Stator punching sheet, stator and motor

Abstract

The utility model provides a stator punching sheet, a stator and a motor, which can reduce cogging torque and torque pulsation of the motor. The stator punching sheet comprises a tooth yoke part and a tooth part, one end, far away from the tooth yoke part, of the tooth part is a tooth boot part, the tooth boot part is provided with two inclined trimming edges, namely a first trimming edge and a second trimming edge, and the first trimming edge and the second trimming edge are symmetrically arranged relative to a tooth center line; the first cut edge and the second cut edge intersect to define the inner side edge of the tooth shoe part, and the inner side edge of the tooth shoe part is in a V shape with an opening facing the side where the tooth yoke part is located. Comprising a stator and a rotor which are formed by the stator punching sheet, the circumferential width sizes of the stator and rotor air gaps are inconsistent, the width size of the stator and rotor air gaps at the tooth center line is small, and the width size of the stator and rotor air gaps at the two sides of the tooth center line is large, so that the air gap magnetic flux density waveform is more sinusoidal, namely is closer to sine waves; and the cogging torque and the torque pulsation can be reduced, so that the motor performance is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to motor technical field, concretely relates to structural improvement and corresponding stator and motor of motor stator lamination. BACKGROUND

[0002] With the popularization of new energy vehicles, electric motorcycles also become the next industry breakthrough point, compared with traditional fuel motorcycles, electric motorcycles have the advantage of zero emission, are more friendly to the environment and meet the requirements of sustainable development. The continuous improvement of battery technology improves the energy efficiency of electric motorcycles. In comparison, the energy efficiency of fuel motorcycles is low and depends on limited fossil fuel resources. As one of the power sources of electric motorcycles, the performance of the main drive motor directly affects the endurance and NVH (noise, vibration and harshness) experience of the electric motorcycle.

[0003] At present, the main drive motor of the electric motorcycle has the following problems: the large slot torque causes the electric motorcycle to have a jerk feeling when idling; the slot torque causes the torque ripple of the permanent magnet motor, which in turn causes speed fluctuations, making the motor vibrate and produce noise, seriously affecting the positioning accuracy and servo performance of the motor; the large torque ripple causes electromagnetic noise screaming, affecting the driving experience. SUMMARY

[0004] The utility model provides a kind of stator lamination, stator and motor, which can reduce motor slot torque and torque ripple.

[0005] To achieve the above technical effects, the stator lamination proposed by the utility model adopts the technical scheme of a kind of stator lamination, comprising:

[0006] The tooth yoke part and the tooth part are connected to the inner peripheral wall of the tooth yoke part, the number of tooth parts is multiple and arranged along the circumference of the tooth yoke part, and a slot part is formed between each adjacent two tooth parts; the end of the tooth part away from the tooth yoke part is a tooth shoe part, the tooth shoe part has two inclined edges of first and second edges, and the first and second edges are symmetrically arranged with respect to the tooth center line; the first and second edges intersect to form the inner side of the tooth shoe part, and the inner side of the tooth shoe part is V-shaped with the opening facing the side where the tooth yoke part is located.

[0007] The included angle A of the first and second edges satisfies: 160°≤A≤176°.

[0008] The two side tips of the tooth shoe part are convexly arc-shaped and symmetric with respect to the tooth center line.

[0009] The stator lamination is an integral structure.

[0010] The utility model also proposes a kind of stator, including multiple alignment lamination above-mentioned stator lamination.

[0011] The utility model also proposes a kind of motor, including the stator and rotor of coaxial arrangement, the outer peripheral wall of the rotor and the inner peripheral wall of the stator form stator rotor air gap, the edge of the rotor is uniformly distributed with multiple magnetic steel, each the magnetic steel is respectively aligned with the partial area of rotor outer peripheral wall;The stator is above-mentioned stator.

[0012] Multiple arc groove groups are provided on the rotor outer peripheral wall, and multiple arc groove groups and multiple magnetic steels are one-to-one correspondingly arranged;

[0013] Each arc groove group includes first arc groove and second arc groove, the first arc groove and the second arc groove are symmetrically arranged with respect to motor d axis, and the slot opening is towards the side where the stator is located;

[0014] The position of the first arc groove and the second arc groove does not exceed the rotor outer peripheral wall region aligned with the magnetic steel.

