Magnetic suspension motor stator wire winding and inserting method and magnetic suspension motor

Abstract

The invention discloses a magnetic suspension motor stator wire winding and inserting method and a magnetic suspension motor, and the method comprises the steps: S1, a plurality of varnished wires are wound in parallel to form a coil group, the coil group comprises a plurality of coils corresponding to one phase of the motor, and the plurality of coils after winding are independently placed; s2, repeating the step S1 to form another one or more coil groups, and according to the winding direction of the coil groups, enabling the coils in the multiple coil groups to be in one-to-one correspondence and combining wire harnesses so as to form a coil combination of which the winding number is multiple times of the number of the enameled wires; s3, the ratio of the wire storage area to the inner hole area of the stator is calculated, and if the ratio is smaller than 0.3 and the number of parallel winding wires is smaller than or equal to 100, single-time double-layer laminated winding wire embedding is carried out; if the ratio is smaller than 0.3, but the number of the parallel winding wires is larger than 100, the wires are wound and inserted in a double-layer mode for multiple times; and if the ratio is greater than 0.3, multiple times of double-layer lap winding and wire embedding are carried out. According to the invention, the problems of small inner hole of the stator and large number of winding and inserting wires are solved, so that the winding and inserting difficulty of the stator is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of magnetic levitation motors, and in particular to a magnetic levitation motor stator winding method and a magnetic levitation motor. Background Art

[0002] The stator of the magnetic levitation high-speed motor has the characteristics of many enameled wire windings, few turns (number of coils per slot), few poles and small slots. In order to achieve a higher speed of the motor, the diameter of the rotor cannot be too large and the length must be reasonable. Therefore, the inner hole of the motor stator must also be designed to be small, and the total length of the core plus the coil must be shortened as much as possible, thus forming a small inner hole, a small slot, more copper wires in the slot, a large span, and strict end size requirements, which creates great difficulties for wire embedding.

[0003] Therefore, in view of the above technical problems, how to reduce the difficulty of winding the stator is a technical problem that technical personnel in this field need to solve. Summary of the invention

[0004] The purpose of the present application is to provide a method for winding the stator of a magnetic levitation motor, which solves the problem of winding the stator with a small inner hole and a large number of windings, thereby reducing the difficulty of winding the stator.

[0005] To achieve the above-mentioned purpose, the present application provides a method for winding a stator of a magnetically suspended high-speed motor, comprising:

[0006] S1: Winding a plurality of enameled wires together to form a coil group, wherein the coil group includes a plurality of coils corresponding to one phase of the motor, and placing the plurality of coils after winding separately;

[0007] S2: Repeat S1 to form another group or multiple groups of the coil groups, and according to the winding direction of the coil groups, the coils in the multiple groups of the coil groups are matched one by one and the wire bundles are merged to form and wind a coil combination whose number of coils is multiple times the number of the enameled wires;

[0008] S3: Calculate the ratio of the stator's wire storage area to the inner hole area. If the ratio is less than 0.3 and the number of parallel windings is less than or equal to 100, perform a single double-layer winding and embedding. If the ratio is less than 0.3 but the number of parallel windings is greater than 100, perform multiple double-layer winding and embedding. If the ratio is greater than 0.3, perform multiple double-layer winding and embedding.

[0009] Preferably, when the number of parallel-wound coils of the coil combination in S2 is greater than 100, the coils are combined in an amount of 1 / 2 or 1 / 3 of the number of parallel-wound coils, and the combined wire bundles are superimposed on the corresponding coils.

[0010] Preferably, during the merging process of the corresponding coils in S2, the plurality of coils in one coil group are inserted between the plurality of coils in another coil group.

[0011] Preferably, the wire storage area in S3 is the area of ​​the inner hole of the stator for storing the wire harness, and the wire storage area of ​​the double-layer stacked wire harness is: the number of parallel windings of the coil combination × twice the number of coils × the area of ​​each enameled wire.

