Single stator radial flux motor

Abstract

The application discloses a single-stator radial flux motor and belongs to the technical field of motors. The motor comprises a shell, a stator, a first rotor, a second rotor, a first output shaft and a second output shaft. The stator is located in the shell and connected with the inner wall of the shell. The first rotor and the second rotor are both located in the stator, and the first rotor and the second rotor are spaced apart along the axial direction of the stator, and the axis of the first rotor and the axis of the second rotor both coincide with the axis of the stator. The first output shaft is fixedly connected with the first rotor, the second output shaft is fixedly connected with the second rotor, and the first output shaft and the second output shaft are rotatably connected with the shell. The scheme can reduce the number of stator winding ends by adopting the shared stator mode, shorten the axial length of the motor and reduce the amount of stator winding. Meanwhile, the multiple motor rotors are compactly arranged along the axial direction and have very small rotating air gaps, which not only can realize magnetic isolation between the two motors, but also is beneficial to shortening the axial length of the motor.

Description

Technical Field

[0001] This application relates to the field of motor technology, and in particular to a single-stator radial flux motor. Background Technology

[0002] With the development of technology, dual-axis motors (such as counter-rotating motors) have gradually come into people's view. A dual-axis motor refers to a motor with two output shafts.

[0003] Currently, dual-axis motors typically consist of two stators and two rotors. The two stators are coaxially distributed, and each stator is fitted together with a rotor to drive the output shaft connected to the rotor to rotate.

[0004] In related technologies, in order to prevent mutual interference between the magnetic circuits generated by the two stators, the two stators are usually made to have a certain gap in the axial direction, which ultimately leads to an increase in the axial length of the dual-axis motor. Summary of the Invention

[0005] This application provides a single-stator radial flux motor, which solves the problem of increased axial length in dual-axis motors caused by the gap between stators in related technologies. The technical solution is as follows:

[0006] This application provides a single-stator radial flux motor, the motor comprising: a housing, a stator, a first rotor, a second rotor, a first output shaft, and a second output shaft;

[0007] The stator is located inside the housing and is connected to the inner wall of the housing;

[0008] Both the first rotor and the second rotor are located within the stator, and the first rotor and the second rotor are spaced apart along the axial direction of the stator, and the axes of the first rotor and the second rotor coincide with the axis of the stator;

[0009] The first output shaft is fixedly connected to the first rotor, the second output shaft is fixedly connected to the second rotor, and the first output shaft and the second output shaft are respectively rotatably connected to the housing.

[0010] In one possible implementation, the stator includes: a stator yoke, a plurality of stator teeth, a plurality of stator pole shoes, and a plurality of stator windings;

[0011] The stator yoke has a cylindrical structure;

[0012] The stator teeth have a strip-shaped structure. The plurality of stator teeth are located inside the stator yoke and are evenly distributed along the circumferential direction of the inner wall of the stator yoke. They are connected to the inner wall of the stator yoke respectively, and the plurality of stator teeth are not connected to each other.

[0013] The plurality of stator pole shoes are respectively located at one end of the plurality of stator teeth near the axis of the stator yoke and are connected to the stator teeth, and the plurality of stator pole shoes are not connected to each other;

[0014] Each of the stator windings is wound on at least one of the stator teeth and is located between the stator yoke and the stator pole shoe.

[0015] In one possible implementation, each of the stator windings is wound around one of the stator teeth.

[0016] In one possible implementation, the stator yoke, the stator teeth, and the stator pole shoes are all made of multiple silicon steel sheets stacked along the axial direction of the stator.

[0017] In one possible implementation, the first output shaft includes a first shaft segment and a second shaft segment that are fixedly connected, and the second output shaft is a hollow shaft;

[0018] The first shaft segment is fixedly connected to the first rotor and rotatably connected to the housing. A portion of the second shaft segment is located inside the second output shaft, and another portion of the second shaft segment protrudes from the end of the second output shaft away from the first shaft segment. The second shaft segment is rotatably connected to the second output shaft.

[0019] One end of the second output shaft is fixedly connected to the second rotor, and the other end protrudes from the housing. The second output shaft is rotatably connected to the housing.

[0020] In one possible implementation, the first rotor includes a first rotor core and a plurality of first permanent magnets;

[0021] The first rotor core has a cylindrical structure;

[0022] The plurality of first permanent magnets are located outside the first rotor core and are evenly distributed along the circumferential direction of the outer surface of the first rotor core, and are respectively fixedly connected to the outer surface of the first rotor core.

[0023] In one possible implementation, the first rotor includes a first rotor core and a plurality of first permanent magnets;

[0024] The first rotor core has a cylindrical structure and a plurality of first axial through holes, which are evenly distributed along the circumferential direction of the outer surface of the first rotor core.

[0025] The plurality of first permanent magnets are respectively located in the plurality of first axial through holes and are fixedly connected to the inner wall of the first axial through holes.

[0026] In one possible implementation, the second rotor includes a second rotor core and a plurality of second permanent magnets;

[0027] The second rotor core has a cylindrical structure;

[0028] The plurality of second permanent magnets are located outside the second rotor core and are evenly distributed along the circumferential direction of the outer surface of the second rotor core, and are respectively fixedly connected to the outer surface of the second rotor core.

[0029] In one possible implementation, the second rotor includes a second rotor core and a plurality of second permanent magnets;

[0030] The second rotor core has a cylindrical structure and a plurality of second axial through holes, which are evenly distributed along the circumferential direction of the outer surface of the second rotor core.

[0031] The plurality of second permanent magnets are respectively located in the plurality of second axial through holes and are fixedly connected to the inner wall of the second axial through holes.

