Rotor assembly, electric machine and vehicle

Abstract

The present disclosure relates to a rotor assembly, an electric machine and a vehicle, the rotor assembly comprising a rotor core, a first magnetic member and a magnetic adjusting component, the rotor core is provided with a first accommodating groove and a second accommodating groove, the first magnetic member is arranged in the first accommodating groove, the first accommodating groove is filled with a filling material, the first magnetic member is fixedly connected to the rotor core through the filling material, the magnetic adjusting component is arranged in the second accommodating groove, the second accommodating groove is filled with a filling material, the magnetic adjusting component is fixedly connected to the rotor core through the filling material, the direction of the magnetic induction lines of the magnetic field generated by the magnetic adjusting component is arranged to be adjustable, and the cooperation of the magnetic adjusting component and the first magnetic member can increase or reduce the total magnetic flux of the rotor assembly. The first magnetic member and the magnetic adjusting component are fixed by the filling material respectively, so that there is no movable structure in the rotor assembly, and no problems such as shaking noise and the like will occur with the rotation of the rotor assembly, thereby improving the NVH performance.

Description

Technical Field

[0001] This disclosure relates to the field of electric motor manufacturing technology, and more particularly to a rotor assembly, an electric motor, and a vehicle. Background Technology

[0002] In related technologies, permanent magnet synchronous motors use mechanical devices to adjust the magnetization to change the permanent magnet flux. The mechanical magnetization device is a movable part set on the rotor, which may cause it to shake when the motor is working, potentially leading to NVH problems. Summary of the Invention

[0003] The purpose of this disclosure is to provide a rotor assembly, an electric motor, and a vehicle to solve the problems in the aforementioned related technologies.

[0004] To achieve the above objectives, one aspect of this disclosure provides a rotor assembly comprising: The rotor core is provided with a first receiving groove and a second receiving groove; A first magnetic component is disposed in a first receiving groove filled with a filling material, and the first magnetic component is fixedly connected to the rotor core through the filling material. A magnetic adjustment component is disposed in the second accommodating groove, which is filled with the filling material. The magnetic adjustment component is fixedly connected to the rotor core through the filling material. The direction of the magnetic field lines generated by the magnetic adjustment component is adjustable. The cooperation between the magnetic adjustment component and the first magnetic component can increase or decrease the total magnetic flux of the rotor assembly.

[0005] In the above technical solution, the magnetic adjustment component can adjust the permanent magnet flux of the entire rotor assembly in conjunction with the first magnetic component. By reducing the permanent magnet flux from the rotor assembly, the amount of weak magnetic current supplied to the stator assembly can be reduced or eliminated, thus reducing unnecessary copper and iron losses and improving the high-speed efficiency of the motor. The first and second receiving slots, along with the filling material, are used to fix the first magnetic component and the magnetic adjustment component respectively, completely fixing them relative to the rotor assembly. Therefore, there are no movable structures within the rotor assembly, and as the rotor assembly rotates, there will be no shaking or abnormal noise, improving NVH performance.

[0006] In some possible implementations, the magnetizing component includes a magnetizing coil and a second magnetic element, wherein the magnetizing coil is configured to be able to pass a pulse current to magnetize or demagnetize the second magnetic element; The magnetizing component includes a magnetizing state and a demagnetizing state. In the magnetizing state, the current in the magnetizing coil is transmitted along a first direction, and the direction of the magnetic field lines of the magnetic field generated by the magnetizing component is the same as the direction of the magnetic field lines of the magnetic field of the first magnetic component. In the demagnetized state, the current in the magnetizing coil is transmitted along the second direction, and the direction of the magnetic field lines of the magnetic field generated by the magnetizing component is opposite to the direction of the magnetic field lines of the magnetic field of the first magnetic component. The first direction and the second direction are opposite.

[0007] By using this setup, a pulsed current is applied to magnetize or demagnetize the magnetizer. The pulsed current has a short duration and generates very little loss, thus greatly reducing losses while ensuring the magnetization effect.

[0008] In some possible implementations, the first magnetic element includes a high coercivity magnet, the second magnetic element includes a low coercivity magnet, and the tuning coil is wound around the low coercivity magnet.

[0009] This setup facilitates the magnetization or demagnetization of low-coercivity magnets without affecting the magnetic field of high-coercivity magnets.

[0010] In some possible implementations, the magnetic circuit of the magnetic field of the first magnetic element and the magnetic circuit of the magnetic field generated by the magnetizing component are connected in series and / or in parallel.

[0011] This configuration allows for the adaptation to different motor layout requirements.

[0012] In some possible implementations, in a third-party direction, at least a portion of the first magnetic element is arranged side by side with at least a portion of the second magnetic element, such that the magnetic circuit of the first magnetic element is connected in series with the magnetic circuit of the magnetic field generated by the magnetizing component. In the magnetized state, the magnetic field of the first magnetic element is superimposed on the magnetic field generated by the magnetizing component; in the demagnetized state, a portion of the magnetic field of the first magnetic element cancels out the magnetic field generated by the magnetizing component. The third direction is defined as the extension direction of the magnetic field lines of the magnetic field of the first magnetic element.

[0013] This configuration facilitates the connection of the magnetic circuit of the first magnetic component with the magnetic field generated by the magnetizing component.

[0014] In some possible implementations, in the fourth direction, at least a portion of the first magnetic element is arranged side by side with at least a portion of the second magnetic element, such that the magnetic circuit of the first magnetic element is connected in parallel with the magnetic circuit of the magnetic field generated by the magnetizing component. In the magnetized state, the magnetic field of the first magnetic element is superimposed on the magnetic field generated by the magnetizing component. In the demagnetized state, a portion of the magnetic field lines of the first magnetic element directly close with the magnetic field lines of the magnetic field generated by the magnetizing component to form a closed magnetic circuit. The fourth direction is set at an angle to the third direction, and the third direction is set as the extension direction of the magnetic field lines of the magnetic field of the first magnetic element.

