Stator assembly and motor

Abstract

The present disclosure proposes a stator assembly including a stator core including an annular stator yoke and a plurality of stator teeth connected to a radially inner side of the stator yoke, the plurality of stator teeth being spaced apart from each other in a circumferential direction; each phase of winding comprises a first coil group and a second coil group, each stator tooth is wound with one first coil and one second coil, the first coil group comprises at least one first coil, and the second coil group comprises at least one second coil; the first coil of the first coil group and the second coil of the second coil group are wound on the same stator teeth; three first terminals, wherein the first coil group of the three-phase winding is electrically connected to one of the three first terminals; and three second terminals, wherein the second coil group of the three-phase winding is electrically connected to one of the three second terminals. And the first terminals and the second terminals are electrically connected in pairs, so that the first coil group and the second coil group in each phase winding are connected in parallel.

Description

Technical Field

[0001] The present disclosure relates to the field of electric motors, and more particularly to a stator assembly and an electric motor including the stator assembly. Background Art

[0002] There are mainly three types of wires used in current motor windings: enameled copper wires, enameled aluminum wires, and copper-clad aluminum wires. In terms of quality, copper wires are the best, but the price of copper is currently high, and using all copper wires will inevitably greatly increase the cost of the motor. Some motors use enameled aluminum wires or copper-clad aluminum wires to replace copper wires to reduce costs, that is, enameled aluminum wires and enameled copper wires are used for winding at the same time.

[0003] Generally, enameled copper wires and enameled aluminum wires are connected to the same terminal, but this wiring method poses higher requirements for the automated welding of the terminal. First, an enameled layer is coated on the outer layer of the enameled wire. If the temperature is too high, the wire will break; if the temperature is too low, the enameled layer will not break, resulting in poor welding. Second, there are two types of enameled wires, enameled copper wires and enameled aluminum wires, on the terminal, and the welding conditions are more stringent. If the welding is not well controlled, not only will the wire break or there be poor contact, but if the welding causes the copper wire and aluminum wire at the terminal to be exposed to the air, the aluminum wire will oxidize, and electrochemical corrosion will occur between the copper wire and the aluminum wire, causing the aluminum wire to overheat or break, ultimately resulting in a reduction in the motor efficiency or the service life of the motor.

[0004] Therefore, a structure that can optimize the connection between the enameled copper wire and the enameled aluminum wire and the terminal is needed. Summary of the Utility Model

[0005] The object of the present disclosure is to at least solve the disadvantages existing in the prior art. The present disclosure provides a stator assembly, including a stator core, which includes an annular stator yoke and a plurality of stator teeth connected to the radial inner side of the stator yoke, and the plurality of stator teeth are spaced apart from each other circumferentially; a winding, each phase winding includes a first coil group and a second coil group, one first coil and one second coil are wound around each of the stator teeth, the first coil group includes at least one first coil, the second coil group includes at least one second coil, the first coil of the first coil group and the second coil of the second coil group of each phase winding are wound around the same stator tooth; a first terminal, the first coil groups of each phase winding are respectively electrically connected to a first terminal; a second terminal, the second coil groups of each phase winding are respectively electrically connected to a second terminal. The first terminal and the second terminal are electrically connected in pairs such that the first coil group and the second coil group in each phase winding are connected in parallel.

[0006] For example, according to some embodiments of the present disclosure, the first coil group includes a plurality of first coils connected in series, and the second coil group includes a plurality of second coils connected in series.

[0007] For example, according to some embodiments of the present disclosure, the first coil and the second coil are wound with wires of different materials.

[0008] For example, according to some embodiments of the present disclosure, the first coil is wound with a copper wire, and the second coil is wound with an aluminum wire.

[0009] For example, according to some embodiments of the present disclosure, the first coil is wound around the stator teeth, and the second coil is wound around the periphery of the first coil.

[0010] For example, according to some embodiments of the present disclosure, the windings of the first coil group are welded to the first terminal, and the windings of the second coil group are welded to the second terminal.

