Rotor assembly, permanent magnet synchronous motor and automobile

Abstract

The embodiment of the invention provides a rotor assembly, a permanent magnet synchronous motor and an automobile, and the rotor assembly comprises a first rotor iron core, a second rotor iron core, a permanent magnet assembly, and a magnetic adjusting winding. The second rotor iron core comprises an iron core yoke part and a plurality of iron core tooth parts which are arranged on the peripheral side of the iron core yoke part at intervals, the second rotor iron core is arranged in the first rotor iron core, and the iron core tooth parts and the first rotor iron core are arranged at intervals; the permanent magnet assemblies are in one-to-one correspondence with the iron core tooth parts, and the permanent magnet assemblies are arranged at intervals between the corresponding iron core tooth parts and the first rotor iron core, so that a closed straight-axis magnetic circuit is formed between every two adjacent permanent magnet assemblies; and the adjustable magnetic windings are in one-to-one correspondence with the iron core tooth parts, are wound on the corresponding iron core tooth parts and are positioned on the corresponding straight-axis magnetic circuits. According to the rotor assembly, the rotating speed of the permanent magnet synchronous motor can be increased, and meanwhile, the counter electromotive force is always kept below the protection limit of the controller.

Description

Technical Field

[0001] The present application relates to the technical field of permanent magnet synchronous motors, and in particular to a rotor assembly, a permanent magnet synchronous motor and a vehicle. Background Art

[0002] The requirements for power density of onboard drive motors of new energy vehicles are getting higher and higher. High power density means that the motor has a wider constant torque range at a wider speed, and the torque inflection point speed is widened to a higher speed, which improves the performance of the motor's peak power. Affected by the magnetic flux, the motor's back EMF will increase accordingly. High back EMF will not only narrow the motor's constant torque range, but also cause irreversible damage to the motor's external circuit, especially the controller, and in severe cases, burn out the controller. Summary of the invention

[0003] In view of this, the embodiments of the present application are intended to provide a rotor assembly, a permanent magnet synchronous motor and a vehicle, so as to increase the rotation speed of the permanent magnet synchronous motor while maintaining the back electromotive force below the controller protection limit at all times.

[0004] To achieve the above-mentioned object, a first aspect of an embodiment of the present application provides a rotor assembly, comprising:

[0005] a first rotor core;

[0006] a second rotor core, the second rotor core comprising a core yoke and a plurality of core teeth spaced apart on an outer peripheral side of the core yoke, the second rotor core being disposed in the first rotor core, and each of the core teeth being spaced apart from the first rotor core;

[0007] Permanent magnet assemblies corresponding to the core teeth one by one, each of the permanent magnet assemblies being arranged at a gap between the corresponding core teeth and the first rotor core, so that a closed direct-axis magnetic circuit is formed between two adjacent permanent magnet assemblies;

[0008] A magnetic flux regulating winding corresponding to the core teeth one by one, the magnetic flux regulating winding is wound on the corresponding core teeth and is located on the corresponding direct-axis magnetic circuit; the magnetic flux of the permanent magnet assembly is adjusted by adjusting the magnitude and direction of the current flowing through the magnetic flux regulating winding.

[0009] In some embodiments, the first rotor core has permanent magnet slots corresponding one-to-one to the core teeth, the slots of the permanent magnet slots face the corresponding core teeth, and at least part of the structure of the permanent magnet assembly is located in the permanent magnet slots.

[0010] In some embodiments, the first rotor core has relative inner and outer walls, and a partial area of ​​the inner wall is recessed to form a magnetic isolation bridge group corresponding to the permanent magnet assembly between the recessed area and the outer wall, and the magnetic isolation bridge group includes two magnetic isolation bridges arranged at intervals along the circumferential direction of the rotor assembly, and the two magnetic isolation bridges are respectively located at opposite ends of the permanent magnet assembly along the circumferential direction.

[0011] In some embodiments, the core tooth portion includes a tooth root segment connected to the core yoke portion and a tooth top segment located on the side of the tooth root segment away from the core yoke portion, the tooth top segment has a size along the circumferential direction of the rotor assembly greater than the tooth root segment along the circumferential direction of the rotor assembly, the permanent magnet assembly is located between the tooth top segment and the first rotor core, and the magnetic tuning winding is wound around the tooth root segment.