[0012] Preferably, insulating paper for isolating the double layers of the enameled wires is provided between the double layers of the stacked wires in S3.

[0013] Preferably, the number of the enameled wires is 10, and the 10 enameled wires are wound in parallel through a winding die to form a plurality of connected coils, and the number of parallel-wound wires of each coil is 10.

[0014] Preferably, the number of coils in the coil group is eight, the eight coils correspond to eight stator slots of the stator respectively, and the number of turns of each group of coils is two turns, two turns, one turn, one turn, two turns, two turns, one turn, and one turn respectively.

[0015] Preferably, the eight coils in one coil group are parallelly spliced ​​and combined with the eight coils in another coil group to form and wind a coil combination with 20 coils.

[0016] A magnetic levitation high-speed motor comprises a stator, wherein the stator adopts the above-mentioned magnetic levitation high-speed motor stator winding method.

[0017] Compared with the prior art, the technical solution provided by this application has at least the following beneficial effects:

[0018] In view of the characteristics of the stator of the magnetic levitation high-speed motor, which has a large number of enameled wires wound in parallel, a small number of turns, a large span and a small notch, the application winds the enameled wires in parallel to form a coil group, forms multiple coil groups through multiple winding operations, and then merges the multiple coil groups in parallel to form a wire harness with a large number of windings, and the coil winding of the stator is completed; after the coil winding is completed, the wire is embedded, and before the wire is embedded, it is confirmed that the ratio of the wire storage area of ​​the stator inner hole to the inner hole area is less than 0.3, and then the wire is embedded once. If the number of parallel windings is too large, the wire embedding can be used twice or three times. Specifically, if the ratio is less than 0.3 and the number of parallel windings is less than or equal to 100, a single double-layer stacking and embedding is performed; if the ratio is less than 0.3, but the number of parallel windings is greater than 100, multiple double-layer stacking and embedding are performed; if the ratio is greater than 0.3, multiple double-layer stacking and embedding are performed. The winding method of the present application borrows the multi-wire layer relationship of the flat wire motor, solves the problem of winding with a small inner hole and a large number of windings, and effectively controls the end height of the stator wire package, thereby saving some copper wire and reducing the copper loss of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0020] Figure 1 A flow chart of a stator winding method for a magnetic levitation high-speed motor provided in an embodiment of the present application;

[0021] Figure 2 A winding flow chart provided for an embodiment of the present application;

[0022] Figure 3 This is a flowchart of the line embedding provided in an embodiment of the present application. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only 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.

[0024] It should be noted that in this embodiment, the directions or positional relationships indicated by "upper", "lower", "front", "back", etc. are based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present application. In addition, "first", "second", "third", and "fourth" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0025] In order to enable those skilled in the art to better understand the present application, the present application is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0026] In the related technology, the wire embedding process of the motor usually includes threading process, manual wire embedding process and machine wire embedding process. For the stator of the magnetic levitation high-speed motor, threading process is a more feasible method, but its disadvantages are more obvious, such as:

[0027] The patent leather is severely damaged;

[0028] The stator end connection wires cannot be controlled to be equal in length;

[0029] The messy enameled wire in the stator slot leads to an artificially high slot fill rate;

[0030] Long production cycle;

[0031] Coil shaping is difficult, etc.

[0032] However, the insulation of enameled wire is fatal in the motor. If the motor does not have a good insulation system, the life of the motor cannot be guaranteed.

[0033] In this embodiment, a method for winding the stator of a magnetic levitation high-speed motor is provided. The method greatly protects the insulation system of the motor. The length of the winding is controlled by the winding mold, and basically no three-phase imbalance occurs. At the same time, the multi-wire layer relationship of the flat wire motor in the related technology is utilized to solve the problem of winding the wire with a small inner hole and a large number of windings, and the end height of the stator coil is effectively controlled, thereby saving part of the copper wire and reducing the copper loss of the motor.