[0011] For example, according to some embodiments of the present disclosure, the windings are arranged in a concentrated winding manner.

[0012] For example, according to some embodiments of the present disclosure, the wiring type of the windings is Y-type wiring.

[0013] For example, according to some embodiments of the present disclosure, the stator assembly further includes a plastic encapsulation part that surrounds the windings and also surrounds the electrical connection points between the first terminal and the second terminal and the first coil group and the second coil group respectively, and the free ends of the first terminal and the second terminal are exposed outside the plastic encapsulation part.

[0014] The present disclosure also provides a motor including the stator assembly according to any one of the above embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A perspective view showing a stator core and windings according to an embodiment of the present disclosure;

[0016] Figure 2 A cross-sectional view showing a part of the stator assembly taken along a plane passing through the central axis of the stator assembly;

[0017] Figure 3 A schematic connection diagram showing the first coil and the second coil;

[0018] Figure 4 A graph showing the efficiency comparison between the motor according to the present disclosure and a copper wire motor;

[0019] Figure 5 A graph showing the efficiency difference between the motor according to the present disclosure and a copper wire motor;

[0020] Figure 6 A schematic diagram showing the cooperation between the winding according to the present disclosure and a terminal;

[0021] Figure 7Schematic diagram showing the electrical connection of the first terminal and the second terminal according to the present disclosure;

[0022] Figure 8 Cross-sectional schematic diagram showing the encapsulation part surrounding other components according to the present disclosure taken at the first terminal;

[0023] Figure 9 Stereoscopic schematic diagram showing the stator assembly according to the present disclosure.

[0024] Reference numerals

[0025] 1 - Stator core

[0026] 11 - Stator yoke

[0027] 12 - Stator teeth

[0028] 2 - Winding

[0029] 21 - First coil

[0030] 211 - First winding

[0031] 22 - Second coil

[0032] 221 - Second winding

[0033] 3 - Stator skeleton

[0034] 41 - First terminal

[0035] 42 - Second terminal

[0036] 43 - Connecting piece

[0037] 5 - Encapsulation part Detailed implementation manners

[0038] In order to make the objectives, solutions, and advantages of the technical solutions of the present disclosure clearer, the technical solutions of the embodiments of the present disclosure will be clearly and completely described below in conjunction with the drawings of the specific embodiments of the present disclosure. Unless otherwise specified, the terms used herein have the ordinary meanings in the art. The same reference numerals in the drawings represent the same components.

[0039] In the description of the present disclosure, it should be noted that unless otherwise clearly defined and limited, the terms "mounted", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present disclosure can be understood according to specific situations.

[0040] In the present disclosure, for ease of description, the extending direction of the central axis of the annular stator yoke is designated as the axial direction, the radial direction of the annular stator yoke is designated as the radial direction, and the direction surrounding the central axis of the annular stator yoke is designated as the circumferential direction.

[0041] The present disclosure provides a stator assembly having a first coil 21 and a second coil 22. The stator assembly includes a stator core 1, and the first coil 21 and the second coil 22 are wound around the stator core 1. Specifically, the stator core 1 of the stator assembly may include an annular stator yoke 11 and a plurality of stator teeth 12 connected to the radially inner side of the stator yoke 11. The plurality of stator teeth 12 are spaced apart from each other circumferentially, in particular, evenly spaced apart at equal intervals, thereby leaving space for winding the first coil 21 and the second coil 22. For example, the number of stator teeth 12 is, for example, 12 as shown in Figure 1 the figure, but the number of stator teeth in the present disclosure is not limited to 12, and may also be 3, 6, 9, 15, 18, 21, 24, etc. The radially inner tips of the stator teeth 12 extend at least partially along the circumferential direction to both sides, so as to form wire grooves on both circumferential sides, which is convenient for winding and can be used to prevent the coil from coming off.

[0042] The stator core 1 can be made by stamping and stacking silicon steel sheets. Specifically, a plurality of silicon steel sheets can be stamped into a predetermined shape and fixed to each other by riveting. The thickness of the silicon steel sheet can be 0.2 mm - 0.5 mm, preferably, the thickness of the silicon steel sheet can be 0.35 mm.

