Multi-element stator winding, stator assembly and multi-element motor

Abstract

The utility model relates to the technical field of motors, in particular to a multi-element stator winding, a stator assembly and a multi-element motor, and aims to solve the problem that a conventional motor cannot be suitable for a use scene with a large power span. The multi-element stator winding provided by the utility model comprises a stator iron core and a multi-element winding, wherein the multi-element winding is sleeved on the stator iron core; the multi-element winding comprises at least two coil windings, the coil windings are sleeved on the stator iron core, and the coil windings are not conducted. According to the multi-element stator winding provided by the utility model, one coil winding of a common motor is replaced by a plurality of coil windings which operate independently, so that the rated power of the motor is flexible and variable and has a larger range, and meanwhile, the rated power of the motor can be changed along with the load of the motor so as to ensure that the motor operates in a high-efficiency interval; the problems of low operation efficiency and poor economical efficiency due to the fact that a large horse pulls a trolley are solved, and high efficiency and energy conservation of the motor are achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of motors, in particular to a multi-element stator winding, a stator assembly and a multi-element motor. Background Art

[0002] Existing motors adopt single-coil series or parallel structures, single-stator structures, and the structures of the stator and rotor result in their operating efficiency curves being "parabolic", that is, the highest operating efficiency is only within a "point" range. The efficiency curve will only show an "efficient point" when the motor load rate must operate at the rated power. That is, when the motor is under low load or overloaded, the efficiency is very low, consuming a lot of electricity and having little output. As the load increases, the efficiency value moves upward on the curve. When the load rate reaches 100% (rated load), the efficiency value reaches the highest point on the curve, that is, the vertex of the "parabola". If the operating power load of the motor is higher or lower than this rated "point", the operating efficiency of the motor will decrease sharply, that is, it is particularly power-consuming and the output power decreases. It cannot ensure that the motor always operates in the high-efficiency area, that is, the most energy-saving state, under the scenario requirements where the motor load power changes greatly. Due to the low overload capacity of the motor, when configuring a motor for production equipment, it is configured according to the maximum demand load of the production equipment multiplied by a power redundancy coefficient of 1.2. When the motor operates at a relatively low load rate for most of the year according to production requirements, the configured high-power motor will cause the phenomenon of using a big horse to pull a small cart and reduced efficiency, resulting in a great waste of power and electric energy. Especially when the high-power load of the motor occasionally appears, the economy is extremely poor. Summary of the Utility Model

[0003] The purpose of the utility model is to provide a multi-element stator winding, a stator assembly and a multi-element motor to solve the problems of small applicable power range, low operating efficiency and poor economy of existing motors.

[0004] To solve the above technical problems, the technical solution provided by the utility model is as follows:

[0005] A multi-element stator winding includes a stator core and a multi-element winding, and the multi-element winding is sleeved on the stator core;

[0006] The multi-element winding includes at least two coil windings, the coil windings are sleeved on the stator core, and the coil windings are not electrically connected.

[0007] Further, a plurality of the coil windings are arranged along the length direction of the stator core.

[0008] Further, a plurality of the coil windings are arranged in a multi-threaded structure or the coil windings do not intersect with each other.

[0009] Further, a plurality of the coil windings are sleeved layer by layer in a direction perpendicular to the length direction of the stator core.

[0010] Further, the coil winding is wound with a wire having a circular or rectangular cross-section and pressed into a rectangular cross-section.

[0011] On the other hand, the present invention provides a stator assembly, including the above-mentioned multi-element stator winding;

[0012] Group the coil windings of the multi-element stator winding, and take one coil winding from each multi-element stator winding to form a motor unit. The coil windings in the motor unit are evenly distributed around the axis of the motor output shaft;

[0013] Each of the motor units operates independently.

[0014] Further, the coil windings in each motor unit have the same structure.

[0015] Further, the output powers of the respective motor units are the same or different.

[0016] Further, along the length direction of the stator core, the output powers of the respective motor units increase or decrease in sequence.

[0017] On the third aspect of the present invention, a multi-element motor is provided, including the above-mentioned stator assembly.

[0018] Integrating the above technical solutions, the technical effects that the present invention can achieve are as follows:

[0019] The multi-element stator winding provided by the present invention includes a stator core and a multi-element winding. The multi-element winding is sleeved on the stator core; the multi-element winding includes at least two coil windings. The coil windings are sleeved on the stator core and are not electrically connected to each other.