[0015] The first arc groove is elliptical groove, and the distance L from the center of the elliptical profile where the first arc groove is located to the rotor outer peripheral wall satisfies: 0.1×gap≤L≤0.3×gap, wherein: gap is the width of stator rotor air gap, and the unit is mm;

[0016] The angle M between the connecting line from the center of the elliptical profile where the first arc groove is located to rotor center and the motor d axis satisfies: 3°≤M≤9°;

[0017] The long semi-axis length a of the elliptical profile where the first arc groove is located satisfies: R / 3-0.5≤a≤R / 3+0.5, and the short semi-axis length b satisfies: 0.35×a≤b≤0.55×a, a and b are in mm, and R is rotor radius, and the unit is mm.

[0018] The cross section of the magnetic steel is rectangular, and the length ML satisfies: 2×R×sin20°≤ML≤2×R×sin43°, and R is rotor radius, and the unit is mm.

[0019] The motor is 8-pole 12-slot motor.

[0020] Compared with prior art, the utility model has the following advantages and positive effects:

[0021] The stator lamination in the utility model, the tooth shoe part has two inclined cut edges of first cut edge and second cut edge, the first cut edge and the second cut edge are symmetrically arranged relative to the tooth center line; the first cut edge and the second cut edge intersect to form an inside edge of the tooth shoe part, the inside edge is V-shaped with an opening facing the side where the tooth yoke part is located; the motor including the stator and the rotor formed by the stator lamination, the width size of the stator-rotor air gap is inconsistent in all directions in the circumferential direction, that is, the stator-rotor air gap is uneven, the width size of the stator-rotor air gap at the tooth center line is small, the width size of the stator-rotor air gap at both sides of the tooth center line is large, the air gap magnetic flux density waveform can be more sinusoidal, that is, closer to the sine wave, which is conducive to reducing the tooth slot torque and torque ripple, thereby improving the motor performance. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or the prior art, the drawings needed to be used in the embodiment or the prior art description will be briefly introduced below, obviously, the drawings in the following description are some embodiments of the utility model, and other drawings can also be obtained according to these drawings without creative labor for those skilled in the art.

[0023] Figure 1 It is the structure schematic view of the motor according to the embodiment of the utility model;

[0024] Figure 2 It is the structure schematic view of the motor according to the embodiment of the utility model; Figure 1

[0025] Figure 3 It is the structure schematic view of one tooth part of the stator lamination according to the embodiment of the utility model;

[0026] Figure 4 It is the structure schematic view of one tooth part of the stator lamination according to the embodiment of the utility model; Figure 1

[0027] Figure 1 Reference numerals in the drawings:

[0028] 100, stator;110, tooth yoke part;120, tooth part;130, slot part;140, tooth shoe part;141, first cut edge;142, second cut edge;143, shoe tip;

[0029] 200, rotor;210, magnetic steel slot;220, magnetic steel;230, arc-shaped slot group;231, first arc-shaped slot;232, second arc-shaped slot;

[0030] 300, stator-rotor air gap;

[0031] 400, motor d-axis. DETAILED DESCRIPTION

[0032] ​​In the description of the utility model, it is necessary to explain that, unless there is definite stipulation and limitation, the terms "mount", "link", "connect" should be understood in broad sense, for example, it can be fixed connection, also can be detachable connection, or integrally connected, it can be direct connection, also can be indirect connection through intermediate medium, it can be the communication inside two elements, for the ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to specific circumstances.

[0033] In addition, the technical features involved in the different embodiments of the utility model described below can be combined with each other as long as there is no conflict.

[0034] Referring to Figures 1 to 3 The motor in the embodiment of the utility model, including coaxial arrangement stator 100 and rotor 200, the outer peripheral wall of rotor 200 and the inner peripheral wall of stator 100 form stator-rotor air gap 300, specifically the gap between the outer peripheral wall of rotor 200 and each toothed shoe part 140.

[0035] The edge of rotor 200 is uniformly distributed with a plurality of magnetic steel grooves 210, one magnetic steel 220 is arranged in each magnetic steel groove 210, each magnetic steel 220 is aligned with a part of the outer peripheral wall of rotor 200, that is, along the circumferential direction, each magnetic steel 220 respectively faces a part of the outer peripheral wall of rotor 200.

[0036] Stator 100 includes a plurality of aligned and stacked stator lamination, each stator lamination includes tooth yoke part 110 and tooth part 120, tooth yoke part 110 is a circular ring sheet, tooth part 120 is connected on the inner peripheral wall of tooth yoke part 110, the number of tooth parts 120 is multiple and is arranged along the circumferential direction of tooth yoke part 110, and the slot part 130 is formed between each adjacent two tooth parts 120.