[0043] In addition, the stator core 1 can also be made of soft magnetic composite material (SMC material) by powder metallurgy. The stator core 1 can be integrally formed, or can be made into stator blocks, and then a plurality of stator blocks are spliced into the stator core 1. Other methods for forming the stator core are equally applicable to the present disclosure.

[0044] The stator assembly according to the present disclosure may further include a stator skeleton 3. The stator skeleton 3 can be wrapped around both sides of the stator core 1 axially to form wire grooves for accommodating the coils on both axial sides of the stator core 1, as shown in Figure 1 and Figure 2 the figure. This facilitates the winding of the first coil 21 and the second coil 22, is beneficial to supporting the first coil 21 and the second coil 22, and resists the action of electromagnetic force, prevents the coil from deforming and causing a short circuit, and reduces the probability of the motor malfunctioning.

[0045] The number of windings 2 is set to 3, and the three-phase windings 2 are independent of each other and correspond to the three phases respectively. The winding 2 may include at least one first coil 21 and at least one second coil 22, and in particular, include a first coil group formed by a plurality of first coils 21 connected in series and a second coil group formed by a plurality of second coils 22 connected in series. The number of first coils 21 of the first coil group is the same as the number of second coils 22 of the second coil group. For each phase winding 2, the first coil 21 of the first coil group and the second coil 22 of the second coil group are wound on the same stator tooth.

[0046] Furthermore, the first coil 21 and the second coil 22 of the three-phase winding 2 are wound around adjacent stator teeth in a cyclic and alternating manner, that is, the first coil 21 and the second coil 22 of the same phase winding are wound around adjacent stator teeth with two stator teeth between them. Figure 1 The 12 stator teeth are numbered 1-12 in sequence, then the first coil 21 and the second coil 22 of one phase winding 2 are wound on No. 1, No. 4, No. 7, and No. 10, the first coil 21 and the second coil 22 of another phase winding 2 are wound on No. 2, No. 5, No. 8, and No. 11, and the first coil 21 and the second coil 22 of the remaining phase winding 2 are wound on No. 3, No. 6, No. 9, and No. 12.

[0047] The first coil 21 and the second coil 22 include different conductive materials. Specifically, the first coil 21 includes a first material for conducting electricity, and the second coil 22 includes a second material for conducting electricity. The price of the first material may be higher than that of the second material, but some properties of the first material are better than those of the second material, such as the fatigue resistance, high temperature resistance, and tensile strength of the first material are better than those of the second material, and the resistivity of the first material is less than that of the second material. The present disclosure aims to reduce the manufacturing cost of the stator assembly by using cheaper but inferior materials, but replacing all of them with materials with inferior performance will make the performance of the stator assembly not guaranteed or require increasing the volume of the stator assembly. Therefore, the present disclosure adopts a partial replacement scheme, and at least partially uses cheaper materials to reduce the manufacturing cost while ensuring the performance of the stator assembly and not changing the volume of the stator assembly.

[0048] The first material and the second material may refer to single metal materials or alloy materials. For example, the first material may be a copper alloy material or pure copper, and the second material may be an aluminum alloy material or pure aluminum. The first coil may be, for example, an enameled copper wire, and the second coil may be, for example, an enameled aluminum wire, where the enameled copper wire may be made of pure copper or a copper alloy, and the enameled aluminum wire may be made of pure aluminum or an aluminum alloy.

[0049] Specifically, the stator assembly according to the present disclosure connects the first coil group and the second coil group in parallel, for example Figure 3As shown, the stator assembly can also be used in a three-phase circuit. Thus, the number of windings 2 can be set to three, corresponding to the U-phase, V-phase, and W-phase; or the number of windings 2 can be set to two, corresponding to two phases. Among them, the three-phase windings 2 can be, for example, Y-connected. And in each phase of the windings 2, the first coil group and the second coil group are connected in parallel. When the number of winding turns, the rotor, and the rotational speed are determined, the back electromotive force of the motor is determined. Under the condition that the power of the motor remains unchanged, the total current of the motor remains unchanged, and the total torque of the motor remains unchanged. Thus, this parallel structure is beneficial to reducing the total resistance of the motor windings, thereby reducing the total heat generation of the motor.

