Motors and electrical equipment

Abstract

The present invention proposes a motor and electrical equipment, wherein the motor includes: a first stator, a rotor, and a second stator. The rotor is located between the first and second stators, and the first stator is located outside the rotor. The first stator includes a first stator yoke and first stator teeth. The first stator teeth are provided with first grooves on the side facing the rotor. In the motor proposed by the present invention, the first stator includes a first stator yoke and a plurality of first stator teeth disposed on the first stator yoke. Adjacent first stator teeth form first stator slots. The first stator teeth are provided with first grooves on the side facing the rotor. The first grooves separate the first stator teeth into a plurality of first auxiliary teeth. The first grooves are then used to adjust the air gap between the first stator teeth and the rotor, modulate the magnetic field, and improve the efficiency of the motor.

Description

Technical Field

[0001] The present invention relates to the technical field of motors, and in particular to a motor and an electrical device. Background Art

[0002] Due to limitations in materials like silicon steel and permanent magnets, traditional permanent magnet motors (PMMs) have struggled to significantly increase their torque. To further improve torque density, dual-stator vernier PMMs are gaining increasing attention. However, the stator teeth in these motors are typically uniform and complete, resulting in relatively low torque. Summary of the Invention

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

[0004] To this end, a first aspect of the present invention provides an electric motor.

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

[0006] In view of this, according to a first aspect of the present invention, the present invention proposes a motor, comprising: a first stator, the first stator comprising a first stator yoke and first stator teeth, the first stator teeth being arranged on the first stator yoke, the number of the first stator teeth being multiple, and first stator slots being formed between adjacent first stator teeth; a rotor, being passed through the inner side of the first stator; and a second stator, being passed through the inner side of the rotor, wherein a first groove is provided on the side of the first stator teeth facing the rotor.

[0007] The motor proposed in the present invention includes: a first stator, a rotor and a second stator. Along the axial direction of the first stator, the rotor is arranged on the inner side of the first stator, and along the axial direction of the rotor, the second stator is arranged on the inner side of the rotor. The rotor is located between the first stator and the second stator. Therefore, the first stator and the rotor can be regarded as a motor system, and the second stator and the rotor can be regarded as a motor system, thereby improving the torque density of the entire motor and improving the motor efficiency.

[0008] In addition, the first stator includes a first stator yoke and a plurality of first stator teeth arranged on the first stator yoke, adjacent first stator teeth form a first stator slot, and a first groove is provided on the side of the first stator tooth facing the rotor. The first groove separates the first stator tooth into a plurality of first sub-teeth, and then the first groove is used to adjust the air gap between the first stator tooth and the rotor, modulate the magnetic field, and improve the efficiency of the motor.

[0009] Specifically, the cross-sectional area of the first groove is the same as or different from the cross-sectional area of the first stator slot, and thus the cross-sectional areas of the two adjacent slots of the first stator facing the rotor are different, thereby forming different air gap magnetic densities, thereby reducing the harmonic magnetic field, improving the stability of the motor, and reducing the vibration of the motor.

[0010] In addition, the motor in the above technical solution provided by the present invention may also have the following additional technical features:

[0011] On the basis of the above technical solution, the second stator further includes: a second stator yoke; second stator teeth, which are arranged on the second stator yoke, and the number of second stator teeth is multiple, and second stator slots are formed between adjacent second stator teeth, and a second groove is provided on the side of the second stator teeth facing the rotor.

[0012] In this technical solution, the second stator includes a second stator yoke and a plurality of second stator teeth arranged on the second stator yoke. Adjacent second stator teeth form second stator slots. A second groove is provided on the side of the second stator teeth facing the rotor. The second groove separates the second stator teeth into a plurality of second auxiliary teeth. The second groove is then used to adjust the air gap between the second stator teeth and the rotor, modulate the magnetic field, and improve the efficiency of the motor.

[0013] On the basis of any of the above technical solutions, further, the ratio of the total cross-sectional area of all the first stator slots to the total cross-sectional area of all the first grooves ranges from 1 to 80.

[0014] In this technical solution, the ratio of the sum of the cross-sectional areas of all the first stator slots, that is, the total cross-sectional area of all the first stator slots, to the sum of the cross-sectional areas of all the first grooves, that is, the total cross-sectional area of all the first grooves, is greater than or equal to 1 and less than or equal to 80. Thus, by limiting the areas of the first stator slots and the first grooves, the air gap is adjusted. Moreover, the area of the first groove is not greater than the area of the first stator slot, thereby ensuring the winding amount of the first stator slot, avoiding the instability of the first stator due to the first stator slot being too small, thereby balancing the efficiency and vibration of the motor.

[0015] On the basis of any of the above technical solutions, further, the slot opening of the first stator slot faces the rotor, and the slot opening of the second stator slot faces the rotor.

[0016] In this technical solution, the first stator slot faces the rotor, thereby improving the air gap and increasing the torque applied to the rotor.

[0017] On the basis of any of the above technical solutions, further, 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.

[0018] In this technical solution, the first stator and the rotor are spaced apart to form a first air gap, and the second stator and the rotor are spaced apart to form a second air gap, thereby forming a double air gap structure, which can improve the torque of the motor.

[0019] On the basis of any of the above technical solutions, further, the thickness of the first air gap and the thickness of the second air gap are in the range of 0.05 mm to 3 mm.

[0020] In this technical solution, the thickness of the first air gap and the thickness of the second air gap range from 0.05 mm to 3 mm. The thickness of the first air gap and the thickness of the second air gap may be the same or different. By adjusting the air gap of the above thickness, the overall air gap magnetic density is adjusted to balance the magnetic resistance and harmonic magnetic field, thereby achieving a balance in the magnetic resistance and harmonic magnetic field of the entire motor.

[0021] On the basis of any of the above technical solutions, further, the ratio of the average diameter of the second air gap to the average diameter of the first air gap ranges from 0.1 to 0.95.

[0022] In this technical solution, the ratio of the average diameter of the second air gap to the average diameter of the first air gap indirectly determines the outer and inner diameters of the rotor, thereby adjusting the overall motor structure and the distance between the first and second air gaps, thereby regulating the magnetic field and increasing the torque per unit volume. This effect is optimal when the ratio of the average diameter of the second air gap to the average diameter of the first air gap is greater than or equal to 0.1 and less than or equal to 0.95.

[0023] On the basis of any of the above technical solutions, further, the angle between the center lines of adjacent first stator slots and the center lines of second stator teeth is less than or equal to 45°÷Ns2, where Ns2 represents the number of second stator slots.

[0024] In this technical solution, the number of second stator slots is Ns2, and the angle between the center lines of adjacent first stator slots and the center lines of the second stator teeth is less than or equal to 45°÷Ns2, thereby forming a form in which the second stator teeth correspond to the first stator slots and the first stator teeth correspond to the second stator slots, thereby adjusting the magnetic field formed by the first stator and the second stator, reducing the harmonic magnetic field, reducing pulsation, and reducing the vibration of the rotor.

[0025] On the basis of any of the above technical solutions, further, the number of the first stator slots and the number of the second stator slots are equal, both are Na, the average diameter of the first air gap is d1, the average diameter of the second air gap is d2, the width of the first stator tooth is 3.14×k1×d1÷Na, and the width of the second stator tooth is k2×d2÷Na, wherein k1 represents the proportion of all the first stator teeth on the circumference, k2 represents the proportion of all the second stator teeth on the circumference, 0.1 <k1<0.8,0.1<k2<0.8。

[0026] In this technical solution, the number of the first stator slots is equal to that of the second stator slots, both being Na, which makes the entire magnetic field of the motor more regular, thereby improving the torque of the motor.

[0027] Moreover, the average diameter of the first air gap between the first stator and the rotor is d1, so the width of the first stator teeth is 3.14×k1×d1÷Na, where 0.1 < k1 < 0.8. Thus, the number, width of the first stator teeth, and the average diameter of the first air gap in the first stator satisfy certain parameters, which can limit the size of the first stator slot opening, thereby adjusting the magnetic field distribution of the first stator yoke and the first stator teeth, reducing the loss of the motor, improving the motor efficiency. Also, it can adjust the torque ripple and improve the motor efficiency.

[0028] The average diameter of the second air gap between the second stator and the rotor is d2, so the width of the second stator teeth is k2×d2÷Na, where 0.1 < k2 < 0.8. Thus, the number, width of the second stator teeth, and the average diameter of the second air gap in the second stator satisfy certain parameters, which can limit the size of the second stator slot opening, thereby adjusting the magnetic field distribution of the second stator yoke and the first stator teeth, reducing the loss of the motor, improving the motor efficiency. Also, it can adjust the torque ripple and improve the motor efficiency.

[0029] Based on any of the above technical solutions, further, the rotor includes: a plurality of magnetic conductive parts; a plurality of magnetic parts, and the magnetic conductive parts and the magnetic parts are spliced into an annular structure along the ring, and the magnetic parts are arranged between adjacent magnetic conductive parts. The value range of the ratio of the total volume of the magnetic parts to the total volume of the magnetic conductive parts is: 0.6 to 6.

