Stator winding wiring method of flat wire motor, stator winding and flat wire motor

Abstract

The invention discloses a wiring method of a stator winding of a flat wire motor, the stator winding and the flat wire motor, and relates to the technical field of motors, the method comprises the following steps: according to a design structure of the flat wire motor, a conductor in a stator winding slot is divided into multiple groups of sub-windings along an inner diameter direction, and the design structure of the flat wire motor comprises a total slot number, a total pole number and a total layer number; determining the number of parallel branches of the multiple groups of sub-windings according to the total pole number, wherein the number of the parallel branches is a divisor of the total pole number; determining the conductor layer number of the multiple groups of sub-windings according to the total layer number; and determining the wiring structure of the stator winding according to the number of parallel branches and the number of conductor layers. Since the conductors in the stator winding slots are divided into multiple groups, and each group adopts different parallel branches, more series turns of each phase can be realized through the combination of the parallel branches and the conductor layer, the optional range of the series turns of each phase is greatly improved, the expansion and optimization of the series turns of each phase winding are realized, and the service life of the stator winding is prolonged. Therefore, the requirements of driving motors with different voltages and performances can be met.

Description

Technical Field

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

[0002] New energy vehicle drive motors generally use flat wire motors, which have outstanding advantages such as compact structure and high power density. Existing flat wire motors generally adopt 48 slots and 8 poles or 54 slots and 6 poles. The number of layers of flat wire is generally 6 or 8. Among them, 48 slots and 8 poles are the most widely used because of their smaller pole pitch and shorter ends.

[0003] Although flat wire motors are widely used, due to the number of poles, there are only a few options for the number of parallel branches, so the number of series turns per phase of the winding can only be selected from a limited number of options. For the different voltage and performance requirements of new energy vehicle motors, the adjustable range of the number of series turns per phase is very small, which is difficult to meet various design requirements, which has an adverse effect on the optimization of motor performance. Summary of the invention

[0004] The main purpose of the present application is to provide a stator winding connection method for a flat wire motor, a stator winding and a flat wire motor, aiming to solve the technical problem that due to the number of poles of the flat wire motor, there are only a few options for the number of parallel branches, which makes the adjustable range of the number of series turns per phase very small and difficult to meet various design requirements.

[0005] To achieve the above-mentioned purpose, the present application proposes a stator winding connection method for a flat wire motor, the method comprising:

[0006] According to the design structure of the flat wire motor, the conductor in the stator winding slot of the flat wire motor is divided into a plurality of groups of sub-windings along the inner diameter direction, the flat wire motor is a three-phase motor, and the design structure of the flat wire motor includes a total number of slots, a total number of poles, and a total number of layers;

[0007] Determining the number of parallel branches of each of the plurality of groups of sub-windings according to the total number of poles of the design structure, wherein the number of parallel branches is a divisor of the total number of poles;

[0008] Determining the number of conductor layers of each of the plurality of groups of sub-windings according to the total number of layers of the design structure;

[0009] The connection structure of the stator winding is determined according to the number of parallel branches and the number of conductor layers.

[0010] In one embodiment, when the plurality of groups of sub-windings are two groups of sub-windings, the two groups of sub-windings use different numbers of parallel branches, and the step of dividing the conductors in the stator winding slots of the flat wire motor into the plurality of groups of sub-windings along the inner diameter direction according to the design structure of the flat wire motor comprises:

[0011] According to the design structure of the flat wire motor, the slots are numbered in sequence from the slot bottom to the slot opening along the inner diameter direction of the stator winding of the flat wire motor;

[0012] The stator winding is divided into two groups of sub-windings according to the order of numbers.

[0013] In one embodiment, the numbers of conductor layers of the two groups of sub-windings are both even numbers, and the sum of the numbers of conductor layers of the two groups of sub-windings is equal to the total number of layers.

[0014] In one embodiment, both groups of sub-windings are connected in a wave winding manner, and the two groups of sub-windings are connected in series.

[0015] In one embodiment, the two groups of sub-windings include a first sub-winding and a second sub-winding, and two adjacent branches of the second sub-winding are connected in parallel and then connected in series with the branch of the first sub-winding.