[0012] In some embodiments, a dimension of the tooth top segment along the circumferential direction is smaller than a dimension of the permanent magnet assembly along the circumferential direction.

[0013] In some embodiments, the permanent magnet assembly has a first surface and a second surface on opposite sides of the rotor assembly in the radial direction, the first surface faces the first rotor core, the second surface faces the core teeth, and the first surface and the second surface are both planar. In some embodiments, the first surface and the second surface are both perpendicular to the radial direction of the rotor assembly.

[0014] In some embodiments, the permanent magnet assembly includes a first permanent magnet and a second permanent magnet, the coercive force of the first permanent magnet is greater than the coercive force of the second permanent magnet, and the second permanent magnet is arranged on a side of the first permanent magnet close to the core tooth portion.

[0015] A second aspect of an embodiment of the present application provides a permanent magnet synchronous motor, comprising:

[0016] A stator assembly, the stator assembly comprising a stator core having an accommodating cavity and a stator winding arranged in the stator core, the stator winding being arranged on a circumferential side of the accommodating cavity;

[0017] The rotor assembly described above is rotatably disposed in the stator core, and the direct-axis magnetic circuit passes through the stator assembly.

[0018] In some embodiments, there are multiple stator windings, the stator core has stator slots corresponding to the stator windings, the stator slots are connected to the accommodating cavity, and each stator winding is respectively arranged in the corresponding stator slot.

[0019] A third aspect of an embodiment of the present application provides a vehicle, comprising the permanent magnet synchronous motor described above.

[0020] An embodiment of the present application provides a rotor assembly and a permanent magnet synchronous motor. The rotor assembly of the embodiment of the present application is provided with a first rotor core and a second rotor core. The permanent magnet assembly is arranged at the interval between the core teeth of the first rotor core and the second rotor core, so that a closed direct-axis magnetic circuit is formed between two adjacent permanent magnet assemblies. A magnetic adjustment winding is arranged on the core teeth and a demagnetization current is passed through the magnetic adjustment winding, so that the magnetic adjustment winding forms a demagnetization magnetic field in the opposite direction to the direct-axis magnetic circuit. The demagnetization magnetic field can reduce the equivalent magnetic flux of the permanent magnet assembly, thereby achieving the goal of increasing the speed of the permanent magnet synchronous motor while maintaining the back electromotive force below the controller protection limit. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A schematic diagram of the structure of a permanent magnet synchronous motor according to an embodiment of the present application;

[0022] Figure 2 for Figure 1 A schematic diagram of the structure of the rotor assembly shown;

[0023] Figure 3 for Figure 2 A schematic structural diagram of the first rotor core shown;

[0024] Figure 4 for Figure 3 A partial enlarged view of the middle A;

[0025] Figure 5 for Figure 2 A schematic structural diagram of the second rotor core shown;

[0026] Figure 6 for Figure 2 A schematic diagram of a partial structure of a rotor assembly shown;

[0027] Figure 7 for Figure 2 The structural schematic diagram of the first rotor core and the second rotor core is shown in the figure, and the marked path in the figure is the direct-axis magnetic circuit.

[0028] 10. Rotor assembly; 11. First rotor core; 11a. Permanent magnet slot; 11b. Inner wall; 11b1. Recessed area; 11c. Outer wall; 11d. First supporting surface; 111. Magnetic isolation bridge group; 1111. Magnetic isolation bridge; 12. Second rotor core; 121. Core yoke; 122. Core tooth; 122a. Second supporting surface; 1221. Tooth root section; 1222. Tooth top section; 13. Permanent magnet assembly; 13a. First surface; 13b. Second surface; 131. First permanent magnet; 132. Second permanent magnet; 14. Magnetic tuning winding; 20. Stator assembly; 21. Stator core; 21a. Accommodating cavity; 21b. Stator slot; 22. Stator winding. DETAILED DESCRIPTION

[0029] In the description of the embodiments of the present application, it should be noted that the terms "radial" and "circumferential" are based on the attached Figure 1 These directional terms are only used to facilitate the description of the embodiments of the present application and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the embodiments of the present application.

