Electric machine structure and electric drive device

Abstract

Embodiments of the present application provide a motor structure and an electric drive device, wherein the motor structure comprises: a stator structure comprising a first stator and a second stator arranged at intervals; a rotor structure coaxially arranged with the stator structure, the rotor structure being arranged between the first stator and the second stator; a stator winding arranged on the first stator and / or the second stator; wherein the side of the first stator facing the rotor structure is provided with a plurality of first stator teeth, the side of the second stator facing the rotor structure is provided with a plurality of second stator teeth, the shape of a first stator slot formed between at least two adjacent first stator teeth is different, and / or the shape of a second stator slot formed between at least two adjacent second stator teeth is different. In the technical solution of the present application, by arranging the first stator slot or the second stator slot with different shapes, the cogging torque and torque ripple of the motor can be effectively reduced.

Description

Technical Field

[0001] This invention relates to the field of motor technology, and more specifically, to a motor structure and an electric drive device. Background Technology

[0002] As technology continues to develop, the form of motors also changes. Currently, dual-stator permanent magnet motors are gradually entering the selection range of designers due to their high power density. In order to further improve the power density of the motor, large slots and broken magnetic bridges are often used in the design. However, when the above-mentioned design is used in the existing technology, the cogging torque of the motor is large and the torque ripple is large. Summary of the Invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art or related art.

[0004] In view of this, an embodiment of the first aspect of the present invention provides a motor structure.

[0005] An embodiment of the second aspect of the present invention provides an electrically driven device.

[0006] To achieve the above objectives, an embodiment of the first aspect of the present invention provides a motor structure, comprising: a stator structure including a first stator and a second stator spaced apart; a rotor structure coaxially disposed with the stator structure and located between the first stator and the second stator; and a stator winding disposed on the first stator and / or the second stator; wherein the first stator has a plurality of first stator teeth on the side facing the rotor structure, and the second stator has a plurality of second stator teeth on the side facing the rotor structure, and the shape of the first stator slot formed between at least two adjacent first stator teeth is different, and / or the shape of the second stator slot formed between at least two adjacent second stator teeth is different.

[0007] The motor structure provided by the first aspect of the present invention mainly includes a stator structure and a rotor structure, which are coaxially arranged so that when the stator structure is energized, they generate mutual magnetic fields, thereby driving the rotor structure to rotate. In this application, the stator structure specifically includes two stators, namely a first stator and a second stator spaced apart. By setting the rotor structure between the first stator and the second stator, after windings are formed on at least one of the first stator and the second stator, the magnetic field applied to the rotor structure changes according to the energization condition, thereby driving the rotor structure to rotate continuously.

[0008] It should be emphasized that in this application, the first stator is provided with a plurality of first stator teeth, and a first stator slot is formed between the plurality of stator teeth. By restricting the shape of the first stator slot, at least two first stator slots are restricted to have different shapes, so that the distribution of the entire first stator teeth is not completely uniform, thereby effectively reducing the cogging torque and torque pulsation of the motor when the motor structure is running.

[0009] Similarly, for the second stator, multiple second stator teeth are provided on the second stator, and second stator slots are formed between the multiple stator teeth. By restricting the shape of the second stator slots, at least two second stator slots are restricted to have different shapes, so that the distribution of the entire second stator teeth is not completely uniform. Thus, when the motor structure is running, under the combined action of the first stator and the second stator, the cogging torque and torque pulsation of the motor can be effectively reduced.

[0010] Furthermore, a winding slot is formed between two adjacent stator teeth so that the stator winding can be wound on the winding slot, which can generate a magnetic field on the rotor to achieve the stator function.

[0011] In addition, the specific motor structure can be a bidirectional motor or a unidirectional motor that rotates in a specified direction.

[0012] It should be added that by utilizing the first and second stators, leakage flux can be reduced and magnetic flux linkage can be increased, thereby improving the motor's output torque and power density.

[0013] In addition, the motor structure in the above-mentioned solution provided by the present invention may also have the following additional technical features:

[0014] The above technical solution includes: on the end face projection surface of the stator structure, the circumferential axis of symmetry of at least one first stator slot coincides with the circumferential axis of symmetry of the second stator tooth; or on the end face projection surface of the stator structure, the circumferential axis of symmetry of at least one second stator slot coincides with the circumferential axis of symmetry of the first stator tooth.

[0015] In this technical solution, by restricting the circumferential positions of the first stator tooth and the second stator slot, that is, by limiting at least one circumferential axis of symmetry of the first stator slot and the circumferential axis of symmetry of the second stator tooth to coincide on the projection of the stator structure end face, a positive relative position relationship can be formed. Based on this, it is convenient to divide the shape of the first stator tooth to achieve a non-uniform distribution of stator teeth, thereby optimizing the cogging torque and torque pulsation of the motor structure as a whole during operation.