[0015] This configuration facilitates the parallel connection of the magnetic circuit of the first magnetic component with the magnetic circuit of the magnetic field generated by the magnetizing component.

[0016] In some possible implementations, the first magnetic element includes a first component and a second component, which are spaced apart. In a third direction, at least a portion of the first component is arranged side by side with at least a portion of the second magnetic component, such that the magnetic circuit of the first component is connected in series with the magnetic circuit of the magnetic field generated by the magnetizing component; In the fourth direction, at least a portion of the second member is arranged side by side with at least a portion of the second magnetic element, such that the magnetic circuit of the second member is connected in parallel with the magnetic circuit of the magnetic field generated by the magnetizing component; In the magnetized state, the magnetic field of the first component is superimposed with the magnetic field generated by the magnetizing component, and the magnetic field of the second component is superimposed with the magnetic field generated by the magnetizing component. In the demagnetized state, a portion of the magnetic field lines of the first component cancel out the magnetic field lines of the magnetic field generated by the magnetizing component, and a portion of the magnetic field lines of the second component directly close with the magnetic field lines of the magnetic field generated by the magnetizing component to form a magnetic circuit with closed magnetic flux. The fourth direction is set at an angle to the third direction, and the third direction is set as the extension direction of the magnetic field lines of the magnetic field of the first magnetic element.

[0017] This configuration facilitates the series-parallel hybrid connection of the magnetic circuit of the first magnetic component and the magnetic field generated by the magnetizing component.

[0018] In some possible implementations, there are multiple first magnetic elements, forming multiple groups of first magnetic element groups. The multiple groups of first magnetic element groups are spaced apart along the circumferential direction of the rotor assembly. The magnetic circuit of each group of first magnetic element groups is closed to form a ring magnetic circuit. The magnetic adjustment component is provided between each two adjacent groups of first magnetic element groups, and the multiple magnetic adjustment components are spaced apart.

[0019] With this configuration, multiple magnetic adjustment components can cooperate with different groups of first magnetic components to adjust the permanent magnet flux of the entire rotor assembly.

[0020] In some possible implementations, the filler material includes plastic; The first magnetic component is fixedly connected to the rotor core by injection molding of the plastic. The magnetic adjustment component is fixedly connected to the rotor core by injection molding.

[0021] This setup results in low manufacturing costs, facilitates processing, and allows for the fixation of the first magnetic component and the magnetic adjustment component without affecting the magnetic field.

[0022] A second aspect of this disclosure also provides an electric motor including the rotor assembly described above.

[0023] A second aspect of this disclosure also provides a vehicle that includes the rotor assembly described above, or that includes the electric motor described above.

[0024] Other features and advantages of this disclosure will be described in detail in the following detailed description section. Attached Figure Description

[0025] The accompanying drawings are provided to further illustrate the present disclosure and form part of the specification. They are used together with the following detailed description to explain the present disclosure, but do not constitute a limitation thereof. In the drawings: Figure 1 This is a schematic diagram of the rotor assembly according to one embodiment of the present disclosure, wherein the first magnetic component and the magnetic adjustment component are arranged in a series-parallel hybrid configuration.

[0026] Figure 2 This is a partial structural schematic diagram of the cooperation relationship between the rotor assembly and the stator assembly according to one embodiment of the present disclosure, wherein the first magnetic component and the magnetic adjustment component are arranged in a series-parallel hybrid configuration.

[0027] Figure 3 This is a schematic diagram of the structure of the first magnetic element and the magnetic adjustment component in one embodiment of the present disclosure, wherein the magnetic field lines are in the same direction. The first magnetic element and the magnetic adjustment component are arranged in a series-parallel hybrid configuration, and the arrows in the figure indicate the direction of the magnetic field lines.

[0028] Figure 4 yes Figure 3 A schematic diagram of a magnetic circuit in which the first magnetic component and the tuning component are connected in series and parallel, wherein F in the diagram HCF It is the magnetomotive force of the first magnetic component, R HCF It is the magnetic reluctance of the first magnetic component, F LCF It is the magnetomotive force of the second magnetic component, R LCF It is the magnetoresistive force of the second magnetic component, R. Airgap It is the air gap reluctance, φ PM It is a permanent magnet flux.

[0029] Figure 5 yes Figure 3 The diagram shows the structure of the magnetic field of the first magnetic component and the magnetic adjustment component. The diagram shows the arrangement of the first magnetic component and the magnetic adjustment component in series and parallel connection. The dotted line in the diagram indicates the direction of the magnetic field.

[0030] Figure 6 This is a schematic diagram of the structure of the first magnetic element and the magnetic adjustment component in one embodiment of the present disclosure, wherein the magnetic field lines of the first magnetic element and the magnetic adjustment component are arranged in series and parallel, and the arrows in the figure indicate the direction of the magnetic field lines.

[0031] Figure 7 yes Figure 6 A schematic diagram of a magnetic circuit in which the first magnetic component and the tuning component are connected in series and parallel, wherein F in the diagram HCF It is the magnetomotive force of the first magnetic component, R HCF It is the magnetic reluctance of the first magnetic component, F LCF It is the magnetomotive force of the second magnetic component, R LCF It is the magnetoresistive force of the second magnetic component, R. Airgap It is the air gap reluctance, φ PM It is a permanent magnet flux.

[0032] Figure 8 yes Figure 6 The diagram shows the structure of the magnetic field of the first magnetic component and the magnetic adjustment component. The diagram shows the arrangement of the first magnetic component and the magnetic adjustment component in series and parallel connection. The dotted line in the diagram indicates the direction of the magnetic field.

