Motor stators, motors and new energy vehicles

Abstract

This application provides a motor stator, a motor, and a new energy vehicle. The motor stator includes a stator core, which includes a yoke and teeth. Adjacent teeth form a tooth groove, and a flat wire conductor is disposed in the tooth groove and wound around the teeth. In a cross-section perpendicular to the central axis of the stator core, the tooth groove includes a first side located at the bottom of the groove, a second side and a third side located on both sides of the first side, a fourth side located on the side of the second side away from the first side, and a fifth side located on the side of the third side away from the first side. An included angle Sa is formed between the fourth and fifth sides. The sum of the widths of the yoke and the teeth of the stator core is b, the radial length of the tooth groove is Sh, and the circumferential width of the tooth groove is Sb. According to the motor stator, motor, and new energy vehicle of this application, the motor temperature rise is reduced, losses are reduced, and motor efficiency is improved.

Description

Technical Field

[0001] The present application relates to the technical field of new energy vehicles, and in particular to a motor stator, a motor and a new energy vehicle. Background Art

[0002] As people pay more and more attention to environmental protection and efficient use of energy, the new four modernizations of automobiles have become an industry consensus, and the wave of automobile electrification is becoming more and more surging. As a key link in the energy conversion of new energy vehicles, drive motors have a great impact on new energy vehicles. Permanent magnet synchronous motors are widely used in the field of pure electric or hybrid new energy vehicles because of their advantages such as high torque density, high efficiency, good stability and high reliability.

[0003] In order to improve the power density of the motor, enhance the heat dissipation capacity of the motor and the stability of the structure, the motors used in new energy vehicles often use flat wire windings, which greatly improves the slot fill rate of the stator and improves the power density of the motor. In the same volume, the flat wire winding conductor has a larger cross-section and a smaller resistance, which can effectively reduce copper loss and improve motor efficiency.

[0004] However, in order to increase the conductor cross-section of the flat wire winding, the existing flat wire motor needs to increase the area of ​​the stator slot, which leads to excessive magnetic density and loss in the stator teeth and yoke, thus affecting the motor efficiency. Summary of the invention

[0005] Therefore, the technical problem to be solved by the present application is to provide a motor stator, a motor and a new energy vehicle, which can increase the cross-sectional area of ​​the flat wire conductor and reduce the resistance of the flat wire conductor, thereby reducing the temperature rise of the motor, reducing losses and improving the efficiency of the motor.

[0006] In order to solve the above problems, the present application provides a motor stator, including a stator core, the stator core including a yoke and a tooth portion, tooth slots are formed between adjacent tooth portions, a flat wire conductor is arranged in the tooth slot, and the flat wire conductor is wound on the tooth portion. In a cross section perpendicular to the central axis of the stator core, the tooth slot includes a first side located at the bottom of the slot, a second side and a third side located on both sides of the first side, a fourth side located on a side of the second side away from the first side, and a fifth side located on a side of the third side away from the first side, an angle Sa is formed between the fourth side and the fifth side, the sum of the widths of the yoke and the tooth portion is b, the radial length of the tooth slot is Sh, and the circumferential slot width of the tooth slot is Sb, wherein

[0007] Preferably,

[0008] Preferably, the outer radius of the stator core is Sr1, and the inner radius is Sr2, wherein Sr2 / Sr1=0.680-0.685.

[0009] Preferably, Sr2 / Sr1=0.6826.

[0010] Preferably, Sa=138°~138.5°.

[0011] Preferably, Sa=138.3°.

[0012] Preferably, in a cross section perpendicular to the central axis of the stator core, the outer radius of the stator core is Sr1, wherein Sb / Sr1=0.035-0.038.

[0013] Preferably, Sb / Sr1=0.036.

[0014] Preferably, in a cross section perpendicular to the central axis of the stator core, the circumferential width of the flat wire conductor is Cb, the radial width of the flat wire conductor is Ch, Sh / (Ch*8)=1.16-1.19, and / or Sb / Cb=1.24-1.26.

[0015] Preferably, Sh / (Ch*8)=1.18, and / or Sb / Cb=1.26.

[0016] Preferably, the stator core has 48 tooth slots distributed along the circumferential direction, and in each tooth slot, 8 flat wire conductors are arranged along the radial direction of the stator core.

[0017] According to another aspect of the present application, a motor is provided, including a motor stator, which is the motor stator described above.