[0030] In this technical solution, the rotor includes a magnetic conductive part and a magnetic part. The magnetic part is arranged on the magnetic conductive part. The ratio of the total volume of the magnetic part to the total volume of the magnetic conductive part is greater than or equal to 0.6 and less than or equal to 6, which ensures the overall volume of the magnetic part, thereby ensuring the magnetic field strength of the rotor, improving the torque of the motor, and improving the motor efficiency.

[0031] Based on any of the above technical solutions, further, a first winding is arranged on the first stator; and / or a second winding is arranged on the second stator.

[0032] In this technical solution, the motor further includes a first winding wound around the first stator yoke or the first stator teeth, so that a magnetic field is formed when the first winding is energized to drive the rotor to rotate.

[0033] The motor further includes a second winding wound around the second stator yoke or the second stator teeth, so that a magnetic field is formed when the second winding is energized to drive the rotor to rotate.

[0034] On the basis of any of the above technical solutions, further, the number of magnetic conductive parts is Zr, the number of first stator slots is Ns1, the number of pole pairs of the first winding on the first stator is Pa1, Pa1 = |Ns1±Zr÷2|; and / or the number of magnetic conductive parts is Zr, the number of second stator slots is Ns2, the number of pole pairs of the second winding on the second stator is Pa2, Pa2 = |Ns2±Zr÷2|.

[0035] In this technical solution, the number of magnetic conductive parts is Zr, the number of stator slots of the first stator is Ns1, and the number of pole pairs of a winding is Pa1, Pa1 = |Ns1±Zr÷2|. By adjusting the number of first stator teeth, the number of pole pairs of the first winding and the number of magnetic conductive parts, the motor is made more stable and the torque of the motor is improved.

[0036] The number of magnetic conductive parts is Zr, the number of stator slots of the second stator is Ns2, and the number of pole pairs of the second winding is Pa2, Pa2 = |Ns2±Zr÷2|. By adjusting the number of second stator teeth, the number of pole pairs of the second winding and the number of magnetic conductive parts, the motor is made more stable and the torque of the motor is improved.

[0037] On the basis of any of the above technical solutions, further, the ratio of the axial length of the first stator to the outer diameter of the first stator is less than or equal to 1.6÷Pa1, where Pa1 is the number of pole pairs of the first winding on the first stator.

[0038] In this technical solution, the ratio of the axial length to the outer diameter of the first stator is reduced, and the pole pair number of the first stator is usually an integer greater than 1, thereby reducing the axial length of the first stator and reducing the volume of the first stator, making the motor compact and helping to reduce the volume of the motor.

[0039] On the basis of any of the above technical solutions, further, the ratio of the axial length of the second stator to the outer diameter of the second stator is less than or equal to 12÷Pa2÷(K2+1), the number of pole pairs of the second winding on the second stator is Pa2, and K2 is the number of second grooves on a second stator tooth.

[0040] In this technical solution, the ratio of the axial length to the outer diameter of the second stator structure is reduced, the pole pair number of the second stator structure is usually an integer greater than 1, and the number of second stator teeth is usually an integer greater than 2, thereby reducing the axial length of the second stator structure and reducing the volume of the second stator, making the motor compact and helping to reduce the volume of the motor.

[0041] According to a second aspect of the present invention, the present invention proposes an electrical device, comprising: a motor as proposed in any one of the above technical solutions.

[0042] The electrical device proposed in the present invention includes the motor proposed in any one of the above technical solutions, and therefore has all the beneficial effects of the motor proposed in any one of the above technical solutions, which will not be listed one by one here.

[0043] Additional aspects and advantages of the invention will become apparent from the description which follows, or may be learned by practice of the invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of the embodiments with reference to the accompanying drawings, in which:

[0045] Figure 1 A partial structural schematic diagram of a motor provided by one embodiment of the present invention is shown;

[0046] Figure 2 A partial structural schematic diagram of a motor provided by one embodiment of the present invention is shown;

[0047] Figure 3 A partial structural schematic diagram of a motor provided by one embodiment of the present invention is shown;

[0048] Figure 4 A partial structural schematic diagram of a motor provided by one embodiment of the present invention is shown;

[0049] Figure 5 A partial structural schematic diagram of a motor provided by one embodiment of the present invention is shown;

[0050] Figure 6 A partial structural schematic diagram of a motor provided by one embodiment of the present invention is shown;

[0051] Figure 7 A partial structural schematic diagram of a motor provided by one embodiment of the present invention is shown;

[0052] Figure 8 A partial structural schematic diagram of a motor provided by one embodiment of the present invention is shown;

[0053] Figure 9 A partial structural schematic diagram of a motor provided by one embodiment of the present invention is shown;

[0054] Figure 10 A partial structural schematic diagram of a motor provided by one embodiment of the present invention is shown;

[0055] Figure 11 A partial structural schematic diagram of a motor provided by one embodiment of the present invention is shown;

[0056] Figure 12 A partial schematic diagram of a motor provided by one embodiment of the present invention is shown;

[0057] Figure 13 A schematic diagram showing a partial structure of a first stator in a motor provided by one embodiment of the present invention is shown;

[0058] Figure 14 A comparison diagram of torque density of a motor provided by an embodiment of the present invention and a motor in related art is shown when the ratio of the axial length to the diameter of the first stator is different.

[0059] in, Figures 1 to 13 The corresponding relationship between the reference numerals and component names is as follows:

[0060] 100 motor, 110 first stator, 112 first stator yoke, 114 first stator tooth, 116 first stator slot, 118 first winding, 122 first salient pole, 124 first auxiliary tooth, 126 first slot, 130 rotor, 132 magnetic member, 134 magnetic conductive portion, 140 second stator, 142 second stator yoke, 144 second stator tooth, 146 second stator slot, 148 second winding, 152 second salient pole, 154 second auxiliary tooth, 156 second slot, 160 first air gap, 170 second air gap. DETAILED DESCRIPTION

[0061] In order to more clearly understand the above-mentioned objects, features and advantages of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that, in the absence of conflict, the embodiments of the present application and the features therein can be combined with each other.

[0062] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present invention is not limited to the specific embodiments disclosed below.

[0063] Refer to the following Figures 1 to 14 The motor 100 and the electrical equipment provided according to some embodiments of the present invention are described.

[0064] Example 1:

[0065] like Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 、 Figure 6 、 Figure 7 、 Figure 8 、 Figure 9 and Figure 10As shown, the present invention provides a motor 100, including: a first stator 110, a rotor 130 and a second stator 140, the first stator 110 is provided with a first mounting hole, the rotor 130 is provided with a second mounting hole, the rotor 130 is passed through the first mounting hole, and the second stator 140 is passed through the second mounting hole.

[0066] The first stator 110 includes a first stator yoke 112 and a first stator tooth 114, wherein the first stator yoke 112 is an annular structure, the first stator tooth 114 is arranged on the inner ring or outer ring of the first stator yoke 112, and the number of the first stator teeth 114 is multiple, and a first stator slot 116 is formed between adjacent first stator teeth 114, and a first groove 126 is provided on the side of the first stator tooth 114 facing the rotor 130. Specifically, the number of the first grooves 126 can be one or more, for example: two, three or four, etc.

[0067] The motor 100 provided by the present invention includes: a first stator 110, a rotor 130 and a second stator 140. Along the axial direction of the first stator 110, the rotor 130 is arranged on the inner side of the first stator 110, and along the axial direction of the rotor, the second stator 140 is arranged on the inner side of the rotor 130. The rotor 130 is located between the first stator 110 and the second stator 140. Therefore, the first stator 110 and the rotor 130 can be regarded as a set of motor 100 systems, and the second stator 140 and the rotor 130 can be regarded as a set of motor 100 systems, thereby improving the torque density of the entire motor 100 and improving the efficiency of the motor 100.

[0068] In addition, the first stator 110 includes a first stator yoke 112 and a plurality of first stator teeth 114 arranged on the first stator yoke 112. Adjacent first stator teeth 114 form a first stator slot 116. A first groove 126 is provided on the side of the first stator tooth 114 facing the rotor 130. The first groove 126 separates the first stator tooth 114 into a plurality of first auxiliary teeth 124. The first groove 126 is then used to adjust the air gap between the first stator tooth 114 and the rotor 130, modulate the magnetic field, and improve the efficiency of the motor 100.

[0069] Specifically, the cross-sectional area of the first groove 126 is the same as or different from the cross-sectional area of the first stator slot 116 , and thus the cross-sectional areas of the two adjacent slots of the first stator 110 facing the rotor 130 are different, thereby forming different air gap magnetic densities, thereby reducing the harmonic magnetic field, improving the stability of the motor 100, and reducing the vibration of the motor 100.

[0070] Example 2:

[0071] like Figure 10As shown, on the basis of Example 1, further, the second stator 140 includes a second stator yoke 142 and a second stator tooth 144, wherein the second stator yoke 142 is an annular structure, the second stator teeth 144 are arranged on the inner ring or outer ring of the second stator yoke 142, and the number of the second stator teeth 144 is multiple, and a second stator slot 146 is formed between adjacent second stator teeth 144, and a second groove 156 is provided on the side of the second stator tooth 144 facing the rotor 130. Specifically, the number of the second grooves 156 can be one or more, for example: two, three or four, etc.

