Motor stator and motor
By optimizing the wire winding method in the flat wire motor stator, especially the reduction in wire thickness and misaligned connection design near the notch, the motor circulation problem is solved and the motor efficiency and stability is improved.
Patent Information
- Application Number
- CN202420810372.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-18
- Publication Date
- 2025-04-11
- Estimated Expiration
- 2034-04-18
AI Technical Summary
In flat wire motors, if the wires are not evenly wired, it is easy to cause motor circulation problems, increase heat and energy losses, and reduce motor efficiency.
By optimizing the conductor winding method of the motor stator, specific measures include arranging a plurality of conductors radially in the stator slot, wherein the first and second conductors close to the notch are less thick than other conductors, forming a dislocation connection to avoid circulation.
It effectively suppresses the AC loss of the motor in the high-speed area, improves the working efficiency of the motor, and ensures the efficient and stable operation of the motor.
Smart Images
Figure CN222750220U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of motors, and in particular to a motor stator and a motor. 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] However, in flat wire motors, if the wires near the stator slots cannot be laid out more evenly, it will easily lead to motor circulating current problems. The circulating current will generate additional heat and energy loss inside the motor, thereby reducing the motor's operating efficiency. Utility Model Content
[0004] In view of the above shortcomings of the prior art, an object of the present invention is to provide a motor stator and a motor, which can avoid or reduce motor losses and improve motor working efficiency by optimizing the winding method of at least part of the wires of the motor stator.
[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] A winding, the winding comprising a plurality of wires arranged in the stator slots along the radial direction of the stator core, wherein at least a first wire and a second wire of each of the wires have a thickness smaller than that of the other wires, wherein the first wire and the second wire are two wires arranged continuously in a direction away from the center of the stator core from the slot;
[0008] The two stator slots constitute a stator slot set, and a preset number of other stator slots are spaced between the two stator slots in one stator slot set;
[0009] In one of the stator slot sets, the first conductive wire in one of the stator slots is connected to the second conductive wire in another of the stator slots to form a coil unit.
[0010] In an optional embodiment of the utility model, 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.
[0011] In an optional embodiment of the utility model, 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.
[0012] In an optional embodiment of the present invention, at least three of the stator slot groups are staggeredly arranged along the circumference of the stator core, and the current phases of the winding units in different stator slot groups are different.
[0013] In an optional embodiment of the present invention, any stator slot of any of the stator slot groups is located between two stator slots of one of the stator slot sets of the other stator slot groups.
[0014] In an optional embodiment of the present invention, among the multiple wires in each of the stator slots, the sum of the thicknesses of at least the first wire and the second wire is less than or equal to the thicknesses of the other wires.
[0015] In an optional embodiment of the present invention, among the multiple wires in each of the stator slots, the widths of the first wire and the second wire along the circumferential direction of the stator slot are equal to the widths of the other wires.
[0016] In an optional embodiment of the present invention, at least three of the stator slot group arrays are staggeredly arranged along the circumference of the stator core, and the current phases of the winding units in different stator slot group arrays are different.
[0017] In an optional embodiment of the present invention, the three stator slot group arrays are staggered in pairs, and two adjacent stator slot group arrays are staggered by two stator slots.
[0018] In order to achieve the above-mentioned purpose and other related purposes, the utility model provides a motor, including the motor stator.
[0019] In summary, the utility model improves the full slot rate of the motor by using flat wire windings; further reduces the thickness of part of the flat wire, such as further reducing the thickness of the flat wire near the slot, thereby suppressing the AC loss of the motor in the high speed area, thereby improving the working efficiency of the motor; optimizes the winding layout of the first wire and the second wire, such as optimizing the winding layout of the first wire and the second wire near the slot, such as connecting the first wire in one of the stator slots in a stator slot set with the second wire in another stator slot to form a coil unit, thereby forming a uniform alternating and staggered connection, which can further avoid or reduce the occurrence of circulating current, thereby reducing additional losses, thereby ensuring efficient and stable operation of the motor. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] 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.
[0021] Figure 1 It is a schematic diagram of the partial structure of the motor stator in one embodiment of the utility model;
[0022] Figure 2 This is a cross-sectional view of the complete structure of the motor stator in one embodiment of the utility model;
[0023] Figure 3 A schematic diagram of the wire connection of each phase winding in an embodiment of the utility model;
[0024] Figure 4 It is a schematic diagram of the wire connection of one phase in an embodiment of the utility model;
[0025] Figure 5 This is a schematic diagram of the motor stator structure before improvement in this case;
[0026] Figure 6 This is a schematic diagram of the improved motor stator structure in this case;
[0027] Figure 7 This is a comparison chart of motor losses before and after the motor stator is improved in this case;
[0028] Figure 8 Schematic diagram of the stator structure of a motor in an embodiment of the present case;
[0029] 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
[0030] 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.
