Stator punching sheet, stator, motor, power system and vehicle

Abstract

The invention provides a stator punching sheet, a stator, a motor, a power system and a vehicle. The stator punching sheet comprises an annular yoke part and a stator punching part, the multiple tooth parts are arranged at intervals in the circumferential direction of the stator punching sheet, each tooth part comprises a tooth body and a tooth boot, the tooth bodies are connected between the tooth boots and the inner circumferential wall of the annular yoke part, and a stator groove is defined by every two adjacent tooth parts and the annular yoke part; in every two adjacent tooth parts, the side walls, close to each other, of the two tooth bodies in the circumferential direction of the stator punching sheet are marked as a first side wall and a second side wall respectively, and the first side wall and the second side wall are arranged in parallel; along the circumferential direction of the stator punching sheet, the width of the end portion, deviating from the annular yoke portion, of the tooth body is marked as Wt, the distance from the first side wall to the second side wall is marked as Ws, the number of the stator grooves is marked as s, the inner diameter of the stator punching sheet is marked as Ds1, and 0.47 * pi * (Ds1 / s) < = Wt < = 1.45 * Ws.

Description

Technical Field

[0001] The present application relates to the technical field of motors, and in particular to a stator punching sheet, a stator, a motor, a power system and a vehicle. Background Art

[0002] Stator laminations are key components in motors. The magnetic circuit and magnetic density of the stator laminations directly affect the efficiency of the motor. Good magnetic density performance will reduce the operating noise of the motor and improve the performance of the motor.

[0003] In the related art, the structural setting of the stator punching of the permanent magnet synchronous motor is unreasonable, which has a negative impact on the operating parameter indicators of the motor, such as high energy consumption and low working efficiency of the motor. Summary of the Invention

[0004] This application aims to solve at least one of the technical problems existing in the prior art or related art.

[0005] To this end, a first aspect of the present application provides a stator punching sheet.

[0006] A second aspect of the present application provides a stator.

[0007] A third aspect of the present application provides a motor.

[0008] A fourth aspect of the present application provides a power system.

[0009] A fifth aspect of the present application provides a vehicle.

[0010] In view of this, the first aspect of the present application provides a stator punching, comprising: an annular yoke; a plurality of tooth portions, the plurality of tooth portions being arranged at intervals along the circumference of the stator punching, the tooth portions comprising a tooth body and a tooth shoe, the tooth body being connected between the tooth shoe and the inner circumferential wall of the annular yoke, and two adjacent tooth portions and the annular yoke enclosing a stator slot; in two adjacent tooth portions, along the circumference of the stator punching, the side walls of the two tooth bodies close to each other are respectively recorded as the first side wall and the second side wall, and the first side wall and the second side wall are arranged in parallel; along the circumference of the stator punching, the width of the end of the tooth body away from the annular yoke is recorded as Wt, the distance from the first side wall to the second side wall is recorded as Ws, the number of stator slots is recorded as s, and the inner diameter of the stator punching is recorded as Ds1, wherein 0.47×π×(Ds1 / s)≤Wt≤1.45×Ws.

[0011] The present application provides a stator punching sheet including an annular yoke portion and a plurality of tooth portions.

[0012] It can be understood that the annular yoke includes an inner circumferential wall and an outer circumferential wall, and along the direction from the tooth portion to the annular yoke, the inner circumferential wall of the annular yoke and the outer circumferential wall of the annular yoke are arranged at intervals.

[0013] Any one of the plurality of tooth portions is connected to the inner peripheral wall of the annular yoke portion, and the plurality of tooth portions are arranged at intervals along the circumferential direction of the stator sheet.

[0014] Each of the multiple tooth sections consists of a tooth body and a tooth shoe. The tooth body is connected between the tooth shoe and the inner circumferential wall of the annular yoke. Of two adjacent tooth sections, one is designated as the first tooth section, and the other is designated as the second tooth section. Along the circumference of the stator lamination, the side wall of the first tooth section facing the second tooth section is designated as the first side wall, and the side wall of the second tooth section facing the first tooth section is designated as the second side wall. The first and second side walls are arranged parallel to each other.

[0015] The shape of the tooth body is indirectly defined by defining the mating structure of the first and second side walls. For example, the width of the tooth body in the circumferential direction of the stator sheet gradually decreases from the annular yoke to the tooth portion. This satisfies the requirement for a parallel arrangement of the first and second side walls. Optionally, both the first and second side walls are planar; alternatively, both the first and second side walls are curved.

[0016] Along the circumference of the stator punching sheet, the width of the end of the tooth body away from the annular yoke is recorded as Wt, the distance from the first side wall to the second side wall is recorded as Ws, the number of stator slots is recorded as s, and the inner diameter of the stator punching sheet is recorded as Ds1. It can be understood that the tooth top width of the tooth body (i.e., the width of the end of the tooth body away from the annular yoke) Wt and the distance from the first side wall to the second side wall Ws can affect the size of the stator slot of the motor and the saturation degree of the tooth portion. In order to ensure a reasonable slot fill rate and current density of the motor, it is necessary to reasonably constrain the size of the teeth and stator slots of the stator punching sheet. Excessive Wt and too small Ws, or too small Wt and too large Ws, will lead to unreasonable stator size design of the motor, the existence of oversaturated and undersaturated areas of the magnetic density design, resulting in large magnetic leakage in the oversaturated area of the magnetic density, which will waste materials in the undersaturated area of the magnetic density, resulting in insufficient cross-linking of the rotor magnetic field and the stator magnetic field, and the failure to fully exert the performance of the motor. At the same time, it will lead to a reduction in the output torque of the motor, large harmonic content of the motor, poor back EMF waveform, low motor efficiency, insufficient stator stiffness of the motor, large vibration noise, which will greatly increase the manufacturing cost of the same motor.

[0017] Therefore, in order to balance the cost of the motor and the electromagnetic performance of the motor, it is necessary to perform a reasonable numerical matching on the tooth part of the stator punching sheet and the structure of the stator slot. Make Wt, Ws, s, and Ds1 satisfy 0.47×π×(Ds1 / s) ≤ Wt ≤ 1.45×Ws. In this way, while keeping the total area of the stator slot unchanged, the slot leakage magnetic field of the motor can be reduced, the parameter matching between the tooth part and the stator slot can be made more reasonable, the production cost of the motor and the electromagnetic performance of the motor can be balanced, the magnetic density distribution is uniform, and the leakage magnetic field is small, which is beneficial to increasing the copper ratio of the winding and improving the material utilization rate of the motor. While ensuring that the motor has a reasonable current density, the manufacturing cost of the motor is not increased, and the output torque and efficiency of the motor are maximized. Moreover, the stator punching sheet has good stiffness, which is beneficial to improving the vibration and noise of the motor. That is to say, while not increasing the production cost of the motor, the efficiency, peak torque, and peak power output of the motor are balanced.

[0018] According to the above-mentioned stator punching sheet of the present application, the following additional technical features may also be provided:

[0019] In some embodiments, optionally, the annular yoke portion is a structure with an equal ring width. The ring width of the annular yoke portion is denoted as Ys, and the outer diameter of the stator punching sheet is denoted as Ds2. Among them, 0.13 ≤ Ys / (Ds2 - Ds1) ≤ 0.25, and 150 mm ≤ Ds2 ≤ 270 mm.

[0020] In this embodiment, the structure of the stator punching sheet is further defined such that the annular yoke portion is a structure with an equal ring width. It can be understood that the distance from the inner peripheral wall to the outer peripheral wall of the annular yoke portion is the ring width of the annular yoke portion. That is to say, multiple tooth portions cooperate with the annular yoke portion, and any two adjacent tooth portions and the annular yoke portion enclose a stator slot. The distance from the bottom surface of the stator slot to the outer peripheral wall of the annular yoke portion is the ring width of the annular yoke portion.

[0021] The ring width of the annular yoke portion affects the magnetic density of the annular yoke portion, the size of the stator slot, the torque output of the motor, and the stiffness of the stator. The present application reasonably sets the relationship between Ys, Ds2, and Ds1. On the premise of satisfying the torque output of the motor and the stiffness of the stator, the magnetic density of the annular yoke portion of the motor and the space of the stator slot are optimized, which is beneficial to improving the efficiency of the motor. Among them, the ring width of the annular yoke portion of the motor is adjusted, and the ring width of the annular yoke portion is restricted by the size space of the stator itself, that is, the ring width of the annular yoke portion is restricted by the inner diameter Ds1 and the outer diameter Ds2 of the stator punching sheet. For this reason, the present application defines 0.13 ≤ Ys / (Ds2 - Ds1) ≤ 0.25, and 150 mm ≤ Ds2 ≤ 270 mm, which can reasonably allocate the radial ratio of the stator slot and the annular yoke portion under the condition of limited stator size. On the premise of balancing the cost and electromagnetic performance of the motor, the output torque and efficiency of the motor are maximized, and this structural setting makes the stator punching sheet have better stiffness, which is beneficial to improving the vibration and noise of the motor.

