Stator lamination, stator, electric machine, braking system and vehicle

Abstract

This application provides a stator lamination, a stator, a motor, a braking system, and a vehicle. The stator lamination includes: multiple lamination units, each lamination unit comprising a yoke and teeth, the teeth of the multiple lamination units enclosing a mounting cavity; the outer peripheral wall of the yoke has a positioning groove and two recesses, the positioning groove being located between the two recesses, and the recesses of any two adjacent lamination units being joined together to form a connecting groove; the teeth include a tooth body and a tooth shoe, the tooth body connecting the tooth shoe and the yoke; on the axial end face of the yoke, the circumferential width of the positioning groove is b1, the circumferential width of the recess is b2, and the circumferential width of the tooth body is bst; on the axial end face of the yoke, from the yoke to the teeth, the depth of the positioning groove is h1, the depth of the recess is h2, and the thickness of the yoke is bsy; wherein (b1+2×b2)×(h1+h2)<bst 2 +bsy 2 This application balances the effectiveness of stator lamination assembly with the performance of the motor.

Description

Technical Field

[0001] This application relates to the field of motor technology, and more specifically, to a stator lamination, a stator, a motor, a braking system, and a vehicle. Background Technology

[0002] As a power source for electrical appliances or various mechanical equipment, an electric motor can generate driving torque when it is working.

[0003] In related technologies, motors include multiple stacked stator laminations, each stator lamination comprising multiple lamination units. These multiple lamination units are welded together to form a stator core. Improper welding positions and dimensions of the stator core can lead to poor torque output quality and high torque pulsation in the motor. Utility Model Content

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

[0005] Therefore, the first aspect of this application proposes a stator lamination.

[0006] The second aspect of this application proposes a stator.

[0007] The third aspect of this application proposes an electric motor.

[0008] The fourth aspect of this application proposes a braking system.

[0009] The fifth aspect of this application proposes a vehicle.

[0010] In view of the above, the first aspect of this application provides a stator lamination, comprising: a plurality of lamination units, each lamination unit including a yoke and a toothed portion, the yokes of the plurality of lamination units being sequentially connected around the axis of the stator lamination, and the teeth of the plurality of lamination units enclosing an mounting cavity; the outer peripheral wall of the yoke is provided with a positioning groove and two recesses, the positioning groove being located between the two recesses, and the recesses of any two adjacent lamination units being joined together to form a connecting groove, the positioning groove and the recesses both penetrating the two axial end faces of the yoke; the toothed portion includes a tooth body and a tooth shoe, the tooth body being connected between the tooth shoe and the yoke; on the axial end face of the yoke, the circumferential width of the positioning groove is b1, the circumferential width of the recess is b2, and the circumferential width of the tooth body is bst; on the axial end face of the yoke, along the yoke to the toothed portion, the depth of the positioning groove is h1, the depth of the recess is h2, and the thickness of the yoke is bsy; wherein, (b1+2×b2)×(h1+h2)<bst 2 +bsy 2 .

[0011] This application provides a stator lamination comprising multiple lamination units. Each lamination unit includes a yoke and a toothed portion. The toothed portion includes a tooth body and a tooth shoe, with the tooth body connecting the tooth shoe and the yoke. The yokes of the multiple lamination units are sequentially connected around the axis of the stator lamination, and the teeth of the multiple lamination units enclose a mounting cavity for accommodating the rotor of the motor, providing clearance space for the rotor to rotate relative to the stator.

[0012] The outer peripheral wall of the yoke is provided with a positioning groove and two recesses, with the positioning groove located between the two recesses. The recesses of any two adjacent lamination units are joined together to form a connecting groove, which is used to accommodate solder so that the two adjacent lamination units can be welded together, achieving the purpose of welding and assembling the stator of the motor.

[0013] The recess extends through the two axial end faces of the yoke. This design ensures the filling area of ​​the solder and guarantees the effectiveness and feasibility of welding and assembling the stator laminations.

[0014] The motor includes a stator, which includes a stator core, and the stator core includes multiple stacked stator units. When assembling stator laminations, the locating slots are used to cooperate with the locating parts of the tooling. That is, the locating slots serve as the locating reference for assembling multiple stator laminations, ensuring the mating dimensions of the multiple stator laminations.

[0015] On the axial end face of the yoke, the circumferential width of the positioning groove is b1, the circumferential width of the recess is b2, and the circumferential width of the tooth body is bst.

[0016] On the axial end face of the yoke, along the yoke to the tooth, the depth of the positioning groove is h1, the depth of the recess is h2, and the thickness of the yoke is bsy.

[0017] The placement of the positioning groove and the recess can adjust the direction of the magnetic field lines and the distribution of the magnetic field.

[0018] This application achieves the desired result by reasonably setting the relationship between b1, b2, h1, h2, bst, and bsy, such that (b1+2×b2)×(h1+h2)<bst. 2 +bsy 2 This design ensures that the size of the positioning slots and recesses matches the dimensions of the lamination units. This achieves three key benefits: first, it guarantees the stability and reliability of the welded assembly of multiple lamination units; second, it ensures the proper fit dimensions during the assembly of multiple stator laminations; and third, it ensures the orientation of the magnetic field lines, guaranteeing an effective magnetic field distribution and avoiding oversaturated or undersaturated regions in the magnetic flux density design. This ultimately improves the motor's output torque and reduces torque ripple, effectively lowering operating noise. In other words, this design balances the effectiveness of stator lamination assembly with the performance of the motor.

