Stator structure, motor and electrical equipment

Abstract

This invention proposes a stator structure, a motor, and an electrical device. The stator structure includes: an annular portion; and salient poles disposed on the inner peripheral wall of the annular portion and extending axially along the annular portion. The projected area of ​​the salient poles along the axial direction of the annular portion is greater than the cross-sectional area of ​​the salient poles. This invention optimizes the distribution of salient poles in the annular portion, eliminating the need to increase the number of salient poles or add other structures. While reducing torque ripple in the motor, it does not increase the cost of the motor, thus offering a cost advantage.

Description

Technical Field

[0001] This invention relates to the field of electric motors, and more specifically, to a stator structure, an electric motor, and electrical equipment. Background Technology

[0002] In related technologies, torque ripple in permanent magnet motors is reduced by means of rotor skew; however, rotor skew makes the shape of the permanent magnet complex and increases the cost of the motor. 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 a stator structure.

[0005] A second aspect of the present invention provides an electric motor.

[0006] A third aspect of the present invention provides an electrical device.

[0007] The first aspect of the present invention provides a stator structure, comprising: an annular portion; a salient pole disposed on the inner peripheral wall of the annular portion and extending along the axial direction of the annular portion; wherein the projected area of ​​the salient pole in the axial direction of the annular portion is greater than the cross-sectional area of ​​the salient pole.

[0008] The stator structure proposed in this invention includes an annular portion and a salient pole. The salient pole protrudes from the inner peripheral wall of the annular portion and extends axially along the annular portion. Furthermore, the projected area of ​​the salient pole along the axial direction of the annular portion is greater than the cross-sectional area of ​​the salient pole.

[0009] Specifically, this invention proposes an optimized stator structure for the shape of the salient poles, such that the axial projected area of ​​the salient pole in the annular portion is greater than the cross-sectional area of ​​the salient pole. Specifically, this can be achieved by tilting the salient pole relative to the axial direction of the annular portion, or by segmenting the salient pole in the axial direction of the annular portion, with the different segments of the salient pole being staggered. In this way, during the use of a motor employing this stator structure, the magnetic field regulation effect of the salient pole can be significantly improved, resulting in lower torque ripple in the motor; and it ensures that the torque of the motor using this stator structure is not affected, thereby improving the smoothness of motor operation.

[0010] Furthermore, this invention only requires optimization of the distribution of salient poles in the annular portion, without increasing the number of salient poles or adding any other structures. This allows the invention to reduce torque ripple in the motor without increasing its cost, thus offering a cost advantage.

[0011] Specifically, the stator structure proposed in this invention can be applied to dual-air-gap permanent magnet motors and can be used as the outer stator of dual-air-gap permanent magnet motors. During use, no windings are installed on the stator structure.

[0012] In some possible designs, the extension direction of the salient pole is set at an angle relative to the axial direction of the annular portion.

[0013] In this design, the extension direction of the salient pole is inclined relative to the axial direction of the annular portion. That is, compared to the salient poles extending axially along the annular portion in related technologies, this invention improves the extension direction of the salient pole, making it inclined relative to the axial direction of the annular portion. This significantly reduces torque ripple in motors using this stator structure, thus improving the smoothness of motor operation.

[0014] In some possible designs, a salient pole is provided on the inner peripheral wall of the annular portion along the axial direction.

[0015] In this design, a salient pole is provided on the inner peripheral wall of the annular portion along its axial direction. That is, the invention provides a complete salient pole along the axial direction of the annular portion, and this salient pole is inclined relative to the axial direction of the annular portion. In particular, the salient pole being a complete structure along the axial direction of the annular portion reduces the machining difficulty of the stator structure, thereby reducing torque ripple in the motor using this stator structure, further reducing the machining difficulty of the stator structure, and improving the machining efficiency of the stator structure.

[0016] In some possible designs, at least two salient poles are provided on the inner peripheral wall of the annular portion along its axial direction.

[0017] In this design, at least two salient poles are provided on the inner peripheral wall of the annular portion along its axial direction; wherein, at least two salient poles are spaced apart along the axial direction of the annular portion. That is, the invention provides at least two discontinuous salient poles along the axial direction of the annular portion, and each salient pole is inclined relative to the axial direction of the annular portion. In particular, the discontinuous structure of the salient poles along the axial direction of the annular portion reduces the material requirements of the stator structure, thereby reducing the torque pulsation of the motor using this stator structure, lowering the material cost of the stator structure, and improving the material utilization rate of the stator structure.

[0018] In some possible designs, the axial direction of the annular portion is such that the inclination direction of two adjacent salient poles relative to the axial direction of the annular portion is the same.

[0019] In this design, at least two salient poles are provided on the inner circumferential wall of the annular portion along its axial direction. Furthermore, the inclination direction of adjacent salient poles relative to the axial direction of the annular portion is the same. Thus, adjacent salient poles are inclined in a straight line along the axial direction of the annular portion. This ensures that the inclination direction of adjacent salient poles is the same relative to the axial direction of the annular portion, simplifying the overall stator structure and reducing torque ripple in the motor using this stator structure, while also reducing the difficulty of stator fabrication.

[0020] In some possible designs, the axial direction of the annular portion is such that the inclination directions of two adjacent salient poles are opposite to those of the annular portion.