[0016] In one embodiment, the conductor of the first sub-winding is located in the slot bottom direction, and the conductor of the second sub-winding is located in the slot opening direction;

[0017] The conductor cross-sectional area of ​​the first sub-winding is twice the conductor cross-sectional area of ​​the second sub-winding.

[0018] In one embodiment, the number of conductors included in each parallel branch of the first sub-winding and the second sub-winding and the phase of the conductors in space are symmetrical;

[0019] The back electromotive force generated by each parallel branch of the first sub-winding and the second sub-winding is the same.

[0020] In one embodiment, the wiring pitches of the first sub-winding and the second sub-winding do not affect each other.

[0021] In addition, to achieve the above-mentioned purpose, the present application also proposes a stator winding, which is obtained by wiring the stator winding wiring method of the flat wire motor as described above.

[0022] In addition, to achieve the above-mentioned purpose, the present application also proposes a flat wire motor, which includes the stator winding as described above.

[0023] One or more technical solutions proposed in the present application have at least the following technical effects: The present application proposes a stator winding connection method for a flat wire motor, firstly, according to the design structure of the flat wire motor, the conductors in the stator winding slots of the flat wire motor are divided into multiple groups of sub-windings along the inner diameter direction, wherein the flat wire motor is a three-phase motor, and the design structure of the flat wire motor includes the total number of slots, the total number of poles and the total number of layers; then, according to the total number of poles of the design structure, the number of parallel branches of each of the multiple groups of sub-windings is determined, and the number of parallel branches is a divisor of the total number of poles; then, according to the total number of layers of the design structure, the number of conductor layers of each of the multiple groups of sub-windings is determined; finally, according to the number of parallel branches and the number of conductor layers, the connection structure of the stator winding is determined. Since the present application divides the conductors in the stator winding slots into multiple groups, each group uses a different number of parallel branches. Through the combination of the number of parallel branches and the number of layers, more series turns per phase can be achieved, which greatly improves the optional range of series turns per phase, and realizes the expansion and optimization of the number of series turns of each phase winding, thereby meeting the requirements of drive motors with different voltages and performances, and realizing the optimized design of the winding. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0025] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the embodiments or the description of the prior art. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0026] Figure 1 A schematic diagram of a flow chart of a stator winding connection method for a flat wire motor according to a first embodiment of the present application;

[0027] Figure 2 A wiring diagram of different numbers of parallel branches provided in Example 1 of the present application;

[0028] Figure 3 The wiring diagram of the 48-slot 8-pole winding with a1=2, a2=4, l1=2, l2=6 and full-pitch flat wire provided in the first embodiment of the present application;

[0029] Figure 4 A schematic diagram of the numbering and grouping of flat wire conductors in each slot with l1=2 and l2=6 provided in the first embodiment of the present application;

[0030] Figure 5 The connection diagram of the A phase of the 48-slot 8-pole winding with a1=2, a2=4, l1=2, l2=6 and full-pitch flat wire provided in the second embodiment of the present application;

[0031] Figure 6 The connection diagram of the A phase of the 48-slot 8-pole winding with a1=2, a2=4, l1=4, l2=4 and full-pitch flat wire provided in the second embodiment of the present application;

[0032] Figure 7 A schematic diagram of the numbering and grouping of the flat wire conductors in each slot with l1=4 and l2=4 provided in the second embodiment of the present application;

[0033] Figure 8 The connection diagram of the A phase of the 48-slot 8-pole winding with a1=2, a2=4, l1=4, l2=4 and full-pitch flat wire provided in the second embodiment of the present application;

[0034] Fig. 9 This is the connection diagram of phase A of the short-distance flat wire winding with 48 slots and 8 poles, a1=2, a2=4, l1=4, l2=4, provided in Example 3 of the present application.

[0035] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0036] It should be understood that the specific embodiments described herein are only used to explain the technical solutions of the present application and are not used to limit the present application.

[0037] In order to better understand the technical solution of the present application, a detailed description will be given below in conjunction with the accompanying drawings and specific implementation methods.