[0022] Among them, the equal ring width structure means that the ring widths at different positions of the annular yoke are equal.

[0023] In some embodiments, optionally, among two adjacent tooth parts, along the circumferential direction of the stator punching sheet, the side walls of the two tooth boots close to each other are respectively denoted as a first widening section and a second widening section; along the direction from the annular yoke to the tooth part, the distance from the first widening section to the second widening section gradually decreases.

[0024] In this embodiment, the mating structure of multiple tooth parts of the stator punching sheet is further defined.

[0025] The tooth boots of two adjacent tooth parts are respectively denoted as a first tooth boot and a second tooth boot. Along the circumferential direction of the stator punching sheet, the side wall of the first tooth boot facing the second tooth boot is denoted as the first widening section, and the side wall of the second tooth boot facing the first tooth boot is denoted as the second widening section.

[0026] It can be understood that the first side wall is connected to the first widening section, and the second side wall is connected to the second widening section.

[0027] Among them, along the direction from the annular yoke to the tooth part, the distance from the first widening section to the second widening section gradually decreases, that is, along the direction from the annular yoke to the tooth part, the distance from the first widening section to the second widening section changes.

[0028] This setting is beneficial to improving the peak torque of the motor, and is beneficial to improving the service performance and market competitiveness of the motor.

[0029] In some embodiments, optionally, Ws, s, and Ds1 satisfy: 0.36×π×(Ds1 / s) ≤ Ws ≤ 0.61×π×(Ds1 / s).

[0030] In this embodiment, the structure of the stator punching sheet is further defined, so that Ws, s, and Ds1 satisfy: 0.36×π×(Ds1 / s) ≤ Ws ≤ 0.61×π×(Ds1 / s).

[0031] That is to say, the size of the stator slot is further defined to optimize the electromagnetic load of the motor, so as to improve the efficiency output of the motor without increasing the volume and material input of the stator, which is beneficial to improving the service performance of the motor.

[0032] In some embodiments, optionally, the outer peripheral wall of the annular yoke is provided with a welding groove and a positioning groove, and the welding groove is used for the installation and positioning of the annular yoke.

[0033] In this embodiment, the structure of the annular yoke is further defined, so that the outer peripheral wall of the annular yoke is provided with a welding groove and a positioning groove, and the welding groove is used for connecting with other components of the motor to achieve the purpose of assembling the stator punching sheet.

[0034] For example, after the stator punching sheets are stacked into a stator core, welding is performed at the welding groove positions.

[0035] After fixing the stator punching sheets through the welding grooves, sufficient internal tensile force can be generated between the stator cores, improving the stiffness of the stator, resisting the deformation of the stator caused by factors such as vibration. Thus, the overall shape of the stator core can be improved, ensuring the balance and consistency of the air gap between the stator core and the rotor core, and enabling the coaxiality of the motor to be controlled within a reasonable range.

[0036] By providing positioning grooves on the outer peripheral wall of the annular yoke, the stator punching sheets are positioned using the positioning grooves. If the positioning grooves are not provided, when installing the stator punching sheets, it is easy to cause the situation of reverse sheets (reverse sheets refer to the reverse installation of adjacent two stator punching sheets). If reverse sheets occur, due to the burrs on the stator punching sheets, it will affect the lamination factor and there is also a risk of scratching the insulating paper of the motor. Therefore, by providing the positioning grooves, the situation of reverse sheets can be prevented.

[0037] In some embodiments, optionally, the number of positioning grooves is at least one; the number of welding grooves is multiple, and the multiple welding grooves are arranged at intervals along the circumferential direction of the stator punching sheet.

[0038] In this embodiment, the mating structure of the positioning grooves and the welding grooves is further defined.

[0039] Among them, the number of positioning grooves is at least one. For example, the number of positioning grooves is one, or for example, the number of positioning grooves is greater than one.

[0040] Among them, the number of welding grooves is multiple, and multiple means greater than or equal to two. The multiple welding grooves are arranged at intervals along the circumferential direction of the stator punching sheet. In this way, the stator punching sheets can be fixed in multiple directions and at multiple angles, ensuring the balance and consistency of the forces at different positions of the stator punching sheets and reducing the probability of deformation of the stator punching sheets.

[0041] In some embodiments, optionally, the stator punching sheet is sectioned along a direction perpendicular to the thickness direction of the stator punching sheet. In the section, the line connecting the midpoint of the bottom of the welding groove and the center of the stator punching sheet is denoted as the connecting line segment. The connecting line segments of any two adjacent welding grooves form an angle a, where 30° ≤ a ≤ 180°.

[0042] In this embodiment, the connecting line segment is defined. Specifically, the stator punching sheet is sectioned along a direction perpendicular to the thickness direction of the stator punching sheet. In the section, the contour line of the bottom of the welding groove has a midpoint, and the line connecting the midpoint of the bottom and the center of the stator punching sheet is the connecting line segment. That is, each welding groove corresponds to a connecting line segment. The connecting line segments of any two adjacent welding grooves form an angle a, the angle a is greater than or equal to 30°, and the angle a is less than or equal to 180°.

[0043] This setting indirectly defines the number of welding grooves.

[0044] In a motor (such as a permanent magnet synchronous motor), if the number of welding slots is excessive, it will increase the die cost, affect the magnetic circuit of the motor, increase the local magnetic density of the punching sheet, increase the iron loss, and affect the efficiency of the motor. In the case of equipped with the same battery, it will affect the cruising range of the whole vehicle.

[0045] In a motor (such as a permanent magnet synchronous motor), if the number of welding slots is too small, during the manufacturing process, the drawing force inside the stator core will be too small. During the manufacturing process, the stator core is prone to cracking, loose sheets, etc., affecting the vibration noise and service life of the motor.

[0046] In some embodiments, optionally, a cross-section is made of the stator punching sheet along a direction perpendicular to the thickness direction of the stator punching sheet. In the cross-section, the length of the bottom of the welding slot is less than the length of the notch of the welding slot.

[0047] In this embodiment, the structure of the welding slot is further defined such that a cross-section is made of the stator punching sheet along a direction perpendicular to the thickness direction of the stator punching sheet. In the cross-section, the length of the bottom of the welding slot is less than the length of the notch of the welding slot. That is, the shape of the welding slot is a trapezoidal groove.

[0048] In some embodiments, optionally, a cross-section is made of the stator punching sheet along a direction perpendicular to the thickness direction of the stator punching sheet. In the cross-section, the contour line of the welding slot includes a convex section and two arc sections. The convex section is connected between the two arc sections, and the connection between the convex section and the arc sections is smoothly transitioned. The arc sections are recessed in a direction away from the outer peripheral wall of the annular yoke, and the convex section protrudes toward the outer peripheral wall of the annular yoke. The protruding height of the convex section is less than the arch height of the arc section.

[0049] In this embodiment, the structure of the welding slot is further defined such that a cross-section is made of the stator punching sheet along a direction perpendicular to the thickness direction of the stator punching sheet. In the cross-section, the contour line of the welding slot includes a convex section and two arc sections. The convex section is located between the two arc sections, and any one of the two arc sections is connected to the convex section. The protruding direction of the convex section is opposite to the recessed direction of the arc section. Specifically, the arc sections are recessed in a direction away from the outer peripheral wall of the annular yoke, and the convex section protrudes toward the outer peripheral wall of the annular yoke.

[0050] In addition, the connection between the convex section and the arc sections is smoothly transitioned. That is to say, the convex section and the two arc sections form a W-shaped structure. It can also be said that the shape of the contour line of the welding slot is W-shaped.

[0051] Specifically, the protruding height of the convex section is less than the arch height of the arc section. The protruding height of the convex section is the distance from the top to the bottom of the protrusion, and the arch height of the arc section is the distance from the open end to the bottom of the arc section. That is, the distance from the top to the bottom of the protrusion is less than the distance from the open end to the bottom of the arc section.

