A dual-stator dual-rotor permanent magnet motor

Abstract

The utility model relates to a permanent magnet motor technical field, concretely relates to a double stator double rotor permanent magnet motor, including frame, pivot, stator group, rotor group, front end cover and back end cover, the stator group includes: two stator cores, along the axial of frame and side by side in the frame, two stator windings are arranged in two stator cores respectively, the rotor group includes: two rotor cores, along the axial of frame and side by side in the pivot, two rotor windings are arranged in two rotor cores respectively, two bearings are arranged in the pivot two ends along the axial of frame respectively, along the axial of frame, the front end cover with back end cover is arranged in the frame two ends respectively, the application improves the ability that permanent magnet motor is in response to the risk of failure, guarantees the long -term stable operation of permanent magnet motor.

Description

Technical Field

[0001] This utility model relates to the field of permanent magnet motor technology, specifically to a dual-stator dual-rotor permanent magnet motor. Background Technology

[0002] In fields such as new energy vehicles, industrial automation, and aerospace, permanent magnet motors are widely used in power drive systems due to their advantages such as high power density, high efficiency, and high response speed. However, as these fields increasingly demand higher stability and reliability in equipment operation, the reliability of permanent magnet motors has become a key factor restricting their further development and application.

[0003] Existing permanent magnet motors generally adopt a single stator and single rotor structure design. While this structure has the advantages of simple design and convenient manufacturing, it has significant reliability shortcomings. As the core component for energy conversion in the motor, the single stator or single rotor is susceptible to failure. If a fault occurs, such as a short circuit or open circuit in the stator winding, or demagnetization or mechanical damage to the rotor permanent magnet, the motor will directly fail to operate normally, affecting the operational stability and reliability of the power drive system.

[0004] Therefore, how to overcome the shortcomings of the existing technology mentioned above has become the subject of this utility model. Utility Model Content

[0005] The purpose of this invention is to provide a dual-stator dual-rotor permanent magnet motor.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0007] A dual-stator dual-rotor permanent magnet motor includes a frame, a shaft, a stator assembly, a rotor assembly, a front end cover, and a rear end cover;

[0008] The stator assembly includes:

[0009] Two stator cores are arranged side by side on the machine base along the axial direction of the machine base;

[0010] Two stator windings are respectively located on the two stator cores;

[0011] The rotor assembly includes:

[0012] Two rotor cores are arranged side by side on the rotating shaft along the axial direction of the machine base;

[0013] Two rotor windings are respectively located on the two rotor cores;

[0014] Two bearings are respectively disposed at both ends of the rotating shaft along the axial direction of the machine base;

[0015] Along the axial direction of the machine base, the front end cover and the rear end cover are respectively disposed at both ends of the machine base.

[0016] It should be emphasized that this application does not change the basic working principle of the permanent magnet motor.

[0017] In the above scheme, the stator assembly includes two stator cores and two stator windings housed within a single frame. This can be considered as the stator assembly comprising two stators (structures), i.e., a dual-stator structure. When either stator structure fails, the existence of the other ensures the continued operation of the stator assembly, improving the permanent magnet motor's ability to cope with fault risks and guaranteeing its long-term stable operation. Furthermore, the two stator structures share a single frame, avoiding a significant increase in structural cost by adding an extra stator structure.

[0018] The rotor assembly comprises two rotor cores, two rotor windings, and two bearings, and can be considered as a dual-rotor structure consisting of two rotors. When either rotor structure fails, the presence of the other ensures continued operation of the rotor assembly, further enhancing the permanent magnet motor's ability to handle fault risks and guaranteeing its long-term stable operation. Furthermore, the two rotor structures share a single shaft and two bearings, avoiding a significant increase in structural cost by adding another rotor structure.

[0019] For dual-stator, dual-rotor permanent magnet motors, the synergistic effect of the dual stators and dual rotors significantly improves torque density in the low-speed range and achieves high-speed constant power output, making them suitable for various operating conditions such as hybrid vehicles. This structure achieves an effect similar to dual-motor collaborative operation, while reducing current and inverter capacity during single-machine operation, thus lowering system costs and improving operational reliability through redundant design.

[0020] Both the two stator structures and the two rotor structures are arranged side by side along the axial direction of the frame, reducing the radial dimension of the motor and achieving a slender design.

[0021] The front and rear covers are standard features and will not be described in detail here. Similarly, the purpose of the bearings and other structures remains unchanged and will not be described in detail here.

[0022] A further technical solution also includes two junction boxes, which are respectively located at both ends of the circumferential side of the base along the axial direction of the base.

[0023] Junction boxes are used to work with stator leads in the stator structure to achieve electrical connection between the internal windings of the motor and the external power supply or control system. This is a conventional use and will not be explained in detail here.