[0032] In one possible implementation, the number of slots Z of the stator s The first number of poles Z of the first rotor is a positive integer multiple of the number of phases M of the single-stator radial flux motor. r1 and the second pole number Z of the second rotor r2 All are positive even numbers, and Z r1 =k1×Z s -L, Z r2 =k2×Z s +L, Z s ÷M÷GCD(Z s Z r1 ) and Z s ÷M÷GCD(Z s Z r2 All are positive integers, where k1 and k2 are either both positive odd numbers or both are both positive even numbers, L, k1×Z s and k2×Z s All are positive odd numbers or all are positive even numbers, L <Z s GCD(Z) s Z r1 ) is Z s and Z r1 The greatest common divisor of GCD (Z) s Z r2 ) is Z s and Z r2 The greatest common divisor.

[0033] In one possible implementation, the motor further includes: a third rotor and a third output shaft;

[0034] The third rotor is located inside the stator, and the first rotor, the second rotor, and the third rotor are spaced apart along the axial direction of the stator, and the axis of the third rotor coincides with the axis of the stator;

[0035] The third output shaft is fixedly connected to the third rotor and rotatably connected to the housing.

[0036] The beneficial effects of the technical solutions provided in this application are:

[0037] In the solution provided in this application embodiment, the motor includes one stator, two rotors, and two output shafts. The two output shafts are fixedly connected to the two rotors respectively, and are used to output power to the outside. Using this solution, the motor has only one stator, reducing the number of stator winding ends, which shortens the axial length of the motor and reduces the amount of stator windings used. Simultaneously, the multiple motor rotors are compactly arranged axially with very small air gaps between them, which not only achieves magnetic isolation between the two motors but also helps to shorten the axial length of the motor.

[0038] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit this application. Attached Figure Description

[0039] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0040] Figure 1 This is a cross-sectional view of a single-stator radial flux motor provided in an embodiment of this application;

[0041] Figure 2 This is a cross-sectional view of a housing provided in an embodiment of this application;

[0042] Figure 3 This is a cross-sectional view of a housing provided in an embodiment of this application;

[0043] Figure 4 This is a schematic diagram of the structure of a stator provided in an embodiment of this application;

[0044] Figure 5 This is an exploded view of a stator provided in an embodiment of this application;

[0045] Figure 6 This is a partial structural diagram of a stator provided in an embodiment of this application;

[0046] Figure 7 This is a schematic diagram of the structure of a rotor provided in an embodiment of this application;

[0047] Figure 8 This is a side view of a first rotor provided in an embodiment of this application;

[0048] Figure 9 This is a schematic diagram of the structure of a second rotor provided in an embodiment of this application;

[0049] Figure 10 This is a schematic diagram of the structure of a rotor provided in an embodiment of this application;

[0050] Figure 11 This is a side view of a first rotor provided in an embodiment of this application;

[0051] Figure 12 This is a schematic diagram of the structure of a second rotor provided in an embodiment of this application;

[0052] Figure 13 This is a side view of a first rotor provided in an embodiment of this application;

[0053] Figure 14 This is a schematic diagram of the structure of a second rotor provided in an embodiment of this application;

[0054] Figure 15 This is a side view of a first rotor provided in an embodiment of this application;

[0055] Figure 16 This is a schematic diagram of the structure of a second rotor provided in an embodiment of this application;

[0056] Figure 17 This is a cross-sectional view of an electric motor provided in an embodiment of this application.

[0057] Legend

[0058] 1. Housing; 11. Housing body; 12. First end cap; 13. Second end cap; 1A. First through hole; 1B. Second through hole; 1C. Support protrusion;

[0059] 2. Stator; 21. Stator yoke; 22. Stator tooth; 23. Stator pole shoe; 24. Stator winding; 20. Stator axis; 211. Stator yoke segment; 221. Stator tooth segment; 231. Stator pole shoe segment;

[0060] 3. First rotor; 31. First rotor core; 32. First permanent magnet; 31A. First axial through hole;

[0061] 4. Second rotor; 41. Second rotor core; 42. Second permanent magnet; 41A. Second axial through hole;

[0062] 5. First output shaft; 51. First shaft segment; 52. Second shaft segment;

[0063] 6. Second output shaft;

[0064] 7. Third rotor;

[0065] 8. Third output shaft. Detailed Implementation

[0066] Unless otherwise defined, the technical or scientific terms used herein shall have the ordinary meaning understood by one of ordinary skill in the art to which this disclosure pertains. The terms “first,” “second,” “third,” and similar terms used in this patent application specification and claims do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, the terms “an” or “a” and similar terms do not indicate a quantity limitation, but rather indicate the presence of at least one. The terms “comprising” or “including” and similar terms mean that the element or object preceding “comprising” or “including” encompasses the element or object listed following “comprising” or “including” and its equivalents, and do not exclude other elements or objects. The terms “connected” or “linked” and similar terms are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. The terms “upper,” “lower,” “left,” “right,” etc., are used only to indicate relative positional relationships, and these relative positional relationships may change accordingly when the absolute position of the described object changes.

[0067] To make the objectives, technical solutions, and advantages of this application clearer, the embodiments of this application will be described in further detail below with reference to the accompanying drawings.

[0068] Figure 1 This is a cross-sectional view of a single-stator radial flux motor provided in an embodiment of this application. (See attached image.) Figure 1 As shown, the motor includes: housing 1, stator 2, first rotor 3, second rotor 4, first output shaft 5, and second output shaft 6.

