Electric machines and electric appliances

Abstract

The application provides a motor and an electrical device, wherein the motor comprises a first stator, a first stator yoke and a first stator tooth, the first stator tooth is arranged on the first stator yoke; a rotor, which is sleeved outside the first stator; a second stator, which is sleeved outside the rotor, the second stator comprises a second stator yoke and a second stator tooth, the second stator tooth is arranged on the second stator yoke; and a winding, which is arranged on the first stator yoke and / or the second stator yoke. The winding is arranged on the first stator yoke or the second stator yoke in the form of yoke winding, or the winding is arranged on both the first stator yoke and the second stator yoke, so that the end part of the winding is shortened, the contradiction between the too long end part of the winding and the high winding factor of the motor is effectively balanced, the winding is arranged on the first stator yoke and / or the second stator yoke, which is obviously simpler, so that the production difficulty of the motor is reduced and the production efficiency is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electric machines, in particular to an electric machine and an electric appliance. BACKGROUND

[0002] In the related art, a double air gap permanent magnet electric machine has the advantages of simple rotor, large torque and high efficiency. However, the existing double stator vernier permanent magnet electric machine cannot balance the contradiction between high winding factor and long end winding. At the same time, the existing double stator permanent magnet electric machine with distributed winding has winding difficulty. SUMMARY

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

[0004] To this end, the first aspect of the present application provides an electric machine.

[0005] The second aspect of the present application provides an electric appliance.

[0006] Therefore, according to the first aspect of the present application, the present application provides an electric machine, comprising: a first stator, the first stator comprising a first stator yoke and a first stator tooth, the first stator tooth being arranged on the first stator yoke; a rotor, the rotor being arranged outside the first stator; a second stator, the second stator being arranged outside the rotor, the second stator comprising a second stator yoke and a second stator tooth, the second stator tooth being arranged on the second stator yoke; and a winding, the winding being arranged on the first stator yoke and / or the second stator yoke.

[0007] The electric machine provided by the present application comprises a first stator, a rotor, a second stator and a winding. Along the axial direction of the first stator, the rotor is arranged outside the first stator. Along the axial direction of the rotor, the second stator is arranged outside the rotor. The rotor is located between the first stator and the second stator. Thus, the first stator and the rotor can be regarded as a set of electric machine systems, and the second stator and the rotor can be regarded as a set of electric machine systems. Therefore, the torque density of the entire electric machine is improved, and the efficiency of the electric machine is improved.

[0008] Furthermore, the first stator comprises a first stator yoke and a first stator tooth, the first stator tooth being arranged on the inner side or the outer side of the first stator yoke. The second stator comprises a second stator yoke and a second stator tooth, the second stator tooth being arranged on the inner side or the outer side of the second stator yoke. Thus, the winding is arranged on the first stator yoke or the second stator yoke in the form of yoke winding, or the winding is arranged on both the first stator yoke and the second stator yoke. Thus, on the basis of the double stator, the end of the winding is shortened. Therefore, the contradiction between the long end of the winding and the high winding factor of the electric machine is effectively balanced. Furthermore, compared with arranging the winding on the first stator tooth and / or the second stator tooth, arranging the winding on the first stator yoke and / or the second stator yoke is obviously simpler. Thus, the production difficulty of the electric machine is reduced, and the production efficiency is improved.

[0009] In addition, the motor provided by the technical scheme has the following additional technical features.

[0010] On the basis of the above technical scheme, further, the winding is a concentrated winding.

[0011] In the technical scheme, the winding is a concentrated winding, that is, only one coil is wound between adjacent first stator teeth and / or second stator teeth, thereby facilitating winding on the first stator yoke and / or the second stator yoke, and further improving the production efficiency of the motor.

[0012] On the basis of any of the above technical schemes, further, the first stator teeth extend from the first stator yoke toward the rotor direction; and / or the second stator teeth extend from the second stator yoke toward the rotor direction.

[0013] In the technical scheme, the first stator teeth face the rotor, and the air gap can be improved by using the first stator teeth, thereby improving the torque received by the rotor.

[0014] The second stator teeth face the rotor, and the air gap can be improved by using the second stator teeth, thereby improving the torque received by the rotor.

[0015] On the basis of any of the above technical schemes, further, the first stator further comprises: a first protruding portion extending from the first stator yoke away from the rotor direction, the first protruding portion corresponding to the first stator teeth; and / or the second stator further comprises: a second protruding portion extending from the second stator yoke away from the rotor direction, the second protruding portion corresponding to the second stator teeth.

[0016] In the technical scheme, the first stator further comprises a first protruding portion, wherein the first stator yoke has a ring structure, the first stator teeth are arranged on the outer ring of the first stator yoke, the first protruding portion is arranged on the inner ring of the first stator yoke, one first protruding portion corresponds to one first stator tooth, one side of the winding can be arranged between adjacent first stator teeth, and another side of the winding can be arranged between adjacent first protruding portions, thereby adjusting the magnetic flux of the back of the first stator yoke by using the first protruding portion, thereby improving the torque of the motor and improving the efficiency of the motor.

[0017] The second stator further comprises a second protruding portion, wherein the second stator yoke has a ring structure, the second stator teeth are arranged on the outer ring of the second stator yoke, the second protruding portion is arranged on the inner ring of the second stator yoke, one second protruding portion corresponds to one second stator tooth, one side of the winding can be arranged between adjacent second stator teeth, and another side of the winding can be arranged between adjacent second protruding portions, thereby adjusting the magnetic flux of the back of the second stator yoke by using the second protruding portion, thereby improving the torque of the motor and improving the efficiency of the motor.

[0018] On the basis of any of the preceding technical solutions, further, the first stator and the rotor form a first air gap, and the second stator and the rotor form a second air gap.

[0019] 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, so that the torque of the motor can be improved.

[0020] On the basis of any of the preceding technical solutions, further, the thickness of the first air gap and the thickness of the second air gap are in the range of 0.05mm to 3mm; and / or the ratio of the average diameter of the first air gap to the average diameter of the second air gap is in the range of 0.1 to 0.95.

[0021] In this technical solution, the thickness of the first air gap and the thickness of the second air gap are in the range of 0.05mm to 3mm, and the thickness of the first air gap and the thickness of the second air gap can be the same or different. By adjusting the overall air gap magnetic flux through the air gap with the above thickness, the magnetic resistance and the harmonic magnetic field are balanced, and the magnetic resistance and the harmonic magnetic field of the entire motor are balanced.

[0022] The ratio of the average diameter of the first air gap to the average diameter of the second air gap indirectly limits the outer diameter and the inner diameter of the rotor, thereby adjusting the structure of the entire motor, adjusting the distance between the first air gap and the second air gap, and adjusting the magnetic field to improve the torque per unit volume. When the ratio of the average diameter of the first air gap to the average diameter of the second air gap is greater than or equal to 0.1 and less than or equal to 0.95, the above effect is optimal.

[0023] On the basis of any of the preceding technical solutions, further, the number of the first stator teeth is a plurality, the first stator slots are formed between adjacent first stator teeth, the number of the second stator teeth is a plurality, the second stator slots are formed between adjacent second stator teeth, and the ratio of the total area of the second stator slots to the total area of the first stator slots in a cross section perpendicular to the first stator axis is in the range of 1 to 100.

[0024] In this technical solution, a plurality of first stator teeth are arranged on the first stator yoke, the first stator slots are formed between adjacent first stator teeth, a plurality of second stator teeth are arranged on the second stator yoke, and the second stator slots are formed between adjacent second stator teeth.

[0025] The ratio of the total cross-sectional area of all the second stator slots to the total cross-sectional area of all the first stator slots is greater than or equal to 1 and less than or equal to 100, thereby adjusting the overall magnetic field of the motor by limiting the number of windings accommodated by the first stator slots and the number of windings accommodated by the second stator slots, and the overall volume of the first stator is small because the first stator is located inside the rotor, so limiting the cross-sectional area of the first stator slots to be no greater than the cross-sectional area of the second stator slots can reduce the magnetic field generated by the first stator from interfering with the magnetic field generated by the second stator, allowing the magnetic field generated by the first stator to more smoothly cooperate with the magnetic field generated by the second stator, thereby improving the stability of the motor operation and improving the efficiency of the motor.