[0072] In this embodiment, the second stator 140 includes a second stator yoke 142 and a plurality of second stator teeth 144 arranged on the second stator yoke 142. Adjacent second stator teeth 144 form second stator slots 146. A second groove 156 is provided on the side of the second stator teeth 144 facing the rotor 130. The second groove 156 separates the second stator teeth 144 into a plurality of second auxiliary teeth 154. The second groove 156 is then used to adjust the air gap between the second stator teeth 144 and the rotor 130, modulate the magnetic field, and improve the efficiency of the motor 100.

[0073] Specifically, the cross-sectional area of the second groove 156 is different from the cross-sectional area of the second stator slot 146 .

[0074] In this embodiment, the cross-sectional area of the second groove 156 is different from the cross-sectional area of the second stator slot 146 , and thus the cross-sectional areas of the two adjacent slots of the second stator 140 facing the rotor 130 are different, thereby forming different air gap magnetic densities, thereby reducing the harmonic magnetic field, improving the stability of the motor 100, and reducing the vibration of the motor 100.

[0075] Example 3:

[0076] On the basis of Example 2, further, a ratio Karea of the total cross-sectional area of all first stator slots 116 to the total cross-sectional area of all first grooves 126 has a value range of greater than or equal to 1 and less than or equal to 80.

[0077] In this embodiment, the ratio Karea of the sum of the cross-sectional areas of all the first stator slots 116, that is, the total cross-sectional area of all the first stator slots 116, and the sum of the cross-sectional areas of all the first grooves 126, that is, the total cross-sectional area of all the first grooves 126 is greater than or equal to 1 and less than or equal to 80.

[0078] Furthermore, by limiting the areas of the first stator slot 116 and the first groove 126 , the air gap is adjusted. Moreover, the area of the first groove 126 is not larger than the area of the first stator slot 116 , thereby ensuring the winding amount of the first stator slot 116 and avoiding the first stator 110 being unstable due to the first stator slot 116 being too small, thereby balancing the efficiency of the motor 100 and improving the output power of the motor.

[0079] Among them, when the cross-sectional area of the first groove 126 is different from the cross-sectional area of the first stator slot 116, the cross-sectional areas of the two adjacent slots of the first stator 110 facing the rotor 130 are different, thereby forming different air gap magnetic densities, thereby reducing the harmonic magnetic field, improving the stability of the motor 100, and reducing the vibration of the motor 100.

[0080] Among them, Figure 13 As shown, on a cross section perpendicular to the axis of the first stator 110, an auxiliary circle R1 is made with the axis of the first stator 110 as the center and the inner diameter of the first stator 110 as the diameter. The auxiliary circle R1 closes the slot opening of the first stator slot 116 and the slot opening of the first groove 126, thereby obtaining the closed shape of the first stator slot 116 and the closed shape of the first groove 126. The area of a closed first stator slot 116 is S1, and the area of a closed first groove 126 is S2. Therefore, if a The number of first stator slots 116 on the first stator 110 is Ns4, the number of first stator teeth 114 on one first stator 110 is also Ns4, the number of first grooves 126 on one first stator tooth 114 is k4, and the total cross-sectional area of all the first stator slots 116 is Ns4×S1, and the total cross-sectional area of all the first grooves 126 is Ns4×k4×S2. Therefore, Ns4×S1 and Ns4×k4×S2 satisfy: 1≤(Ns4×S1)÷(Ns4×k4×S2)≤80.

[0081] Specifically, as shown in Table 1 below, the torque and output power of the motor provided by the present invention and related technologies are shown.

[0082] Table 1

[0083] Karea 0.5 17 100 <![CDATA[Volume (cm 3 )]]> 137 137 137 Input current (A) 0.2 0.2 0.2 Torque (Nm) 0.28 0.45 0.2 Speed (rpm) 1000 1000 1000 Output power (W) 29.3 47.1 20.9

[0084] Among them, except Karea, the other motor parameters are the same.

[0085] As shown in Table 1, the ratio of the total cross-sectional area of all first stator slots 116 to the total cross-sectional area of all first grooves 126 is 17, and the effective volume of the motor 100 is 137 cm 3, input current is 0.2A, torque is 0.45Nm, speed is 1000rpm, and output power is 47.1W.

[0086] In the motor of the related art, the ratio of the total cross-sectional area of all first stator slots to the total cross-sectional area of all first grooves is 0.5, and the effective volume of the motor is 137 cm 3 , input current is 0.2A, torque is 0.28Nm, speed is 1000rpm, and output power is 29.3W.

[0087] In the motor of the related art, the ratio of the total cross-sectional area of all first stator slots to the total cross-sectional area of all first grooves is 100, and the effective volume of the motor is 137 cm 3 , input current is 0.2A, torque is 0.2Nm, speed is 1000rpm, and output power is 20.9W.

[0088] In comparison, the torque and output power of the motor provided by the present invention are significantly higher than those of the motor in the related art.

[0089] Example 4:

[0090] like Figures 1 to 10 As shown, based on any one of Embodiments 1 to 3, further, the slot opening of the first stator slot 116 faces the rotor 130 .

[0091] In this embodiment, the first stator slots 116 face the rotor 130 , thereby improving the air gap and increasing the torque applied to the rotor 130 .

[0092] Example 5:

[0093] like Figures 1 to 10 As shown, based on any one of Embodiments 1 to 3, further, the slot opening of the second stator slot 146 faces the rotor 130 .

[0094] In this embodiment, the second stator slots 146 face the rotor 130 , thereby improving the air gap and increasing the torque applied to the rotor 130 .

[0095] Example 6:

[0096] like Figures 1 to 10 As shown, based on any one of Embodiments 1 to 3, further, the slot opening of the first stator slot 116 faces the rotor 130 , and the slot opening of the second stator slot 146 faces the rotor 130 .

[0097] In this embodiment, the first stator slots 116 face the rotor 130 , thereby improving the air gap and increasing the torque applied to the rotor 130 . The second stator slots 146 face the rotor 130 , thereby improving the air gap and increasing the torque applied to the rotor 130 .

[0098] Example 7:

[0099] like Figure 12 As shown, on the basis of any one of Embodiments 1 to 6, further, a first air gap 160 is formed between the first stator 110 and the rotor 130 , and a second air gap 170 is formed between the second stator 140 and the rotor 130 .

[0100] In this embodiment, the first stator 110 and the rotor 130 are spaced apart to form a first air gap 160 , and the second stator 140 and the rotor 130 are spaced apart to form a second air gap 170 , thereby forming a double air gap structure, which can improve the torque of the motor 100 .

[0101] Example 8:

[0102] like Figure 12 As shown, based on Example 7, further, the ratio of the average diameter d2 of the second air gap 170 to the average diameter d1 of the first air gap 160 is greater than or equal to 0.1 and less than or equal to 0.95. That is, 0.1≤d2÷d1≤0.95.

[0103] In this embodiment, the ratio of the average diameter of the second air gap 170 to the average diameter of the first air gap 160 indirectly defines the inner and outer diameters of the rotor 130, thereby adjusting the structure of the entire motor 100 and the distance between the first air gap 160 and the second air gap 170, thereby adjusting the magnetic field and increasing the torque per unit volume. This effect is optimal when the ratio of the average diameter of the second air gap 170 to the average diameter of the first air gap 160 is greater than or equal to 0.1 and less than or equal to 0.95.

[0104] Specifically, the ratio of the average diameter d2 of the second air gap 170 to the average diameter d1 of the first air gap 160 is equal to or greater than 0.3 and less than or equal to 0.95, that is, 0.3≤d2÷d1≤0.95.

[0105] Specifically, as shown in Table 2 below, the ratio of d2 to d1 of the motor provided by the present invention is shown, and the torque and output power of different values between 0.1 and 0.95 are shown.

[0106] Table 2

[0107] d2÷d1 0.3 0.75 0.9 <![CDATA[Volume (cm 3 )]]> 137 137 137 Input current (A) 0.2 0.2 0.2 Torque (Nm) 0.23 0.45 0.3 Speed (rpm) 1000 1000 1000 Output power (W) 24.1 47.1 31.4

[0108] Among them, except the ratio of d2 to d1, other motor parameters are the same.

[0109] As shown in Table 2, the ratio of the average diameter d2 of the second air gap 170 to the average diameter d1 of the first air gap 160 of the motor 100 provided by the present invention is 0.3, and the effective volume of the motor 100 is 137 cm 3 , input current is 0.2A, torque is 0.23Nm, speed is 1000rpm, and output power is 24.1W.

[0110] The motor 100 provided by the present invention has a ratio of the average diameter d2 of the second air gap 170 to the average diameter d1 of the first air gap 160 of 0.75, and an effective volume of the motor 100 is 137 cm 3 , input current is 0.2A, torque is 0.45Nm, speed is 1000rpm, and output power is 47.1W.

[0111] The motor 100 provided by the present invention has a ratio of the average diameter d2 of the second air gap 170 to the average diameter d1 of the first air gap 160 of 0.9, and an effective volume of the motor 100 is 137 cm 3 , input current is 0.2A, torque is 0.3Nm, speed is 1000rpm, and output power is 31.4W.