[0024] The two junction boxes correspond to the dual-stator structure. The two junction boxes are respectively located at both ends of the circumferential side of the frame, so that the two junction boxes are close to the two stator structures, which facilitates the matching with the stator leads.

[0025] The two junction boxes are respectively located at both ends of the circumferential side of the base, which avoids increasing the axial space requirement of the permanent magnet motor by adding a junction box, making the permanent magnet motor in this application suitable for installation environments with limited axial space.

[0026] A further technical solution is that the length direction of the junction box is parallel to the axial direction of the base. This arrangement avoids significantly increasing the radial space requirement of the permanent magnet motor, ensuring the applicability of the permanent magnet motor, and improving the radial space utilization rate of the permanent magnet motor.

[0027] A further technical solution involves placing the vertical projection of the junction box within the vertical projection of the base in the radial direction. This arrangement ensures that the junction box does not protrude from the base in the axial direction, further reducing the axial space requirement of the permanent magnet motor and making the permanent magnet motor of this application suitable for installation environments with limited axial space.

[0028] A further technical solution also includes two rotary transformers fixedly mounted on the rear end cover, with the two rotary transformers arranged side by side along the axial direction of the base.

[0029] Rotary transformers correspond to rotor structures, and this is a conventional application, so it will not be discussed further here.

[0030] Due to the configuration of two rotor structures, two rotary transformers are also configured, and the two rotary transformers are arranged side by side along the axial direction of the frame to ensure the reliability of the output rotor structure speed and other information.

[0031] In a further technical solution, the base is configured as an aluminum alloy base;

[0032] The front cover is made of aluminum alloy.

[0033] The rear end cover is made of aluminum alloy.

[0034] The aluminum alloy base, aluminum alloy front cover, and aluminum alloy rear cover ensure the operational stability of the permanent magnet motor.

[0035] Taking aluminum alloy frame as an example: aluminum alloy frame is lighter than traditional cast iron material, which can significantly reduce the overall weight of the motor, while maintaining sufficient mechanical strength to support core components such as stator and rotor, and reduce the impact of vibration on the operating stability of permanent magnet motor.

[0036] The terms "first," "second," etc., used in this article do not specifically refer to order or sequence, nor are they intended to limit this case; they are merely used to distinguish components or operations described using the same technical terms.

[0037] The terms "connection" or "positioning" as used in this article can refer to two or more components or devices making direct physical contact with each other, or making indirect physical contact with each other, or to two or more components or devices operating or moving with each other.

[0038] The terms “include,” “including,” and “have” used in this article are all open-ended, meaning they include but are not limited to.

[0039] Unless otherwise specified, the terms used herein generally have their ordinary meaning in the context of the art, the subject matter, and the specific context. Certain terms used to describe this case will be discussed below or elsewhere in this specification to provide additional guidance to those skilled in the art in describing the case.

[0040] The terms “front,” “back,” “up,” “down,” “left,” and “right” used in this article are directional terms. In this case, they are only used to describe the positional relationship between the structures and are not intended to limit the specific direction of the protection scheme or its actual implementation.

[0041] The working principle and advantages of this utility model are as follows:

[0042] The stator assembly comprises two stator cores and two stator windings housed within a single frame. It can be considered as a dual-stator structure, consisting of two stators. When either stator structure fails, the presence of the other ensures continued operation of the entire stator assembly, enhancing the permanent magnet motor's ability to handle faults and guaranteeing its long-term stable operation. Furthermore, the two stator structures share a single frame, avoiding a significant increase in structural costs by adding an extra stator structure.

[0043] The rotor assembly comprises two rotor cores, two rotor windings, and two bearings integrated on a single shaft. It can be considered as a rotor assembly consisting of two rotors (structures), i.e., a dual-rotor structure. When either rotor structure fails, the presence of the other ensures continued operation of the rotor assembly, further enhancing the permanent magnet motor's ability to cope with fault risks and guaranteeing its long-term stable operation. Furthermore, the two rotor structures share a single shaft and two bearings, avoiding a significant increase in structural cost by adding another rotor structure.

[0044] For dual-stator, dual-rotor permanent magnet motors, the synergistic effect of the dual stators and dual rotors significantly improves torque density in the low-speed range and achieves high-speed constant power output, making them suitable for various operating conditions such as hybrid vehicles. This structure achieves an effect similar to dual-motor collaborative operation, reducing current and inverter capacity during single-machine operation. This reduces system costs and improves operational reliability through redundant design, ultimately ensuring the operational stability and reliability of the power drive system.