[0021] In this design, at least two salient poles are provided on the inner circumferential wall of the annular portion along its axial direction. Furthermore, the inclination directions of adjacent salient poles relative to the axial direction of the annular portion are opposite. Thus, adjacent salient poles are V-shaped inclinations along the axial direction of the annular portion. The opposite inclination directions of adjacent salient poles relative to the axial direction of the annular portion further optimize the distribution of salient poles on the annular portion, thereby further reducing the machining difficulty of the stator structure.

[0022] In some possible designs, at least two salient poles are provided on the inner peripheral wall of the annular portion along the axial direction, with adjacent salient poles being staggered.

[0023] In this design, at least two salient poles are provided on the inner circumferential wall of the annular portion along its axial direction, with the adjacent two salient poles staggered. That is, in the axial direction of the annular portion, the present invention provides at least two discontinuous salient poles, ensuring that adjacent two salient poles are staggered in the circumferential direction of the annular portion, so that the adjacent two salient poles are not continuous. This allows the motor using this stator structure to have lower torque ripple and ensures that the motor torque is not affected.

[0024] In some possible designs, at least one salient pole extends axially along the annular portion.

[0025] In this design, at least two salient poles are provided on the inner circumferential wall of the annular portion along its axial direction, with the adjacent ends of the salient poles staggered; and at least one salient pole extends along the axial direction of the annular portion. That is, in this design, the salient poles extending along the axial direction of the annular portion can be staggered. This ensures that the motor using this stator structure has lower torque ripple and that the motor torque is not affected. Furthermore, it further reduces the machining difficulty of the stator structure.

[0026] In some possible designs, the inner peripheral wall of the annular portion is provided with at least two convex poles in the circumferential direction, and there is a recess between two adjacent convex poles.

[0027] In this design, at least two convex poles are provided on the inner circumferential wall of the annular portion in the circumferential direction. Furthermore, the at least two convex poles are spaced apart along the circumferential direction of the annular portion, and a recess is formed between adjacent convex poles.

[0028] A second aspect of the present invention provides an electric motor comprising: a stator structure and a rotor assembly as described in the first aspect of the present invention, disposed on the outer or inner periphery of the stator structure.

[0029] The electric motor proposed in this invention includes a stator structure and the stator structure of the first aspect of this invention. Therefore, this motor possesses all the beneficial effects of the aforementioned stator structure, exhibiting lower torque ripple and higher torque.

[0030] In some possible designs, the stator structure is disposed on the outer periphery of the rotor assembly, and the motor further includes: a stator assembly disposed on the inner side of the rotor assembly; wherein, there is a first air gap between the stator structure and the rotor assembly, and a second air gap between the rotor assembly and the stator assembly.

[0031] In this design, the rotor assembly is located on the outer periphery of the stator assembly, and the stator structure is located on the outer periphery of the rotor assembly. Furthermore, there is a first air gap (outer air gap) between the stator structure and the rotor assembly, and a second air gap (inner air gap) between the rotor assembly and the stator assembly. This allows the first and second air gaps to balance the reluctance and harmonic magnetic fields, thereby achieving a balance in the reluctance and harmonic magnetic fields of the entire motor.

[0032] Furthermore, in the radial direction of the stator structure, the size of the first air gap is smaller than that of the second air gap. This difference in size between the two air gaps allows for adjustment of the overall air gap magnetic flux density, thereby balancing the reluctance and harmonic magnetic field, ultimately achieving a balance between the reluctance and harmonic magnetic field of the entire motor. Specifically, the optimal effect is achieved when the ratio of the size of the first air gap to the size of the second air gap is greater than or equal to 0.03:3 and less than or equal to 0.1:3.

[0033] In some possible designs, the rotor assembly includes: multiple magnetic blocks spaced apart on the outer periphery of the stator assembly, with adjacent magnetic blocks connected together; and multiple permanent magnets disposed between adjacent magnetic blocks, with the polarities of adjacent permanent magnets opposite.

[0034] In this design, the rotor assembly includes multiple magnetic blocks and multiple permanent magnets. The magnetic blocks are spaced apart on the outer periphery of the stator assembly, and adjacent magnetic blocks are connected. The permanent magnets are respectively disposed between adjacent magnetic blocks, and the polarities of adjacent permanent magnets are opposite, forming a magnetic focusing effect.

[0035] Furthermore, two adjacent magnetic blocks can be connected by either magnetic or non-magnetic components.

[0036] Furthermore, the magnets can be configured as a built-in spoke-type magnet arrangement or a built-in V-shaped magnet arrangement.

[0037] In some possible designs, the stator assembly includes: a stator core, which includes multiple stator teeth and stator slots between adjacent stator teeth; and a winding, which is disposed on the stator teeth and located in the stator slots; wherein the number of magnetic blocks Zr, the number of stator slots Ns, and the number of pole pairs Pa of the winding satisfy: Pa=│Ns±Zr / 2│.

[0038] In this design, the stator assembly includes a stator core and windings. The stator core includes multiple stator main teeth spaced apart, with stator slots between adjacent stator main teeth; the windings are wound around the stator main teeth and located within the stator slots.