[0112] Example 9:

[0113] like Figure 12 As shown, on the basis of Example 7 or Example 8, further, the thickness of the first air gap 160 and the thickness of the second air gap 170 are in the range of 0.05 mm to 3 mm, and the thickness of the first air gap 160 and the thickness of the second air gap 170 may be the same or different. By adjusting the air gap of the above thickness, the overall air gap magnetic density is adjusted to balance the magnetic resistance and the harmonic magnetic field, thereby achieving a balance between the magnetic resistance and the harmonic magnetic field of the entire motor 100.

[0114] Specifically, the thickness d3 of the first air gap 160 and the thickness d4 of the second air gap 170 may be equal or different.

[0115] Specifically, as shown in Table 3 below, the output power of the motor provided by the present invention and the motor in related technologies is shown.

[0116] The first air gap 160 and the second air gap 170 have the same thickness, which is a gap.

[0117] Among them, except gap, other motor parameters are the same.

[0118] Table 3

[0119] gap 0.03mm 0.4mm 4mm <![CDATA[Volume (cm 3 )]]> 137 137 137 Input current (A) 0.2 0.2 0.2 Torque (Nm) 0.6 0.45 0.15 Speed (rpm) 1000 1000 1000 Output power (W) 62.8 47.1 15.7

[0120] As shown in Table 3, the thickness gap between the first air gap 160 and the second air gap 170 of the motor 100 provided by the present invention is 0.4 mm, and the effective volume of the motor 100 is 137 cm 3 , input current is 0.2A, torque is 0.45Nm, speed is 1000rpm, and output power is 47.1W.

[0121] In the motor of the related art, the thickness gap between the first air gap and the second air gap is 0.03 mm, and the effective volume of the motor is 137 cm 3 , input current is 0.2A, torque is 0.6Nm, speed is 1000rpm, and output power is 62.8W. However, this air gap requires too high precision for the motor, which increases the production cost of the motor. In addition, the small air gap in this state can easily cause collision between the rotor 130 and the first stator or the second stator, thereby affecting the stability of the motor.

[0122] In the motor of the related art, the thickness gap between the first air gap and the second air gap is 4 mm, and the effective volume of the motor is 137 cm 3 , input current is 0.2A, torque is 0.15Nm, speed is 1000rpm, and output power is 15.7W. In comparison, the torque and output power of the motor provided by the present invention are significantly higher than those of the motor in the related art, and the cost is also lower.

[0123] Example 10:

[0124] like Figure 11 As shown, based on any one of Examples 1 to 9, further, the number of second stator slots 146 is Ns2, and the angle γ between the center line H1 of adjacent first stator slots 116 and the center line H2 of the second stator tooth 144 is less than or equal to 45°÷Ns2.

[0125] In this embodiment, the number of second stator slots 146 is Ns2, and the angle γ between the center line H1 of adjacent first stator slots 116 and the center line H2 of the second stator tooth 144 is less than or equal to 45°÷Ns2, thereby forming a form in which the second stator teeth 144 correspond to the first stator slots 116, and the first stator teeth 114 correspond to the second stator slots 146, thereby adjusting the magnetic field formed by the first stator 110 and the second stator 140, reducing the harmonic magnetic field, reducing pulsation, reducing the vibration of the rotor 130, and improving the torque, output power and efficiency of the motor.

[0126] Specifically, as shown in Table 4 below, the torque, output power, and efficiency of the motor provided by the present invention and related technologies when γ takes different values, where Ns2 is equal to 12 as an example.

[0127] Table 4

[0128] γ -4° 0° 4° Copper consumption (W) 4.4 4.4 4.4 Iron loss (W) 4.95 4.14 2.84 Torque (Nm) 0.36 0.41 0.37 Output power (W) 37.81 43.15 39.18 Input power (W) 47.2 51.7 46.4 efficiency 80.14％ 83.44％ 84.37％

[0129] Among them, except for γ, other motor parameters are the same.

[0130] As shown in Table 4, for the motor 100 provided by the present invention, the included angle γ between the center line H1 of the first stator slot 116 and the center line H2 of the second stator tooth 144 is equal to 0°. The copper loss of the motor 100 is 4.4 W, the iron loss is 4.14 W, the torque is 0.41 Nm, the output power is 43.15 W, the input power is 51.7 W, and the efficiency is 83.44%.

[0131] For the motor in the related art, the included angle γ between the center line H1 of the first stator slot and the center line H2 of the second stator tooth is equal to -4°. The copper loss of the motor is 4.4 W, the iron loss is 4.95 W, the torque is 0.36 Nm, the output power is 37.81 W, the input power is 47.2 W, and the efficiency is 80.14%.

[0132] For the motor in the related art, the included angle γ between the center line H1 of the first stator slot and the center line H2 of the second stator tooth is equal to 4°. The copper loss of the motor is 4.4 W, the iron loss is 2.84 W, the torque is 0.37 Nm, the output power is 39.18 W, the input power is 46.4 W, and the efficiency is 84.37%.

[0133] In comparison, for the motor provided by the present invention, the torque and output power are significantly higher than those of the motors in the related art.

[0134] Embodiment 11:

[0135] On the basis of any one of Embodiments 1 to Embodiment 10, further, the number of the first stator slots 116 is Na, the average diameter of the first air gap 160 is d1, and the width of the first stator tooth 114 is 3.14×k1×d1÷Na, where 0.1 < k1 < 0.8.

[0136] In this embodiment, the number of the first stator slots 116 is Na, and the average diameter of the first air gap 160 between the first stator 110 and the rotor 130 is d1. Thus, the width of the first stator tooth 114 is 3.14×k1×d1÷Na, 0.1 < k1 < 0.8. Furthermore, the number, width of the first stator tooth 114, and average diameter of the first air gap 160 in the first stator 110 satisfy certain parameters, and then the size of the slot opening of the first stator slot 116 can be defined, thereby adjusting the magnetic field distribution of the first stator yoke 112 and the first stator tooth 114, reducing the loss of the motor 100, improving the efficiency of the motor 100, and moreover, the torque ripple can be adjusted to improve the efficiency of the motor 100.

[0137] Among them, k1 represents the occupancy ratio of all the first stator teeth in the circumference, and 0.1 < k1 < 0.8.

[0138] Embodiment 12:

[0139] On the basis of any one of Embodiments 1 to 10, further, the number of the second stator slots 146 is Na, the average diameter between the second air gaps 170 is d2, and the width of the second stator teeth 144 is k2×d2÷Na, where 0.1 < k2 < 0.8.

[0140] In this embodiment, the number of the second stator slots 146 is Na, the average diameter of the second air gap 170 between the second stator 140 and the rotor 130 is d2, so that the width of the second stator teeth 144 is k2×d2÷Na, 0.1 < k2 < 0.8. Furthermore, the number, width of the second stator teeth 144 and the average diameter of the second air gap 170 in the second stator 140 satisfy certain parameters, and then the size of the notch of the second stator slot 146 can be defined, thereby adjusting the magnetic field distribution of the second stator yoke 142 and the first stator teeth 114, reducing the loss of the motor 100, improving the efficiency of the motor 100, and also adjusting the torque ripple and improving the efficiency of the motor 100.

[0141] Among them, k2 represents the occupancy ratio of all the second stator teeth in the circumference, and 0.1 < k2 < 0.8.

[0142] Embodiment 13:

[0143] On the basis of any one of Embodiments 1 to 10, further, the number of the first stator slots 116 is Na, the average diameter of the first air gap 160 is d1, the width of the first stator teeth 114 is 3.14×k1×d1÷Na, where 0.1 < k1 < 0.8, and the number of the second stator slots 146 is Na, the average diameter between the second air gaps 170 is d2, and the width of the second stator teeth 144 is k2×d2÷Na, 0.1 < k2 < 0.8.

[0144] In this embodiment, the number of the first stator slots 116 is Na, the average diameter of the first air gap 160 between the first stator 110 and the rotor 130 is d1, so that the width of the first stator teeth 114 is 3.14×k1×d1÷Na, 0.1 < k1 < 0.8. Furthermore, the number, width of the first stator teeth 114 and the average diameter of the first air gap 160 in the first stator 110 satisfy certain parameters, and then the size of the notch of the first stator slot 116 can be defined, thereby adjusting the magnetic field distribution of the first stator yoke 112 and the first stator teeth 114, reducing the loss of the motor 100, improving the efficiency of the motor 100, and also adjusting the torque ripple and improving the efficiency of the motor 100.

[0145] The number of the second stator slots 146 is Na, and the average diameter of the second air gap 170 between the second stator 140 and the rotor 130 is d2. Thus, the width of the second stator teeth 144 is k2×d2÷Na, where 0.1 < k2 < 0.8. Furthermore, the number, width of the second stator teeth 144, and the average diameter of the second air gap 170 in the second stator 140 satisfy certain parameters, and then the size of the openings of the second stator slots 146 can be defined, thereby adjusting the magnetic field distribution of the second stator yoke 142 and the first stator teeth 114, reducing the losses of the motor 100, improving the efficiency of the motor 100, and also adjusting the torque ripple and improving the efficiency of the motor 100.