[0038] It should be noted that the voltage (back EMF) of the flat wire motor is matched by the number of series turns of each phase winding. For a three-phase motor, the number of series turns of each phase winding satisfies the following formula:

[0039] N1=Z*l / (6a);

[0040] Among them, N1 is the number of series turns per phase, Z is the number of slots, l is the number of conductor layers per slot, and a is the number of parallel branches.

[0041] Although the 48-slot 8-pole flat wire motor is widely used, due to the number of poles being 8, the number of parallel branches a is limited to 1, 2, 4, 8, etc., as shown in Table 1:

[0042] Table 1: Number of series turns per phase N1 for 48-slot 8-pole flat wire motor

[0043]

[0044] According to Table 1, the number of series turns N1 per phase of the winding can only be selected from a limited number of options. For the different voltage and performance requirements of new energy vehicle motors, it is difficult to meet various design requirements because the adjustable range of the number of series turns per phase is very small.

[0045] For example, for the classic 48-slot 8-pole 8-layer flat wire motor, Table 1 gives the number of series turns per phase for different parallel branch numbers a and layer numbers l. For the 8-layer flat wire winding, the number of series turns per phase is only 16 and 32 (8 and 64 are rarely used in practice and can be ignored); for the 6-layer flat wire winding, the number of series turns per phase is only 12 and 24 (6 and 48 are rarely used in practice and can be ignored), which makes it difficult to match different voltage and performance requirements, and has an adverse effect on the optimization of motor performance.

[0046] In response to the above problems, the present application proposes a stator winding connection method for a flat wire motor. By dividing the conductors in the slots into multiple groups, each group adopts a different number of parallel branches. Through the combination of the number of parallel branches and the number of layers, more series turns per phase can be achieved, greatly improving the optional range of the number of series turns per phase.

[0047] It should be noted that the executor of this embodiment can be an electronic device with data processing capabilities, such as a tablet computer, a personal computer, etc., or a stator winding connection device for a flat wire motor that executes the stator winding connection method for a flat wire motor of this application, etc. This embodiment does not impose any restrictions on this.

[0048] Based on this, the present application embodiment provides a stator winding connection method for a flat wire motor, referring to Figure 1 , Figure 1 A schematic flow chart of a stator winding wiring method for a flat wire motor according to a first embodiment of the present invention.

[0049] In this embodiment, the stator winding connection method of the flat wire motor includes steps S10 to S40:

[0050] Step S10: dividing the conductors in the stator winding slots of the flat wire motor into multiple groups of sub-windings along the inner diameter direction according to the design structure of the flat wire motor, the flat wire motor is a three-phase motor, and the design structure of the flat wire motor includes the total number of slots, the total number of poles and the total number of layers.

[0051] It should be noted that the flat wire motor is a motor that uses flat winding copper wire. Compared with the traditional round wire motor, the flat wire motor can output greater power and torque in the same volume, and the loss generated during operation is relatively small, so it is widely used.

[0052] It should be noted that the stator winding is a group of coils installed on the stator of the motor.

[0053] The stator is the stationary part of the motor, and the windings are made of wires. These windings form a circuit through a specific connection method, and a magnetic field is generated when current passes through it. In flat wire motors, flat wires are used to wind the windings. The stator windings interact with the rotor to achieve the energy conversion and operation functions of the motor.

[0054] It should be noted that the conductor is the conductive part placed in the stator core slot, that is, the flat copper wire.

[0055] It should be noted that the multiple groups of sub-windings are obtained by dividing the conductor of the stator winding along the inner diameter direction into multiple groups of sub-windings with different connection methods.

[0056] It should be noted that the design structure is the winding specification of the stator winding of the flat wire motor.

[0057] The total number of slots refers to how many slots there are on the motor stator core for placing windings.

[0058] The total number of poles indicates the number of magnetic pole pairs of the motor, which determines the synchronous speed of the motor.

[0059] The total number of layers refers to how many layers the flat wires of the winding are arranged in layers.