[0030] The present application provides a permanent magnet synchronous motor. Figure 1 and Figure 2 The permanent magnet synchronous motor includes a rotor assembly 10 and a stator assembly 20.

[0031] The stator assembly 20 includes a stator core 21 having an accommodation cavity 21 a and a stator winding 22 disposed in the stator core 21 . The stator winding 22 is disposed on the circumference of the accommodation cavity 21 a. The rotor assembly 10 is rotatably disposed in the stator core 21 .

[0032] The stator winding 22 is used to generate a rotating magnetic field, thereby driving the rotor assembly 10 to rotate relative to the stator core 21 .

[0033] For example, see Figure 1 There are multiple stator windings 22, and the stator core 21 has stator slots 21b corresponding to the stator windings 22. The stator slots 21b are connected to the accommodating cavity 21a, and each stator winding 22 is respectively arranged in the corresponding stator slot 21b.

[0034] The number of stator slots 21 b is not limited. Preferably, the number of stator slots 21 b is not less than three, and the number of stator slots 21 b is an integer multiple of three, so that the stator winding 22 is evenly distributed on the circumference of the stator core 21 to form a symmetrical three-phase stator winding 22. Figure 1 The stator core 21 shown has nine stator slots 21 b.

[0035] See also Figures 2 to 7 The rotor assembly 10 of the embodiment of the present application includes a first rotor core 11 , a second rotor core 12 , a permanent magnet assembly 13 and a magnetic tuning winding 14 .

[0036] The second rotor core 12 includes a core yoke 121 and a plurality of core teeth 122 spaced apart on the outer circumference of the core yoke 121 . The second rotor core 12 is disposed in the first rotor core 11 , and each core tooth 122 is spaced apart from the first rotor core 11 .

[0037] It can be understood that when the rotor assembly 10 is arranged in the stator core 21, the first rotor core 11 and the second rotor core 12 are coaxially arranged with the stator core 21, and the first rotor core 11 and the stator core 21 are spaced apart to form an air gap, so that the rotor assembly 10 can rotate in the stator core 21.

[0038] The first rotor core 11 and the second rotor core 12 are independent components, that is, the first rotor core 11 and the second rotor core 12 can be separated from each other.

[0039] The core yoke 121 is used to connect a plurality of core teeth 122. The core teeth 122 are used to support and limit the permanent magnet assembly 13 together with the first rotor core 11. The number of core teeth 122 is not limited. For example, please refer to Figure 2 and Figure 5 The number of the core teeth 122 is six, and the six core teeth 122 are evenly distributed on the outer peripheral side of the core yoke 121, that is, the angle θ between two adjacent core teeth 122 is 60°.

[0040] See also Figure 1 and Figure 2 The permanent magnet assemblies 13 correspond to the core teeth 122 one by one, and each permanent magnet assembly 13 is arranged at the interval between the corresponding core teeth 122 and the first rotor core 11, so that a closed direct-axis magnetic circuit is formed between two adjacent permanent magnet assemblies 13.

[0041] The permanent magnet assembly 13 is used to generate a stable magnetic field in the permanent magnet synchronous motor. The stable magnetic field interacts with the rotating magnetic field generated by the stator winding 22 , thereby causing the rotor assembly 10 to rotate relative to the stator core 21 .

[0042] The direct-axis magnetic circuit means that the magnetic field generated by the permanent magnet assembly 13 starts from the permanent magnet assembly 13, passes through the first rotor core 11 and the air gap in sequence, enters the stator core 21, and then passes through the air gap and the first rotor core 11 in sequence to return to the adjacent permanent magnet assembly 13, and then forms a closed loop through two adjacent core teeth 122. The magnetic field of the direct-axis magnetic circuit interacts with the rotating magnetic field of the stator winding 22 to generate electromagnetic torque, thereby driving the rotor assembly 10 to rotate. Please refer to Figure 7 The magnetic poles of two adjacent permanent magnet assemblies 13 are in opposite directions, that is, the N poles and S poles of two adjacent permanent magnet assemblies 13 are arranged in opposite directions, so that the magnetic field lines start from the N pole and flow to the S pole of the adjacent permanent magnet, thereby forming a closed direct-axis magnetic circuit.