[0052] In some embodiments, optionally, N riveting portions are provided on the axial end face of the annular yoke portion. The riveting portions are located on the bisector of the tooth portion, and the N riveting portions are arranged at intervals along the circumferential direction of the stator punching sheet; wherein, s / N = k, k is a positive integer, and N≥2.

[0053] In this embodiment, the structure of the stator punching sheet is further defined. N riveting portions are provided on the axial end face of the annular yoke portion. The riveting portions are located on the bisector of the tooth portion. The N riveting portions are arranged at intervals along the circumferential direction of the stator punching sheet. The number N of the riveting portions is N≥2, and the ratio k of the number s of the stator slots to the number N of the riveting portions is a positive integer. That is, the number s of the stator slots can divide the number N of the riveting portions.

[0054] Riveting portions are provided on the annular yoke portion of each stator punching sheet. A plurality of stator punching sheets are stacked axially along the stator to form a stator core. The riveting portions on two adjacent stator punching sheets can be matched and cooperated so that the plurality of stator punching sheets are connected to each other axially along the stator, thereby forming a stator core.

[0055] At the same time, the position of the riveting portion is related to the bisector of the tooth portion. Specifically, the riveting portion is located on the bisector of the tooth portion, so as not to affect the magnetic circuit of the annular yoke portion, which is beneficial to improving the torque and working efficiency of the motor. For the stator punching sheet, the number of bisectors of the tooth portion is multiple. The number of riveting portions is N, and each riveting portion needs to be correspondingly arranged on the bisector of the tooth portion.

[0056] A second aspect of the present invention provides a stator, including: a stator core, which is formed by stacking a plurality of stator punching sheets as in the first aspect.

[0057] The stator provided by the present invention includes a stator core formed by stacking the stator punching sheets as in the first aspect. Therefore, it has all the beneficial effects of the above-mentioned stator punching sheet, and will not be elaborated one by one here.

[0058] In some embodiments, optionally, the stator further includes: a plurality of winding portions, the winding portions are arranged in one stator slot, the winding portions include a plurality of winding conductors, and the plurality of winding conductors are arranged along the direction from the annular yoke portion to the tooth portion; the length of the winding conductor in the circumferential direction of the stator is denoted as L1, and the length of the winding conductor in the direction from the tooth portion to the annular yoke portion is denoted as L2, wherein, 1.2≤L1 / L2≤2.5.

[0059] In this embodiment, the stator further includes a plurality of winding portions, and any one of the plurality of winding portions is matched with one stator slot. Specifically, each winding portion is arranged in one stator slot.

[0060] The winding portion includes a plurality of winding conductors, and the plurality of winding conductors are arranged along the direction from the annular yoke portion to the tooth portion.

[0061] The winding conductor is a flat wire. Specifically, the length of the winding conductor along the circumference of the stator is L1, and the length of the winding conductor along the direction from the teeth to the annular yoke is L2. The relationship between L1 and L2 is defined to satisfy 1.2 ≤ L1 / L2 ≤ 2.5.

[0062] A plurality of winding conductors are provided in the stator slots, and the plurality of winding conductors are arranged in the direction from the annular yoke to the tooth portion. The present application defines the relationship between L1 and L2. In particular, in flat wire motors, the size of the flat wire winding conductor is relatively large compared to the size of the round wire winding conductor wound in multiple strands. When AC is passed through the motor, the number of leakage magnetic turns in each part of the cross section of the winding portion along the slot height direction (i.e., the direction from the bottom of the stator slot to the slot opening) is different, which will generate induced electromotive force of different sizes, thereby generating eddy currents, bringing additional eddy current losses, resulting in reduced motor efficiency and increased temperature rise. Therefore, it is necessary to reduce the size of the flat wire winding conductor in the direction from the bottom of the stator slot to the slot opening as much as possible, and to increase the ratio of L1 and L2 of the flat wire winding conductor as much as possible, so that the ratio is within the range of 1.2 to 2.5.

[0063] If L1 / L2>2.5, the processing difficulty and manufacturing cost of the product will increase. Therefore, this application limits the value of L1 / L2 to the range of 1.2 to 2.5. Not only does this reduce the manufacturing and winding process difficulty of the winding part, but the eddy current loss in the winding part is also relatively small, which is conducive to improving the efficiency of the motor.

[0064] A third aspect of the present invention provides a motor, comprising: the stator as in the second aspect.

[0065] The motor provided by the present invention includes the stator as described in the second aspect, and therefore has all the beneficial effects of the above-mentioned stator, which will not be described one by one here.

[0066] A fourth aspect of the present invention provides a power system, comprising: the motor as in the third aspect.

[0067] The power system provided by the present invention includes the motor as in the third aspect, and therefore has all the beneficial effects of the above-mentioned motor, which will not be described one by one here.

[0068] Optionally, the power system includes a motor, a controller, and a reducer. The controller is electrically connected to the motor, which is electrically connected to the reducer, and controls the motor and reducer. The power system can meet the torque and power requirements for the vehicle's forward motion.

[0069] A fifth aspect of the present invention provides a vehicle comprising: the motor as in the third aspect; or the power system as in the fourth aspect.

[0070] The vehicle provided by the present invention includes the motor as in the third aspect or the power system as in the fourth aspect. Therefore, it has all the beneficial effects of the above-mentioned motor or power system, and will not be elaborated one by one here.

[0071] It should be noted that the vehicle can be a new energy vehicle. New energy vehicles include pure electric vehicles, range-extended electric vehicles, hybrid electric vehicles, fuel cell electric vehicles, hydrogen engine vehicles, etc.

[0072] The additional aspects and advantages of the present application will become obvious in the following description part, or can be learned through the practice of the present application. Description of the Drawings

[0073] The above and / or additional aspects and advantages of the present application will become obvious and easy to understand from the description of the embodiments in conjunction with the following drawings, where:

[0074] Figure 1 A schematic diagram of the first part of the stator structure of an embodiment of the present application is shown;

[0075] Figure 2 A schematic diagram of the second part of the stator structure of an embodiment of the present application is shown;

[0076] Figure 3 A schematic diagram of the third part of the stator structure of an embodiment of the present application is shown;

[0077] Figure 4 A schematic diagram of a partial structure of the motor of an embodiment of the present application is shown;

[0078] Figure 5 A data curve diagram showing the change of the total motor loss and motor efficiency of the present application with the change of Wt / Ws is shown;

[0079] Figure 6 A data curve diagram showing the change of the peak torque and total motor loss of the present application with the change of Ys / (Ds2-Ds1) is shown;

[0080] Figure 7 A data curve diagram showing the change of the peak torque and peak power of the present application with the change of (Ws×s) / (π×Ds1) is shown.

[0081] Wherein, Figures 1 to 4 The corresponding relationship between the reference numerals in the drawings and the component names is:

[0082] 1 Motor, 10 Stator punching sheet, 100 Ring-shaped yoke, 110 Welding groove, 112 Protruding section, 114 Arc section, 115 Groove bottom, 116 Groove opening, 120 Positioning groove, 130 Connecting line segment, 200 Tooth part, 210 Tooth body, 220 Tooth boot, 300 Stator slot, 400 First side wall, 500 Second side wall, 600 First widening section, 700 Second widening section, 800 Riveting part, 90 Stator, 900 Stator core, 1000 Winding part, 1010 Winding conductor, 11 Rotor. Detailed implementation manners

[0083] In order to more clearly understand the above objects, features and advantages of the present application, the present application will be further described in detail below with reference to the accompanying drawings and specific implementation manners. It should be noted that, without conflict, the embodiments of the present application and the features in the embodiments may be combined with each other.

[0084] Many specific details are set forth in the following description in order to fully understand the present application. However, the present application may be implemented in other ways different from those described herein. Therefore, the protection scope of the present application is not limited by the specific embodiments disclosed below.

[0085] The following refers to Figures 1 to 7 The stator punching sheet 10, stator 90, motor 1, power system and vehicle according to some embodiments of the present application.

[0086] As Figure 1 And Figure 2 As shown, a stator punching sheet 10 according to some embodiments of the present application includes a ring-shaped yoke 100 including a plurality of tooth parts 200.

[0087] Any one of the plurality of tooth parts 200 is connected to the inner peripheral wall of the ring-shaped yoke 100.

[0088] The plurality of tooth parts 200 are arranged at intervals along the circumferential direction of the stator punching sheet 10.

[0089] The tooth part 200 includes a tooth body 210 and a tooth boot 220.

[0090] The tooth body 210 is connected between the tooth boot 220 and the inner peripheral wall of the ring-shaped yoke 100.