[0060] For example, the flat wire motor is generally designed with 48 slots, 8 poles and 8 layers or 54 slots, 6 poles and 8 layers.

[0061] Step S20: Determine the number of parallel branches of each of the plurality of groups of sub-windings according to the total number of poles of the design structure, wherein the number of parallel branches is a divisor of the total number of poles.

[0062] It should be noted that the number of parallel branches is obtained by dividing the various parts of the sub-winding into several groups, and the coils in each group are connected in parallel in the circuit. The number of these parallel groups is the number of parallel branches.

[0063] It should be noted that the design of the number of parallel branches generally follows the divisor (i.e. factor) of the total number of poles.

[0064] Step S30: Determine the number of conductor layers of each of the plurality of groups of sub-windings according to the total number of layers of the design structure.

[0065] It should be noted that the number of conductor layers refers to the number of levels of conductors constituting the winding distributed in space.

[0066] For example, if there are two layers of conductors, it means that the winding is made up of two layers of conductors arranged and wound in a certain way.

[0067] It should be noted that the sum of the number of conductor layers of each group of sub-windings is equal to the total number of layers.

[0068] Step S40: determining the connection structure of the stator winding according to the number of parallel branches and the number of conductor layers.

[0069] In this embodiment, by dividing the winding into multiple groups, each group having a different number of parallel branches, and combining different numbers of conductor layers, the number of series turns of each phase winding can be expanded and optimized. Therefore, more design schemes can be developed to meet the requirements of drive motors with different voltages and performances, and to achieve the optimal design of the winding.

[0070] In a feasible implementation, the conductors in the slots are divided into two groups as an example for illustration, but this solution is not limited. When the multiple groups of sub-windings are two groups of sub-windings, the two groups of sub-windings use different numbers of parallel branches. In this embodiment, step S10 may include the following steps: according to the design structure of the flat wire motor, numbering the inner diameter direction of the stator winding of the flat wire motor from the slot bottom to the slot opening in sequence; dividing the stator winding into two groups of sub-windings according to the order of the numbers.

[0071] For ease of understanding, refer to Figure 2 , Figure 2 This is a wiring diagram of different numbers of parallel branches provided in Example 1 of the present application. Figure 2 Figures (a) and (b) are commonly used wiring methods in the prior art; as shown in the figures, A, B, and C represent three-phase access points, and the number of parallel branches in Figure (a) is a=2, that is, A1 and A2 are connected in parallel in phase A, B1 and B2 are connected in parallel in phase B, and C1 and C2 are connected in parallel in phase C; the number of parallel branches in Figure (b) is a=4, that is, A1, A2, A3, and A4 are connected in parallel in phase A, B1, B2, B3, and B4 are connected in parallel in phase B, and C1, C2, C3, and C4 are connected in parallel in phase C.

[0072] and Figure 2 Figure (c) is a wiring diagram of the stator winding wiring method of the flat wire motor of this embodiment. For the wiring method proposed in this embodiment, the series conductor expression of each phase of the three-phase motor is as follows:

[0073] N1=Z*(l1 / a1+l2 / a2) / 6;

[0074] Among them, l1 is the number of conductor layers per slot of the first group, l2 is the number of conductor layers per slot of the second group, and the total number of conductor layers l=l1+l2 (l can be 6, 8, 10, etc.); a1 is the number of parallel branches of the first group, and a2 is the number of parallel branches of the second group.

[0075] As shown in the figure, the number of parallel branches of the two groups are a1=2, a2=4 respectively, that is, A1 and A2 are connected in parallel in phase A, a1 and a2 are connected in parallel in A1, and a3 and a4 are connected in parallel in A2; B1 and B2 are connected in parallel in phase B, b1 and b2 are connected in parallel in B1, and b3 and b4 are connected in parallel in B2; C1 and C2 are connected in parallel in phase C, c1 and c2 are connected in parallel in C1, and c3 and c4 are connected in parallel in C2.

