Electric machine stator and electric machine comprising same

Abstract

The application discloses a motor stator and a motor comprising the same. The motor stator comprises a stator core and two winding skeletons arranged on two sides of the stator core. Positioning protrusions of the winding skeletons are arranged in pairs and are located in regions corresponding to the stator teeth and are matched with the two side surfaces of the stator teeth. In the structure, the stator core only needs to be slotted on the two sides of the stator teeth to match the positioning protrusions, the slotting area is reduced, the slotting position is limited to the two sides of the stator teeth, and the influence on the stator tooth width, yoke thickness and electromagnetic performance of the motor is reduced. Meanwhile, the sum of the number of the positioning protrusions of the two winding skeletons is less than or equal to the number of the stator teeth, so that the influence on the stator structure caused by too many protrusions is avoided; and the positioning protrusions of the two winding skeletons correspond to different phase stator teeth of a multi-phase motor or different stator teeth of a single-phase motor respectively, so that the balance of the voltages of the phases of the multi-phase motor is ensured and local saturation of a single stator tooth caused by the cooperation of the single stator tooth with the two side protrusions is prevented.

Description

Technical Field

[0001] This invention relates to the field of motor technology, and in particular to a motor stator and a motor comprising the stator. Background Technology

[0002] Fractional-slot concentrated winding permanent magnet motors are widely used in household appliances, wind power generation, and rail transportation due to their advantages such as high efficiency, high power density, and high power factor. The stator of this motor consists of stator windings, a stator core, winding bobbins, insulating paper, and lead crimp terminals. The winding bobbins are made of non-magnetic insulating material. By mounting the winding bobbins on both axial ends of the stator core, and in conjunction with the insulating paper inserted into the stator slots, they form the main insulation, working together to isolate the current flowing from the stator windings wound on the stator teeth and the stator core.

[0003] The existing main insulation scheme, consisting of a winding bobbin and insulating paper, can be found in Chinese patent CN211880200U. To assemble the winding bobbin and stator core, several annular positioning protrusions are set on the winding bobbin. These protrusions correspond to the stator slots in the stator core. By embedding these protrusions into the stator slots at both ends of the stator core along the axial direction, the winding bobbin and stator core are positioned and installed. To ensure the mechanical strength of the winding bobbin, the thickness of the embedded positioning protrusions is typically 0.5mm-0.8mm, and the height of the embedded portion is 3mm-4mm. Due to the embedding of the positioning protrusions, the stator slots at both ends of the stator core along the axial direction are larger. Therefore, the stator tooth width and stator yoke thickness at both ends of the stator core along the axial direction are reduced, resulting in a reduction in the equivalent stator tooth width and stator yoke thickness of the entire motor. For permanent magnet motors with stator cores close to saturation during rated operation, this positioning scheme will increase the magnetic voltage drop of the motor stator core, resulting in a reduction in the effective air gap magnetic voltage drop and a decrease in the electromagnetic performance of the motor. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the defects in the prior art and provide a motor stator and a motor including the stator.

[0005] The present invention solves the above-mentioned technical problems through the following technical solution:

[0006] An electric motor stator, comprising:

[0007] Stator core;

[0008] Two winding frames are respectively located on both sides of the stator core. Each winding frame has a positioning protrusion that protrudes from the surface of the frame body along the axial direction of the motor stator. The positioning protrusions are arranged in pairs and are only located in the area of ​​the frame body corresponding to the stator teeth of the stator core. The paired positioning protrusions are positioned in conjunction with the two side surfaces of the corresponding stator teeth.

[0009] Wherein, the sum of the number of the positioning protrusions of the two winding frames is less than or equal to the number of stator teeth of the stator core, and the positioning protrusions of the two winding frames are respectively positioned on the stator teeth of different phases or on different stator teeth.

[0010] The positioning protrusions on the winding skeleton of this motor are only positioned in the stator tooth area of ​​the stator core. By engaging with the two side surfaces of the stator teeth, the stator core only needs to be slotted on both sides of the stator teeth to mate with the positioning protrusions, eliminating the need for slotting in other areas of the stator slots. This reduces the area of ​​the stator core's grooves, and since the slotting is only located on the two side surfaces of the stator teeth, it minimizes the impact of the winding skeleton embedding into the stator core on the axial width of the stator teeth and the yoke thickness, thus reducing the impact on the motor's electromagnetic performance. Specifically, for multi-phase motors, the positioning protrusions of the two winding skeletons are positioned on stator teeth of different phases; for single-phase motors, the positioning protrusions of the two winding skeletons are positioned on different stator teeth. This ensures voltage balance across phases in multi-phase motors and prevents localized saturation caused by a single stator tooth engaging with the side protrusions.