[0045] Both the two stator structures and the two rotor structures are arranged side by side along the axial direction of the frame, reducing the radial dimension of the motor and achieving a slender design. Attached Figure Description

[0046] Figure 1 This is a schematic diagram of the structure of a dual-stator dual-rotor permanent magnet motor according to an embodiment of the present invention (part of the structure is shown in cross-section).

[0047] In the above attached diagram: 1. Stator assembly; 11. Frame; 12. Stator core; 13. Stator winding; 2. Rotor assembly; 21. Shaft; 22. Rotor core; 23. Rotor winding; 24. Bearing; 3. Front end cover; 4. Rear end cover; 5. Junction box; 6. Rotary transformer. Detailed Implementation

[0048] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0049] Example: The present invention will be clearly described below with illustrations and detailed description. Any person skilled in the art who understands the examples of the present invention can make changes and modifications based on the technology taught in the present invention without departing from the spirit and scope of the present invention.

[0050] The terminology used herein is for the purpose of describing specific embodiments only and is not intended to limit the scope of this work. Singular forms such as “a,” “this,” “this,” “the,” and “the” as used herein also include plural forms.

[0051] See Figure 1 A dual-stator dual-rotor permanent magnet motor includes a frame 11, a rotating shaft 21, a stator assembly 1, a rotor assembly 2, a front end cover 3, and a rear end cover 4.

[0052] The stator assembly 1 includes:

[0053] Two stator cores 12 are arranged side by side on the base 11 along the axial direction of the base 11;

[0054] Two stator windings 13 are respectively disposed on the two stator cores 12;

[0055] The rotor assembly 2 includes:

[0056] Two rotor cores 22 are arranged side by side on the rotating shaft 21 along the axial direction of the base 11;

[0057] Two rotor windings 23 are respectively disposed on the two rotor cores 22;

[0058] Two bearings 24 are respectively disposed at both ends of the rotating shaft 21 along the axial direction of the base 11;

[0059] Along the axial direction of the base 11, the front end cover 3 and the rear end cover 4 are respectively disposed at both ends of the base 11.

[0060] It should be emphasized that this application does not change the basic working principle of the permanent magnet motor.

[0061] Stator assembly 1 includes two stator cores 12 and two stator windings 13 housed within a single frame 11. It can be considered as stator assembly 1 comprising two stators (structures), i.e., stator assembly 1 is a dual-stator structure. When either stator structure fails, the existence of the other stator structure ensures continued operation of stator assembly 1, improving the permanent magnet motor's ability to cope with fault risks and guaranteeing long-term stable operation. Furthermore, the two stator structures share a single frame 11, avoiding a significant increase in structural cost by adding an extra stator structure.

[0062] Rotor assembly 2 includes two rotor cores 22, two rotor windings 23, and two bearings 24. It can be considered as having two rotors (structures), i.e., rotor assembly 2 is a dual-rotor structure. When any rotor structure fails, the existence of the other rotor structure ensures that rotor assembly 2 continues to operate, further improving the permanent magnet motor's ability to cope with fault risks and further guaranteeing the long-term stable operation of the permanent magnet motor. Furthermore, the two rotor structures share a single shaft 21 and two bearings 24, avoiding a significant increase in structural cost by adding another rotor structure. The assembly of the shaft 21 and rotor cores 22 is not restricted and can adopt existing configurations according to actual needs. The assembly of the shaft 21 and the frame 11 follows existing specifications.

[0063] For dual-stator, dual-rotor permanent magnet motors, the synergistic effect of the dual stators and dual rotors significantly improves torque density in the low-speed range and achieves high-speed constant power output, making them suitable for various operating conditions such as hybrid vehicles. This structure achieves an effect similar to dual-motor collaborative operation, while reducing current and inverter capacity during single-machine operation, thus lowering system costs and improving operational reliability through redundant design.

[0064] Both the two stator structures and the two rotor structures are arranged side by side along the axial direction of the frame 11, which reduces the radial dimension of the motor and achieves a slender design.

[0065] The front cover 3 and the rear cover 4 are standard configurations and will not be described in detail here. Similarly, the purpose of the bearing 24 and other structures remains unchanged and will not be described in detail here.

[0066] In some embodiments, the outer diameter of the stator lamination in the stator structure corresponds to the H225 center height platform.

[0067] In some embodiments, the stator winding 13 ends are potted, which improves heat dissipation and increases the motor power density.

[0068] In some embodiments, the base 11 is provided with double stops.

[0069] In some embodiments, the output shaft of the permanent magnet motor is an external spline.

[0070] In this embodiment, two junction boxes 5 are also included, which are disposed at both ends of the circumferential side of the base 11 along the axial direction of the base 11.

