Electric machines and electric appliances

Abstract

This invention proposes an electric motor and electrical device. The motor includes: a first stator comprising multiple first teeth and multiple first slots, wherein the tooth tip width of the first teeth is a1 and the slot opening width of the first slots is a2; a second stator comprising multiple second teeth, with a second slot between adjacent second teeth, wherein the tooth tip width of the second teeth is b1 and the slot opening width of the second slots is b2; and a rotor comprising multiple permanent magnets and multiple magnetic shielding parts, wherein the width of the permanent magnets facing the first stator is c1, the width of the magnetic shielding parts facing the first stator is c2, the width of the permanent magnets facing the second stator is d1, and the width of the magnetic shielding parts facing the second stator is d2. By limiting the relevant dimensions in the motor, the torque density of the motor during operation can be effectively increased, thereby effectively increasing the motor torque. Furthermore, the torque ripple and cogging torque of the motor can be significantly reduced, thus improving the stability of the motor.

Description

Technical Field

[0001] This invention relates to the field of motor technology, and more specifically, to a motor and electrical equipment. Background Technology

[0002] In related technologies, dual-stator motors are being used more and more. However, effectively improving the torque density of the motor during operation and reducing the torque pulsation and cogging torque to improve the stability of motor operation has become an urgent problem to be solved. Summary of the Invention

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

[0004] Therefore, the first aspect of the present invention provides an electric motor.

[0005] A second aspect of the present invention provides an electrical device.

[0006] A first aspect of the present invention provides an electric motor, comprising: a first stator, the first stator including a plurality of first teeth and a plurality of first slots, the tooth tip width of the first teeth being a1 and the slot opening width of the first slots being a2; a second stator disposed inside the first stator, the second stator including a plurality of second teeth, a second slot being formed between adjacent second teeth, the tooth tip width of the second teeth being b1 and the slot opening width of the second slots being b2; and a rotor disposed between the first stator and the second stator, the rotor including a plurality of alternately arranged permanent magnets and magnetic shielding portions, the width of the permanent magnets facing the first stator being c1, the width of the magnetic shielding portions facing the first stator being c2, the width of the permanent magnets facing the second stator being d1, and the width of the magnetic shielding portions facing the second stator being d2; wherein the electric motor satisfies at least one of the following:

[0007] Among the plurality of a1 and the plurality of a2, there is one value of a first value L1, and among the plurality of c1 and the plurality of c2, there is one value of a second value L2, satisfying |L1-L2|÷L1≤0.15 or |L1-L2|÷L2≤0.15;

[0008] Among the plurality of b1 and the plurality of b2, there is one value of a third value L3, and among the plurality of d1 and the plurality of d2, there is one value of a fourth value L4, satisfying |L3-L4|÷L3≤0.15 or |L3-L4|÷L4≤0.15.

[0009] The motor proposed in this invention includes a first stator and a second stator, which are coaxially arranged, with the second stator located inside the first stator. A rotor is placed between the first and second stators, and the rotor is coaxially arranged with both the first and second stators. The motor provided by this invention can effectively improve the power density during motor operation, enhance the power distribution performance of the motor, and significantly improve the torque density during motor operation, thereby significantly improving the motor torque and ensuring the motor's requirements for high-speed and high-torque operation. Compared with related technologies, while ensuring motor performance, it can also effectively reduce the radial volume of the motor, which is beneficial for miniaturized motor design.

[0010] Specifically, the first stator may include a plurality of first teeth, which are arranged in a ring to form a ring-shaped first stator. Further, there is a first groove between adjacent first teeth. Correspondingly, the second stator may include a plurality of second teeth, which are arranged in a ring. The diameter of the ring formed by the arrangement of the second teeth is smaller than the diameter of the ring formed by the arrangement of the first teeth, so that the second stator can be fitted inside the first stator and a gap space is formed between the first stator and the second stator.

[0011] Furthermore, the motor also includes a rotor, which comprises multiple permanent magnets and multiple magnetic shielding parts, with the number of permanent magnets and magnetic shielding parts being the same. Further, the multiple permanent magnets and multiple magnetic shielding parts are arranged alternately in a ring, allowing the rotor assembly to be concentrically positioned with the first and second stators. The diameter of the rotor assembly can be set to be larger than the diameter of the first stator and smaller than the diameter of the second stator, thus ensuring that the rotor assembly can be fitted between the first and second stators. Through the alternating arrangement of multiple permanent magnets and multiple magnetic shielding parts, the magnetic field of the permanent magnets can effectively form a magnetic field loop between the stator and the rotor, thereby ensuring effective coordination between the windings and the magnetic field of the permanent magnets to guarantee the motor's operating performance.

[0012] Further, the tooth tip width of the first tooth is a1, and the slot opening width of the first groove is a2; the tooth tip width of the second tooth is b1, and the slot opening width of the second groove is b2; the width of the end of the permanent magnet facing the first stator is c1, the width of the magnetic shielding part facing the first stator is c2, the width of the end of the permanent magnet facing the second stator is d1, and the width of the end of the magnetic shielding part facing the second stator is d2. Furthermore, the motor satisfies at least one of the following:

[0013] Among multiple a1 and multiple a2, there exists one with a value of the first value L1, and among multiple c1 and multiple c2, there exists one with a value of the second value L2, satisfying |L1-L2|÷L1≤0.15 or |L1-L2|÷L2≤0.15;

[0014] There exists a value L3 among multiple b1 and multiple b2, and there exists a value L4 among multiple d1 and multiple d2, satisfying |L3-L4|÷L3≤0.15 or |L3-L4|÷L4≤0.15.

[0015] Specifically, the motor provided by the present invention can also simultaneously meet the above conditions.

[0016] The motor provided by this invention, by radially arranging a first stator and a second stator to form a radial double-stator structure, allows the rotor to be positioned between the first and second stators. This effectively increases the power density during motor operation, enhances the power distribution performance, and reduces the radial volume, facilitating miniaturization. Furthermore, by defining the relationships between relevant dimensions in the first stator and the rotor, and between relevant dimensions in the second stator and the rotor, the torque density during operation can be effectively increased, thereby improving the motor's torque. It also significantly reduces torque ripple and cogging torque, thus enhancing motor stability.

[0017] In addition, the motor in the above-described technical solution provided by the present invention may also have the following additional technical features:

[0018] In the above technical solution, furthermore, the first stator and the rotor also satisfy: |a max -(k1×c1+k2×c2)∣÷a max ≤0.15 or |a max -(k1×c1+k2×c2)∣÷(k1×c1+k2×c2)≤0.15, where a max Let k1 and k2 be the maximum values ​​of the tooth tip width of multiple first teeth and the slot width of multiple first slots, where k1 and k2 are both integers greater than or equal to 1; and / or the second stator and rotor also satisfy: |b max -(k3×d1+k4×d2)∣÷b max ≤0.15 or |b max -(k3×d1+k4×d2)∣÷(k3×d1+k4×d2)≤0.15, where b max k3 and k4 are the maximum values ​​of the tooth tip width of multiple second teeth and the slot width of multiple second slots, where k3 and k4 are both integers greater than or equal to 1.

[0019] In this technical solution, the maximum value among the tooth tip width a1 of the multiple first teeth and the groove width a2 of the multiple first grooves is denoted as a. max a max Satisfy: |a max -(k1×c1+k2×c2)∣÷amax ≤0.15 or |a max -(k1×c1+k2×c2)∣÷(k1×c1+k2×c2)≤0.15. That is, the maximum value a among the tooth tip width a1 of the multiple first teeth and the groove width a2 of the multiple first slots. max The width of the permanent magnet near the first tooth is c1 times k1×c1, and the width of the permanent magnet in the magnetic shielding part near the first tooth is c2 times k2×c2. max The difference between (k1×c1+k2×c2) and a max The ratio of (k1×c1+k2×c2) is less than or equal to 15%.