[0050] In particular, the winding 2 of the present disclosure is preferably wound around the stator core 1 in a concentrated winding manner, with a simple structure and easy to maintain.

[0051] Furthermore, in the present disclosure, the first coil 21 is wound adjacent to the stator teeth 12, and the second coil is wound around the periphery of the first coil 22. For example, as Figure 2 shown, the inner three layers of the coil are the first coil 21, and the outer three layers of the coil are the second coil. The first coil 21 is closer to the stator core 1. Therefore, the magnetic lines of force generated by the first coil 21 are all concentrated and conducted through the stator core 1; the second coil 22 is close to the outside of the stator. Only part of the magnetic lines of force generated by the second coil 22 are conducted through the stator core 1, and there are also some magnetic lines of force that are magnetically conducted through the air. And the magnetic conductivity of the stator core 1 is much better than that of the air. The magnetic field generated by the first coil 21 located in the inner layer will act on the rotor better.

[0052] On this basis, the present disclosure further sets the wire diameter of the first coil 21 to be larger than that of the second coil 22. Preferably, on each stator tooth, the number of turns of the first coil 21 is substantially the same as that of the second coil 22. In particular, each first coil 21 is the same, and each second coil 22 is the same. Further, in the present disclosure, the resistivity of the first material selected for the first coil 21 is less than the resistivity of the second material selected for the second coil 22. Therefore, on each stator tooth, the total resistance of the first coil 21 is less than that of the second coil 22. Since the resistance of the first coil 21 on each stator tooth is less than that of the second coil 22, the current flowing through the first coil 21 is greater than that of the second coil 22, and the magnetic field intensity generated by the first coil 21 is greater than that of the second coil 22. Combining with the magnetic conduction advantage closer to the stator core 1, the torque acting on the rotor provided by the first coil 21 is greater than that of the second coil 22, that is, the proportion of the torque acting on the rotor provided by the first coil 21 in the total torque is greater than that of the second coil 22. The total torque of the motor is mainly provided by the inner first coil 21, and the outer second coil 22 supplements part of the torque and assists in providing the back electromotive force. For example, more than 65%, more than 70%, more than 75%, more than 80% of the total torque of the motor is provided by the first coil 21. Thus, this structure provides a greater torque than the structure with the second coil arranged inside and the first coil arranged outside or the structure with the first coil and the second coil wound in a mixed manner. Therefore, it can be realized that when the first coil is replaced by the second coil, the provided torque will not be significantly reduced, but can still meet the requirements.

[0053] Since the first coil 21 provides the main torque of the motor, the first coil 21 itself will receive a greater reaction force. Therefore, in order to prevent short circuits or open circuits caused by breakage or damage of the first coil 21, the first material selected for the first coil 21 preferably has better mechanical properties (at least better than the second material), in particular, fatigue resistance and tensile properties, so that the first coil 21 can withstand a greater reaction force and is beneficial to providing a greater proportion of the total torque. On the contrary, since the second coil 22 provides less torque, the second material can receive less reaction force, and the selection requirements for the second material can be relaxed, and a material with weaker mechanical properties but lower price can be selected to reduce costs.

[0054] Furthermore, since the current flowing through the first coil 21 is greater than that through the second coil 22, and the heat generation is proportional to the square of the current, the influence of the current on the generated heat is greater than that of the resistance. More heat will be generated in the first coil 21, and less heat will be generated in the second coil 22. Since the first coil 21 is located in the inner circle and it is more difficult for the heat to dissipate, the heat resistance performance of the first material selected for the first coil 21 needs to be better. On the contrary, since the second coil 22 not only generates less heat, but also is located in the outer circle and is more conducive to heat dissipation, the requirement for the heat resistance of the second material selected for the second coil 22 can be relaxed, and a cheaper material can be selected without burning out the motor.