[0019] The stator lamination described above according to this application may also have the following additional technical features:

[0020] In some embodiments, optionally, b1, b2, h1, h2, bst, and bsy satisfy: 0 < (b1 + 2 × b2) × (h1 + h2) / (bst) 2 +bsy 2 <0.3.

[0021] In this embodiment, the matching relationship of parameters b1, b2, h1, h2, bst, and bsy is further defined.

[0022] Specifically, b1, b2, h1, h2, bst, and bsy satisfy: 0 < (b1 + 2 × b2) × (h1 + h2) / (bst) 2 +bsy 2 ) < 0.3. That is, ((b1+2×b2)×(h1+h2)) and (bst 2 +bsy 2 The ratio is within the range of greater than 0 and less than 0.3, which takes into account both the effectiveness of stator lamination assembly and motor performance.

[0023] If (b1+2×b2)×(h1+h2) / (bst) 2 +bsy 2 If the size of the positioning groove and the recess is too large, it will change the direction of the magnetic field lines, change the distribution of the magnetic field, reduce the output torque of the motor, and increase the torque pulsation of the motor.

[0024] In some embodiments, optionally, on the axial end face of the lamination unit, the center line of the positioning groove passes through the center of the mounting cavity, the circumferential end face of the yoke makes an angle of 180° / Z with the center line of the positioning groove, and the center line of the positioning groove passes through the center of the groove opening and the center of the groove bottom; where Z is the number of lamination units.

[0025] In this embodiment, the structure of the stator lamination is further defined.

[0026] On the axial end face of the lamination unit, the center line of the positioning groove is a straight line passing through the center of the groove opening and the center of the groove bottom, and the center line of the positioning groove passes through the center of the mounting cavity.

[0027] Furthermore, the angle between the circumferential end face of the yoke and the center line of the positioning groove is 180° / Z. Here, Z refers to the number of lamination units. That is, the stator laminations include Z lamination units.

[0028] This setting defines the location of the positioning groove and recess in the lamination unit, thus defining the direction of the magnetic field lines and the distribution of the magnetic field. It avoids oversaturation and undersaturation regions in the magnetic flux density design, thereby improving the output torque of the motor and reducing the torque pulsation of the motor, and effectively reducing the operating noise of the motor.

[0029] In some embodiments, optionally, on the axial end face of the lamination unit, the distance Ris from the center of the mounting cavity to the end face of the toothed shoe away from the yoke and the distance Ros from the center of the mounting cavity to the outer peripheral wall of the yoke satisfy: 0.5≤Ris / Ros≤0.6.

[0030] In this embodiment, the structure of the stator lamination is further defined.

[0031] On the axial end face of the lamination unit, the distance from the center of the mounting cavity to the end face of the toothed shoe away from the yoke is denoted as Ris.

[0032] On the axial end face of the lamination unit, the distance from the center of the mounting cavity to the outer peripheral wall of the yoke is denoted as Ros.

[0033] Ris and Ros satisfy: 0.5≤Ris / Ros≤0.6.

[0034] It is understandable that in stator laminations, the yoke and two adjacent teeth enclose a stator slot, defining the fit between the yoke and the mounting cavity. While maintaining a constant inner diameter of the stator lamination, the ring width of the yoke can affect the magnetic flux density of the yoke, the size of the stator slot, the motor's torque output, and the stator's stiffness. This application rationally sets the relationship between the distance Ris from the center of the mounting cavity to the end face of the tooth shoe away from the yoke and the distance Ros from the center of the mounting cavity to the outer peripheral wall of the yoke. While ensuring the motor's output torque and the stator lamination's stiffness, it optimizes the magnetic flux density distribution of the stator lamination's yoke, which is beneficial for improving motor efficiency; that is, it balances the motor's output torque and efficiency.

[0035] If Ris / Ros is less than 0.5, the motor's output capacity is insufficient and the motor's output torque is poor.

[0036] If Ris / Ros is greater than 0.6, the motor's moment of inertia is large, resulting in poor starting, acceleration, and braking performance, thus reducing the motor's overall performance.

[0037] In some embodiments, bst and bsy may optionally satisfy: 0.5 ≤ bsy / bst ≤ 1.

[0038] In this embodiment, the structure of the stator lamination is further defined.

[0039] On the axial end face of the yoke, the circumferential width of the tooth body is denoted as bst.

[0040] On the axial end face of the yoke, along the yoke to the tooth, the thickness of the yoke is bsy.

[0041] The ratio of bsy to bst is greater than or equal to 0.5 and less than or equal to 1, which limits the ratio between the circumferential width of the tooth body and the ring width of the yoke. The ring width of the yoke can affect the magnetic flux density of the yoke, the size of the stator slots, the torque output of the motor, and the stiffness of the stator. This application reasonably limits the relationship between bst and bsy, and optimizes the magnetic flux density distribution of the yoke of the stator laminations while ensuring the output torque of the motor and the stiffness of the stator laminations. This is beneficial to improving the efficiency of the motor, that is, it balances the output torque and efficiency of the motor.

[0042] If bsy / bst is less than 0.5, the ring width of the yoke is thinner and the stiffness of the stator lamination is smaller. This will result in an oversaturation region in the magnetic flux density design, which will reduce the output torque, increase torque ripple, and increase the vibration and noise of the motor.

[0043] If bsy / bst is greater than 1, the ring width of the yoke will be thicker, which will waste material of the stator laminations, affect the area of ​​the stator slots, and affect the slot fill factor and current density of the motor, thus affecting the performance of the motor.

[0044] In some embodiments, optionally, the number of lamination units Z (b1, b2, h1, h2, bsy, and the distance Ros from the center of the mounting cavity to the outer peripheral wall of the yoke) satisfies: Z×(h1×b1+h2×b2)<π×(Ros) 2 -(Ros-bsy) 2 ).