[0076] Taking the commonly used 48-slot 8-pole flat wire motor as an example, the number of parallel branches of the first group and the number of parallel branches of the second group are listed. When different numbers of conductor layers are selected, the number of series turns per phase is shown in Table 2:

[0077] Table 2: Number of series turns per phase N1 for a 48-slot 8-pole flat wire motor with a1=2, a2=4

[0078]

[0079] It can be seen from Table 2 that compared with Table 1, the number of series turns per phase has more options. For example, for the classic 48-slot 8-pole 8-layer flat wire motor, in addition to the number of series turns shown in Table 1 (16, 32), it can also be expanded to 20, 24, 28 and other series turns.

[0080] For further understanding, refer to Figure 3 , Figure 3 This is the wiring diagram of the 48-slot 8-pole a1=2, a2=4, l1=2, l2=6, full-pitch flat wire winding provided in Example 1 of the present application. As shown in the figure, the dotted line connection represents the crown end, and the solid line connection represents the welding end. The number of pole pairs of the winding is 4, and the number of parallel branches is 2. It contains three-phase windings A, B, and C, with polarities divided into N and S, and phase belts divided into combinations of A, -A, B, -B, C, and -C, and the slot numbers are from 1 to 48.

[0081] Reference at this time Figure 3 and Figure 4 , Figure 4 This is a schematic diagram of the numbering and grouping of flat wire conductors in each slot where l1=2, l2=6, provided in Example 1 of the present application. Figure 3 The numbering of the flat wire conductors in the slots of the wiring method shown (a total of 48 slots, only 1 slot is shown in the figure), including a to h, a total of 8 layers, a and b are the first group (each layer has A1, A2, B1, B2, C1, C2, and different combinations are formed by parallel wiring), c to h are the second group (each layer has a1 to a4, b1 to b4, c1 to c4, and different combinations are formed by parallel wiring), the first group has 2 layers, the number of parallel branches is 2, the second group has 6 layers, the number of parallel branches is 4, and the equivalent number of series turns per phase is 20 (which cannot be achieved by the traditional 8-layer flat wire design method). In this example, both groups of windings use full-pitch, wave windings, a1 and a2 of the second group are first connected in parallel and then in series with A1 of the first group, and a3 and a4 of the second group are first connected in parallel and then in series with A2 of the first group).

[0082] Conventional 48-slot 8-pole 8-layer flat wire windings can only obtain 32 and 16 series turns per phase (64 and 8 are basically not used) because the number of single parallel branches is 1, 2, 4, and 8; after adopting the method of this embodiment, there are two numbers of parallel branches, the number of parallel branches of the first group is 2, and the number of parallel branches of the second group is 4, and 20, 24, 28 and other series turns per phase can be achieved. The 6-layer flat wire winding also has a similar effect. Therefore, more design schemes can be expanded to meet the requirements of drive motors with different voltages and performances, and to achieve the optimal design of the winding.

[0083] In this embodiment, the flat wire winding is divided into two groups along the inner diameter direction (such as Figure 3 , Figure 4 The 48-layer, 8-pole, 8-layer flat wire motor winding shown is numbered a to h along the inner diameter direction from the bottom of the slot to the slot mouth, with layers a and b set as the first group and layers c to h set as the second group). The two groups have different numbers of parallel branches, with the number of parallel branches in the first group being 2 and the number of parallel branches in the second group being 4. Through the above grouping, the expansion and optimization of the number of series turns of each phase winding can be achieved.

[0084] In a feasible implementation manner, in this embodiment, the number of conductor layers of the two groups of sub-windings are both even numbers, and the sum of the number of conductor layers of the two groups of sub-windings is equal to the total number of layers.

[0085] In this embodiment, each group contains an even number of winding layers, which can have different combinations. For example, if the number of conductor layers per slot is 8, the number of layers of the first group of windings can be 2, 4, or 6 (the corresponding number of layers of the second group of windings is 6, 4, and 2, respectively); if the number of conductors per layer is 6, the number of layers of the first group of windings can be 2 or 4 (the corresponding number of layers of the second group of windings is 4 and 2, respectively).