[0034] Please refer to Figure 1 The method includes a winding stage and a wire embedding stage, and specifically includes the following steps:

[0035] S1: Multiple enameled wires are wound in parallel to form a coil group, which includes multiple coils corresponding to one phase of the motor, and the multiple coils after winding are placed separately; parallel winding means placing two or more wires side by side and passing the same current, thereby reducing the resistance of the wires and increasing the current carrying capacity of the wires. In a three-phase motor, the corresponding coil groups are usually three groups, each corresponding to one phase of the motor.

[0036] Each coil group includes multiple coils, and the number of coils is determined by the stator slots of the motor stator. In related technologies, magnetic levitation high-speed motors mostly use a 24-slot, 2-level winding design, so each phase of the motor corresponds to 8 slots.

[0037] The separate placement in S1 is to place multiple coils separately, but the coils are still connected by wires.

[0038] S2: Repeat step S1 to form another group or multiple groups of coils, and match the coils in the multiple groups of coils one by one and merge the wire bundles according to the winding direction of the coil groups to form and wind a coil combination with a number of coils that is multiple times the number of enameled wires;

[0039] The winding direction of the coil group should be consistent. For example, if the first coil group is wound clockwise, the second and subsequent coil groups should also be wound clockwise, and the winding direction of the coil group should also be kept the same during the coil group merging process;

[0040] In addition, the number of coils wound in parallel in step S1 is consistent with the number of enameled wires, but when multiple coils are combined, a coil combination with a number of coils wound in parallel that is multiple times the number of enameled wires will be formed.

[0041] The above steps S1 and S2 are the winding stage. After the coil is wound, the wire embedding stage is entered as follows:

[0042] S3: Calculate the ratio of the stator's wire storage area to the inner hole area. If the ratio is less than 0.3 and the number of parallel windings is less than or equal to 100, perform a single double-layer winding embedding; if the ratio is less than 0.3, but the number of parallel windings is greater than 100, perform multiple double-layer winding embeddings; if the ratio is greater than 0.3, perform multiple double-layer winding embeddings. In other words, because the motor is more difficult to get off the line, the slot fill rate will be relatively low. The slot fill rate refers to the proportion of the space in the slot occupied by the coil after it is placed in the slot. Therefore, it is necessary to determine whether to use one or multiple embeddings based on the ratio of the wire storage area to the inner hole area and the number of parallel windings, so as to meet the wire embedding process requirements of the motor. The above-mentioned wire embedding process can refer to the multi-layer process of the flat wire stator in the relevant technology for embedding.

[0043] In summary of the above embodiments, the present application aims at the characteristics of the stator of the magnetic levitation high-speed motor, which has a large number of enameled wires wound in parallel, a small number of turns, a large span and a small notch. The enameled wires are wound in parallel to form a coil group, and multiple coil groups are formed through multiple winding operations. The multiple coil groups are then spliced ​​and merged in parallel to form a wire harness with a large number of windings. The coil winding of the stator is completed. After the coil winding is completed, the wire is embedded. Before embedding, it is confirmed that the ratio of the wire storage area to the inner hole area of ​​the stator is less than 0.3, and then the wire embedding is performed once. If the number of parallel windings is too large, the wire embedding can be used twice or three times. Specifically, please refer to Figure 3 The preparation work before wire embedding includes preparing the wire embedding mold. Before using the wire embedding mold to embed the wire, it is also necessary to calculate the ratio of the stator wire storage area to the inner hole area. If the ratio is less than 0.3 and the number of parallel windings is less than or equal to 100, a single double-layer stacking and embedding is performed; if the ratio is less than 0.3, but the number of parallel windings is greater than 100, multiple double-layer stacking and embedding are performed; if the ratio is greater than 0.3, multiple double-layer stacking and embedding are performed. The wire winding and embedding method of the present application borrows the multi-wire layer relationship of the flat wire motor, solves the problem of winding and embedding with a small inner hole and a large number of parallel windings, and effectively controls the end height of the stator wire package, so that part of the copper wire can be saved and the copper loss of the motor can be reduced.