[0033] Figure 9 This is a schematic diagram of the rotor assembly according to one embodiment of the present disclosure, wherein the first magnetic element and the magnetic adjustment component are arranged in series.

[0034] Figure 10 This is a partial structural schematic diagram of the cooperation relationship between the rotor assembly and the stator assembly according to one embodiment of the present disclosure, wherein the first magnetic component and the magnetic adjustment component are arranged in series.

[0035] Figure 11 This is a schematic diagram of the structure of the first magnetic element and the magnetic adjustment component in one embodiment of the present disclosure, wherein the magnetic field lines of the first magnetic element and the magnetic adjustment component are in the same direction. The arrows in the figure indicate the direction of the magnetic field lines.

[0036] Figure 12 yes Figure 11 A schematic diagram of a magnetic circuit in which the first magnetic component and the tuning component are connected in series, wherein F in the diagram HCF It is the magnetomotive force of the first magnetic component, R HCF It is the magnetic reluctance of the first magnetic component, F LCF It is the magnetomotive force of the second magnetic component, R LCFIt is the magnetoresistive force of the second magnetic component, R. Airgap It is the air gap reluctance, φ PM It is a permanent magnet flux.

[0037] Figure 13 yes Figure 11 The diagram shows the structure of the magnetic field of the first magnetic component and the magnetic adjustment component, where the first magnetic component and the magnetic adjustment component are arranged in series, and the dotted line in the diagram indicates the direction of the magnetic field.

[0038] Figure 14 This is a schematic diagram of the structure of the first magnetic element and the magnetic adjustment component in one embodiment of the present disclosure, wherein the magnetic field lines of the first magnetic element and the magnetic adjustment component are arranged in series, and the arrows in the figure indicate the direction of the magnetic field lines.

[0039] Figure 15 yes Figure 14 A schematic diagram of a magnetic circuit in which the first magnetic component and the tuning component are connected in series, wherein F in the diagram HCF It is the magnetomotive force of the first magnetic component, R HCF It is the magnetic reluctance of the first magnetic component, F LCF It is the magnetomotive force of the second magnetic component, R LCF It is the magnetoresistive force of the second magnetic component, R. Airgap It is the air gap reluctance, φ PM It is a permanent magnet flux.

[0040] Figure 16 yes Figure 14 The diagram shows the structure of the magnetic field of the first magnetic component and the magnetic adjustment component, where the first magnetic component and the magnetic adjustment component are arranged in series, and the dotted line in the diagram indicates the direction of the magnetic field.

[0041] Figure 17 This is a schematic diagram of the rotor assembly according to one embodiment of the present disclosure, wherein the first magnetic element and the magnetic adjustment element are arranged in parallel.

[0042] Figure 18 This is a partial structural schematic diagram of the cooperation relationship between the rotor assembly and the stator assembly according to one embodiment of the present disclosure, wherein the first magnetic component and the magnetic adjustment component are arranged in parallel.

[0043] Figure 19 This is a schematic diagram of a structure in which the magnetic field lines of the first magnetic element and the magnetic adjustment component are in the same direction according to an embodiment of the present disclosure. The diagram shows the first magnetic element and the magnetic adjustment component arranged in parallel, and the arrows in the diagram indicate the direction of the magnetic field lines.

[0044] Figure 20 yes Figure 19 A schematic diagram of a magnetic circuit in which the first magnetic component and the adjusting component are connected in parallel, wherein F in the diagram HCF It is the magnetomotive force of the first magnetic component, RHCF It is the magnetic reluctance of the first magnetic component, F LCF It is the magnetomotive force of the second magnetic component, R LCF It is the magnetoresistive force of the second magnetic component, R. Airgap It is the air gap reluctance, φ PM It is a permanent magnet flux.

[0045] Figure 21 yes Figure 19 The diagram shows the structure of the magnetic field of the first magnetic component and the magnetic adjustment component, where the first magnetic component and the magnetic adjustment component are arranged in parallel, and the dotted line in the diagram indicates the direction of the magnetic field.

[0046] Figure 22 This is a schematic diagram of the structure of the first magnetic element and the magnetic adjustment component in one embodiment of the present disclosure, wherein the magnetic field lines of the first magnetic element and the magnetic adjustment component are arranged in parallel, and the arrows in the figure indicate the direction of the magnetic field lines.

[0047] Figure 23 yes Figure 22 A schematic diagram of a magnetic circuit in which the first magnetic component and the adjusting component are connected in parallel, wherein F in the diagram HCF It is the magnetomotive force of the first magnetic component, R HCF It is the magnetic reluctance of the first magnetic component, F LCF It is the magnetomotive force of the second magnetic component, R LCF It is the magnetoresistive force of the second magnetic component, R. Airgap It is the air gap reluctance, φ PM It is a permanent magnet flux.

[0048] Figure 24 yes Figure 22 The diagram shows the structure of the magnetic field of the first magnetic component and the magnetic adjustment component, where the first magnetic component and the magnetic adjustment component are arranged in parallel, and the dotted line in the diagram indicates the direction of the magnetic field.

[0049] Explanation of reference numerals in the attached figures 1. Rotor core; 11. First receiving slot; 12. Second receiving slot; 2. First magnetic component; 21. First component; 22. Second component; 23. First magnetic component group; 3. Magnetic adjustment component; 31. Magnetic adjustment coil; 32. Second magnetic component; 4. Coil windings; 5. Stator core. Detailed Implementation

[0050] The specific embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit this disclosure.