[0039] Furthermore, the number of magnetic blocks Zr, the number of stator slots Ns, and the number of pole pairs Pa of the windings satisfy: Pa=│Ns±Zr / 2│. In this way, the new harmonic components appearing in the air gap magnetic flux density can serve as the operating harmonics of the motor, providing output torque for the motor, thereby effectively improving the torque density of the motor and further improving the efficiency of the motor.

[0040] In some possible designs, the stator assembly also includes: at least two stator secondary teeth, tooth shoes disposed on the stator primary teeth, and grooves between adjacent stator secondary teeth.

[0041] In this design, the stator assembly also includes at least two stator auxiliary teeth. These at least two auxiliary teeth are positioned on the tooth shoes of the main stator teeth, with grooves between adjacent auxiliary teeth. Thus, the auxiliary stator teeth, in addition to serving as magnetic conductors, can also function as modulation components, achieving magnetic field modulation. This differs from conventional permanent magnet motors used in related technologies (where slot openings are smaller and air gap permeability is close to constant).

[0042] In the motor proposed in this invention, the stator main teeth are split into at least two stator auxiliary teeth, introducing more harmonic components into the air gap magnetic permeability. This significantly improves the motor's performance. Furthermore, the motor has a simple structure, is easy to manufacture, does not significantly increase the motor's cost, and does not exhibit significant vibration or noise.

[0043] In some possible designs, there is a slot between the tooth shoes of adjacent stator main teeth, and the slot is connected to the stator slot; in the circumferential direction of the stator core, the size of the slot is different from the size of the groove.

[0044] In this design, there are slots between the tooth shoes of adjacent stator main teeth, which are connected to the stator slots to facilitate winding. Furthermore, the dimensions of the slots and grooves are unequal in the circumferential direction of the stator core. By setting the dimensions of the grooves and slots to be unequal, the uniformity of the stator auxiliary teeth distribution on all stator main teeth on the circumference can be changed, reducing the number of air gap magnetic permeability cycles. By reducing the number of air gap magnetic permeability cycles, the modulated magnetic flux density harmonic components will increase, thus generating more operating harmonics and further improving the motor output torque.

[0045] In some possible designs, the winding is wound around the body of the stator main teeth or around the yoke of the stator main teeth.

[0046] In this design, the winding can be wound onto the body of the stator main teeth or onto the yoke of the stator main teeth. When the winding is wound onto the yoke of the stator main teeth, the end of the winding can be shortened, thus effectively balancing the contradiction between excessively long winding ends and the high winding factor of the motor. When the winding is wound onto the body of the stator main teeth, the winding difficulty can be reduced, and the improvement range of the motor can be decreased.

[0047] In some possible designs, the windings are concentrated windings.

[0048] In this design, the windings are concentrated, which facilitates winding and further improves the production efficiency of the motor.

[0049] A third aspect of the present invention provides an electrical device comprising: a motor as described in the second aspect of the present invention.

[0050] The electrical device proposed in this invention includes the motor as described in the second aspect above. Therefore, it possesses all the beneficial effects of the aforementioned motor, which will not be discussed in detail here.

[0051] Specifically, the electrical equipment proposed in this invention can be products such as refrigerators, washing machines, and air conditioners.

[0052] 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

[0053] 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:

[0054] Figure 1 This is one of the structural schematic diagrams of a stator structure according to an embodiment of the present invention;

[0055] Figure 2 This is a second schematic diagram of the stator structure according to an embodiment of the present invention;

[0056] Figure 3 This is the third schematic diagram of the stator structure according to an embodiment of the present invention;

[0057] Figure 4 This is a schematic diagram of the structure of a motor according to an embodiment of the present invention;

[0058] Figure 5 yes Figure 4 A magnified view of part A of the motor shown;

[0059] Figure 6 yes Figure 4 A magnified view of part B of the motor shown;

[0060] Figure 7 This is a schematic diagram showing the relationship between the tilt angle of the extension direction of the salient pole relative to the axial direction of the annular portion in a motor according to an embodiment of the present invention and the torque pulsation and torque of the motor.

[0061] in, Figures 1 to 6 The correspondence between the reference numerals and component names in the attached drawings is as follows:

[0062] 100 Stator structure, 102 Circular part, 104 Salient pole, 106 Recess, 200 Stator assembly, 202 Stator core, 204 Stator main teeth, 206 Stator slot, 208 Winding, 210 Stator auxiliary teeth, 212 Groove, 214 Slot, 300 Rotor assembly, 302 Magnetic guide block, 304 Permanent magnet, 400 First air gap, 500 Second air gap. Detailed Implementation

[0063] 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 of the present invention and the features thereof can be combined with each other.

[0064] 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.

[0065] The following reference Figures 1 to 7 This describes a stator structure 100, a motor, and electrical equipment provided according to some embodiments of the present invention. Figure 1 , Figure 2 and Figure 3 In the diagram, the dotted line L represents the axial direction of the annular portion 102. Figure 7In the diagram, the horizontal axis represents the angle of inclination of the extension direction of the salient pole 104 relative to the axial direction of the annular portion 102 when the extension direction of the salient pole 104 is inclined relative to the axial direction of the annular portion 102; the vertical axis on the left and line L1 represent the torque pulsation of the motor; and the vertical axis on the right and line L2 represent the torque of the motor. Furthermore, the cross-sectional area of ​​the salient pole 104 in this invention refers to the cross-sectional area of ​​the salient pole 104 when it is cut by a plane perpendicular to the axial direction of the salient pole 104.

