Motor stator, motor and vehicle

Abstract

The utility model relates to the technical field of motors, in particular to a motor stator, a motor and a vehicle. A plurality of stator grooves are formed in the circumferential direction of the stator core, and each stator groove comprises a notch close to the center of the stator core; the winding comprises a plurality of wires arranged in the stator slots along the radial direction of the stator core, and the cross sectional areas of at least a first wire and a second wire in the wires are smaller than the cross sectional areas of other wires. Wherein the first lead and the second lead are two leads which are continuously arranged from the notch to the direction far away from the center of the stator core; by reducing the thickness of part of the lead in the stator slot, the loss of the motor can be reduced, and the working efficiency of the motor is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of motors, and in particular to a motor stator, a motor and a vehicle. Background Art

[0002] The high efficiency of the drive motor is one of the key technical requirements for electric vehicles. Compared with traditional round wire motors, flat wire motors have a higher stator slot fill rate, smaller winding DC resistance, and higher motor efficiency, and are therefore widely used in electric vehicles.

[0003] like Figure 2 As shown in FIG. 1 , a schematic diagram of a local structure of a motor stator of an existing flat wire motor is shown. However, at high speeds, the skin effect and proximity effect in the conductor of the flat wire motor will cause serious AC losses, thereby reducing the working efficiency of the motor. Figure 3 As shown, for Figure 2 The improved plan for the flat wire motor is to double the number of conductor layers in the stator slots of the original motor stator, so as to suppress the AC loss of the motor in the high speed area with a larger number of conductor layers in the slots. However, research has found that this will cause the DC resistance of the motor to increase and the working efficiency of the motor to decrease. Utility Model Content

[0004] In view of the above shortcomings of the prior art, the purpose of the present utility model is to provide a motor stator, a motor and a vehicle, which can reduce the thickness of some wires in the stator slots, thereby ensuring that the DC resistance of the motor is not too large and reducing the motor loss, thereby improving the working efficiency of the motor.

[0005] In order to achieve the above-mentioned object and other related objects, the utility model provides a motor stator, comprising:

[0006] A stator core having a plurality of stator slots arranged in a circumferential direction, wherein the stator slots include a notch near the center of the stator core;

[0007] The winding comprises a plurality of conductors arranged in the stator slots along the radial direction of the stator core, wherein at least the first conductor and the second conductor have a cross-sectional area smaller than the cross-sectional area of ​​the other conductors, wherein the first conductor and the second conductor are two conductors continuously arranged in the direction away from the center of the stator core from the slot.

[0008] In an optional embodiment of the present invention, the width of each conductor in each stator slot gradually widens from the slot opening toward a direction away from the center of the stator core along the radial direction of the stator core.

[0009] In an optional embodiment of the present invention, the width of each stator slot changes adaptively following the change of the wire width.

[0010] In an optional embodiment of the present invention, in each of the stator slots, at least the sum of the cross-sectional areas of the first conductor and the second conductor is less than or equal to the cross-sectional area of ​​any other single conductor.

[0011] In an optional embodiment of the present invention, in each of the stator slots, at least the first conductor and the second conductor have equal cross-sectional areas.

[0012] In an optional embodiment of the present invention, in each of the stator slots, at least the cross-sectional areas of the other conductors other than the first conductor and the second conductor are equal.

[0013] In an optional embodiment of the present invention, in the same stator slot, the first conductive wire and the second conductive wire are electrically connected at both ends of the stator core, and the first conductive wire and the second conductive wire both have a complete insulating coating.

[0014] In an optional embodiment of the present invention, the winding is a three-phase winding, and the windings of each phase are uniformly spaced at an electrical angle of 120° in sequence along the circumference of the stator core.

[0015] In order to achieve the above-mentioned purpose and other related purposes, the utility model provides a motor, including the motor stator.

[0016] In order to achieve the above-mentioned object and other related objects, the utility model provides a vehicle including the above-mentioned motor.