[0146] Embodiment 14:

[0147] As Figures 1 to 10 shown, on the basis of any one of Embodiments 1 to 13, further, the rotor 130 includes: the rotor 130 includes: a plurality of magnetic conductive members and a plurality of magnetic members 132, and the magnetic conductive members and the magnetic members 132 are alternately arranged to form an annular structure.

[0148] Among them, the value range of the ratio B of the total volume of the magnetic members 132 to the total volume of the magnetic conductive portions 134 is: greater than or equal to 0.6 and less than or equal to 6.

[0149] In this embodiment, the rotor 130 includes magnetic conductive members and magnetic members 132. The magnetic members 132 are arranged on the magnetic conductive portions 134. The ratio B of the total volume of the magnetic members 132 to the total volume of the magnetic conductive portions 134 is greater than or equal to 0.6 and less than or equal to 6, so as to ensure the overall volume of the magnetic members 132, thereby ensuring the magnetic field strength of the rotor 130, improving the torque of the motor 100, and improving the efficiency of the motor 100.

[0150] Specifically, the ratio of the total volume of the magnetic members 132 to the total volume of the magnetic conductive portions 134 is from 0.6 to 5.

[0151] Of course, in other embodiments of the present invention, the ratio of the total volume of the magnetic members 132 to the total volume of the magnetic conductive portions 134 can be 1.15.

[0152] Specifically, as shown in Table 5 below, which shows the output power of the motor provided by the present invention and the motors in the related art.

[0153] Table 5

[0154] B 0.3 1 7 <![CDATA[Volume (cm 3 )]]> 137 137 137 Input current (A) 0.2 0.2 0.2 Torque (Nm) 0.27 0.45 0.33 Speed (rpm) 1000 1000 1000 Output power (W) 28.3 47.1 34.5

[0155] Among them, except for B, other motor parameters are the same.

[0156] As shown in Table 5, the ratio B of the total volume of the magnetic member 132 to the total volume of the magnetic conductive portion 134 of the motor 100 provided by the present invention is equal to 1, and the effective volume of the motor 100 is 137 cm 3 , input current is 0.2A, torque is 0.45Nm, speed is 1000rpm, and output power is 47.1W.

[0157] In the motor of the related art, the ratio B of the total volume of the magnetic parts to the total volume of the magnetic conductive part is equal to 0.3, and the effective volume of the motor is 137cm 3 , input current is 0.2A, torque is 0.27Nm, speed is 1000rpm, and output power is 28.3W.

[0158] In the motor of the related art, the ratio B of the total volume of the magnetic parts to the total volume of the magnetic conductive part is equal to 7, and the effective volume of the motor is 137cm 3 , input current is 0.2A, torque is 0.33Nm, speed is 1000rpm, and output power is 34.5W.

[0159] In comparison, the torque and output power of the motor provided by the present invention are significantly higher than those of the motor in the related art.

[0160] Example 15:

[0161] like Figure 9 、 Figure 10 and Figure 11 As shown, based on any one of Examples 1 to 14, a first winding 118 is further wound around the first stator 110. Specifically, the first winding 118 is wound around the first stator yoke 112. Specifically, the first winding 118 is centrally wound, with a portion of the first winding 118 located within the first stator slot 116 and another portion located on the other side of the first stator yoke 112.

[0162] In this embodiment, the first winding 118 in the first stator 110 is wound on the first stator yoke 112 using a back-wound structure, and thus on the basis of the double stator, the end of the first winding 118 is shortened, thereby effectively balancing the contradiction between the excessive length of the end of the first winding 118 and the high winding factor of the motor 100. Moreover, compared with winding the first winding 118 on the first stator tooth 114, winding the first winding 118 on the first stator yoke 112 is obviously simpler, thereby reducing the production difficulty of the motor 100 and improving production efficiency.

[0163] In addition, the first winding 118 is distributed in such a manner that each first stator slot 116 corresponds to a first winding 118 , so that the span between adjacent first windings 118 is one pole pitch. Its structure is a centralized winding, which facilitates winding on the first stator yoke 112 and further improves the production efficiency of the motor 100 .

[0164] Example 16:

[0165] like Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 、 Figure 6 、 Figure 7 and Figure 8 As shown, based on any one of Embodiments 1 to 14, further, a first winding 118 is wound on the first stator 110. Specifically, the first winding 118 is wound on the first stator tooth 114. Specifically, the first winding 118 adopts centralized winding or distributed winding.

[0166] In this embodiment, when the first winding 118 is energized, a magnetic field is formed to drive the rotor 130 .

[0167] Example 17:

[0168] like Figure 2 As shown, based on any one of Examples 1 to 16, a second winding 148 is further wound on the second stator 140, and the second winding 148 is wound around the second stator yoke 142. Specifically, the second winding 148 is centrally wound, with a portion of the second winding 148 located within the second stator slot 146 and another portion located on the other side of the second stator yoke 142.

[0169] In this embodiment, the second winding 148 in the second stator 140 is wound on the second stator yoke 142 using a back-wound structure, and thus on the basis of the double stator, the end of the second winding 148 is shortened, thereby effectively balancing the contradiction between the excessive length of the end of the second winding 148 and the high winding factor of the motor 100. Moreover, compared with winding the second winding 148 on the second stator tooth 144, winding the second winding 148 on the second stator yoke 142 is obviously simpler, thereby reducing the production difficulty of the motor 100 and improving production efficiency.

[0170] In addition, the second winding 148 is distributed in such a manner that each second stator slot 146 corresponds to a second winding 148, so that the span between adjacent second windings 148 is one pole pitch. Its structure is a centralized winding, which facilitates winding on the second stator yoke 142 and further improves the production efficiency of the motor 100.

[0171] Example 18:

[0172] like Figure 2 、 Figure 5 、 Figure 6 and Figure 10 As shown, based on any one of Examples 1 to 16, further, a second winding 148 is wound on the second stator 140. Specifically, the second winding 148 is wound on the second stator teeth 144. Specifically, the second winding 148 adopts centralized winding or distributed winding.

[0173] In this embodiment, when the second winding 148 is energized, a magnetic field is formed to drive the rotor 130 .

[0174] Example 19:

[0175] On the basis of any one of Examples 1 to 18, further, the number of the magnetic conductive portions 134 is Zr, the number of the first stator slots 116 is Ns1, and the number of pole pairs of the first winding 118 is Pa1, Pa1=|Ns1±Zr÷2|.

[0176] In this embodiment, the number of magnetic conductive parts 134 is Zr, the number of stator slots of the first stator 110 is Ns1, and the number of pole pairs of a winding is Pa1, Pa1 = |Ns1±Zr÷2|. By adjusting the number of first stator teeth 114, the number of pole pairs of the first winding 118 and the number of magnetic conductive parts 134, the motor 100 is made more stable and the torque of the motor 100 is improved.

[0177] Example 20:

[0178] On the basis of any one of Examples 1 to 19, further, the number of the magnetic conductive portions 134 is Zr, the number of the second stator slots 146 is Ns2, and the number of pole pairs of the second winding 148 is Pa2, Pa2=|Ns2±Zr÷2|.

[0179] In this embodiment, the number of magnetic conductive parts 134 is Zr, the number of stator slots of the second stator 140 is Ns2, and the number of pole pairs of the second winding 148 is Pa2, Pa2 = |Ns2±Zr÷2|. By adjusting the number of second stator teeth 144, the number of pole pairs of the second winding 148 and the number of magnetic conductive parts 134, the motor 100 is made more stable and the torque of the motor 100 is improved.

[0180] Example 21:

[0181] On the basis of any one of Examples 15 to 20, further, the ratio of the axial length of the first stator 110 to the outer diameter of the first stator 110 is less than or equal to 1.6÷Pa1, where Pa1 is the number of pole pairs of the first winding 118 on the first stator 110.

[0182] In this embodiment, the ratio of the axial length to the outer diameter of the first stator 110 is reduced. Since the number of pole pairs of the first stator 110 is generally an integer greater than 1, the axial length of the first stator 110 is reduced, and the volume of the first stator 110 is reduced, making the motor 100 compact and facilitating a reduction in the volume of the motor 100. Specifically, the ratio of the axial length of the first stator 110 to the outer diameter of the first stator 110 is less than or equal to 3.

[0183] like Figure 14 As shown, the motor 100 provided by the present invention and the motor 100 in the related art using concentrated winding and tooth winding form, when the aspect ratio is not greater than 3, the motor 100 provided by the present invention has a higher torque density. The motor 100 provided by the present invention and the motor 100 in the related art using distributed winding and tooth winding form, the motor 100 provided by the present invention has a higher torque density.

[0184] Example 22:

[0185] On the basis of any one of Examples 17 to 21, further, the ratio of the axial length of the second stator 140 to the outer diameter of the second stator 140 is less than or equal to 12÷Pa2÷(K2+1), the pole pair number Pa2 of the second winding 148 on the second stator 140, and K2 is the number of second grooves 156 on a second stator tooth 144.