[0055] Furthermore, according to the stator assembly of the present disclosure, the selection of the wire diameter and the number of turns influence each other, and the wire diameter can be adjusted according to the motor performance. Under the condition that other conditions remain unchanged in the present disclosure, by selecting different wire diameters, the motor performance can be optimized. Considering the unchanged spacing of the motor wire slots, the thicker the wire diameters of the first coil 21 and the second coil 22, the smaller the total resistance after parallel connection, the less heat is generated, and the better the performance. However, when the wire diameters of the first coil 21 and the second coil 22 increase, the number of turns will decrease, the back electromotive force will decrease, the total current will increase, the heat generation will increase, and the motor performance will deteriorate. Therefore, the selection of the wire diameters of the first coil and the second coil is the result of comprehensive consideration and cannot only consider a single factor. Therefore, on the premise of considering the slot fill factor and ensuring that the number of turns is sufficient, the thicker the wire diameters of the first coil and the second coil, the better.

[0056] Therefore, according to the comprehensive consideration result, for the stator assembly of the present disclosure, the wire diameter of the first coil 21 of the present disclosure is preferably between 1.1 times and 1.4 times that of the second coil 22, and preferably 1.2 times that of the second coil 22. On each stator tooth, the number of turns of the second coil 22 can be 0.8 - 1.2 times that of the first coil 21. Preferably, on each stator tooth, the number of turns of the second coil 22 is equal to that of the first coil 21. In particular, on each stator tooth, the total resistance of the first coil 21 is 0.3 - 0.5 times that of the second coil 22, and preferably 0.4 times. In particular, each first coil 21 is the same, and each second coil 22 is the same.

[0057] Furthermore, for a stator assembly having both a first coil 21 and a second coil 22, since power needs to be supplied to the first coil 21 and the second coil 22, the first winding 211 (e.g., enameled copper wire) of the first coil 21 and the second winding 221 (e.g., enameled aluminum wire) of the second coil 22 need to be connected to a terminal. In the existing technology, the first winding 211 and the second winding 221 are usually connected to the same terminal, but this wiring method places higher requirements on the automated welding of the terminal. Especially since there are two types of windings, the first winding 211 and the second winding 221, on the terminal, the welding conditions are more stringent. If the welding is not well controlled, not only will the wire break or there be poor contact, but if the welding causes the first winding 211 and the second winding 221 at the terminal to be exposed to the air, it will also oxidize the first winding 211 and / or the second winding 221, and electrochemical corrosion will occur between the first winding 211 and the second winding 221. For example, the second winding 221 (if the first winding is enameled copper wire and the second winding is enameled aluminum wire) will overheat or break, ultimately resulting in a reduction in motor efficiency or a decrease in the service life of the motor.

[0058] In response, a wiring structure is proposed according to the present disclosure. Specifically, different first terminals 41 and second terminals 42 are provided, the first winding 211 of the first coil 21 is electrically connected to the first terminal 41, and the second winding 221 of the second coil 22 is electrically connected to the second terminal 42, especially through welding to achieve the electrical connection. Figure 6 It is shown that the first winding 211 is welded to the first terminal 41, and the second winding 221 of the second coil 22 can be welded to the second terminal 42 in the same manner. For example, the first terminal 41 and the second terminal 42 can also be nickel-plated or tin-plated at the welding site.

[0059] Thus, by welding the first winding 211 and the second winding 221 at two different terminals respectively, problems such as electrochemical corrosion and different temperature resistance properties of the two enameled wires are solved, the welding requirements are reduced, which is beneficial to improving the welding quality, applicable to large-scale industrial automated production, and has great practical value.

[0060] Furthermore, the first terminals 41 and the second terminals 41 corresponding to the number of winding phases can be respectively set. For example, when there is a three-phase winding, three first terminals 41 and three second terminals 42 can be respectively set; or when there is a two-phase winding, two first terminals 41 and two second terminals 42 can be respectively set. As Figure 9 shown, the first terminals 41 and the second terminals 42 can be alternately and spacedly arranged. Terminal slots can be reserved on the stator skeleton 3 for the terminals to be inserted therein for positioning. Especially, each terminal is arranged at a stator tooth, and six terminals are arranged at six adjacent stator teeth, which is beneficial for subsequent plastic encapsulation steps.