[0017] In summary, the utility model improves the full slot rate of the motor by using flat wire windings; by reducing the thickness of only part of the wire in the stator slot, such as by reducing the thickness of only the wire near the slot mouth of the stator slot, it ensures that the DC resistance of the motor will not be too large and can suppress the AC loss of the motor in the high speed area, thereby improving the working efficiency of the motor and ensuring the efficient and stable operation of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the utility model 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 some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 This is a schematic diagram of the partial structure of the motor stator according to an embodiment of the utility model;

[0020] Figure 2 It is a schematic diagram of a local structure of a motor stator in the prior art;

[0021] Figure 3 For Figure 2 A schematic diagram of the local structure of the motor stator after the motor stator is improved;

[0022] Figure 4 This is a comparison chart of motor losses before and after the motor stator is improved in this case;

[0023] Figure 5 This is a schematic diagram of the structure of the improved stator slot of one embodiment of the utility model;

[0024] Figure 6 This is a cross-sectional view of the complete structure of the motor stator in one embodiment of the utility model;

[0025] Figure 7 A schematic diagram of the wire connection of each phase winding in an embodiment of the utility model;

[0026] Figure 8 It is a schematic diagram of the wire connection of one phase in an embodiment of the utility model;

[0027] Fig. 9 Schematic diagram of the stator structure of a motor in an embodiment of the present case;

[0028] Description of component numbers: stator slot S, slot S0, wire Sx-y, first wire Sx-1, second wire Sx-2, wire S1-1 of the first layer of the first stator slot, wire S1-2 of the second layer of the first stator slot, wire S1-3 of the third layer of the first stator slot, wire S1-4 of the fourth layer of the first stator slot, wire S1-5 of the fifth layer of the first stator slot, wire S1-6 of the sixth layer of the first stator slot. DETAILED DESCRIPTION

[0029] The following describes the implementation of the present invention through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific implementations, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the following embodiments and the features in the embodiments can be combined with each other without conflict. It should also be understood that the terms used in the embodiments of the present invention are intended to describe specific implementation schemes, rather than to limit the scope of protection of the present invention. The test methods for which specific conditions are not specified in the following examples are usually carried out under conventional conditions or under the conditions recommended by the manufacturers.

[0030] See also Figures 1 to 9It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the restrictive conditions for the implementation of the utility model, so they have no substantive technical significance. Any modification of the structure, change in the proportion relationship or adjustment of the size, without affecting the effect and purpose that can be achieved by the utility model, should still fall within the scope of the technical content disclosed by the utility model.

[0031] In this case, the skin effect at the slot S0 of the motor stator refers to the uneven current distribution inside the wire Sx-y under high-frequency alternating current, resulting in a greater current density closer to the surface of the wire Sx-y. The mechanism of the skin effect is mainly related to the eddy current in the electromagnetic field. When the alternating current flows through the wire Sx-y, a changing magnetic field will be generated around the wire Sx-y, and this changing magnetic field will generate an induced current in the wire Sx-y, that is, eddy current; the electromagnetic field generated by these eddy currents in the wire Sx-y interacts with the electromagnetic field of the original current, resulting in a decrease in the magnetic flux at the center of the wire Sx-y, so that the current tends to concentrate on the surface area of ​​the wire Sx-y. At the same time, when the motor is running at a high speed, due to the skin effect and proximity effect, the wire Sx-y will generate additional AC resistance. The size of the AC resistance is closely related to the skin depth and the cross-sectional area of ​​the wire Sx-y. The factors affecting the skin depth are shown in formula (1). The higher the motor speed, the smaller the skin depth, the more obvious the skin effect, the larger the radial cross-sectional area of ​​the wire Sx-y, the more serious the skin effect and proximity effect, and the greater the AC loss of the wire Sx-y. The skin depth formula is as follows:

[0032]

[0033] δ is the skin depth; ρ is the conductor resistivity; μ0 is the vacuum permeability; μ c is the relative magnetic permeability of the conductor; f is the frequency.

[0034] like Figure 1 As shown, the utility model provides a motor stator, including a stator core and a winding; a plurality of stator slots S are arranged circumferentially of the stator core, and the stator slots S include a notch S0 close to the center of the stator core; the winding includes a plurality of wires Sx-y arranged in the stator slots S along the radial direction of the stator core, and among each of the wires Sx-y, at least the cross-sectional area of ​​the first wire Sx-1 and the second wire Sx-2 is smaller than the cross-sectional area of ​​the other wires Sx-y, wherein the first wire Sx-1 and the second wire Sx-2 are two wires Sx-y continuously arranged in the direction away from the center of the stator core at the notch S0.

[0035] In this case, in the conductor Sx-y, x and y are positive integers, and x≥1, y≥1, S represents any stator slot, one of the stator slots S is defined as the first stator slot S1, Sx represents the xth stator slot in the circumferential direction of the stator core, and Sx-y represents the yth layer of the conductor in the xth stator slot.