[0069] The housing 1 has an internal cavity, and the stator 2 is located inside the cavity of the housing 1 and is fixedly connected to the inner wall of the housing 1.

[0070] Both the first rotor 3 and the second rotor 4 are located inside the stator 2; in other words, the outer surfaces of the first rotor 3 and the second rotor 4 are opposite to the inner wall of the stator 2. The first rotor 3 and the second rotor 4 are spaced apart along the axial direction of the stator 2, and the axes of both the first rotor 3 and the second rotor 4 coincide with the axis 2O of the stator 2. An air gap exists between the first rotor 3 and the second rotor 4 along the axial direction of the stator 2, which prevents wear between them and also prevents interference between the magnetic circuits of the first rotor 3 and the second rotor 4.

[0071] In some examples, the sum of the lengths of the first rotor 3, the second rotor 4, and the gap between the first rotor 3 and the second rotor 4 along the axial direction of the stator 2 is equal to the length of the stator. This approach helps ensure that the stator provides sufficient kinetic energy for the rotor's rotation while minimizing the length of the stator 2 along its axial direction, thus facilitating the control of the motor's dimensions along the axial direction of the stator 2.

[0072] The first output shaft 5 of the motor is fixedly connected to the first rotor 3, and the second output shaft 6 of the motor is fixedly connected to the second rotor 4. Moreover, the first output shaft 5 and the second output shaft 6 are rotatably connected to the housing 1. The first output shaft 5 and the second output shaft 6 can extend out of the housing 1 in the same direction or in different directions, as will be explained later.

[0073] In related technologies, dual-axis motors typically include two coaxially distributed stators. To prevent interference between the magnetic circuits generated by the two stators, a certain gap is usually maintained between them along the axial direction. The motor includes one stator, two rotors, and two output shafts, each fixedly connected to one of the two rotors for outputting power to the outside. This design reduces the number of stator winding ends, shortening the axial length and reducing the amount of stator windings used. Simultaneously, the compact axial arrangement of multiple rotors with small air gaps not only achieves magnetic isolation between the two motors but also helps to shorten the axial length. Furthermore, it reduces the amount of stator windings used, thus lowering the motor's cost.

[0074] The following is a detailed description of the various components in the motor provided in the embodiments of this application, as well as the connection relationships between the various components.

[0075] Casing 1

[0076] Figure 2 This is a cross-sectional view of a housing provided in an embodiment of this application. For example... Figure 2 As shown, the housing 1 may include: housing body 11, first end cap 12, and second end cap 13.

[0077] The housing body 11 may have a cylindrical structure. The first end cap 12 and the second end cap 13 are located at both ends of the housing body 11 and are connected to the housing body 11 respectively. The first end cap 12 and the housing body 11 can be fixedly connected by welding, gluing, snap-fitting or riveting, or can be detachably connected by bolts or threads. The second end cap 13 and the housing body 11 can be fixedly connected by welding, gluing, snap-fitting or riveting, or can be detachably connected by bolts or threads.

[0078] Optionally, the housing body 11 can have a cylindrical structure of any shape, as long as the interior of the housing body 11 has a cylindrical space to ensure that the stator 2 is installed inside the housing body 1.

[0079] The housing body 11, the first end cap 12, and the second end cap 13 form a receiving cavity. In some examples, the first end cap 12 may have a first through hole 1A, which connects the receiving cavity to the outside. The output shaft of the motor can extend out of the housing 1 through the first through hole 1A, which will be described later. In other examples, the first through hole 1A may be located on the second end cap 13. This situation is similar to the situation where the first through hole 1A is located on the first end cap 12, and will not be described in detail here.

[0080] Optionally, Figure 3 This is a cross-sectional view of a housing provided in an embodiment of this application. The first end cover 12 has a first through hole 1A, and the second end cover 13 has a second through hole 1B. At least two output shafts of the motor can extend out of the housing 1 through the first through hole 1A and the second through hole 1B.

[0081] Stator 2

[0082] Figure 4 This is a schematic diagram of a stator structure provided in an embodiment of this application. Figure 5 This is an exploded view of a stator provided in an embodiment of this application. For example... Figure 4 and Figure 5 As shown, the stator 2 includes: a stator yoke 21, multiple stator teeth 22, multiple stator pole shoes 23, and multiple stator windings 24.

[0083] The stator yoke 21 has a cylindrical structure, and the outer surface of the stator yoke 21 is in contact with the inner wall of the housing 1.

[0084] The stator teeth 22 have a strip-shaped structure, and multiple stator teeth 22 are located inside the stator yoke 21 and are evenly distributed along the circumferential direction of the inner wall of the stator yoke 21. The multiple stator teeth 22 are connected to the inner wall of the stator yoke 21 respectively, and the multiple stator teeth 22 are not connected to each other.

[0085] Multiple stator pole shoes 23 are located within the stator yoke 21, and each stator pole shoe 23 is located at one end of a stator tooth 22 near the axis of the stator yoke 21. The stator pole shoes 23 are connected to the stator teeth 22, and the multiple stator pole shoes 23 are not connected to each other in pairs;

[0086] The stator winding 4 is wound around the stator teeth 22, meaning the stator winding 24 is located between the stator yoke 21 and the stator pole shoe 23. In some examples, each stator winding 24 can be wound around one stator tooth 22. In other examples, each stator winding 24 can be wound around multiple stator teeth 22, such as 2, 4, or 7. The number of stator teeth 22 around which each stator winding 23 is wound can be set according to actual product requirements, and will not be elaborated here.