[0061] The first terminal 41 and the second terminal 42 can be exactly the same. The first terminal 41 and the second terminal 42 can include a wire groove for accommodating the winding. The width of the wire groove is greater than the wire diameter of the first winding 211 of the first coil 21 and the wire diameter of the second winding 221 of the second coil 22, and less than twice the wire diameter of the first winding 211 of the first coil 21 and twice the wire diameter of the second winding 221 of the second coil 22. This enables the windings in the wire groove to be arranged in a single row, which is beneficial to improving the welding quality.

[0062] The first winding 211 of the first coil group of the three-phase winding 2 can be electrically connected to one of the three first terminals 41, and the second winding 221 of the second coil group of the three-phase winding 2 can be electrically connected to one of the three second terminals 41, thereby making the three-phase winding 2 independent of each other. The first terminal 41 and the second terminal 42 are electrically connected in pairs. For example, as Figure 7 shown, the first terminal 41 and the second terminal 42 are electrically connected through a connecting member 43 (such as a wire) so that the first coil group and the second coil group in each phase winding 2 are in parallel.

[0063] Furthermore, in order to protect the electrical connection parts and the coils, the stator assembly further includes a plastic encapsulation part 5. For example, after welding, the entire stator assembly is plastic encapsulated with BMC material, especially covering the electrical connection parts (such as the welding parts) between the first terminal 41 and the second terminal 42 and the first winding 211 of the first coil group and the second winding 221 of the second coil group, as well as covering the first coil 21 and the second coil 22. For example, Figure 8 Fig. shows a cross-sectional schematic view of the plastic encapsulation part surrounding other components according to the present disclosure taken at the first terminal 41, and the situation at the second terminal 42 can be inferred by analogy. Thus, air is isolated, preventing the coils from oxidizing, preventing electrochemical reactions between the first winding and the second winding (such as copper wire and aluminum wire), reducing corrosion. In addition, physical protection can also be provided to further fix the first coil and the second coil, reducing the vibration of the coils during the operation of the motor.

[0064] As Figure 8 and 9 shown, the free ends of the first terminal 41 and the second terminal 42 are exposed outside the plastic encapsulation part 5 for subsequent wiring operations.

[0065] The stator assembly may further include a cap (not shown), which is used to fix the terminals. For example, one cap fixes multiple terminals. After the terminals are welded, BMC injection molding is carried out to cover the lower half of the coils and the terminals, isolating them from the air. When injecting, the stator end where the terminals are located bears a great pressure. Without the protection of the cap, the terminals may be squeezed crooked during the injection process, resulting in the upper half of the terminals being also covered in the BMC, making it impossible to carry out subsequent wiring operations.

[0066] The present disclosure also provides a motor, which includes the above stator assembly.

[0067] Through actual experimental tests on a fully copper-wound motor and the motor according to the present disclosure (such as a copper-aluminum wire-wound motor), when the torque is the same, the difference in efficiency between the two motors is between 0.58% and 1.05%.

[0068] The test conditions are as follows:

[0069] Stator outer diameter Stator stack thickness Rotor outer diameter Rotor stack thickness Winding specification Copper wire motor φ260 L105 φ194 L120 Copper: φ0.83 * 84 * 4 The motor of the present disclosure φ260 L105 φ194 L120 Copper: φ0.9 * 42 * 2 Aluminum: φ0.75 * 42 * 2

[0070] From Figure 4 and Figure 5 it can be seen that at the same torque, the efficiency of the copper wire motor is better than that of the motor according to the present disclosure, and the difference in efficiency between the two is between 0.07% and 1.08%. Among them, the efficiency difference is the largest at 100 N·m, which is 1.08%; the efficiency difference is the smallest at 30 N·m, which is 0.07%.