[0016] Similarly, the circumferential positions of the second stator tooth and the first stator slot can be restricted, that is, at least one circumferential axis of symmetry of the second stator slot and the circumferential axis of symmetry of the first stator tooth are required to coincide on the projection of the end face of the stator structure, so as to form a positive relative positional relationship. Based on this, it is convenient to divide the shape of the second stator tooth to achieve a non-uniform distribution of stator teeth, thereby optimizing the cogging torque and torque pulsation of the motor structure as a whole during operation.

[0017] In the above technical solution, on the end face projection surface of the stator structure, the circumferential axis of symmetry of at least one first stator slot does not coincide with the circumferential axis of symmetry of the second stator tooth; or on the end face projection surface of the stator structure, the circumferential axis of symmetry of at least one second stator slot does not coincide with the circumferential axis of symmetry of the first stator tooth.

[0018] In this technical solution, by restricting the circumferential positions of the first stator tooth and the second stator slot, that is, by limiting at least one circumferential axis of symmetry of the first stator slot and the circumferential axis of symmetry of the second stator tooth to not coincide on the projection of the end face of the stator structure, a misaligned relative positional relationship can be formed, thereby optimizing the cogging torque and torque pulsation of the motor structure as a whole during operation.

[0019] Similarly, the circumferential positions of the second stator tooth and the first stator slot can be restricted, that is, at least one circumferential axis of symmetry of the second stator slot and the circumferential axis of symmetry of the first stator tooth are not coincident on the projection of the end face of the stator structure, thereby forming a misaligned relative positional relationship, and thus optimizing the cogging torque and torque pulsation of the motor structure as a whole during operation.

[0020] In the above technical solution, the included angle between the first stator slot and the second stator tooth whose circumferential symmetry axes do not coincide satisfies (0, 60 / Z), where Z is the number of the second stator teeth; or the included angle between the second stator slot and the first stator tooth whose circumferential symmetry axes do not coincide satisfies (0, 60 / Z), where Z is the number of the first stator teeth.

[0021] In this technical solution, when there is a certain angle between the projections of the first stator slot and the second stator tooth, the angle needs to be limited to less than 60 / Z, where Z is the specific number of the second stator teeth. This allows the second stator teeth to be set on the basis of the second stator, ensuring that the angle between the first stator slot and the second stator tooth is as small as possible, while still requiring a certain degree of misalignment. Similarly, for the second stator slot and the first stator tooth, when there is an angle between them, the specific angle should be greater than 0 and less than 60 / Z, where Z is the specific number of the first stator teeth, in order to effectively reduce cogging torque and torque pulsation in the subsequent process.

[0022] In the above technical solution, the number of the first stator teeth is the same as the number of the second stator teeth.

[0023] In this technical solution, by limiting the number of the first stator teeth and the second stator teeth to be the same, it is easier to increase the effective magnetic flux and improve the torque density.

[0024] In the above technical solution, when at least two first stator slots have different shapes, the circumferential angle between any two adjacent first stator teeth satisfies (240 / Z, 480 / Z), where Z is the number of first stator teeth; when at least two second stator slots have different shapes, the circumferential angle between any two adjacent second stator teeth satisfies (240 / Z, 480 / Z), where Z is the number of second stator teeth.

[0025] In this technical solution, when multiple first stator slots on the first stator have different shapes, meaning the distribution or shape of the first stator teeth is not entirely consistent, the spacing angle of the first stator teeth can be limited. Specifically, the angle between two adjacent first stator teeth must be greater than 240° / Z and less than 480° / Z, where Z is the specific number of first stator teeth. This satisfies the normal operating performance of the motor and ensures the normal operation of the motor structure. Similarly, when at least two shapes exist for the second stator slots on the second stator, and the distribution or shape of the second stator teeth is not entirely consistent, the spacing angle of the second stator teeth can be limited. Specifically, the angle between two adjacent second stator teeth must be greater than 240° / Z and less than 480° / Z, where Z is the specific number of second stator teeth. This satisfies the normal operating performance of the motor and ensures the normal operation of the motor structure.

[0026] In the above technical solution, the rotor structure specifically includes: a rotor core, the rotor core having multiple permanent magnet slots circumferentially arranged; and permanent magnets disposed within the permanent magnet slots.

[0027] In this technical solution, the rotor structure mainly includes a rotor core and permanent magnets. The rotor core is provided with multiple permanent magnet slots, and each permanent magnet slot is provided with a permanent magnet, which makes it easy to install and position the permanent magnets.

[0028] The permanent magnet slots are arranged circumferentially along the rotor core to generate a multi-pole magnetic field in the circumferential direction.

[0029] Furthermore, the permanent magnet slots are arranged uniformly around the axis of the rotor core.

[0030] In the above technical solution, the polarities of multiple permanent magnets are alternately arranged along the circumference of the rotor core.

[0031] In this technical solution, the polarities of multiple permanent magnets are alternately arranged along the circumference of the rotor core to generate a multi-pole magnetic field along the circumference, thereby enabling the normal operation of the motor structure.

[0032] In the above technical solution, the first stator and the second stator are spaced apart along the axial direction of the stator structure, and the rotor structure is located between the first stator and the second stator along the axial direction of the stator structure.