[0011] Meanwhile, with the winding frames on both sides cooperating with the stator core, the sum of the number of positioning protrusions of the two winding frames is less than or equal to the number of stator teeth of the stator core, so as to control the number of the two winding frames and avoid excessive number of positioning protrusions, which would reduce the impact of the winding frames' embedding on the stator tooth width and yoke thickness at both ends of the stator core in the axial direction.

[0012] In addition, the positioning protrusions of the two winding frames are positioned on stator teeth of different phases (for multi-phase motors) or on different stator teeth (for single-phase motors), so that a single stator tooth of the stator core can only cooperate with the positioning protrusion of one winding frame at most, thus avoiding the positioning protrusions of both frames from being simultaneously embedded in a single stator tooth, which would cause local saturation at that stator tooth.

[0013] Preferably, the positioning protrusions of the two winding frames are alternately distributed in the circumferential direction of the motor stator;

[0014] And / or, in the circumferential direction of the motor stator, the positioning protrusions are spaced apart on the winding frame;

[0015] And / or, the sum of the number of the positioning protrusions of the two winding frames is less than the number of stator teeth of the stator core.

[0016] By alternating the distribution of positioning protrusions on the two winding frames along the circumferential direction of the motor stator, the voltage balance of each phase can be ensured. Furthermore, this avoids localized saturation of the stator core caused by the concentration of positioning protrusions in specific areas of the winding frames.

[0017] By ensuring that the sum of the number of positioning protrusions on the two winding frames is less than the number of stator teeth on the stator core, the number of the two winding frames can be further controlled, thus avoiding an excessive number of positioning protrusions and reducing the impact of the winding frames' embedding on the stator tooth width and yoke thickness at both ends of the stator core.

[0018] Preferably, the motor stator is a multi-phase winding motor stator, wherein the positioning protrusion of one winding frame is positioned on the stator teeth of the odd-numbered phases, and the positioning protrusion of the other winding frame is positioned on the stator teeth of the even-numbered phases.

[0019] For a multi-phase winding motor stator, the positioning protrusions of one winding frame are configured to correspond to the stator teeth of the odd-numbered phases, while the positioning protrusions of the other winding frame are configured to correspond to the stator teeth of the even-numbered phases, in order to achieve voltage balance among the phases of the motor and thus ensure stable motor operation.

[0020] Preferably, the positioning protrusion of one of the winding frames is positioned on all or part of the stator teeth of the odd-numbered phases;

[0021] And / or, the positioning protrusion of another winding frame is positioned on all or part of the stator teeth of an even-numbered phase.

[0022] Preferably, the positioning protrusion of one of the winding skeletons is positioned on a single stator tooth corresponding to each of the odd-numbered phases (meaning that each odd-numbered phase corresponds to a positioning tooth with a groove).

[0023] And / or, the positioning protrusion of another winding frame is positioned on a single stator tooth corresponding to an even-numbered phase.

[0024] Preferably, the motor stator is a single-phase winding motor stator, wherein the positioning protrusion of one winding frame is positioned on the stator tooth numbered odd, and the positioning protrusion of the other winding frame is positioned on the stator tooth numbered even.

[0025] For a single-phase winding motor stator, the positioning protrusions of one winding frame are set to correspond to the stator teeth numbered odd, while the positioning protrusions of the other winding frame are set to correspond to the stator teeth numbered even. This achieves a reasonable layout of the positioning protrusions of the two winding frames, making the structures of the two winding frames located on both sides of the stator core roughly the same, which can improve the operating stability of the motor stator.

[0026] Preferably, one of the positioning protrusions of the winding frame is positioned on one of the stator teeth numbered odd-numbered;

[0027] And / or, the positioning protrusion of another winding frame is positioned on one of the stator teeth numbered evenly.

[0028] Preferably, positioning grooves are provided on both sides of the stator teeth, the positioning grooves being used to accommodate the positioning protrusions and to engage with the positioning protrusions for positioning.

[0029] By setting positioning grooves on both sides of the stator teeth to accommodate and position the positioning protrusions of the winding bobbin, the positioning effect between the winding bobbin and the stator core can be improved.

[0030] Preferably, the outer surface of the positioning protrusion within the positioning groove is flush with the two side surfaces of the stator tooth.

[0031] By positioning the outer surface of the protrusion flush with the two side surfaces of the stator teeth, the space can be used to make reasonable structural layout.

[0032] Preferably, the positioning protrusion is positioned in the middle of the stator teeth along the axial direction of the motor stator.