[0091] Adjacent two tooth parts 200 and the ring-shaped yoke 100 enclose a stator slot 300.

[0092] Among adjacent two tooth parts 200, along the circumferential direction of the stator punching sheet 10, the side walls of the two tooth bodies 210 close to each other are respectively denoted as the first side wall 400 and the second side wall 500.

[0093] The first side wall 400 and the second side wall 500 are arranged in parallel.

[0094] Along the circumferential direction of the stator punching sheet 10, the width of the end of the tooth body 210 departing from the annular yoke portion 100 is denoted as Wt, the distance from the first side wall 400 to the second side wall 500 is denoted as Ws, the number of stator slots 300 is denoted as s, and the inner diameter of the stator punching sheet 10 is denoted as Ds1.

[0095] Wherein, 0.47×π×(Ds1 / s) ≤ Wt ≤ 1.45×Ws.

[0096] A stator punching sheet 10 provided in this application includes an annular yoke portion 100 including a plurality of tooth portions 200.

[0097] It can be understood that the annular yoke portion 100 includes an inner peripheral wall and an outer peripheral wall. Along the direction from the tooth portion 200 to the annular yoke portion 100, the inner peripheral wall of the annular yoke portion 100 and the outer peripheral wall of the annular yoke portion 100 are arranged at intervals.

[0098] Any one of the plurality of tooth portions 200 is connected to the inner peripheral wall of the annular yoke portion 100, and the plurality of tooth portions 200 are arranged at intervals along the circumferential direction of the stator punching sheet 10.

[0099] Any one of the plurality of tooth portions 200 includes a tooth body 210 and a tooth shoe 220, and the tooth body 210 is connected between the tooth shoe 220 and the inner peripheral wall of the annular yoke portion 100. Among any two adjacent tooth portions 200, one tooth portion 200 is denoted as the first tooth portion, and the other tooth portion 200 is denoted as the second tooth portion. Along the circumferential direction of the stator punching sheet 10, the side wall of the first tooth portion facing the second tooth portion is denoted as the first side wall 400, and the side wall of the second tooth portion facing the first tooth portion is denoted as the second side wall 500. The first side wall 400 and the second side wall 500 are arranged in parallel.

[0100] Wherein, by defining the mating structure of the first side wall 400 and the second side wall 500, the shape of the tooth body 210 is indirectly defined. For example, along the annular yoke portion 100 to the tooth portion 200, the width of the tooth body 210 in the circumferential direction of the stator punching sheet 10 gradually decreases, so that the use requirements of the parallel arrangement of the first side wall 400 and the second side wall 500 can be met. Optionally, both the first side wall 400 and the second side wall 500 are flat walls; optionally, both the first side wall 400 and the second side wall 500 are curved walls.

[0101] Along the circumference of the stator sheet 10, the width of the end of the tooth body 210 away from the annular yoke 100 is recorded as Wt, the distance from the first side wall 400 to the second side wall 500 is recorded as Ws, the number of stator slots 300 is recorded as s, and the inner diameter of the stator sheet 10 is recorded as Ds1. It can be understood that the tooth tip width Wt of the tooth body 210 and the distance Ws from the first side wall 400 to the second side wall 500 can affect the size of the stator slots 300 of the motor 1 and the saturation degree of the tooth portion 200. In order to ensure a reasonable slot fill rate and current density of the motor 1, it is necessary to reasonably constrain the dimensions of the tooth portion 200 and the stator slots 300 of the stator sheet 10. Excessively large Wt and too small Ws, or both, can lead to improperly designed stator 90 dimensions for motor 1, resulting in oversaturated and undersaturated areas of magnetic flux density. This leads to significant magnetic flux leakage in oversaturated areas, waste of material in undersaturated areas, and inadequate crosslinking between the magnetic fields of rotor 11 and stator 90, hindering the full performance of motor 1. This can also reduce motor 1's output torque, increase harmonic content, create poor back-EMF waveforms, and lower motor efficiency. Furthermore, motor 1's stator 90 lacks sufficient stiffness, resulting in high vibration and noise, significantly increasing the manufacturing cost of motor 1.

[0102] Therefore, to balance the cost and electromagnetic performance of motor 1, it is necessary to rationally match the numerical values of the structure of the teeth 200 and stator slots 300 of the stator laminations 10. This ensures that Wt, Ws, s, and Ds1 satisfy 0.47×π×(Ds1 / s)≤Wt≤1.45×Ws. This reduces magnetic flux leakage within the slots of motor 1 while maintaining the total area of the stator slots 300. This allows for a more rational parameter match between the teeth 200 and stator slots 300, balancing both the production cost and electromagnetic performance of motor 1. This results in a uniform magnetic flux density distribution and minimal magnetic flux leakage, which helps increase the copper content of the windings and improves the material utilization of motor 1. This ensures a reasonable current density for motor 1 without increasing its processing and manufacturing costs, maximizing its output torque and efficiency. Furthermore, the high stiffness of the stator laminations 10 helps improve the vibration and noise of motor 1. In other words, while maintaining a constant production cost, it also ensures the efficiency, peak torque, and peak power output of motor 1.

[0103] In some embodiments, optionally, as Figure 1 and Figure 2 As shown, the annular yoke 100 is a structure of equal ring width.

[0104] The ring width of the annular yoke 100 is represented by Ys.

[0105] The outer diameter of the stator sheet 10 is denoted as Ds2.

[0106] Among them, 0.13≤Ys / (Ds2-Ds1)≤0.25, and 150mm≤Ds2≤270mm.

[0107] In this embodiment, the structure of the stator punching sheet 10 is further defined such that the annular yoke portion 100 has an equal ring width structure. It can be understood that the distance from the inner peripheral wall to the outer peripheral wall of the annular yoke portion 100 is the ring width of the annular yoke portion 100. That is to say, the plurality of tooth portions 200 cooperate with the annular yoke portion 100, and any two adjacent tooth portions 200 and the annular yoke portion 100 enclose a stator slot 300. The distance from the bottom surface 115 of the stator slot 300 to the outer peripheral wall of the annular yoke portion 100 is the ring width of the annular yoke portion 100.

[0108] The ring width of the annular yoke portion 100 affects the magnetic density of the annular yoke portion 100, the size of the stator slot 300, the torque output of the motor 1, and the stiffness of the stator 90. The present application reasonably sets the relationship between Ys, Ds2, and Ds1. On the premise of satisfying the torque output of the motor 1 and the stiffness of the stator 90, the magnetic density of the annular yoke portion 100 of the motor 1 and the space of the stator slot 300 are optimized, which is beneficial to improving the efficiency of the motor 1. Among them, the ring width of the annular yoke portion 100 of the motor 1 is adjusted, and the ring width of the annular yoke portion 100 is limited by the size space of the stator 90 itself, that is, the ring width of the annular yoke portion 100 is restricted by the inner diameter Ds1 of the stator punching sheet 10 and the outer diameter Ds2 of the stator punching sheet 10. For this reason, the present application defines 0.13 ≤ Ys / (Ds2 - Ds1) ≤ 0.25, and 150 mm ≤ Ds2 ≤ 270 mm. It is possible to reasonably allocate the radial ratio of the stator slot 300 and the annular yoke portion 100 under the condition of limited stator 90 size. On the premise of taking into account the cost and electromagnetic performance of the motor 1, the output torque and efficiency of the motor 1 are maximized, and this structural setting makes the stator punching sheet 10 have better stiffness, which is beneficial to improving the vibration and noise of the motor 1.

[0109] Among them, the equal ring width structure means that the ring widths at different positions of the annular yoke portion 100 are equal.

[0110] In some embodiments, optionally, as Figure 2 shown, among two adjacent tooth portions 200, along the circumferential direction of the stator punching sheet 10, the side walls of the two tooth boots 220 close to each other are respectively denoted as a first widening section 600 and a second widening section 700.

[0111] From the annular yoke portion 100 to the tooth portion 200, the distance from the first widening section 600 to the second widening section 700 gradually decreases.

[0112] In this embodiment, the cooperation structure of the plurality of tooth portions 200 of the stator punching sheet 10 is further defined.

[0113] The tooth boots 220 of two adjacent tooth parts 200 are respectively denoted as the first tooth boot 220 and the second tooth boot 220. Along the circumferential direction of the stator punching 10, the side wall of the first tooth boot 220 facing the second tooth boot 220 is denoted as the first widening section 600, and the side wall of the second tooth boot 220 facing the first tooth boot 220 is denoted as the second widening section 700.