[0033] In this technical solution, the first stator and the second stator are mainly arranged along the axial direction of the stator structure to form an axial magnetic flux structure. At this time, the rotor structure is located between the first stator and the second stator. That is, along the axial direction of the stator structure, the first stator, the rotor structure and the second stator are respectively from one end to the other.

[0034] In the above technical solution, the second stator is spaced radially outside the first stator, and the rotor structure is arranged radially between the first stator and the second stator.

[0035] In this technical solution, the first stator and the second stator are mainly arranged radially along the stator structure to form a radial magnetic flux structure. At this time, the rotor structure is located between the first stator and the second stator. That is, along the radial direction of the stator structure, the first stator, the rotor structure and the second stator are respectively from the inside to the outside.

[0036] A second aspect of the present invention provides an electric drive device, comprising: a housing; and a motor structure as described in the first aspect of the technical solution above, disposed within the housing.

[0037] The electric drive device provided according to the second aspect of the present invention includes a housing and a motor structure disposed within the housing. The electric drive device is provided with the motor structure of the first aspect of the technical solution described above, and therefore has the beneficial effects of the motor structure described above, which will not be repeated here.

[0038] Among them, electric drive equipment includes equipment that uses a motor to drive a load, including but not limited to electrical appliances, electric vehicles and other equipment.

[0039] Additional aspects and advantages of the invention will become apparent in the following description or may be learned by practice of the invention. Attached Figure Description

[0040] Figure 1 A schematic diagram of a motor structure according to an embodiment of the present invention is shown;

[0041] Figure 2 A schematic diagram of a motor structure according to an embodiment of the present invention is shown;

[0042] Figure 3 A schematic diagram of a motor structure according to an embodiment of the present invention is shown;

[0043] Figure 4 A schematic diagram of a motor structure according to an embodiment of the present invention is shown;

[0044] Figure 5 It shows Figure 4 A schematic diagram of the structure of the electric motor, showing the rotor structure hidden behind the rotor, unfolding in a straight line along the direction of the arrow.

[0045] Figure 6 A schematic diagram of a structure showing the first stator tooth and the second stator slot facing each other is shown in one embodiment of the present invention;

[0046] Figure 7 A schematic diagram of a structure in which the first stator tooth and the second stator slot are not directly opposite each other is shown in one embodiment of the present invention;

[0047] Figure 8 A schematic diagram of the stator structure according to an embodiment of the present invention is shown;

[0048] Figure 9 It shows Figure 1 A schematic diagram of the unfolded structure of the middle stator;

[0049] Figure 10 A schematic diagram of the structure of the first stator tooth according to an embodiment of the present invention is shown;

[0050] Figure 11 A schematic diagram of the structure of the first stator tooth according to an embodiment of the present invention is shown;

[0051] Figure 12 A schematic diagram of the structure of the second stator slot according to an embodiment of the present invention is shown;

[0052] Figure 13 A schematic diagram of the structure of the second stator slot according to an embodiment of the present invention is shown;

[0053] Figure 14 A schematic diagram of the structure of the second stator slot according to an embodiment of the present invention is shown;

[0054] Figure 15 A schematic diagram of a motor structure according to an embodiment of the present invention is shown;

[0055] Figure 16 A schematic diagram of an electrically driven device according to an embodiment of the present invention is shown.

[0056] in, Figures 1 to 16 The correspondence between the reference numerals and component names in the attached drawings is as follows:

[0057] 100: Motor structure; 102: Stator structure; 1022: First stator; 1024: First stator tooth; 1026: First stator slot; 1032: Second stator; 1034: Second stator tooth; 1036: Second stator slot; 104: Rotor structure; 1042: Rotor core; 105: Permanent magnet; 106: Winding; 108: Circumferential symmetry axis; 200: Electric drive device; 202: Housing. Detailed Implementation

[0058] To better understand the above-described objectives, features, and advantages of the embodiments of the present invention, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0059] Many specific details are set forth in the following description in order to provide a full understanding of this application. However, embodiments of the invention may also be implemented in other ways different from those described herein. Therefore, the scope of protection of this application is not limited to the specific embodiments disclosed below.

[0060] The following reference Figures 1 to 16 Some embodiments of the present invention are described.

[0061] Example 1

[0062] like Figure 1 As shown, the motor structure 100 proposed in this embodiment mainly includes a stator structure 102 and a rotor structure 104. The stator structure 102 and the rotor structure 104 are coaxially arranged so that when the stator structure 102 is energized, they generate mutual magnetic fields, thereby driving the rotor structure 104 to rotate. In this application, the stator structure 102 specifically includes two stators, namely a first stator 1022 and a second stator 1032 arranged at intervals. By setting the rotor structure 104 between the first stator 1022 and the second stator 1032, after winding 106 is formed on at least one of the first stator 1022 and the second stator 1032, the magnetic field applied to the rotor structure 104 changes according to the energization, thereby driving the rotor structure 104 to rotate continuously.