[0018] Preferably, the outer radius of the stator of the motor is 230 mm, the peak power is 70Kw to 80Kw, and the peak speed is 9000rpm-12000rpm.

[0019] According to another aspect of the present application, a new energy vehicle is provided, comprising the above-mentioned motor stator or the above-mentioned motor.

[0020] The motor stator provided in the present application comprises a stator core, the stator core comprises a yoke and a tooth portion, tooth slots are formed between adjacent tooth portions, a flat wire is arranged in the tooth slot, the flat wire is wound around the tooth portion, in a cross section perpendicular to the central axis of the stator core, the tooth slot comprises a first side located at the bottom of the slot, a second side and a third side located at both sides of the first side, a fourth side located at a side of the second side away from the first side, and a fifth side located at a side of the third side away from the first side, an angle Sa is formed between the fourth side and the fifth side, the sum of the widths of the yoke and the tooth portion is b, the radial length of the tooth slot is Sh, and the circumferential slot width of the tooth slot is Sb, wherein By optimizing the tooth slot design, the motor stator can increase the cross-sectional area of ​​the flat wire conductor without increasing the area of ​​the tooth slot, reduce the resistance of the flat wire conductor, thereby reducing the temperature rise of the motor, reducing losses, and improving the motor efficiency. At the same time, it prevents the magnetic density of the stator core yoke from being too high, thereby ensuring the output torque of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic structural diagram of a stator core according to an embodiment of the present application;

[0022] Figure 2 This is a schematic diagram of a partially enlarged structure of a stator core according to an embodiment of the present application;

[0023] Figure 3 This is a dimension structure diagram of a stator core of an embodiment of the present application;

[0024] Figure 4 This is a partially enlarged structural diagram of a stator core according to an embodiment of the present application;

[0025] Figure 5 This is a simulation diagram of the output torque of a motor according to an embodiment of the present application;

[0026] Figure 6 This is a simulation diagram of the stator tooth magnetic flux density of a motor according to an embodiment of the present application.

[0027] The reference numerals are:

[0028] 1. stator core; 2. tooth slots; 3. flat wire conductor; 21. first side; 22. second side; 23. third side; 24. fourth side; 25. fifth side. DETAILED DESCRIPTION

[0029] See also Figures 1 to 6 As shown, according to an embodiment of the present application, the motor stator includes a stator core 1, the stator core 1 includes a yoke and a tooth portion, tooth slots 2 are formed between adjacent tooth portions, a flat wire conductor 3 is arranged in the tooth slot 2, and the flat wire conductor 3 is wound on the tooth portion, in a cross section perpendicular to the central axis of the stator core 1, the tooth slot 2 includes a first side 21 located at the bottom of the slot, a second side 22 and a third side 23 located on both sides of the first side 21, a fourth side 24 located on the side of the second side 22 away from the first side 21, and a fifth side 25 located on the side of the third side 23 away from the first side 21, an angle Sa is formed between the fourth side 24 and the fifth side 25, the sum of the widths of the yoke and the tooth portion of the stator core 1 is b, the radial length of the tooth slot 2 is Sh, and the circumferential slot width of the tooth slot 2 is Sb, wherein

[0030] By optimizing the design of the tooth slots 2, the motor stator can improve the slot fill rate without increasing the area of ​​the tooth slots 2, thereby increasing the cross-sectional area of ​​the flat wire conductor 3 in the same tooth slot 2 and reducing the resistance of the flat wire conductor 3, so that the flat wire conductor 3 can generate a stronger magnetic field strength and improve the power density of the motor. The larger contact area between the flat wire conductors 3 can also improve the thermal conductivity of the flat wire conductor 3, reduce the temperature rise of the motor, reduce losses, and improve the efficiency of the motor. At the same time, it prevents the magnetic density of the stator core yoke from being too high, thereby ensuring the output torque of the motor.

[0031] Preferably,

[0032] This ratio can further increase the width of the flat wire conductor 3 in the tooth slot 2 along the radial direction of the stator core, thereby effectively increasing the cross-sectional area of ​​the flat wire conductor 3, reducing the resistance of the flat wire conductor 3, reducing the temperature rise of the motor, reducing losses, and improving the efficiency of the motor. At the same time, this ratio can more effectively ensure that the magnetic density of the stator yoke is not over-saturated, thereby ensuring the output torque of the motor.