[0026] On the basis of any of the above technical solutions, further, the number of first stator slots is Ns1, and the included angle between the center line of adjacent second stator slots and the center line of the first stator teeth is less than or equal to 45°÷Ns1, and Ns1 represents the number of first stator slots.

[0027] In this technical solution, the number of first stator slots is Ns1, and the included angle between the center line of adjacent second stator slots and the center line of the first stator teeth is less than or equal to 45°÷Ns1, thereby forming a form in which the first stator teeth correspond to the second stator slots and the second stator teeth correspond to the first stator slots, thereby adjusting the magnetic field formed by the first stator and the second stator, reducing the harmonic magnetic field, reducing the pulsation, and reducing the vibration of the rotor.

[0028] On the basis of any of the above technical solutions, further, the number of first stator slots and the number of second stator slots are equal, both being 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 teeth is k1×d1÷Na, and the width of the second stator teeth is 3.14×k2×d2÷Na, where k1 represents the proportion of all first stator teeth in the circumference, k2 represents the proportion of all second stator teeth in the circumference, 0.1

[0029] In this technical solution, the number of first stator slots and the number of second stator slots are equal, both being Na, thereby making the overall magnetic field of the motor more regular, thereby improving the torque of the motor.

[0030] And, the average diameter of the first air gap between the first stator and the rotor is d1, so that the width of the first stator tooth is k1 x d1 ÷ Na, 0.1 < k1 < 0.8, and then the number of the first stator tooth, the width of the first stator tooth and the average diameter of the first air gap in the first stator meet certain parameters, so that the size of the first stator slot opening can be limited, the magnetic field distribution of the first stator yoke and the first stator tooth is adjusted, the loss of the motor is reduced, the efficiency of the motor is improved, and the torque ripple is also adjusted to improve the efficiency of the motor.

[0031] The average diameter of the second air gap between the second stator and the rotor is d2, so that the width of the second stator tooth is 3.14 x k2 x d2 ÷ Na, 0.1 < k2 < 0.8, and then the number of the second stator tooth, the width of the second stator tooth and the average diameter of the second air gap in the second stator meet certain parameters, so that the size of the second stator slot opening can be limited, the magnetic field distribution of the second stator yoke and the second stator tooth is adjusted, the loss of the motor is reduced, the efficiency of the motor is improved, and the torque ripple is also adjusted to improve the efficiency of the motor.

[0032] On the basis of any of the above technical solutions, further, the rotor comprises: a plurality of magnetic conductive parts; a plurality of magnetic parts, the magnetic conductive parts and the magnetic parts are spliced into a ring structure in 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 is in the range of 0.6 to 6.

[0033] In this technical solution, the rotor comprises magnetic conductive parts and magnetic parts, the magnetic parts are arranged in the magnetic conductive parts, the ratio of the total volume of the magnetic parts to the total volume of the magnetic conductive parts is greater than or equal to 0.6 and less than or equal to 6, so that the magnetic parts are guaranteed to be integral, and the magnetic field strength of the rotor is ensured, the torque of the motor is improved, and the efficiency of the motor is improved.

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

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

[0036] The number of the magnetic conductive part is Zr, the number of the stator slot of the second stator is Ns2, and the pole pair number of the second winding is Pa2, Pa2=|Ns2±Zr÷2|, by adjusting the number of the second stator tooth, the pole pair number of the second winding and the number of the magnetic conductive part, the motor is 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 12÷Pa1÷(K1+1), K1 is the number of the first recess on a first stator tooth.

[0038] In the technical solution, the ratio of the axial length to the outer diameter of the first stator structure is reduced, the pole pair number of the first stator structure is usually an integer greater than 1, and the number of the first stator tooth is usually an integer greater than 2, thereby reducing the axial length of the first stator structure, reducing the volume of the first stator, making the motor compact, and facilitating the reduction of 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 1.6÷Pa2, Pa2 is the pole pair number of the winding on the second stator.

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

[0041] According to the second aspect of the present application, the present application provides an electrical appliance comprising the motor provided in any of the above technical solutions.

[0042] The motor provided by the present application has all the beneficial effects of the motor provided in any of the above technical solutions, and will not be described one by one.

[0043] Additional aspects and advantages of the present application will become apparent from the following description part, or be understood by the practice of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0044] The above and / or additional aspects and advantages of the present application will become apparent and more readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings, in which:

[0045] Fig. 1 Part of the structure schematic diagram of the motor provided by one embodiment of the present application is shown;

[0046] Fig. 2 Part of the structure schematic diagram of the motor provided by one embodiment of the present application is shown;

[0047] Fig. 3 Fig. 1 shows a partial structural schematic diagram of a motor provided by an embodiment of the present application;

[0048] Fig. 4 Fig. 1 shows a partial structural schematic diagram of a motor provided by an embodiment of the present application;

[0049] Fig. 5 Fig. 1 shows a partial structural schematic diagram of a motor provided by an embodiment of the present application;

[0050] Fig. 6 Fig. 1 shows a partial structural schematic diagram of a motor provided by an embodiment of the present application;

[0051] Fig. 7 Fig. 1 shows a partial structural schematic diagram of a motor provided by an embodiment of the present application;

[0052] Fig. 8 Fig. 1 shows a partial structural schematic diagram of a motor provided by an embodiment of the present application;

[0053] Fig. 9 Fig. 1 shows a partial structural schematic diagram of a motor provided by an embodiment of the present application;

[0054] Fig. 10 Fig. 1 shows a partial structural schematic diagram of a motor provided by an embodiment of the present application;

[0055] Fig. 11 Fig. 1 shows a partial structural schematic diagram of a motor provided by an embodiment of the present application;

[0056] Fig. 12 Fig. 1 shows a partial structural schematic diagram of a motor provided by an embodiment of the present application;

[0057] Fig. 13 Fig. 1 shows a partial structural schematic diagram of a motor provided by an embodiment of the present application;

[0058] Fig. 14 Fig. 1 shows a partial structural schematic diagram of a motor provided by an embodiment of the present application;

[0059] Fig. 15 Fig. 1 shows a partial structural schematic diagram of a motor provided by an embodiment of the present application;

[0060] Fig. 16 Fig. 1 shows a partial structural schematic diagram of a motor provided by an embodiment of the present application;

[0061] Fig. 17 Fig. 1 shows a partial structural schematic diagram of a motor provided by an embodiment of the present application;

[0062] Fig. 18A comparison chart of torque density in the motor provided by one embodiment of the present application and a motor in related art is shown in the case where the ratio of the axial length to the diameter of the first stator is different.

[0063] wherein, Figs. 1 to 17 The correspondence between the reference signs and the component names in the drawings is as follows:

[0064] 100 motor, 110 first stator, 112 first stator yoke, 114 first stator tooth, 116 first stator slot, 118 first winding, 122 first protrusion, 124 first stator protruding tooth, 126 first recess, 130 rotor, 132 magnetic member, 134 magnetic conducting portion, 140 second stator, 142 second stator yoke, 144 second stator tooth, 146 second stator slot, 148 second winding, 152 second protrusion, 154 second stator protruding tooth, 156 second recess, 160 first air gap, 170 second air gap. DETAILED DESCRIPTION

[0065] In order to more clearly understand the above objectives, features and advantages of the present application, the following further specifically describes the present application with reference to the accompanying drawings and specific embodiments. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0066] In the following description, a large number of specific details are set forth in order to facilitate a thorough understanding of the present application, however, the present application can also be implemented in other manners different from those described herein, and therefore, the protective scope of the present application is not limited by the specific embodiments disclosed below.

[0067] The motor 100 and the electrical appliance according to some embodiments of the present application are described below with reference to Figs. 1 to 18 .

[0068] As shown in Figs. 1 to 17 , the motor 100 provided by the present application includes a first stator 110, a rotor 130, a second stator 140 and a winding, the winding is arranged on the first stator 110 and / or the second stator 140, specifically, the winding includes a first winding 118 and a second winding 148, the first winding 118 is arranged on the first stator 110, and the second winding 148 is arranged on the second stator 140.