[0063] It should be emphasized that in this application, the first stator 1022 is provided with a plurality of first stator teeth 1024, and a first stator slot 1026 is formed between the plurality of stator teeth. By restricting the shape of the first stator slot 1026, at least two first stator slots 1026 are restricted to have different shapes, so that the distribution of the entire first stator teeth 1024 is not completely uniform. As a result, the overall motor structure 100 can effectively reduce the cogging torque and torque pulsation of the motor during operation.

[0064] Similarly, for the second stator 1032, a plurality of second stator teeth 1034 are provided on the second stator 1032, and second stator slots 1036 are formed between the plurality of stator teeth. By restricting the shape of the second stator slots 1036, at least two second stator slots 1036 are restricted to have different shapes, so that the distribution of the entire second stator teeth 1034 is not completely uniform. Thus, when the motor structure 100 is running, under the combined action of the first stator 1022 and the second stator 1032, the cogging torque and torque pulsation of the motor can be effectively reduced.

[0065] In one specific embodiment, at least two first stator slots 1026 have different shapes.

[0066] In another specific embodiment, at least two second stator slots 1036 have different shapes.

[0067] In another specific embodiment, at least two first stator slots 1026 have different shapes, and at least two second stator slots 1036 have different shapes.

[0068] Among them, such as Figure 1 and Figure 3 As shown, the first stator teeth on the first stator are unevenly arranged, while the second stator teeth on the second stator are evenly arranged.

[0069] It's alright, such as Figure 2 As shown, the first stator teeth on the first stator are evenly distributed, while the second stator teeth on the second stator are unevenly distributed.

[0070] Furthermore, a winding slot is formed between two adjacent stator teeth so that the winding 106 can be wound on the winding slot, which can generate a magnetic field on the rotor to achieve the stator function.

[0071] Furthermore, the specific motor structure 100 can be a bidirectional motor or a unidirectional motor that rotates in a specified direction.

[0072] It should be added that by utilizing the first stator 1022 and the second stator 1032, leakage flux can be reduced and magnetic flux linkage can be increased, thereby improving the output torque and power density of the motor.

[0073] To clearly demonstrate the alignment of teeth and slots between the first and second stators, the following can be used: Figure 4 The circumferential motor structure unfolds in a straight line along the circumference, specifically as follows: Figure 5 As shown.

[0074] In a specific embodiment, such as Figure 6As shown, the circumferential positions of the first stator tooth 1024 and the second stator slot 1036 are restricted, that is, at least one circumferential axis of symmetry 108 of the first stator slot 1026 and the circumferential axis of symmetry 108 of the second stator tooth 1034 are projected onto the end face of the stator structure 102, thereby forming a positive relative positional relationship. Based on this, it is convenient to divide the shape of the first stator tooth 1024 to achieve a non-uniform distribution of stator teeth, thereby optimizing the cogging torque and torque pulsation of the motor structure 100 as a whole during operation.

[0075] Similarly, the circumferential positions of the second stator tooth 1034 and the first stator slot 1026 can be restricted, that is, at least one circumferential axis of symmetry 108 of the second stator slot 1036 and the circumferential axis of symmetry 108 of the first stator tooth 1024 are required to coincide on the projection of the end face of the stator structure 102, thereby forming a positive relative positional relationship. Based on this, it is convenient to divide the shape of the second stator tooth 1034 to achieve a non-uniform distribution of stator teeth, thereby optimizing the cogging torque and torque pulsation of the motor structure 100 as a whole during operation.

[0076] Example 2

[0077] like Figure 1 As shown, the motor structure 100 proposed in this embodiment mainly includes a stator structure 102 and a rotor structure 104. The stator structure 102 and the rotor structure 104 are coaxially arranged so that when the stator structure 102 is energized, they generate mutual magnetic fields, thereby driving the rotor structure 104 to rotate. In this application, the stator structure 102 specifically includes two stators, namely a first stator 1022 and a second stator 1032 arranged at intervals. By setting the rotor structure 104 between the first stator 1022 and the second stator 1032, after winding 106 is formed on at least one of the first stator 1022 and the second stator 1032, the magnetic field applied to the rotor structure 104 changes according to the energization, thereby driving the rotor structure 104 to rotate continuously.

[0078] It should be emphasized that in this application, the first stator 1022 is provided with a plurality of first stator teeth 1024, and a first stator slot 1026 is formed between the plurality of stator teeth. By restricting the shape of the first stator slot 1026, at least two first stator slots 1026 are restricted to have different shapes, so that the distribution of the entire first stator teeth 1024 is not completely uniform. As a result, the overall motor structure 100 can effectively reduce the cogging torque and torque pulsation of the motor during operation.

[0079] Similarly, for the second stator 1032, a plurality of second stator teeth 1034 are provided on the second stator 1032, and second stator slots 1036 are formed between the plurality of stator teeth. By restricting the shape of the second stator slots 1036, at least two second stator slots 1036 are restricted to have different shapes, so that the distribution of the entire second stator teeth 1034 is not completely uniform. Thus, when the motor structure 100 is running, under the combined action of the first stator 1022 and the second stator 1032, the cogging torque and torque pulsation of the motor can be effectively reduced.