[0045] In this embodiment, the structure of the stator lamination is further defined.

[0046] On the axial end face of the yoke, the circumferential width of the positioning groove is denoted as b1, and the circumferential width of the recess is denoted as b2.

[0047] On the axial end face of the yoke, along the yoke to the tooth, the depth of the positioning groove is denoted as h1, the depth of the recess is denoted as h2, and the thickness of the yoke is denoted as bsy.

[0048] The number of lamination units is denoted as Z.

[0049] The distance from the center of the mounting cavity to the outer peripheral wall of the yoke is denoted as Ros.

[0050] b1, b2, h1, h2, bsy, Z, and Ros satisfy: Z×(h1×b1+h2×b2)<π×(Ros) 2 -

[0051] (Ros-bsy) 2 ).

[0052] This design further defines the matching relationship between the size of the positioning slot and the recess and the dimensions of the lamination unit. This ensures, firstly, the stability and reliability of the welded assembly of multiple lamination units; secondly, it guarantees the dimensional fit during the assembly of multiple stator laminations; and thirdly, it ensures the orientation of the magnetic field lines, guaranteeing the effective distribution of the magnetic field and avoiding oversaturated and undersaturated regions in the magnetic flux density design. This achieves the goal of increasing the motor's output torque and reducing torque ripple, effectively reducing motor operating noise. It balances the effectiveness of stator lamination assembly with motor performance.

[0053] In some embodiments, optionally, b1, b2, h1, h2, bsy, Z, and Ros satisfy: 0 < Z × (h1 × b1 + h2 × b2) / (π × (Ros) 2 -(Ros-bsy) 2 )) < 0.2.

[0054] In this embodiment, the matching relationship of parameters b1, b2, h1, h2, bsy, Z and Ros is further defined.

[0055] Specifically, b1, b2, h1, h2, bsy, Z, and Ros satisfy: 0 < Z × (h1 × b1 + h2 × b2) / (π × (Ros) 2 -(Ros-bsy) 2 )) < 0.2.

[0056] That is, (Z×(h1×b1+h2×b2)) and (π×(Ros 2 -(Ros-bsy) 2 The ratio of )) is within the range of greater than 0 and less than 0.2, which takes into account both the effectiveness of stator lamination assembly and motor performance.

[0057] If Z×(h1×b1+h2×b2) / (π×(Ros 2 -(Ros-bsy) 2 If the size of the positioning groove and the recess is too large, it will change the direction of the magnetic field lines, change the distribution of the magnetic field, reduce the output torque of the motor, and increase the torque pulsation of the motor.

[0058] In some embodiments, optionally, the angle β between the reference line and the center line of the positioning groove and the number of lamination units Z satisfy: 150° / Z≤β≤180° / Z-0.1°; on the axial end face of the lamination unit, the reference line passes through the center of the mounting cavity and the endpoint of the toothed shoe in the circumferential direction of the stator lamination, and the center line of the positioning groove passes through the center of the opening of the positioning groove and the center of the bottom of the positioning groove.

[0059] In this embodiment, the structure of the stator lamination is further defined.

[0060] Define a reference line that passes through the center of the mounting cavity and the endpoint of the toothed shoe in the circumferential direction of the stator lamination.

[0061] Define the centerline of the positioning groove, which passes through the center of the groove opening and the center of the groove bottom.

[0062] The relationship between the angle β between the reference line and the center line of the positioning groove and the number Z of the lamination units is limited to satisfy 150° / Z≤β≤180° / Z-0.1°. This setting limits the opening angle corresponding to the tooth shoe of the tooth section, which can ensure the magnetic circuit, take into account the output torque and torque pulsation of the motor, and ensure the performance and market competitiveness of the motor.

[0063] The second aspect of this application proposes a stator comprising: a plurality of stator laminations as in the first aspect, wherein the plurality of stator laminations are stacked.

[0064] The stator provided in this application includes a plurality of stator laminations as described in the first aspect. Because it includes stator laminations as described in the first aspect, it has all the beneficial effects of the aforementioned stator laminations, which will not be described in detail here.

[0065] A third aspect of this application provides an electric motor comprising: a rotor; and a stator as described in the second aspect, the rotor being rotatably disposed in a mounting cavity.

[0066] The motor provided in this application includes a rotor and a stator as described in the second aspect. Because it includes a stator as described in the second aspect, it has all the beneficial effects of the aforementioned stator, which will not be described in detail here.

[0067] The fourth aspect of this application proposes a braking system comprising: an electric motor as described in the third aspect.

[0068] The braking system provided in this application includes a motor as described in the third aspect, and therefore has all the beneficial effects of the aforementioned motor, which will not be described in detail here.

[0069] The fifth aspect of this application proposes a vehicle comprising: an electric motor as in the third aspect; or a braking system as in the fourth aspect.

[0070] The vehicle provided in this application, having included an electric motor as described in the third aspect or a braking system as described in the fourth aspect, thus possesses all the beneficial effects of the aforementioned electric motor or braking system, which will not be described in detail here.

[0071] It is worth noting 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, and hydrogen engine vehicles.

[0072] The vehicle can also be a gasoline-powered car.