[0186] In this embodiment, the ratio of the axial length and the outer diameter of the second stator 140 structure is reduced, the pole pair number of the second stator 140 structure is generally an integer greater than 1, and the number of the second stator teeth 144 is generally an integer greater than 2, thereby reducing the axial length of the second stator 140 structure and reducing the volume of the second stator 140, making the motor 100 compact and facilitating reducing the volume of the motor 100.

[0187] Example 23:

[0188] Based on any one of Examples 1 to 22, further, a ratio of the number of pole pairs of the rotor 130 and the magnetic member 132 to the number of the first stator slots 116 is 0.5 to 2.5.

[0189] In this embodiment, the ratio of the number of pole pairs of the integral structure formed by the rotor 130 and the magnetic member 132 to the number of the first stator slots 116 is greater than or equal to 0.5 and less than or equal to 2.5, thereby improving the torque of the motor 100 .

[0190] For example, the rotor 130 and the magnetic member 132 form an integral structure with a pole pair number of 2, and the number of the first stator slots 116 is 20. The rotor 130 and the magnetic member 132 form an integral structure with a pole pair number of 4, and the number of the first stator slots 116 is 20.

[0191] Example 24:

[0192] Based on any one of Examples 1 to 23, further, the ratio of the total cross-sectional area of all first stator slots 116 to the total cross-sectional area of all second stator slots 146 is greater than or equal to 1 and less than or equal to 100.

[0193] In this embodiment, the ratio of the sum of the cross-sectional areas of all the first stator slots 116, that is, the total cross-sectional area of all the first stator slots 116, to the sum of the cross-sectional areas of all the second stator slots 146, that is, the total cross-sectional area of all the second stator slots 146, is greater than or equal to 1 and less than or equal to 100. By limiting the number of first windings 118 accommodated in the first stator slots 116 and the number of second windings 148 accommodated in the second stator slots 146, the entire magnetic field of the motor 100 is adjusted. Since the second stator 140 is located inside the rotor 130 and the overall volume of the second stator 140 is relatively small, reducing the cross-sectional area of the second stator slots 146 can reduce interference with the magnetic field generated by the second stator 140, so that the magnetic field generated by the second stator 140 can more smoothly cooperate with the magnetic field generated by the first stator 110, thereby improving the operating stability of the motor 100 and improving the efficiency of the motor 100.

[0194] Specifically, the ratio of the total cross-sectional area of all the first stator slots 116 to the total cross-sectional area of all the second stator slots 146 is greater than or equal to 20.

[0195] Example 25:

[0196] like Figure 7 As shown, on the basis of any one of Examples 1 to 24, further, the first stator 110 includes a first stator yoke 112, a first stator tooth 114 and a first salient pole 122, the first stator yoke 112 is an annular structure, the first stator tooth 114 is arranged on the inner ring of the first stator yoke 112, and the first salient pole 122 is arranged on the outer ring of the first stator yoke 112, wherein the first stator tooth 114 and the first salient pole 122 are arranged correspondingly.

[0197] Specifically, the inner ring of the first stator yoke 112 is provided with a plurality of first stator teeth 114, and the outer ring of the first stator yoke 112 is provided with a plurality of salient poles. First stator slots 116 are formed between adjacent first stator teeth 114, and first winding slots are formed between adjacent first salient poles 122. The first winding slots and the first stator slots 116 are arranged correspondingly. When the first winding 118 is back-wound, part of a first winding 118 is located in the first stator slot 116, and part of it is located in the first winding slot.

[0198] In this embodiment, the first stator 110 also includes a plurality of first salient poles 122, wherein the first stator yoke 112 is an annular structure, the first stator tooth 114 is arranged on the inner ring of the first stator yoke 112, and the first salient pole 122 is arranged on the outer ring of the first stator yoke 112, and one first salient pole 122 corresponds to one first stator tooth 114, and a first winding slot is formed between adjacent first salient poles 122, and the first winding slot corresponds to the first stator slot 116, that is, a first winding 118 is wound in a group of corresponding first stator slots 116 and the first winding slot, thereby adjusting the magnetic flux on the back of the first stator 110, thereby improving the torque of the motor 100 and improving the efficiency of the motor 100.

[0199] Example 26:

[0200] like Figure 8 As shown, on the basis of any one of Examples 1 to 25, further, the second stator 140 includes a second stator yoke 142, a second stator tooth 144 and a second salient pole 152, the second stator yoke 142 is an annular structure, the second stator tooth 144 is arranged on the outer ring of the second stator yoke 142, and the second salient pole 152 is arranged on the inner ring of the second stator yoke 142, wherein the second stator tooth 144 and the second salient pole 152 are arranged correspondingly.

[0201] Specifically, the inner ring of the second stator yoke 142 is provided with a plurality of second stator teeth 144, and the outer ring of the second stator yoke 142 is provided with a plurality of salient poles. Second stator slots 146 are formed between adjacent second stator teeth 144, and second winding slots are formed between adjacent second salient poles 152, wherein the second winding slots and the second stator slots 146 are arranged correspondingly, and thus part of a second winding 148 is located in the second stator slot 146, and another part is located in the second winding slot.

[0202] In this embodiment, the second stator 140 further includes a plurality of second salient poles 152. Among them, the second stator yoke 142 has an annular structure. The second stator teeth 144 are arranged on the inner ring of the second stator yoke 142, and the second salient poles 152 are arranged on the outer ring of the second stator yoke 142. Moreover, one second salient pole 152 corresponds to one second stator tooth 144. A second winding slot is formed between adjacent second salient poles 152. Furthermore, the second winding slot corresponds to the second stator slot 146, that is, one second winding 148 is wound in a group of corresponding second stator slots 146 and second winding slots, thereby regulating the magnetic flux on the back of the second stator 140, further enhancing the torque of the motor 100 and improving the efficiency of the motor 100.

[0203] Embodiment 27:

[0204] On the basis of any one of Embodiments 1 to 26, further, the average diameter of the first air gap 160 is d1, the minimum width of the tooth body of the first stator tooth 114 is A1×d1÷Ns1, and the maximum width of the tooth crown of the first stator tooth 114 is A1’×d1÷Ns1, where 0.1 < A1 < A1’ < 0.9, and Ns1 is the number of the first stator teeth 114.

[0205] In this embodiment, the minimum width of the tooth body of the first stator tooth 114 and the maximum width of the tooth crown of the first stator tooth 114 are defined to improve the ability of the first stator slot 116 to accommodate the first winding 118 and improve the efficiency of the motor 100.

[0206] Embodiment 28:

[0207] On the basis of any one of Embodiments 1 to 27, further, the number of the first grooves 126 of the first stator 110 is K×Ns1, where K is an integer representing the number of the first grooves 126 on each stator tooth. The value range of the ratio ks of the maximum width of the first grooves 126 in the first stator 110 to the maximum width of the tooth crown of the first stator tooth 114 is from 0.1 to 0.9.

[0208] In this embodiment, the width of the first grooves 126 and the maximum width of the tooth crown of the first stator tooth 114 are defined to improve the ability of the first grooves 126 to adjust the air gap, improve the efficiency of the motor 100, and improve the stability of the motor 100.

[0209] Embodiment 29:

[0210] As Figure 1 shown, the motor 100 provided by the present invention includes a first stator 110, a second stator 140 and a rotor 130. The outer diameters of the first stator 110 and the second stator 140 are different and they are concentrically arranged. Only the first winding 118 is arranged in the first stator 110.

[0211] The rotor 130 and the first stator 110 form a first air gap 160 , and the rotor 130 and the second stator 140 form a second air gap 170 .

[0212] The first stator 110 is provided with a first winding 118. The first stator 110 is provided with first stator slots 116 and first grooves 126. In the same cross-section, the ratio of the total area of the first stator slots 116 to the total area of the first grooves 126 is 17. First stator teeth 114 are formed between adjacent first stator slots 116, and first grooves 126 are further formed between adjacent first stator teeth 114.

[0213] The first stator 110 does not have the second winding 148 , but is provided with second stator slots 146 , with second stator teeth 144 formed between adjacent second stator slots 146 .

[0214] The first winding 118 uses concentrated winding and spans only one first stator tooth 114 .

[0215] The first winding 118 is placed only in the first stator slot 116 .

[0216] The ratio of the outer diameters of the second stator 140 to the first stator 110 is 0.4.

[0217] A ratio of the axial length to the outer diameter of the first stator 110 is less than 3.

[0218] The included angle between the center line of the first stator slot 116 and the center line of the salient pole of the second stator tooth 144 is no greater than 3.75°.

[0219] The axial length of the first stator 110 , the axial length of the second stator 140 , the axial length of the magnetic member 132 , and the axial length of the magnetic conductive portion 134 are all the same.

[0220] The magnetic conductive parts 134 are connected via magnetic conductive bridges.

[0221] The polarities of two adjacent permanent magnets are opposite, forming a magnetic concentration effect.

[0222] The plurality of magnetic members 132 are arranged in a spoke-type magnet arrangement.

[0223] The number of pole pairs Pa1 of the first winding 118 on the first stator 110 is 2, the number Zr of the magnetic conductive portions 134 is 20, and the total number Ns1 of slots in the first stator 110 is 12. The formula Pa1=|Ns1±Zr÷2| is satisfied.

[0224] The main parts of the first stator 110 , the second stator 140 and the magnetic conductive portion 134 are all constructed by laminating silicon steel sheets.