[0037] Tooth part 120 extends to the axis direction of stator lamination, one end is connected on the inner peripheral wall of tooth yoke part 110, and the other end is away from tooth yoke part 110, and this end is toothed shoe part 140 of tooth part 120.In some embodiments of the utility model, toothed shoe part 140 has two inclined cut edges of first cut edge 141 and second cut edge 142, first cut edge 141 and second cut edge 142 are symmetrically arranged relative to tooth center line H;First cut edge 141 and second cut edge 142 intersect to form the inside edge of toothed shoe part 140, and the inside edge of toothed shoe part 140 is V-shaped and opens to the side where tooth yoke part 110 is located, as shown in Figure 2 And Figure 3 As shown.

[0038] By cutting out the inclined first cut edge 141 and the second cut edge 142, the inner side edge of the tooth shoe part 140 is formed as a V-shaped opening toward the side where the tooth yoke part 110 is located, and the V-shaped tooth shoe part 140 is formed, so that the width size of the stator-rotor air gap 300 is inconsistent in the circumferential direction, the width size of the stator-rotor air gap 300 at the tooth center line H is small, and the width size of the stator-rotor air gap 300 on both sides of the tooth center line H is large. Compared with the stator-rotor air gap 300 of uniform size in the related art, the air gap magnetic flux density waveform of the utility model can be more sinusoidal, that is, closer to a sine wave, which is conducive to reducing the cogging torque and torque ripple, thereby improving the motor performance, and further improving the endurance of the electric vehicle or electric motorcycle using the motor in the utility model embodiment, and improving the NVH (noise, vibration and harshness) experience.

[0039] Further, the included angle A of the first cut edge 141 and the second cut edge 142 is preferably 160°≤A≤176°.

[0040] The two side shoe tips 143 of the tooth shoe part 140 are outwardly convex arc-shaped and symmetric with respect to the tooth center line H, and the two side shoe tips 143 respectively protrude to the slot openings of the two slot parts 130 on both sides of the tooth part 120.

[0041] The stator punching sheet is an integrally formed structure, so that the combination of the tooth yoke part 110 and the tooth part 120 is punched as a whole during processing, and the tooth yoke part 110 and the tooth part 120 do not need to be assembled, the whole is good in integrity, the processing is simplified, the assembly process is saved, and the production efficiency is improved.

[0042] In some embodiments of the utility model, as shown in Figure 2 The outer peripheral wall of the rotor 200 is provided with a plurality of arc-shaped groove groups 230, and the plurality of arc-shaped groove groups 230 are one-to-one corresponding to the plurality of magnetic steels 220, that is, each magnetic steel 220 corresponds to an arc-shaped groove group 230.

[0043] Each arc-shaped groove group 230 includes a first arc-shaped groove 231 and a second arc-shaped groove 232, and the first arc-shaped groove 231 and the second arc-shaped groove 232 are symmetrically arranged with respect to the motor d-axis 400 (that is, the center line of the magnetic steel 220), and the slot opening is toward the side where the stator 100 is located, that is, the slot opening is outward.

[0044] The first arc-shaped groove 231 and the second arc-shaped groove 232 are equal in structure and consistent in size, and both penetrate the rotor 200 in the axial direction of the rotor 200, as shown in Figure 2 For each arc-shaped groove group 230, the positions of the first arc-shaped groove 231 and the second arc-shaped groove 232 do not exceed the outer peripheral wall region of the rotor 200 directly opposite the corresponding magnetic steel 220.

[0045] Specifically, as shown in Figure 2Taking the first complete arc-shaped slot group 230 on the left side in the figure as an example, the rotor 200 outer wall region corresponding to the magnetic steel 220 opposite to the arc-shaped slot group 230 is a region c in the dashed box, and the first arc-shaped slot 231 and the second arc-shaped slot 232 of the arc-shaped slot group 230 cannot exceed the region c in the circumferential direction.

[0046] By arranging the plurality of arc-shaped slot groups 230, the uneven degree of the stator-rotor air gap 300 is further increased, the air gap magnetic flux density waveform is further close to a sine wave, and the cogging torque and the torque ripple are further reduced.

[0047] By arranging the first arc-shaped slot 231 and the second arc-shaped slot 232 of each arc-shaped slot group 230 in the rotor 200 outer wall region corresponding to the magnetic steel 220 opposite to the arc-shaped slot group 230, the motor torque loss is avoided, and the motor efficiency is not affected.

[0048] Further, referring to Figure 4 , in combination with Figure 2 , the first arc-shaped slot 231 and the second arc-shaped slot 232 are preferably elliptical slots, and the distance L from the center O of the elliptical contour of the first arc-shaped slot 231 to the rotor 200 outer wall satisfies: 0.1×gap≤L≤0.3×gap, wherein: gap is the width of the stator-rotor air gap 300, and the unit is mm.