[0051] In this disclosure, unless otherwise stated, directional terms such as "third direction" and "fourth direction" are used. Figure 1 , Figure 9 and Figure 17 The diagram illustrates the direction of current flow, with "first direction" and "second direction" indicating the direction of current flow, and "inner" and "outer" referring to the inner and outer parts of the relevant components. Furthermore, the terms "first," "second," etc., are used only for descriptive distinction and should not be interpreted as indicating or implying relative importance.

[0052] In the description of this disclosure, it should also be noted that, unless otherwise expressly specified and limited, the terms "setup" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can be a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this disclosure according to the specific circumstances.

[0053] In related technologies, the permanent magnet flux of a permanent magnet synchronous motor is constant, requiring the introduction of an additional field-weakening current into the stator. This results in additional copper losses and reduced motor efficiency. Specifically, the back electromotive force of a permanent magnet synchronous motor increases with speed, causing the voltage on the motor side to exceed the inverter voltage limit. Therefore, when the motor is running at high speed, a continuous field-weakening current needs to be supplied to the stator for field-weakening control to ensure that the voltage on the motor side does not exceed the inverter voltage limit. However, this field-weakening current leads to additional copper losses, reducing the motor's high-speed efficiency.

[0054] Of course, there are also variable flux motors that use mechanical devices to adjust the magnetic field. The mechanical magnetic adjustment device is a movable part set on the rotor, which may cause it to shake when the motor is working, which may lead to NVH problems.

[0055] Therefore, such as Figures 1-24 As shown, one aspect of this disclosure provides a rotor assembly, including a rotor core 1, a first magnetic element 2, and a magnetic adjustment component 3.

[0056] The rotor core 1 is provided with a first receiving groove 11 and a second receiving groove 12. A first magnetic element 2 is disposed in the first receiving groove 11, which is filled with a filling material. The first magnetic element 2 is fixedly connected to the rotor core 1 through the filling material. It can be understood that the first receiving groove 11 is used to accommodate the first magnetic element 2.

[0057] The magnetic adjustment component 3 is disposed within the second receiving groove 12, which is filled with a filler material. The magnetic adjustment component 3 is fixedly connected to the rotor core 1 via the filler material. The direction of the magnetic field lines generated by the magnetic adjustment component 3 is adjustable. The cooperation between the magnetic adjustment component 3 and the first magnetic component 2 can increase or decrease the total magnetic flux of the rotor assembly. It is understood that the second receiving groove 12 is used to house the magnetic adjustment component 3. The first receiving groove 11 and the second receiving groove 12 may not be connected.

[0058] In the above technical solution, the magnetic adjustment component 3 can play a magnetic adjustment role, cooperating with the first magnetic component 2 to adjust the permanent magnet flux of the entire rotor assembly. That is, the magnetic adjustment component 3 can generate a magnetic field. When the magnetic field generated by the magnetic adjustment component 3 and the magnetic field of the first magnetic component 2 are superimposed, the permanent magnet flux is increased, maximizing the permanent magnet flux and enhancing the motor's torque output capability. When a portion of the magnetic field generated by the magnetic adjustment component 3 and the magnetic field of the first magnetic component 2 cancel each other out, or when the magnetic field generated by the magnetic adjustment component 3 shuns a portion of the magnetic field lines of the first magnetic component 2, the permanent magnet flux is reduced, minimizing the permanent magnet flux and reducing the back EMF of the motor, thus preventing the voltage on the motor side from exceeding the inverter voltage limit. This rotor assembly generates a magnetic field through the magnetic adjustment component 3, achieving a magnetic adjustment effect. By reducing the permanent magnet flux from the rotor assembly level, the need for weak magnetic current to be supplied to the stator assembly can be reduced or eliminated, reducing unnecessary copper and iron losses and improving the high-speed efficiency of the motor.

[0059] Furthermore, since the rotor assembly is rotatable and its rotational speed varies, the magnetizing component 3, located within the rotor assembly, needs to be prevented from moving to avoid abnormal noise and affecting NVH performance. Therefore, this rotor assembly uses a first receiving groove 11 and a second receiving groove 12, in conjunction with filling material, to fix the first magnetic component 2 and the magnetizing component 3 respectively. This completely fixes the first magnetic component 2 and the magnetizing component 3 relative to the rotor assembly, eliminating any movable structures within the rotor assembly. As the rotor assembly rotates, there will be no shaking or abnormal noise, thus improving NVH performance. It is understood that the filling material fills the first receiving groove 11 and the second receiving groove 12, filling the gaps between the first magnetic component 2 and the first receiving groove 11, and between the magnetizing component 3 and the second receiving groove 12, thereby fixing the first magnetic component 2 and the magnetizing component 3.

[0060] Optionally, in one embodiment of this disclosure, the magnetic adjustment component 3 includes a magnetic adjustment coil 31 and a second magnetic element 32. The magnetic adjustment coil 31 is configured to receive a pulse current to magnetize or demagnetize the second magnetic element 32. By receiving a pulse current into the magnetic adjustment coil 31, the coil generates a magnetic field, which in turn magnetizes or demagnetizes the second magnetic element 32. This allows the direction of the magnetic field lines of the entire magnetic adjustment component 3 to be adjusted, thus cooperating with the first magnetic element 2 to regulate the magnetic flux of the entire rotor assembly.

[0061] Among the related technologies, some use a continuous DC current to magnetize or weaken the stator assembly. However, the losses from a continuous DC current are relatively large. In contrast, this rotor assembly arranges the magnetizing coil 31 on the rotor core 1 and magnetizes or demagnetizes by applying a pulse current. The pulse current has a short duration and generates very little loss, thus greatly reducing losses while ensuring the magnetizing effect. In addition, the magnetizing coil 31 is arranged on the rotor core 1, and the magnetizing or demagnetizing magnetic field it generates acts as a permanent magnet flux on the rotor assembly, having little impact on the magnetic field of the stator core 5, the stator windings 4, and the stator assembly, and thus minimal impact on the motor's operating state.