[0066] like Figure 1 , Figure 2 and Figure 3 As shown, the first embodiment of the present invention provides a stator structure 100, including an annular portion 102 and a salient pole 104. The salient pole 104 protrudes from the inner peripheral wall of the annular portion 102 and extends along the axial direction of the annular portion 102. Furthermore, the projected area of ​​the salient pole 104 along the axial direction of the annular portion 102 is greater than the cross-sectional area of ​​the salient pole 104.

[0067] Specifically, the present invention proposes to optimize the shape of the salient pole 104 in the stator structure 100, such that the projected area of ​​the salient pole 104 in the annular portion 102 along the axial direction is greater than the cross-sectional area of ​​the salient pole 104. Specifically, the salient pole 104 may be inclined relative to the axial direction of the annular portion 102, or the salient pole 104 may be segmented in the axial direction of the annular portion 102, with the different segments of the salient pole 104 being staggered.

[0068] Thus, as Figure 7 As shown, during the use of the motor using this stator structure 100, the effect of the salient pole 104 on the regulation of the magnetic field can be significantly improved, thereby making the motor using this stator structure 100 have lower torque ripple; and it can ensure that the torque of the motor using this stator structure 100 is not affected, thereby improving the stability of the motor during operation.

[0069] Furthermore, this invention only requires optimizing the distribution of the salient poles 104 in the annular portion 102, without increasing the number of salient poles 104 or adding any other structures. This allows the invention to reduce motor torque ripple without increasing motor cost, thus offering a cost advantage.

[0070] Specifically, the stator structure 100 proposed in this invention can be applied to a dual-air-gap permanent magnet motor and can be used as the outer stator of a dual-air-gap permanent magnet motor. During use, the stator structure 100 does not have windings 208. Therefore, the stator structure 100 proposed in this invention does not require a winding process during use. This design, while ensuring reduced torque ripple in the motor, does not increase the assembly difficulty of the motor, especially not the difficulty of the winding process, thus ensuring that the cost of the motor using this stator structure 100 does not increase.

[0071] Furthermore, the present invention improves the stator structure 100 of the motor, which eliminates the need for windings 208 and permanent magnets 304. Therefore, compared to improvements to the rotor assembly in related technologies, the present invention does not impose more requirements on the structure of the permanent magnets 304, nor does it increase the assembly difficulty of the permanent magnets 304, thus ensuring that the cost of the motor with the stator structure 100 does not increase.

[0072] The second embodiment of the present invention proposes a stator structure 100, which, based on the first embodiment, further includes:

[0073] like Figure 1 and Figure 2 As shown, the extension direction of the salient pole 104 is inclined relative to the axial direction of the annular portion 102. That is, compared to the salient poles extending axially along the annular portion in related technologies, the present invention improves the extension direction of the salient pole 104, making it inclined relative to the axial direction of the annular portion 102. Thus, during the use of a motor employing this stator structure 100, the torque ripple of the motor can be significantly reduced, thereby improving the smoothness of motor operation.

[0074] The third embodiment of the present invention proposes a stator structure 100, which, based on the second embodiment, further includes:

[0075] like Figure 1 As shown, a convex pole 104 is provided on the inner peripheral wall of the annular portion 102 along its axial direction. That is, the present invention provides a complete convex pole 104 along the axial direction of the annular portion 102, and this convex pole 104 is inclined relative to the axial direction of the annular portion 102. In particular, the convex pole 104 is a complete structure along the axial direction of the annular portion 102, which reduces the machining difficulty of the stator structure 100, thereby reducing the torque pulsation of the motor using this stator structure 100, further reducing the machining difficulty of the stator structure 100, and improving the machining efficiency of the stator structure 100.

[0076] Therefore, in this embodiment, a convex pole 104 is provided on the inner peripheral wall of the annular portion 102, and the convex pole 104 extends continuously in the axial direction of the annular portion 102. The convex pole 104 is a complete section structure, and the convex pole 104 is inclined relative to the axial direction of the annular portion 102 to ensure that the projected area of ​​the convex pole 104 in the axial direction of the annular portion 102 is greater than the cross-sectional area of ​​the convex pole 104.

[0077] The fourth embodiment of the present invention proposes a stator structure 100, which, based on the second embodiment, further includes:

[0078] like Figure 1 As shown, at least two salient poles 104 are provided on the inner peripheral wall of the annular portion 102 along its axial direction; wherein, at least two salient poles 104 are spaced apart along the axial direction of the annular portion 102. That is, in the axial direction of the annular portion 102, the present invention provides at least two discontinuous salient poles 104, and each salient pole 104 is inclined relative to the axial direction of the annular portion 102. In particular, the discontinuous structure of the salient poles 104 in the axial direction of the annular portion 102 can reduce the material requirements of the stator structure 100, thereby reducing the torque pulsation of the motor using this stator structure 100, reducing the material cost of the stator structure 100, and improving the material utilization rate of the stator structure 100.