[0036] It should be noted that the stator core is in a ring shape, and the ring-shaped stator core is evenly provided with a plurality of stator slots S in the circumferential direction; this case is mainly discussed using a three-phase motor as an example, and the conductor Sx-y described in this case is mainly for flat wire conductors. It should be understood that this case is also applicable to motors of other phases according to actual needs. In this case, each flat wire conductor Sx-y is arranged in the corresponding stator slot S along the radial direction of the stator core, and the cross-sectional area direction of the conductor Sx-y is the direction of the stator slot S toward the center of the stator core, that is, the radial direction of the stator core; it should be understood that among each of the conductors Sx-y, at least the cross-sectional area of ​​the first conductor Sx-1 and the second conductor Sx-2 is smaller than the cross-sectional area of ​​the other conductors Sx-y, wherein the first conductor Sx-1 and the second conductor Sx-2 are the slots S0 away from the center of the stator core. There are two wires Sx-y arranged continuously in the direction of the conductor, and according to actual needs, there may also be a third wire Sx-3, a fourth wire Sx-4 and more wires Sx-y, and the cross-sectional areas of the third wire Sx-3, the fourth wire Sx-4 and more wires Sx-y are smaller than the cross-sectional areas of other wires Sx-y, where the other wires Sx-y do not include the first wire Sx-1, the second wire Sx-2, the third wire Sx-3, the fourth wire Sx-4 and more wires Sx-y; and since at least the first wire The cross-sectional area of ​​the wire Sx-1 and the second wire Sx-2 is smaller than the cross-sectional area of ​​the other wires Sx-y, which means that the total number of the first wire Sx-1 and the second wire Sx-2 and the more wires Sx-y in each stator slot S is smaller than the total number of the wires Sx-y in each stator slot S, that is, there must be at least one wire Sx-y having a cross-sectional area larger than the cross-sectional area of ​​the first wire Sx-1 and the second wire Sx-2 and the more wires Sx-y that are the same as the first wire Sx-1 and the second wire Sx-2; Among them, the first wire Sx-1, the second wire Sx-2, the third wire Sx-3, the fourth wire Sx-4 and more wires Sx-y are wires Sx-y arranged continuously from the slot S0 to the direction away from the center of the stator core, wherein the first wire Sx-1 and the second wire Sx-2 can be two wires Sx-y close to the slot S0 and arranged in sequence from the slot S0 to the direction away from the center of the stator core, that is, the first wire Sx-1 is the one closest to the slot S0. Of course, according to actual needs, the first wire Sx-1 and the second wire Sx-2 can also be two wires Sx-y away from the slot S0 and arranged in sequence from the center of the stator core to the slot S0, that is, the first wire Sx-1 can also be the one farthest from the slot S0.

[0037] It should be further explained that, since the conductor Sx-y of the motor stator is a flat wire conductor, and at a high speed of the flat wire motor, the skin effect and proximity effect in the conductor Sx-y of the flat wire motor will produce serious AC loss and thus reduce the working efficiency of the motor; however, through research, it is found that the closer the conductor Sx-y is to the slot S0, the more serious the skin effect and proximity effect will be. Therefore, in this case, the cross-sectional area of ​​the conductor Sx-y close to the slot S0 is reduced, such as reducing the cross-sectional area of ​​the first conductor Sx-1 and the second conductor Sx-2, thereby suppressing the AC loss of the motor in the high speed area and improving the working efficiency of the motor. It should be understood that the cross-sectional areas of the third wire Sx-3 and the fourth wire Sx-4 in the wire Sx-y near the slot S0 can also be reduced, but it should also be noted that the more wires Sx-y with reduced cross-sectional areas, the better, because too many wires Sx-y with reduced cross-sectional areas will also cause the DC resistance of the flat wire motor to increase, and will also reduce the motor efficiency. In addition, since the cross-sectional area of ​​the wire Sx-y is reduced, the number of layers of the wire Sx-y increases, which will also increase the complexity of the production process. Therefore, in this case, the cross-sectional areas of the first wire Sx-1 and the second wire Sx-2 near the slot S0 are preferably reduced, but it should be understood that for motors of different powers, the number of wires Sx-y with reduced cross-sectional areas can be selected according to the actual degree of AC loss and the size of the DC resistance. An optimal number.