[0114] It can be understood that the first side wall 400 is connected to the first widening section 600, and the second side wall 500 is connected to the second widening section 700.

[0115] Wherein, along the annular yoke 100 to the tooth part 200, the distance from the first widening section 600 to the second widening section 700 gradually decreases, that is, along the annular yoke 100 to the tooth part 200, the distance from the first widening section 600 to the second widening section 700 changes.

[0116] This setting is beneficial to improving the peak torque of the motor 1 and is beneficial to improving the service performance and market competitiveness of the motor 1.

[0117] In some embodiments, optionally, Ws, s, and Ds1 satisfy: 0.36×π×(Ds1 / s) ≤ Ws ≤ 0.61×π×(Ds1 / s).

[0118] In this embodiment, the structure of the stator punching 10 is further defined such that Ws, s, and Ds1 satisfy: 0.36×π×(Ds1 / s) ≤ Ws ≤ 0.61×π×(Ds1 / s).

[0119] That is to say, the size of the stator slot 300 is further defined to optimize the electromagnetic load of the motor 1, so as to improve the efficiency output of the motor 1 without increasing the volume and material input of the stator 90, which is beneficial to improving the service performance of the motor 1.

[0120] Optionally, Ws = 0.38×π×(Ds1 / s), Ws = 0.4×π×(Ds1 / s), Ws = 0.43×π×(Ds1 / s), Ws = 0.45×π×(Ds1 / s), Ws = 0.48×π×(Ds1 / s), Ws = 0.5×π×(Ds1 / s), Ws = 0.52×π×(Ds1 / s), Ws = 0.55×π×(Ds1 / s), and Ws = 0.58×π×(Ds1 / s), etc., which are not listed one by one here.

[0121] In some embodiments, optionally, as Figure 1 shown, the outer peripheral wall of the annular yoke 100 is provided with a welding groove 110 and a positioning groove 120.

[0122] The welding groove 110 is used for the installation and positioning of the annular yoke 100.

[0123] In this embodiment, the structure of the annular yoke portion 100 is further defined such that a welding groove 110 and a positioning groove 120 are provided on the outer peripheral wall of the annular yoke portion 100. The welding groove 110 is used to connect with other components of the motor 1 to achieve the purpose of assembling the stator punching 10.

[0124] For example, after the stator punchings 10 are stacked into the stator core 900, welding is performed at the position of the welding groove 110.

[0125] After fixing the stator punchings 10 through the welding groove 110, sufficient internal tension can be generated between the stator cores 900, improving the stiffness of the stator 90, resisting the deformation of the stator 90 caused by factors such as vibration. Thereby, the overall shape of the stator core 900 can be improved, ensuring the balance and consistency of the air gap between the stator core 900 and the rotor 11 core, and enabling the coaxiality of the motor 1 to be controlled within a reasonable range.

[0126] By providing the positioning groove 120 on the outer peripheral wall of the annular yoke portion 100, the stator punchings 10 are positioned using the positioning groove 120. If the positioning groove 120 is not provided, when installing the stator punchings 10, it is easy to cause the situation of reverse laminations (reverse laminations refer to the reverse installation of two adjacent stator punchings 10). If reverse laminations occur, due to the burrs on the stator punchings 10, it will affect the stacking factor and there is a risk of scratching the insulating paper of the motor 1. Therefore, by providing the positioning groove 120, the situation of reverse laminations can be prevented.

[0127] In some embodiments, optionally, the number of the positioning grooves 120 is at least one; the number of the welding grooves 110 is multiple, and the multiple welding grooves 110 are arranged at intervals along the circumferential direction of the stator punching 10.

[0128] In this embodiment, the matching structure of the positioning groove 120 and the welding groove 110 is further defined.

[0129] Among them, the number of the positioning grooves 120 is at least one. For example, the number of the positioning grooves 120 is one, or for example, the number of the positioning grooves 120 is more than one.

[0130] Among them, the number of the welding grooves 110 is multiple, and multiple means greater than or equal to two. The multiple welding grooves 110 are arranged at intervals along the circumferential direction of the stator punching 10. In this way, the stator punchings 10 can be fixed in multiple directions and at multiple angles, ensuring the balance and consistency of the forces at different positions of the stator punchings 10 and reducing the probability of deformation of the stator punchings 10.

[0131] In some embodiments, optionally, as Figure 2 shown, the stator punching 10 is sectioned along the thickness direction perpendicular to the stator punching 10. In the section, the line connecting the midpoint of the bottom 115 of the welding groove 110 and the center of the stator punching 10 is denoted as the connecting line segment 130.

[0132] The connecting line segment 130 between any two adjacent welding grooves 110 forms an included angle a, where 30° ≤ a ≤ 180°.

[0133] In this embodiment, the connecting line segment 130 is defined. Specifically, the stator punching sheet 10 is sectioned along the thickness direction perpendicular to the stator punching sheet 10. In the section, the contour line of the bottom 115 of the welding groove 110 has a midpoint, and the connecting line between the midpoint of the bottom 115 of the welding groove 110 and the center of the stator punching sheet 10 is the connecting line segment 130. That is, each welding groove 110 corresponds to a connecting line segment 130. The connecting line segments 130 between any two adjacent welding grooves 110 form an included angle a, the included angle a is greater than or equal to 30°, and the included angle a is less than or equal to 180°.

[0134] This setting indirectly limits the number of welding grooves 110.

[0135] In the motor 1 (such as, a permanent magnet synchronous motor), if the number of welding grooves 110 is too large, it will increase the die cost, affect the magnetic circuit of the motor 1, increase the local magnetic density of the punching sheet, increase the iron loss, and affect the efficiency of the motor 1. In the case of being equipped with the same battery, it will affect the cruising range of the whole vehicle.

[0136] In the motor 1 (such as, a permanent magnet synchronous motor), if the number of welding grooves 110 is too small, during the production and manufacturing process, the drawing force inside the stator core 900 will be too small. During the manufacturing process, the stator core 900 is prone to cracking, sheet separation, etc., affecting the vibration noise and service life of the motor 1.

[0137] In some embodiments, optionally, the stator punching sheet 10 is sectioned along the thickness direction perpendicular to the stator punching sheet 10. In the section, the length of the bottom 115 of the welding groove 110 is less than the length of the notch 116 of the welding groove 110.

[0138] In this embodiment, the structure of the welding groove 110 is further limited, such that the stator punching sheet 10 is sectioned along the thickness direction perpendicular to the stator punching sheet 10. In the section, the length of the bottom 115 of the welding groove 110 is less than the length of the notch 116 of the welding groove 110. That is, the shape of the welding groove 110 is a trapezoidal groove.

[0139] In some embodiments, optionally, as Figure 3 shown, the stator punching sheet 10 is sectioned along the thickness direction perpendicular to the stator punching sheet 10. In the section, the contour line of the welding groove 110 includes a protruding section 112 and two arc sections 114.

[0140] The protruding section 112 is connected between the two arc sections 114.

[0141] The connection between the protruding section 112 and the arc section 114 has a smooth transition.

[0142] The arc segment 114 is recessed in a direction away from the outer peripheral wall of the annular yoke portion 100, and the convex segment 112 protrudes toward the outer peripheral wall of the annular yoke portion 100.

[0143] The protruding height of the convex segment 112 is less than the arch height of the arc segment 114.

[0144] In this embodiment, the structure of the welding groove 110 is further defined such that when a cross-section of the stator punching 10 is taken in a direction perpendicular to the thickness direction of the stator punching 10, in the cross-section, the contour line of the welding groove 110 includes a convex segment 112 and two arc segments 114. The convex segment 112 is located between the two arc segments 114, and any one of the two arc segments 114 is connected to the convex segment 112. The protruding direction of the convex segment 112 is opposite to the recessed direction of the arc segment 114. Specifically, the arc segment 114 is recessed in a direction away from the outer peripheral wall of the annular yoke portion 100, and the convex segment 112 protrudes toward the outer peripheral wall of the annular yoke portion 100.

[0145] In addition, the connection between the convex segment 112 and the arc segment 114 is smoothly transitioned. That is to say, the convex segment 112 and the two arc segments 114 form a W-shaped structure. It can also be said that the shape of the contour line of the welding groove 110 is W-shaped.

[0146] Specifically, the protruding height of the convex segment 112 is less than the arch height of the arc segment 114. The protruding height of the convex segment 112 is the distance from the top to the bottom of the protrusion, and the arch height of the arc segment 114 is the distance from the open end to the bottom of the arc segment 114. That is, the distance from the top to the bottom of the protrusion is less than the distance from the open end to the bottom of the arc segment 114.