[0020] Among the tooth tip width b1 of multiple second teeth and the slot width b2 of multiple second slots, the maximum value is denoted as b. max b max Satisfy: |b max -(k3×d1+k4×d2)∣÷b max ≤0.15 or |b max -(k3×d1+k4×d2)∣÷(k3×d1+k4×d2)≤0.15, meaning that there exists a maximum value b among the tooth tip width b1 of multiple second teeth and the groove width b2 of multiple second slots. max The width b1 of the permanent magnet near the second tooth is k3 times, and the width b2 of the magnetic shielding part near the second tooth is k4 times. max The difference between (k3×d1+k4×d2) and b max The ratio of (k3×d1+k4×d2) is less than or equal to 15%.

[0021] Furthermore, the motor provided by the present invention can also simultaneously satisfy the above conditions.

[0022] In other words, the motor of the present invention, by radially arranging a first stator and a second stator to form a radial double-stator structure, thereby allowing the rotor of the motor to be positioned between the first stator and the second stator, effectively improves the power density during motor operation and enhances the power distribution performance of the motor. Furthermore, by defining the relationship between the maximum value of the tooth tip width a1 of multiple first teeth and the slot opening width a2 of multiple first slots and the width values ​​c1 and c2 of the permanent magnet and the magnetic shielding part near the first stator, and defining the relationship between the maximum value of the tooth tip width b1 of multiple second teeth and the slot opening width b2 of multiple second slots 126 and the width values ​​d1 and d2 of the permanent magnet and the magnetic shielding part near the second stator 106, the torque density of the motor during operation is further improved, thereby further increasing the torque of the motor, while further reducing the torque pulsation and cogging torque of the motor, thereby further improving the stability of the motor.

[0023] In any of the above technical solutions, the first stator further includes: a first stator yoke, with first teeth disposed on the inner wall of the first stator yoke, and a first stator groove between two adjacent first teeth; wherein the first groove includes a first stator groove.

[0024] In this technical solution, the first stator may further include a first stator yoke, which may be arranged in a ring shape. Further, multiple first teeth are distributed circumferentially along the inner wall of the first stator yoke, and a first stator groove is formed between two adjacent first teeth. The first groove includes a first stator slot. That is, the width of the first groove opening is the width of the first stator slot between two adjacent first teeth.

[0025] In any of the above technical solutions, the first tooth further includes: a first tooth body connected to the first stator yoke; and a first tooth shoe disposed on the first tooth body, with a slot for the first stator groove between the two first tooth shoes.

[0026] In this technical solution, the first tooth may include a first tooth body and a first tooth shoe, wherein the first tooth body is connected to the first stator yoke, the first tooth shoe is disposed on the first tooth body, and the slot of the first groove is located between the two first tooth shoes.

[0027] By setting the first toothed shoe, more harmonic components are introduced into the air gap magnetic permeability, which significantly improves the performance of the motor.

[0028] In any of the above technical solutions, the first stator further includes: a second stator yoke; a plurality of third teeth, the inner wall of the second stator yoke is provided, a second stator groove is provided between two adjacent third teeth, a plurality of first teeth are provided on the third teeth, and a groove is provided between two adjacent first teeth on the same third tooth, wherein the first groove includes the second stator groove and the groove.

[0029] In this technical solution, the first tooth may specifically include a second stator yoke and a plurality of third teeth disposed on the second stator yoke. Further, the plurality of first teeth are disposed on the third teeth; that is, each third tooth may have at least two first teeth, meaning the plurality of first teeth are arranged in the form of split teeth on the third teeth. At this time, there is a groove between two adjacent first teeth and a second stator groove between two adjacent third teeth. Based on this, the plurality of first grooves on the first stator include both grooves and second stator grooves.

[0030] In other words, when the multiple first teeth of the first stator are arranged in the form of split teeth on the third teeth, the opening of the first slot includes the width of the second stator slot between two adjacent third teeth and the groove width between two adjacent first teeth. At this time, the width value a2 of the first slot includes the width a3 of the second stator slot and the groove width value a4.

[0031] In other words, the motor satisfies at least one of the following:

[0032] Among multiple a1, multiple a3, and multiple a4, there exists one with a value of the first value L1; among multiple c1 and multiple c2, there exists one with a value of the second value L2, satisfying |L1-L2|÷L1≤0.15 or |L1-L2|÷L2≤0.15.

[0033] There exists a value L3 among multiple b1 and multiple b2, and there exists a value L4 among multiple d1 and multiple d2, satisfying |L3-L4|÷L3≤0.15 or |L3-L4|÷L4≤0.15.

[0034] In any of the above technical solutions, the third tooth further includes: a second tooth body connected to the second stator yoke; and a second tooth shoe disposed on the second tooth body, with a slot for the second stator groove between the two second tooth shoes.

[0035] In this technical solution, the third tooth may include a second tooth body and a second tooth shoe, wherein the second tooth body is connected to the second stator yoke, the second tooth shoe is disposed on the second tooth body, and the second stator slot is located between two adjacent second tooth shoes.

[0036] By setting the second toothed shoe, more harmonic components are introduced into the air gap magnetic permeability, which significantly improves the performance of the motor.

[0037] In any of the above technical solutions, further, in the radial direction of the motor, the angle between the center line of the first slot and the center line of the second tooth is less than or equal to 45 / Ns degrees, where Ns is the number of the first slots.

[0038] In this technical solution, a first slot is formed between two adjacent first teeth. In the radial direction of the first stator, the first slot has a slot centerline. In the radial direction of the second stator, the second tooth has a tooth body centerline. Furthermore, along the rotation direction of the rotor, the angle between the slot centerline of the first slot and the centerline of the second tooth is less than or equal to 45 / Ns degrees, where Ns is the number of first slots. This ensures the distribution of the magnetic field during motor operation, thereby guaranteeing stable motor operation.

[0039] The motor of the present invention, by radially arranging a first stator and a second stator to form a radial double-stator structure, thereby placing the rotor of the motor between the first stator and the second stator, effectively improves the power density during motor operation and enhances the power distribution performance of the motor. Furthermore, by limiting the angle between the first stator and the second stator, the magnetic flux density in the first stator, the second stator, and the rotor can be effectively improved during motor operation, thereby effectively reducing motor losses and improving motor operating efficiency.

[0040] In any of the above technical solutions, further, there is a first air gap between the first stator and the rotor; and there is a second air gap between the second stator and the rotor.

[0041] In this technical solution, the arrangement of the first and second stators effectively improves the power density and power distribution performance of the motor during operation, and significantly increases the torque density, thereby significantly improving the motor's torque and ensuring the motor's high-speed and high-torque operation requirements. Furthermore, a first air gap is formed between the first stator and the rotor, and a second air gap is formed between the second stator and the rotor, thus realizing a dual-air gap structure for the motor. This improves the waveform of the air gap magnetic field between the stator and rotor during motor operation, making the magnetic field formed by the rotor's permanent magnets in the air gap closer to a sinusoidal shape, thereby reducing the motor's cogging torque and torque ripple.

[0042] In any of the above technical solutions, the motor further includes a winding, which is disposed on at least one of the first stator and the second stator.

[0043] In this technical solution, by setting the windings, the first or second stator can cooperate with the permanent magnets on the rotor to ensure stable output of motor torque and speed, and ensure motor operating efficiency.