[0069] Embodiment 1:

[0070] As shown in Fig. 10 , Fig. 11 , Fig. 12 , Fig. 13 , Fig. 14 and Fig. 15As shown, the motor 100 includes a first stator 110, a rotor 130, a second stator 140, and a first winding 118. The first stator 110 is located inside the rotor 130, and the second stator 140 is located outside the rotor 130. The first stator 110 includes a first stator yoke 112 and a first stator tooth 114 arranged on the first stator yoke 112. The first winding 118 is arranged on the first stator yoke 112.

[0071] The motor 100 includes the first stator 110, the rotor 130, the second stator 140, and the first winding 118. Along the axial direction of the first stator 110, the rotor 130 is arranged outside the first stator 110. Along the axial direction of the rotor 130, the second stator 140 is arranged outside the rotor 130. The rotor 130 is located between the first stator 110 and the second stator 140. Thus, the first stator 110 and the rotor 130 can be regarded as a motor 100 system, and the second stator 140 and the rotor 130 can be regarded as a motor 100 system. Therefore, the torque density of the entire motor 100 is improved, and the efficiency of the motor 100 is improved.

[0072] In addition, the first stator 110 includes the first stator yoke 112 and the first stator tooth 114. The first stator tooth 114 is arranged on the inner side or the outer side of the first stator yoke 112. Thus, on the basis of the double stator, the end portion of the first winding 118 is shortened. Therefore, the contradiction between the excessively long end portion of the first winding 118 and the high winding factor of the motor 100 is effectively balanced. In addition, compared with winding the winding on the first stator tooth 114, winding the first winding 118 on the first stator yoke 112 is obviously simpler. Therefore, the production difficulty of the motor 100 is reduced, and the production efficiency is improved.

[0073] Further, the first winding 118 is a concentrated winding.

[0074] In this embodiment, the first winding 118 is a concentrated winding. That is, only one coil is arranged between adjacent first stator teeth 114. Thus, the winding on the first stator yoke 112 is facilitated, and the production efficiency of the motor 100 is further improved.

[0075] Embodiment 2:

[0076] As Fig. 1 , Fig. 2 , Fig. 3 , Fig. 4 , Fig. 5 , Fig. 6 , Fig. 7 , Fig. 8 and Fig. 9As shown, the motor 100 comprises a first stator 110, a rotor 130, a second stator 140 and a second winding 148, the first stator 110 is located inside the rotor 130, the second stator 140 is located outside the rotor 130, the second stator 140 comprises a second stator yoke 142 and a second stator tooth 144 arranged on the second stator yoke 142, and the second winding 148 is arranged on the second stator yoke 142.

[0077] The motor 100 comprises the first stator 110, the rotor 130, the second stator 140 and the second winding 148, along the axial direction of the first stator 110, the rotor 130 is sleeved outside the first stator 110, along the axial direction of the rotor 130, the second stator 140 is sleeved outside the rotor 130, and the rotor 130 is located between the first stator 110 and the second stator 140, so that 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, so as to improve the torque density of the entire motor 100 and improve the efficiency of the motor 100.

[0078] In addition, the second stator 140 comprises a second stator yoke 142 and a second stator tooth 144, and the second stator tooth 144 is arranged inside or outside the second stator yoke 142, so that the end of the second winding 148 is shortened on the basis of the double stator, thereby effectively balancing the contradiction between the too long end of the second winding 148 and the high winding factor of the motor 100, and compared with winding the winding 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 the production efficiency. Further, the second winding 148 is a concentrated winding.

[0079] In this embodiment, the second winding 148 adopts a concentrated winding, that is, only one coil is wound between adjacent second stator teeth 144, thereby facilitating winding on the second stator yoke 142 and further improving the production efficiency of the motor 100.

[0080] Embodiment 3:

[0081] As Fig. 13 , Fig. 14 and Fig. 15As shown, the motor 100 includes a first stator 110, a rotor 130, a second stator 140, a first winding 118 and a second winding 148, the first stator 110 is located inside the rotor 130, the second stator 140 is located outside the rotor 130, the first stator 110 includes a first stator yoke 112 and a first stator tooth 114 arranged on the first stator yoke 112, the first winding 118 is arranged on the first stator yoke 112, the second stator 140 includes a second stator yoke 142 and a second stator tooth 144 arranged on the second stator yoke 142, and the second winding 148 is arranged on the second stator yoke 142.

[0082] The motor 100 includes a first stator 110, a rotor 130, a second stator 140 and a second winding 148, along the axial direction of the first stator 110, the rotor 130 is sleeved outside the first stator 110, along the axial direction of the rotor 130, the second stator 140 is sleeved outside the rotor 130, and the rotor 130 is located between the first stator 110 and the second stator 140. Then 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, so as to improve the torque density of the whole motor 100 and improve the efficiency of the motor 100.

[0083] In addition, the first stator 110 includes a first stator yoke 112 and a first stator tooth 114, the first stator tooth 114 is arranged inside or outside the first stator yoke 112, the second stator 140 includes a second stator yoke 142 and a second stator tooth 144, the second stator tooth 144 is arranged inside or outside the second stator yoke 142. Then on the basis of the double stator, the end part of the first winding 118 and the second winding 148 is shortened, so as to effectively balance the contradiction between the too long end part of the first winding 118 and the second winding 148 and the high winding factor of the motor 100. Moreover, compared with winding the winding on the first stator tooth 114 and the second stator tooth 144, winding the first winding 118 on the first stator yoke 112 and winding the second winding 148 on the second stator yoke 142 is obviously simpler, so as to reduce the production difficulty of the motor 100 and improve the production efficiency.

[0084] Further, the first winding 118 and the second winding 148 are both concentrated winding.

[0085] In this embodiment, the first winding 118 adopts concentrated winding, that is, only one coil is wound between adjacent first stator teeth 114, so as to facilitate winding on the first stator yoke 112 and further improve the production efficiency of the motor 100.

[0086] The second winding 148 adopts a concentrated winding, that is, only one coil is wound between adjacent second stator teeth 144, which facilitates the winding of the second stator yoke 142 and further improves the production efficiency of the motor 100.

[0087] Example 4:

[0088] like Figs. 1 to 17 As shown, based on any of Embodiments 1 to 3, the first stator tooth 114 is further provided to extend from the first stator yoke 112 toward the rotor 130. The first stator yoke 112 has an annular structure, and the first stator tooth 114 is located on the outer ring of the first stator yoke 112.

[0089] In this embodiment, the first stator tooth 114 faces the rotor 130, thereby improving the air gap and increasing the torque received by the rotor 130.

[0090] Example 5:

[0091] like Figs. 1 to 17 As shown, based on any of Embodiments 1 to 3, the second stator tooth 144 is further provided by extending from the second stator yoke 142 toward the rotor 130. The second stator yoke 142 has an annular structure, and the second stator tooth 144 is located in the inner ring of the second stator yoke 142.

[0092] In this embodiment, the second stator tooth 144 faces the rotor 130, thereby improving the air gap and increasing the torque received by the rotor 130.

[0093] Example 6:

[0094] like Figs. 1 to 17 As shown, based on any of Embodiments 1 to 3, the first stator tooth 114 extends from the first stator yoke 112 toward the rotor 130, and the second stator tooth 144 extends from the second stator yoke 142 toward the rotor 130. The first stator yoke 112 has an annular structure, and the first stator tooth 114 is located on the outer ring of the first stator yoke 112. The second stator yoke 142 has an annular structure, and the second stator tooth 144 is located on the inner ring of the second stator yoke 142.

[0095] In this embodiment, the first stator tooth 114 faces the rotor 130, thereby improving the air gap and increasing the torque received by the rotor 130. The second stator tooth 144 faces the rotor 130, thereby improving the air gap and increasing the torque received by the rotor 130.

[0096] Example 7:

[0097] like Fig. 2As shown, based on any of Embodiments 1 to 6, the first stator 110 further includes a first stator yoke 112, a first stator tooth 114, and a first protrusion 122. The first stator yoke 112 has an annular structure. The first stator tooth 114 is disposed on the outer ring of the first stator yoke 112, and the first protrusion 122 is disposed on the inner ring of the first stator yoke 112. The first stator tooth 114 and the first protrusion 122 are disposed correspondingly.

[0098] Specifically, the outer ring of the first stator yoke 112 is provided with a plurality of first stator teeth 114, and the inner ring of the first stator yoke 112 is provided with a plurality of first protrusions 122. A first stator groove 116 is formed between adjacent first stator teeth 114, and a first winding groove is formed between adjacent first protrusions 122. The first winding groove and the first stator groove 116 are provided correspondingly, so that one side of the first winding 118 is located in the first stator groove 116, and the other side is located in the first winding groove.