[0071] Junction box 5 is used to cooperate with the stator leads in the stator structure to realize the electrical connection between the internal windings of the motor and the external power supply or control system. This is a conventional use and will not be described in detail here.

[0072] The two junction boxes 5 correspond to the double stator structure. The two junction boxes 5 are respectively located at both ends of the circumferential side of the frame 11, so that the two junction boxes 5 are close to the two stator structures, which facilitates their cooperation with the stator leads.

[0073] Two junction boxes 5 are respectively located at both ends of the circumferential side of the base 11, avoiding the increase in the axial space requirement of the permanent magnet motor by adding a junction box 5, so that the permanent magnet motor in this application is suitable for installation environments with limited axial space.

[0074] In this embodiment, the length direction of the junction box 5 is parallel to the axial direction of the base 11. This arrangement avoids significantly increasing the radial space requirement of the permanent magnet motor, ensuring the applicability of the permanent magnet motor, and improving the radial space utilization rate of the permanent magnet motor.

[0075] In this embodiment, the vertical projection of the junction box 5 is located within the vertical projection of the base 11 in the radial direction. This arrangement ensures that the junction box 5 does not protrude from the base 11 in the axial direction, further guaranteeing that the permanent magnet motor has a low requirement for axial space, making the permanent magnet motor in this application suitable for installation environments with limited axial space.

[0076] In this embodiment, two rotary transformers 6 are fixedly mounted on the rear end cover 4, and the two rotary transformers 6 are arranged side by side along the axial direction of the base 11.

[0077] The rotary transformer 6 corresponds to the rotor structure. This is a conventional application and will not be described in detail here.

[0078] Due to the configuration of two rotor structures, two rotary transformers 6 are also configured, and the two rotary transformers 6 are arranged side by side along the axial direction of the base 11 to ensure the reliability of the output rotor structure speed and other information.

[0079] In this embodiment, the base 11 is configured as an aluminum alloy base;

[0080] The front cover 3 is made of aluminum alloy.

[0081] The rear end cover 4 is made of aluminum alloy.

[0082] The aluminum alloy base, aluminum alloy front cover, and aluminum alloy rear cover ensure the operational stability of the permanent magnet motor.

[0083] Taking aluminum alloy frame as an example: aluminum alloy frame is lighter than traditional cast iron material, which can significantly reduce the overall weight of the motor, while maintaining sufficient mechanical strength to support core components such as stator and rotor, and reduce the impact of vibration on the operating stability of permanent magnet motor.

[0084] It should be noted that some descriptions are not emphasized in this application, such as the spacing between the stator structure and the rotor structure, and the coaxial arrangement of the rotary transformer 6 and the rotating shaft 21. These are conventional existing configurations and are well known to those skilled in the art.

[0085] The above embodiments are only for illustrating the technical concept and features of this utility model, and are intended to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They should not be construed as limiting the scope of protection of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be included within the scope of protection of this utility model.

Claims

1. A dual stator dual rotor permanent magnet electric machine characterized by: It includes a base (11), a rotating shaft (21), a stator assembly (1), a rotor assembly (2), a front end cover (3), and a rear end cover (4). The stator assembly (1) includes: Two stator cores (12) are arranged side by side on the base (11) along the axial direction of the base (11). Two stator windings (13) are respectively provided on the two stator cores (12); The rotor assembly (2) includes: Two rotor cores (22) are arranged side by side on the rotating shaft (21) along the axial direction of the base (11). Two rotor windings (23) are respectively provided on the two rotor cores (22); Two bearings (24) are respectively disposed at both ends of the rotating shaft (21) along the axial direction of the base (11); Along the axial direction of the base (11), the front end cover (3) and the rear end cover (4) are respectively located at both ends of the base (11).

2. A dual stator dual rotor permanent magnet electric machine according to claim 1, characterized in that: It also includes two junction boxes (5), which are located at both ends of the circumferential side of the base (11) along the axial direction of the base (11).

3. A dual-stator, dual-rotor permanent magnet motor according to claim 2, characterized in that: The length direction of the junction box (5) is parallel to the axial direction of the base (11).

4. A dual-stator, dual-rotor permanent magnet motor according to claim 3, characterized in that: In the radial direction of the base (11), the vertical projection of the junction box (5) lies within the vertical projection of the base (11).

5. A dual-stator, dual-rotor permanent magnet motor according to claim 1, characterized in that: It also includes two rotary transformers (6) fixedly mounted on the rear end cover (4), with the two rotary transformers (6) arranged side by side along the axial direction of the base (11).

6. A dual-stator, dual-rotor permanent magnet motor according to claim 1, characterized in that: The base (11) is an aluminum alloy base; The front cover (3) is made of aluminum alloy; The rear end cover (4) is made of aluminum alloy.

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