[0044] Specifically, the first stator includes a first stator yoke, and the first tooth includes a first tooth body and a first tooth shoe. Each winding can be disposed on one first tooth body. Correspondingly, when windings are disposed on the second stator, each winding can be disposed on one second tooth. In other words, by distributing the windings in a concentrated manner, the winding process can be simplified while ensuring that the air gap magnetic field has sufficient sinusoidality during motor operation, thereby reducing the manufacturing difficulty and cost of the motor.

[0045] Furthermore, each winding can be simultaneously located on two adjacent first teeth.

[0046] In any of the above technical solutions, furthermore, the magnetic poles of two adjacent permanent magnets are opposite.

[0047] In this technical solution, by setting the magnetic poles of two adjacent permanent magnets to opposite directions, the two adjacent permanent magnets can form an effective magnetic focusing effect, thereby further improving the air gap magnetic flux density between the first stator and the second stator and the rotor assembly of the motor, which can effectively improve the motor torque, reduce torque fluctuation, and improve the motor stability.

[0048] In any of the above technical solutions, the magnetic shielding part further includes a magnetically conductive component and / or a non-magnetically conductive component.

[0049] In this technical solution, the magnetic isolation portion between adjacent permanent magnets can be configured as a magnetic conductive component. Specifically, the rotor assembly may include a toroidal iron core with mounting slots for mounting permanent magnets spaced apart on the core. A magnetic bridge is formed between the mounting slots using the core body; this magnetic bridge serves as the magnetic isolation portion, thereby achieving spacing between adjacent permanent magnets. Through this configuration, the rotor core's body structure can be utilized to simplify the rotor assembly's processing technology, reduce processing difficulty, and thus lower the motor's manufacturing cost.

[0050] Furthermore, the magnetic shielding section may also include non-magnetic components, which can effectively prevent magnetic leakage in the rotor assembly, thereby improving the magnetic flux density during motor operation and ensuring the motor's operating performance.

[0051] In any of the above technical solutions, the permanent magnet is further comprised of ferrite or rare earth permanent magnet.

[0052] In this technical solution, ferrite or rare earth permanent magnets have good magnetic properties. By using ferrite or rare earth permanent magnets as permanent magnets in the rotor assembly, it can be ensured that the permanent magnets can provide magnetic energy effectively for a long time, thereby ensuring the long-term stable operation of the motor.

[0053] In any of the above technical solutions, the number of pole pairs of the winding further satisfies the following relationship: Pa=∣Ns±Zr / 2∣; where Pa is the number of pole pairs of the winding, Ns is the number of the first slot, and Zr is the number of the magnetic isolation section.

[0054] In this technical solution, the normal operation of the motor is ensured by limiting the number of pole pairs in the windings. Furthermore, new harmonic components appearing in the air gap magnetic flux density can serve as operating harmonics for the motor, providing output torque and effectively improving the motor's torque density. Specifically, the number of pole pairs in the motor windings satisfies the following relationship: Pa=|Ns±Zr / 2|; where Pa is the number of pole pairs in the motor windings, Ns is the total number of the first slot, and Zr is the number of magnetically shielding sections.

[0055] According to a second aspect of the present invention, an electrical device is provided, comprising a motor according to any of the above-described technical solutions.

[0056] The electrical equipment provided by this invention includes a motor from any of the above-mentioned technical solutions, and therefore has all the beneficial effects of that motor, which will not be elaborated here.

[0057] 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

[0058] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0059] Figure 1 A schematic diagram of the structure of a motor provided in one embodiment of the present invention is shown;

[0060] Figure 2 It shows Figure 1 Schematic diagrams of the first and second stators;

[0061] Figure 3 It shows Figure 1 Schematic diagram of the middle rotor;

[0062] Figure 4 A schematic diagram of the structure of the first stator in an electric motor provided in another embodiment of the present invention is shown;

[0063] Figure 5 A schematic diagram of the structure of a motor provided in yet another embodiment of the present invention is shown;

[0064] Figure 6 A schematic diagram of the structure of a motor provided in yet another embodiment of the present invention is shown;

[0065] Figure 7A schematic diagram of the structure of a motor provided in yet another embodiment of the present invention is shown;

[0066] Figure 8 A schematic diagram of the structure of a motor provided in yet another embodiment of the present invention is shown;

[0067] Figure 9 A schematic diagram of the structure of a motor provided in yet another embodiment of the present invention is shown;

[0068] Figure 10 A schematic diagram of the structure of a motor provided in another embodiment of the present invention is shown.

[0069] in, Figures 1 to 10 The correspondence between the reference numerals and components in the attached drawings is as follows:

[0070] 100 Motor, 102 First stator, 104 First tooth, 106 Second stator, 108 Second tooth, 110 Rotor, 112 Permanent magnet, 114 Magnetic shielding part, 116 First stator yoke, 118 First tooth body, 120 First tooth shoe, 122 Winding, 124 First slot, 126 Second slot, 130 Second stator yoke, 132 Third tooth, 134 Second stator slot, 136 Second tooth body, 138 Second tooth shoe, 140 Groove, 142 Third stator yoke, 144 First air gap, 146 Second air gap. Detailed Implementation

[0071] To better understand the above-mentioned objectives, features, and advantages of the present invention, 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.

[0072] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and therefore the scope of protection of the invention is not limited to the specific embodiments disclosed below.

[0073] The following reference Figures 1 to 10 This describes a motor 100 and electrical equipment provided according to some embodiments of the present invention.

[0074] One embodiment of the present invention provides a motor 100, such as Figure 1 , Figure 2 and Figure 3As shown, it includes: a first stator 102, which includes a plurality of first teeth 104 and a plurality of first slots 124; a second stator 106, which is disposed inside the first stator 102, which includes a plurality of second teeth 108 arranged in a ring and a second slot 126 between adjacent second teeth 108; and a rotor 110, which is disposed between the first stator 102 and the second stator 106, which includes a plurality of permanent magnets 112 and a plurality of magnetic shielding parts 114 arranged alternately.

[0075] The motor 100 proposed in this invention includes a first stator 102 and a second stator 106, which are coaxially arranged, with the first stator 102 located outside the second stator 106. Furthermore, a rotor 110 is placed between the first stator 102 and the second stator 106, and the rotor 110 is coaxially arranged with both the first stator 102 and the second stator 106. The motor proposed in this invention can effectively improve the power density of the motor 100 during operation, enhance the power distribution performance of the motor 100, and significantly improve the torque density of the motor 100 during operation, thereby significantly improving the torque of the motor 100 and ensuring the high-speed and high-torque operation requirements of the motor 100. Compared with related technologies, while ensuring the performance of the motor 100, it can also effectively reduce the radial volume of the motor 100, which is beneficial for the miniaturization design of the motor 100.

[0076] Specifically, the first stator 102 may include a plurality of first teeth 104, which are arranged in a ring. Further, a first groove 124 is provided between adjacent first teeth 104. Correspondingly, the second stator 106 may include a plurality of second teeth 108, which are arranged in a ring. The second stator 106 is disposed inside the first stator 102 and a gap space is formed between the first stator 102 and the second stator 106.

[0077] Furthermore, such as Figure 3 As shown, the motor 100 also includes a rotor 110, which includes a plurality of permanent magnets 112 and a plurality of magnetically shielding parts 114, wherein the number of permanent magnets 112 and the number of magnetically shielding parts 114 are the same. Furthermore, as... Figure 1 and Figure 3As indicated by the middle arrow, the magnetization directions of two adjacent permanent magnets 112 are opposite. Furthermore, multiple permanent magnets 112 and multiple magnetic shielding parts 114 are alternately arranged to form a ring, allowing the rotor 110 to be concentrically positioned with the first stator 102 and the second stator 106, wherein the rotor 110 can be fitted between the first stator 102 and the second stator 106. Through the alternating arrangement of multiple permanent magnets 112 and multiple magnetic shielding parts 114, the magnetic field of the permanent magnets 112 can effectively form a magnetic field loop between the first stator 102, the second stator 106, and the rotor 110, thereby ensuring effective coordination between the winding 122 and the magnetic field of the permanent magnets 112, thus guaranteeing the operational performance of the motor 100.