[0080] In a specific embodiment, such as Figure 7 As shown, the circumferential positions of the first stator tooth 1024 and the second stator slot 1036 are restricted, that is, at least one circumferential axis of symmetry 108 of the first stator slot 1026 and the circumferential axis of symmetry 108 of the second stator tooth 1034 are not coincident on the projection of the end face of the stator structure 102, thereby forming a misaligned relative positional relationship, thereby optimizing the cogging torque and torque pulsation of the motor structure 100 as a whole during operation.

[0081] Similarly, the circumferential positions of the second stator tooth 1034 and the first stator slot 1026 can be restricted, that is, at least one circumferential axis of symmetry 108 of the second stator slot 1036 and the circumferential axis of symmetry 108 of the first stator tooth 1024 are not coincident on the projection of the stator structure 102 end face, thereby forming a misaligned relative positional relationship, thereby optimizing the cogging torque and torque pulsation of the motor structure 100 as a whole during operation.

[0082] Furthermore, when there is a certain angle between the projections of the first stator slot 1026 and the second stator tooth 1034, the angle needs to be limited to less than 60 / Z, where Z is the specific number of the second stator teeth 1034. This allows the second stator teeth 1034 to be positioned on the basis of the second stator 1032, ensuring that the angle between the first stator slot 1026 and the second stator tooth 1034 is as small as possible, while still requiring a certain degree of misalignment. Similarly, when there is an angle between the second stator slot 1036 and the first stator tooth 1024, the angle should be greater than 0 and less than 60 / Z, where Z is the specific number of the first stator teeth 1024, to facilitate effective reduction of cogging torque and torque pulsation in the future.

[0083] Furthermore, when the multiple first stator slots 1026 on the first stator 1022 have different shapes, that is, the distribution or shape of the first stator teeth 1024 is not completely consistent, the spacing angle of the first stator teeth 1024 can be restricted. That is, the included angle between two adjacent first stator teeth 1024 is greater than 240 / Z and less than 480 / Z, where Z is the specific number of first stator teeth 1024. This satisfies the normal motor operating performance and ensures the normal operation of the motor structure 100. Similarly, when the second stator slots 1036 on the second stator 1032 have at least two shapes, the distribution or shape of the second stator teeth 1034 is not completely consistent. The spacing angle of the second stator teeth 1034 can be restricted. That is, the included angle between two adjacent second stator teeth 1034 is greater than 240 / Z and less than 480 / Z, where Z is the specific number of second stator teeth 1034. This satisfies the normal motor operating performance and ensures the normal operation of the motor structure 100.

[0084] Example 3

[0085] This embodiment proposes a motor structure 100, which mainly includes a stator structure 102 and a rotor structure 104. The stator structure 102 and the rotor structure 104 are coaxially arranged so that when the stator structure 102 is energized, they generate mutual magnetic fields, thereby driving the rotor structure 104 to rotate. In this application, the stator structure 102 specifically includes two stators, namely a first stator 1022 and a second stator 1032 arranged at intervals. By setting the rotor structure 104 between the first stator 1022 and the second stator 1032, after winding 106 is formed on at least one of the first stator 1022 and the second stator 1032, the magnetic field applied to the rotor structure 104 changes according to the energization, thereby driving the rotor structure 104 to rotate continuously.

[0086] The first stator 1022 and the second stator 1032 are mainly arranged along the axial direction of the stator structure 102 to form an axial magnetic flux structure. At this time, the rotor structure 104 is located between the first stator 1022 and the second stator 1032, that is, along the axial direction of the stator structure 102, the first stator 1022, the rotor structure 104 and the second stator 1032 are respectively from one end to the other end.

[0087] More specifically, such as Figure 15As shown, this application also provides a specific embodiment of a dual-stator permanent magnet motor, including: a rotor (i.e., rotor structure 104) in the shape of a ring, with multiple permanent magnets 105 arranged at intervals along the circumference; a left stator (i.e., the first stator 1022) and a right stator (i.e., the second stator 1032), both in the shape of a ring, arranged coaxially side by side; the rotor is also arranged coaxially side by side between the left stator and the right stator. Multiple grooves (i.e., the first stator groove 1026 and the second stator groove 1036) are formed along the circumference on the right end face of the left stator and the left end face of the right stator, with stator teeth (i.e., the first stator tooth 1024 and the second stator tooth 1034) formed between adjacent grooves. The number of stator teeth on the left stator is equal to the number of stator teeth on the right stator. At least one stator tooth on the left stator is directly opposite a groove on the right stator, or at least one stator tooth on the right stator is directly opposite a groove on the left stator; at least one stator tooth on the left stator is not directly opposite a groove on the right stator, or at least one stator tooth on the right stator is not directly opposite a groove on the left stator; among the left and right stators, at least one stator has stator teeth that are not uniformly distributed in the circumferential direction. A stator winding 106 is placed in a groove on at least one stator. This invention effectively reduces the cogging torque and torque ripple of the motor by setting the relative positional relationship between the stator teeth and grooves on the left and right stators.