[0062] It is understood that the magnetizing component 3 includes a magnetizing state and a demagnetizing state. In the magnetizing state, the current in the magnetizing coil 31 is transmitted along the first direction, and the direction of the magnetic field lines of the magnetic field generated by the magnetizing component 3 is the same as the direction of the magnetic field lines of the magnetic field of the first magnetic element 2. Therefore, in the magnetizing state, the magnetic field generated by the magnetizing component 3 and the magnetic field of the first magnetic element 2 can be superimposed, thereby increasing the permanent magnet flux of the entire rotor assembly. This is suitable for use when the motor is running at low speed, which can improve the torque output capability.

[0063] In the demagnetized state, the current in the magnetizing coil 31 is transmitted along the second direction, and the direction of the magnetic field lines generated by the magnetizing component 3 is opposite to the direction of the magnetic field lines of the first magnetic component 2. Specifically, the first direction and the second direction are opposite.

[0064] Therefore, in the demagnetized state, the magnetic field generated by the magnetizing component 3 can cancel out a portion of the magnetic field of the first magnetic component 2, or shunt and close a portion of the magnetic field of the first magnetic component 2, thereby reducing the permanent magnet flux of the entire rotor assembly. This is applicable to motors operating at high speeds. At this time, the weak magnetic current in the coil winding 4 of the stator assembly can be reduced, resulting in reduced copper losses. In addition, the permanent magnet flux of the rotor assembly is reduced, and the iron losses are also reduced, which can improve the efficiency of the motor.

[0065] To ensure that the adjustment component 3 and the first magnetic component 2 work together to adjust the permanent magnet flux of the entire rotor assembly without excessively affecting the performance of the motor, alternatively, in one embodiment of this disclosure, the first magnetic component 2 includes a high coercivity magnet, the second magnetic component 32 includes a low coercivity magnet, and the adjustment coil 31 is wound around the low coercivity magnet.

[0066] Understandably, high-coercivity magnets are not easily affected by the magnetic field of the adjusting coil 31. Therefore, the adjusting coil 31 will not magnetize or demagnetize the high-coercivity magnets, and their magnetic field lines can maintain their original direction without interference. Conversely, low-coercivity magnets are easily affected by the magnetic field of the adjusting coil 31. The adjusting coil 31 can magnetize or demagnetize the low-coercivity magnets, causing a change in the direction of their magnetic field lines and thus altering the magnetic field. Therefore, the adjusting coil 31, in conjunction with the low-coercivity magnet, can produce a magnetic adjustment effect without interfering with the high-coercivity magnet. This allows for the adjustment of the permanent magnet flux of the entire rotor assembly without significantly affecting the motor's performance.

[0067] Furthermore, the magnetizing coil 31 is wound around a low-coercivity magnet, ensuring that the magnetizing and demagnetizing magnetic fields generated by the magnetizing coil 31 act entirely on the low-coercivity magnet, reducing magnetic leakage and improving magnetization and demagnetization efficiency. It is understood that the winding direction of the magnetizing coil 31 can be selected and arranged according to the extension direction of the magnetic conductor of the designed magnetic field, so that the direction of the magnetic field lines formed by the magnetizing coil 31 and the low-coercivity magnet can be the same as or opposite to the direction of the magnetic field lines of the high-coercivity magnet.

[0068] Optionally, in one embodiment of this disclosure, the magnetic circuit of the magnetic field of the first magnetic element 2 and the magnetic circuit of the magnetic field generated by the magnetic adjustment component 3 are connected in series and / or in parallel. This allows the magnetic adjustment component 3 to cooperate with the first magnetic element 2 to adjust the permanent magnet flux of the entire rotor assembly, adapting to the layout requirements of different motors. It should be noted that the magnetic circuit of the magnetic field of the first magnetic element 2 and the magnetic circuit of the magnetic field generated by the magnetic adjustment component 3 can be connected in series, in parallel, or a combination of both.

[0069] like Figure 9As shown, optionally, in one embodiment of this disclosure, in a third direction, at least a portion of the first magnetic element 2 and at least a portion of the second magnetic element 32 are arranged side-by-side, so that the magnetic circuit of the first magnetic element 2 is connected in series with the magnetic circuit of the magnetic field generated by the magnetizing component 3. The third direction is defined as the extension direction of the magnetic field lines of the first magnetic element 2. It can be understood that the extension direction of the magnetic field lines of the first magnetic element 2 is determined based on the position of the first magnetic element 2. When the position of the first magnetic element 2 is determined, the third direction is determined. Thus, in the third direction, at least a portion of the first magnetic element 2 and at least a portion of the second magnetic element 32 are arranged side-by-side, and the magnetic field lines of the first magnetic element 2 can pass through at least a portion of the second magnetic element 32. Therefore, the magnetic circuit of the first magnetic element 2 and the magnetic circuit of the magnetic field generated by the magnetizing component 3 are connected in series. It should be noted that if the position of the first magnetic element 2 is different, the orientation of the third direction will change, thus the third direction is determined according to the arrangement position of the first magnetic element 2.

[0070] like Figures 11-16 As shown, in the magnetized state, the magnetic field of the first magnetic component 2 is superimposed on the magnetic field generated by the magnetizing component 3; in the demagnetized state, a portion of the magnetic field of the first magnetic component 2 cancels out the magnetic field generated by the magnetizing component 3. It can be understood that since the magnetic circuits of the magnetic field of the first magnetic component 2 and the magnetic field generated by the magnetizing component 3 are in series, when the magnetic field lines of the first magnetic component 2 and the magnetic field generated by the magnetizing component 3 are in the same direction, their magnetic fields can be directly superimposed, increasing the magnetic flux. When the magnetic field lines of the first magnetic component 2 and the magnetic field generated by the magnetizing component 3 are in opposite directions, their magnetic field lines cancel each other out, thus a portion of the magnetic field of the first magnetic component 2 cancels out the magnetic field generated by the magnetizing component 3, thereby reducing the magnetic flux.