[0078] Further, the tooth tip width of the first tooth 104 is a1, and the slot opening width of the first groove 124 is a2; the tooth tip width of the second tooth 108 is b1, and the slot opening width of the second groove 126 is b2; the width of the end of the permanent magnet 112 facing the first stator 102 is c1, the width of the end of the magnetic shielding part 114 facing the first stator 102 is c2, the width of the end of the permanent magnet 112 facing the second stator 106 is d1, and the width of the end of the magnetic shielding part 114 facing the second stator 106 is d2. Furthermore, the motor 100 satisfies at least one of the following:

[0079] Among multiple a1 and multiple a2, there exists one with a value of the first value L1, and among multiple c1 and multiple c2, there exists one with a value of the second value L2, satisfying |L1-L2|÷L1≤0.15 or |L1-L2|÷L2≤0.15;

[0080] There exists a value L3 among multiple b1 and multiple b2, and there exists a value L4 among multiple d1 and multiple d2, satisfying |L3-L4|÷L3≤0.15 or |L3-L4|÷L4≤0.15.

[0081] Specifically, motor 100 can satisfy at least one of the following conditions:

[0082] The first value L1 is one of the tooth tip width values ​​a1 of the plurality of first teeth 104, and the second value L2 is one of the width values ​​c1 of the plurality of permanent magnets 112 facing the first stator 102. That is, there exists an a1 and a c1 that satisfy: |a1-c1| ÷ a1 ≤ 0.15, or |a1-c1| ÷ c1 ≤ 0.15. Further, a1 and c1 can satisfy: |a1-c1| ÷ a1 ≤ 0.1, or |a1-c1| ÷ c1 ≤ 0.1.

[0083] The first value L1 is one of the tooth tip width values ​​a1 of the plurality of first teeth 104, and the second value L2 is one of the width values ​​c2 of the plurality of magnetic shielding parts 114 facing the first stator 102. That is, there exists an a1 and a c2 that satisfy: |a1-c2| ÷ a1 ≤ 0.15, or |a1-c2| ÷ c2 ≤ 0.15. Further, a1 and c2 can satisfy: |a1-c2| ÷ a1 ≤ 0.1, or |a1-c2| ÷ c2 ≤ 0.1.

[0084] The first value L1 is one of the slot width values ​​a2 of the plurality of first slots 124, and the second value L2 is one of the width values ​​c1 of the ends of the plurality of permanent magnets 112 facing the first stator 102. That is, there exists an a2 and a c1 that satisfy: |a2-c1| ÷ a2 ≤ 0.15, or |a2-c1| ÷ c1 ≤ 0.15. Further, a2 and c1 can satisfy: |a2-c1| ÷ a2 ≤ 0.1, or |a2-c1| ÷ c1 ≤ 0.1.

[0085] The first value L1 is one of the slot width values ​​a2 of the plurality of first slots 124, and the second value L2 is one of the width values ​​c2 of the ends of the plurality of magnetic shielding parts 114 facing the first stator 102. That is, there exists an a2 and a c2 that satisfy: |a2-c2| ÷ a2 ≤ 0.15, or |a2-c2| ÷ c1 ≤ 0.15. Further, a2 and c2 can satisfy: |a2-c2| ÷ a2 ≤ 0.1, or |a2-c2| ÷ c1 ≤ 0.1.

[0086] The third value L3 is one of the tooth tip width values ​​b1 of the multiple second teeth 108, and the fourth value L4 is one of the width values ​​d1 of the multiple permanent magnets 112 facing the second stator 106. That is, there exists a b1 and a d1 that satisfy: |b1-d1| ÷ b1 ≤ 0.15, or |b1-d1| ÷ d1 ≤ 0.15. Furthermore, b1 and d1 can satisfy: |b1-d1| ÷ b1 ≤ 0.1, or |b1-d1| ÷ d1 ≤ 0.1.

[0087] The third value L3 is one of the tooth tip width values ​​b1 of the plurality of second teeth 108, and the fourth value L4 is one of the width values ​​d2 of the plurality of magnetic shielding parts 114 facing the second stator 106. That is, there exists a b1 and a d2 that satisfy: |b1-d2| ÷ b1 ≤ 0.15, or |b1-d2| ÷ d2 ≤ 0.15. Furthermore, b1 and d2 can satisfy: |b1-d2| ÷ b1 ≤ 0.1, or |b1-d2| ÷ d2 ≤ 0.1.

[0088] The third value L3 is one of the slot width values ​​b2 of the plurality of second slots 126, and the fourth value L4 is one of the width values ​​d1 of the ends of the plurality of permanent magnets 112 facing the second stator 106. That is, there exists a b2 and a d1 that satisfy: |b2-d1| ÷ b2 ≤ 0.15, or |b2-d1| ÷ d1 ≤ 0.15. Furthermore, b2 and d1 can satisfy: |b2-d1| ÷ b2 ≤ 0.1, or |b2-d1| ÷ d1 ≤ 0.1.

[0089] The third value L3 is one of the slot width values ​​b2 of the plurality of second slots 126, and the fourth value L4 is one of the width values ​​d2 of the ends of the plurality of magnetic shielding parts 114 facing the second stator 106. That is, there exists a b2 and a d2 that satisfy: |b2-d2|÷b2≤0.15, or |b2-d2|÷d2≤0.15. Further, b2 and d2 can satisfy: |b2-d2|÷b2≤0.1, or |b2-d2|÷d2≤0.1.

[0090] The motor 100 provided by this invention, by radially arranging a first stator 102 and a second stator 106, allows the rotor 110 of the motor 100 to be positioned between the first stator 102 and the second stator 106. This effectively improves the power density of the motor 100 during operation, enhances the power distribution performance of the motor 100, and effectively reduces the radial volume of the motor 100, which is beneficial for the miniaturization design of the motor 100. Furthermore, by defining the relationship between the relevant dimensions in the first stator 102 and the relevant dimensions of the rotor 110, and by defining the relationship between the relevant dimensions in the second stator 106 and the relevant dimensions of the rotor 110, the torque density of the motor 100 during operation can be effectively improved, thereby effectively increasing the torque of the motor 100. It also significantly reduces the torque pulsation and cogging torque of the motor 100, thereby improving the stability of the motor 100.

[0091] Specifically, as shown in Table 1, in Schemes 1, 2, and 3, the tooth tip width b1 of the second tooth 108 is 1.86, and the width d1 of the end of the permanent magnet 112 facing the second stator 106 is 2.05. |b1-d1| ÷ b1 = 0.09, |b1-d1| ÷ d1 = 0.1. It can be seen that the ratio of the difference between b1 and d1 to either b1 or d1 is less than or equal to 10%. At this time, the cogging torque is 4... mNm, 14mNm and 6mNm; In Scheme 4, the tooth tip width value a1 of the first tooth 104 is 4.2, and the width value c2 of the end of the magnetic shielding part 114 facing the first stator 102 is 4.28. |a1-c2|÷a1=0.02, |a1-c2|÷c2=0.02. It can be seen that the ratio of the difference between a1 and c2 to a1 or c2 is less than or equal to 10%, and the tooth cogging torque is 29mNm. In Scheme 5, the tooth tip width a1 of the first tooth 104 is 3, and the width c1 of the end of the permanent magnet 112 facing the first stator 102 is 3.4. |a1-c1|÷a1=0.13, |a1-c1|÷c1=0.12. It can be seen that the difference between a1 and c1 is less than 15% of the ratio of a1 or c1. At this time, the tooth cogging torque is 40mNm.