[0225] The first winding 118 is aluminum wire.

[0226] The magnetic component 132 is ferrite.

[0227] like Figure 14 As shown, the motor 100 provided by the present invention and the motor 100 in the related art using concentrated winding and tooth winding form, when the aspect ratio is not greater than 3, the motor 100 provided by the present invention has a higher torque density. The motor 100 provided by the present invention and the motor 100 in the related art using distributed winding and tooth winding form, the motor 100 provided by the present invention has a higher torque density.

[0228] Example 30:

[0229] like Figure 5 As shown, the motor 100 provided by the present invention includes a first stator 110, a second stator 140 and a rotor 130. The first stator 110 and the second stator 140 have different outer diameters and are arranged concentrically. The first winding 118 is only provided in the first stator 110.

[0230] The rotor 130 and the first stator 110 form a first air gap 160 , and the rotor 130 and the second stator 140 form a second air gap 170 .

[0231] The first stator 110 is provided with a first winding 118 , and the first stator 110 is provided with a first stator slot 116 and a first groove 126 .

[0232] The second stator 140 is provided with a second winding 148 . The second stator 140 is provided with second stator slots 146 . Second stator teeth 144 are formed between adjacent second stator slots 146 .

[0233] The first winding 118 uses concentrated winding and spans only one first stator tooth 114 .

[0234] The first winding 118 is placed only in the first stator slot 116 .

[0235] The first stator 110 has 6 first stator slots 116 and 6 first grooves 126 . The magnetic member 132 has 10 pole pairs, the magnetic conductive portions 134 have 20 pole pairs, and the first winding 118 on the first stator 110 has 2 pole pairs.

[0236] The ratio of the outer diameters of the second stator 140 to the first stator 110 is 0.32.

[0237] The ratio of the number of pole pairs of the rotor 130 to the number of first stator slots 116 of the first stator 110 is 1.67.

[0238] The ratio of the number of pole pairs of the rotor 130 to the number of pole pairs of the first winding 118 on the first stator 110 is 5.

[0239] In the same cross section, the ratio of the total area of the first stator slots 116 to the total area of the first grooves 126 is 17.

[0240] The ratio of the total volume of the magnetic member 132 to the total volume of the magnetic conductive portion 134 is 1.15.

[0241] The average diameter of the first air gap 160 is 52.9 mm, the average diameter of the second air gap 170 is 25.83 mm, the tooth body of the first stator tooth 114 is 5.7 mm, the width of the first auxiliary tooth 124 is 5.2 mm, the tooth width of the second stator tooth 144 is 2.17 mm, A1=0.21, k1=0.38, k2=0.32.

[0242] The thickness of the first air gap 160 and the second air gap 170 is 0.35 mm.

[0243] A ratio of the axial length to the outer diameter of the first stator 110 is less than 3.

[0244] The included angle between the center line of the first stator slot 116 and the center line of the salient pole of the second stator tooth 144 is no greater than 3.75°.

[0245] The axial length of the first stator 110 , the axial length of the second stator 140 , the axial length of the magnetic member 132 , and the axial length of the magnetic conductive portion 134 are all the same.

[0246] The magnetic conductive parts 134 are connected via magnetic conductive bridges.

[0247] The polarities of two adjacent permanent magnets are opposite, forming a magnetic concentration effect.

[0248] The plurality of magnetic members 132 are arranged in a spoke-type magnet arrangement.

[0249] The number of pole pairs Pa1 of the first winding 118 on the first stator 110 is 2, the number Zr of the magnetic conductive portions 134 is 20, and the total number Ns1 of slots in the first stator 110 is 12. The formula Pa1=|Ns1±Zr÷2| is satisfied.

[0250] The main parts of the first stator 110 , the second stator 140 and the magnetic conductive portion 134 are all constructed by laminating silicon steel sheets.

[0251] The first winding 118 is aluminum wire.

[0252] The magnetic component 132 is ferrite.

[0253] Example 31:

[0254] like Figure 4As shown, the motor 100 provided by the present invention includes a first stator 110, a second stator 140 and a rotor 130. The first stator 110 and the second stator 140 have different outer diameters and are arranged concentrically. The first winding 118 is only provided in the first stator 110.

[0255] The rotor 130 and the first stator 110 form a first air gap 160 , and the rotor 130 and the second stator 140 form a second air gap 170 .

[0256] The first stator 110 is provided with a first winding 118. The first stator 110 is provided with first stator slots 116 and first grooves 126. In the same cross-section, the ratio of the total area of the first stator slots 116 to the total area of the first grooves 126 is 17. First stator teeth 114 are formed between adjacent first stator slots 116, and first grooves 126 are further formed between adjacent first stator teeth 114.

[0257] The first winding 118 is a concentrated winding, and the first winding 118 only spans one first stator tooth 114 using concentrated winding.

[0258] The first stator 110 does not have the second winding 148 , but is provided with second stator slots 146 , with second stator teeth 144 formed between adjacent second stator slots 146 .

[0259] The ratio of the average diameter of the first air gaps 160 to the average diameter of the second air gaps 170 is 0.6.

[0260] The included angle between the center line of the first stator slot 116 and the center line of the salient pole of the second stator tooth 144 is no greater than 3.75°.

[0261] A ratio of the axial length to the outer diameter of the first stator 110 is less than 3.

[0262] The axial length of the first stator 110 , the axial length of the second stator 140 , the axial length of the magnetic member 132 , and the axial length of the magnetic conductive portion 134 are all the same.

[0263] The magnetic conductive parts 134 are connected via magnetic conductive bridges.

[0264] The polarities of two adjacent permanent magnets are opposite, forming a magnetic concentration effect.

[0265] The plurality of magnetic members 132 are arranged in a spoke-type magnet arrangement.

[0266] The number of pole pairs Pa1 of the first winding 118 on the first stator 110 is 2, the number Zr of the magnetic conductive portions 134 is 20, and the total number Ns1 of slots in the first stator 110 is 12. The formula Pa1=|Ns1±Zr÷2| is satisfied.

[0267] The main parts of the first stator 110 , the second stator 140 and the magnetic conductive portion 134 are all constructed by laminating silicon steel sheets.

[0268] The first winding 118 is copper wire.

[0269] The magnetic member 132 is made of neodymium iron boron.

[0270] The main parts of the first stator 110 , the second stator 140 and the magnetic conductive portion 134 are all constructed by laminating silicon steel sheets.

[0271] Example 32:

[0272] like Figure 2 As shown, the motor 100 provided by the present invention is applied to an air conditioner fan. It includes a first stator 110, a second stator 140, and a rotor 130. The first stator 110 and the second stator 140 have different outer diameters and are arranged concentrically. The first winding 118 is only provided in the first stator 110.

[0273] The first stator 110 has a first winding 118 , and the second stator 140 has a second winding 148 .

[0274] The rotor 130 and the first stator 110 form a first air gap 160 , and the rotor 130 and the second stator 140 form a second air gap 170 .

[0275] The number of the first stator slots 116 is 12, the number of the second stator slots 146 is 12, the number of pole pairs of the rotor 130 is 10, and the number of pole pairs of the first winding 118 on the first stator 110 is 2.

[0276] The rotor 130 includes a magnetic member 132 and a magnetic conductive portion 134 .

[0277] The ratio of the number of pole pairs of the rotor 130 to the number of first stator slots 116 of the first stator 110 is 0.83.

[0278] The ratio of the number of pole pairs of the rotor 130 to the number of pole pairs of the first winding 118 is 5.

[0279] In the same cross section, the ratio of the total area of the first stator slots 116 to the total area of the second stator slots 146 is 8.

[0280] The ratio of the total volume of the magnetic member 132 to the total volume of the magnetic conductive portion 134 is 1.

[0281] The average diameter of the first air gap 160 is 49.4 mm, the average diameter of the second air gap 170 is 28.3 mm, k1 is 0.31, k2 is 0.243, the tooth width of the first stator tooth 114 is 4 mm, and the tooth width of the second stator tooth 144 is 1.8 mm.

[0282] The thickness of the first air gap 160 and the second air gap 170 are both 0.35 mm.

[0283] The included angle between the center line of the first stator slot 116 and the center line of the salient pole of the second stator tooth 144 is 3°.

[0284] The axial length of the first stator 110 , the axial length of the second stator 140 , the axial length of the magnetic member 132 , and the axial length of the magnetic conductive portion 134 are all the same.

[0285] The magnetic conductive parts 134 are connected via magnetic conductive bridges.

[0286] The polarities of two adjacent permanent magnets are opposite, forming a magnetic concentration effect.

[0287] The plurality of magnetic members 132 are arranged in a spoke-type magnet arrangement.

[0288] The number of pole pairs Pa1 of the first winding 118 on the first stator 110 is 2, the number Zr of the magnetic conductive portions 134 is 20, and the total number Ns1 of slots in the first stator 110 is 12. The formula Pa1=|Ns1±Zr÷2| is satisfied.

[0289] The main parts of the first stator 110 , the second stator 140 and the magnetic conductive portion 134 are all constructed by laminating silicon steel sheets.