[0099] In this embodiment, the first stator 110 further includes a plurality of first protrusions 122, wherein the first stator yoke 112 has an annular structure, the first stator teeth 114 are disposed on the outer ring of the first stator yoke 112, the first protrusions 122 are disposed on the inner ring of the first stator yoke 112, and one first protrusion 122 corresponds to one first stator tooth 114. A first winding groove is formed between adjacent first protrusions 122, and the first winding groove corresponds to the first stator groove 116. That is, the first winding 118 is wound in a set of corresponding first stator grooves 116 and first winding grooves. The first protrusions 122 are used to adjust the magnetic flux on the back of the first stator 110, thereby increasing the torque of the motor 100 and improving the efficiency of the motor 100.

[0100] Example 8:

[0101] like Fig. 3 , Fig. 4 , Fig. 5 , Fig. 9 , Fig. 11 and Fig. 13 As shown, based on any one of Embodiments 1 to 7, the second stator 140 further includes a second stator yoke 142, a second stator tooth 144, and a second protrusion 152. The second stator yoke 142 has an annular structure. The second stator tooth 144 is disposed in the inner ring of the second stator yoke 142, and the second protrusion 152 is disposed in the outer ring of the second stator yoke 142. The second stator tooth 144 and the second protrusion 152 are disposed correspondingly.

[0102] 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 second protrusions 152. A second stator slot 146 is formed between adjacent second stator teeth 144, and a second winding slot is formed between adjacent second protrusions 152. The second winding slot and the second stator slot 146 are provided correspondingly, so that one side of the second winding 148 is located in the second stator slot 146, and the other side is located in the second winding slot.

[0103] In this embodiment, the second stator 140 further includes a plurality of second protrusions 152, wherein the second stator yoke 142 has an annular structure, the second stator teeth 144 are disposed on the inner ring of the second stator yoke 142, the second protrusions 152 are disposed on the outer ring of the second stator yoke 142, and one second protrusion 152 corresponds to one second stator tooth 144. A second winding groove is formed between adjacent second protrusions 152, and the second winding groove corresponds to the second stator groove 146. That is, the second winding 148 is wound in a set of corresponding second stator grooves 146 and second winding grooves. The second protrusions 152 are used to adjust the magnetic flux on the back of the second stator 140, thereby increasing the torque of the motor 100 and improving the efficiency of the motor 100.

[0104] Example 9:

[0105] like Figs. 1 to 17 As shown, based on any of Embodiments 1 to 8, a first air gap 160 is further 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. In this embodiment, the first stator 110 and the rotor 130 are spaced apart to form the first air gap 160, and the second stator 140 and the rotor 130 are spaced apart to form the second air gap 170, thereby forming a double air gap structure, which can improve the torque of the motor 100.

[0106] Example 10:

[0107] like Fig. 17 As shown, based on Example 9, the ratio of the average diameter d1 of the first air gap 160 to the average diameter d2 of the second air gap 170 is greater than or equal to 0.1 and less than or equal to 0.95. That is, 0.1 ≤ d1 ÷ d2 ≤ 0.95.

[0108] In this embodiment, the ratio of the average diameter of the first air gap 160 and the average diameter of the second air gap 170 indirectly defines the inner diameter and the outer diameter of the rotor 130, thereby adjusting the structure of the entire motor 100, adjusting the distance between the first air gap 160 and the second air gap 170, and further adjusting the magnetic field to improve the torque per unit volume. When the ratio of the average diameter of the first air gap 160 and the average diameter of the second air gap 170 is greater than or equal to 0.1 and less than or equal to 0.95, the above-mentioned effects are optimal.

[0109] Specifically, the ratio of the average diameter d1 of the first air gap 160 and the average diameter d2 of the second air gap 170 is equal to greater than or equal to 0.3 and less than or equal to 0.95, that is, 0.3≤d1÷d2≤0.95.

[0110] Specifically, as shown in Table 1 below, the torque and output power of the motor provided by the present application are shown with different values of d1÷d2 between 0.1 and 0.95.

[0111] Table 1

[0112] d1 ÷ d2 0.3 0.75 0.9 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

[0113] In addition to the ratio of d1 and d2, other motor parameters are the same.

[0114] As shown in Table 1, the motor 100 provided by the present application has a ratio of the average diameter d1 of the first air gap 160 and the average diameter d2 of the second air gap 170 of 0.3, and the effective volume of the motor 100 is 137cm 3 , the input current is 0.2A, the torque is 0.23Nm, the rotational speed is 1000rpm, and the output power is 24.1W.

[0115] The motor 100 provided by the present application has a ratio of the average diameter d1 of the first air gap 160 and the average diameter d2 of the second air gap 170 of 0.75, and the effective volume of the motor 100 is 137cm 3 , the input current is 0.2A, the torque is 0.45Nm, the rotational speed is 1000rpm, and the output power is 47.1W.

[0116] The motor 100 provided by the present application has a ratio of the average diameter d1 of the first air gap 160 and the average diameter d2 of the second air gap 170 of 0.9, and the effective volume of the motor 100 is 137cm 3 , the input current is 0.2A, the torque is 0.3Nm, the rotational speed is 1000rpm, and the output power is 31.4W.

[0117] Example 11:

[0118] As Fig. 17As shown, on the basis of Embodiment 9 or Embodiment 10, further, the thickness d3 of the first air gap 160 and the thickness d4 of the second air gap 170 are in the range of 0.05 mm to 3 mm, and the thickness d3 of the first air gap 160 and the thickness d4 of the second air gap 170 can be the same or different. By means of the air gap with the above thickness, the overall air gap magnetic flux is adjusted, so as to balance the magnetic resistance and the harmonic magnetic field, and thus the magnetic resistance and the harmonic magnetic field of the entire motor 100 are balanced. The thickness d3 of the first air gap 160 is a radial dimension of the first air gap 160, and the thickness d4 of the second air gap 170 is a radial dimension of the second air gap 170.

[0119] Specifically, the thickness d3 of the first air gap 160 and the thickness d4 of the second air gap 170 can be equal or unequal.

[0120] Specifically, as shown in Table 2 below, the output power of the motor provided by the present application and the motor in the related art is shown. Wherein, the thickness of the first air gap 160 and the second air gap 170 is equal, and is gap.

[0121] Table 2

[0122] gap 0.03 mm 0.4 mm 4 mm 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

[0123] Wherein, other motor parameters are the same except for the gap.

[0124] As shown in Table 2, for the motor 100 provided by the present application, the thickness gap of the first air gap 160 and the second air gap 170 is 0.4 mm, the effective volume of the motor 100 is 137 cm 3 , the input current is 0.2 A, the torque is 0.45 Nm, the rotating speed is 1000 rpm, and the output power is 47.1 W.

[0125] For the motor in the related art, the thickness gap of the first air gap and the second air gap is 0.03 mm, the effective volume of the motor is 137 cm 3 , the input current is 0.2 A, the torque is 0.6 Nm, the rotating speed is 1000 rpm, and the output power is 62.8 W. However, the air gap is too high in precision requirement for the motor, which leads to the increase of the production cost of the motor, and in this state, the collision between the rotor and the first stator or the second stator is easy to occur due to the too small air gap, which affects the stability of the motor.

[0126] For the motor in the related art, the thickness gap of the first air gap and the second air gap is 4 mm, the effective volume of the motor is 137 cm 3 , the input current is 0.2 A, the torque is 0.15 Nm, the rotating speed is 1000 rpm, and the output power is 15.7 W.

[0127] In comparison, the motor provided by this invention has significantly higher torque and output power than motors in related technologies, and its cost is also lower.

[0128] Example 12:

[0129] like Figs. 1 to 16 As shown, based on any one of Embodiments 1 to 11, further, the number of first stator teeth 114 is multiple, and a first stator slot 116 is formed between adjacent first stator teeth 114; the number of second stator teeth 144 is multiple, and a second stator slot 146 is formed between adjacent second stator teeth 144; on a cross section perpendicular to the axial direction of the first stator 110, the ratio of the area of ​​all second stator slots 146 to the area of ​​all first stator slots 116 ranges from 1 to 100.