[0147] In some embodiments, optionally, as Figure 1 shown, N riveting portions 800 are provided on the axial end face of the annular yoke portion 100.

[0148] The riveting portions 800 are located on the bisector of the tooth portion 200, and the N riveting portions 800 are arranged at intervals along the circumferential direction of the stator punching 10.

[0149] Wherein, s / N = k, k is a positive integer, and N≥2.

[0150] In this embodiment, the structure of the stator punching 10 is further defined. N riveting portions 800 are provided on the axial end face of the annular yoke portion 100. The riveting portions 800 are located on the bisector of the tooth portion 200. The N riveting portions 800 are arranged at intervals along the circumferential direction of the stator punching 10. The number N of the riveting portions 800 is N≥2, and the ratio k of the number s of the stator slots 300 to the number N of the riveting portions 800 is a positive integer. That is, the number s of the stator slots 300 can divide the number N of the riveting portions 800.

[0151] On the annular yoke portion 100 of each stator punching 10, there is a riveting portion 800. A plurality of stator punchings 10 are stacked along the axial direction of the stator 90 to form a stator core 900. The riveting portions 800 on two adjacent stator punchings 10 can be fitted together so that the plurality of stator punchings 10 are connected to each other in the axial direction of the stator 90, thereby forming the stator core 900.

[0152] Meanwhile, the position of the riveting portion 800 has a correlation with the bisector of the tooth portion 200. Specifically, the riveting portion 800 is located on the bisector of the tooth portion 200, so as not to affect the magnetic circuit of the annular yoke portion 100, which is beneficial to improving the torque and working efficiency of the motor 1. For the stator punching 10, the number of bisectors of the tooth portion 200 is multiple. The number of riveting portions 800 is N, and each riveting portion 800 needs to be correspondingly arranged on the bisector of the tooth portion 200.

[0153] As Figure 2 shown, a stator 90 according to some other embodiments of the present application includes: a stator core 900, which is formed by stacking a plurality of stator punchings 10 as in any of the above embodiments.

[0154] The stator 90 provided by the present invention includes a stator core 900 formed by stacking stator punchings 10 as in any of the above embodiments. Therefore, it has all the beneficial effects of the above stator punchings 10, which will not be elaborated one by one here.

[0155] In some embodiments, optionally, as Figure 1 and Figure 2 shown, the stator 90 further includes a plurality of winding portions 1000.

[0156] Any one of the plurality of winding portions 1000 is arranged in a stator slot 300.

[0157] The winding portion 1000 includes a plurality of winding conductors 1010.

[0158] The plurality of winding conductors 1010 are arranged in the direction from the annular yoke portion 100 to the tooth portion 200.

[0159] The length of the winding conductor 1010 in the circumferential direction of the stator 90 is denoted as L1.

[0160] The length of the winding conductor 1010 in the direction from the tooth portion 200 to the annular yoke portion 100 is denoted as L2.

[0161] Among them, 1.2 ≤ L1 / L2 ≤ 2.5.

[0162] In this embodiment, the stator 90 further includes a plurality of winding portions 1000, and any one of the plurality of winding portions 1000 is matched with a stator slot 300. Specifically, each winding portion 1000 is arranged in a stator slot 300.

[0163] The winding portion 1000 includes a plurality of winding conductors 1010 , which are arranged in a direction from the annular yoke portion 100 to the teeth portion 200 .

[0164] The winding conductor 1010 is a flat wire. Specifically, the length of the winding conductor 1010 along the circumference of the stator 90 is L1, and the length of the winding conductor 1010 along the direction from the teeth 200 to the annular yoke 100 is L2. The relationship between L1 and L2 is defined to satisfy 1.2 ≤ L1 / L2 ≤ 2.5.

[0165] A plurality of winding conductors 1010 are provided in the stator slots 300, and the plurality of winding conductors 1010 are arranged in a direction from the annular yoke 100 to the tooth portion 200. The present application defines the relationship between L1 and L2. In particular, in flat wire motors, the size of the flat wire winding conductor 1010 is relatively large compared to the size of the multi-stranded round wire winding conductor 1010. When AC is passed through the motor 1, the number of leakage magnetic turns in each cross-section of the winding portion 1000 along the slot height direction (i.e., from the slot bottom 115 to the slot opening 116 of the stator slot 300) is different, resulting in induced potentials of different magnitudes, thereby generating eddy currents, resulting in additional eddy current losses, and causing reduced motor efficiency and increased temperature rise. Therefore, it is necessary to minimize the size of the flat wire winding conductor 1010 in the direction from the slot bottom 115 to the slot opening 116 of the stator slot 300 and maximize the ratio of L1 to L2 of the flat wire winding conductor 1010 so that the ratio is within the range of 1.2 to 2.5.

[0166] If L1 / L2>2.5, the processing difficulty and manufacturing cost of the product will increase. Therefore, this application limits the value of L1 / L2 to a range of 1.2 to 2.5. This not only reduces the manufacturing and winding process difficulty of the winding portion 1000, but also reduces the eddy current loss in the winding portion 1000, which is beneficial to improving the efficiency of the motor 1.

[0167] like Figure 4 As shown, a motor 1 according to some further embodiments of the present application includes: a stator 90 as in any of the above embodiments.

[0168] The motor 1 provided by the present invention includes the stator 90 as in any of the above embodiments, and therefore has all the beneficial effects of the above stator 90, which will not be described one by one here.

[0169] According to some further embodiments of the present application, a power system includes: the motor 1 as in the above embodiment.

[0170] The power system provided by the present invention includes the motor 1 as in any of the above embodiments, and therefore has all the beneficial effects of the above motor 1, which will not be described one by one here.

[0171] Optionally, the power system includes a motor 1, a controller, and a speed reducer. The controller is electrically connected to the motor 1 and the speed reducer, and the controller controls the operation of the motor 1 and the speed reducer. The power system can meet the usage requirements of torque and power for the vehicle to move forward.

[0172] A vehicle according to some other embodiments of the present application includes the motor 1 or the power system in the above embodiments.

[0173] The vehicle provided by the present invention includes the motor 1 or the power system in any of the above embodiments, and thus has all the beneficial effects of the above motor 1 or power system, which will not be elaborated one by one here.

[0174] It should be noted that the vehicle can be a new energy vehicle. New energy vehicles include pure electric vehicles, range-extended electric vehicles, hybrid electric vehicles, fuel cell electric vehicles, hydrogen engine vehicles, etc.

[0175] As Figure 1 shown, the present application proposes a stator punching sheet 10. The stator punching sheet 10 is sheet-shaped and includes an annular yoke portion 100 and tooth portions 200. The annular yoke portion 100 is annular, and a welding groove 110 and a positioning groove 120 for positioning the stator core 900 are provided on the outer peripheral wall of the annular yoke portion 100. The number of the positioning grooves 120 is only one, and the number of the welding grooves 110 is multiple. The multiple welding grooves 110 are evenly and spaced along the outer peripheral side of the annular yoke portion 100. After the stator punching sheets 10 are stacked into the stator core 900, welding is performed at the position of the welding groove 110.

[0176] It can generate sufficient internal tensile force between the stator cores 900, improve the stiffness of the stator 90, resist the deformation of the stator 90 caused by factors such as vibration, thereby improving the overall shape of the stator core 900, ensuring the uniformity of the air gap length between the stator and rotor 11 cores, and controlling the coaxiality of the motor 1 within a reasonable range. The function of the positioning groove 120 is to position the stator punching sheet 10. If the positioning groove 120 is not provided, it is easy to cause reverse sheets (adjacent two stator punching sheets 10 are installed reversely) when installing the stator punching sheet 10. If reverse sheets occur, due to the burrs on the stator punching sheet 10, it will affect the lamination factor and there is a risk of scratching the insulating paper.