[0049] The angle M between the line connecting the center O of the elliptical contour of the first arc-shaped slot 231 to the center of the rotor 200 and the motor d-axis 400 satisfies: 3°≤M≤9°.

[0050] The length a of the major axis of the elliptical contour of the first arc-shaped slot 231 satisfies: R / 3-0.5≤a≤R / 3+0.5, and the length b of the minor axis satisfies: 0.35×a≤b≤0.55×a, wherein a and b are mm.

[0051] The second arc-shaped slot 232 and the first arc-shaped slot 231 are equal in structure and consistent in size, and details are not repeated here.

[0052] For the magnetic steel 220, as shown in Figure 2 and Figure 3 , the cross section is rectangular, and the length ML satisfies: 2×R×sin20°≤ML≤2×R×sin43°, wherein R is the radius of the rotor 200, and the unit is mm.

[0053] In some embodiments of the utility model, the motor adopts an 8-pole 12-slot scheme, that is, an 8-pole 12-slot motor.

[0054] Finally, it should be noted that the above examples are intended to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that the technical solutions recorded in the foregoing examples can still be modified, or some technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A stator lamination characterized by, The tooth yoke part and the tooth part are connected to the inner peripheral wall of the tooth yoke part, the tooth part is multiple in number and is arranged in a circumferential interval along the tooth yoke part, and a groove part is formed between each two adjacent tooth parts; the end of the tooth part away from the tooth yoke part is a tooth shoe part, the tooth shoe part has two inclined cut edges, i.e., a first cut edge and a second cut edge, the first cut edge and the second cut edge are symmetrically arranged with respect to the tooth center line; the first cut edge and the second cut edge intersect to form the inner side edge of the tooth shoe part, and the inner side edge of the tooth shoe part is in a V shape with an opening facing the side where the tooth yoke part is located.

2. The stator lamination of claim 1, wherein an included angle A of the first cut edge and the second cut edge satisfies 160°≤A≤176°.

3. The stator lamination of claim 1, wherein the two side shoe tips of the tooth shoe part are in an outward convex arc shape and are symmetric with respect to the tooth center line.

4. The stator lamination of claim 1, wherein the stator lamination is in an integral molding structure. a plurality of the stator laminations of any one of claims 1 to 4 are aligned and laminated.

5. A stator characterized by, the stator is the stator of claim 5.

6. An electric machine comprising a stator and a rotor arranged coaxially, a stator-rotor air gap being formed between the outer peripheral wall of the rotor and the inner peripheral wall of the stator, the edges of the rotor being uniformly provided with a plurality of magnetic steels, each of said magnetic steels being aligned with a portion of the area of the outer peripheral wall of the rotor; characterized in that, 7. The motor of claim 6, wherein a plurality of arc-shaped slot groups are arranged on the outer peripheral wall of the rotor, and each of the arc-shaped slot groups is arranged in one-to-one correspondence with each of the magnetic steels; each of the arc-shaped slot groups comprises a first arc-shaped slot and a second arc-shaped slot, the first arc-shaped slot and the second arc-shaped slot are symmetrically arranged with respect to the d-axis of the motor, and the slot openings face the side where the stator is located; the positions of the first arc-shaped slot and the second arc-shaped slot do not exceed the region of the outer peripheral wall of the rotor directly opposite the magnetic steel.

8. The motor of claim 7, wherein the first arc-shaped slot is an elliptical slot, the distance L from the center of the elliptical contour where the first arc-shaped slot is located to the outer peripheral wall of the rotor satisfies 0.1×gap≤L≤0.3×gap, wherein: gap is the air gap width between the stator and the rotor, and the unit is mm; the angle M between the line connecting the center of the elliptical contour where the first arc-shaped slot is located to the center of the rotor and the d-axis of the motor satisfies 3°≤M≤9°; the length a of the major axis of the elliptical contour where the first arc-shaped slot is located satisfies R / 3-0.5≤a≤R / 3+0.5, and the length b of the minor axis satisfies 0.35×a≤b≤0.55×a, wherein: a and b are in mm, and R is the radius of the rotor, and the unit is mm.

9. The motor of claim 6, wherein the cross section of the magnetic steel is in a rectangular shape, and the length ML of the magnetic steel satisfies 2×R×sin20°≤ML≤2×R×sin43°, wherein: R is the radius of the rotor, and the unit is mm.

10. The motor of claim 6, wherein the motor is an 8-pole 12-slot motor. ​

Images