[0130] In this embodiment, a plurality of first stator teeth 114 are provided on the first stator yoke 112, and a first stator groove 116 is formed between adjacent first stator teeth 114. A plurality of second stator teeth 144 are provided on the second stator yoke 142, and a second stator groove 146 is formed between adjacent second stator teeth 144.

[0131] The ratio of the total cross-sectional area of ​​all second stator slots 146 (i.e., the total cross-sectional area of ​​all second stator slots 146) to the total cross-sectional area of ​​all first stator slots 116 (i.e., the total cross-sectional area of ​​all first stator slots 116) is greater than or equal to 1 and less than or equal to 100. This limits the number of windings accommodated in the first stator slots 116 and the second stator slots 146, thereby adjusting the overall magnetic field of the motor 100. Since the first stator 110 is located inside the rotor 130, its overall volume is relatively small. Therefore, limiting the cross-sectional area of ​​the first stator slots 116 to be no greater than the cross-sectional area of ​​the second stator slots 146 reduces interference from the magnetic field generated by the first stator 110, allowing the magnetic field generated by the first stator 110 to more smoothly coordinate with the magnetic field generated by the second stator 140, thereby improving the stability and efficiency of the motor 100.

[0132] Specifically, the ratio of the area of ​​all second stator slots 146 to the area of ​​all first stator slots 116 ranges from 1 to 20.

[0133] Example 13:

[0134] like Fig. 16 As shown, based on any of Embodiments 1 to 12, the number of first stator slots 116 is Ns1, and the included angle γ between the center line H1 of adjacent first stator slots 116 and the center line H2 of second stator teeth 144 is less than or equal to 45° ÷ Ns1.

[0135] In this embodiment, the number of the first stator slots 116 is Ns1, the included angle γ between the center line H1 of the adjacent first stator slots 116 and the center line H2 of the second stator teeth 144 is less than or equal to 45° ÷ Ns1, and 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, so as to adjust the magnetic field formed by the first stator 110 and the second stator 140, reduce the harmonic magnetic field, reduce the pulsation, reduce the vibration of the rotor 130, and improve the torque, the output power and the efficiency of the motor.

[0136] Specifically, as shown in Table 3 below, the torque, the output power and the efficiency of the motor and the related art when γ takes different values are provided. For example, Ns is equal to 12.

[0137] Table 3

[0138] γ -4° 0° 4° Copper loss (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％

[0139] In addition to γ, other motor parameters are the same.

[0140] As shown in Table 3, the motor 100 provided by the application, 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 4.4W, the iron loss is 4.14W, the torque is 0.41Nm, the output power is 43.15W, the input power is 51.7W, and the efficiency is 83.44%.

[0141] 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 4.4W, the iron loss is 4.95W, the torque is 0.36Nm, the output power is 37.81W, the input power is 47.2W, and the efficiency is 80.14%.

[0142] 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 4.4W, the iron loss is 2.84W, the torque is 0.37Nm, the output power is 39.18W, the input power is 46.4W, and the efficiency is 84.37%.

[0143] In comparison, the torque and the output power of the motor provided by the application are obviously higher than those of the motor in the related art.

[0144] Embodiment 14:

[0145] On the basis of any one of Embodiment 1 to Embodiment 13, 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 k1×d1÷Na, wherein 0.1 < k1 < 0.8.

[0146] 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 tooth 114 is k1×d1÷Na, 0.1 < k1 < 0.8, and further, the number of the first stator tooth 114 in the first stator 110, the width of the first stator tooth 114, and the average diameter of the first air gap 160 satisfy certain parameters, so that the size of the first stator slot 116 can be limited, so as to adjust the magnetic field distribution of the first stator yoke 112 and the first stator tooth 114, reduce the loss of the motor 100, improve the efficiency of the motor 100, and further, adjust the torque ripple and improve the efficiency of the motor 100.

[0147] Wherein, k1 represents the ratio of all the first stator teeth 114 in the circumference, 0.1 < k1 < 0.8.

[0148] Embodiment 15:

[0149] On the basis of any one of Embodiment 1 to Embodiment 13, further, the number of the second stator slots 146 is Na, the average diameter of the second air gap 170 is d2, and the width of the second stator tooth 144 is 3.14×k2×d2÷Na, wherein 0.1 < k2 < 0.8.

[0150] 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 tooth 144 is 3.14×k2×d2÷Na, 0.1 < k2 < 0.8, and further, the number of the second stator tooth 144 in the second stator 140, the width of the second stator tooth 144, and the average diameter of the second air gap 170 satisfy certain parameters, so that the size of the second stator slot 146 can be limited, so as to adjust the magnetic field distribution of the second stator yoke 142 and the second stator tooth 144, reduce the loss of the motor 100, improve the efficiency of the motor 100, and further, adjust the torque ripple and improve the efficiency of the motor 100.

[0151] Wherein, k2 represents the ratio of all the second stator teeth 144 in the circumference, 0.1 < k2 < 0.8.

[0152] Embodiment 16:

[0153] Based on any one of Embodiments 1 to 13, 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 teeth 114 is k1×d1÷Na, where 0.1 < k1 < 0.8. The number of the second stator slots 146 is Na, the average diameter of the second air gap 170 is d2, and the width of the second stator teeth 144 is 3.14×k2×d2÷Na, where 0.1 < k2 < 0.8.

[0154] 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 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 openings of the first stator slots 116 can be defined, thereby adjusting the magnetic field distribution of the first stator yoke 112 and the first stator teeth 114, reducing the losses of the motor 100, improving the efficiency of the motor 100, and also being able to adjust the torque ripple and improve the efficiency of the motor 100.

[0155] Among them, k1 represents the occupation ratio of all the first stator teeth 114 on the circumference, 0.1 < k1 < 0.8.

[0156] 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 3.14×k2×d2÷Na, 0.1 < k​​​​​​​​​​​​​The ratio of the total volume of the magnetic member 132 to the total volume of the magnetic conductive part 134 is greater than or equal to 0.6 and less than or equal to 6.

[0161] In this embodiment, the rotor 130 includes the magnetic conductive member and the magnetic member 132, the magnetic member 132 is arranged in the magnetic conductive part 134, the ratio of the total volume of the magnetic member 132 to the total volume of the magnetic conductive part 134 is greater than or equal to 0.6 and less than or equal to 6, so as to ensure that the magnetic member 132 is taken as a whole, so as to ensure the magnetic field strength of the rotor 130, improve the torque of the motor 100, and improve the efficiency of the motor 100.

[0162] Specifically, the ratio of the total volume of the magnetic member 132 to the total volume of the magnetic conductive part 134 is 0.6 to 5.

[0163] Of course, in other embodiments of the present application, the total volume of the magnetic member 132 and the total volume of the magnetic conductive part 134 can be 1.15.

[0164] Specifically, as shown in Table 4 below, the output power of the motor provided by the present application and the motor in the related art is shown.

[0165] Table 4

[0166] B 0.3 1 7 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

[0167] Wherein, other motor parameters are the same except B.

[0168] As shown in Table 4, the ratio B of the total volume of the magnetic member 132 to the total volume of the magnetic conductive part 134 of the motor 100 provided by the present application is equal to 1, the effective volume of the motor 100 is 137cm 3 , the input current is 0.2A, the torque is 0.45Nm, the speed is 1000rpm, and the output power is 47.1W.

[0169] The ratio B of the total volume of the magnetic member to the total volume of the magnetic conductive part of the motor in the related art is equal to 0.3, the effective volume of the motor is 137cm 3 , the input current is 0.2A, the torque is 0.27Nm, the speed is 1000rpm, and the output power is 28.3W.

[0170] The ratio B of the total volume of the magnetic member to the total volume of the magnetic conductive part of the motor in the related art is equal to 7, the effective volume of the motor is 137cm 3 , the input current is 0.2A, the torque is 0.33Nm, the speed is 1000rpm, and the output power is 34.5W.

[0171] In comparison, the torque and output power of the motor provided by the present application are significantly higher than those of the motor in the related art.

[0172] Embodiment 18:

[0173] Further based on any one of Embodiment 17, 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 windings 118 is Pa1, Pa1 = |Ns1 ± Zr ÷ 2|.

