as claimed in any one of claims 4 to 9.

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