[0043] The structure of the permanent magnet assembly 13 is not limited. For example, please refer to Figure 2 and Figure 6The permanent magnet assembly 13 may include a first permanent magnet 131 and a second permanent magnet 132 . The coercive force of the first permanent magnet 131 is greater than that of the second permanent magnet 132 . The second permanent magnet 132 is disposed on a side of the first permanent magnet 131 close to the core tooth portion 122 .

[0044] The first permanent magnet 131 has a relatively high coercive force and is used to provide a stable main magnetic field. The second permanent magnet 132 has a relatively low coercive force and can flexibly adjust the magnetization state through an external magnetic field, thereby changing the equivalent magnetic flux of the permanent magnet assembly 13 .

[0045] The number of permanent magnet assemblies 13 is not limited. For example, see Figure 1 and Figure 2 , the number of permanent magnet assemblies can be six.

[0046] Exemplarily, the pole arc angle of the permanent magnet assembly 13 may be 30° to 35.5° (including end points).

[0047] It is understandable that the distance H3 between the first rotor core 11 and the core teeth 122 can be designed according to the size of the permanent magnet assembly 13. Exemplarily, the distance H3 between the first rotor core 11 and the core teeth 122 is 5.7 mm to 6.3 mm.

[0048] The magnetic tuning winding 14 corresponds to the core teeth 122 one by one. The magnetic tuning winding 14 is wound on the corresponding core teeth 122 and is located on the corresponding direct-axis magnetic circuit. The magnetic flux of the permanent magnet assembly 13 is adjusted by adjusting the magnitude and direction of the current flowing through the magnetic tuning winding 14.

[0049] The magnetic flux regulating winding 14 is used to adjust the magnetic flux of the permanent magnet assembly 13. It is understandable that the direct axis magnetic circuit of the permanent magnet assembly 13 passes through the core tooth portion 122, and the magnetic flux regulating winding is wound around the core tooth portion 122, and a magnetic field for adjusting the magnetic flux of the permanent magnet assembly 13 can be formed after power is supplied.

[0050] Taking the improvement of the weak-field speed expansion of the permanent magnet synchronous motor as an example, it is necessary to widen the constant torque range of the motor, that is, the torque inflection point speed is expanded to a high speed, and a demagnetization current i0 is passed through the magnetic winding 14, and the current generates a demagnetization magnetic field H0. Since the demagnetization magnetic field H0 is in the opposite direction to the direct-axis magnetic circuit of the permanent magnet assembly 13, the demagnetization magnetic field H0 can weaken the magnetic flux of the permanent magnet assembly 13, thereby achieving weak-field speed expansion.

[0051] The demagnetizing magnetic field H0 satisfies the calculation formula H0=Ni0 / L e , where N is the number of turns of the magnetic winding 14, L e is the magnetic path length of the demagnetizing magnetic field H0. That is, by adjusting the number of coil turns N, the demagnetizing current i0 and the magnetic path length L eThe magnitude of the demagnetizing magnetic field H0 can be adjusted, wherein the demagnetizing magnetic field H0 can be adjusted relatively quickly and conveniently by adjusting the magnitude of the demagnetizing current i0.

[0052] In the embodiment where the permanent magnet assembly 13 includes the first permanent magnet 131 and the second permanent magnet 132, the coercive force of the second permanent magnet 132 is relatively low, so the demagnetizing magnetic field H0 can adjust the magnetization state of the second permanent magnet 132. Assuming that the magnetic induction intensity of the second permanent magnet 132 under the demagnetization effect is B0, then B0=B r2 -μ0μ r H0=B r2 -μH0, where μ0 is the vacuum permeability, μ0=4π×10 -7 H / m,μ r is the relative magnetic permeability of the permanent magnet, μ is the magnetic permeability of the permanent magnet, then the equivalent magnetic flux of the permanent magnet assembly 13 is Φ m =(B r1 +B r2 -μH0)A m , where B r1 is the remanence of the first permanent magnet 131, B r2 is the remanence of the second permanent magnet 132, A m is the radial cross-sectional area of ​​the rotor permanent magnet. That is, the demagnetizing magnetic field H0 can reduce the equivalent magnetic flux Φ of the permanent magnet assembly 13. m , thereby reducing the back EMF of the permanent magnet synchronous motor, so that while achieving weak magnetic field speed expansion, the back EMF is always controlled below the controller protection limit to prevent the back EMF from causing difficulty in weak magnetic field control and limiting the speed increase.