[0033] And / or, in the circumferential direction of the motor stator, the thickness w of the positioning protrusion ranges from 0.5mm to 1mm;

[0034] And / or, along the axial direction of the motor stator, the depth h of the positioning protrusion ranges from 3mm to 4mm;

[0035] And / or, in the radial direction of the motor stator, the length l of the positioning protrusion is less than the tooth height of the stator tooth;

[0036] And / or, the positioning protrusion is rectangular in shape.

[0037] By positioning the locating protrusions along the axial direction of the motor stator to correspond to the middle position of the stator teeth, the positioning effect of the locating protrusions on the stator teeth can be improved.

[0038] By limiting the length l of the positioning protrusion, the impact of winding embedding on the electromagnetic performance of the motor can be further reduced.

[0039] The present invention also provides an electric motor, which includes the motor stator as described above.

[0040] The positive and progressive effects of this invention are as follows: the positioning protrusions of the winding frame of the motor stator are only set in the stator tooth area of ​​the stator core. By positioning the stator core in cooperation with the two side surfaces of the stator teeth, the stator core only needs to be slotted on both sides of the stator teeth to cooperate with the positioning protrusions of the winding frame for installation. There is no need to slot in other areas of the stator slot, which can reduce the area of ​​the groove of the stator core. Moreover, the slots that need to be slotted are only located on the two side surfaces of the stator teeth. This can reduce the impact of the winding frame being embedded in the stator core on the width of the stator teeth and the yoke thickness at both ends of the stator core in the axial direction, thereby reducing the impact on the electromagnetic performance of the motor.

[0041] Meanwhile, with the winding frames on both sides cooperating with the stator core, the sum of the number of positioning protrusions of the two winding frames is less than or equal to the number of stator teeth of the stator core, so as to control the number of the two winding frames and avoid excessive number of positioning protrusions, which would reduce the impact of the winding frames' embedding on the stator tooth width and yoke thickness at both ends of the stator core in the axial direction.

[0042] Furthermore, the positioning protrusions of the two winding frames are positioned on stator teeth of different phases (for multi-phase motors) to ensure voltage balance across all phases of the motor. Additionally, a single stator tooth of the stator core engages with at most one positioning protrusion of a winding frame to prevent the positioning protrusions of both frames from simultaneously embedding into a single stator tooth, which could lead to localized saturation at that stator tooth. Attached Figure Description

[0043] Figure 1 This is a three-dimensional schematic diagram of the motor in Embodiment 1 of the present invention.

[0044] Figure 2 This is a three-dimensional schematic diagram of the winding skeleton located on the left side in Embodiment 1 of the present invention.

[0045] Figure 3 This is a three-dimensional schematic diagram (a) of the stator core in Embodiment 1 of the present invention.

[0046] Figure 4 This is a three-dimensional schematic diagram of the winding skeleton located on the right side in Embodiment 1 of the present invention.

[0047] Figure 5 This is a three-dimensional schematic diagram (II) of the stator core in Embodiment 1 of the present invention.

[0048] Figure 6 This is a partial schematic diagram of the winding skeleton in Embodiment 1 of the present invention.

[0049] Figure 7This is a partial schematic diagram of the stator core in Embodiment 1 of the present invention.

[0050] Figure 8 This is a three-dimensional schematic diagram of the motor stator in Embodiment 1 of the present invention.

[0051] Figure 9 This is a three-dimensional schematic diagram of the winding skeleton located on the left side in Embodiment 2 of the present invention.

[0052] Figure 10 This is a three-dimensional schematic diagram (III) of the stator core in Embodiment 2 of the present invention.

[0053] Figure 11 This is a perspective view of the winding frame located on the right side in Embodiment 2 of the present invention.

[0054] Figure 12 This is a three-dimensional schematic diagram (four) of the stator core in Embodiment 2 of the present invention.

[0055] Figure 13 This is a comparison diagram of the no-load back EMF of the motor in Embodiment 1 of the present invention and the motor in the conventional scheme.

[0056] Figure 14 This is a comparison diagram of the cogging torque of the motor in Embodiment 1 of the present invention and the motor in the conventional solution.