[0087] In some examples, the stator yoke 21, stator teeth 22, and stator pole shoes 23 can be integrally formed, or they can be fixedly connected by welding or gluing. The connection methods for the stator yoke 21, stator teeth 22, and stator pole shoes 23 can be those found in related technologies, and will not be elaborated here.

[0088] Figure 6 This is a partial structural diagram of a stator provided in an embodiment of this application. For example... Figure 6 As shown, the stator 2 is made by stacking multiple silicon steel sheets along the axial direction of the stator. In other words, the multiple silicon steel sheets are stacked and arranged in a block structure to form the stator core. After the stator winding 24 is wound on the stator core, the stator 2 is formed.

[0089] The thickness of the silicon steel sheet along the axial direction of stator 2 can be 0.1 mm, 0.2 mm, 0.5 mm, 1 mm, 2 mm, etc. The thickness of the silicon steel sheet can be set according to actual product requirements; no limitations are imposed here.

[0090] Each silicon steel sheet has a stator yoke block 211, a stator tooth block 221, and a stator pole shoe block 231, all of which are integrally formed within the same silicon steel sheet. When multiple silicon steel sheets are stacked, the multiple stator yoke blocks 211 are arranged opposite each other to form a stator yoke 21, the multiple stator tooth blocks 221 are arranged opposite each other to form a stator tooth 22, and the multiple stator pole shoe blocks 231 are arranged opposite each other to form a stator pole shoe 23, thereby forming the aforementioned stator core.

[0091] By adopting this radial flux scheme, silicon steel sheets are stacked along the axial direction to form stator 2. Compared with the axial flux scheme, the processing and assembly processes are simpler. Therefore, it is beneficial to reduce the difficulty of processing stator 2 and the difficulty of assembling stator 2, which is conducive to mass production and thus improves the production efficiency of stator 2.

[0092] First rotor 3

[0093] Figure 7 This is a schematic diagram of a rotor structure provided in an embodiment of this application. Figure 8 This is a side view of a first rotor provided in an embodiment of this application.

[0094] refer to Figure 7 and Figure 8 As shown, the first rotor 3 includes: a first rotor core 31 and a plurality of first permanent magnets 32.

[0095] The first rotor core 31 has a cylindrical structure, and the axis of the first rotor core 31 is the axis of the first rotor 3. Furthermore, in the motor provided in the embodiments of this application, the axis of the first rotor core 31 coincides with the axis 2O of the stator 2.

[0096] In some examples, the first rotor core 31 can be made by stacking multiple silicon steel sheets along the axial direction of the stator 2, with the multiple silicon steel sheets stacked in a cylindrical structure to form the first rotor core 31. The thickness of the silicon steel sheets forming the first rotor core 31 in the axial direction of the first rotor core 31 can be the same as or different from the thickness of the silicon steel sheets forming the stator 2, and no limitation is made here.

[0097] Multiple first permanent magnets 32 are evenly distributed along the circumference of the first rotor core 31, and each of the multiple first permanent magnets 32 is fixedly connected to the first rotor core 31. Below are two possible distribution schemes for the first permanent magnets 32.

[0098] Distribution method 1: The first permanent magnet 32 ​​is distributed outside the first rotor core 31.

[0099] In some examples, such as Figure 7 and Figure 8 As shown, multiple first permanent magnets 32 can be located outside the first rotor core 31, and the multiple first permanent magnets 32 are evenly distributed along the circumferential direction of the outer surface of the first rotor core 31. The multiple first permanent magnets 32 are respectively fixedly connected to the outer surface of the first rotor core 31. The first permanent magnets 32 and the first rotor core 31 can be fixedly connected by welding, gluing, or riveting.

[0100] Optionally, the first permanent magnet 32 ​​is detachably connected to the first rotor core 31, so that it can be easily replaced when one of the first permanent magnets 32 is damaged. Alternatively, it can be easily replaced when the first rotor core 31 is damaged.

[0101] Distribution Method Two: The first permanent magnet 32 ​​is distributed in the first rotor core 31.

[0102] Figure 10This is a schematic diagram of a rotor structure provided in an embodiment of this application. Figure 11 This is a side view of a first rotor provided in an embodiment of this application.

[0103] refer to Figure 10 and Figure 11 As shown, the first rotor core 31 has a plurality of first axial through holes 31A. In other words, the first rotor core 31 has a plurality of first axial through holes 31A on one end face, and the first axial through holes 31A penetrate the first rotor core 31. The axis of the inner wall of the first rotor core 31 coincides with the axis of the outer surface of the first rotor core 31, and the plurality of first axial through holes 31A are evenly distributed along the circumferential direction of the outer surface of the first rotor core 31.

[0104] Multiple first permanent magnets 32 are respectively located within multiple first axial through holes 31A, meaning that one first permanent magnet 32 ​​can be located within one first axial through hole 31A. The first permanent magnet 32 ​​is fixedly connected to the inner wall of the first axial through hole 31A. In some examples, the first permanent magnet 32 ​​and the first axial through hole 31A can be an interference fit, in which case the first permanent magnet 32 ​​and the first axial through hole 31A can be fixedly connected without the aid of other structures.

[0105] Optionally, the first permanent magnet 32 ​​and the first axial through hole 31A can be fixed by adhesive bonding. In this case, a layer of adhesive can be applied to both the outer surface of the first permanent magnet 32 ​​and the inner wall of the first axial through hole 31A. Then, the first permanent magnet 32 ​​is inserted into the first axial through hole 31A and left to stand or external force is applied to fix the first permanent magnet 32 ​​and the first axial through hole 31A.