[0053] Similarly, the magnetic winding 14 can be switched to pass a magnetic current i1 in the opposite direction to the demagnetizing current i0. The magnetic field H1 generated by the magnetic current i1 is in the same direction as the direct-axis magnetic circuit of the permanent magnet assembly 13. Then the equivalent magnetic flux of the permanent magnet assembly 13 is Φ m =(B r1 +B r2 +μH1)A m It can be seen that the auxiliary magnetic field H1 can increase the equivalent magnetic flux Φ of the permanent magnet assembly 13. m , in order to increase the air gap magnetic density and adapt to the scenario of high torque density.

[0054] In summary, by adjusting the current magnitude and direction of the magnetic flux winding 14 , the rotor assembly 10 can exhibit different magnetic flux parameter requirements to meet various performance objectives of the motor.

[0055] It should be noted that, since two direct-axis magnetic circuits in opposite directions pass through the core tooth portion 122 , the demagnetizing magnetic field H0 and the auxiliary magnetic field H1 generated by the magnetic tuning winding 14 wound on the core tooth portion 122 can exert an influence on the two direct-axis magnetic circuits.

[0056] An embodiment of the present application also provides a car, comprising the permanent magnet synchronous motor provided by any embodiment of the present application.

[0057] The rotor assembly 10 of the embodiment of the present application is provided with a first rotor core 11 and a second rotor core 12, and the permanent magnet assembly 13 is arranged at the interval between the core teeth 122 of the first rotor core 11 and the second rotor core 12, so that a closed direct-axis magnetic circuit is formed between two adjacent permanent magnet assemblies 13, and a magnetic adjustment winding 14 is provided on the core teeth 122 and a demagnetization current is passed through the magnetic adjustment winding 14, so that the magnetic adjustment winding 14 forms a demagnetization magnetic field in the opposite direction to the direct-axis magnetic circuit. The demagnetization magnetic field can reduce the equivalent magnetic flux of the permanent magnet assembly 13, thereby achieving the goal of increasing the speed of the permanent magnet synchronous motor while keeping the back electromotive force always below the controller protection limit.

[0058] For some examples, see Figure 3 and Figure 6 The first rotor core 11 may have permanent magnet slots 11 a corresponding to the core teeth 122 , the slots of the permanent magnet slots 11 a face the corresponding core teeth 122 , and at least part of the structure of the permanent magnet assembly 13 is located in the permanent magnet slots 11 a .

[0059] The permanent magnet slot 11 a is used to accommodate the permanent magnet assembly 13 so as to support and limit the permanent magnet assembly 13 and prevent the permanent magnet assembly 13 from being displaced when rotating with the rotor assembly 10 .

[0060] Figure 6 Part of the permanent magnet assembly 13 shown is located in the permanent magnet slot 11a, while another part is located outside the slot and abuts against the core teeth 122. In another embodiment, the permanent magnet assembly 13 can be entirely located in the permanent magnet slot 11a, and the core teeth 122 abut against the core teeth 122 at the slot.

[0061] The size of the permanent magnet slot 11a is not limited. For example, the circumferential width dimension H1 of the permanent magnet slot 11a can be 17.5 mm to 19.6 mm (including the endpoint values), the radial slot depth can be 4.2 mm to 6.1 mm (including the endpoint values), and the pole arc angle can be 30° to 35.5° (including the endpoint values).

[0062] To reduce magnetic resistance, the maximum thickness H2 from the bottom wall of the permanent magnet slot 11 a to the outer wall 11 c of the first rotor core 11 may be less than 3.8 mm.

[0063] For some examples, see Figure 3 and Figure 4The first rotor core 11 has a relative inner wall 11b and an outer wall 11c, and a partial area of ​​the inner wall 11b is recessed to form a magnetic isolation bridge group 111 corresponding to the permanent magnet assembly 13 between the recessed area 11b1 and the outer wall 11c. That is to say, the magnetic isolation bridge group 111 is located in the peripheral edge area of ​​the first rotor core 11, which is used to suppress magnetic leakage and improve the air gap magnetic density efficiency.