[0031] See also Figures 1 to 8 It 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.
[0032] All technical and scientific terms used in the present invention are consistent with the prior art mastery of the technicians in this technical field and the records of the present invention. The present invention can also be implemented by using any methods, equipment and materials of the prior art that are similar or equivalent to the methods, equipment and materials in the embodiments of the present invention.
[0033] In this case, it should be noted that 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 greater the radial thickness 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:
[0034]
[0035] Where: 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.
[0036] Regarding the description of some drawings in the specification of this case, Figure 1 It is a partial structural diagram of the stator core, which shows the structure of the stator core in this case in detail; Figure 2 S1-S48 in the figure represent the corresponding stator slots S respectively; in the figure, each stator slot S has six layers, and the thickness of the wire Sx-y of the first layer and the second layer in each stator slot S is less than the thickness of the wire Sx-y of other layers; Figure 3 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 2 and Figure 4 The connection mode in each stator slot S corresponds to; Figure 4 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 4The 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 Figure 8 , where U represents the U-phase winding, V represents the V-phase winding, and W represents the W-phase winding.
[0037] like Figure 1-3 As shown, the utility model provides a motor stator, including a stator core and a winding; the stator core is circumferentially provided with a plurality of stator slots S, and the stator slots S include a slot S0 close to the center of the stator core;
[0038] The winding includes a plurality of wires Sx-y arranged in the stator slot S along the radial direction of the stator core, and at least the thickness of the first wire Sx-1 and the second wire Sx-2 in each of the wires Sx-y is less than the thickness of the other wires Sx-y, wherein the first wire Sx-1 and the second wire Sx-2 are two 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 may be two wires Sx-y arranged 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 arranged closest to the slot S0. Of course, according to actual needs, the first wire Sx-1 and the second wire Sx-2 may also be two wires Sx-y arranged 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 may also be arranged farthest from the slot S0.
[0039] 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.
[0040] It should be noted that the stator slot set in this case is a stator slot S containing a predetermined number of stator slots, the stator slot group in this case is a stator slot set containing a predetermined number of stator slots, and the stator slot group array in this case is a stator slot group containing a predetermined number of stator slots. The winding winding methods of all embodiments in this case are mainly aimed at optimizing the winding method of the wire Sx-y near the slot S0, such as optimizing the winding method 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 based on the description of the winding method of the first wire Sx-1 and the second wire Sx-2. In this case, except for at least the first wire Sx-1 and the second wire Sx-2, the methods of other wires Sx-y are not summarized in detail in this case. According to actual needs, the same winding method as in this case or other winding methods can be selected.
[0041] 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.
[0042] It should be noted that the stator core is in a ring shape, and the stator core in the ring shape is evenly provided with a plurality of stator slots S in the circumferential direction; this case mainly discusses the three-phase motor as an example, and the wire Sx-y described in this case is mainly for flat wire wire, and this case mainly describes the winding method of the first wire Sx-1 and the second wire Sx-2. It should be understood that this case is also applicable to motors of other phases according to actual needs, and the number of stator slots S, the number of stator slot sets, the number of stator slot groups, the stator slot group arrays, and the number of windings of each phase in this case are the same, and are evenly arranged along the circumference of the stator core. In the present 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 thickness direction of the conductor Sx-y is the direction from the stator slot S to 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 thickness of the first conductor Sx-1 and the second conductor Sx-2 is less than the thickness of the other conductors Sx-y, wherein the first conductor Sx-1 and the second conductor Sx-2 are two conductors Sx-y arranged in sequence close to the slot S0 and from the slot S0 to the direction away from the center of the stator core, and according to actual needs, there may also be a third conductor Sx-3, a fourth conductor Sx-4 and more conductors Sx-y, and the thickness of the third conductor Sx-3, the fourth conductor Sx-4 and more conductors Sx-y is less than the thickness of the other conductors Sx-y, and the other conductors Sx-y here do not include the first conductor Sx-1, the second conductor Sx-2, the first conductor Sx-1, the second conductor Sx-2, the second conductor Sx-2, the second conductor Sx-3, the second conductor Sx-4 and the second conductor Sx-2. Three conductors Sx-3, a fourth conductor Sx-4 and more conductors Sx-y, and 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 other conductors Sx-y, which also indicates that the total number of the first conductor Sx-1, the second conductor Sx-2 and more conductors Sx-y in each stator slot S is less than the total number of conductors Sx-y in each stator slot S, that is, there must be at least one conductor Sx-y whose thickness is greater than the thickness of the first conductor Sx-1 and the second conductor Sx-2 and more conductors Sx-y that are the same as the first conductor Sx-1 and the second conductor Sx-2; the first conductor Sx-1, the second conductor Sx-2, the third conductor Sx-3, the fourth conductor Sx-4 and more conductors Sx-y are conductors Sx-y that are close to the slot S0 and are arranged in sequence from the slot S0 to the direction away from the center of the stator core, among which the first conductor Sx-1 is arranged closest to the slot S0.