[0071] In some examples, the first magnetic element 2 extends along the circumferential direction of the rotor assembly, and the second magnetic element 32 extends along the circumferential direction of the rotor assembly. In the radial direction of the rotor assembly, at least a portion of the first magnetic element 2 is arranged side by side with at least a portion of the magnetic adjustment component 3, thereby connecting the magnetic circuit of the first magnetic element 2 and the magnetic circuit of the magnetic adjustment component 3 in series.

[0072] like Figure 17As shown, optionally, in one embodiment of this disclosure, in the fourth direction, at least a portion of the first magnetic element 2 and at least a portion of the second magnetic element 32 are arranged side-by-side, so that the magnetic circuit of the first magnetic element 2 is connected in parallel with the magnetic circuit of the magnetic field generated by the magnetizing component 3. The fourth direction is angled to the third direction, which is defined as the extension direction of the magnetic field lines of the first magnetic element 2. It is understood that the extension direction of the magnetic field lines of the first magnetic element 2 is determined based on the position of the first magnetic element 2. When the position of the first magnetic element 2 is determined, the third direction can be determined. Therefore, in the fourth direction, at least a portion of the first magnetic element 2 and at least a portion of the second magnetic element 32 are arranged side-by-side, and the magnetic field lines of the first magnetic element 2 and the magnetic field lines of the second magnetic element 32 are arranged in parallel. Thus, the magnetic circuit of the first magnetic element 2 and the magnetic circuit of the magnetic field generated by the magnetizing component 3 are connected in parallel.

[0073] like Figures 19-24 As shown, in the magnetized state, the magnetic field of the first magnetic element 2 is superimposed on the magnetic field generated by the magnetizing component 3. In the demagnetized state, a portion of the magnetic field lines of the first magnetic element 2 directly close with the magnetic field lines of the magnetic field generated by the magnetizing component 3, forming a closed magnetic circuit. It can be understood that since the magnetic circuits of the first magnetic element 2 and the magnetizing component 3 are in parallel, when the magnetic field lines of the first magnetic element 2 and the magnetizing component 3 are in the same direction, although they are arranged in parallel, they can still superimpose, increasing the magnetic flux. When the magnetic field lines of the first magnetic element 2 and the magnetic field lines of the magnetic field generated by the magnetic adjustment component 3 are in opposite directions, since the magnetic field lines of the first magnetic element 2 and the magnetic field lines of the magnetic field generated by the magnetic adjustment component 3 are arranged in parallel, the magnetic field lines of the magnetic field generated by the magnetic adjustment component 3 can divert part of the magnetic field lines of the first magnetic element 2, so that the magnetic field lines of the magnetic field generated by the magnetic adjustment component 3 and the magnetic field lines of the first magnetic element 2 are closed, forming a closed magnetic field inside the rotor core 1, which reduces the magnetic flux.

[0074] In some examples, the first magnetic element 2 extends radially along the rotor assembly, and the second magnetic element 32 extends circumferentially along the rotor assembly. In the circumferential direction of the rotor assembly, at least a portion of the first magnetic element 2 is arranged parallel to at least a portion of the magnetic adjustment component 3, thereby connecting the magnetic circuits of the first magnetic element 2 and the magnetic circuits of the magnetic adjustment component 3 in parallel. It is understood that one end of the first magnetic element 2 is close to one end of the magnetic adjustment component 3, while the other end of the first magnetic element 2 is far from the other end of the magnetic adjustment component 3.

[0075] like Figure 1As shown, optionally, in one embodiment of this disclosure, the first magnetic component 2 includes a first component 21 and a second component 22, which are spaced apart. The first component 21 and the second component 22 are arranged side-by-side in a third direction, thereby connecting the magnetic circuits of the first component 21 and the second component 22 in series.

[0076] In the third direction, at least a portion of the first component 21 is arranged side-by-side with at least a portion of the second magnetic component 32, such that the magnetic circuit of the first component 21 is connected in series with the magnetic circuit of the magnetic field generated by the magnetizing component 3. In the fourth direction, at least a portion of the second component 22 is arranged side-by-side with at least a portion of the second magnetic component 32, such that the magnetic circuit of the second component 22 is connected in parallel with the magnetic circuit of the magnetic field generated by the magnetizing component 3. The fourth direction is angled relative to the third direction, and the third direction is defined as the direction in which the magnetic field lines of the first magnetic component 2 extend.

[0077] It is understandable that the direction of the extension of the magnetic field lines of the first magnetic element 2 is determined based on the position of the first magnetic element 2. Thus, in the third direction, at least a portion of the first component 21 and at least a portion of the second magnetic element 32 are parallel, and the magnetic field lines of the first component 21 can pass through at least a portion of the second magnetic element 32. Thus, the magnetic circuit of the magnetic field of the first component 21 and the magnetic circuit of the magnetic field generated by the magnetizing component 3 are connected in series.

[0078] In the fourth direction, at least a portion of the second component 22 and at least a portion of the second magnetic component 32 are arranged side by side, and the magnetic field lines of the magnetic field of the second component 22 and the magnetic field lines of the magnetic field of the second magnetic component 32 are arranged side by side. Thus, the magnetic circuit of the magnetic field of the second component 22 and the magnetic circuit of the magnetic field generated by the magnetizing component 3 are connected in parallel. Therefore, the magnetic circuit of the magnetic field of the first magnetic component 2 and the magnetic circuit of the magnetic field of the magnetizing component 3 are connected in a series-parallel hybrid manner.