[0064] Please continue reading Figure 3 and Figure 4 The magnetic isolation bridge group 111 may include two magnetic isolation bridges 1111 spaced apart along the circumference of the rotor assembly 10, and the two magnetic isolation bridges 1111 are respectively located at opposite ends of the circumference of the permanent magnet assembly 13. That is to say, one permanent magnet assembly 13 corresponds to two magnetic isolation bridges 1111, and the two magnetic isolation bridges 1111 are respectively located on opposite sides of the direct-axis magnetic circuit of the permanent magnet assembly 13 to limit the lateral diffusion of the magnetic flux, so that the magnetic field acts on the stator winding 22 through the air gap along a preset path.

[0065] It can be understood that by controlling the depth of the recessed area 11b1, the radial thickness of the two magnetic isolation bridges 1111 can be controlled.

[0066] The thickness of the magnetic isolation bridge 1111 is not limited. Exemplarily, the thickness of the magnetic isolation bridge 1111 can be 0.85 mm to 1.25 mm (including the end points).

[0067] See also Figure 3 and Figure 4 , the recessed area 11b1 may be connected to the permanent magnet slot 11a.

[0068] For some examples, see Figure 2 , Figures 5 to 7 The core tooth portion 122 may include a tooth root segment 1221 connected to the core yoke portion 121 and a tooth top segment 1222 located on the side of the tooth root segment 1221 away from the core yoke portion 121, the tooth top segment 1222 having a circumferential dimension of the rotor assembly 10 being greater than the tooth root segment 1221 having a circumferential dimension of the rotor assembly 10, the permanent magnet assembly 13 being located between the tooth top segment 1222 and the first rotor core 11, and the magnetic modulation winding 14 being wound around the tooth root segment 1221.

[0069] The size of the tooth top section 1222 along the circumferential direction of the rotor assembly 10 is greater than the size of the tooth root section 1221 along the circumferential direction of the rotor assembly 10, which can not only increase the contact area between the core tooth portion 122 and the permanent magnet assembly 13 and enhance the installation stability of the permanent magnet assembly 13, but also reduce the magnetic resistance and improve the magnetic field distribution of the permanent magnet assembly 13 to make it more uniform.

[0070] Exemplarily, the circumferential dimension of the tooth top segment 1222 may be smaller than the circumferential dimension of the permanent magnet assembly 13 , for example, may be smaller than 1.8 mm, so as to facilitate the installation of the permanent magnet assembly between the first rotor core 11 and the tooth top segment 1222 .

[0071] For some examples, see Figures 2 to 6 The permanent magnet assembly 13 has a first surface 13a and a second surface 13b on opposite sides of the rotor assembly in the radial direction, respectively. The first surface 13a faces the first rotor core 11, and the second surface 13b faces the core tooth portion 122. The first surface 13a and the second surface 13b can both be planar. In another embodiment, the first surface 13a and the second surface 13b can also be curved.

[0072] See also Figures 2 to 6 The first rotor core 11 has a first supporting surface 11d that matches the first surface 13a, and the core tooth portion 122 has a second supporting surface 122a that matches the second surface 13b. The shape of the first supporting surface 11d is the same as that of the first surface 13a, and the shape of the second supporting surface 122a is the same as that of the second surface 13b, so as to improve the installation stability of the permanent magnet assembly 13.

[0073] See also Figures 2 to 6 The first surface 13a and the second surface 13b can be both perpendicular to the radial direction of the rotor assembly 10, that is, the first surface 13a and the second surface 13b are parallel to each other, the permanent magnet assembly 13 is arranged in a straight line between the core teeth 122 of the first rotor core 11 and the second rotor core 12, the direction of the magnetic field direct axis of the permanent magnet assembly 13 is parallel to the radial direction of the rotor assembly 10, the waveform of the air gap magnetic density is relatively uniform, and the magnetic field distribution has good symmetry.

[0074] Exemplarily, the permanent magnet assembly 13 has a first side surface and a second side surface that are located between the first supporting surface 11d and the second supporting surface 122a and are opposite to each other, and the first side surface and the second side surface are parallel to each other. For an embodiment in which the first rotor core 11 has a permanent magnet slot 11a, the two sides of the permanent magnet slot 11a that are opposite to the first side and the second side are also parallel to each other.