[0092] As can be seen from the above data, by setting the ratio of the difference between the relevant dimensions in the first stator 102 and the relevant dimensions of the rotor 110 to the relevant dimensions of the first stator 102 or the rotor 110 to less than or equal to 15%, or by setting the ratio of the difference between the relevant dimensions in the second stator 106 and the relevant dimensions of the rotor 110 to the relevant dimensions of the second stator 106 or the rotor 110 to less than or equal to 15%, the cogging torque during the operation of the motor 100 can be effectively suppressed, excessive cogging torque can be avoided, and the stability of the motor can be improved. Furthermore, as can be seen from the data in Schemes 1 to 4 above, by setting the ratio of the difference between b1 and d1 to b1 or d1 to less than or equal to 10%, or the ratio of the difference between a1 and c2 to a1 or c2 to less than or equal to 10%, that is, by setting the ratio of the difference between the relevant dimensions in the first stator 102 and the relevant dimensions of the rotor 110 to less than or equal to 10%, or the ratio of the difference between the relevant dimensions in the second stator 106 and the relevant dimensions of the rotor 110 to less than or equal to 10%, the cogging torque of the motor 100 can be further reduced, thereby further improving the stability of the motor.

[0093] Table 1

[0094]

[0095]

[0096] Based on any of the above embodiments, further, such as Figure 2 and Figure 3 As shown, the first stator 102 and the rotor 110 also satisfy: |a max -(k1×c1+k2×d1)∣÷a max ≤0.15, or |a max -(k1×c1+k2×c2)∣÷(k1×c1+k2×c2)≤0.15, where a max The maximum value of the tooth tip width of the plurality of first teeth 104 and the slot width of the plurality of first slots 124, where k1 and k2 are both integers greater than or equal to 1; and / or the second stator 106 and the rotor 110 also satisfy: |b max -(k3×d1+k4×d2)∣÷b max ≤0.15, or |b max -(k3×d1+k4×d2)∣÷(k3×d1+k4×d2)≤0.15, where b max k3 and k4 are the maximum values ​​of the tooth tip width of multiple second teeth 108 and the slot width of multiple second grooves 126, respectively, where k3 and k4 are both integers greater than or equal to 1.

[0097] In this embodiment, among the tooth tip width value a1 of the plurality of first teeth 104 and the slot width value a2 of the plurality of first slots 124, the maximum value is denoted as a. max a max Satisfy: |a max -(k1×c1+k2×d1)∣÷a max ≤0.15 or |a max -(k1×c1+k2×c2)∣÷(k1×c1+k2×c2)≤0.15. That is, a max The difference between (k1×c1+k2×c2) and a max The ratio of (k1×c1+k2×c2) is less than or equal to 15%, specifically, a max The difference between (k1×c1+k2×c2) and a max The ratio of (k1×c1+k2×c2) can be set to less than or equal to 10%.

[0098] Furthermore, regarding a max Regarding the value of a, it should be noted that the first stator 102 includes multiple first teeth 104 and multiple first slots 124. Each first tooth 104 has a tooth tip width value a1, and each first slot 124 has a slot opening width value a2. At this time, the multiple tooth tip width values ​​a1 and the multiple slot opening width values ​​a2 can form a first set. The a value defined in this invention... maxIt is the largest value in the first set.

[0099] Furthermore, among the tooth tip width value b1 of the plurality of second teeth 108 and the slot width value b2 of the plurality of second slots 126, the maximum value is denoted as b. max b max Satisfy: |b max -(k3×d1+k4×d2)∣÷b max ≤0.15 or |b max -(k3×d1+k4×d2)∣÷(k3×d1+k4×d2)≤0.15, that is, b max The difference between (k3×d1+k4×d2) and b max Or the ratio of (k3×d1+k4×d2) is less than or equal to 15%, specifically, b max The difference between (k3×d1+k4×d2) and b max The ratio of (k3×d1+k4×d2) can be set to less than or equal to 10%.

[0100] Furthermore, regarding b max Regarding the value of b, it should be noted that the second stator 106 includes multiple second teeth 108 and multiple second slots 126. Each second tooth 108 has a tooth tip width value b1, and each second slot 126 has a slot opening width value b2. In this case, the multiple tooth tip width values ​​b1 and the multiple slot opening width values ​​b2 can form a second set. The b value defined in this invention... max It is the largest value in the second set.

[0101] Furthermore, the motor 100 provided by the present invention can also simultaneously satisfy: |a max -(k1×c1+k2×d1)∣÷a max ≤axc or |a max -(k1×c1+k2×c2)∣÷(k1×c1+k2×c2)≤0.1. And |b max -(k3×d1+k4×d2)∣÷b max ≤axd or |b max -(k3×d1+k4×d2)∣÷(k3×d1+k4×d2)≤0.1.

[0102] In other words, the motor 100 of the present invention, by radially arranging a first stator 102 and a second stator 106 to form a radial double-stator structure, thereby allowing the rotor 110 of the motor 100 to be positioned between the first stator 102 and the second stator 106, effectively improves the power density during motor 100 operation and enhances the power distribution performance of the motor 100. Furthermore, by limiting the maximum value of the tooth tip width a1 of multiple first teeth 104 and the slot opening width a2 of multiple first slots 124 to the width c1 of the permanent magnet 112 near the first stator 102, it further... The relationship between the width value c2 of the magnetic shielding part 114 near the first stator 102 and the maximum value of the tooth tip width value b1 of the plurality of second teeth 108 and the slot width value b2 of the plurality of second slots 126, and the relationship between the width value d1 of the permanent magnet 112 near the second stator 106 and the width value d2 of the magnetic shielding part 114 near the second stator 106, thereby further improving the torque density of the motor 100 during operation, thereby further improving the torque of the motor 100, while further reducing the torque pulsation and cogging torque of the motor 100, thereby further improving the stability of the motor 100.

[0103] In any of the above embodiments, further, as Figure 2 As shown, the first stator 102 further includes: a first stator yoke 116, a first tooth 104 disposed on the inner wall of the first stator yoke 116, and a first stator groove between two adjacent first teeth 104; wherein, the first groove 124 includes the first stator groove.

[0104] In this embodiment, the first stator 102 may further include a first stator yoke 116, which may be arranged in a ring shape. Further, a plurality of first teeth 104 are distributed circumferentially along the inner wall of the first stator yoke 116, and a first stator groove is formed between two adjacent first teeth 104. The first groove 124 includes a first stator slot. That is, the width of the groove opening of the first groove 124 is the width of the first stator slot between two adjacent first teeth 104.

[0105] Furthermore, the first tooth 104 also includes: a first tooth body 118 connected to the first stator yoke 116; and a first tooth shoe 120 disposed on the first tooth body 118, with a slot for the first stator groove between the two first tooth shoes 120.

[0106] Specifically, the first tooth 104 may include a first tooth body 118 and a first tooth shoe 120, wherein the first tooth body 118 is connected to the first stator yoke 116, and the first tooth shoe 120 is disposed on the first tooth body 118. Based on this, the slot of the first groove 124 is located between the two first tooth shoes 120.

[0107] By setting the first toothed shoe 120, more harmonic components are introduced into the air gap magnetic permeability, which significantly improves the performance of the motor 100.