[0057] Explanation of reference numerals in the attached figures:

[0058] Motor 1000

[0059] Motor stator 1

[0060] Stator core 10

[0061] Stator teeth 11

[0062] Positioning groove 12

[0063] Positioning groove 121 on phase A stator teeth

[0064] Positioning groove 122 on phase B stator teeth

[0065] Positioning groove 123 on C-phase stator teeth

[0066] Winding bobbin 20

[0067] Skeleton Body 21

[0068] Positioning protrusion 22

[0069] Positioning protrusion 221 corresponding to the stator tooth of phase A

[0070] Positioning protrusion 222 corresponding to the B phase stator teeth

[0071] Positioning protrusion 223 corresponding to the C-phase stator teeth

[0072] Depth h1 of the positioning protrusion

[0073] Thickness w1 of the positioning protrusion

[0074] The length l1 of the positioning protrusion

[0075] Motor rotor 3

[0076] Rotor core 30

[0077] Permanent magnet 31 Detailed Implementation

[0078] The present invention is further illustrated below by way of embodiments, but the invention is not limited to the scope of the embodiments described herein. In the following text, the number of positioning protrusions is calculated in "pairs", and "number of positioning protrusions" refers to the number of pairs of positioning protrusions.

[0079] Example 1

[0080] like Figures 1-8 As shown, this invention provides a motor stator 1, comprising a stator core 10 and two winding frames 20 located on both sides, which are arranged in a three-phase, six-pole, nine-slot built-in permanent magnet synchronous motor with fractional-slot double-layer concentrated windings. The three phases are A phase, B phase, and C phase, with A and C phases being odd-numbered phases and B phase being an even-numbered phase. The motor stator 1 includes two winding frames 20 for the stator core 10. Nine stator teeth 11 are evenly distributed on the stator core 10, with each of the A-phase, B-phase, and C-phase windings corresponding to three stator teeth 11 for winding the coils. The two winding frames 20 are respectively arranged on both sides of the stator core 10.

[0081] like Figure 2 and Figure 4 As shown, each winding frame 20 has a positioning protrusion 22 that protrudes from the surface of the frame body 21 along the axial direction of the motor stator 1. These positioning protrusions 22 are arranged in pairs and are only provided in the area of ​​the frame body 21 corresponding to the stator teeth 11 of the stator core 10. These paired positioning protrusions 22 are positioned in conjunction with the two side surfaces of the corresponding stator teeth 11 so that the winding frame 20 can be positioned on the stator core 10.

[0082] In this embodiment, the sum of the number of positioning protrusions 22 on the two winding frames 20 is equal to the number of stator teeth on the stator core 10, that is, the total number of positioning protrusions 22 on the two winding frames 20 is 9 pairs, which is the same as the number of stator teeth on the stator core 10. Furthermore, the positioning protrusions 22 on the two winding frames 20 are respectively positioned on all stator teeth 11 of different phases (i.e., phase A, phase B, and phase C). Specifically, in this embodiment, the positioning protrusions 22 on the left side of the winding frame 20 of the stator core 10 are only set for phase B stator teeth 112, that is, the number of positioning protrusions 22 on the left side of the winding frame 20 is 3 pairs, and the positioning protrusions 22 on the right side of the winding frame 20 of the stator core 10 are set for phase A stator teeth and phase C stator teeth, that is, the total number of positioning protrusions 22 on the right side of the winding frame 20 is 6 pairs. Therefore, the number of positioning protrusions 22 on the two winding frames 20 is a total of 9 pairs, which is equal to the number of stator teeth 11 on the stator core 10, and they are respectively positioned on the corresponding stator teeth 11.

[0083] The positioning protrusions 22 of the winding frame 20 of the motor stator 1 correspond only to the stator tooth 11 area of ​​the stator core 10. By positioning the stator core 10 in cooperation with the two side surfaces of the stator tooth 11, the stator core 10 only needs to be slotted on both sides of the stator tooth 11 to cooperate with the positioning protrusions 22 of the winding frame 20 for installation. There is no need to slot in other areas of the positioning groove 12. This can reduce the groove opening area of ​​the stator core 10. Moreover, the slotting position is only located on the two side surfaces of the stator tooth 11. This can reduce the impact of the winding frame 20 embedding into the stator core 10 on the stator tooth width and yoke thickness at both ends of the stator core 10 in the axial direction, thereby reducing the impact on the electromagnetic performance of the motor.

[0084] In other embodiments, the number of the two winding frames 20 can be further controlled by making the sum of the number of positioning protrusions 22 in the two winding frames 20 less than the number of stator teeth of the stator core 10, so as to avoid the excessive number of positioning protrusions 22 and reduce the impact of the embedding of the winding frames 20 on the stator tooth width and yoke thickness at both ends of the stator core 10.