[0075] In the description of the present application, the description with reference to the terms "in one embodiment", "in some embodiments", "in other embodiments", "in yet other embodiments", or "exemplary" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiments of the present application. In the present application, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. In addition, those skilled in the art may combine the different embodiments or examples described in the present application and the features of the different embodiments or examples without contradiction.

[0076] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application are included in the protection scope of the present application.

Claims

1. A rotor assembly, characterized in that: include: a first rotor core; a second rotor core, the second rotor core comprising a core yoke and a plurality of core teeth spaced apart on an outer peripheral side of the core yoke, the second rotor core being disposed in the first rotor core, and each of the core teeth being spaced apart from the first rotor core; Permanent magnet assemblies corresponding to the core teeth one by one, each of the permanent magnet assemblies being arranged at a gap between the corresponding core teeth and the first rotor core, so that a closed direct-axis magnetic circuit is formed between two adjacent permanent magnet assemblies; A magnetic flux regulating winding corresponding to the core teeth one by one, the magnetic flux regulating winding is wound on the corresponding core teeth and is located on the corresponding direct-axis magnetic circuit; the magnetic flux of the permanent magnet assembly is adjusted by adjusting the magnitude and direction of the current flowing through the magnetic flux regulating winding.

2. The rotor assembly according to claim 1, characterized in that: The first rotor core has permanent magnet slots corresponding to the core teeth one by one, the slot openings of the permanent magnet slots face the corresponding core teeth, and at least a part of the structure of the permanent magnet assembly is located in the permanent magnet slots.

3. The rotor assembly according to claim 1 or 2, characterized in that: The first rotor core has relative inner and outer walls, and a partial area of ​​the inner wall is recessed to form a magnetic isolation bridge group corresponding to the permanent magnet assembly one by one between the recessed area and the outer wall. The magnetic isolation bridge group includes two magnetic isolation bridges arranged at intervals along the circumferential direction of the rotor assembly, and the two magnetic isolation bridges are respectively located at opposite ends of the permanent magnet assembly along the circumferential direction.

4. The rotor assembly according to claim 1 or 2, characterized in that: The core tooth portion includes a tooth root section connected to the core yoke section and a tooth top section located on the side of the tooth root section away from the core yoke section, the size of the tooth top section along the circumferential direction of the rotor assembly is larger than the size of the tooth root section along the circumferential direction of the rotor assembly, the permanent magnet assembly is located between the tooth top section and the first rotor core, and the magnetic modulation winding is wound on the tooth root section.

5. The rotor assembly according to claim 4, characterized in that: A dimension of the tooth tip segment along the circumferential direction is smaller than a dimension of the permanent magnet assembly along the circumferential direction.

6. The rotor assembly according to claim 1 or 2, characterized in that: The permanent magnet assembly has a first surface and a second surface on opposite sides of the rotor assembly in the radial direction, respectively. The first surface faces the first rotor core, and the second surface faces the core teeth. Both the first surface and the second surface are planar.

7. The rotor assembly according to claim 6, characterized in that: The first surface and the second surface are both perpendicular to the radial direction of the rotor assembly.

8. The rotor assembly according to claim 1 or 2, characterized in that: The permanent magnet assembly includes a first permanent magnet and a second permanent magnet. The coercive force of the first permanent magnet is greater than the coercive force of the second permanent magnet. The second permanent magnet is arranged on a side of the first permanent magnet close to the core tooth portion.

9. A permanent magnet synchronous motor, characterized in that: include: A stator assembly, the stator assembly comprising a stator core having an accommodating cavity and a stator winding arranged in the stator core, the stator winding being arranged on a circumferential side of the accommodating cavity; The rotor assembly according to any one of claims 1 to 8 is rotatably disposed in the stator core, and the direct-axis magnetic circuit passes through the stator assembly.

10. The permanent magnet synchronous motor according to claim 9, characterized in that: There are multiple stator windings, the stator core has stator slots corresponding to the stator windings, the stator slots are connected to the accommodating cavity, and each stator winding is respectively arranged in the corresponding stator slot.

11. A vehicle, characterized in that: Including the permanent magnet synchronous motor as described in claim 9 or 10.

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