[0079] Therefore, in this embodiment, a convex pole 104 is provided on the inner peripheral wall of the annular portion 102, and the convex pole 104 extends intermittently in the axial direction of the annular portion 102. The convex pole 104 is divided into at least two segments, and the at least two segments of the convex pole 104 are inclined relative to the axial direction of the annular portion 102 to ensure that the projected area of ​​the convex pole 104 in the axial direction of the annular portion 102 is greater than the cross-sectional area of ​​the convex pole 104.

[0080] The fifth embodiment of the present invention proposes a stator structure 100, which, based on the fourth embodiment, further includes:

[0081] In the axial direction of the annular portion 102, at least two salient poles 104 are provided on the inner peripheral wall of the annular portion 102. Furthermore, the inclination direction of adjacent salient poles 104 relative to the axial direction of the annular portion 102 is the same (not shown in the figure). Thus, in the axial direction of the annular portion 102, adjacent salient poles 104 are inclined in a straight line. Since the inclination direction of adjacent salient poles 104 relative to the axial direction of the annular portion 102 is the same, the overall structure of the stator structure 100 is simple, reducing torque pulsation in the motor using this stator structure 100 and lowering the manufacturing difficulty of the stator structure 100.

[0082] Therefore, in this embodiment, a convex pole 104 is provided on the inner peripheral wall of the annular portion 102, and the convex pole 104 extends intermittently in the axial direction of the annular portion 102. The convex pole 104 is divided into at least two segments, and at least two segments of the convex pole 104 are inclined relative to the axial direction of the annular portion 102. The inclination direction of adjacent segments of the convex pole 104 relative to the axial direction of the annular portion 102 is the same, so that adjacent segments of the convex pole 104 are inclined in a straight line, so as to ensure that the projected area of ​​the convex pole 104 in the axial direction of the annular portion 102 is greater than the cross-sectional area of ​​the convex pole 104.

[0083] The sixth embodiment of the present invention proposes a stator structure 100, which, based on the fourth embodiment, further includes:

[0084] like Figure 2 As shown, at least two salient poles 104 are provided on the inner peripheral wall of the annular portion 102 along its axial direction. Furthermore, the inclination directions of adjacent salient poles 104 relative to the axial direction of the annular portion 102 are opposite. Thus, adjacent salient poles 104 are V-shaped inclined along the axial direction of the annular portion 102. The opposite inclination directions of adjacent salient poles 104 relative to the axial direction of the annular portion 102 further optimize the distribution of the salient poles 104 on the annular portion 102, thereby further reducing the processing difficulty of the stator structure 100.

[0085] Therefore, in this embodiment, a convex pole 104 is provided on the inner peripheral wall of the annular portion 102, and the convex pole 104 extends intermittently in the axial direction of the annular portion 102. The convex pole 104 is divided into at least two segments, and the at least two segments of the convex pole 104 are inclined relative to the axial direction of the annular portion 102. Furthermore, the inclination directions of adjacent segments of the convex pole 104 relative to the axial direction of the annular portion 102 are different, so that the adjacent segments of the convex pole 104 are V-shaped inclined, so as to ensure that the projected area of ​​the convex pole 104 in the axial direction of the annular portion 102 is greater than the cross-sectional area of ​​the convex pole 104.

[0086] The seventh embodiment of the present invention proposes a stator structure 100, which, based on the first embodiment, further includes:

[0087] like Figure 3 As shown, in the axial direction of the annular portion 102, at least two salient poles 104 are provided on the inner peripheral wall of the annular portion 102, with the adjacent two-end salient poles 104 being staggered. That is, in the axial direction of the annular portion 102, the present invention provides at least two discontinuous salient poles 104, and ensures that the adjacent two-end salient poles 104 are staggered in the circumferential direction of the annular portion 102, so that the adjacent two-end salient poles 104 are not continuous. In this way, the motor using this stator structure 100 can have lower torque ripple and ensure that the motor torque is not affected.

[0088] In this embodiment, further, as Figure 3As shown, at least two salient poles 104 are provided on the inner peripheral wall of the annular portion 102 along its axial direction, with the adjacent two ends of the salient poles 104 being staggered; and at least one salient pole 104 extends along the axial direction of the annular portion 102. That is, in this design, the salient poles 104 extending along the axial direction of the annular portion 102 can be staggered. In this way, it is also possible to ensure that the motor using this stator structure 100 has lower torque ripple and to ensure that the motor torque is not affected. Furthermore, the processing difficulty of the stator structure 100 can be further reduced.

[0089] Therefore, in this embodiment, a convex pole 104 is provided on the inner peripheral wall of the annular portion 102, and the convex pole 104 extends intermittently in the axial direction of the annular portion 102. The convex pole 104 is divided into at least two structural segments, and the convex pole 104 extending along the axial direction of the annular portion 102 is staggered. The convex pole 104 extends along the axial direction of the annular portion 102 to ensure that the projected area of ​​the convex pole 104 in the axial direction of the annular portion 102 is greater than the cross-sectional area of ​​the convex pole 104.

[0090] Based on the first to seventh embodiments, further, as Figure 1 , Figure 2 and Figure 3 As shown, at least two convex poles 104 are provided on the inner peripheral wall of the annular portion 102 in the circumferential direction. In addition, the at least two convex poles 104 are distributed at intervals along the circumferential direction of the annular portion 102, and a recess 106 is formed between two adjacent convex poles 104.