[0106] Below, for the case where the first permanent magnet 32 ​​is distributed in the first rotor core 31, the following three possible structures of the first axial through hole 31A are given.

[0107] Structure 1, spoke shape

[0108] like Figure 11 As shown, for a first axial through hole 31A, the radial length of the first axial through hole 31A on the outer surface of the first permanent magnet 32 ​​is greater than the axial length of the first axial through hole 31A on the outer surface of the first permanent magnet 32. Multiple first axial through holes 31A are evenly distributed along the circumferential direction of the outer surface of the first permanent magnet 32, thus forming a... Figure 11 The spoke-shaped structure shown.

[0109] In some examples, the first permanent magnet 32 has a gap on each of the two sides in the radial direction of the outer surface of the first permanent magnet 32. That is, in the radial direction of the outer surface of the first permanent magnet 32, there is a gap between the first permanent magnet 32 and the inner wall of the first axial through-hole 31A. This gap can achieve magnetic circuit isolation between the first rotor 3 and the stator 2, and prevent the problem that the first rotor 3 cannot work properly due to magnetic circuit crossover between the first rotor 3 and the stator 2.

[0110] Structure Two: Linear

[0111] Figure 13 is a side view of a first rotor provided by an embodiment of the present application. As Figure 13 shown, in a cross-section perpendicular to the axis of the first axial through-hole 31A, the projection of the first axial through-hole 31A is in the shape of a "one", and it can be understood that the length of the first axial through-hole 31A in the radial direction of the outer surface of the first permanent magnet 32 is less than the length of the first axial through-hole 31A in the axial direction of the outer surface of the first permanent magnet 32.

[0112] In some examples, in the length direction of the first axial through-hole 31A, there is a gap between the first permanent magnet 32 and the inner wall of the first axial through-hole 31A. In some other examples, as Figure 11 shown, the first axial through-hole 31A has an extension groove at both ends in its length direction, and the extension groove extends from the first axial through-hole 31A to the outer surface of the first rotor core 31. The extension grooves at both ends of the first axial through-hole 31A play a role in isolating the magnetic circuit, which will not be elaborated here.

[0113] Structure Three: Triangular (△)

[0114] Figure 15 is a side view of a first rotor provided by an embodiment of the present application. In some examples, as Figure 15 shown, the first axial through-hole 31A can be composed of three through-hole segments. The first through-hole segment is close to the outer surface of the first rotor core 31 and can be regarded as the bottom edge of the first axial through-hole 31A. One end of the second through-hole segment and the third through-hole segment is close to the inner wall of the first rotor core 31, and the other end is close to the first through-hole segment. Moreover, the second through-hole segment and the third through-hole segment are connected to each other near the inner wall of the first rotor core 31. The second through-hole segment and the third through-hole segment can be regarded as the two side edges of the first axial through-hole 31A. Thus, the first through-hole segment, the second through-hole segment, and the third through-hole segment form a triangular structure as Figure 15 shown.

[0115] Optionally, the first through-hole segment, the second through-hole segment, and the third through-hole segment can be interconnected in any pair, or they can be disconnected from each other; no limitation is imposed here. The lengths of the first through-hole segment, the second through-hole segment, and the third through-hole segment can all be the same, partially the same, or all different; no limitation is imposed here.

[0116] When the first axial through hole 31A adopts this structure, the first permanent magnet 32 ​​can be distributed in each through hole segment, and in the length direction of each through hole segment, there is a gap between the first permanent magnet 32 ​​and the inner wall of each through hole segment to achieve magnetic circuit isolation.

[0117] Optionally, when the first permanent magnet 32 ​​is distributed in the first rotor core 31, the first axial through hole 31A can also be a trapezoidal through hole, a circular through hole, a rhomboid through hole, etc. Correspondingly, the first permanent magnet 32 ​​can be a trapezoidal structure, a circular structure, a rhomboid structure, etc., that mates with the first axial through hole 31A. No limitations are placed here on the shape and structure of the first permanent magnet 31 and the first axial through hole 31A.

[0118] Second rotor 4

[0119] like Figure 7 As shown, the second rotor 4 includes a second rotor core 41 and a plurality of second permanent magnets 42. The second rotor core 41 has a cylindrical structure, and the axis of the second rotor core 41 is the axis of the second rotor 4. Furthermore, in the motor provided in the embodiments of this application, the axis of the second rotor core 41 coincides with the axis 2O of the stator 2.

[0120] In some examples, the second rotor core 41 can be made by stacking multiple silicon steel sheets along the axial direction of the stator 2, with the multiple silicon steel sheets stacked in a cylindrical structure to form the second rotor core 41. The thickness of the silicon steel sheets forming the second rotor core 41 in the axial direction of the second rotor core 41 can be the same as or different from the thickness of the silicon steel sheets forming the first rotor core 31, and no limitation is made here.

[0121] Figure 9 This is a side view of a second rotor provided in an embodiment of this application. In some examples, reference is made to... Figure 7 and Figure 9 As shown, a plurality of second permanent magnets 42 are located outside the second rotor core 41, and the plurality of second permanent magnets 42 are evenly distributed along the circumferential direction of the outer surface of the second rotor core 41. The plurality of second permanent magnets 42 are fixedly connected to the outer surface of the second rotor core 41. The second permanent magnets 42 and the outer surface of the second rotor core 41 can be fixed by means of welding or gluing, etc., and the connection method between the two is not limited here.