[0044] It should be pointed out that due to the requirements of the motor's own characteristics, the number of parallel windings may be large. Therefore, in step S2, multiple merging of coil groups will gradually increase the number of parallel windings of the coil combination, and when the number of parallel windings is greater than 100, 1 / 2 or 1 / 3 of the number of parallel windings are merged to reduce the difficulty of merging, and the merged wiring harnesses are superimposed on the corresponding coils.

[0045] Please refer to Figure 2 In the winding stage, the first step is to prepare for winding, such as preparing a winding mold and installing enameled wire. The winding mold is a winding mold in the related art, and multiple enameled wires are wound through the winding mold to form a coil group. The coil group after winding is disassembled to form multiple coils, and the multiple coils are placed in parallel on the table, and each coil is placed separately.

[0046] Continue to wind another group or multiple groups of coil groups, and merge the wound coil groups with the previous coil group; specifically, after the first group of coil groups is wound, its multiple coils are placed separately, and on this basis, the multiple coils of other groups of coil groups are superimposed on the coils that have been placed separately and the wire bundles are merged, and after multiple mergers, the preset number of parallel windings is reached. In addition, in the corresponding coil merging process, the multiple coils in one coil group should be inserted between the multiple coils in another coil group, so as to increase the number of coils wound in parallel after the wire bundles are merged. After the coil groups have completed the merger of the wire bundles, the coils in the formed coil combination need to be tied and organized, and each coil is stored in a separate partition to facilitate the subsequent wire embedding operation.

[0047] In addition, since the wire embedding of the present application adopts a double-layer stacking process, the calculation formula for the wire storage area in step S3 should be: the number of coils wound in parallel × twice the number of coils × the area of ​​each enameled wire. Considering that the enameled wire needs to be stored in the inner hole of the stator, and double-layer stacking will double the number of coils in the inner hole, the wire storage area should be calculated by twice the number of coils.

[0048] At the same time, the enameled wires between the double-layer stacked wires need to be isolated with insulating paper to increase the insulation strength.

[0049] The following is a specific case to implement the winding method, as follows:

[0050] Wind a motor stator, the stator is a 24-slot 2-level winding design, the requirement is 122 parallel windings, the wire diameter is Φ0.8mm, the stator inner hole is 85mm, the span is 1-11, and the number of turns per slot is 3.

[0051] The first step is to take 10 enameled wires and wind them into a coil group through a winding mold. The coil group includes 8 coils, and the 8 coils are connected by wires. The number of parallel windings of each coil is 10. The 8 coils correspond to the 8 stator slots of the stator, and the number of turns of each coil is two turns, two turns, one turn, one turn, two turns, two turns, one turn, and one turn. After the winding is completed, each coil is placed separately on the table.

[0052] The second step is to repeat the operation of the first step, and overlap the 8 coils in the newly wound coil group in the previous group of coils in sequence to form a coil combination. The number of parallel-wound coils in the coil combination is 20.

[0053] The third step is to repeat the above operation and merge the wire harnesses. When the number of wires wound in parallel reaches 100, merge the wire harnesses according to 1 / 2 or 1 / 3 of the number of enameled wires wound in parallel to reduce the difficulty of merging.

[0054] The fourth step is to calculate the ratio of the wire storage area to the inner hole area (wire bundle area / inner hole area). Taking the above parameters as an example, the ratio between the two is (122×16×0.8×0.8×3.14) / (42.5×42.5×3.14); where 122 is the number of parallel windings, 16 is twice the number of coils, 0.8×0.8×3.14 is the cross-sectional area of ​​each enameled wire, and 42.5×42.5×3.14 is the inner hole area. π is taken as an approximate value of 3.14.

[0055] It can be seen that the ratio of the wire storage area to the inner hole area is ≤0.3, but the number of parallel-wound wires 122 is greater than 100, so two double-layer windings are required.