[0038] like Figure 4 As shown in FIG. 1 , it is a comparison diagram of AC loss before and after the motor stator is improved in this case, where M represents the existing scheme before the improvement of this case, and the local structure of the motor stator is as follows: Figure 2 As shown; N represents the improved scheme of this case, and its motor stator local structure is as follows Figure 1 As shown; through the comparison results of motor losses, it can be seen that at the peak operating point of 4000rpm, the motor using this solution has a 2.2% reduction in loss compared with the motor before improvement; at the peak operating point of 16000rpm, the motor using this solution has a 18.2% reduction in loss compared with the motor before improvement.

[0039] The first embodiment of this case:

[0040] like Figure 5-6 As shown, as an optional embodiment of the present case, the width of each conductor Sx-y in each stator slot S gradually widens from the slot S0 toward the direction away from the center of the stator core along the radial direction of the stator core.

[0041] It should be noted that, on the one hand, as the width of the wire Sx-y gradually widens, it helps the wire Sx-y to dissipate heat better, because the wider part of the wire Sx-y provides a larger surface area, thereby improving the heat dissipation performance of the motor; on the other hand, in some flat wire motors, insulating paper needs to be provided between the stator slot S and the wire Sx-y to ensure the insulation between the different-phase conductors and between the conductor and the stator core. By optimizing the shape of the wire Sx-y, the use of insulating materials can be reduced while ensuring the insulation performance, thereby reducing costs. Figure 8 As shown, since the wire Sx-y in this case is a flat wire conductor, the wire Sx-y of each layer in each stator slot S is actually a section of conductor, and the section of conductor is electrically connected to other corresponding conductors at the end of the motor stator, so that the size of the wire Sx-y in each stator slot S can be different.

[0042] like Figure 5-6 As shown, as an optional embodiment of the present case, the width of each stator slot S changes adaptively following the change of the width of the conductor Sx-y.

[0043] It should be noted that, since the width of each conductor Sx-y in each stator slot S gradually widens from the slot S0 toward the direction away from the center of the stator core along the radial direction of the stator core, by making the width of each stator slot S adapt to the change following the change in the width of the conductor Sx-y, the area of ​​the stator slot S can be increased without increasing the size of the stator core, so that more conductors Sx-y can be placed, thereby improving the filling rate of the conductor Sx-y, which is beneficial to improving the power density and efficiency of the motor.

[0044] like Figure 5-6 As shown, as an optional embodiment of the present case, in each of the stator slots S, at least the sum of the cross-sectional areas of the first conductor Sx-1 and the second conductor Sx-2 is less than or equal to the cross-sectional area of ​​the other single conductor Sx-y. Therefore, when there are only the first conductor Sx-1 and the second conductor Sx-2 and other conductors Sx-y, the cross-sectional area of ​​the first conductor Sx-1 and the second conductor Sx-2 is at most half of the cross-sectional area of ​​the other single conductor Sx-y, that is, the first conductor Sx-1 and the second conductor Sx-2 are two conductors Sx-y with smaller cross-sectional areas formed by optimizing and improving the original other conductor Sx-y, thereby effectively reducing the AC loss of the motor, especially the conductor AC loss in the high-speed area, and improving the motor efficiency and continuous performance; the number of conductors Sx-y in each stator slot S is only changed to N+1 on the basis of the original N conductors Sx-y, and the production process is simpler than the existing scheme; because the cross-sectional area of ​​the conductor close to the slot S0 is reduced to half of the original, and the heat generation is reduced, the continuous performance output capacity of the motor in the high-speed area is improved.

[0045] like Figure 5-6 As shown, as an optional embodiment of the present case, in each of the stator slots S, at least the cross-sectional areas of the first conductive wire Sx-1 and the second conductive wire Sx-2 are equal.

[0046] It should be noted that at least the first wire Sx-1, the second wire Sx-2, the third wire Sx-y, the fourth wire Sx-y or more wires Sx-y may have the same cross-sectional area; it should be understood that in order to simplify the number of windings, it is preferred that the wire Sx-y close to the slot S0 of the stator slot S has the same cross-sectional area as the first wire Sx-1 and the second wire Sx-2, so that the current and resistance of the first wire Sx-1 and the second wire Sx-2 can be equal, which helps to reduce energy loss, because excessive resistance will cause heat generation, thereby reducing the efficiency of the motor. The balanced resistance can ensure that the heat generated by the motor during operation is evenly distributed, avoiding local overheating, thereby improving the overall operating efficiency; at the same time, when the current and resistance in the winding are balanced, the winding aging caused by uneven heating can be reduced, thereby extending the service life of the motor; and the balance of current and resistance helps to provide a more uniform flux distribution, reducing flux harmonics, thereby reducing vibration and noise during motor operation; at the same time, the balanced winding design helps to improve the starting and operating performance of the motor, especially in applications that require smooth operation and low noise, such as high-performance motors.