[0085] In short, for a multiphase concentrated winding motor, its stator 1 satisfies the following: For an n-phase (n≥2, and n is an integer) concentrated winding motor where n is odd, the winding frame on one side only contains positioning protrusions corresponding to the positioning teeth of the odd-numbered phases (i.e., (n+1) / 2 phases) such as phase A, phase C, and phase E. The number of positioning protrusions is equal to the sum of the number of coils of the (n+1) / 2 phases such as phase A, phase C, and phase E (the minimum number of protrusions is (n+1) / 2, i.e., each odd-numbered phase corresponds to one positioning tooth). The winding frame on the other side only contains positioning protrusions corresponding to the positioning teeth of the even-numbered phases (i.e., (n-1) / 2 phases) such as phase B and phase D. The number of positioning protrusions is equal to the sum of the number of coils of the (n-1) / 2 phases such as phase B and phase D (the minimum number of protrusions is (n-1) / 2, i.e., each even-numbered phase corresponds to one positioning tooth).

[0086] Of course, in other embodiments, when positioning protrusions 22 are respectively provided on the winding frames 20 on both sides to cooperate with different stator teeth of the stator core 10, the sum of the number of positioning protrusions 22 of the two winding frames 20 can also be less than the number of stator teeth of the stator core 10. By further reducing the number of positioning protrusions 22 of the winding frames 20, the influence of the embedding of the winding frames 20 on the stator tooth width and yoke thickness at both ends of the stator core 10 is reduced to avoid an excessive number of positioning protrusions 22. In this embodiment, the sum of the number of positioning protrusions 22 of the two winding frames 20 is equal to the number of stator teeth of the stator core 10. In other embodiments, the sum of the number of positioning protrusions 22 of the two winding frames 20 can also be less than the number of stator teeth of the stator core 10.

[0087] Furthermore, by positioning the positioning protrusions 22 of the two winding frames 20 respectively on the stator teeth 11 of different phases on the stator core 10, each stator tooth 11 of the stator core 10 can cooperate with at most one positioning protrusion 22 of the winding frame 20, which can ensure the balance of voltage of each phase of the motor. In addition, it avoids the positioning protrusions 22 of the two frames at both ends from being embedded in a single stator tooth 11 at the same time, which would cause local saturation at the stator tooth 11.

[0088] In this embodiment, the motor stator 1 is a multi-phase winding, with the positioning protrusion 22 of one winding frame 20 positioned on the stator teeth 11 of the odd-numbered phases, and the positioning protrusion 22 of the other winding frame 20 positioned on the stator teeth 11 of the even-numbered phases. Figures 1-8 As shown, in this embodiment, the positioning protrusion 22 of the winding skeleton 20 on the left side of the stator core 10 corresponds to the stator tooth 11 of phase B, and the positioning protrusion 22 of the winding skeleton 20 on the right side of the stator core 10 corresponds to the stator tooth 11 of phase A and the stator tooth 11 of phase C.

[0089] For the multi-phase winding motor stator 1, the positioning protrusion 22 of one winding frame 20 is set to correspond to the stator teeth 11 of the odd-numbered phases, while the positioning protrusion 22 of the other winding frame 20 is set to correspond to the stator teeth 11 of the even-numbered phases, so as to achieve a reasonable layout of the positioning protrusions 22 of the two winding frames 20 and ensure the balance of the voltage of each phase of the motor.

[0090] like Figures 1-8 As shown, the positioning protrusions 22 of one winding frame 20 are positioned on all the stator teeth 11 of the odd-numbered phases, and the positioning protrusions 22 of the other winding frame 20 are positioned on all the stator teeth 11 of the even-numbered phases. Specifically, in this embodiment, a pair of positioning protrusions 22 is provided for each stator tooth 11 corresponding to each B phase in the winding frame 20 on the left side of the stator core 10, and a pair of positioning protrusions 22 is provided for each stator tooth 11 corresponding to each A phase and C phase in the winding frame 20 on the right side of the stator core 10. In other embodiments, the positioning protrusions 22 of the winding frame 20 may also be positioned only on a single stator tooth 11 corresponding to each odd-numbered phase and each even-numbered phase, respectively.

[0091] like Figures 1-8 As shown, positioning grooves 12 are provided on both sides of the stator teeth 11. Specifically, the stator core 10 has three positioning grooves 122 on the left side of the axial direction of the three B-phase stator teeth, and three positioning grooves 121 on the right side of the axial direction of the three A-phase stator teeth and three positioning grooves 123 on the three C-phase stator teeth. The positioning grooves 12 are used to accommodate the positioning protrusions 22 on the corresponding phases and are positioned in cooperation with the positioning protrusions 22.

[0092] By providing positioning grooves 12 on both sides of the stator teeth 11 to accommodate and position the positioning protrusions 22 of the winding frame 20, the positioning effect between the winding frame 20 and the stator core 10 can be improved.