[0056] In the fifth step, since the number of parallel-wound coils is 122, half of the 122 coils are used for embedding, and 61 coils are used for embedding in parallel. Double-layer winding is used, and the upper layer of the coils of the first 10 stator slots is placed in the inner hole of the stator. When there is a coil in the lower layer of the corresponding stator slot, it is put down, and the 61 parallel-wound coils are completed in sequence.

[0057] The sixth step is to separate the enameled wires placed in the stator slots with insulating paper to increase the insulation strength, and then embed the other 61 wires; after completion, the stator winding is completed.

[0058] In addition, the present application also provides a magnetic levitation high-speed motor, including a stator, which adopts the above-mentioned magnetic levitation high-speed motor stator winding method, so that the magnetic levitation high-speed motor also has all the advantages of the stator.

[0059] It should be noted that, in this specification, relational terms such as first and second are merely used to distinguish one entity from other entities, but do not necessarily require or imply any actual relationship or order between these entities.

[0060] Specific examples are used herein to illustrate the principles and implementation methods of the present application, and the description of the above embodiments is only used to help understand the method and core ideas of the present application. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present application, several improvements and modifications can be made to the present application, and these improvements and modifications also fall within the scope of protection of the claims of the present application.

Claims

1. A method for winding a stator of a magnetic levitation motor, characterized in that: include: S1: Winding a plurality of enameled wires together to form a coil group, wherein the coil group includes a plurality of coils corresponding to one phase of the motor, and placing the plurality of coils after winding separately; S2: Repeat S1 to form another group or multiple groups of the coil groups, and according to the winding direction of the coil groups, the coils in the multiple groups of the coil groups are matched one by one and the wire bundles are merged to form and wind a coil combination whose number of coils is multiple times the number of the enameled wires; S3: Calculate the ratio of the stator's wire storage area to the inner hole area. If the ratio is less than 0.3 and the number of parallel windings is less than or equal to 100, perform a single double-layer winding and embedding. If the ratio is less than 0.3 but the number of parallel windings is greater than 100, perform multiple double-layer winding and embedding. If the ratio is greater than 0.3, perform multiple double-layer winding and embedding.

2. The magnetic levitation motor stator winding method according to claim 1, characterized in that: When the number of parallel-wound coils of the coil combination in S2 is greater than 100, the coils are combined according to 1 / 2 or 1 / 3 of the number of parallel-wound coils, and the combined wire bundles are superimposed on the corresponding coils.

3. The method for winding a stator of a magnetic levitation motor according to claim 1, characterized in that: During the merging process of the coils corresponding to S2, the plurality of coils in one coil group are inserted between the plurality of coils in another coil group.

4. The method for winding a stator of a magnetic levitation motor according to claim 1, characterized in that: The wire storage area in S3 is the area of ​​the inner hole of the stator for storing the wire harness. The wire storage area of ​​the double-layer stacked wire harness is: the number of parallel windings of the coil combination×twice the number of coils×the area of ​​each enameled wire.

5. The method for winding a stator of a magnetic levitation motor according to claim 1, characterized in that: Insulating paper for isolating the two layers of enameled wires is provided between the two layers of stacked wires in S3.

6. The method for winding a stator of a magnetic levitation motor according to any one of claims 1 to 5, characterized in that: The number of the enameled wires is 10, and the 10 enameled wires are wound in parallel through a winding die to form a plurality of connected coils, and the number of parallel-wound wires of each coil is 10.

7. The method for winding a stator of a magnetic levitation motor according to claim 6, characterized in that: The number of coils in the coil group is eight, the eight coils correspond to eight stator slots of the stator respectively, and the number of turns of each group of coils is two turns, two turns, one turn, one turn, two turns, two turns, one turn, and one turn respectively.

8. The method for winding a stator of a magnetic levitation motor according to claim 7, characterized in that: The eight coils in one coil group are parallelly spliced ​​and combined with the eight coils in another coil group to form and wind a coil combination with 20 coils.

9. A magnetic levitation motor, comprising a stator, characterized in that: The stator adopts the magnetic levitation motor stator winding method according to any one of claims 1-8.

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