[0047] like Figure 5-6 As shown, as an optional embodiment of the present case, in each of the stator slots S, at least the cross-sectional areas of the other wires Sx-y other than the first wire Sx-1 and the second wire Sx-2 are equal, which helps to reduce energy loss, improve the efficiency of the motor, and improve the starting and running performance of the motor.

[0048] like Figure 5-6 As shown, as an optional embodiment of the present case, the winding is a three-phase winding, and the windings of each phase are evenly spaced at an electrical angle of 120° in sequence along the circumference of the stator core.

[0049] It should be noted that when the scheme of this case is applied to a three-phase motor, when the stator winding of the three-phase motor is connected to three-phase alternating current, the electrical angle of each phase of electricity differs by 120°, which will generate a rotating magnetic field. This rotating magnetic field can effectively cut the rotor winding, thereby generating an induced current in the rotor winding and causing the motor to rotate. In this case, by continuously improving the uniformity of the winding distribution of the motor, such as alternating, spacing and staggered settings of windings of different phases, in terms of weakening the harmonics of the motor, the three-phase 120° staggered winding design helps to weaken the harmonic components in the air gap magnetic field, especially the 3kth harmonic magnetomotive force, which is beneficial to the vibration and noise reduction of the motor; in terms of improving the efficiency of the motor, by optimizing the layout of the winding, it is possible to reduce the energy loss caused by harmonics, especially the AC loss of the conductor Sx-y in the high speed area, thereby improving the efficiency and performance of the motor; in terms of stabilizing the operation of the motor, it helps to maintain the stability of the motor during operation.

[0050] The second embodiment of this case:

[0051] like Figure 6-8 As shown, as an optional embodiment of the present case, the two stator slots S constitute a stator slot set, and a preset number of other stator slots S are spaced between the two stator slots S in a stator slot set; in a stator slot set, the first wire Sx-1 in one stator slot S is connected to the second wire Sx-2 in another stator slot S to form a coil unit.

[0052] It should be noted that the stator slot set in this case includes a predetermined number of stator slots S, the stator slot group in this case includes a predetermined number of stator slot sets, and the stator slot group array in this case includes a predetermined number of stator slot groups. In this case, the number of stator slots S, the number of stator slot sets, the number of stator slot groups, the number of stator slot group arrays, and the number of windings in each phase are the same, and are evenly arranged along the circumferential direction of the stator core. The winding methods of all embodiments in the present case are mainly aimed at optimizing the winding methods of the wire Sx-y near the slot S0, for example, optimizing the winding methods of the first wire Sx-1 and the second wire Sx-2, and the stator slot set, stator slot group, and stator slot group array are all based on the description of the wire Sx-y near the slot S0 of the stator slot S, such as the description based on the winding methods of the first wire Sx-1 and the second wire Sx-2. In the present case, except for at least the first wire Sx-1 and the second wire Sx-2, the winding methods of other wires Sx-y are not summarized in detail in the present case, and the same winding method as in the present case or other winding methods can be selected according to actual needs.

[0053] Regarding the description of some drawings in the specification of this case, Figure 6S1-S48 in the figure represent the corresponding stator slots S respectively; in the figure, each stator slot S has six layers, and the cross-sectional area of ​​the wire Sx-y of the first layer and the second layer in each stator slot S is smaller than the cross-sectional area of ​​the wire Sx-y of other layers; Figure 7 The figure shows the connection mode of the first conductor Sx-1 and the second conductor Sx-2 in each stator slot group of each phase winding. Figure 6 and Figure 8 The connection mode in each stator slot S corresponds to; Figure 8 The figure shows the connection mode of the first wire Sx-1 and the second wire Sx-2 in the U-phase stator slot group array. A in the figure shows the connection schematic diagram of the first wire Sx-1 and the second wire Sx-2 in one stator slot group connected to form a winding unit. All B in the figure constitute a stator slot group. All C in the figure constitute another stator winding. D in the figure shows the connection schematic diagram of the first wire Sx-1 and the second wire Sx-2 in another stator slot group connected to form a winding unit. It should be understood that Figure 8 The lines A, B, D, and E in the figure do not represent the actual winding structure. The figure is only used to show the connection relationship of the conductors in each stator slot S. The actual winding structure diagram can be found in Fig. 9 , where U represents the U-phase winding, V represents the V-phase winding, and W represents the W-phase winding.