[0088] It should be emphasized that in this application, the first stator 1022 is provided with a plurality of first stator teeth 1024, and a first stator slot 1026 is formed between the plurality of stator teeth. By restricting the shape of the first stator slot 1026, at least two first stator slots 1026 are restricted to have different shapes, so that the distribution of the entire first stator teeth 1024 is not completely uniform. As a result, the overall motor structure 100 can effectively reduce the cogging torque and torque pulsation of the motor during operation.

[0089] Similarly, for the second stator 1032, a plurality of second stator teeth 1034 are provided on the second stator 1032, and second stator slots 1036 are formed between the plurality of stator teeth. By restricting the shape of the second stator slots 1036, at least two second stator slots 1036 are restricted to have different shapes, so that the distribution of the entire second stator teeth 1034 is not completely uniform. Thus, when the motor structure 100 is running, under the combined action of the first stator 1022 and the second stator 1032, the cogging torque and torque pulsation of the motor can be effectively reduced.

[0090] Example 4

[0091] This embodiment proposes a motor structure 100, which mainly includes a stator structure 102 and a rotor structure 104. The stator structure 102 and the rotor structure 104 are coaxially arranged so that when the stator structure 102 is energized, they generate mutual magnetic fields, thereby driving the rotor structure 104 to rotate. In this application, the stator structure 102 specifically includes two stators, namely a first stator 1022 and a second stator 1032 arranged at intervals. By setting the rotor structure 104 between the first stator 1022 and the second stator 1032, after winding 106 is formed on at least one of the first stator 1022 and the second stator 1032, the magnetic field applied to the rotor structure 104 changes according to the energization, thereby driving the rotor structure 104 to rotate continuously.

[0092] The first stator 1022 and the second stator 1032 are mainly arranged radially along the stator structure 102 to form a radial magnetic flux structure. At this time, the rotor structure 104 is located between the first stator 1022 and the second stator 1032. That is, along the radial direction of the stator structure 102, the first stator 1022, the rotor structure 104 and the second stator 1032 are respectively from the inside to the outside.

[0093] More specifically, this application also provides a specific embodiment of a dual-stator permanent magnet motor, comprising: a rotor (i.e., rotor structure 104), which is cylindrical and has a plurality of permanent magnets 105 arranged at intervals along the circumference; an outer stator (i.e., the second stator 1032) and an inner stator (i.e., the first stator 1022), both cylindrical with different diameters, and coaxially mounted; the rotor is also coaxially mounted between the outer stator and the inner stator. Multiple grooves (i.e., the second stator groove 1036 and the first stator groove 1026) are formed along the circumference on the inner wall of the outer stator and the outer wall of the inner stator, and stator teeth (i.e., the second stator groove 1036 and the first stator groove 1026) are formed between adjacent grooves. The number of stator teeth on the outer stator is equal to the number of stator teeth on the inner stator. At least one stator tooth on the outer stator is directly opposite a groove on the inner stator, or at least one stator tooth on the inner stator is directly opposite a groove on the outer stator; at least one stator tooth on the outer stator is not directly opposite a groove on the inner stator, or at least one stator tooth on the inner stator is not directly opposite a groove on the outer stator; among the outer and inner stators, at least one stator has stator teeth that are not uniformly distributed in the circumferential direction. A stator winding 106 is placed in a groove on at least one stator. This specific embodiment effectively reduces the cogging torque and torque pulsation of the motor by setting the relative positional relationship between the stator teeth and grooves on the outer and inner stators.

[0094] It should be emphasized that in this application, the first stator 1022 is provided with a plurality of first stator teeth 1024, and a first stator slot 1026 is formed between the plurality of stator teeth. By restricting the shape of the first stator slot 1026, at least two first stator slots 1026 are restricted to have different shapes, so that the distribution of the entire first stator teeth 1024 is not completely uniform. As a result, the overall motor structure 100 can effectively reduce the cogging torque and torque pulsation of the motor during operation.

[0095] Similarly, for the second stator 1032, a plurality of second stator teeth 1034 are provided on the second stator 1032, and second stator slots 1036 are formed between the plurality of stator teeth. By restricting the shape of the second stator slots 1036, at least two second stator slots 1036 are restricted to have different shapes, so that the distribution of the entire second stator teeth 1034 is not completely uniform. Thus, when the motor structure 100 is running, under the combined action of the first stator 1022 and the second stator 1032, the cogging torque and torque pulsation of the motor can be effectively reduced.

[0096] Based on any of the above embodiments, the axial length of the stator core of the first stator 1022, the axial length of the stator core of the second stator 1032, the axial length of the rotor core 1042, and the axial length of the permanent magnet 105 can be the same or different, so as to utilize the end effect.

[0097] Based on any of the above embodiments, a magnetically conductive block is formed between two adjacent permanent magnet slots. The two adjacent magnetically conductive blocks can be connected by magnetically conductive material or non-magnetically conductive material, or not connected at all.