[0174] In this embodiment, the number of the magnetic conductive portions 134 is Zr, the number of the stator slots of the first stator 110 is Ns1, and the number of pole pairs of the first winding is Pa1, Pa1 = |Ns1 ± Zr ÷ 2|, by adjusting the number of the first stator teeth 114, the number of pole pairs of the first winding 118 and the number of the magnetic conductive portions 134, the motor 100 is more stable, and the torque of the motor 100 is improved.

[0175] Embodiment 19:

[0176] Further based on any one of Embodiment 17 or Embodiment 18, 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 windings 148 is Pa2, Pa2 = |Ns2 ± Zr ÷ 2|.

[0177] In this embodiment, the number of the magnetic conductive portions 134 is Zr, the number of the stator slots of the second stator 140 is Ns2, and the number of pole pairs of the second winding is Pa2, Pa2 = |Ns2 ± Zr ÷ 2|, by adjusting the number of the second stator teeth 144, the number of pole pairs of the second winding 148 and the number of the magnetic conductive portions 134, the motor 100 is more stable, and the torque of the motor 100 is improved.

[0178] Embodiment 20:

[0179] Further based on any one of Embodiment 1 to Embodiment 19, 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 12 ÷ Pa1 ÷ (K1 + 1), the number of pole pairs of the first windings 118 on the first stator 110 is Pa1, and K1 is the number of the first recesses 126 on one first stator tooth 114.

[0180] In this embodiment, the ratio of the axial length of the first stator 110 to the outer diameter of the first stator 110 is reduced, the number of pole pairs of the first stator 110 is usually an integer greater than 1, and the number of the first stator teeth 114 is usually an integer greater than 2, thereby reducing the axial length of the first stator 110, reducing the volume of the first stator 110, making the motor 100 compact, and facilitating the reduction of the volume of the motor 100.

[0181] Embodiment 21:

[0182] On the basis of any one of Embodiment 1 to Embodiment 20, further, a ratio of an axial length of the second stator 140 to an outer diameter of the second stator 140 is less than or equal to 1.6 ÷ Pa2, Pa2 being a number of pole pairs of the second winding 148 on the second stator 140.

[0183] In this embodiment, the ratio of the axial length of the second stator 140 to the outer diameter of the second stator 140 is reduced, while the number of pole pairs of the second stator 140 is generally an integer greater than 1, thereby reducing the axial length of the second stator 140, reducing the volume of the second stator 140, making the motor 100 compact, and facilitating reduction of the volume of the motor 100. Specifically, 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 3.

[0184] As shown in Fig. 18 , the motor 100 provided by the present application has higher torque density when the length-diameter ratio is not greater than 3, compared with the motor of the related art which adopts a concentrated winding and a tooth-wound winding.

[0185] Embodiment 22:

[0186] As shown in Fig. 6 , Fig. 8 , Fig. 9 , Fig. 11 , Fig. 12 , Fig. 13 and Fig. 15 , on the basis of any one of Embodiment 1 to Embodiment 21, further, the first stator slot 116 is provided with a first recess 126 on a side facing the rotor 130.

[0187] In this embodiment, the first stator tooth 114 is provided with the first recess 126 on a side facing the rotor 130, dividing the first stator tooth 114 into a plurality of first stator convex teeth 124, thereby adjusting the air gap and modulating the magnetic field by means of the form of the first recess 126 and the first stator convex teeth 124, improving the efficiency of the motor 100.

[0188] Embodiment 23:

[0189] As shown in Fig. 7 , Fig. 8 , Fig. 12 and Fig. 15 , on the basis of any one of Embodiment 1 to Embodiment 22, further, the second stator tooth 144 is provided with a second recess 156 on a side facing the rotor 130.

[0190] In this embodiment, the second stator tooth 144 is provided with a second recess 156 on one side facing the rotor 130, and the second stator tooth 144 is divided into a plurality of second stator teeth 154, and the air gap is adjusted and the magnetic field is modulated by the form of the second recess 156 and the second stator tooth 154, and the efficiency of the motor 100 is improved.

[0191] Wherein, the ratio of the total cross-sectional area of all the first stator slots 116 to the total cross-sectional area of all the first recesses 126 is greater than or equal to 1 and less than or equal to 80.

[0192] In this embodiment, the ratio of the total cross-sectional area of all the second stator slots 146 to the total cross-sectional area of all the second recesses 156 is greater than or equal to 1 and less than or equal to 80, and the area of the second stator slot 146 and the second recess 156 is limited to adjust the air gap, and the area of the second recess 156 is not greater than the area of the second stator slot 146, thereby ensuring the winding amount of the second stator slot 146 and avoiding the second stator 140 being unstable due to the second stator slot 146 being too small, thereby balancing the efficiency and vibration of the motor 100.

[0193] Wherein, when the cross-sectional area of the second recess 156 and the cross-sectional area of the second stator slot 146 are different, and the cross-sectional area of the second stator 140 facing the adjacent two slots of the rotor 130 is different, thereby forming different air gap magnetic flux, thereby reducing the harmonic magnetic field to improve the stability of the motor 100 and reduce the vibration of the motor 100.

[0194] Embodiment 24:

[0195] On the basis of any one of embodiments 1 to 23, further, the ratio of the pole pair number of the rotor 130 and the magnetic member 132 to the number of the second stator slots 146 is 0.5 to 2.5.

[0196] In this embodiment, the ratio of the pole pair number of the rotor 130 and the magnetic member 132 forming an integral structure to the number of the second stator slots 146 is greater than or equal to 0.5 and less than or equal to 2.5, thereby improving the torque of the motor 100.

[0197] For example: the pole pair number of the rotor 130 and the magnetic member 132 forming an integral structure is 2, and the number of the second stator slots 146 is 20. The pole pair number of the rotor 130 and the magnetic member 132 forming an integral structure is 4, and the number of the second stator slots 146 is 20.

[0198] Embodiment 25:

[0199] As Fig. 1As shown, the motor 100 provided by the application comprises a first stator, a second stator and a rotor 130. The first stator 110 and the second stator are different in outer diameter and are concentrically arranged. The second winding is arranged on the second stator only.

[0200] The rotor 130 comprises a magnetic piece 132 and a magnetic conducting part 134.

[0201] The second stator comprises a second stator yoke, a second stator tooth protruding radially inward from the second stator yoke and a second protruding part protruding radially outward from the second stator yoke.

[0202] The rotor 130 and the first stator form a first air gap 160, and the rotor 130 and the second stator form a second air gap 170. The ratio of the diameters of the first air gap and the second air gap is 0.6.

[0203] The second winding adopts a concentrated winding and is wound on the second stator yoke only.

[0204] The first stator is not provided with the first winding, is provided with a first stator slot, and a first stator tooth is formed between two adjacent first stator slots.

[0205] The ratio of the axial length and the outer diameter of the second stator tooth structure of the second stator is 0.27.

[0206] The included angle γ between the center line H2 of the second stator tooth of the second stator and the center line H1 of the first stator slot is not greater than 3.75°.

[0207] The axial length of the first stator, the axial length of the second stator, the axial length of the magnetic piece 132 and the axial length of the magnetic conducting part 134 are the same.

[0208] The magnetic conducting part 134 is connected through a magnetic conducting bridge.

[0209] The polarities of two adjacent permanent magnets are opposite, forming a magnetic convergence effect.

[0210] The plurality of magnetic pieces 132 are arranged in a spoke type magnet arrangement.

[0211] The pole pair number Pa2 of the second stator is 2, the number Zr of the magnetic conducting part 134 is 20, and the total slot number Ns1 of the second stator is 12. The formula Pa1=|Ns1±Zr÷2| is satisfied.

[0212] The first stator, the second stator and the main part of the magnetic conducting part 134 are all constructed in a laminated silicon steel sheet manner.

[0213] The second winding is an aluminum wire.

[0214] The magnetic piece 132 is a ferrite.

[0215] Or the second stator yoke is protruded only on one side to form the second stator tooth, and the second winding is wound on the second stator yoke.

[0216] The ratio of the axial length of the second stator to the outer diameter is about 0.2.

[0217] Embodiment 26:

[0218] As shown in Fig. 5 The motor 100 provided by the application comprises a first stator, a second stator and a rotor 130. The first stator 110 and the second stator are different in outer diameter and are concentrically arranged. The second winding is arranged only in the second stator.