[0079] like Figures 3-8 As shown, in the magnetized state, the magnetic field of the first component 21 is superimposed on the magnetic field generated by the magnetizing component 3, and the magnetic field of the second component 22 is superimposed on the magnetic field generated by the magnetizing component 3. It can be understood that since the magnetic circuits of the first component 21 and the magnetizing component 3 are connected in series, when the magnetic field lines of the first component 21 and the magnetizing component 3 are in the same direction, their magnetic fields can be directly superimposed, increasing the magnetic flux. Furthermore, since the magnetic circuits of the second component 22 and the magnetizing component 3 are connected in parallel, when the magnetic field lines of the second component 22 and the magnetizing component 3 are in the same direction, although their magnetic field lines are arranged in parallel, they can still superimpose, increasing the magnetic flux.

[0080] In the demagnetized state, a portion of the magnetic field lines of the first component 21 cancel out the magnetic field lines of the magnetic field generated by the magnetizing component 3, and a portion of the magnetic field lines of the second component 22 directly close with the magnetic field lines of the magnetic field generated by the magnetizing component 3 to form a closed magnetic circuit.

[0081] Understandably, when the magnetic field lines of the first component 21 and the magnetic field lines generated by the adjusting component 3 are in opposite directions, they will cancel each other out. This results in a portion of the magnetic field of the first component 21 canceling out the magnetic field generated by the adjusting component 3, thus reducing the magnetic flux. Similarly, when the magnetic field lines of the second component 22 and the magnetic field generated by the adjusting component 3 are in opposite directions, since they are arranged side-by-side, the magnetic field lines generated by the adjusting component 3 can shun a portion of the magnetic field lines of the second component 22. This causes the magnetic field lines of the second component 22 and the second component 22 to close, forming a closed magnetic field inside the rotor core 1, which in turn reduces the magnetic flux.

[0082] In some examples, a first component 21 extends circumferentially along the rotor assembly, and a second magnetic component 32 extends circumferentially along the rotor assembly. In the radial direction of the rotor assembly, at least a portion of the first component 21 is arranged parallel to at least a portion of the magnetic adjustment component 3, thereby connecting the magnetic circuits of the first component 21 and the magnetic circuits of the magnetic adjustment component 3 in series. A second component 22 extends radially along the rotor assembly, and in the circumferential direction of the rotor assembly, at least a portion of the second component 22 is arranged parallel to at least a portion of the magnetic adjustment component 3, thereby connecting the magnetic circuits of the second component 22 and the magnetic circuits of the magnetic adjustment component 3 in parallel. It is understood that one end of the second component 22 is close to one end of the magnetic adjustment component 3, and the other end of the second component 22 is far from the other end of the magnetic adjustment component 3.

[0083] Optionally, in one embodiment of this disclosure, the number of first magnetic elements 2 is multiple, forming multiple sets of first magnetic element groups 23. The multiple sets of first magnetic element groups 23 are spaced apart along the circumferential direction of the rotor assembly. The magnetic circuit of each set of first magnetic element groups 23 is closed to form a ring magnetic circuit. A magnetic adjustment component 3 is provided between each two adjacent sets of first magnetic element groups 23, and multiple magnetic adjustment components 3 are spaced apart.

[0084] In this system, the magnetic circuit of the first magnetic element 2 in each group of first magnetic element groups 23 is closed to form a magnetic field. Multiple groups of first magnetic element groups 23 are distributed at intervals around the axis of the rotor assembly. A magnetic adjustment component 3 is provided between each pair of adjacent groups of first magnetic element groups 23, resulting in a plurality of magnetic adjustment components 3. Each magnetic adjustment component 3 can cooperate with two adjacent groups of first magnetic element groups 23 to adjust the magnetic flux. That is, the magnetic field of each magnetic adjustment component 3 can be superimposed with the magnetic fields of two adjacent groups of first magnetic element groups 23, or the magnetic field of each magnetic adjustment component 3 can cancel out a portion of the magnetic fields of two adjacent groups of first magnetic element groups 23, or shunt and close a portion of the magnetic fields of two adjacent groups of first magnetic element groups 23.

[0085] In the circumferential direction of the rotor assembly, each group of first magnetic components 23 is spaced apart from the adjacent magnetic adjustment component 3, and the two are not connected.

[0086] Alternatively, in one embodiment of this disclosure, the filler material includes plastic. The plastic may be a thermoplastic, which can be injected and cured using an injection molding process.

[0087] The first magnetic component 2 is fixedly connected to the rotor core 1 by injection molding of plastic. The magnetic adjustment component 3 is fixedly connected to the rotor core 1 by injection molding of plastic.

[0088] Understandably, after the first magnetic component 2 is inserted into the first receiving groove 11, plastic raw material can be injected and cured using an injection molding process to form a solid plastic, thus fixing the first magnetic component 2 in the first receiving groove 11. Similarly, after the magnetizing component 3 is inserted into the second receiving groove 12, plastic raw material can be injected and cured using an injection molding process to form a solid plastic, thus fixing the magnetizing component 3 in the second receiving groove 12.

[0089] Alternatively, in another embodiment of this disclosure, the filling material includes an adhesive material or a potting material, which is filled into the first receiving groove 11 and the second receiving groove 12. As the adhesive material or potting material cures, the first magnetic component 2 is fixed in the first receiving groove 11 and the magnetic adjustment component 3 is fixed in the second receiving groove 12.

[0090] A second aspect of this disclosure also provides an electric motor including the rotor assembly described above.

[0091] A third aspect of this disclosure also provides a vehicle that includes the rotor assembly described above, or that includes the electric motor described above.