[0108] Specifically, the first tooth body 118 and the first tooth shoe 120 can be detachably connected, and the first tooth body 118 and the first stator yoke 116 can also be detachably connected. That is, the first tooth body 118, the first stator yoke 116, and the first tooth shoe 120 can be configured as a separable, nested assembly structure. With this separable, nested assembly structure between the first tooth body 118, the first tooth shoe 120, and the first stator yoke 116, during the assembly of the first stator 102, the coil can be wound first on the first tooth body 118, then one end of the first tooth body 118 can be connected to the first stator yoke 116, and finally the first tooth shoe 120 can be installed to the other end of the first tooth body 118. This simplifies the winding process during the assembly of the first stator 102, reduces the difficulty of winding, increases the slot fill factor of the winding, improves the output performance of the motor 100, and reduces waste materials.

[0109] Specifically, the first tooth body 118 and the first stator yoke 116 can be connected by a concave-convex structure. That is, a groove or a protrusion is provided at one end of the first tooth body 118, and correspondingly, a protrusion or groove that matches the groove or protrusion is provided at the corresponding position of the first stator yoke 116. Thus, the connection between the first tooth body 118 and the first stator yoke 116 can be achieved through the cooperation of the groove and the protrusion.

[0110] Correspondingly, the first tooth body 118 and the first tooth shoe 120 can also be connected by a concave-convex structure, that is, the first tooth shoe 120 and the first tooth body 118 are connected by mutually cooperating protrusions and grooves, so as to simplify the winding process.

[0111] In any of the above embodiments, further, as Figure 4 As shown, the first stator 102 further includes: a second stator yoke 130; a plurality of third teeth 132, which form the inner wall of the second stator yoke 130, and a second stator groove 134 between two adjacent third teeth 132. A plurality of first teeth 104 are disposed on the third teeth 132, and a groove 140 is formed between two adjacent first teeth 104 on the same third tooth 132. The first groove 124 includes the second stator groove 134 and the groove 140.

[0112] In this embodiment, the first tooth 104 may specifically include a second stator yoke 130 and a plurality of third teeth 132 disposed on the second stator yoke 130. Further, the plurality of first teeth 104 are disposed on the third teeth 132, meaning that each third tooth 132 may have at least two first teeth 104, i.e., the plurality of first teeth 104 are arranged in the form of split teeth on the third teeth 132. At this time, a groove 140 is formed between two adjacent first teeth 104, and a second stator groove 134 is formed between two adjacent third teeth 132. Based on this, the plurality of first grooves 124 on the first stator 102 include both the groove 140 and the second stator groove 134.

[0113] In other words, when the multiple first teeth 104 of the first stator 102 are arranged in the form of split teeth on the third tooth 132, the opening of the first slot 124 includes the width of the second stator slot 134 between two adjacent third teeth 132 and the width of the groove 140 between two adjacent first teeth 104. At this time, the width value a2 of the opening of the first slot 124 includes the width a3 of the second stator slot 134 or the width value a4 of the groove 140. That is, the difference between one of the tooth tip width of the first tooth 104, the width of the second stator slot 134 between the third teeth 132, and the width of the groove 140 between two adjacent first teeth 104 and one of the width values ​​of the permanent magnet 112 or the magnetic shielding part 114 on the side close to the first tooth 104 is less than or equal to 15%.

[0114] In other words, motor 100 satisfies at least one of the following:

[0115] Among multiple a1, multiple a3, and multiple a4, there exists one with a value of the first value L1; among multiple c1 and multiple c2, there exists one with a value of the second value L2, satisfying |L1-L2|÷L1≤0.15 or |L1-L2|÷L2≤0.15.

[0116] There exists a value L3 among multiple b1 and multiple b2, and there exists a value L4 among multiple d1 and multiple d2, satisfying |L3-L4|÷L3≤0.15 or |L3-L4|÷L4≤0.15.

[0117] Furthermore, the third tooth 132 also includes: a second tooth body 136 connected to the second stator yoke 130; and a second tooth shoe 138 disposed on the second tooth body 136, with a slot of the second stator groove 134 between the two second tooth shoes 138.

[0118] Specifically, the third tooth 132 may include a second tooth body 136 and a second tooth shoe 138, wherein the second tooth body 136 is connected to the second stator yoke 130, the second tooth shoe 138 is disposed on the second tooth body 136, and the second stator groove 134 is located between two adjacent second tooth shoes 138.

[0119] By setting the second toothed shoe 138, more harmonic components are introduced into the air gap magnetic permeability, which significantly improves the performance of the motor 100.

[0120] In any of the above embodiments, further, in the radial direction of the motor 100, the angle between the center line of the first slot 124 and the center line of the second tooth 108 is less than or equal to 45 / Ns degrees, where Ns is the number of the first slots.

[0121] In this embodiment, the first stator 102 includes a first stator yoke 116, and a first slot 124 is formed between two adjacent first teeth 104. Along the rotation direction of the rotor 110, the angle between the centerline of the first slot 124 and the centerline of the second tooth 108 is less than or equal to 45 / Ns degrees, where Ns is the number of first slots 124. This ensures the distribution of the magnetic field during the operation of the motor 100, thereby ensuring the stable operation of the motor 100.

[0122] Furthermore, the first stator 102 includes a second stator yoke 130 and a plurality of third teeth 132. A plurality of first teeth 104 are disposed on the third teeth 132, and a groove 140 is formed between adjacent first teeth 104. A first slot 124 includes a second stator slot 134 and a groove 140 between adjacent third teeth 132. Along the rotation direction of the rotor 110, the angle between the centerline of the second stator slot 134 or the centerline of the groove 140 and the centerline of the second tooth 108 is less than or equal to 45 / Ns degrees, where Ns is the number of first slots 124, which is the sum of the number of second stator slots 134 and the number of grooves 140. This ensures the distribution of the magnetic field during the operation of the motor 100, thereby ensuring the stable operation of the motor 100.

[0123] The motor 100 of the present invention, by radially arranging the first stator 102 and the second stator 106, thereby placing the rotor 110 of the motor 100 between the first stator 102 and the second stator 106, effectively improves the power density and enhances the power distribution performance of the motor 100 during operation. Furthermore, by limiting the angle between the first stator 102 and the second stator 106, the magnetic flux density in the first stator 102, the second stator 106, and the rotor 110 can be effectively improved during the operation of the motor 100, thereby effectively reducing the losses of the motor 100 and improving the operating efficiency of the motor 100.

[0124] In any of the above embodiments, further, as Figure 5 As shown, there is a first air gap 144 between the first stator 102 and the rotor 110; and there is a second air gap 146 between the second stator 106 and the rotor 110.

[0125] In this embodiment, the arrangement of the first stator 102 and the second stator 106 effectively improves the power density of the motor 100 during operation, enhances the power distribution performance of the motor 100, and significantly improves the torque density of the motor 100 during operation, thereby significantly increasing the torque of the motor 100 and ensuring the high-speed and high-torque operation requirements of the motor 100. Furthermore, a first air gap 144 is formed between the first stator 102 and the rotor 110, and a second air gap 146 is formed between the second stator 106 and the rotor 110, thus realizing a dual-air gap structure for the motor 100. This improves the waveform of the air gap magnetic field between the first stator 102 and the second stator 106 and the rotor 110 during motor operation, making the magnetic field formed by the permanent magnet 112 of the rotor 110 in the air gap closer to a sinusoidal shape, thereby reducing the cogging torque and torque fluctuation of the motor 100.

[0126] In any of the above embodiments, further, as Figure 5 , Figure 6 , Figure 7 and Figure 8 As shown, the motor 100 also includes a winding 122, which is disposed on at least one of the first stator 102 and the second stator 106.

[0127] In this embodiment, by setting the winding 122, the first stator 102 or the second stator 106 can cooperate with the permanent magnet 112 on the rotor 110 to ensure the stable output of the torque and speed of the motor 100 and ensure the operating efficiency of the motor 100.