[0033] The above-mentioned flat wire conductor is, for example, a flat copper wire conductor.

[0034] In one embodiment, the inner tooth edge of the tooth groove 2 is grooved, the first side 21 is perpendicular to the radial line passing through the center of the first side 21, the second side 22 and the third side 23 are parallel to each other, so that the width of the tooth groove 2 is consistent, one end of the first side 21 is connected to the second side 22 by a circular arc transition, and the other end of the first side 21 is connected to the third side 23 by a circular arc transition. The width of the tooth groove 2 is the length of the line connecting the intersection of the second side 22 of the tooth groove 2 and the fourth side of the tooth groove 2 and the intersection of the third side 23 of the tooth groove 2 and the fifth side 25 of the tooth groove 2.

[0035] In this embodiment, the side of the tooth slot 2 close to the inner circle of the stator is open, so that the tooth slot 2 forms an open slot, wherein the fourth side 24 is connected to one side of the opening, the fifth side 25 is connected to the other side of the opening, and the angle formed by the intersection of the extension line of the fourth side 24 and the extension line of the fifth side 25 is Sa.

[0036] In one embodiment, the outer radius of the stator core 1 is Sr1, and the inner radius is Sr2, wherein Sr2 / Sr1=0.680-0.685.

[0037] Preferably, Sr2 / Sr1=0.6826.

[0038] The ratio of the inner and outer radius of the stator core 1 has a great influence on the output torque of the motor. The design of the ratio of the inner and outer radius has a direct influence on the design of the tooth slot 2 and the flat wire conductor 3 located in the tooth slot 2. If the ratio of the inner and outer radius of the stator core 1 is improperly designed, the output torque of the motor will be affected and the torque pulsation will be increased. By setting the ratio of the inner and outer radius of the stator core 1 to the above range of the present application, the output torque of the motor can be increased, the torque pulsation can be reduced, and the overall performance of the motor can be improved.

[0039] Figure 5 It is a simulation diagram of the output torque of the motor of the embodiment of the present application. It can be seen from the diagram that when the value k of Sr2 / Sr1 satisfies k=0.6826, the output torque of the motor is maximum.

[0040] In one embodiment, Sa=138°-138.5°.

[0041] Preferably, Sa = 138.3°. The optimized design of the angle Sa can prevent the magnetic flux density of the stator core teeth from being over-saturated, thereby ensuring the output torque of the motor.

[0042] In one embodiment, in a cross section perpendicular to the central axis of the stator core 1 , the outer radius of the stator core 1 is Sr1 , and the circumferential slot width of the tooth slot 2 is Sb, wherein Sb / Sr1 = 0.035-0.038.

[0043] Preferably, Sb / Sr1=0.036.

[0044] This width allows the flat wire conductor 3 with a sufficiently large cross section to be placed in the tooth slot 2 while preventing the magnetic flux density of the stator teeth from being over-saturated.

[0045] Figure 6 This is a simulation diagram of the stator tooth magnetic flux of the motor of the embodiment of the present application when Sb / Sr1=0.036. It can be seen from the figure that when the range of Sb / Sr1 meets the above-mentioned limitation, the tooth magnetic flux does not exceed the saturation value (2.0T), and will not cause the output torque to be reduced due to excessive saturation of the magnetic flux, thereby effectively ensuring the output torque of the motor.

[0046] In one embodiment, in a cross section perpendicular to the central axis of the stator core 1, the circumferential width of the flat wire conductor 3 is Cb, the radial width of the flat wire conductor 3 is Ch, the circumferential slot width of the tooth slot 2 is Sb, Sh / (Ch*8)=1.16-1.19, and / or, Sb / Cb=1.24-1.26.

[0047] Preferably, Sh / (Ch*8)=1.18, and / or, Sb / Cb=1.26.

[0048] This relationship can improve the slot fill rate on the basis of meeting the process production requirements, so that in the same tooth slot 2, the copper wire conductor area is larger, a stronger magnetic field strength is generated, and the power density is improved. In addition, the contact area between the flat wires is large, the thermal conductivity is better, and the temperature rise is lower.