[0091] Based on the first to seventh embodiments, further, as Figure 1 , Figure 2 and Figure 3 As shown, the annular portion 102 and the salient pole 104 are an integral structure.

[0092] like Figure 4 As shown, the eighth embodiment of the present invention proposes an electric motor (not shown in the figure), including a rotor assembly 300 and a stator structure 100 of any of the above embodiments.

[0093] Therefore, the motor proposed in this invention includes the stator structure 100 of any of the above embodiments. Thus, the motor possesses all the beneficial effects of the stator structure 100 of any of the above embodiments, exhibiting lower torque ripple and higher torque.

[0094] like Figure 4 As shown, the ninth embodiment of the present invention proposes a motor, which, based on the eighth embodiment, further includes:

[0095] like Figure 5 and Figure 6As shown, the rotor assembly 300 is disposed on the outer periphery of the stator assembly 200, and the stator structure 100 is disposed on the outer periphery of the rotor assembly 300; furthermore, a first air gap 400 is provided between the stator structure 100 and the rotor assembly 300, and a second air gap 500 is provided between the rotor assembly 300 and the stator assembly 200. In this way, the first air gap 400 and the second air gap 500 can be used to balance the reluctance and harmonic magnetic field, thereby achieving a balance in the reluctance and harmonic magnetic field of the entire motor.

[0096] Furthermore, in the radial direction of the stator structure 100, the size of the first air gap 400 is smaller than the size of the second air gap 500. This difference in size between the two air gaps allows for adjustment of the overall air gap magnetic flux density, thereby balancing the reluctance and harmonic magnetic field, ultimately achieving a balance between the reluctance and harmonic magnetic field of the entire motor. Specifically, the above effect is optimal when the ratio of the size of the first air gap 400 to the size of the second air gap 500 is greater than or equal to 0.03:3 and less than or equal to 0.1:3.

[0097] Furthermore, the stator structure 100 proposed in this invention does not involve a winding process during use. This design, while ensuring reduced torque ripple in the motor, does not increase the difficulty of motor assembly, especially the difficulty of the winding process, thereby ensuring that the cost of the motor using this stator structure 100 does not increase.

[0098] Furthermore, the present invention improves the stator structure 100 of the motor, which eliminates the need for windings 208 and permanent magnets 304. Therefore, compared to improvements to the rotor assembly in related technologies, the present invention does not impose more requirements on the structure of the permanent magnets 304, nor does it increase the assembly difficulty of the permanent magnets 304, thus ensuring that the cost of the motor with the stator structure 100 does not increase.

[0099] The tenth embodiment of the present invention proposes a motor, which, based on the ninth embodiment, further includes:

[0100] like Figure 4 As shown, the rotor assembly 300 includes a plurality of magnetic conductive blocks 302 and a plurality of permanent magnets 304. The plurality of magnetic conductive blocks 302 are spaced apart on the outer periphery of the stator assembly 200, and adjacent magnetic conductive blocks 302 are connected; the plurality of permanent magnets 304 are respectively disposed between adjacent magnetic conductive blocks 302; and the polarities of adjacent permanent magnets 304 are opposite, forming a magnetic focusing effect.

[0101] Furthermore, such as Figure 4 As shown, two adjacent magnetic blocks 302 can be connected by magnetic or non-magnetic components. Specifically, two adjacent magnetic blocks 302 are connected by a magnetic bridge.

[0102] Furthermore, such as Figure 4 As shown, the permanent magnet 304 can be configured as a built-in spoke-type magnet arrangement or a built-in V-shaped magnet arrangement. Specifically, the permanent magnet 304 can be configured as a built-in spoke-type magnet arrangement.

[0103] Specifically, the permanent magnet 304 can be made of ferrite.

[0104] The eleventh embodiment of the present invention proposes a motor, which, based on the ninth and tenth embodiments, further includes:

[0105] like Figure 4 As shown, the stator assembly 200 includes a stator core 202 and a winding 208. The stator core 202 includes a plurality of stator main teeth 204 spaced apart, and a stator slot 206 is formed between two adjacent stator main teeth 204; the winding 208 is wound around the stator main teeth 204 and located within the stator slot 206.

[0106] Furthermore, the number of magnetic conductors 302 (Zr), the number of stator slots 206 (Ns), and the number of pole pairs of winding 208 (Pa) satisfy: Pa=│Ns±Zr / 2│. In this way, the new harmonic components appearing in the air gap magnetic flux density can serve as the motor's operating harmonics, providing output torque and effectively improving the motor's torque density, thereby further enhancing the motor's efficiency.

[0107] In this embodiment, further, as Figure 4 As shown, winding 208 can be wound onto the tooth body of stator main teeth 204, or onto the yoke of stator main teeth 204. When winding 208 is wound onto the yoke of stator main teeth 204, the end of winding 208 is shortened, thus effectively balancing the contradiction between the excessive length of the end of winding 208 and the high winding factor of the motor. When winding 208 is wound onto the tooth body of stator main teeth 204, the winding difficulty of winding 208 can be reduced, and the improvement range of the motor can be decreased.

[0108] In this embodiment, further, as Figure 4 As shown, winding 208 is a concentrated winding, which facilitates winding and further improves the production efficiency of the motor.