[0086] In the technical solution provided in this embodiment, the flat wire winding is divided into two groups along the inner diameter direction, and the two groups have different numbers of parallel branches and different numbers of conductor layers; finally, the connection structure of the stator winding is determined according to the number of parallel branches and the number of conductor layers. More series turns per phase can be achieved, which greatly improves the optional range of series turns per phase, realizes the expansion and optimization of the number of series turns per phase winding, thereby meeting the requirements of drive motors with different voltages and performances, and realizing the optimized design of the winding.

[0087] Based on the first embodiment of the present application, in the second embodiment of the present application, the same or similar contents as those in the above-mentioned embodiment 1 can be referred to the above introduction and will not be repeated later.

[0088] In this example, both groups of sub-windings adopt the connection method of wave winding, and the two groups of sub-windings adopt the connection method of series connection.

[0089] The two groups of sub-windings include a first sub-winding and a second sub-winding. Two adjacent branches of the second sub-winding are connected in parallel and then connected in series with the branch of the first sub-winding.

[0090] It should be noted that wave winding is a wiring form of the armature winding of a DC motor. All coils with the same polarity are connected in series in a certain order to form a wave-shaped winding. The wave winding has a small number of branch pairs and a large branch current, and is suitable for low-voltage, high-current motors.

[0091] For ease of understanding, refer to Figure 5 , Figure 5 This is the connection diagram of phase A of the 48-slot, 8-pole winding with a1=2, a2=4, l1=2, l2=6 and full-pitch flat wire winding provided in the second embodiment of the present application. Figure 5 Wiring method and Figure 3 The difference is Figure 3 A complete wiring diagram including the three-phase windings A, B, and C is given;

[0092] Figure 5 is Figure 3 Based on this, only the wiring diagram of the A-phase winding is given. The B and C-phase windings are similar to the A-phase, with a spatial difference of 120 degrees. Figure 5 The purpose is to facilitate a more concise and clear description of the wiring method of the present invention.

[0093] In this embodiment, each phase winding of the first group and the second group adopts the connection mode of wave winding (such as Figure 5 As shown), the first group and the second group are connected in series (as shown Figure 2 (c) in the figure), and the two adjacent branches of the second group are connected in parallel and then connected in series with a branch of the first group (as shown in Figure 5 In the figure, the first group includes two branches A1 and A2, and the second group includes four branches a1, a2, a3, and a4, among which a1 and a2 are connected in parallel and then in series with A1, and a3 and a4 are connected in parallel and then in series with A2).

[0094] Furthermore, in this example, the conductor of the first sub-winding is located in the slot bottom direction, and the conductor of the second sub-winding is located in the slot opening direction; the cross-sectional area of ​​the conductor of the first sub-winding is twice the cross-sectional area of ​​the conductor of the second sub-winding.

[0095] In this embodiment, since the number of parallel branches in the first group is 2 and the number of parallel branches in the second group is 4, the current of the first group of conductors is twice that of the second group of conductors. To maintain the same electrical density, the cross-sectional area of ​​the first group of conductors is approximately twice that of the second group, thus presenting an overall effect of unequal flat wire heights (e.g. Figure 4As shown in the figure, the cross-sectional area of ​​the conductor located at the slot is smaller, and the skin effect and proximity effect of the conductor at the slot are often more obvious. After adopting this solution, it is more beneficial for the conductor near the slot to reduce the influence of the skin effect and proximity effect, which is beneficial to reduce the AC copper loss of the stator, thereby improving the efficiency of the motor.

[0096] Furthermore, in this example, the number of conductors contained in each parallel branch of the first sub-winding and the second sub-winding and the phase of the conductors in space are symmetrical; the back electromotive force generated by each parallel branch of the first sub-winding and the second sub-winding is the same.

[0097] In this embodiment, the wiring method of each parallel branch of the first and second groups of windings is symmetrical, that is, the number of conductors contained in each parallel branch of the first group (including 2 parallel branches) and the conductors are completely symmetrical in spatial phase, and the back electromotive force generated is exactly the same. The number of conductors contained in each parallel branch of the second group (including 4 parallel branches) and the conductors are completely symmetrical in spatial phase, and the back electromotive force generated is also exactly the same, so as to avoid the generation of circulating current.