[0054] It should be noted that two of the stator slots S constitute a stator slot set. For example, in the U phase of this case, the two stator slots S in a stator slot set may be two stator slots S of S1 and S6, or two stator slots S of S13 and S18, or two stator slots S of S25 and S30, or two stator slots S of S37 and S42. In this example, a stator slot set is separated by four stator slots S. A preset number of other stator slots S are separated between two stator slots S in a stator slot set. For example, four stator slots S of S2, S3, S4 and S5 are separated between two stator slots S of S1 and S6 in the stator slot set; four stator slots S of S14, S15, S16 and S17 are separated between two stator slots S of S13 and S18 in the stator slot set. In a stator slot set, the first wire Sx-1 in one of the stator slots S is connected to the second wire Sx-2 in another of the stator slots S to form a coil unit. For example, in the two stator slots S of S1 and S6 in the stator slot set, the first wire S1-1 in the stator slot S1 is connected to the second wire S6-2 in the stator slot S6 to form a coil unit, and the first wire S6-1 in the stator slot S6 is connected to the second wire S1-2 in the stator slot S1 to form a coil unit. For another example, in the two stator slots S of S13 and S18 in the stator slot set, the first wire S13-1 in the stator slot S13 is connected to the second wire S18-2 in the stator slot S18 to form a coil unit, and the first wire S18-1 in the stator slot S18 is connected to the second wire S13-2 in the stator slot S13 to form a coil unit.

[0055] It should be noted that the motor in the prior art will generate additional heat and energy loss inside the motor due to the circulating current, which will reduce the efficiency of the motor. The circulating current may also cause additional pressure on the windings and other components of the motor, thereby shortening the service life of the equipment; at the same time, the circulating current will affect the operating stability of the motor, which may cause performance degradation or failure; in this case, the first wire Sx-1 in one of the stator slots S in a stator slot set is connected to the second wire Sx-2 in another stator slot S to form a coil unit, thereby forming a staggered connection, which can avoid or reduce the occurrence of circulating current, thereby avoiding or reducing additional losses and ensuring efficient and stable operation of the motor. In this case, the two stator slots S form a stator slot set, and a preset number of other stator slots S are spaced between the two stator slots S in the stator slot set. The winding of the same phase passes through the two stator slots S in the stator slot set in sequence, which can achieve a more uniform winding distribution, balance the force waves generated by the electromagnetic force between the motor rotor and the motor stator, thereby reducing the vibration and noise of the motor during operation. At the same time, a more uniform winding distribution helps to form a more regular and harmonious magnetic field distribution, which is beneficial to improving the efficiency and output power of the motor.

[0056] like Figure 6-8 As shown, as an optional embodiment of the present case, a plurality of stator slots evenly spaced along the axial direction of the stator core form a stator slot group, and the coil units in the same stator slot group are connected in series in sequence along the circumferential direction of the stator core to form a winding unit.

[0057] It should be noted that a plurality of stator slots uniformly spaced along the axial direction of the stator core constitute a stator slot group. For example, taking a three-phase 48-slot motor stator as an example, Figure 6-8 As shown, a plurality of stator slot sets (S1 and S6, S13 and S18, S25 and S30, S37 and S42) together constitute a stator slot group, and for another example, a stator slot set (S7 and S12, S19 and S24, S31 and S36, S43 and S48) together constitute another stator slot group. The coil units in the same stator slot group are sequentially connected in series along the circumferential direction of the stator core to form a winding unit. For example, the coil units in the stator slot group (S1 and S6, S13 and S18, S25 and S30, S37 and S42) are sequentially connected in series axially to form a winding unit (S1-1, S6-2, S13-1, S18-2, S25-1, S30-2, S37-1, S42-2), where S6-2 represents the second conductor Sx-y of the second layer of the sixth stator slot S. This solution can optimize the magnetic field distribution of the motor, reduce flux leakage, reduce resistance loss, and improve winding factors through a more precise winding layout, thereby improving the overall efficiency and performance output of the motor.