[0122] Figure 12 This is a side view of a second rotor provided in an embodiment of this application. Figure 14 This is a side view of a second rotor provided in an embodiment of this application. Figure 16 This is a side view of a second rotor provided in an embodiment of this application. In other examples, refer to... Figure 12 , Figure 14 and Figure 16 As shown, the second rotor core 41 has multiple second axial through holes 41A. In other words, the second rotor core 41 has multiple second axial through holes 41A on one end face, and the second axial through holes 41A penetrate the first rotor core 31. The axis of the inner wall of the second rotor core 31 coincides with the axis of the outer surface of the second rotor core 41, and the multiple second axial through holes 41A are evenly distributed along the circumferential direction of the outer surface of the second rotor core 41. Multiple second permanent magnets 42 are respectively located in the multiple second axial through holes 41A, that is, each second permanent magnet 42 is located in one second axial through hole 41A, and the second permanent magnet 42 is fixedly connected to the inner wall of the second axial through hole 41A.

[0123] As an example, the second axial through hole 41A can be in the shape of spokes, "I", triangle, semicircle, trapezoid, etc. The structure of the second axial through hole 41A can be the same as or similar to the structure of the first axial through hole 31A, which will not be elaborated here.

[0124] First output shaft 5 and second output shaft 6

[0125] refer to Figure 1 As shown, the first output shaft 5 may include a first shaft segment 51 and a second shaft segment 52 that are fixedly connected, and the second output shaft 6 is a hollow shaft. The first shaft segment 51 and the second shaft segment 52 may be integrally formed, or they may be fixedly connected by welding, keying, or other methods.

[0126] The first shaft segment 51 of the first output shaft 5 is located inside the housing 1, and the first shaft segment 51 is fixedly connected to the inner wall of the first rotor 3. The first shaft segment 51 and the inner wall of the first rotor 3 can be connected by an interference fit, or by a key connection or welding, etc. As an example, Figure 1 The left side of the middle housing 1 may have a support protrusion 1C, which is located inside the housing 1 and protrudes toward the first shaft segment 51 (the support protrusion 1C is arranged opposite to the first shaft segment 51). The end of the first shaft segment 51 near the support protrusion 1C can be rotatably connected to the support protrusion 1C through a bearing, that is, rotatably connected to the housing 1.

[0127] A portion of the second shaft segment 52 of the first output shaft 5 is located within the housing 1, and this portion is also located within the second output shaft 6. Another portion of the second shaft segment 52 protrudes from the end of the second output shaft 6 away from the first shaft segment 51, for connection to external devices. The portion of the second shaft segment 52 located within the second output shaft 6 can be rotatably connected to the inner wall of the second output shaft 6 via a bearing. With this design, the first output shaft 5 can rotate relative to the housing 1 and the second output shaft 6 as the first rotor 3 rotates. Therefore, the motor can independently output power through the first rotor 3 and the first output shaft 5 to drive devices connected to the first output shaft 5.

[0128] One end of the second output shaft 6 is located inside the housing 1, close to the first shaft section 51 of the first output shaft 5, and is fixedly connected to the second rotor 4. The second output shaft 6 and the inner wall of the second rotor 4 can be connected by an interference fit, a key connection, or welding. The other end of the second output shaft 6 protrudes from the housing 1 for connection to external devices. The outer surface of the second output shaft 6 can be rotatably connected to the housing 1 via a bearing, and the inner wall of the second output shaft 6 is rotatably connected to the first output shaft 5. With this design, the second output shaft 6 can rotate relative to the housing 1 and the first output shaft 5 as the second rotor 4 rotates. Therefore, the motor can independently output power through the second rotor 4 and the second output shaft 6 to drive devices connected to the second output shaft 6.

[0129] By adopting this solution, the motor provided in this application embodiment can simultaneously drive the first output shaft 5 and the second output shaft 6 to output power to the outside, or it can drive the first output shaft 5 or the second output shaft 6 to output power to the outside individually, which is beneficial to make the motor suitable for various application scenarios and increase the flexibility of the motor.

[0130] In related technologies, dual-axis motors are typically used as counter-rotating motors, which are motors with two output shafts rotating in different directions. The motor provided in this application embodiment can also be used as a counter-rotating motor, provided the following conditions are met:

[0131] (1) The number of slots Z of stator 2 s The number of phases M of the motor is a positive integer multiple, where Z is the number of slots in stator 2. s This can be considered as the number of stator teeth 22 in stator 2;

[0132] (2) The first pole number Z of the first rotor 3 r1 The second pole number Z of the second rotor 4 r2 All are positive even numbers, among which the first extreme number Z r1 It can be considered as the number of the first permanent magnets 32 in the first rotor 3, and the number of the second poles Z. r2 This can be considered as the number of the second permanent magnets 42 in the second rotor 4;

[0133] (3)Z r1 =k1×Z s -L, Z r2 =k2×Z s +L, Z s ÷M÷GCD(Z s Z r1 ) and Z s ÷M÷GCD(Z s Z r2 All are positive integers, where k1 and k2 are either both positive odd numbers or both are both positive even numbers, L, k1×Z s and k2×Z s All are positive odd numbers or all are positive even numbers, L <Z s GCD(Z) s Z r1 ) is Z s and Z r1 The greatest common divisor of GCD (Z) s Z r2 ) is Z s and Z r2 The greatest common divisor.

[0134] For example, the parameters in the above three conditions can be set as follows: the number of phases of the motor M = 3, and the number of slots in stator 2 Z. s =12, the first pole number Z of the first rotor 3 r1 =10, the second pole number Z of the second rotor 4 r2 =14, k1 and k2 are both 1, L is 2, at this time, Z s and Z r1 The greatest common divisor GCD(Z) s Z r1 Z = 2 s and Z r2 The greatest common divisor GCD(Z) s Z r2 Z = 2 s ÷M÷GCD(Z s Z r1 Z = 2 s ÷M÷GCD(Z s Z r2 =2. Therefore, it can be seen that adopting this value scheme can satisfy the above three conditions. At this time, the motor provided in this application embodiment is a counter-rotating motor, that is, when the first output shaft 5 and the second output shaft 6 work at the same time, the rotation directions are opposite.