[0098] It should be noted that different combinations of the number of layers can implement the method of this embodiment. For ease of understanding, refer to Figure 6 , Figure 6 This is the connection diagram of phase A of the 48-slot, 8-pole winding with a1=2, a2=4, l1=4, l2=4 and full-pitch flat wire winding provided in the second embodiment of the present application.

[0099] Figure 6 and Figure 5 Compared with the first and second groups, the number of layers is changed from 2 layers and 6 layers to 4 layers and 4 layers, and the wiring method is the same as Figure 5 This figure is to give another example of this solution, to illustrate that this solution can be implemented for different combinations of layers. For this solution, the equivalent number of series turns per phase is 24 (which cannot be achieved by the traditional 8-layer flat wire design method).

[0100] Reference at this time Figure 7 , Figure 7 This is a schematic diagram of the numbering and grouping of flat wire conductors in each slot where l1=4 and l2=4 is provided in the second embodiment of the present application. Figure 7 yes Figure 6 The number and grouping of the flat wire conductors in the slots corresponding to the wiring method. The number of layers of the first group and the second group are 4 and 4 respectively, and the conductor cross-sectional area of ​​the first group is twice that of the second group.

[0101] It should be noted that when the number of parallel branches and the number of winding layers in each group are exactly the same, the wiring method can also be different. Figure 8 , Figure 8This is the connection diagram of phase A of the 48-slot, 8-pole winding with a1=2, a2=4, l1=4, l2=4 and full-pitch flat wire winding provided in the second embodiment of the present application.

[0102] Figure 8 and Figure 6 Compared with the first and second groups, the number of parallel branches and the number of winding layers in each group are exactly the same, but the wiring method of the second group is different. Figure 6 The positions of the two branches a1 and a2 in the second group differ by one slot number (ie, they are adjacent), and the positions of a3 and a4 also differ by one slot number. Figure 8 a1, a2, a3, and a4 are evenly distributed in space (12 slots apart). This diagram is to illustrate that there are multiple wiring methods when the number of parallel branches and the number of winding layers in each group are exactly the same.

[0103] In the technical solution provided in this embodiment, after adopting this solution, it is more beneficial for the conductor near the slot to reduce the influence of skin effect and proximity effect, which is beneficial to reduce the AC copper loss of the stator, thereby improving the efficiency of the motor.

[0104] Based on the above embodiments of the present application, in the third embodiment of the present application, the same or similar contents as those in the above embodiments can be referred to the above introduction and will not be repeated later.

[0105] In this example, the connection pitches of the first sub-winding and the second sub-winding do not affect each other.

[0106] It should be noted that the pitch, also known as the winding pitch, refers to the number of slots spanned between two effective sides of a winding element.

[0107] For ease of understanding, refer to Fig. 9 , Fig. 9 This is the connection diagram of phase A of the short-distance flat wire winding with 48 slots and 8 poles, a1=2, a2=4, l1=4, l2=4, provided in Example 3 of the present application. Fig. 9 and Figure 6 The number of parallel branches and the number of winding layers in each group are exactly the same. The difference is Figure 6 The second group uses full-pitch windings. Fig. 9 The second group of the scheme adopts a short pitch. Both full pitch and short pitch are commonly used winding connection methods. Short pitch can appropriately improve the harmonic content of the winding. This figure is mainly to illustrate that the pitches of the first and second groups of this scheme are relatively independent, and full pitch and short pitch can coexist.

[0108] In this embodiment, the connection methods of the first group of windings and the second group of windings are relatively independent. In addition to the number of parallel branches, their pitches (such as Figure 6 The first and second windings of the 3D-type ... Fig. 9 The first group is full distance, the second group is short distance), and the wiring methods can be different.

[0109] It should be noted that the above examples are only used to understand the present application and do not constitute a limitation on the stator winding connection method of the flat wire motor of the present application. More simple transformations based on this technical concept are all within the protection scope of the present application.

[0110] The present application also provides a stator winding, which is obtained by wiring using the stator winding wiring method of the flat wire motor as described above.