[0073] Additional aspects and advantages of this application will become apparent in the following description or may be learned by practice of this application. Attached Figure Description

[0074] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0075] Figure 1 A schematic diagram of the lamination unit of the first embodiment of this application is shown;

[0076] Figure 2 A schematic diagram of the dimensions of the lamination unit according to the first embodiment of this application is shown;

[0077] Figure 3 A schematic diagram of the lamination unit according to the second embodiment of this application is shown;

[0078] Figure 4 A schematic diagram of the stator lamination structure according to the first embodiment of this application is shown;

[0079] Figure 5 A schematic diagram of the stator lamination structure according to the second embodiment of this application is shown;

[0080] Figure 6 The diagram shows a curve illustrating how the ratio of the average torque to the torque ripple of the motor in this application varies with X.

[0081] in, Figures 1 to 5 The correspondence between the reference numerals and component names in the attached drawings is as follows:

[0082] 10 Stator lamination, 100 Lamination unit, 110 Yoke, 111 Circumferential end face of yoke, 112 Positioning groove, 1122 Groove opening of positioning groove, 1124 Groove bottom of positioning groove, 113 Recess, 114 Connecting groove, 115 Axial end face of yoke, 117 Outer peripheral wall of yoke, 120 Tooth, 122 Tooth body, 124 Tooth shoe, 130 Mounting cavity, 140 Axial end face of lamination unit, 150 Center line of positioning groove, 160 Reference line. Detailed Implementation

[0083] To better understand the above-mentioned objectives, features, and advantages of this application, the application will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0084] Many specific details are set forth in the following description in order to provide a full understanding of this application. However, this application may also be implemented in other ways different from those described herein. Therefore, the scope of protection of this application is not limited to the specific embodiments disclosed below.

[0085] The following reference Figures 1 to 6 This application describes stator lamination 10, stator, motor, braking system, and vehicle according to some embodiments.

[0086] like Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown, a stator lamination 10 according to some embodiments of this application includes a plurality of lamination units 100.

[0087] The lamination unit 100 includes a yoke 110 and a toothed portion 120.

[0088] The yokes 110 of multiple lamination units 100 are connected in sequence around the axis of the stator lamination 10.

[0089] The teeth 120 of multiple lamination units 100 enclose the mounting cavity 130.

[0090] The outer peripheral wall 117 of the yoke is provided with a positioning groove 112 and two recesses 113.

[0091] The positioning groove 112 is located between the two recesses 113.

[0092] The recesses 113 of any two adjacent lamination units 100 are joined together to form a connecting groove 114.

[0093] The positioning groove 112 and the recess 113 both penetrate the two axial end faces of the yoke 110; the tooth 120 includes a tooth body 122 and a tooth shoe 124, with the tooth body 122 connecting the tooth shoe 124 and the yoke 110.

[0094] On the axial end face 115 of the yoke, the circumferential width of the positioning groove 112 is b1, the circumferential width of the recess 113 is b2, and the circumferential width of the tooth body 122 is bst.

[0095] On the axial end face 115 of the yoke, along the yoke 110 to the tooth 120, the depth of the positioning groove 112 is h1, the depth of the recess 113 is h2, and the thickness of the yoke 110 is bsy.

[0096] Where (b1+2×b2)×(h1+h2)<bst 2 +bsy 2 .

[0097] This application provides a stator lamination 10 comprising a plurality of lamination units 100. Each of the plurality of lamination units 100 includes a yoke 110 and a toothed portion 120. The toothed portion 120 includes a tooth body 122 and a toothed shoe 124, with the tooth body 122 connected between the toothed shoe 124 and the yoke 110. The yokes 110 of the plurality of lamination units 100 are sequentially connected around the axis of the stator lamination 10, and the teeth 120 of the plurality of lamination units 100 enclose a mounting cavity 130 for accommodating the rotor of the motor and providing clearance space for the rotor to rotate relative to the stator.

[0098] The outer peripheral wall 117 of the yoke is provided with a positioning groove 112 and two recesses 113, with the positioning groove 112 located between the two recesses 113. The recesses 113 of any two adjacent lamination units 100 are joined together to form a connecting groove 114. The connecting groove 114 is used to accommodate solder so that the two adjacent lamination units 100 are welded together, thereby achieving the purpose of welding and assembling the stator of the motor.

[0099] The recess 113 penetrates the two axial end faces of the yoke 110. This design can ensure the filling area of ​​the solder and ensure the effectiveness and feasibility of welding the stator laminations 10 into a circle.

[0100] The motor includes a stator, which includes a stator core, and the stator core includes multiple stacked stator units. When assembling the stator laminations 10, the positioning groove 112 is used to cooperate with the positioning parts of the tooling. That is, the positioning groove 112 serves as the positioning reference for assembling multiple stator laminations 10, which can ensure the mating dimensions of the multiple stator laminations 10.

[0101] On the axial end face 115 of the yoke, the circumferential width of the positioning groove 112 is b1, the circumferential width of the recess 113 is b2, and the circumferential width of the tooth body 122 is bst.

[0102] On the axial end face 115 of the yoke, along the yoke 110 to the tooth 120, the depth of the positioning groove 112 is h1, the depth of the recess 113 is h2, and the thickness of the yoke 110 is bsy.

[0103] The positioning groove 112 and the recess 113 can adjust the direction of the magnetic field lines and the distribution of the magnetic field.

[0104] This application achieves the desired result by reasonably setting the relationship between b1, b2, h1, h2, bst, and bsy, such that (b1+2×b2)×(h1+h2)<bst. 2 +bsy 2This design ensures that the sizes of the positioning groove 112 and the recess 113 match the dimensions of the lamination unit 100. This achieves three main benefits: first, it guarantees the stability and reliability of the welded assembly of multiple lamination units 100; second, it ensures the dimensional fit of the multiple stator laminations 10 during assembly; and third, it ensures the orientation of the magnetic field lines, guaranteeing an effective magnetic field distribution and avoiding oversaturated or undersaturated regions in the magnetic flux density design. This results in increased motor output torque and reduced torque ripple, effectively lowering motor operating noise. In other words, this design balances the effectiveness of stator lamination assembly with motor performance.