[0098] The stator core of the first stator 1022, the stator core of the second stator 1032, and the rotor core 1042 are made of solid steel, laminated silicon steel sheets, amorphous ferromagnetic composite materials, or SMC (soft magnetic composite) materials; in addition, the stator winding 106 is made of copper wire, aluminum wire, or copper-aluminum mixed wire.

[0099] Example 5

[0100] like Figure 1As shown, the motor structure 100 proposed in this embodiment mainly includes a stator structure 102 and a rotor structure 104. The stator structure 102 and the rotor structure 104 are coaxially arranged so that when the stator structure 102 is energized, they generate mutual magnetic fields, thereby driving the rotor structure 104 to rotate. In this application, the stator structure 102 specifically includes two stators, namely a first stator 1022 and a second stator 1032 arranged at intervals. By setting the rotor structure 104 between the first stator 1022 and the second stator 1032, after winding 106 is formed on at least one of the first stator 1022 and the second stator 1032, the magnetic field applied to the rotor structure 104 changes according to the energization, thereby driving the rotor structure 104 to rotate continuously.

[0101] It should be emphasized that in this application, the first stator 1022 is provided with a plurality of first stator teeth 1024, and a first stator slot 1026 is formed between the plurality of stator teeth. By restricting the shape of the first stator slot 1026, at least two first stator slots 1026 are restricted to have different shapes, so that the distribution of the entire first stator teeth 1024 is not completely uniform. As a result, the overall motor structure 100 can effectively reduce the cogging torque and torque pulsation of the motor during operation.

[0102] Similarly, for the second stator 1032, a plurality of second stator teeth 1034 are provided on the second stator 1032, and second stator slots 1036 are formed between the plurality of stator teeth. By restricting the shape of the second stator slots 1036, at least two second stator slots 1036 are restricted to have different shapes, so that the distribution of the entire second stator teeth 1034 is not completely uniform. Thus, when the motor structure 100 is running, under the combined action of the first stator 1022 and the second stator 1032, the cogging torque and torque pulsation of the motor can be effectively reduced.

[0103] In addition, in this embodiment, the rotor structure 104 mainly includes a rotor core 1042 and a permanent magnet 105. The rotor core 1042 is provided with a plurality of permanent magnet slots, and each permanent magnet slot is provided with a permanent magnet 105, thereby making it easy to install and position the permanent magnet.

[0104] The permanent magnet slots are arranged circumferentially along the rotor core 1042 to generate a multi-pole magnetic field along the circumferential direction.

[0105] Furthermore, the permanent magnet slots are arranged uniformly around the axis of the rotor core 1042.

[0106] The polarities of multiple permanent magnets 105 are alternately arranged along the circumference of the rotor core 1042 to generate a multi-pole magnetic field along the circumference, so as to realize the normal operation of the motor structure 100.

[0107] In one specific embodiment, a dual-stator permanent magnet motor is provided, comprising: a rotor (i.e., rotor structure 104), which is cylindrical and has multiple permanent magnets 105 arranged at intervals along the circumference; an outer stator and an inner stator (a first stator 1022 and a second stator 1032), both cylindrical with different diameters, and coaxially mounted; the rotor is also coaxially mounted between the outer stator and the inner stator. Multiple grooves are formed along the circumference on the inner wall of the outer stator and the outer wall of the inner stator, with stator teeth formed between adjacent grooves. The number of stator teeth on the outer stator is equal to the number of stator teeth on the inner stator, both having 12 stator teeth.

[0108] The stator teeth on the inner stator are uniformly distributed circumferentially; the stator teeth on the outer stator are non-uniformly distributed circumferentially, and the angle between adjacent stator teeth is periodically distributed in an alternating pattern of large and small angles, with the smaller angle β being the smaller one. 2i-1,2i =23°, a relatively large stator tooth inter-tooth angle β 2i,2i+1 =37°, all satisfying: 20°<β<40° (the number of upper stator teeth of outer stator 4 is Z=12), subscript i=1,2,3,…,6.

[0109] like Figure 1 As shown, all stator teeth on the inner stator are directly opposite the grooves on the outer stator; all stator teeth on the outer stator are not directly opposite the grooves on the inner stator, and the angle γ between the non-directly opposite stator teeth and grooves is 3°, satisfying: 0 < γ < 5°. To facilitate observation of the relative positional relationship between the stator teeth and grooves, the outer and inner stators are unfolded circumferentially (keeping the relative positional relationship between the stator teeth and grooves unchanged during the unfolding process). Figure 8 and Figure 9 As shown, where, Figure 8 The structure is only for a portion of the stator teeth.

[0110] The stator winding 106 is placed in the groove of the outer stator, while the winding 106 is not placed in the groove of the inner stator.

[0111] Based on the relative relationship between the stator slots and stator teeth in the above specific embodiments, the cogging torque and torque pulsation of the motor are effectively reduced. Compared with the prior art, the torque pulsation is reduced by 57% to 67%, the cogging torque is reduced by 49% to 69%, and the average torque is reduced by only 2.2% to 3.7%.