[0093] like Figures 1-8 As shown, the outer surface of the positioning protrusion 22 in the positioning groove 12 is flush with the two side surfaces of the stator tooth 11. By making the outer surface of the positioning protrusion 22 flush with the two side surfaces of the stator tooth 11, the space is rationally utilized for structural layout.

[0094] On the axial direction of the motor stator 1, the positioning protrusion 22 is set at the middle position corresponding to the stator tooth 11.

[0095] In the circumferential direction of the motor stator 1, the thickness w of the positioning protrusion 22 ranges from 0.5mm to 1mm. Specifically, in this embodiment, the thickness w1 of the positioning protrusion 22 is 0.7mm.

[0096] Along the axial direction of the motor stator 1, the depth h1 of the positioning protrusion 22 is between 3mm and 4mm. Specifically, in this embodiment, the depth h1 of the positioning protrusion 22 is 3.5mm.

[0097] In the radial direction of the motor stator 1, the length l of the positioning protrusion 22 is less than the tooth height of the stator tooth 11. Specifically, in this embodiment, the length l1 (3.2 mm) of the positioning protrusion 22 is less than the tooth height of the stator tooth 11.

[0098] In this embodiment, the positioning protrusion 22 is rectangular in shape and has a depth h1 of 3.5 mm.

[0099] By positioning the positioning protrusion 22 along the axial direction of the motor stator 1, corresponding to the middle position of the stator tooth 11, the positioning effect of the positioning protrusion 22 on the stator tooth 11 can be improved. Of course, in other embodiments, the designer can adjust the shape, size, and position of the positioning protrusion 22 relative to the stator tooth 11 according to actual usage requirements. This part belongs to the prior art in this field and will not be described in detail here.

[0100] This invention also provides a 3-phase, 6-pole, 9-slot built-in permanent magnet synchronous motor with fractional slot double-layer concentrated windings, comprising a motor stator 1 as described above, and a motor rotor 3, which includes a rotor core 30 and three pairs of permanent magnets 31. The motor 1000 adopts a rotor overhang structure, with the stator 1 having a stack thickness of 14 mm and the rotor 3 having a stack thickness of 26 mm. Using a conventional winding frame and stator core as a reference group for Embodiment 1, the winding frame positioning protrusions at both axial ends of the stator core have the same shape, each containing nine positioning protrusions with a thickness of 0.7 mm and a depth of 3.5 mm, respectively embedded in the teeth and yoke of the stator core at both axial ends. Correspondingly, each of the stator cores 10 at both axial ends contains nine positioning slots.

[0101] like Figure 9 As shown, the horizontal axis represents the rotor position (electrical angle), and the vertical axis represents the no-load back EMF (V). A comparative test of no-load back EMF was conducted using the motor in Example 1 and a motor with a conventional frame design (where the dashed line represents the motor in Example 1, and the solid line represents the conventional frame design). The speed was set at 1500 rpm for both. The fundamental amplitude of the no-load back EMF of the motor with the conventional frame design was 58.30V, while the fundamental amplitude of the no-load back EMF of the motor in Example 1 was 60.41V. Compared to the conventional design, the no-load back EMF of the motor in Example 1 was increased by 3.62%.

[0102] like Figure 10As shown, the horizontal axis represents the rotor position (electrical angle), and the vertical axis represents the cogging torque. A comparative test of no-load back EMF was conducted using the motor in Example 1 and a motor with a conventional frame design (where the dashed line represents the motor in Example 1, and the solid line represents the conventional frame design). The peak-to-peak cogging torque of the motor with the conventional frame design was 82.29 mNm, while the peak-to-peak cogging torque of the motor 1000 using the winding frame design in Example 1 was 60.16 mNm. Compared to the conventional design, the peak-to-peak cogging torque of the motor using the winding frame design in Example 1 was reduced by 26.89%.

[0103] Example 2

[0104] This embodiment also provides a motor stator 1, which differs from Embodiment 1 in that, in this embodiment, the total number of positioning protrusions on the two winding frames 20 is 3. Phase A, phase B, and phase C each correspond to a pair of positioning protrusions 22 to ensure voltage balance in each phase. At this time, the positioning protrusions 22 embedded in the stator core 10 have minimal impact on the electromagnetic performance of the motor. Specifically, a pair of positioning protrusions 22 are provided on the left winding frame 20 corresponding to one of the stator teeth 11 of phase B. A pair of positioning protrusions 22 are provided on the right winding frame 20 corresponding to one of the stator teeth 11 of phase A and one of the stator teeth 11 of phase C. The offset angle between the stator teeth 11 on the left and the stator teeth 11 on the right is approximately 180 degrees. At this offset angle, the fixing effect between the winding frame 20 and the stator core 10 is better.