[0135] For example, the parameters in the above three conditions can be set as follows: the number of phases of the motor M = 5, and the number of slots in stator 2 Z. s =25, the first pole number Z of the first rotor 3r1 =20, the second pole number Z of the second rotor 4 r2 =30, k1 and k2 are both 1, L is 5, at this time, Z s and Z r1 The greatest common divisor GCD(Z) s Z r1 Z = 5 s and Z r2 The greatest common divisor GCD(Z) s Z r2 Z = 5 s ÷M÷GCD(Z s Z r1 Z = 1 s ÷M÷GCD(Z s Z r2 =1. Therefore, it can be seen that adopting this value scheme can satisfy the above three conditions. At this time, the motor provided in this application embodiment is a counter-rotating motor, that is, when the first output shaft 5 and the second output shaft 6 work at the same time, the rotation directions are opposite.

[0136] Typically, the motor speed n = 60 × f ÷ p, where f is the electrical frequency and p is the number of rotor poles. Therefore, the motor speed n is directly proportional to the electrical frequency f and inversely proportional to the number of rotor poles p. When the first rotor 3 has a first pole number Z... r1 The second pole number Z of the second rotor 4 r2 When the above three conditions are met, the ratio of the rotational speeds of the first rotor 3 to the second rotor 4 is Z. r2 / Z r1 Clearly, based on the three conditions and related examples above, Z... r1 ≠Z r2 Therefore, the first rotor 3 and the second rotor 4 have different speeds, which means that different speed ratios can be achieved by adjusting the number of poles of the two rotors. This is beneficial to meet the applicability of the motor in different scenarios, thereby improving the flexibility of motor use.

[0137] In some examples, although the rotor speeds of the two motors are different, they can be infinitely close under specific stator and rotor pole number combinations. As an example, when Z... r1 and Z r2 Is with Z s A relatively close even number, and Z s When Z is as large as possible r2 / Z r1 When the value approaches 1, the two motor rotors rotate in opposite directions and have approximately the same speed.

[0138] Figure 13 This is a cross-sectional view of a motor provided in an embodiment of this application. For example... Figure 13As shown, the motor may also include a third rotor 7 and a third output shaft 8.

[0139] The third rotor 7 is located inside the stator 2; in other words, the outer surface of the third rotor 7 is opposite to the inner wall of the stator 2. The third rotor 7, the first rotor 3, and the second rotor 4 are spaced apart along the axial direction of the stator 2, and the axis of the third rotor 7 coincides with the axis 2O of the stator 2. As an example, the third rotor 7, the first rotor 3, and the second rotor 4 are equally spaced along the axial direction of the stator 2.

[0140] One end of the third output shaft 8 is located inside the housing 1, and the other end is located outside the housing 1. The portion of the third output shaft 8 located inside the housing 1 is fixedly connected to the third rotor 7. The third output shaft 8 is rotatably connected to the housing 1.

[0141] In some examples, the third output axis 8 can be... Figure 13 The right side, as shown in the diagram, extends out of the housing 1. Both the first output shaft 5 and the second output shaft 6 have... Figure 13 The left side, as shown in the image, extends out of the housing 1.

[0142] In other examples, the third output shaft 8, the first output shaft 5, and the second output shaft 6 are all... Figure 13 The left side extends out of the housing 1 as shown. At this time, the first output shaft 5 can also adopt a hollow shaft structure. A part of the third output shaft 8 can be located inside the first output shaft 5, and the end of the third output shaft 8 away from the third rotor 7 protrudes from the end of the first output shaft 5 away from the first rotor 3.

[0143] Optionally, the motor may include three or more rotors and three or more output shafts. In this case, all rotors are located within the same stator, meaning that the outer surfaces of all rotors are opposite to the inner wall of the stator 2, and all rotors are evenly spaced along the axial direction of the stator 2, with the axes of all rotors coinciding with the axis 2O of the stator 2. Each output shaft is fixedly connected to one rotor and is directly or indirectly rotatably connected to the housing 1. All output shafts may extend out of the housing 1 in the same direction, or a portion of each output shaft may extend out of the housing 1 in a first direction and another portion in a second direction opposite to the first direction. The cases of motors including three or more rotors and three or more output shafts are similar to the cases of two rotors and two output shafts and three rotors and three output shafts provided in the embodiments of this application, and will not be described in detail here.

[0144] In the solution provided in this application embodiment, the motor includes one stator, two rotors, and two output shafts. The two output shafts are fixedly connected to the two rotors respectively, and are used to output power to the outside. Using this solution, the motor has only one stator, reducing the number of stator winding ends, which shortens the axial length of the motor and reduces the amount of stator windings used. Simultaneously, the multiple motor rotors are compactly arranged axially with very small air gaps between them, which not only achieves magnetic isolation between the two motors but also helps to shorten the axial length of the motor.