[0112] In another specific embodiment, such as Figure 2 As shown, the stator teeth on the inner stator are non-uniformly distributed in the circumferential direction, while the stator teeth on the outer stator are uniformly distributed in the circumferential direction; at the same time, all the stator teeth on the inner stator are not directly opposite the grooves on the outer stator, while all the stator teeth on the outer stator are directly opposite the grooves on the inner stator.

[0113] Among them, such as Figure 10and Figure 11 As shown, an example of determining the circumferential symmetry axis 108 of the first stator tooth 1024 is provided.

[0114] Of course, the determination of the circumferential axis of symmetry of the second stator tooth 1034 can also be referenced. Figure 10 and Figure 11 As shown.

[0115] like Figure 12 , Figure 13 and Figure 14 As shown, an example of determining the circumferential axis of symmetry 108 of the second stator slot 1036 is provided.

[0116] Of course, the determination of the circumferential axis of symmetry of the first stator slot 1026 can also refer to Figures 12 to 14 As shown.

[0117] Example 6

[0118] like Figure 16 As shown, the electric drive device 200 proposed in this embodiment includes a housing 202 and a motor structure 10 disposed in the housing 202. The housing 202 is provided with the motor structure 10 in the above embodiment 5, and therefore has the beneficial effects of the above motor structure 10, which will not be described again here.

[0119] Among them, electric drive equipment includes equipment that uses a motor to drive a load, including but not limited to electrical appliances, electric vehicles and other equipment.

[0120] According to the motor structure and electric drive device provided by the present invention, by setting a first stator slot or a second stator slot with different shapes, the cogging torque and torque pulsation of the motor can be effectively reduced.

[0121] In this invention, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance; the term "multiple" refers to two or more unless otherwise explicitly defined. The terms "install," "connect," "link," and "fix" should be interpreted broadly. For example, "connect" can be a fixed connection, a detachable connection, or an integral connection; "link" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0122] In the description of this invention, it should be understood that the terms "upper," "lower," "left," "right," "front," "rear," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or unit referred to must have a specific orientation or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0123] In the description of this specification, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0124] The above are merely preferred embodiments of the present invention and are not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A motor structure, characterized in that, include: The stator structure includes a first stator and a second stator spaced apart. The rotor structure is coaxially arranged with the stator structure, and the rotor structure is disposed between the first stator and the second stator; Stator windings are provided on the first stator and / or the second stator; The first stator has a plurality of first stator teeth on the side facing the rotor structure, and the second stator has a plurality of second stator teeth on the side facing the rotor structure. The shape of the first stator slot formed between at least two first stator teeth is different, and / or the shape of the second stator slot formed between at least two second stator teeth is different. When at least two of the first stator slots have different shapes, the circumferential angle between any two adjacent first stator teeth satisfies (240 / Z, 480 / Z), where Z is the number of the first stator teeth; When at least two of the second stator slots have different shapes, the circumferential angle between any two adjacent second stator teeth satisfies (240 / Z, 480 / Z), where Z is the number of the second stator teeth.

2. The motor structure according to claim 1, characterized in that, include: On the end face projection surface of the stator structure, at least one of the circumferential symmetry axes of the first stator slot coincides with the circumferential symmetry axis of the second stator tooth; or On the end face projection surface of the stator structure, at least one of the circumferential axes of symmetry of the second stator slot coincides with the circumferential axis of symmetry of the first stator tooth.

3. The motor structure according to claim 1, characterized in that, On the end face projection plane of the stator structure, at least one of the circumferential axes of symmetry of the first stator slot does not coincide with the circumferential axis of symmetry of the second stator tooth; or On the end face projection surface of the stator structure, at least one of the circumferential axes of symmetry of the second stator slot does not coincide with the circumferential axis of symmetry of the first stator tooth.

4. The motor structure according to claim 3, characterized in that, The included angle between the first stator slot and the second stator tooth, whose circumferential axes of symmetry do not coincide, satisfies (0, 60 / Z), where Z is the number of the second stator teeth; or The included angle between the second stator slot and the first stator tooth, whose circumferential axes of symmetry do not coincide, satisfies (0, 60 / Z), where Z is the number of the first stator teeth.

5. The motor structure according to claim 1, characterized in that, The number of the first stator teeth is the same as the number of the second stator teeth.

6. The motor structure according to any one of claims 1 to 5, characterized in that, The rotor structure specifically includes: The rotor core has multiple permanent magnet slots circumferentially arranged. A permanent magnet is disposed in the permanent magnet slot.

7. The motor structure according to claim 6, characterized in that, The polarities of the multiple permanent magnets are alternately arranged along the circumference of the rotor core.

8. The motor structure according to any one of claims 1 to 5, characterized in that, The first stator and the second stator are spaced apart along the axial direction of the stator structure, and the rotor structure is disposed between the first stator and the second stator along the axial direction of the stator structure.

9. The motor structure according to any one of claims 1 to 5, characterized in that, The second stator is spaced radially outward from the first stator, and the rotor structure is radially disposed between the first stator and the second stator.

10. An electrically driven device, characterized in that, include: case; The motor structure as described in any one of claims 1 to 9 is disposed within the housing.

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