[0109] In this embodiment, further, as Figure 4 As shown, the winding 208 spans only one stator tooth 204. In this embodiment, the outer diameter of the stator structure 100 is further larger than the outer diameter of the stator core 202. Specifically, the ratio of the outer diameter of the stator core 202 to the outer diameter of the stator structure 100 is 0.66.

[0110] In this embodiment, the electromagnetic winding 208 may further be made of aluminum wire.

[0111] In this embodiment, the stator core 202, stator structure 100, and magnetic block 302 are all made of laminated silicon steel sheets.

[0112] The twelfth embodiment of the present invention provides a motor, which, based on the ninth, tenth, and eleventh embodiments, further includes:

[0113] like Figure 4 As shown, the stator assembly 200 also includes at least two stator auxiliary teeth 210. These at least two stator auxiliary teeth 210 are disposed on the tooth shoes of the stator main teeth 204, and a groove 212 is formed between adjacent stator auxiliary teeth 210. Thus, the stator auxiliary teeth 210, in addition to serving as magnetic guiding components, can also function as modulation components to achieve magnetic field modulation. This differs from conventional permanent magnet motors used in related technologies (where the slot opening is smaller and the air gap permeability is close to a constant).

[0114] In the motor proposed in this invention, the stator main teeth 204 are split into at least two stator auxiliary teeth 210, introducing more harmonic components into the air gap magnetic permeability. This significantly improves the motor's performance. Furthermore, the motor has a simple structure, is easy to manufacture, does not significantly increase the motor's cost, and does not exhibit significant vibration or noise.

[0115] In this embodiment, further, as Figure 4 As shown, there is a slot 214 between the tooth shoes of adjacent stator main teeth 204, and the slot 214 is connected to the stator slot 206 to facilitate the winding of the winding 208. Furthermore, the size of the slot 214 is not equal to the size of the groove 212 in the circumferential direction of the stator core 202. By setting the sizes of the groove 212 and the slot 214 to be unequal, the uniformity of the stator auxiliary teeth 210 on all stator main teeth 204 in circumferential distribution can be changed, reducing the number of air gap magnetic permeability cycles. By reducing the number of air gap magnetic permeability cycles, the modulated magnetic flux density harmonic components will increase, thus generating more operating harmonics, further increasing the motor output torque.

[0116] The fourteenth embodiment of this invention proposes a motor, specifically a dual-air-gap permanent magnet motor. This motor can effectively reduce torque ripple without increasing additional costs.

[0117] Among them, such as Figure 4 As shown, the motor includes a stator structure 100, a stator assembly 200, and a rotor assembly 300. The stator core 202 of the stator structure 100 and the stator assembly 200 have different radial dimensions; furthermore, the stator structure 100 and the stator core 202 are centrally located, with the stator structure 100 serving as the outer stator and the stator core 202 serving as the inner stator. Figure 5 and Figure 6 As shown, the rotor assembly 300 is located between the stator structure 100 and the stator core 202, and a first air gap 400 (i.e., inner air gap) is formed between the rotor assembly 300 and the stator assembly 200, and a second air gap 500 (i.e., outer air gap) is formed between the stator structure 100 and the stator assembly 200.

[0118] Specifically, such as Figure 1 , Figure 2 and Figure 3 As shown, the stator structure 100 includes an annular portion 102 and salient poles 104. The salient poles 104 protrude from the inner peripheral wall of the annular portion 102. In the circumferential direction of the annular portion 102, there is a recess 106 between two adjacent salient poles 104. The stator structure 100 does not have windings 208. The stator core 202 of the stator assembly 200 is provided with windings 208.

[0119] Furthermore, the projected area of ​​the salient pole 104 along the axial direction of the annular portion 102 is greater than the cross-sectional area of ​​the salient pole 104. Specifically, as shown... Figure 1 and Figure 2 As shown, the salient pole 104 may be axially inclined relative to the annular portion 102; as Figure 3 As shown, the salient pole 104 can also be designed with axial segmentation in the annular portion 102. Furthermore, when the salient pole 104 is inclined relative to the axial direction of the annular portion 102, the salient pole 104 can extend continuously or in segments along the axial direction of the annular portion 102. Additionally, along the axial direction of the annular portion 102, the inclination directions of adjacent salient pole segments 104 relative to the axial direction of the annular portion 102 can be the same (in a straight line) or opposite (in a V-shape).

[0120] Furthermore, such as Figure 4 As shown, the rotor assembly 300 includes multiple magnetically conductive blocks 302 and multiple permanent magnets 304. The multiple permanent magnets 304 are respectively disposed between two adjacent magnetically conductive blocks 302, with the polarities of the two adjacent permanent magnets 304 opposite to each other, forming a magnetic focusing effect. Two adjacent magnetically conductive blocks 302 can be connected by magnetically conductive components or non-magnetically conductive components, and the magnets can be configured as a built-in spoke-type magnet arrangement or a built-in V-shaped magnet arrangement.

[0121] Furthermore, such as Figure 4 As shown, the number of magnetic blocks 302 (Zr), the number of stator slots 206 (Ns), and the number of pole pairs of winding 208 (Pa) satisfy: Pa=│Ns±Zr / 2│. In this way, the new harmonic components appearing in the air gap magnetic flux density can serve as the motor's operating harmonics, providing output torque and effectively improving the motor's torque density, further enhancing its efficiency.