[0128] Specifically, the winding 122 can be disposed on either the first stator 102 or the second stator 106 to meet the requirements of the motor 100 for different magnetic field distributions, thereby achieving different torque outputs of the motor 100. Furthermore, by disposing of the winding 122 on only one of the first stator 102 and the second stator 106, the operating efficiency of the motor 100 can be guaranteed while saving material for the winding 122, effectively reducing the manufacturing cost of the motor 100, and also simplifying the manufacturing structure.

[0129] Furthermore, the winding 122 can also be simultaneously disposed on the first stator 102 and the second stator 106 to increase the magnetic flux density of the motor 100 and further improve the torque output of the motor 100.

[0130] Furthermore, the second stator 106 may include a third stator yoke 142, and the winding 122 may be disposed on the first stator yoke 116 of the first stator 102 or on the third stator yoke 142 of the second stator 106, thereby further improving the magnetic field waveform in the air gap between the first stator 102 and the second stator 106 and the rotor 110, so that the magnetic field formed by the permanent magnet 112 of the rotor 110 in the first air gap 144 and the second air gap 146 is closer to a sine shape, thereby further reducing the cogging torque and torque fluctuation of the motor 100, and thus improving the stability of the motor 100 during operation.

[0131] The motor 100 of the present invention, by radially arranging the first stator 102 and the second stator 106, allows the rotor 110 of the motor 100 to be positioned between the first stator 102 and the second stator 106, thereby effectively improving the power density during operation and enhancing the power distribution performance of the motor 100. Furthermore, depending on the specific operating parameters and environment of the motor 100, the winding 122 can be individually disposed on the first stator yoke 116 of the first stator 102, or individually disposed on the third stator yoke 142 of the second stator 106. This saves on the amount of winding 122 used while ensuring the operating frequency of the motor 100, thereby reducing the assembly process and manufacturing cost of the motor 100. Alternatively, the winding can be simultaneously disposed on both the first stator yoke 116 and the third stator yoke 142 to ensure optimal motor operation.

[0132] Specifically, the second tooth 108 and the third stator yoke 142 can be detachably connected, meaning they can be separated into a single, detachable assembly structure. This detachable assembly structure allows for easier winding of the coil on the second tooth 108 during the assembly of the second stator 106, followed by connecting one end of the second tooth 108 to the third stator yoke 142. This simplifies the winding process, reduces winding difficulty, increases the slot fill factor of the winding 122, improves the output performance of the motor 100 from a stator manufacturing perspective, and reduces waste.

[0133] Specifically, the second tooth 108 and the third stator yoke 142 can be connected by a concave-convex structure. That is, a groove or protrusion is provided at one end of the second tooth 108, and correspondingly, a protrusion or groove that cooperates with the groove or protrusion is provided at the corresponding position of the third stator yoke 142. Thus, the connection between the second tooth 108 and the third stator yoke 142 can be achieved through the cooperation of the groove and the protrusion.

[0134] Furthermore, such as Figure 6 and Figure 7 As shown, the first stator 102 includes a first stator yoke 116, the first tooth 104 includes a first tooth body 118 and a first tooth shoe 120, and each first tooth body 118 is provided with a winding 122; and / or each second tooth 108 is provided with a winding 122.

[0135] Specifically, based on the first stator 102 including a first stator yoke 116 and the first tooth 104 including a first tooth body 118 and a first tooth shoe 120, each winding 122 can be disposed on one first tooth body 118. Correspondingly, when windings 122 are disposed on the second stator 106, each winding 122 can be disposed on one second tooth 108. That is to say, by distributing the windings 122 in a concentrated manner, the winding process of the windings 122 can be simplified while ensuring that the air gap magnetic field has sufficient sinusoidality during the operation of the motor 100, thereby reducing the manufacturing difficulty and cost of the motor 100.

[0136] Furthermore, each winding 122 can be simultaneously disposed on two adjacent first tooth bodies 118.

[0137] Specifically, the winding 122 can be wound on the first tooth body 118 first, and then one end of the first tooth shoe 120 can be connected to the first stator yoke 116. This simplifies the winding process in the assembly of the first stator 102, reduces the difficulty of winding, increases the slot fill factor of the winding 122, improves the output performance of the motor 100 from the perspective of stator preparation, and reduces waste.

[0138] Furthermore, such as Figure 8 As shown, the first stator 102 includes a second stator yoke 130 and multiple third teeth 132. Multiple first teeth 104 are disposed on the third teeth 132. Each third tooth 132 includes a second tooth body 136 and a second tooth shoe 138. Each winding 122 can be simultaneously disposed on two adjacent second tooth bodies 136. That is, the windings 122 are configured in a distributed winding manner. This distributed winding method effectively enhances the sinusoidal nature of the air gap magnetic field between the first stator 102 or the second stator 106 and the rotor 110, thereby further reducing the cogging torque and torque fluctuation of the motor 100, and thus improving the stability of the motor 100 during operation.

[0139] Furthermore, the winding 122 can also be configured as a concentric winding. Specifically, the coil of the winding 122 is configured as a U-shape, that is, the coil is configured as a multi-layer concentric coil, with each layer of coil wound with a different number of first teeth 118.

[0140] In any of the above embodiments, further, as Figure 2 As shown, the magnetic poles of two adjacent permanent magnets 112 are opposite.

[0141] By setting the magnetic poles of two adjacent permanent magnets 112 to opposite directions, the two adjacent permanent magnets 112 can form an effective magnetic focusing effect, thereby further improving the air gap magnetic flux density between the first stator 102 and the second stator 106 and the rotor 110 assembly, which can effectively improve the torque of the motor 100, reduce torque fluctuation, and improve the stability of the motor 100.

[0142] Specifically, such as Figure 9 and Figure 10 As shown, the permanent magnet 112 can be arranged in a spoke-shaped magnet arrangement or a V-shaped magnet arrangement.

[0143] Furthermore, the magnetic shielding part 114 includes magnetically conductive components and / or non-magnetically conductive components.

[0144] Specifically, the magnetic isolation portion 114 between adjacent permanent magnets 112 can be configured as a magnetic conductive component. Specifically, the rotor 110 can include an annular rotor core, with mounting slots for mounting the permanent magnets 112 spaced apart on the annular rotor core. Simultaneously, a magnetic bridge is formed between the mounting slots using the body of the core; this magnetic bridge serves as the magnetic isolation portion 114, thereby achieving spacing between adjacent permanent magnets 112. Through this configuration, at least a portion of the rotor core can be utilized, simplifying the machining process of the rotor 110, reducing machining difficulty, and thus lowering the manufacturing cost of the motor 100.

[0145] Furthermore, the magnetic shielding part 114 may also include non-magnetic components, thereby effectively preventing magnetic leakage of the rotor 110 assembly, thereby improving the magnetic flux density during the operation of the motor 100 and ensuring the operating performance of the motor 100.

[0146] Furthermore, the permanent magnet 112 is composed of ferrite or rare earth permanent magnet.

[0147] Specifically, ferrite or rare earth permanent magnets have good magnetic properties. By using ferrite or rare earth permanent magnets as permanent magnets 112 in the rotor 110 assembly, it can be ensured that the permanent magnets 112 can provide magnetic energy effectively for a long time, thereby ensuring the long-term stable operation of the motor 100.

[0148] The motor 100 of the present invention, by radially arranging the first stator 102 and the second stator 106, allows the rotor 110 of the motor 100 to be positioned between the first stator 102 and the second stator 106, thereby effectively improving the power density during operation and enhancing the power distribution performance of the motor 100. Furthermore, by setting the arrangement of the permanent magnets 112, the material of the permanent magnets 112, and the arrangement of the magnetic shielding parts 114, the rationality of the air gap magnetic flux density and magnetic field distribution during motor operation is further ensured, thereby guaranteeing the long-term stable operation of the motor 100.