[0105] In some embodiments, optionally, b1, b2, h1, h2, bst, and bsy satisfy: 0 < (b1 + 2 × b2) × (h1 + h2) / (bst) 2 +bsy 2 <0.3.

[0106] In this embodiment, the matching relationship of parameters b1, b2, h1, h2, bst, and bsy is further defined.

[0107] Specifically, b1, b2, h1, h2, bst, and bsy satisfy: 0 < (b1 + 2 × b2) × (h1 + h2) / (bst) 2 +bsy 2 ) < 0.3. That is, ((b1+2×b2)×(h1+h2)) and (bst 2 +bsy 2 The ratio is within the range of greater than 0 and less than 0.3, which takes into account both the effectiveness of the stator lamination 10 assembly and the performance of the motor.

[0108] If (b1+2×b2)×(h1+h2) / (bst) 2 +bsy 2 If the dimensions of the positioning groove 112 and the recess 113 are too large, it will change the direction of the magnetic field lines, change the distribution of the magnetic field, reduce the output torque of the motor, and increase the torque pulsation of the motor.

[0109] Alternatively, (b1+2×b2)×(h1+h2) / (bst) 2 +bsy 2 )=0.1, (b1+2×b2)×(h1+h2) / (bst 2 +bsy 2 )=0.15, (b1+2×b2)×(h1+h2) / (bst 2 +bsy 2 )=0.18, (b1+2×b2)×(h1+h2) / (bst 2 +bsy2 )=0.2, (b1+2×b2)×(h1+h2) / (bst 2 +bsy 2 ) = 0.22 and (b1 + 2 × b2) × (h1 + h2) / (bst) 2 +bsy 2 ) = 0.28, etc., which will not be listed here.

[0110] In some embodiments, optionally, such as Figure 2 As shown, on the axial end face 140 of the lamination unit, the center line 150 of the positioning groove passes through the center of the mounting cavity 130.

[0111] On the axial end face 140 of the lamination unit, the angle between the circumferential end face 111 of the yoke and the center line 150 of the positioning groove is 180° / Z.

[0112] On the axial end face 140 of the lamination unit, the center line 150 of the positioning groove passes through the center of the groove opening 1122 and the center of the groove bottom 1124.

[0113] Where Z represents the number of lamination units 100.

[0114] In this embodiment, the structure of the stator lamination 10 is further defined.

[0115] On the axial end face 140 of the lamination unit, the center line 150 of the positioning groove is a straight line passing through the center of the groove opening 1122 and the center of the groove bottom 1124 of the positioning groove, and the center line 150 of the positioning groove passes through the center of the mounting cavity 130.

[0116] Furthermore, the angle between the circumferential end face 111 of the yoke and the center line 150 of the positioning groove is 180° / Z. Here, Z refers to the number of lamination units 100. That is, the stator lamination 10 includes Z lamination units 100.

[0117] This setting defines the location of the positioning groove 112 and the recess 113 in the lamination unit 100. This limits the direction of the magnetic field lines and the distribution of the magnetic field, avoiding oversaturation and undersaturation regions in the magnetic flux density design. This achieves the purpose of increasing the output torque of the motor and reducing the torque pulsation of the motor, and can effectively reduce the operating noise of the motor.

[0118] In some embodiments, optionally, such as Figure 2 As shown, on the axial end face 140 of the lamination unit, the distance Ris from the center of the mounting cavity 130 to the end face of the toothed shoe 124 away from the yoke 110 and the distance Ros from the center of the mounting cavity 130 to the outer peripheral wall 117 of the yoke satisfy: 0.5≤Ris / Ros≤0.6.

[0119] In this embodiment, the structure of the stator lamination 10 is further defined.

[0120] On the axial end face 140 of the lamination unit, the distance from the center of the mounting cavity 130 to the end face of the toothed shoe 124 away from the yoke 110 is denoted as Ris.

[0121] On the axial end face 140 of the lamination unit, the distance from the center of the mounting cavity 130 to the outer peripheral wall 117 of the yoke is denoted as Ros.

[0122] Ris and Ros satisfy: 0.5≤Ris / Ros≤0.6.

[0123] It is understandable that in the stator lamination 10, the yoke 110 and two adjacent tooth portions 120 enclose a stator slot, defining the mating structure between the yoke 110 and the mounting cavity 130. While ensuring the inner diameter of the stator lamination 10 remains constant, the annular width of the yoke 110 can affect the magnetic flux density of the yoke 110, the size of the stator slot, the motor torque output, and the stator stiffness. This application rationally sets the relationship between the distance Ris from the center of the mounting cavity 130 to the end face Ris of the tooth shoe 124 away from the yoke 110 and the distance Ros from the center of the mounting cavity 130 to the outer peripheral wall 117 of the yoke. While ensuring the motor output torque and the stiffness of the stator lamination 10, the magnetic flux density distribution of the yoke 110 of the stator lamination 10 is optimized, which is beneficial to improving the motor efficiency; that is, it balances the motor output torque and efficiency.

[0124] If Ris / Ros is less than 0.5, the motor's output capacity is insufficient and the motor's output torque is poor.

[0125] If Ris / Ros is greater than 0.6, the motor's moment of inertia is large, resulting in poor starting, acceleration, and braking performance, thus reducing the motor's overall performance.