[0122] Specifically, such as Figure 7As shown, when the extension direction of the salient pole 104 is inclined relative to the axial direction of the annular portion 102, when the inclination angle of the extension direction of the salient pole 104 relative to the axial direction of the annular portion 102 is 3°, the torque ripple of the motor can be reduced from 10.3% to 3.4%, and the average torque of the motor is not affected.

[0123] Therefore, the present invention improves the stator structure 100 of the motor by either setting the salient pole 104 at an axial angle relative to the annular portion 102, or designing the salient pole 104 in axial segments within the annular portion 102, with the salient poles 104 in different segments being staggered. This significantly improves the magnetic field regulation effect of the salient pole 104, resulting in lower torque ripple in the motor using this stator structure 100; and ensures that the torque of the motor using this stator structure 100 is not affected, thereby improving the smoothness of motor operation.

[0124] Furthermore, the stator structure 100 does not involve a winding process during use. This design, while ensuring reduced torque ripple in the motor, does not increase the difficulty of motor assembly, especially the difficulty of the winding process, thus ensuring that the cost of the motor using this stator structure 100 does not increase.

[0125] Furthermore, the stator structure 100 does not require windings 208 or permanent magnets 304. Therefore, compared to the modifications made to the rotor assembly in related technologies, this invention does not impose more requirements on the structure of the permanent magnets 304, nor does it increase the assembly difficulty of the permanent magnets 304, thus ensuring that the cost of the motor with the stator structure 100 does not increase.

[0126] The thirteenth embodiment of the present invention provides an electrical device including a motor as described in any of the above embodiments.

[0127] The electrical device proposed in this invention includes a motor as described in any of the above embodiments. Therefore, it possesses all the beneficial effects of the motor described above, which will not be discussed in detail here.

[0128] Specifically, the electrical equipment proposed in this invention can be products such as refrigerators, washing machines, and air conditioners.

[0129] 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.

[0130] 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.

[0131] 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 machine characterized in that, The motor comprises a stator structure, a rotor assembly and a stator assembly, the stator structure is arranged at the outer periphery of the rotor assembly, and the stator assembly is arranged at the inner side of the rotor assembly; The stator structure comprises: a circular ring part; a salient pole arranged at the inner peripheral wall of the circular ring part and extending along the axial direction of the circular ring part; The projection area of the salient pole in the axial direction of the circular ring part is greater than the cross-sectional area of the salient pole. The rotor assembly comprises: a plurality of magnetic conductive blocks distributed at intervals at the outer periphery of the stator assembly, and adjacent two magnetic conductive blocks are connected; a plurality of permanent magnets arranged between adjacent two magnetic conductive blocks, and the polarities of adjacent two permanent magnets are opposite. The stator assembly comprises: a stator core comprising a plurality of stator main teeth, and adjacent two stator main teeth have a stator slot therebetween; a winding arranged on the stator main tooth and located in the stator slot; The stator structure and the rotor assembly have a first air gap, and the rotor assembly and the stator assembly have a second air gap; In the radial direction of the stator structure, the size of the first air gap is smaller than the size of the second air gap; The ratio of the size of the first air gap to the size of the second air gap is greater than or equal to 0.03:3 and less than or equal to 0.1:

3.

2. The motor of claim 1, wherein The extension direction of the salient pole is arranged obliquely compared with the axial direction of the circular ring part.

3. The motor of claim 2, wherein In the axial direction of the circular ring part, the inner peripheral wall of the circular ring part is provided with a section of the salient pole.

4. The motor of claim 2, wherein In the axial direction of the circular ring part, the inner peripheral wall of the circular ring part is provided with at least two sections of the salient pole.

5. The motor of claim 4, wherein In the axial direction of the circular ring part, the oblique directions of adjacent two sections of the salient pole are the same or opposite compared with the axial direction of the circular ring part.

6. The motor of claim 1, wherein In the axial direction of the circular ring part, the inner peripheral wall of the circular ring part is provided with at least two sections of the salient pole, and adjacent two sections of the salient pole are distributed in a staggered manner.

7. The motor of claim 6, wherein At least one section of the salient pole extends along the axial direction of the circular ring part.

8. The motor of any one of claims 1 to 7, wherein In the circumferential direction of the circular ring part, the inner peripheral wall of the circular ring part is provided with at least two salient poles, and adjacent two salient poles have a recess therebetween.

9. The motor of claim 1, wherein The number of the magnetic conductive blocks Zr, the number of the stator slots Ns and the number of pole pairs of the winding Pa satisfy: Pa=│Ns±Zr / 2│.

10. The electric machine of claim 9, wherein, The stator assembly further comprises: at least two stator secondary teeth arranged at the tooth shoes of the stator main teeth, and adjacent two stator secondary teeth have a groove therebetween.

11. The motor of claim 10, wherein The tooth gap between the adjacent stator main teeth has a notch, which is communicated with the stator slot, and the size of the notch is different from the size of the groove in the circumferential direction of the stator core.

12. The electric machine of any one of claims 9 to 11, wherein, The winding is wound on the tooth body of the stator main tooth, or wound on the yoke of the stator main tooth; and / or The winding is a concentrated winding.

13. An electrical appliance characterized by Comprising: The electric machine of any one of claims 1 to 12.

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