[0149] In any of the above embodiments, the number of pole pairs of the winding 122 further satisfies the following relationship: Pa=|Ns±Zr / 2|; where Pa is the number of pole pairs of the winding 122, Ns is the number of the first slots, and Zr is the number of the magnetic isolation parts 114.

[0150] In this embodiment, by limiting the number of pole pairs of winding 122, the normal operation of motor 100 is ensured. Furthermore, new harmonic components appearing in the air gap magnetic flux density can serve as operating harmonics for motor 100, providing output torque and effectively improving the torque density of motor 100. Specifically, the number of pole pairs of winding 122 of motor 100 satisfies the following relationship: Pa=|Ns±Zr / 2|; where Pa is the number of pole pairs of winding 122 of motor 100, Ns is the total number of first slots 124, and Zr is the number of magnetically shielding sections 114.

[0151] Specifically, the first tooth 104 includes a first tooth body 118 and a first tooth shoe 120. There is a slot for a first stator groove between two adjacent first tooth shoes 120. The total number of first grooves 124 is the number of first stator grooves between two adjacent first tooth shoes 120.

[0152] When the multiple first teeth 104 of the first stator 102 are arranged in the form of split teeth on the third tooth 132, the first groove 124 includes the second stator groove 134 between two adjacent third teeth 132 and the groove 140 between two adjacent first teeth 104. At this time, the total number of first grooves 124 is the sum of the number of second stator grooves 134 and grooves 140.

[0153] According to a second aspect of the present invention, an electrical device is provided, comprising a motor 100 of any of the above embodiments.

[0154] The electrical device provided by this invention includes a motor 100 as described in any of the above embodiments. Therefore, by configuring the first stator 102 and the second stator 106 of the motor 100, the power density during motor 100 operation can be effectively improved, the power distribution performance of the motor 100 can be enhanced, and the torque density during motor 100 operation can be significantly improved, thereby significantly improving the torque of the motor 100 and ensuring the high-speed and high-torque operation requirements of the motor 100. Compared with related technologies, while ensuring the performance of the motor 100, the radial volume of the motor 100 can also be effectively reduced, which is beneficial to the miniaturization design of electrical devices.

[0155] Furthermore, by defining the relationship between the relevant dimensions in the first stator 102 and the relevant dimensions in the rotor 110 of the motor 100, and by defining the relationship between the relevant dimensions in the second stator 106 and the relevant dimensions in the rotor 110, the torque density of the motor 100 during operation can be effectively increased, thereby effectively increasing the torque of the motor 100. It can also significantly reduce the torque pulsation and cogging torque of the motor 100, thereby improving the stability of the motor 100, and thus improving the stability of the electrical equipment and enhancing the market competitiveness of the electrical equipment.

[0156] Specifically, electrical appliances can include air conditioners, washing machines, vacuum cleaners, etc.

[0157] In the description of this invention, the term "a plurality of" refers to two or more. Unless otherwise explicitly defined, the terms "upper," "lower," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. The terms "connection," "installation," "fixing," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection or an indirect connection through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in this invention can be understood according to the specific circumstances.

[0158] 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.

[0159] The above are merely preferred embodiments of the present invention and are not intended to limit the present 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. An electric motor, characterized in that, include: The first stator includes a plurality of first teeth and a plurality of first slots, wherein the tooth tip width of the first tooth is a1 and the slot opening width of the first slot is a2. The second stator is disposed inside the first stator. The second stator includes a plurality of second teeth, and there is a second groove between adjacent second teeth. The tooth tip width of the second tooth is b1, and the groove opening width of the second groove is b2. A rotor is disposed between the first stator and the second stator. The rotor includes a plurality of alternately arranged permanent magnets and magnetic shielding parts. The width of the end of the permanent magnet facing the first stator is c1, the width of the end of the magnetic shielding part facing the first stator is c2, the width of the end of the permanent magnet facing the second stator is d1, and the width of the end of the magnetic shielding part facing the second stator is d2. The motor satisfies at least one of the following: Among the plurality of a1 and the plurality of a2, there is one value of a first value L1, and among the plurality of c1 and the plurality of c2, there is one value of a second value L2, satisfying |L1-L2|÷L1≤0.15 or |L1-L2|÷L2≤0.15; Among the plurality of b1 and the plurality of b2, there is one value of a third value L3, and among the plurality of d1 and the plurality of d2, there is one value of a fourth value L4, satisfying |L3-L4|÷L3≤0.15 or |L3-L4|÷L4≤0.15; The first stator also includes: The first stator yoke has the first tooth disposed on the inner wall of the first stator yoke, and a first stator groove is provided between two adjacent first teeth; Wherein, the first slot includes the first stator slot; The first tooth also includes: The first tooth body is connected to the first stator yoke; The first tooth shoe is disposed on the first tooth body, and there is a slot for the first stator groove between the two first tooth shoes; Wherein, the first tooth body and the first tooth shoe are detachably connected, and the first tooth body and the first stator yoke are detachably connected; The first stator and the rotor also satisfy: |a max -(k1×c1+k2×c2)∣÷a max ≤0.15, or |a max -(k1×c1+k2×c2)∣÷(k1×c1+k2×c2)≤0.15, where a max The maximum value among the plurality of a1 and the plurality of a2, where k1 and k2 are both integers greater than or equal to 1; and / or The second stator and the rotor also satisfy: |b max -(k3×d1+k4×d2)∣÷b max ≤0.15, or |b max -(k3×d1+k4×d2)∣÷(k3×d1+k4×d2)≤0.15, where b max k1 is the maximum value among the plurality of b1 and the plurality of b2, and k3 and k4 are both integers greater than or equal to 1.

2. The motor according to claim 1, characterized in that, The first stator also includes: Second stator yoke; Multiple third teeth are provided on the inner wall of the second stator yoke, and a second stator groove is provided between two adjacent third teeth. The multiple first teeth are provided on the third teeth, and a groove is provided between two adjacent first teeth on the same third tooth. The first groove includes the second stator groove and the recess.

3. The motor according to claim 2, characterized in that, The third tooth also includes: The second tooth body is connected to the second stator yoke; The second toothed shoe is disposed on the second tooth body, and there is a slot for the second stator groove between the two second toothed shoes.

4. The motor according to any one of claims 1 to 3, characterized in that, In the radial direction of the motor, the angle between the centerline of the first slot and the centerline of the second tooth is less than or equal to 45 / Ns degrees. Where Ns is the number of the first slots.

5. The motor according to any one of claims 1 to 3, characterized in that, There is a first air gap between the first stator and the rotor; The second stator and the rotor have a second air gap.

6. The motor according to any one of claims 1 to 3, characterized in that, Also includes: A winding, wherein the winding is disposed on at least one of the first stator and the second stator.

7. The motor according to claim 1, characterized in that, The magnetic poles of two adjacent permanent magnets are opposite.

8. The motor according to claim 1, characterized in that, The magnetic shielding part includes magnetically conductive components and / or non-magnetically conductive components.

9. The motor according to claim 1, characterized in that, The permanent magnet includes ferrite or rare earth permanent magnet.

10. The motor according to claim 6, characterized in that, The number of pole pairs of the winding satisfies the following relationship: Pa=∣Ns±Zr / 2∣; Where Pa is the number of pole pairs of the winding, Ns is the number of the first slots, and Zr is the number of the magnetic isolation sections.

11. An electrical appliance, characterized in that, include: The motor as described in any one of claims 1 to 10.

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