[0043] It should be further explained that, compared with the traditional round wire motor, the flat wire motor has a higher slot fill rate, a smaller winding DC resistance, and a higher motor efficiency, and thus has been widely used in electric vehicles; however, when 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; therefore, in this case, the thickness of the conductor Sx-y close to the slot S0 is reduced, such as reducing the thickness of the first conductor Sx-1 and the second conductor Sx-2, so as to suppress the AC loss of the motor in the high speed area. It should be understood that the third conductor Sx-y close to the slot S0 in the conductor Sx-y can also be reduced. The thickness of the first conductor Sx-3 and the fourth conductor Sx-4 is reduced, but it should be noted that the more the conductors Sx-y whose thickness is reduced, the better, because too many conductors Sx-y whose thickness is reduced will also cause the DC resistance of the flat wire motor to become larger, and will also reduce the motor efficiency. In addition, since the thickness of the conductor Sx-y is reduced, the number of layers of the conductor Sx-y increases, which will also increase the complexity of the production process. Therefore, in this case, the thickness of the first conductor Sx-1 and the second conductor Sx-2 near the slot S0 is preferably reduced, but it should be understood that for motors of different powers, the number of conductors 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 is selected.
[0044] like Figure 7 As shown in FIG. 1 , it is a comparison diagram of AC loss before and after the improvement of the motor stator in this case, where M represents the existing scheme before the improvement of this case, and the specific structure of the motor stator is as follows: Figure 5 As shown; N represents the improved scheme of this case, the specific structure of the motor stator is as follows Figure 6 As shown, when other structures and winding methods remain the same, the motor loss comparison results show that at the 4000rpm peak operating point, the motor using the present solution has a 2.2% reduction in loss compared to the motor before improvement; at the 16000rpm peak operating point, the motor using the present solution has a 18.2% reduction in loss compared to the motor before improvement.
[0045] In this case, two 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, S1 and S6, or two stator slots S, S13 and S18, or two stator slots S, S25 and S30, or two stator slots S, S37 and S42. In this example, there are four stator slots S in a stator slot set. A preset number of other stator slots S are spaced between two stator slots S in a stator slot set. For example, there are four stator slots S, S2, S3, S4 and S5, between two stator slots S, S1 and S6 in the stator slot set; there are four stator slots S, S14, S15, S16 and S17, between two stator slots S, 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.
[0046] 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.
[0047] Since the conductor Sx-y in this case is a flat wire, it can improve the full slot rate, thereby increasing the power output of the motor. Compared with traditional round conductors, the use of flat conductors and their layered layout in the stator slots S can simplify the manufacturing process, especially in automated production, which helps to improve production efficiency and reduce costs.
[0048] like Figure 1-3 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.
[0049] 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 3-4 It can be seen that 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.
[0050] like Figure 2-4 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.
[0051] 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 4 As 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 4 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.
[0052] like Figure 2-4 As an optional embodiment of the present case, at least three of the stator slot groups are staggered along the circumference of the stator core, and the current phases of the winding units in different stator slot groups are different.
[0053] 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 2 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.
[0054] like Figure 2-4 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.
[0055] 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.
[0056] like Figure 2-4 As shown, as an optional embodiment of the present case, among the multiple wires Sx-y in each of the stator slots S, the sum of the thicknesses of at least the first wire Sx-1 and the second wire Sx-2 is less than or equal to the thickness of the other wires Sx-y.
[0057] It should be noted that, for example, the sum of the thickness of at least the first wire Sx-1, the second wire Sx-2, the third wire Sx-3, the fourth wire Sx-4 or more wires Sx-y may be less than or equal to the thickness of other wires Sx-y, and 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 similar wires Sx-y. By reducing the thickness of the wire Sx-y at the slot S0 close to the stator core, the AC loss caused by the skin effect and the proximity effect under the AC magnetic field can be significantly reduced, thereby improving the working efficiency of the motor.
[0058] like Figure 2 As shown, as an optional embodiment of the present case, among the multiple wires Sx-y in each of the stator slots S, the widths of the first wire Sx-1 and the second wire Sx-2 along the circumferential direction of the stator slot S are equal to the widths of the other wires Sx-y.