[0111] The stator winding provided in the present application adopts the stator winding connection method of the flat wire motor in the above embodiment, which can solve the technical problem that the number of parallel branches of the flat wire motor has only a few choices due to the number of poles, making the adjustable range of the number of series turns per phase very small and difficult to meet various design requirements. Compared with the prior art, the beneficial effects of the stator winding provided in the present application are the same as the beneficial effects of the stator winding connection method of the flat wire motor provided in the above embodiment, and the other technical features in the stator winding are the same as the features disclosed in the above embodiment method, which will not be repeated here.

[0112] The present application also provides a flat wire motor, the flat wire motor comprising the stator winding as described above. Compared with the prior art, the beneficial effects of the flat wire motor provided by the present application are the same as the beneficial effects of the stator winding connection method of the flat wire motor provided by the above embodiment, and other technical features in the flat wire motor are the same as the features disclosed in the above embodiment method, which will not be repeated here.

[0113] The above descriptions are only some embodiments of the present application, and are not intended to limit the patent scope of the present application. All equivalent structural changes made using the contents of the present application specification and drawings under the technical concept of the present application, or direct / indirect applications in other related technical fields are included in the patent protection scope of the present application.

Claims

1. A method for connecting stator windings of a flat wire motor, characterized in that: The method includes: According to the design structure of the flat wire motor, the conductor in the stator winding slot of the flat wire motor is divided into a plurality of groups of sub-windings along the inner diameter direction, the flat wire motor is a three-phase motor, and the design structure of the flat wire motor includes a total number of slots, a total number of poles, and a total number of layers; Determining the number of parallel branches of each of the plurality of groups of sub-windings according to the total number of poles of the design structure, wherein the number of parallel branches is a divisor of the total number of poles; Determining the number of conductor layers of each of the plurality of groups of sub-windings according to the total number of layers of the design structure; The connection structure of the stator winding is determined according to the number of parallel branches and the number of conductor layers.

2. The method according to claim 1, characterized in that When the multiple groups of sub-windings are two groups of sub-windings, the two groups of sub-windings use different numbers of parallel branches, and the step of dividing the conductors in the stator winding slots of the flat wire motor into multiple groups of sub-windings along the inner diameter direction according to the design structure of the flat wire motor includes: According to the design structure of the flat wire motor, the slots are numbered in sequence from the slot bottom to the slot opening along the inner diameter direction of the stator winding of the flat wire motor; The stator winding is divided into two groups of sub-windings according to the order of numbers.

3. The method according to claim 2, characterized in that The numbers of conductor layers of the two groups of sub-windings are both even numbers, and the sum of the numbers of conductor layers of the two groups of sub-windings is equal to the total number of layers.

4. The method according to any one of claims 2 to 3, characterized in that The two groups of sub-windings both adopt the connection mode of wave winding, and the two groups of sub-windings adopt the connection mode of series connection.

5. The method according to claim 4, characterized in that The two groups of sub-windings include a first sub-winding and a second sub-winding. Two adjacent branches of the second sub-winding are connected in parallel and then connected in series with the branch of the first sub-winding.

6. The method according to claim 5, characterized in that The conductor of the first sub-winding is located in the direction of the slot bottom, and the conductor of the second sub-winding is located in the direction of the slot opening; The conductor cross-sectional area of ​​the first sub-winding is twice the conductor cross-sectional area of ​​the second sub-winding.

7. The method according to claim 5, characterized in that The number of conductors included in each parallel branch of the first sub-winding and the second sub-winding and the phase of the conductors in space are symmetrical; The back electromotive force generated by each parallel branch of the first sub-winding and the second sub-winding is the same.

8. The method according to claim 7, characterized in that The connection pitches of the first sub-winding and the second sub-winding do not affect each other.

9. A stator winding, characterized in that: The stator winding is obtained by wiring the stator winding wiring method of a flat wire motor according to any one of claims 1 to 8.

10. A flat wire motor, characterized in that: The flat wire motor comprises the stator winding according to claim 9.

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