[0020] By replacing the original single coil winding of a common motor with a plurality of completely independently operating coil windings, the multi-element stator winding provided by the present invention realizes flexible control of the output power of the motor, so that the rated power of the motor is flexible and variable, has a larger adjustment range, and has higher operating efficiency. When the motor is applied to a small-power output scenario, only one coil winding is energized; when the required power output increases, more coil windings are enabled to increase the output power, so that the motor can be applied to usage scenarios with a large power span, avoiding the situation of low motor operating efficiency and huge waste of electric energy caused by using a large motor to drive a small load. At the same time, by controlling the number of enabled coil windings, the current rated power of the motor is made close to the motor load rate, so that the operating efficiency curve of the motor is an approximate "horizontal straight line", that is, it operates in a high-efficiency interval, thereby achieving high efficiency and energy saving. Brief Description of the Drawings

[0021] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0022] Figure 1 Structural schematic diagram of the multi-element stator winding provided by an embodiment of the present invention;

[0023] Figure 2 Structural schematic diagram of the coil winding;

[0024] Figure 3 Schematic diagram of the stator core;

[0025] Figure 4 Structural schematic diagram of the stator assembly;

[0026] Figure 5 Front view of the stator assembly;

[0027] Figure 6 For Figure 5 A-A sectional view in

[0028] Figure 7 For Figure 6 Partial enlarged view at B in

[0029] Figure 8 Top view of the stator assembly;

[0030] Figure 9 For Figure 8 C-C sectional view in

[0031] Figure 10 Structural schematic diagram of the first positioning plate;

[0032] Figure 11 For Figure 10 Enlarged view at D in

[0033] Figure 12 Structural schematic diagram of the motor housing;

[0034] Figure 13 Structural schematic diagram of the inner connecting sleeve;

[0035] Figure 14 Cross-sectional view of the inner connecting sleeve.

[0036] Icon: 100 - Multi - element stator winding; 200 - Stator housing; 300 - First potting layer; 400 - Second potting layer; 110 - Stator core; 120 - Multi - element winding; 121 - Coil winding; 210 - First positioning plate; 220 - Second positioning plate; 230 - Inner connecting sleeve; 240 - Motor housing; 211 - Limit groove; 231 - First annular boss; 241 - Second annular boss; 201 - Outer circulation channel; 202 - Inner circulation channel; 203 - Radial channel; 204 - Injection port. Detailed implementation manners

[0037] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model. Usually, the components of the embodiments of the present utility model described and illustrated herein can be arranged and designed in various different configurations.

[0038] Therefore, the following detailed description of the embodiments of the present utility model provided in the drawings is not intended to limit the scope of the claimed present utility model, but merely represents selected embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts fall within the scope of protection of the present utility model.

[0039] The following will describe in detail some implementation manners of the present utility model with reference to the accompanying drawings. Without conflict, the following embodiments and the features in the embodiments can be combined with each other.

[0040] The operating efficiency curve of existing motors is a "parabola". Only when the motor load rate operates at the rated power, the "high - efficiency point" will appear on the efficiency curve. When the motor runs at a relatively low power for most of the year according to production requirements, configuring a high - power motor will cause the phenomenon of using a big horse to draw a small cart and reduced efficiency, resulting in a great waste of power and electric energy. Especially when the high - power load of the motor occasionally appears, the economy is extremely poor and the electric energy waste is serious.

[0041] In view of this, the present utility model provides a multi - element stator winding, including a stator core 110 and a multi - element winding 120. The multi - element winding 120 is sleeved on the stator core; the multi - element winding 120 includes at least two coil windings 121. The coil windings 121 are sleeved on the stator core 110 and are not electrically connected to each other.

[0042] The multi - element stator winding provided by the present utility model realizes flexible control of the output power of the motor by replacing the original single - coil winding of a common motor with multiple completely independently operating coil windings 121. As a result, the rated power of the motor is flexible and variable, with a larger adjustment range and higher operating efficiency. When the motor is applied to a low - power output scenario, only one coil winding 121 is energized; when the required power output increases, more coil windings 121 are enabled to increase the output power, so that the motor can be suitable for usage scenarios with a large power span, avoiding the situation of low motor operating efficiency and huge waste of electric energy caused by using a large - capacity motor for a small - load. At the same time, by controlling the number of enabled coil windings 121, the current rated power of the motor is made close to the motor load rate, so that the operating efficiency curve of the motor is approximately a "horizontal straight line", that is, it operates in a high - efficiency range, thus achieving high - efficiency energy conservation.