[0058] like Figure 6-8 As shown, as an optional embodiment of the present case, at least two of the stator slot groups form a stator slot group array, the stator slot sets of different stator slot groups in the same stator slot group array are alternately arranged along the circumferential direction of the stator core, and the current phases of the winding units in the same stator slot group array are consistent.

[0059] It should be noted that, for example, a plurality of stator slot sets (S1 and S6, S13 and S18, S25 and S30, S37 and S42) together constitute a first stator slot group, a plurality of stator slot sets (S7 and S12, S19 and S24, S31 and S36, S43 and S48) together constitute a second stator slot group, and the first stator slot group and the second stator slot group form a stator slot group array, such as Figure 8As shown, A in the figure represents a wiring schematic diagram of the first conductor Sx-1 and the second conductor Sx-2 in the second stator slot group connected to form a winding unit, all B in the figure constitute a stator slot group, such as the above-mentioned second stator winding, all C in the figure constitute another stator winding, such as the above-mentioned first stator winding, and D in the figure represents a wiring schematic diagram of the first conductor Sx-1 and the second conductor Sx-2 in the first stator slot group connected to form a winding unit, wherein the first stator slot group and the second stator slot group can form a stator slot group array, such as a stator slot group array of a U-phase winding. The stator slot sets of different stator slot groups in the same stator slot group array are alternately arranged along the circumference of the stator core, such as Figure 8 As shown, for example, multiple stator slot sets in the first stator slot group (S1 and S6, S13 and S18, S25 and S30, S37 and S42) and multiple stator slot sets in the second stator slot group (S7 and S12, S19 and S24, S31 and S36, S43 and S48) are arranged alternately in the circumferential direction. The current phases of the winding units in the same stator slot group array are consistent, for example, winding units (S1-1, S6-2, S13-1, S18-2, S25-1, S30-2, S37-1, S42-2), winding units (S1-2, S6-1, S13-2, S18-1, S25-2, S30-1, S37-2, S42-1), winding units (S7-1, S12-2, S19-1, S24-2, S31 -1, S36-2, S43-1, S48-2), winding units (S7-2, S12-1, S19-2, S24-1, S31-2, S36-1, S43-2, S48-1) are all U-phase windings in the windings, that is, the windings in each stator slot group array are windings of the same phase. By accurately laying out the stator slot sets in the stator slot group array, the accurate layout of the windings of the same phase is achieved, which is beneficial to improving the overall efficiency and performance output of the motor.

[0060] like Figure 6-8 As shown, as an optional embodiment of the present case, at least three stator slot groups are staggered along the circumferential direction of the stator core, and the current phases of the winding units in different stator slot groups are different.

[0061] It should be noted that the stator slot set of the U phase (S1 and S6, S13 and S18, S25 and S30, S37 and S42) together constitute a stator slot group, the stator slot set of the V phase (S4 and S9, S16 and S21, S28 and S33, S40 and S47) together constitute a stator slot group, and the stator slot set of the W phase (S9 and S14, S21 and S26, S33 and S38, S45 and S2) together constitute a stator slot group. The stator slot group of the U phase, the stator slot group of the V phase and the stator slot group of the W phase are staggered along the axial direction of the stator core. For details, see Figure 6 As shown, the current phases of the winding units in different stator slot groups are also different, thereby achieving a more uniform winding distribution, helping to form a more regular and harmonious magnetic field distribution, and being beneficial to improving the efficiency and output power of the motor.

[0062] like Figure 6-8 As shown, as an optional embodiment of the present case, any stator slot S of any of the stator slot groups is located between two stator slots S of one of the stator slot sets of the other stator slot groups.

[0063] It should be noted that, for example, in the U phase, the stator slot group composed of multiple stator slot sets (S1 and S6, S13 and S18, S25 and S30, S37 and S42), other stator slot groups, multiple stator slot sets of the stator slot group (S9 and S14, S21 and S26, S33 and S38, S45 and S2), wherein the stator slot S1 is located between the stator slot sets (S45 and S2) of the stator slot group. For another example, the stator slot S6 is located between the stator slot sets (S4 and S9) of other stator slot groups and between the stator slot sets (S5 and S10), thereby achieving a more uniform winding distribution, helping to form a more regular and harmonious magnetic field distribution, and helping to improve the efficiency and output power of the motor.