[0126] Alternatively, Ris / Ros = 0.52, Ris / Ros = 0.54, Ris / Ros = 0.55, Ris / Ros = 0.56 and Ris / Ros = 0.58, etc., which will not be listed here.

[0127] In some embodiments, optionally, such as Figure 2 As shown, bst and bsy satisfy: 0.5 ≤ bsy / bst ≤ 1.

[0128] In this embodiment, the structure of the stator lamination 10 is further defined.

[0129] On the axial end face 115 of the yoke, the circumferential width of the tooth body 122 is denoted as bst.

[0130] On the axial end face 115 of the yoke, along the yoke 110 to the tooth 120, the thickness of the yoke 110 is bsy.

[0131] The ratio of bsy to bst is greater than or equal to 0.5 and less than or equal to 1, which limits the ratio between the ring width of the yoke 110 and the circumferential width of the tooth body 122. The ring width of the yoke 110 can affect the magnetic flux density of the yoke 110, the size of the stator slots, the torque output of the motor, and the stiffness of the stator. This application reasonably limits the relationship between bsy and bst, and optimizes the magnetic flux density distribution of the yoke 110 of the stator lamination 10 while ensuring the output torque of the motor and the stiffness of the stator lamination 10. This is beneficial to improving the efficiency of the motor, that is, it balances the output torque and efficiency of the motor.

[0132] If bsy / bst is less than 0.5, the ring width of the yoke 110 will be thicker, which will waste the material of the stator lamination 10, affect the area of ​​the stator slot, and affect the slot fill factor and current density of the motor, thus affecting the performance of the motor.

[0133] If bsy / bst is greater than 1, the ring width of the yoke 110 is thinner and the stiffness of the stator lamination 10 is smaller. This will result in an oversaturation region in the magnetic flux density design, which will reduce the output torque, increase torque ripple, and increase the vibration and noise of the motor.

[0134] Alternatively, bsy / bst = 0.6, bsy / bst = 0.7, bsy / bst = 0.8, and bsy / bst = 0.9, etc., which will not be listed here.

[0135] In some embodiments, optionally, such as Figure 2 As shown, the number Z of b1, b2, h1, h2, bsy, and lamination unit 100, and the distance Ros from the center of the mounting cavity 130 to the outer peripheral wall 117 of the yoke, satisfy: Z×(h1×b1+h2×b2)<π×(Ros) 2 -(Ros-bsy) 2 ).

[0136] In this embodiment, the structure of the stator lamination 10 is further defined.

[0137] On the axial end face 115 of the yoke, the circumferential width of the positioning groove 112 is denoted as b1, and the circumferential width of the recess 113 is denoted as b2.

[0138] On the axial end face 115 of the yoke, along the yoke 110 to the tooth 120, the depth of the positioning groove 112 is denoted as h1, the depth of the recess 113 is denoted as h2, and the thickness of the yoke 110 is denoted as bsy.

[0139] The number of stamping units 100 is denoted as Z.

[0140] The distance from the center of the mounting cavity 130 to the outer peripheral wall 117 of the yoke is denoted as Ros.

[0141] b1, b2, h1, h2, bsy, Z, and Ros satisfy: Z×(h1×b1+h2×b2)<π×(Ros) 2 -

[0142] (Ros-bsy) 2 ).

[0143] This design further defines the size matching relationship between the positioning groove 112 and the recess 113 and the dimensions of the lamination unit 100. This ensures, firstly, the stability and reliability of the welded assembly of multiple lamination units 100; secondly, it guarantees the dimensional fit during assembly of multiple stator laminations 10; and thirdly, it ensures the orientation of the magnetic field lines, guaranteeing the effective distribution of the magnetic field and avoiding oversaturated and undersaturated regions in the magnetic flux density design. This achieves the goal of increasing the motor's output torque and reducing torque ripple, effectively reducing motor operating noise. In other words, this design balances the effectiveness of stator lamination assembly with motor performance.

[0144] In some embodiments, optionally, b1, b2, h1, h2, bsy, Z, and Ros satisfy: 0 < Z × (h1 × b1 + h2 × b2) / (π × (Ros) 2 -(Ros-bsy) 2 )) < 0.2.

[0145] In this embodiment, the matching relationship of parameters b1, b2, h1, h2, bsy, Z and Ros is further defined.

[0146] Specifically, b1, b2, h1, h2, bsy, Z, and Ros satisfy: 0 < Z × (h1 × b1 + h2 × b2) / (π × (Ros) 2 -(Ros-bsy) 2 )) < 0.2.

[0147] That is, (Z×(h1×b1+h2×b2)) and (π×(Ros 2 -(Ros-bsy) 2 The ratio of )) is within the range of greater than 0 and less than 0.2, which takes into account both the effectiveness of the stator lamination 10 assembly and the performance of the motor.

[0148] If Z×(h1×b1+h2×b2) / (π×(Ros 2 -(Ros-bsy) 2If the dimensions of the positioning groove 112 and the recess 113 are too large, it will change the direction of the magnetic field lines, change the distribution of the magnetic field, reduce the output torque of the motor, and increase the torque pulsation of the motor.

[0149] Alternatively, Z×(h1×b1+h2×b2) / (π×(Ros 2 -(Ros-bsy) 2 ))=0.05, Z×(h1×b1+h2×b2) / (π×(Ros 2 -(Ros-bsy) 2 ))=0.08, Z×(h1×b1+h2×b2) / (π×(Ros 2 -(Ros-bsy) 2 ))=0.1, Z×(h1×b1+h2×b2) / (π×(Ros 2 -(Ros-bsy) 2 ))=0.12, Z×(h1×b1+h2×b2) / (π×(Ros 2 -(Ros-bsy) 2 ))=0.15 and Z×(h1×b1+h2×b2) / (π×(Ros 2 -(Ros-bsy) 2 )) = 0.18, etc., which will not be listed here one by one.