[0145] The above description is merely an optional embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A single-stator radial flux motor, characterized in that, The motor includes: housing (1), stator (2), first rotor (3), second rotor (4), first output shaft (5), and second output shaft (6); The stator (2) is located inside the housing (1) and is connected to the inner wall of the housing (1); The first rotor (3) and the second rotor (4) are both located inside the stator (2), and the first rotor (3) and the second rotor (4) are spaced apart along the axial direction of the stator (2), and the axis of the first rotor (3) and the axis of the second rotor (4) coincide with the axis (2O) of the stator (2); The first output shaft (5) is fixedly connected to the first rotor (3), the second output shaft (6) is fixedly connected to the second rotor (4), and the first output shaft (5) and the second output shaft (6) are respectively rotatably connected to the housing (1); The number of slots in the stator (2) Z s The first number of poles of the first rotor (3) is a positive integer multiple of the number of phases M of the motor. Z r1 and the second pole number of the second rotor (4) Z r2 All are positive even numbers, and Z r1 =k1×Z s -L, Z r2 =k2×Z s +L, Z s ÷M÷GCD(Z s Z r1 ) and Z s ÷M÷GCD(Z s Z r2 All are positive integers, where k1 and k2 are either both positive odd numbers or both are both positive even numbers, L, k1×Z s and k2×Z s All are positive odd numbers or all are positive even numbers, L <Z s GCD (Z) s Z r1 ) is Z s and Z r1 The greatest common divisor of GCD (Z) s Z r2 ) is Z s and Z r2 The greatest common divisor.

2. The single-stator radial flux motor according to claim 1, characterized in that, The stator (2) includes: a stator yoke (21), multiple stator teeth (22), multiple stator pole shoes (23), and multiple stator windings (24); The stator yoke (21) has a cylindrical structure; The stator teeth (22) have a strip-shaped structure. The plurality of stator teeth (22) are located inside the stator yoke (21) and are evenly distributed along the circumferential direction of the inner wall of the stator yoke (21). They are connected to the inner wall of the stator yoke (21) respectively. The plurality of stator teeth (22) are not connected to each other. The plurality of stator pole shoes (23) are located at one end of the plurality of stator teeth (22) near the axis of the stator yoke (21) and are connected to the stator teeth (22). The plurality of stator pole shoes (23) are not connected to each other. Each of the stator windings (24) is wound on at least one of the stator teeth (22) and is located between the stator yoke (21) and the stator pole shoe (23).

3. The single-stator radial flux motor according to claim 2, characterized in that, Each of the stator windings (24) is wound around one of the stator teeth (22).

4. The single-stator radial flux motor according to claim 2, characterized in that, The stator yoke (21), the stator teeth (22), and the stator pole shoes (23) are all made by axially stacking multiple silicon steel sheets along the axis of the stator (2).

5. The single-stator radial flux motor according to claim 1, characterized in that, The first output shaft (5) includes a first shaft segment (51) and a second shaft segment (52) that are fixedly connected, and the second output shaft (6) is a hollow shaft; The first shaft segment (51) is fixedly connected to the first rotor (3) and rotatably connected to the housing (1). A portion of the second shaft segment (52) is located inside the second output shaft (6), and another portion of the second shaft segment (52) protrudes from the end of the second output shaft (6) away from the first shaft segment (51). The second shaft segment (52) is rotatably connected to the second output shaft (6). One end of the second output shaft (6) is fixedly connected to the second rotor (4), and the other end protrudes from the housing (1). The second output shaft (6) is rotatably connected to the housing (1).

6. The single-stator radial flux motor according to any one of claims 1-5, characterized in that, The first rotor (3) includes a first rotor core (31) and a plurality of first permanent magnets (32); The first rotor core (31) has a cylindrical structure; The plurality of first permanent magnets (32) are located outside the first rotor core (31) and are evenly distributed along the circumferential direction of the outer surface of the first rotor core (31), and are respectively fixedly connected to the outer surface of the first rotor core (31).

7. The single-stator radial flux motor according to any one of claims 1-5, characterized in that, The first rotor (3) includes a first rotor core (31) and a plurality of first permanent magnets (32); The first rotor core (31) has a cylindrical structure and a plurality of first axial through holes (31A). The plurality of first axial through holes (31A) are evenly distributed along the circumferential direction of the outer surface of the first rotor core (31). The plurality of first permanent magnets (32) are respectively located in the plurality of first axial through holes (31A) and are fixedly connected to the inner wall of the first axial through holes (31A).

8. The single-stator radial flux motor according to any one of claims 1-5, characterized in that, The second rotor (4) includes a second rotor core (41) and a plurality of second permanent magnets (42). The second rotor core (41) has a cylindrical structure; The plurality of second permanent magnets (42) are located outside the second rotor core (41) and are evenly distributed along the circumferential direction of the outer surface of the second rotor core (41), and are respectively fixedly connected to the outer surface of the second rotor core (41).

9. The single-stator radial flux motor according to any one of claims 1-5, characterized in that, The second rotor (4) includes a second rotor core (41) and a plurality of second permanent magnets (42). The second rotor core (41) has a cylindrical structure and a plurality of second axial through holes (41A). The plurality of second axial through holes (41A) are evenly distributed along the circumferential direction of the outer surface of the second rotor core (41). The plurality of second permanent magnets (42) are respectively located in the plurality of second axial through holes (41A) and are fixedly connected to the inner wall of the second axial through holes (41A).

10. The single-stator radial flux motor according to any one of claims 1-5, characterized in that, The motor also includes: a third rotor (7) and a third output shaft (8); The third rotor (7) is located inside the stator (2), and the first rotor (3), the second rotor (4) and the third rotor (7) are distributed at intervals along the axial direction of the stator (2), and the axis of the third rotor (7) coincides with the axis (2O) of the stator (2); The third output shaft (8) is fixedly connected to the third rotor (7) and rotatably connected to the housing (1).

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