[0092] The preferred embodiments of this disclosure have been described in detail above with reference to the accompanying drawings. However, this disclosure is not limited to the specific details of the above embodiments. Within the scope of the technical concept of this disclosure, various simple modifications can be made to the technical solutions of this disclosure, and these simple modifications all fall within the protection scope of this disclosure.

[0093] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, this disclosure will not describe the various possible combinations separately.

[0094] Furthermore, various different embodiments of this disclosure can be combined in any way, as long as they do not violate the spirit of this disclosure, they should also be regarded as the content disclosed in this disclosure.

Claims

1. A rotor assembly, characterized in that, include: The rotor core is provided with a first receiving groove and a second receiving groove; A first magnetic component is disposed in a first receiving groove filled with a filling material, and the first magnetic component is fixedly connected to the rotor core through the filling material. A magnetic adjustment component is disposed in the second accommodating groove, which is filled with the filling material. The magnetic adjustment component is fixedly connected to the rotor core through the filling material. The direction of the magnetic field lines generated by the magnetic adjustment component is adjustable. The cooperation between the magnetic adjustment component and the first magnetic component can increase or decrease the total magnetic flux of the rotor assembly.

2. The rotor assembly according to claim 1, characterized in that, The magnetizing component includes a magnetizing coil and a second magnetic element. The magnetizing coil is configured to receive a pulse current to magnetize or demagnetize the second magnetic element. The magnetizing component includes a magnetizing state and a demagnetizing state. In the magnetizing state, the current in the magnetizing coil is transmitted along a first direction, and the direction of the magnetic field lines of the magnetic field generated by the magnetizing component is the same as the direction of the magnetic field lines of the magnetic field of the first magnetic component. In the demagnetized state, the current in the magnetizing coil is transmitted along the second direction, and the direction of the magnetic field lines of the magnetic field generated by the magnetizing component is opposite to the direction of the magnetic field lines of the magnetic field of the first magnetic component. The first direction and the second direction are opposite.

3. The rotor assembly according to claim 2, characterized in that, The first magnetic component includes a high coercivity magnet, the second magnetic component includes a low coercivity magnet, and the magnetizing coil is wound around the low coercivity magnet.

4. The rotor assembly according to claim 2, characterized in that, The magnetic circuit of the magnetic field of the first magnetic component and the magnetic circuit of the magnetic field generated by the magnetic adjustment component are connected in series and / or in parallel.

5. The rotor assembly according to claim 4, characterized in that, In the third direction, at least a portion of the first magnetic element and at least a portion of the second magnetic element are arranged side by side, such that the magnetic circuit of the first magnetic element is connected in series with the magnetic circuit of the magnetic field generated by the magnetizing component. In the magnetized state, the magnetic field of the first magnetic element is superimposed on the magnetic field generated by the magnetizing component; in the demagnetized state, a portion of the magnetic field of the first magnetic element cancels out the magnetic field generated by the magnetizing component. The third direction is defined as the extension direction of the magnetic field lines of the magnetic field of the first magnetic element.

6. The rotor assembly according to claim 4, characterized in that, In the fourth direction, at least a portion of the first magnetic element and at least a portion of the second magnetic element are arranged side by side, such that the magnetic circuit of the first magnetic element is connected in parallel with the magnetic circuit of the magnetic field generated by the magnetizing component. In the magnetized state, the magnetic field of the first magnetic element is superimposed on the magnetic field generated by the magnetizing component. In the demagnetized state, a portion of the magnetic field lines of the first magnetic element directly close with the magnetic field lines of the magnetic field generated by the magnetizing component to form a closed magnetic circuit. The fourth direction is set at an angle to the third direction, and the third direction is set as the extension direction of the magnetic field lines of the magnetic field of the first magnetic element.

7. The rotor assembly according to claim 4, characterized in that, The first magnetic component includes a first component and a second component, which are spaced apart. In a third direction, at least a portion of the first component is arranged side by side with at least a portion of the second magnetic component, such that the magnetic circuit of the first component is connected in series with the magnetic circuit of the magnetic field generated by the magnetizing component; In the fourth direction, at least a portion of the second member is arranged side by side with at least a portion of the second magnetic element, such that the magnetic circuit of the second member is connected in parallel with the magnetic circuit of the magnetic field generated by the magnetizing component; In the magnetized state, the magnetic field of the first component is superimposed with the magnetic field generated by the magnetizing component, and the magnetic field of the second component is superimposed with the magnetic field generated by the magnetizing component. In the demagnetized state, a portion of the magnetic field lines of the first component cancel out the magnetic field lines of the magnetic field generated by the magnetizing component, and a portion of the magnetic field lines of the second component directly close with the magnetic field lines of the magnetic field generated by the magnetizing component to form a magnetic circuit with closed magnetic flux. The fourth direction is set at an angle to the third direction, and the third direction is set as the extension direction of the magnetic field lines of the magnetic field of the first magnetic element.

8. The rotor assembly according to claim 1, characterized in that, The number of the first magnetic components is multiple, forming multiple groups of first magnetic component groups. The multiple groups of first magnetic component groups are spaced apart along the circumferential direction of the rotor assembly. The magnetic circuit of each group of first magnetic component groups is closed to form a ring magnetic circuit. The magnetic adjustment component is provided between each two adjacent groups of first magnetic component groups, and the multiple magnetic adjustment components are spaced apart.

9. The rotor assembly according to any one of claims 1-8, characterized in that, The filler material includes plastic; The first magnetic component is fixedly connected to the rotor core by injection molding of the plastic. The magnetic adjustment component is fixedly connected to the rotor core by injection molding.

10. An electric motor, characterized in that, Includes the rotor assembly as described in any one of claims 1-9.

11. A vehicle, characterized in that, It includes the rotor assembly as described in any one of claims 1-9, or the motor as described in claim 10.

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