[0150] In some embodiments, optionally, such as Figure 2 As shown, the angle β between the reference line 160 and the center line 150 of the positioning groove and the number Z of the lamination unit 100 satisfy: 150° / Z≤β≤180° / Z-0.1°.

[0151] On the axial end face 140 of the lamination unit, the reference line 160 passes through the center of the mounting cavity 130 and the endpoint of the toothed shoe 124 in the circumferential direction of the stator lamination 10.

[0152] On the axial end face 140 of the lamination unit, the center line 150 of the positioning groove passes through the center of the groove opening 1122 and the center of the groove bottom 1124.

[0153] In this embodiment, the structure of the stator lamination 10 is further defined.

[0154] Define reference line 160, which passes through the center of mounting cavity 130 and the endpoint of toothed shoe 124 in the circumferential direction of stator lamination 10.

[0155] Define the center line 150 of the positioning groove, which passes through the center of the groove opening 1122 and the center of the groove bottom 1124.

[0156] The relationship between the angle β between the reference line 160 and the center line 150 of the positioning groove and the number Z of the lamination units 100 is defined to satisfy 150° / Z≤β≤180° / Z-0.1°. This setting defines the opening angle corresponding to the tooth shoe 124 of the tooth section 120, which can ensure the magnetic circuit, take into account the output torque and torque pulsation of the motor, and ensure the performance and market competitiveness of the motor.

[0157] Alternatively, β = 155° / Z, β = 160° / Z, β = 162° / Z, β = 165° / Z, and β = 170° / Z, etc., will not be listed here.

[0158] A stator according to some embodiments of this application includes: a plurality of stator laminations 10 as described in any of the above embodiments, wherein the plurality of stator laminations 10 are stacked.

[0159] The stator provided in this application includes a plurality of stator laminations 10 according to any of the above embodiments. Since it includes stator laminations 10 as described in any of the above embodiments, it has all the beneficial effects of the stator laminations 10 described above, which will not be described one by one here.

[0160] An electric motor according to some embodiments of the present application includes: a rotor; and a stator as described in the above embodiments, the rotor being rotatably disposed in a mounting cavity 130.

[0161] The motor provided in this application includes a rotor and a stator as described in the above embodiments. Since it includes the stator as described in the above embodiments, it has all the beneficial effects of the stator described above, which will not be described one by one here.

[0162] A braking system according to some embodiments of this application includes: a motor as described in the above embodiments.

[0163] The braking system provided in this application includes a motor as described in the above embodiments, and therefore has all the beneficial effects of the motor described above, which will not be described in detail here.

[0164] Optionally, the motor is a brake motor.

[0165] A vehicle according to some embodiments of the present application includes: a motor as described in the above embodiments; or a braking system as described in the above embodiments.

[0166] The vehicle provided in this application includes a motor as described in the above embodiments or a braking system as described in the above embodiments, and therefore has all the beneficial effects of the motor or braking system described above, which will not be described one by one here.

[0167] It is worth noting 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, and hydrogen engine vehicles.

[0168] The vehicle can also be a gasoline-powered car.

[0169] Optionally, the stator includes a stator core, which includes a plurality of stator laminations 10, which are stacked. Each stator lamination 10 includes a plurality of lamination units 100. The plurality of lamination units 100 are spliced ​​together along the circumference of the stator.

[0170] The stator core includes multiple stator laminations 10, which are stacked together.

[0171] The stator lamination 10 has a positioning groove 112 and a connecting groove 114 on its outer peripheral wall. The positioning groove 112 is used for positioning. The connecting groove 114 is used for welding. The stator lamination 10 includes multiple lamination units 100, and the yokes 110 of the multiple lamination units 100 are connected sequentially around the axis of the stator lamination 10. On the axial end face 115 of the yoke, the circumferential width of the positioning groove 112 is b1, the circumferential width of the recess 113 is b2, and the circumferential width of the tooth body 122 is bst. On the axial end face 115 of the yoke, along the yoke 110 to the tooth body 120, the depth of the positioning groove 112 is h1, the depth of the recess 113 is h2, and the thickness of the yoke 110 is bsy.

[0172] b1, b2, h1, h2, bst, and bsy satisfy: 0 < (b1 + 2 × b2) × (h1 + h2) / (bst) 2 +bsy 2 )

[0173] <0.3.

[0174] Multiple lamination units 100 have teeth 120 that enclose a mounting cavity 130. The mounting cavity 130 is used to house the rotor. There is a gap between the cavity wall of the mounting cavity 130 and the outer peripheral wall of the rotor. This application optimizes the dimensional relationship between the positioning groove 112, the connecting groove 114, and the lamination units 100, effectively solving the stator rounding positioning and welding problems of the motor while ensuring motor performance.

[0175] Optionally, on the axial end face 140 of the lamination unit, the center line 150 of the positioning groove passes through the center of the mounting cavity 130. The angle between the circumferential end face 111 of the yoke and the center line 150 of the positioning groove is 180° / Z, where Z is the number of lamination units 100.

[0176] Optionally, the radius of the inner edge of the stator lamination 10 is Ris, and the radius of the outer edge of the stator lamination 10 is Ros. That is, on the axial end face 140 of the lamination unit, the distance from the center of the mounting cavity 130 to the end face of the toothed shoe 124 away from the yoke 110 is denoted as Ris, and the distance from the center of the mounting cavity 130 to the outer peripheral wall 117 of the yoke is denoted as Ros. Ris and Ros satisfy 0.5≤Ris / Ros≤0.6.