[0064] The third embodiment of this case:

[0065] This embodiment is completely different from the above-mentioned second embodiment. Specifically, in the same stator slot S, the first conductor Sx-1 and the second conductor Sx-2 are electrically connected at both ends of the stator core, and the first conductor Sx-1 and the second conductor Sx-2 both have a complete insulation coating.

[0066] It should be noted that if the first wire Sx-1 and the second wire Sx-2 are short-circuited at both ends of the stator core by welding, the length of the short-circuit is based on the actual use requirements, and the principle is to save materials as much as possible, and the connection needs to be firm. When the motor is at high speed, the skin effect will cause the current to be mainly concentrated on the surface of the wire Sx-y, resulting in uneven current density, thereby generating additional losses and temperature rise. In order to solve this problem, measures need to be taken to increase the surface area of ​​the wire Sx-y, thereby reducing the current density and reducing the skin effect. In this solution, since the first wire Sx-1 and the second wire Sx-2 are electrically connected at both ends of the stator core, and the first wire Sx-1 and the second wire Sx-2 both have a complete insulating coating, so that the first wire Sx-1 and the second wire Sx-2 are actually one wire Sx-y. This wiring method not only increases the surface area of ​​the wire Sx-y, but also makes the current distribution in the first wire Sx-1 and the second wire Sx-2 more uniform, thereby effectively reducing the skin effect and reducing the loss caused by uneven current density. In the above-mentioned second embodiment, the first conductor Sx-1 and the second conductor Sx-2 in each stator slot S are independent flat conductors rather than the same flat conductor Sx-y. Although the surface area of ​​the conductor Sx-y of the winding is increased, since the first conductor Sx-1 and the second conductor Sx-2 in the same stator slot S are independent, the uniformity of current distribution between adjacent flat conductors Sx-y cannot be fully utilized. Therefore, when the winding method and other structures in the second and third embodiments are the same, at high speeds, the effect of the second embodiment in reducing the skin effect will not be as good as the effect of the third embodiment.

[0067] The fourth embodiment of this case:

[0068] The utility model also provides a motor, comprising the motor stator, so that the motor with the motor stator is also within the protection scope of this case.

[0069] The utility model also provides a vehicle, including the motor, so that the vehicle with the motor is also within the protection scope of this case, such as a new energy vehicle.

[0070] In summary, the utility model effectively overcomes some practical problems in the prior art and thus has high utilization value and use significance.

[0071] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the technology may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed in the present invention shall still be covered by the claims of the present invention.

Claims

1. A motor stator, characterized in that: include: A stator core having a plurality of stator slots arranged in a circumferential direction, wherein the stator slots include a notch near the center of the stator core; The winding comprises a plurality of conductors arranged in the stator slots along the radial direction of the stator core, wherein at least the first conductor and the second conductor have a cross-sectional area smaller than the cross-sectional area of ​​the other conductors, wherein the first conductor and the second conductor are two conductors continuously arranged in the direction away from the center of the stator core from the slot.

2. The motor stator according to claim 1, characterized in that: The width of each conductor in each stator slot gradually widens from the slot opening toward a direction away from the center of the stator core along the radial direction of the stator core.

3. The motor stator according to claim 2, characterized in that: The width of each stator slot changes adaptively following the change of the wire width.

4. The motor stator according to claim 1, characterized in that: In each of the stator slots, at least the sum of the cross-sectional areas of the first conductor and the second conductor is less than or equal to the cross-sectional area of ​​any other single conductor.

5. The motor stator according to claim 2, characterized in that: In each of the stator slots, at least the first conductive wire and the second conductive wire have equal cross-sectional areas.

6. The motor stator according to claim 2, characterized in that: In each of the stator slots, at least the first conductive wire and the conductive wires other than the second conductive wire have the same cross-sectional area.

7. The motor stator according to claim 1, characterized in that: In the same stator slot, the first conductive wire and the second conductive wire are electrically connected at both ends of the stator core, and both the first conductive wire and the second conductive wire have complete insulation coatings.

8. The motor stator according to claim 1, characterized in that: The winding is a three-phase winding, and the windings of each phase are evenly spaced at an electrical angle of 120° in sequence along the circumferential direction of the stator core.

9. A motor, characterized in that: The motor stator comprises the motor stator as described in any one of claims 1 to 8.

10. A vehicle, characterized in that: A motor comprising the motor described in claim 9.

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