[0177] A plurality of tooth portions 200 are provided on the annular yoke portion 100 and are arranged at intervals along the circumferential direction of the annular yoke portion 100. The circumferential width of the tooth body 210 of the stator 90 teeth gradually decreases from the tooth root to the tooth tip (equivalent to the direction from the annular yoke portion 100 to the tooth portion 200), so that a stator slot 300 with a parallel structure is formed between the annular yoke portion 100 and two adjacent tooth portions 200. A plurality of winding conductors 1010 arranged radially are provided in each stator slot 300. The tooth tip width of the stator 90 teeth is Wt, the slot width of the stator slot 300 is Ws, and 0.47×π×(Ds1 / s)≤Wt≤1.45×Ws is satisfied between Wt and Ws. Where s is the number of stator slots 300, and Ds1 is the inner diameter of the stator punching 10. For the parallel slot structure used for the flat wire type winding conductor 1010, the tooth tip width of the tooth body 210 and the width of the stator slot 300 directly determine the size of the stator slot 300 of the motor 1 and the saturation degree of the tooth portion 200. In order to ensure a reasonable slot fill factor and current density of the motor 1, it is necessary to reasonably constrain the sizes of the tooth portion 200 and the stator slot 300 of the motor 1. An excessively large tooth portion 200 width and an excessively small stator slot 300 width, or an excessively small tooth portion 200 width and an excessively large slot width will result in an unreasonable design of the stator 90 size, with oversaturated and undersaturated regions in the magnetic density design, large magnetic leakage in the oversaturated magnetic density region, material waste in the undersaturated magnetic density region, resulting in insufficient linkage between the rotor 11 magnetic field and the stator 90 magnetic field, the performance of the motor 1 not being fully exerted, low output torque of the motor 1, high harmonic content of the motor 1, poor back electromotive force waveform, low motor efficiency, insufficient stiffness of the stator 90 of the motor 1, and large vibration and noise. At the same time, it leads to an increase in the manufacturing cost of the motor 1. In order to balance the cost of the motor 1 and the electromagnetic performance of the motor 1, it is necessary to reasonably match the widths of the tooth portion 200 and the stator slot 300 of the motor 1.

[0178] Making Wt, Ws, s and Ds1 satisfy 0.47×π×(Ds1 / s)≤Wt≤1.45×Ws not only realizes reducing the slot leakage magnetic of the motor 1 while keeping the total area of the stator slot 300 unchanged, making the parameters of the tooth portion 200 and the stator slot 300 more reasonably matched, balancing the cost of the motor 1 and the electromagnetic performance of the motor 1, with uniform magnetic density distribution, small magnetic leakage, high copper occupancy ratio of the winding, high material utilization rate of the motor 1, without increasing the processing and manufacturing cost of the motor 1 while ensuring a reasonable current density of the motor 1, maximizing the output torque and efficiency of the motor 1, and the stator punching 10 has good stiffness, which is beneficial to improving the vibration and noise of the motor 1. Without the need to increase the material usage or volume envelope, it balances the motor efficiency, peak torque and peak power, is beneficial to improving the service performance of the product, and is beneficial to reducing the production cost of the product.

[0179] Specifically, taking the 8-pole 48-slot motor 1 as an example, the total number of slots of the motor 1 is s = 48, and the inner diameter Ds1 of the stator 90 of the motor 1 is 121 mm. Then, 0.47×π×(Ds1 / s) ≤ Wt ≤ 1.45×Ws. Here, 0.47×π×(Ds1 / s) = 3.72 mm. Thus, the tooth top width Wt of the tooth body 210 of the motor 1 satisfies 3.72 ≤ Wt ≤ 1.45×Ws. Under the configuration of the dimension parameters of the motor 1, Figure 5 shows a waveform diagram of the total loss of the motor and the motor efficiency varying with the ratio of the tooth top width Wt of the tooth body 210 and the width of the stator slot 300 (i.e., the distance from the first side wall 400 to the second side wall 500) Ws at the rated speed torque operating point. Among them, B1 represents the total loss of the motor, and B2 represents the motor efficiency. From Figure 5 it can be seen that when 0.47×π×(Ds1 / s) ≤ Wt ≤ 1.45×Ws is satisfied between Wt and Ws, the total loss of the motor 1 is relatively the smallest, and the output efficiency of the motor 1 is the highest, which is beneficial to improving the cruising range of the electric vehicle.

[0180] As Figure 2 shown, the annular yoke 100 is an equal-width annular structure. The ring width Ys of the annular yoke 100, the inner diameter Ds1 of the stator punch 10, and the outer diameter Ds2 of the stator punch 10 satisfy 0.13 ≤ Ys / (Ds2 - Ds1) ≤ 0.25, where 150 mm ≤ Ds2 ≤ 270 mm. The multiple tooth parts 200 of the stator 90 cooperate with the annular yoke 100. The annular yoke 100 and two adjacent tooth parts 200 enclose the stator slot 300. The bottom surface 115 of the stator slot 300 and the outer peripheral surface of the annular yoke 100 form the ring width of the annular yoke 100. The ring width of the annular yoke 100 directly determines the magnetic density of the annular yoke 100, the size of the stator slot 300, the torque output of the motor 1, and the stiffness of the stator 90. In order to optimize the magnetic density of the annular yoke 100 of the motor 1 and the space of the stator slot 300 and improve the motor efficiency on the premise of meeting the torque output of the motor 1 and the stiffness of the stator 90, it is necessary to adjust the ring width of the annular yoke 100 of the motor 1. And the size of the width of the annular yoke 100 is restricted by the size space of the stator 90 itself, that is, restricted by the inner diameter Ds1 of the stator punch 10 and the outer diameter Ds2 of the stator punch 10. Therefore, in this application, making Ys, Ds1, and Ds2 satisfy 0.13 ≤ Ys / (Ds2 - Ds1) ≤ 0.25 can reasonably allocate the radial ratio of the stator slot 300 and the annular yoke 100 under the limited size of the stator 90. On the premise of taking into account the cost of the motor 1 and the electromagnetic performance of the motor 1, the output torque and efficiency of the motor 1 are maximized, and the stator punch 10 has good stiffness, which is beneficial to improving the vibration and noise of the motor 1.

[0181] Figure 6In the motor 1 with 48 slots and 8 poles as an example, the waveform diagrams of the peak torque of the motor 1 and the total loss of the motor varying with the ratio of Ys / (Ds2 - Ds1) are shown. Among them, B3 represents the peak torque, and B4 represents the total loss of the motor. It can be seen from the figure that when Ys, Ds1, and Ds2 satisfy 0.13 ≤ Ys / (Ds2 - Ds1) ≤ 0.25, the peak torque of the motor 1 is relatively high, and the total loss of the motor is relatively minimal. Under the condition that the peak output performance of the motor 1 can be satisfied, the motor efficiency is improved, the short-time operation time under the peak condition of the motor 1 is increased, and the electric vehicle has good acceleration, climbing, and endurance performance.

[0182] As Figure 2 shown, the distance Ws from the first side wall 400 to the second side wall 500 of the stator 90, the inner diameter Ds1 of the stator punch 10, and the number s of the stator slots 300 satisfy 0.36×π×(Ds1 / s) ≤ Ws ≤ 0.61×π×(Ds1 / s), which can further restrict the size of the stator slots 300, optimize the electromagnetic load of the motor 1, and thus maximize the efficiency output of the motor 1 without increasing the material usage or volume envelope.

[0183] Figure 7 In the motor 1 with 48 slots and 8 poles as an example, the waveform diagrams of the peak torque and peak power of the motor 1 varying with (Ws×s) / (π×Ds1) are shown. Among them, B5 represents the peak torque, and B6 represents the peak power. From Figure 7 it can be seen that when Ws, s, and Ds1 satisfy: 0.36×π×(Ds1 / s) ≤ Ws ≤ 0.61×π×(Ds1 / s), the peak torque and peak power of the motor 1 are relatively higher in output. Thus, without increasing the material usage or volume envelope, the maximization of both peak torque and peak power output is taken into account, which is beneficial to improving the performance of the motor 1 and saving costs.

[0184] Optionally, as Figure 4 shown, the motor 1 includes a stator 90 and a rotor 11, and the rotor 11 is rotatably connected to the stator 90.

[0185] The stator punch 10 includes an annular yoke portion 100 including a plurality of tooth portions 200.

[0186] It can be understood that the annular yoke portion 100 includes an inner peripheral wall and an outer peripheral wall. Along the direction from the tooth portion 200 to the annular yoke portion 100, the inner peripheral wall and the outer peripheral wall of the annular yoke portion 100 are arranged at intervals.

[0187] Any one of the plurality of tooth portions 200 is connected to the inner peripheral wall of the annular yoke portion 100, and the plurality of tooth portions 200 are arranged at intervals along the circumferential direction of the stator punch 10.