[0177] Optionally, b1, b2, h1, h2, bsy, the number Z of the punching unit 100, and the distance Ros from the center of the installation cavity 130 to the outer peripheral wall 117 of the yoke satisfy: 0 < Z×(h1×b1 + h2×b2) / (π×(Ros 2 -(Ros - bsy) 2 )) < 0.2.

[0178] Optionally, the included angle β between the reference line 160 and the center line 150 of the positioning groove and the number Z of the punching unit 100 satisfy: 150° / Z ≤ β ≤ 180° / Z - 0.1°; on the axial end face 140 of the punching unit, the reference line 160 passes through the center of the installation cavity 130 and the circumferential end point of the tooth boot 124 on the stator punching 10, and the center line 150 of the positioning groove passes through the center of the notch 1122 of the positioning groove and the center of the bottom 1124 of the positioning groove.

[0179] Optionally, the number of Z is 12.

[0180] Optionally, let (b1 + 2×b2)×(h1 + h2) / (bst 2 +bsy 2 ) = X. Take X = 0 as the comparison reference. As Figure 6 shown, Tave* and Tripple* are per-unit values. Tave* is the ratio of the average torque at different X to the average torque at X = 0, and Tripple* is the ratio of the torque ripple at different X to the torque ripple at X = 0. When 0 < X < 0.3, Tave* is greater than 0.85 and Tripple* is smaller. When X ≥ 0.3, as X increases, Tave* shows a downward trend and Tripple* also shows an upward trend. Therefore, when 0 < X < 0.3, the electromagnetic performance of the motor is better.

[0181] In this application, the term "plurality" means two or more, unless otherwise clearly defined. Terms such as "installation", "connection", "connection", "fixation", etc., should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; "connection" 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.

[0182] In the description of this specification, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. The above descriptions are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A stator lamination, characterized in that, include: Multiple lamination units, each lamination unit including a yoke and teeth, the yokes of the multiple lamination units being connected sequentially around the axis of the stator lamination, and the teeth of the multiple lamination units enclosing an mounting cavity; The outer peripheral wall of the yoke is provided with a positioning groove and two recesses. The positioning groove is located between the two recesses. The recesses of any two adjacent lamination units are combined to form a connecting groove. The positioning groove and the recesses both penetrate the two axial end faces of the yoke. The toothed portion includes a tooth body and a toothed shoe, wherein the tooth body is connected between the toothed shoe and the yoke; On the axial end face of the yoke, the circumferential width of the positioning groove is b1, the circumferential width of the recess is b2, and the circumferential width of the tooth body is bst. On the axial end face of the yoke, along the yoke to the tooth, the depth of the positioning groove is h1, the depth of the recess is h2, and the thickness of the yoke is bsy; Where (b1+2×b2)×(h1+h2)<bst 2 +bsy 2 .

2. The stator lamination according to claim 1, characterized in that, b1, b2, h1, h2, bst, and bsy satisfy: 0 < (b1 + 2 × b2) × (h1 + h2) / (bst) 2 +bsy 2 <0.

3.

3. The stator lamination according to claim 1 or 2, characterized in that, On the axial end face of the lamination unit, the center line of the positioning groove passes through the center of the mounting cavity, the circumferential end face of the yoke makes an angle of 180° / Z with the center line of the positioning groove, and the center line of the positioning groove passes through the center of the groove opening and the center of the groove bottom. Where Z represents the number of lamination units.

4. The stator lamination according to claim 1 or 2, characterized in that, On the axial end face of the lamination unit, the distance Ris from the center of the mounting cavity to the end face of the toothed shoe away from the yoke and the distance Ros from the center of the mounting cavity to the outer peripheral wall of the yoke satisfy: 0.5≤Ris / Ros≤0.

6.

5. The stator lamination according to claim 1 or 2, characterized in that, bst and bsy satisfy: 0.5 ≤ bsy / bst ≤ 1.

6. The stator lamination according to claim 1 or 2, characterized in that, b1, b2, h1, h2, bsy, the number Z of the lamination units, and the distance Ros from the center of the mounting cavity to the outer peripheral wall of the yoke satisfy: Z×(h1×b1+h2×b2)<π×(Ros) 2 -(Ros-bsy) 2 ).

7. The stator lamination according to claim 6, characterized in that, b1, b2, h1, h2, bsy, Z, and Ros satisfy: 0 < Z × (h1 × b1 + h2 × b2) / (π × (Ros) 2 -(Ros-bsy) 2 )) < 0.

2.

8. The stator lamination according to claim 1 or 2, characterized in that, The angle β between the reference line and the center line of the positioning groove and the number Z of the lamination units satisfy: 150° / Z≤β≤180° / Z-0.1°; On the axial end face of the lamination unit, the reference line passes through the center of the mounting cavity and the endpoint of the toothed shoe in the circumferential direction of the stator lamination, and the center line of the positioning groove passes through the center of the opening of the positioning groove and the center of the bottom of the positioning groove.

9. A stator, characterized in that, include: A plurality of stator laminations as described in any one of claims 1 to 8, wherein the plurality of stator laminations are stacked.

10. An electric motor, characterized in that, include: Rotor; and The stator as claimed in claim 9, wherein the rotor is rotatably disposed in the mounting cavity.

11. A braking system, characterized in that, include: The motor as described in claim 10.

12. A vehicle, characterized in that, include: The motor as described in claim 10; or The braking system as described in claim 11.

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