[0059] It should be noted that by making the width of the first conductor Sx-1 and the second conductor Sx-2 along the circumferential direction of the stator slot S equal to the width of other conductors Sx-y, the specifications of all conductors Sx-y are more consistent, which is more convenient for processing and production and reduces costs; at the same time, it is also convenient to increase the full slot rate in the stator slot S.
[0060] like Figure 2-4 As shown, as an optional embodiment of the present case, it is characterized in that at least three stator slot group arrays are staggered along the circumference of the stator core, and the current phases of the winding units in different stator slot group arrays are different.
[0061] It should be noted that each stator slot group array belongs to one phase, and the three stator slot group arrays are respectively U, V and W phases. Since at least three stator slot groups are staggered along the circumference of the stator core, the current phases of the winding units in different stator slot groups are different, so that the stator slot groups in each phase are staggered along the circumference of the stator core, and the stator slot group array is composed of multiple stator slot groups. Therefore, there are at least three stator slot group arrays staggered along the circumference of the stator core, and the current phases of the winding units in the different stator slot group arrays are different, 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.
[0062] like Figure 2-4 As shown, as an optional embodiment of the present case, the three stator slot group arrays are staggered in pairs, and two adjacent stator slot group arrays are staggered by two stator slots S.
[0063] It should be noted that, for a three-phase motor, the three-phase motor includes three stator slot group arrays, and the three stator slot group arrays are staggered in pairs, such as three stator slot group arrays of U phase, V phase and W phase; two adjacent stator slot group arrays are staggered by two stator slots S, for example, each stator slot set in the stator slot group array of U phase is separated by four stator slots S, two of the four stator slots S are stator slots S in the stator slot group array of V phase, and the other two are stator slots S in the stator slot group array of W phase, so that two adjacent stator slot group arrays are staggered by two stator slots S, thereby achieving a more uniform winding distribution, which helps to form a more regular and harmonious magnetic field distribution, and is beneficial to improving the efficiency and output power of the motor.
[0064] like Figure 8 As shown, the utility model provides a motor, including the motor stator. By making the motor have the motor stator described above, the motor is also within the protection scope of this case.
[0065] When the solution 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 motor winding distribution, such as alternating, spacing and staggered settings of different phase windings, in terms of weakening the motor harmonics, 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 motor efficiency, by optimizing the layout of the windings, the energy loss caused by harmonics can be reduced, especially the Sx-y AC loss of the conductor 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.
[0066] In summary, the utility model effectively overcomes some practical problems in the prior art and thus has high utilization value and use significance.
[0067] 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; A winding, the winding comprising a plurality of wires arranged in the stator slots along the radial direction of the stator core, wherein at least the first wire and the second wire of each of the wires have a thickness smaller than that of the other wires, wherein the first wire and the second wire are two wires arranged continuously in a direction away from the center of the stator core at the slots; The two stator slots constitute a stator slot set, and a preset number of other stator slots are spaced between the two stator slots in one stator slot set; In one of the stator slot sets, the first conductive wire in one of the stator slots is connected to the second conductive wire in another of the stator slots to form a coil unit.
2. The motor stator according to claim 1, characterized in that: A plurality of stator slots evenly spaced apart along the axial direction of the stator core form a stator slot group, and 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.
3. The motor stator according to claim 2, characterized in that: 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.
4. The motor stator according to claim 2, characterized in that: At least three of the stator slot groups are staggeredly arranged along the circumferential direction of the stator core, and current phases of the winding units in different stator slot groups are different.
5. The motor stator according to claim 4, characterized in that: Any stator slot of any of the stator slot groups is located between two stator slots of one of the stator slot sets of the other stator slot groups.
6. The motor stator according to claim 1, characterized in that: Among the multiple wires in each of the stator slots, at least the sum of the thicknesses of the first wire and the second wire is less than or equal to the thicknesses of the other wires.
7. The motor stator according to claim 1, characterized in that: Among the multiple conductive wires in each stator slot, the width of the first conductive wire and the second conductive wire along the circumferential direction of the stator slot is equal to the width of other conductive wires.
8. The motor stator according to claim 3, characterized in that: At least three of the stator slot group arrays are staggeredly arranged along the circumferential direction of the stator core, and the current phases of the winding units in different stator slot group arrays are different.
9. The motor stator according to claim 3, characterized in that: The three stator slot group arrays are staggered in pairs, and two adjacent stator slot group arrays are staggered by two stator slots.
10. A motor, characterized in that: The motor stator comprises the motor stator as described in any one of claims 1 to 9.