[0105] Example 3

[0106] This embodiment also provides a motor stator 1, which differs from Embodiment 1 in that: in this embodiment, the motor corresponding to the motor stator 1 is a six-phase concentrated winding motor, specifically a six-phase ten-pole twelve-slot motor, with the six phases being phases A, B, C, D, E, and F. Phases A, C, and E are odd-numbered phases, while phases B, D, and F are even-numbered phases. In this motor stator 1, the stator core 10 is provided with twelve stator teeth 11, and the number of positioning protrusions 22 on both sides of the winding skeleton 20 is the same. In this embodiment, specifically, a winding skeleton 20 is provided on each of the left and right sides of the stator core 10, and the number of positioning protrusions 22 on the left and right sides of the winding skeleton 20 is the same, which is 3 pairs each, so that the structures of the two winding skeletons 20 located on both sides of the stator core 10 are roughly the same, ensuring the balance of voltage in each phase of the motor.

[0107] Meanwhile, in this embodiment, the sum of the number of positioning protrusions 22 of the two winding frames 20 (6 pairs) is less than the number of stator teeth of the stator core 10 (12). In short, the motor stator 1 in embodiment 2 satisfies the following: for an n-phase (n≥2, and n is an integer) concentrated winding motor and when n is an even number, one side of the winding frame only contains positioning protrusions corresponding to a single positioning tooth of the A-phase, C-phase, etc. (n / 2 phases) windings, and the number of positioning protrusions is equal to the sum of the number of single coils corresponding to the A-phase, C-phase, etc. (n / 2 phases) windings respectively; the other side of the winding frame only contains positioning protrusions corresponding to a single positioning tooth of the B-phase winding and the D-phase, etc. (n / 2 phases) windings, and the number of positioning protrusions is equal to the sum of the number of single coils corresponding to the B-phase winding and the D-phase, etc. (n / 2 phases) windings respectively.

[0108] In this embodiment, the positioning protrusion 22 of one winding frame 20 is positioned on each odd-numbered stator tooth 11, and the positioning protrusion 22 of the other winding frame 20 is positioned on each even-numbered stator tooth 11. Specifically, in this embodiment, a pair of positioning protrusions 22 is provided in the winding frame 20 on the left side of the stator core 10 for each stator tooth 11 corresponding to phase B, phase D, and phase F, and a pair of positioning protrusions 22 is provided in the winding frame 20 on the right side of the stator core 10 for each stator tooth 11 corresponding to phase A, phase C, and phase E.

[0109] In other embodiments, one winding frame 20 may have a positioning protrusion 22 positioned on the stator teeth 11 of the odd-numbered phases, and another winding frame 20 may have a positioning protrusion 22 positioned on all the stator teeth 11 of the even-numbered phases; or one winding frame 20 may have a positioning protrusion 22 positioned on the stator teeth 11 of the odd-numbered phases, and another winding frame 20 may have a positioning protrusion 22 positioned on the stator teeth 11 of the even-numbered phases. These can be adjusted according to the usage requirements. This part belongs to the prior art in this field and will not be described in detail here.

[0110] Example 4

[0111] This embodiment also provides a motor stator 1, which differs from Embodiment 1 in that, in this embodiment, the motor stator 1 is a single-phase winding, which includes six stator teeth 11, numbered sequentially in a clockwise direction as tooth 1, tooth 2, tooth 3, tooth 4, tooth 5, and tooth 6. The positioning protrusion 22 of one winding frame 20 is positioned on the stator teeth 11 numbered odd, and the positioning protrusion 22 of the other winding frame 20 is positioned on the stator teeth 11 numbered even. Specifically, the winding frame 20 on the left side of the stator core 10 has a pair of positioning protrusions 22 on each of the stator teeth 11 numbered as tooth 2, tooth 4, and tooth 6, which is the same number as the positioning protrusions 22 on the right side of the winding frame 20 (a pair of positioning protrusions 22 are set on each of the stator teeth 11 numbered as tooth 1, tooth 3, and tooth 5) (both are 3 pairs), for a total of 6 positioning protrusions 22, which is equal to the number of stator teeth 11 (6). In short, the motor stator 1 in Example 3 satisfies the following: For an n-phase (n=1) concentrated winding motor, the number of stator teeth is 2m (m is a positive integer), which are teeth 1, 2, 3...2m along the circumferential direction. One side of the winding frame contains only the positioning protrusions corresponding to teeth 1, 3...2m-1, with a quantity of m (minimum value of 1, i.e., only corresponding to a stator tooth with an odd number). The other side of the winding frame contains only the positioning protrusions corresponding to teeth 2, 4...2m, with a quantity of m (minimum value of 1, i.e., only corresponding to a stator tooth with an even number).