[0219] The rotor 130 comprises a magnetic member 132 and a magnetic conducting part 134.

[0220] The second stator comprises a second stator yoke, a second stator tooth protruded inwardly along the radial direction of the second stator yoke from the second stator yoke, and a second protrusion part protruded outwardly along the radial direction of the second stator yoke from the second stator yoke.

[0221] The rotor 130 and the second stator form a second air gap, and the rotor 130 and the first stator form a first air gap. The ratio of the diameter of the first air gap to the diameter of the second air gap is 0.56.

[0222] The second winding adopts a concentrated winding and is wound only on the second stator yoke.

[0223] The first stator is not provided with the first winding, is provided with the first stator slot, and the first stator tooth is formed between two adjacent first stator slots.

[0224] The number of the first stator slots of the first stator is 12, the number of pole pairs of the rotor 130 is 10, and the number of pole pairs formed by the first winding 118 is 2.

[0225] The ratio of the number of pole pairs of the rotor 130 to the number of the second stator slots of the second stator is 0.83.

[0226] The ratio of the number of pole pairs of the rotor 130 to the number of pole pairs of the second winding is 5.

[0227] On the same cross section, the ratio of the total area of the second stator slots in the second stator to the total area of the first stator slots of the first stator is 1 to 20.

[0228] The ratio of the total volume of the magnetic member 132 to the total volume of the magnetic conducting part 134 is 1.15.

[0229] The average diameter of the first air gap 160 is d1, the average diameter of the second air gap 170 is d2, the width of the first stator tooth 114 is k1×d1÷Ns1, and the width of the second stator tooth is 3.14×k2×d2÷Ns2, wherein 0.1<k1<0.8 and 0.1<k2<0.8.

[0230] Specifically, the average diameters of the first air gap 160 and the second air gap 170 are 51 mm and 28.6 mm respectively, the tooth width of the second stator tooth is 4 mm, and the tooth width of the first stator tooth is 1.8 mm. k1 = 0.3, and k2 = 0.24.

[0231] The thicknesses of the first air gap 160 and the second air gap 170 are 0.35 mm.

[0232] The ratio of the outer diameter of the first stator to the outer diameter of the second stator is about 0.28.

[0233] The included angle between the center line H1 of the first stator slot and the center line H2 of the second stator tooth 144 is not greater than 3.75°.

[0234] The axial length of the first stator, the axial length of the second stator, the axial length of the magnetic member 132, and the axial length of the magnetic conductive part 134 are all the same.

[0235] The magnetic conductive part 134 is connected through a magnetic conductive bridge.

[0236] The polarities of the two adjacent permanent magnets are opposite, forming a magnetic convergence effect.

[0237] The plurality of magnetic members 132 are arranged in a spoke type magnet arrangement.

[0238] The pole pair number Pa2 of the second stator is 2, the number Zr of the magnetic conductive part 134 is 20, and the total slot number Ns2 of the second stator 140 is 12. The formula Pa2 = |Ns2 ± Zr ÷ 2| is satisfied.

[0239] The first stator, the second stator, and the main part of the magnetic conductive part 134 are all constructed in a laminated silicon steel sheet manner.

[0240] The first winding 118 is an aluminum wire.

[0241] The magnetic member 132 is a ferrite.

[0242] Alternatively, the second stator yoke protrudes on only one side to form the second stator tooth, and the second winding is wound around the second stator yoke.

[0243] Embodiment 27:

[0244] As shown in Fig. 6 The motor 100 provided by the application includes a first stator, a second stator, and a rotor 130. The first stator 110 and the second stator are different in outer diameter and are concentrically arranged. The second stator is provided with a second winding.

[0245] The rotor 130 includes a magnetic member 132 and a magnetic conductive part 134.

[0246] The second stator comprises a second stator yoke and second stator teeth protruding radially inward from the second stator yoke.

[0247] The rotor 130 and the second stator form a second air gap, and the rotor 130 and the first stator form a first air gap. The ratio of the diameters of the first air gap and the second air gap is 0.6.

[0248] The second winding adopts a concentrated winding and is wound only on the second stator yoke.

[0249] The first stator teeth of the first stator are provided with the first winding, and the first stator teeth are provided with first recesses, so that the first stator teeth are divided into a plurality of first stator teeth.

[0250] The ratio of the axial length and the outer diameter of the second stator is about 0.27.

[0251] The included angle between the center line H1 of the first stator slot and the center line H2 of the second stator tooth is not greater than 3.75°.

[0252] The axial length of the first stator, the axial length of the second stator, the axial length of the magnetic member 132, and the axial length of the magnetic conducting part 134 are the same.

[0253] The magnetic conducting part 134 is connected through a magnetic conducting bridge.

[0254] The polarities of the two adjacent permanent magnets are opposite, forming a magnetic convergence effect.

[0255] The plurality of magnetic members 132 are arranged in a spoke type magnet arrangement.

[0256] The pole pair number Pa2 of the second stator is 2, the number Zr of the magnetic conducting part 134 is 20, and the total slot number Ns2 of the second stator 140 is 12. The formula Pa2 = |Ns2 ± Zr ÷ 2| is satisfied.

[0257] The first stator, the second stator, and the main part of the magnetic conducting part 134 are all constructed in a laminated silicon steel sheet manner.

[0258] The first winding 118 is an aluminum wire.

[0259] The magnetic member 132 is a ferrite.

[0260] Embodiment 28:

[0261] The motor 100 provided by the application comprises a first stator, a second stator, and a rotor 130 arranged between the first stator and the second stator, wherein the rotor 130 comprises a magnetic conducting part 134 and a magnetic member 132.

[0262] The second stator is provided with 12 second stator slots, and the second stator slots are provided with second windings, and one side of the second windings is placed in the second stator slots, and the other side is placed in the back of the second stator yoke.

[0263] Each of the second windings has and only one side placed in the opening slots of the second stator slots. In order to ensure that the span of the electromagnetic coil is minimum, the other side is placed in the second winding slots on the outer side closest to the second stator slots. Finally, the second windings become yoke windings, which are wound on the second stator yoke. The first stator is provided with 12 first stator slots, and the first stator slots are provided with first windings.

[0264] The rotor 130 and the first stator form a first air gap 160, and the rotor 130 and the second stator form a second air gap 170. The ratio of the diameters of the first air gap and the second air gap is 0.6.

[0265] The included angle between the center line H1 of the first stator slot and the center line H2 of the second stator tooth is not greater than 3.75°.

[0266] The ratio of the axial length of the second stator to the outer diameter is less than 3.

[0267] The axial length of the first stator, the axial length of the second stator, the axial length of the magnetic member 132, and the axial length of the magnetic conducting part 134 are the same.

[0268] The magnetic conducting part 134 is connected through a magnetic conducting bridge.

[0269] The polarities of the adjacent two permanent magnets are opposite, forming a magnetic convergence effect.

[0270] The plurality of magnetic members 132 are arranged in a spoke type magnet arrangement.

[0271] The pole pair number Pa2 of the second stator is 2, the number Zr of the magnetic conducting part 134 is 20, and the number Ns2 of the second stator slots 146 of the second stator 140 is 12. The formula Pa2 = |Ns2 ± Zr ÷ 2| is satisfied.

[0272] The first stator, the second stator, and the main part of the magnetic conducting part 134 are all constructed in a laminated silicon steel sheet manner.

[0273] The first windings 118 are copper wires.

[0274] The magnetic member 132 is neodymium iron boron.

[0275] As shown in Fig. 18 When the aspect ratio is not greater than 3, the motor 100 provided by the application has higher torque density.

[0276] Embodiment 29:

[0277] The motor 100 comprises a first stator 110, a second stator 140 and a rotor 130. The first stator 110 and the second stator 140 are concentrically arranged with different outer diameters. The first stator 110 is provided with first windings 118.

[0278] The second stator 140 is provided with six second stator slots 146 and six second recesses 156 on the inner side. The second windings 148 are placed in the second stator slots 146, and no winding is placed in the second recesses 156. The ratio of the total area sum of all the second stator slots 146 to the total area sum of the second recesses 156 is 17. The second windings 148 adopt concentrated windings, and each winding only spans one second stator tooth 144.