[0071] Under the test conditions of this patent, for a φ260 motor with a full-load output power of 15 kW, the corresponding torque is 95.5 N·m. From Figure 5 it can be seen that between 10 N·m and 80 N·m, the difference in efficiency between the copper wire motor and the motor according to the present disclosure is basically controlled within 0.7%, and the difference in efficiency between the two only starts to increase significantly when approaching the full-load output power. Referring to the energy efficiency grade of GB 30253-2013 variable-frequency drive permanent magnet synchronous motors, the motor according to the present disclosure meets the first-level energy efficiency standard between 20 N·m and 80 N·m, that is, between 3.1 kW and 12.6 kW in power. Generally, motors do not operate at full load all the time. Although the efficiency of the motor according to the present disclosure is less than that of the copper wire motor, the motor according to the present disclosure can meet the first-level energy efficiency within a quite wide power output range, and by replacing half of the expensive first material (such as copper) with the second material (such as aluminum), the cost will be greatly reduced without changing the service life and the stator volume.

[0072] It should be understood that the above description is intended to illustrate rather than limit. For example, the above embodiments (and / or their aspects) can be used in combination with each other. Additionally, many modifications can be made to adapt a particular situation or material to the teachings of the present disclosure without departing from the scope of the present disclosure. The functions or performances of the various elements or modules described herein are for illustrative purposes only and are in no way restrictive, but are merely exemplary embodiments. After reading the above description, many other embodiments and modifications within the spirit and scope of the claims will be apparent to those skilled in the art. Therefore, the scope of the present disclosure should be determined with reference to the appended claims and the full scope of the equivalents given by these claims.

[0073] In the following claims, the terms "comprising" and "wherein" are used as the plain-English equivalents of the respective terms "including" and "in which". In addition, in the following claims, the terms "first", "second", "third", etc. are used merely as labels and are not intended to impose numerical requirements on their objects.

Claims

1. A stator assembly, characterized in that: include a stator core including an annular stator yoke and a plurality of stator teeth connected to a radial inner side of the stator yoke, the plurality of stator teeth being spaced apart from each other in a circumferential direction, windings, each phase winding comprises a first coil group and a second coil group, the first coil group comprises at least one first coil, the second coil group comprises at least one second coil, each of the stator teeth is wound with one of the first coils and one of the second coils, and the first coil of the first coil group and the second coil of the second coil group of each phase winding are wound on the same stator tooth, first terminals, the first coil groups of each phase winding are electrically connected to one of the first terminals respectively, second terminals, the second coil groups of each phase winding are electrically connected to one of the second terminals respectively, The first terminals and the second terminals are electrically connected in pairs so that the first coil group and the second coil group in each phase winding are connected in parallel.

2. The stator assembly according to claim 1, characterized in that The first coil group includes a plurality of first coils connected in series, and the second coil group includes a plurality of second coils connected in series.

3. The stator assembly according to claim 1, characterized in that: The first coil and the second coil are wound with wires of different materials.

4. The stator assembly according to claim 3, characterized in that: The first coil is wound with copper wire, and the second coil is wound with aluminum wire.

5. The stator assembly according to claim 4, characterized in that: Each first coil is wound around a corresponding stator tooth, and each second coil is wound around the outer periphery of the corresponding first coil.

6. The stator assembly according to claim 1, characterized in that The winding wire of each first coil group is welded to a corresponding first terminal, and the winding wire of each second coil group is welded to a corresponding second terminal.

7. The stator assembly according to claim 6, characterized in that: The windings are arranged in the manner of concentrated windings.

8. The stator assembly according to claim 7, characterized in that The connection type of the winding is Y-type connection.

9. The stator assembly according to any one of claims 1 to 8, characterized in that: The stator assembly also includes a plastic packaging part, which surrounds each phase winding and also surrounds the electrical connections between the first terminal and the second terminal and the first coil group and the second coil group respectively, and the free ends of the first terminal and the second terminal are exposed outside the plastic packaging part.

10. A motor, characterized in that: include A stator assembly according to any one of claims 1 to 9.

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