[0112] In other embodiments, the number of the two winding frames 20 can be further controlled by making the sum of the number of positioning protrusions 22 in the two winding frames 20 less than the number of stator teeth of the stator core 10, so as to avoid the excessive number of positioning protrusions 22 and reduce the impact of the embedding of the winding frames 20 on the stator tooth width and yoke thickness at both ends of the stator core 10.

[0113] For a single-phase winding motor stator 1, the positioning protrusion 22 of one winding frame 20 is set to correspond to the stator teeth 11 with odd numbers, while the positioning protrusion 22 of the other winding frame 20 is set to correspond to the stator teeth 11 with even numbers. This achieves a reasonable layout of the positioning protrusions 22 of the two winding frames 20, making the structures of the two winding frames 20 located on both sides of the stator core 10 approximately the same, which can improve the operating stability of the motor stator 1.

[0114] In this embodiment, the positioning protrusion 22 of one winding frame 20 is positioned on all the odd-numbered stator teeth 11, while the positioning protrusion 22 of the other winding frame 20 is positioned on all the even-numbered stator teeth 11. In other embodiments, the positioning protrusion 22 of any winding frame 20 may be positioned only on a portion of the odd or even number of stator teeth 11.

[0115] While specific embodiments of the present invention have been described above, those skilled in the art should understand that these are merely illustrative examples, and the scope of protection of the present invention is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of the present invention, but all such changes and modifications fall within the scope of protection of the present invention.

Claims

1. A motor stator, characterized in that, It includes: Stator core; Two winding frames are respectively located on both sides of the stator core. Each winding frame has a positioning protrusion that protrudes from the surface of the frame body along the axial direction of the motor stator. The positioning protrusions are arranged in pairs and are only located in the area of ​​the frame body corresponding to the stator teeth of the stator core. The paired positioning protrusions are positioned in conjunction with the two side surfaces of the corresponding stator teeth. Wherein, the sum of the number of the positioning protrusions of the two winding frames is less than or equal to the number of stator teeth of the stator core; When the motor stator is a multi-phase winding motor stator, the positioning protrusion of one of the winding frames is positioned on the stator teeth of the odd-numbered phases including phase A and phase C, and the positioning protrusion of the other winding frame is positioned on the stator teeth of the even-numbered phases including phase B. Alternatively, when the motor stator is a single-phase winding motor stator, the positioning protrusion of one of the winding frames is positioned on the stator tooth numbered odd, and the positioning protrusion of the other winding frame is positioned on the stator tooth numbered even.

2. The motor stator as described in claim 1, characterized in that, In the circumferential direction of the motor stator, the positioning protrusions of the two winding frames are alternately distributed; And / or, in the circumferential direction of the motor stator, the positioning protrusions are spaced apart on the winding frame; And / or, the sum of the number of the positioning protrusions of the two winding frames is less than the number of stator teeth of the stator core.

3. The motor stator as described in claim 1, characterized in that, When the motor stator is a multi-phase winding motor stator, the positioning protrusion of one of the winding skeletons is positioned on all or part of the stator teeth of the odd number of phases including phase A and phase C. And / or, the positioning protrusion of another winding frame is positioned on all or part of the stator teeth of an even number of phases, including phase B.

4. The motor stator as described in claim 1, characterized in that, When the motor stator is a single-phase winding motor stator, the positioning protrusion of one of the winding skeletons is positioned on some or all of the stator teeth numbered odd. And / or, the positioning protrusion of another winding frame is positioned on some or all of the even-numbered stator teeth.

5. The motor stator as described in claim 1, characterized in that, Positioning grooves are provided on both sides of the stator teeth. The positioning grooves are used to accommodate the positioning protrusions and are positioned in conjunction with the positioning protrusions.

6. The motor stator as described in claim 5, characterized in that, The outer surface of the positioning protrusion within the positioning groove is flush with the two side surfaces of the stator tooth.

7. The motor stator as described in any one of claims 1-6, characterized in that, Along the axial direction of the motor stator, the positioning protrusion is positioned corresponding to the middle position of the stator teeth; And / or, in the circumferential direction of the motor stator, the thickness w of the positioning protrusion ranges from 0.5mm to 1mm; And / or, along the axial direction of the motor stator, the depth h of the positioning protrusion ranges from 3mm to 4mm; And / or, in the radial direction of the motor stator, the length l of the positioning protrusion is less than the tooth height of the stator tooth; And / or, the positioning protrusion is rectangular in shape.

8. An electric motor, characterized in that, It includes the motor stator as described in any one of claims 1-7.

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