[0188] Each of the multiple tooth sections 200 includes a tooth body 210 and a tooth shoe 220. The tooth body 210 is connected between the tooth shoe 220 and the inner circumferential wall of the annular yoke 100. Of any two adjacent tooth sections 200, one tooth section 200 is designated as a first tooth section, and the other tooth section 200 is designated as a second tooth section. Along the circumference of the stator sheet 10, the side wall of the first tooth section facing the second tooth section is designated as a first side wall 400, and the side wall of the second tooth section facing the first tooth section is designated as a second side wall 500. The first side wall 400 and the second side wall 500 are arranged in parallel.

[0189] The shape of the tooth body 210 is indirectly defined by defining the mating structure of the first sidewall 400 and the second sidewall 500. For example, the width of the tooth body 210 in the circumferential direction of the stator sheet 10 gradually decreases from the annular yoke 100 to the tooth portion 200. This satisfies the requirement for parallel arrangement of the first sidewall 400 and the second sidewall 500. Optionally, both the first sidewall 400 and the second sidewall 500 are planar walls; alternatively, both the first sidewall 400 and the second sidewall 500 are curved walls.

[0190] Along the circumference of the stator sheet 10, the width of the end of the tooth body 210 away from the annular yoke 100 is recorded as Wt, the distance from the first side wall 400 to the second side wall 500 is recorded as Ws, the number of stator slots 300 is recorded as s, and the inner diameter of the stator sheet 10 is recorded as Ds1. It can be understood that the tooth tip width Wt of the tooth body 210 and the distance Ws from the first side wall 400 to the second side wall 500 can affect the size of the stator slots 300 of the motor 1 and the saturation degree of the tooth portion 200. In order to ensure a reasonable slot fill rate and current density of the motor 1, it is necessary to reasonably constrain the dimensions of the tooth portion 200 and the stator slots 300 of the stator sheet 10. Excessively large Wt and too small Ws, or both, can lead to improperly designed stator 90 dimensions for motor 1, resulting in oversaturated and undersaturated areas of magnetic flux density. This leads to significant magnetic flux leakage in oversaturated areas, waste of material in undersaturated areas, and inadequate crosslinking between the magnetic fields of rotor 11 and stator 90, hindering the full performance of motor 1. This can also reduce motor 1's output torque, increase harmonic content, create poor back-EMF waveforms, and lower motor efficiency. Furthermore, motor 1's stator 90 lacks sufficient stiffness, resulting in high vibration and noise, significantly increasing the manufacturing cost of motor 1.

[0191] Therefore, in order to balance the cost of the motor 1 and the electromagnetic performance of the motor 1, it is necessary to perform a reasonable numerical matching on the tooth part 200 of the stator punching 10 and the structure of the stator slot 300. Make Wt, Ws, s, and Ds1 satisfy Wt > Ds1 / s and Ds1 / s < Ws. In this way, while keeping the total area of the stator slot 300 unchanged, the slot leakage magnetic field of the motor 1 can be reduced, the parameter matching between the tooth part 200 and the stator slot 300 can be made more reasonable, the production cost of the motor 1 and the electromagnetic performance of the motor 1 are balanced, the magnetic density distribution is uniform, and the leakage magnetic field is small, which is beneficial to increasing the copper ratio of the winding and improving the material utilization rate of the motor 1. While ensuring that the motor 1 has a reasonable current density, the manufacturing cost of the motor 1 is not increased, and the output torque and efficiency of the motor 1 are maximized. Moreover, the stator punching 10 has good stiffness, which is beneficial to improving the vibration and noise of the motor 1. That is to say, while not increasing the production cost of the motor 1, the efficiency, peak torque, and peak power output of the motor 1 are balanced.

[0192] In this application, the term "a plurality of" means two or more, unless otherwise clearly defined. Terms such as "mounted", "connected", "connected to", "fixed" and the like should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; "connected" can be a direct connection or an indirect connection through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0193] In the description of this specification, the descriptions of terms such as "one embodiment", "some embodiments", "specific embodiments" and the like mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of this application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. The above is only the preferred embodiment of this application and is not used to limit this application. For those skilled in the art, this application can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of this application shall be included in the protection scope of this application.

Claims

1. A stator punching sheet, characterized in that, include: annular yoke; a plurality of teeth, each of the plurality of teeth being spaced apart along the circumference of the stator punching sheet, each of the teeth comprising a tooth body and a tooth shoe, the tooth body being connected between the tooth shoe and the inner circumferential wall of the annular yoke, and two adjacent teeth and the annular yoke enclosing a stator slot; In two adjacent tooth portions, along the circumferential direction of the stator punching sheet, the side walls of the two tooth bodies close to each other are respectively recorded as the first side wall and the second side wall, and the first side wall and the second side wall are arranged in parallel; Along the circumference of the stator punching sheet, the width of the end of the tooth body away from the annular yoke is recorded as Wt, the distance from the first side wall to the second side wall is recorded as Ws, the number of the stator slots is recorded as s, and the inner diameter of the stator punching sheet is recorded as Ds1, wherein 0.47×π×(Ds1 / s)≤Wt≤1.45×Ws.

2. The stator punching sheet according to claim 1, characterized in that, The annular yoke is a structure of equal ring width, the ring width of the annular yoke is denoted as Ys, and the outer diameter of the stator punching sheet is denoted as Ds2, wherein 0.13≤Ys / (Ds2-Ds1)≤0.25, and 150mm≤Ds2≤270mm.

3. The stator punching sheet according to claim 1 or 2, characterized in that, In two adjacent tooth portions, along the circumferential direction of the stator sheet, the side walls of the two tooth shoes close to each other are respectively recorded as the first widened section and the second widened section; Along the annular yoke portion to the tooth portion, the distance from the first widening section to the second widening section gradually decreases.

4. The stator punching sheet according to claim 1 or 2, characterized in that, Ws, s and Ds1 satisfy: 0.36×π×(Ds1 / s)≤Ws≤0.61×π×(Ds1 / s).

5. The stator punching sheet according to claim 1 or 2, characterized in that, The outer peripheral wall of the annular yoke is provided with a welding groove and a positioning groove, and the welding groove is used for installation and positioning of the annular yoke.

6. The stator punching sheet according to claim 5, wherein The number of the positioning groove is at least one; There are multiple welding grooves, and the multiple welding grooves are arranged at intervals along the circumferential direction of the stator punching sheet.

7. The stator punching sheet according to claim 6, characterized in that, The stator punching sheet is cross-sectioned along a direction perpendicular to the thickness of the stator punching sheet. In the cross-section, the line connecting the midpoint of the groove bottom of the welding groove and the center of the stator punching sheet is recorded as a connecting line segment. The connecting line segments of any two adjacent welding grooves form an angle a, where 30°≤a≤180°.

8. The stator punching sheet according to claim 5, wherein, The stator punching sheet is cross-sectioned along a direction perpendicular to the thickness of the stator punching sheet. In the cross-section, the length of the bottom of the welding slot is smaller than the length of the slot opening of the welding slot.

9. The stator punching sheet according to claim 5, characterized in that, The stator punching sheet is cross-sectioned along a direction perpendicular to the thickness of the stator punching sheet. In the cross-section, the contour line of the welding groove includes a raised segment and two arc segments, the raised segment is connected between the two arc segments, and the connection between the raised segment and the arc segments has a smooth transition. The arc segment is recessed in the direction away from the outer peripheral wall of the annular yoke, and the raised segment is raised toward the outer peripheral wall of the annular yoke. The raised height of the raised segment is less than the arch height of the arc segment.

10. The stator punching sheet according to claim 1 or 2, characterized in that, The axial end surface of the annular yoke is provided with N rivet buckles, the rivet buckles are located on the bisector of the tooth portion, and the N rivet buckles are arranged at intervals along the circumference of the stator punching sheet; Wherein, s / N=k, k is a positive integer, and N≥2.

11. A stator, characterized in that, include: The stator core is formed by stacking a plurality of stator laminations as described in any one of claims 1 to 10.

12. The stator according to claim 11, characterized in that, Further comprising: A plurality of winding portions, the winding portions are disposed in one of the stator slots, the winding portions include a plurality of winding conductors, and the plurality of winding conductors are arranged in a direction from the annular yoke portion to the tooth portion; The length of the winding conductor in the circumferential direction of the stator is denoted as L1, and the length of the winding conductor in the direction from the tooth portion to the annular yoke portion is denoted as L2, wherein 1.2 ≤ L1 / L2 ≤ 2.

5.

13. A motor, characterized in that, Comprising: The stator as described in claim 11 or 12.

14. A power system, characterized in that, Comprising: The motor as described in claim 13.

15. A vehicle, characterized in that, Comprising: The motor as described in claim 13; Or The power system as described in claim 14.

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