[0290] The first winding 118 is aluminum wire.

[0291] The magnetic component 132 is ferrite.

[0292] Example 33:

[0293] like Figure 2 As shown, the motor 100 provided by the present invention includes a first stator 110, a second stator 140, and a rotor 130. The first stator 110 and the second stator 140 have different outer diameters and are arranged concentrically. The first winding 118 is only provided in the first stator 110. The rotor 130 includes a magnetic member 132 and a magnetic conductive portion 134.

[0294] The first stator 110 is provided with a first winding 118. The first stator 110 is provided with first stator slots 116 and first grooves 126. In the same cross-section, the ratio of the total area of the first stator slots 116 to the total area of the first grooves 126 is 17. First stator teeth 114 are formed between adjacent first stator slots 116, and first grooves 126 are further formed between adjacent first stator teeth 114.

[0295] The first winding 118 is a concentrated winding, and the first winding 118 only spans one first stator tooth 114 using concentrated winding.

[0296] The second stator 140 is provided with second stator slots 146 facing the rotor 130 . A second winding 148 is provided on the second stator yoke 142 . One side of the second winding 148 is placed in the second stator slots 146 , and the other side is placed on the back side of the second stator yoke 142 .

[0297] Twelve second stator slots 146 are defined in the second stator 140, and second windings 148 are wound around the second stator yoke 142 of the second stator 140. Only one side of each second winding 148 is placed in a second stator slot 146 on the side of the second stator 140 facing the rotor 130. To minimize the span of the second winding 148 across the second stator yoke 142 of the second stator 140, the other side is placed in the second winding slot closest to the second stator slot 146 on the side facing away from the rotor 130, or on the back side of the second stator yoke 142.

[0298] The number of pole pairs of the rotor 130 is 10, the number of second stator slots 146 is 12, and the ratio of the number of pole pairs of the rotor 130 to the number of second stator slots 146 is 0.833. The number of pole pairs of the rotor 130 is 10, the total number of first stator slots 116 and first grooves 126 is 12, and the ratio of the number of pole pairs of the rotor 130 to the total number of first stator slots 116 and first grooves 126 is 0.833. The number of pole pairs of the second winding 148 is 2, and the ratio of the pole pair number Pr of the rotor 130 to the pole pair number of the second winding 148 is 5. The ratio of the total volume of the magnetic member 132 to the total volume of the magnetic conductive portion 134 is 0.55. The thickness of the first air gap 160 and the second air gap 170 are both 0.4 mm.

[0299] The average diameter of the second air gap 170 formed by the second stator 140 and the rotor 130 is d2, and the width of the second stator teeth 144 is k2×d2÷Na, where k2=0.3.

[0300] The average diameter of the first air gap 160 formed by the first stator 110 and the rotor 130 is d1, the minimum width of the tooth body of the first stator tooth 114 of the first stator 110 is k1×d1÷Na, and the maximum width of the tooth crown of the first stator tooth 114 is k1′×d1÷Na, where k1=0.2 and k1′=0.8.

[0301] The rotor 130 is located between the second stator 140 and the first stator 110 , and is composed of a magnetic member 132 and a magnetic conductive portion 134 .

[0302] The rotor 130, the first stator 110, and the second stator 140 form two air gaps of different diameters, namely, a first air gap 160 formed by the rotor 130 and the first stator 110, and a second air gap 170 formed by the rotor 130 and the second stator 140. The ratio of the average diameter of the second air gap 170 to the average diameter of the first air gap 160 is 0.6.

[0303] An included angle between a center line of the first stator slot 116 and a center line of the second stator tooth 144 is no greater than 3.75°.

[0304] A ratio of the axial length to the outer diameter of the first stator 110 is less than 3.

[0305] The axial length of the first stator 110 , the axial length of the second stator 140 , the axial length of the magnetic member 132 , and the axial length of the magnetic conductive portion 134 are all the same.

[0306] The magnetic conductive parts 134 are connected via magnetic conductive bridges.

[0307] The polarities of two adjacent permanent magnets are opposite, forming a magnetic concentration effect.

[0308] The plurality of magnetic members 132 are arranged in a spoke-type magnet arrangement.

[0309] The pole pair number Pa1 of the first winding 118 on the first stator 110 is 2, the number Zr of the magnetic conductive portions 134 is 20, and the total number Ns1 of the first stator slots 116 is 12. The formula Pa1=|Ns1±Zr÷2| is satisfied.

[0310] The main parts of the first stator 110 , the second stator 140 and the magnetic conductive portion 134 are all constructed by laminating silicon steel sheets.

[0311] The first winding 118 and the second winding 148 are copper wires.

[0312] The magnetic member 132 is made of neodymium iron boron.

[0313] Example 34:

[0314] The present invention provides an electrical device, including: a motor 100 provided in any of the above embodiments.

[0315] The electrical device provided by the present invention includes the motor 100 provided in any of the above embodiments, and therefore has all the beneficial effects of the motor 100 provided in any of the above embodiments, which will not be described one by one here.

[0316] Specifically, electrical appliances include washing machines, blenders or compressors, etc.

[0317] In the present invention, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The term "plurality" refers to two or more, unless expressly limited otherwise. Terms such as "installed," "connected," "connected," and "fixed" should be interpreted broadly. For example, "connected" can mean a fixed connection, a detachable connection, or an integral connection; "connected" can mean a direct connection or an indirect connection through an intermediary. Those skilled in the art will understand the specific meanings of these terms in the present invention based on specific circumstances.

[0318] In the description of the present invention, it should be understood that the directions or positional relationships indicated by terms such as "up", "down", "left", "right", "front" and "back" are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or unit referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they should not be understood as limiting the present invention.

[0319] Throughout this specification, terms such as "one embodiment," "some embodiments," and "specific embodiments" mean that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, schematic representations of these 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 any one or more embodiments or examples.

[0320] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A motor, characterized in that: include: a first stator, the first stator comprising a first stator yoke and first stator teeth, the first stator teeth being arranged on the first stator yoke, a plurality of first stator teeth being provided, and first stator slots being formed between adjacent first stator teeth; a rotor, disposed inside the first stator; The second stator is arranged on the inner side of the rotor, Wherein, a first groove is provided on a side of the first stator tooth facing the rotor; The second stator comprises: a second stator yoke; a second stator tooth disposed on a second stator yoke, wherein the number of the second stator teeth is plural, second stator slots are formed between adjacent second stator teeth, and a second groove is provided on a side of the second stator tooth facing the rotor; 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; The ratio of the average diameter of the second air gap to the average diameter of the first air gap ranges from 0.3 to 0.95; The number of the first stator slots and the number of the second stator slots are equal, both are Na, the average diameter of the first air gap is d1, the average diameter of the second air gap is d2, the width of the first stator tooth is 3.14×k1×d1÷Na, and the width of the second stator tooth is k2×d2÷Na, where k1 represents the proportion of all the first stator teeth on the circumference, k2 represents the proportion of all the second stator teeth on the circumference, and 0.1 <k1<0.8,0.1<k2<0.8。 2. The motor according to claim 1, characterized in that The ratio of the total cross-sectional area of all the first stator slots to the total cross-sectional area of all the first grooves ranges from 1 to 80.

3. The motor according to claim 1, characterized in that A slot opening of the first stator slot faces the rotor, and a slot opening of the second stator slot faces the rotor.

4. The motor according to claim 1, characterized in that The thickness of the first air gap and the thickness of the second air gap range from 0.05 mm to 3 mm.

5. The motor according to claim 1, characterized in that An angle between a center line of adjacent first stator slots and a center line of adjacent second stator teeth is less than or equal to 45°÷Ns2, where Ns2 represents the number of the second stator slots.

6. The motor according to claim 1, characterized in that The rotor comprises: multiple magnetic conductive parts; Multiple magnetic parts, the magnetic conductive parts and the magnetic parts are spliced into a ring structure along a ring shape, the magnetic parts are arranged between adjacent magnetic conductive parts, and the ratio of the total volume of the magnetic parts to the total volume of the magnetic conductive parts ranges from 0.6 to 6.

7. The motor according to claim 6, wherein A first winding is provided on the first stator; and / or The second stator is provided with a second winding.

8. The motor according to claim 7, wherein The number of the magnetic conductive parts is Zr, the number of the first stator slots is Ns1, the number of pole pairs of the first winding on the first stator is Pa1, Pa1=|Ns1±Zr÷2|; and / or The number of the magnetic conductive parts is Zr, the number of the second stator slots is Ns2, and the number of pole pairs of the second winding on the second stator is Pa2, Pa2=|Ns2±Zr÷2|.

9. The motor according to claim 7, characterized in that A ratio of the axial length of the first stator to the outer diameter of the first stator is less than or equal to 1.6÷Pa1, where Pa1 is the number of pole pairs of the first winding on the first stator.

10. The motor according to claim 7, characterized in that A ratio of the axial length of the second stator to the outer diameter of the second stator is less than or equal to 12÷Pa2÷(K2+1), the number of pole pairs of the second winding on the second stator is Pa2, and K2 is the number of the second grooves on one second stator tooth.

11. An electrical device, characterized in that: include: A motor as claimed in any one of claims 1 to 10.

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