[0049] In one embodiment, the stator core 1 has 48 tooth slots 2 distributed along the circumferential direction, and in each tooth slot 2, 8 flat wire conductors 3 are arranged along the radial direction of the stator core 1, and the cross-sections of the 8 flat wire conductors 3 are consistent, and all satisfy Sh / (Ch*8)=1.16-1.19, and Sb / Cb=1.24-1.26, so that the mutual matching relationship among the number of tooth slots of the stator core, the size design of each slot, and the number and size design of the flat wire conductors 3 in each slot can be optimized, so that the design of the tooth slot 2 can meet the larger area of ​​the flat wire conductor 3 while avoiding the problem of excessive magnetic density of the stator teeth and yoke, thereby effectively ensuring the output torque and power density of the motor.

[0050] According to an embodiment of the present application, the motor includes a motor stator, which is the motor stator described above.

[0051] In one embodiment, the outer radius of the stator of the motor is 230 mm, the peak power is 70Kw to 80Kw, and the peak speed is 9000rpm to 12000rpm. In this embodiment, the motor is particularly suitable for use as a motor for a 3-4.5t logistics vehicle.

[0052] According to an embodiment of the present application, a new energy vehicle includes the above-mentioned motor rotor or the above-mentioned motor.

[0053] It is easy for those skilled in the art to understand that, under the premise of no conflict, the above-mentioned advantageous methods can be freely combined and superimposed.

[0054] The above are only preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present application shall be included in the protection scope of the present application. The above are only preferred implementations of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and variations can be made without departing from the technical principles of the present application, and these improvements and variations should also be regarded as the protection scope of the present application.

Claims

1. A motor stator, characterized in that: The invention comprises a stator core (1), wherein the stator core (1) comprises a yoke and a tooth portion, wherein tooth slots (2) are formed between adjacent tooth portions, wherein a flat wire conductor (3) is arranged in the tooth slots (2), wherein the flat wire conductor (3) is wound around the tooth portion, wherein in a cross section perpendicular to the central axis of the stator core (1), the tooth slots (2) comprise a first side (21) located at the bottom of the slot, a second side (22) and a third side (23) located at both sides of the first side (21), a fourth side (24) located at a side of the second side (22) away from the first side (21), and a fifth side (25) located at a side of the third side (23) away from the first side (21), wherein an angle Sa is formed between the fourth side (24) and the fifth side (25), wherein the sum of the widths of the yoke and the tooth portion of the stator core (1) is b, the radial length of the tooth slots (2) is Sh, and the circumferential slot width of the tooth slots (2) is Sb, wherein 2. The motor stator according to claim 1, characterized in that:

3. The motor stator according to claim 1, characterized in that: The outer radius of the stator core (1) is Sr1, and the inner radius is Sr2, wherein Sr2 / Sr1=0.680-0.

685.

4. The motor stator according to claim 3, characterized in that: Sr2 / Sr1=0.6826.

5. The motor stator according to claim 1, characterized in that: Sa=138°~138.5°.

6. The motor stator according to claim 5, characterized in that: Sa=138.3°.

7. The motor stator according to claim 1, characterized in that: In a cross section perpendicular to the central axis of the stator core (1), the outer radius of the stator core (1) is Sr1, wherein Sb / Sr1=0.035-0.

038.

8. The motor stator according to claim 7, characterized in that: Sb / Sr1=0.

036.

9. The motor stator according to claim 1, characterized in that: In a cross section perpendicular to the central axis of the stator core (1), the circumferential width of the flat wire conductor (3) is Cb, the radial width of the flat wire conductor (3) is Ch, Sh / (Ch*8)=1.16-1.19, and / or Sb / Cb=1.24-1.

26.

10. The motor stator according to claim 9, characterized in that: Sh / (Ch*8)=1.18, and / or, Sb / Cb=1.

26.

11. The motor stator according to claim 1, characterized in that: The stator core (1) has 48 tooth slots (2) distributed along the circumferential direction, and in each tooth slot (2), eight flat wire conductors (3) are arranged along the radial direction of the stator core (1).

12. A motor, comprising a motor stator, characterized in that: The motor stator is the motor stator according to any one of claims 1 to 11.

13. The motor according to claim 12, characterized in that The stator outer radius of the motor is 230 mm, the peak power is 70Kw to 80Kw, and the peak speed is 9000rpm to 12000rpm.

14. A new energy vehicle, characterized in that: The invention comprises the motor stator according to any one of claims 1 to 11 or the motor according to claim 12 or 13.

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