[0279] The first stator 110 is provided with twelve first stator slots 116, and the first windings 118 are wound on the first stator yoke 112 of the first stator 110. Each of the first windings 118 has and only has one side placed in the first stator slot 116 on the side of the first stator 110 facing the rotor 130, and the other side is placed in the first stator slot 116 farthest from the rotor 130 or the back of the first stator yoke 112 to ensure that the span of the second windings 148 across the first stator yoke 112 on the first stator 110 is minimized.

[0280] The pole pair number of the rotor 130 is 10, the number of the first stator slots 116 is 12, the ratio of the pole pair number of the rotor 130 to the number of the first stator slots 116 is 0.833, the pole pair number of the rotor 130 is 10, the total number of the second stator slots 146 and the second recesses 156 is 12, the ratio of the pole pair number of the rotor 130 to the total number of the second stator slots 146 and the second recesses 156 is 0.833, the pole pair number of the first stator 110 winding is 2, the ratio of the pole pair number Pr of the rotor 130 to the pole pair number of the second windings 148 is 5, the ratio of the total volume of the magnetic member 132 to the total volume of the magnetic conductive part 134 is 0.55, and the thickness of the first air gap 160 and the second air gap 170 is 0.4 mm.

[0281] The average diameter of the first air gap 160 formed by the first stator 110 and the rotor 130 is d1, and the width of the first stator tooth 114 is k1×d1÷Ns1, wherein k1=0.3.

[0282] The average diameter of the second air gap 170 formed by the second stator 140 and the rotor 130 is d2, the minimum width of the tooth body of the second stator tooth 144 of the second stator 140 is k2×d2÷Ns2, and the maximum width of the tooth crown of the second stator tooth 144 is k2’×d2÷Ns2, wherein k2=0.2 and k2’=0.8.

[0283] The rotor 130 is located between the first stator 110 and the second stator 140, and is composed of a magnetic piece 132 and a magnetic conducting part 134.

[0284] The rotor 130, the first stator 110 and the second stator 140 form two air gaps with different diameters, i.e., 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. The ratio of the average diameter of the first air gap 160 to the average diameter of the second air gap 170 is 0.6.

[0285] The included angle between the center line H1 of the first stator slot 116 and the center line H2 of the second stator tooth 144 is not greater than 3.75°.

[0286] The ratio of the axial length of the second stator 140 to the outer diameter is less than 3.

[0287] The axial length of the first stator 110, the axial length of the second stator 140, the axial length of the magnetic piece 132 and the axial length of the magnetic conducting part 134 are the same.

[0288] The magnetic conducting part 134 is connected through a magnetic conducting bridge.

[0289] The polarities of the two adjacent permanent magnets are opposite, forming a magnetic aggregation effect.

[0290] The plurality of magnetic pieces 132 are arranged in a spoke type magnet arrangement.

[0291] The pole pair number Pa2 of the second stator 140 is 2, the number Zr of the magnetic conducting part 134 is 20, and the total number Ns2 of the second stator slots 146 is 12. The formula Pa2 = |Ns2 ± Zr ÷ 2| is satisfied.

[0292] The main part of the first stator 110, the second stator 140 and the magnetic conducting part 134 are all constructed in a laminated silicon steel sheet manner.

[0293] The first winding 118 and the second winding 148 are copper wires.

[0294] The magnetic piece 132 is a neodymium iron boron.

[0295] Embodiment 30:

[0296] The application provides an electric appliance device, which comprises the motor 100 provided in any of the above embodiments.

[0297] The motor 100 provided by the application has all the beneficial effects of the motor 100 provided by any of the above embodiments, and thus, the beneficial effects of the motor 100 provided by any of the above embodiments are not repeated here.

[0298] Specifically, the electric appliance device comprises a washing machine, a blender or a compressor, etc.

[0299] In the present application, the terms "first", "second", "third" are used only for descriptive purposes and are not to be construed as indicating or implying relative importance of the indicated elements. The term "a plurality" refers to two or more, unless otherwise explicitly indicated. The terms "mounting", "connected", "connecting", "fixed", and the like are to be construed broadly, for example, "connected" can be fixed connection, or detachable connection, or integral connection; "connected" can be direct connection, or indirect connection through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0300] In the description of the present application, it should be understood that the terms "upper", "lower", "left", "right", "front", "back", etc. indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or unit referred to must have a particular direction, be constructed and operated in a particular orientation, therefore, it cannot be understood as a limitation on the present application.

[0301] In the description of the present application, the terms "one embodiment", "some embodiments", "a specific embodiment", etc. mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0302] The above is only the preferred embodiment of the present application, and is not intended to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. An electric machine characterized in that, The motor comprises: a first stator comprising a first stator yoke and first stator teeth arranged on the first stator yoke; a rotor sleeved outside the first stator; a first recess is arranged on one side of the first stator teeth facing the rotor, the first recess divides the first stator teeth into a plurality of first stator teeth protrusions; a second stator sleeved outside the rotor, the second stator comprising a second stator yoke and second stator teeth arranged on the second stator yoke; a winding arranged on the first stator yoke and / or the second stator yoke; 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; a ratio of an average diameter of the first air gap to an average diameter of the second air gap ranges from 0.1 to 0.95; the number of the first stator teeth is a plurality, a first stator slot is formed between adjacent first stator teeth, the number of the second stator teeth is a plurality, and a second stator slot is formed between adjacent second stator teeth; the number of the first stator slots is equal to the number of the second stator slots, both being 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 teeth is k1×d1÷Na, and the width of the second stator teeth is 3.14×k2×d2÷Na, wherein k1 represents the proportion of all the first stator teeth in the circumference, k2 represents the proportion of all the second stator teeth in the circumference, 0.1 2. The motor of claim 1, wherein: the winding is a concentrated winding.

3. The motor of claim 1, wherein: the first stator teeth extend from the first stator yoke toward the rotor; and / or the second stator teeth extend from the second stator yoke toward the rotor.

4. The motor of claim 3, wherein: the first stator further comprises: a first protrusion extending from the first stator yoke away from the rotor, the first protrusion corresponding to the first stator teeth; and / or the second stator further comprises: a second protrusion extending from the second stator yoke away from the rotor, the second protrusion corresponding to the second stator teeth.

5. The motor of any one of claims 1 to 4, wherein: a thickness of the first air gap and a thickness of the second air gap range from 0.05 mm to 3 mm.

6. The motor of any one of claims 1 to 4, wherein: in a cross section perpendicular to the first stator axis, a ratio of an area of all the second stator slots to an area of all the first stator slots ranges from 1 to 100.

7. The motor of claim 6, wherein: The number of the first stator slots is Ns1, and an included angle between a center line of the second stator slot adjacent to each other and a center line of the first stator tooth is less than or equal to 45° ÷ Ns1, Ns1 representing the number of the first stator slots.

8. The electric machine of claim 6, wherein, The rotor comprises: A plurality of magnetic conductive portions; A plurality of magnetic members, the magnetic conductive portions and the magnetic members being annularly spliced into an annular structure, the magnetic members being arranged between adjacent magnetic conductive portions, and a ratio of a total volume of the magnetic members to a total volume of the magnetic conductive portions being in a range of 0.6 to 6.

9. The motor of claim 8, wherein, The number of the magnetic conductive portions is Zr, the number of the first stator slots is Ns1, and a pole pair number Pa1 of the winding on the first stator is Pa1 = |Ns1 ± Zr ÷ 2|; and / or The number of the magnetic conductive portions is Zr, the number of the second stator slots is Ns2, and a pole pair number Pa2 of the winding on the second stator is Pa2 = |Ns2 ± Zr ÷ 2|.

10. The motor of claim 9, wherein, A first recess is arranged on a side of the first stator tooth facing the rotor; and / or A second recess is arranged on a side of the second stator tooth facing the rotor.

11. The motor of claim 9, wherein, A ratio of an axial length of the first stator to an outer diameter of the first stator is less than or equal to 12 ÷ Pa1 ÷ (K1 + 1), K1 being the number of the first recesses on the first stator tooth.

12. The motor of any one of claims 1 to 4, wherein, A ratio of an axial length of the second stator to an outer diameter of the second stator is less than or equal to 1.6 ÷ Pa2, Pa2 being the pole pair number of the winding on the second stator.

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

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