[0043] The following combines Figures 1 - 3 to detail the structure and shape of the multi - element stator winding provided in this embodiment:

[0044] In this embodiment, the coil winding 121 is wound along the cross - sectional shape of the stator core 110, and its shape is approximately fan - shaped, as Figure 2 、 Figure 3 shown. In this embodiment, the coil winding 121 can be wound in multiple turns to increase the output power of a single coil.

[0045] In an alternative solution of this embodiment, multiple coil windings 121 can be arranged along their own axis directions, as Figure 1 shown, that is, arranged along the length direction of the stator core 110. Optionally, they can also be sleeved layer by layer in a direction perpendicular to the length direction of the stator core 110, that is, multiple coil windings 121 are named as the first winding, the second winding, the third winding in sequence. The first winding is sleeved on the stator core 110, the second winding is sleeved on the first winding, the third winding is sleeved on the second winding, and so on. At this time, limited by the internal space, the coil winding 121 is arranged in a single - turn winding manner to facilitate the arrangement of multiple coil windings 121. At the same time, the lengths of all coil windings 121 are equal.

[0046] In an alternative solution of this embodiment, multiple coil windings 121 are arranged in a multi - thread screw structure to improve the uniformity of winding of each coil winding 121, so that it is evenly wound along the length direction of the stator core 110, rather than only wound on a part of the stator core 110, thereby ensuring the uniformity of the magnetic field and further ensuring the balance and stability of the stress state.

[0047] In an alternative solution of this embodiment, each coil winding 121 does not overlap with each other to ensure uniformity, that is, when the coil windings 121 are arranged one by one as Figure 1 shown, there is no overlapping part between adjacent coil windings 121.

[0048] In this embodiment, the coil winding 121 is wound with a wire having a rectangular cross-section to increase the coil full-slot rate and improve the motor output power.

[0049] In an alternative embodiment of the present invention, the coil winding 121 is wound with a wire having a circular or rectangular cross-section and is flattened into a rectangular cross-section by pressing, thereby further increasing the winding tightness to increase the full-slot rate and reduce the resistance and eddy current loss.

[0050] The multi-element stator winding provided in this embodiment replaces one coil winding of a conventional motor with a plurality of coil windings 121 that operate completely independently. As the number of started coil windings 121 increases, the rated power of the motor increases. That is, after the started coil winding 121 brings the motor into the high-efficiency region, a new coil winding 121 is started, so that the motor load rate is always near the current rated power of the motor, so that the motor always operates near the "high-efficiency point", changing the efficiency operation curve from a "parabola" to an approximate "horizontal straight line", ensuring the high efficiency and energy saving of the motor, and avoiding great waste of electric energy caused by the motor operating away from the "high-efficiency point" of the efficiency curve.

[0051] Based on the multi-element stator winding provided in this embodiment, a stator assembly is proposed, which includes the above-mentioned multi-element stator winding 100. The coil windings 121 of the multi-element stator winding 100 are grouped, and one coil winding 121 is taken from each multi-element stator winding 100 to form a motor unit. The coil windings 121 in the motor unit are evenly distributed around the axis of the motor output shaft, and each motor unit operates independently.

[0052] In this embodiment, the coil windings 121 in each motor unit have the same structure, and the coil windings 121 are in the same position along the axis of the motor output shaft.

[0053] In this embodiment, the output powers of the respective motor units are the same or different.

[0054] In this embodiment, along the length direction of the stator core 110, the output powers of the respective motor units increase or decrease in sequence, so as to realize rapid adjustment of the total power of the motor, increase the power levels, and have more output power than when the powers of the respective motor units are equal.

[0055] The stator assembly provided in this embodiment further includes a stator housing 200, a first potting layer 300, and a second potting layer 400. A plurality of multi-element stator windings 100 are arranged in a circular array within the stator housing 200, and both the first potting layer 300 and the second potting layer 400 are provided within the stator housing 200.

[0056] The following Figures 4 - 14 will be a detailed description of the structure and shape of the stator assembly provided in this embodiment:

[0057] In this embodiment, the stator housing 200 includes a first positioning plate 210, a second positioning plate 220, an inner connecting sleeve 230, and a motor housing 240. As shown in Figure 4 、 Figure 9 and Figure 10 、 Figure 11 shown, the inner connecting sleeve 230 is inserted into the motor housing 240 and is coaxially arranged with the motor housing 240. The first positioning plate 210 and the second positioning plate 220 are respectively connected to the inner connecting sleeve 230, and the first positioning plate 210 and the second positioning plate 220 respectively abut against the multi - stator winding 100. Wherein, a limiting groove 211 is provided on one side of the first positioning plate 210 and the second positioning plate 220 that face each other, as shown in

[0058] shown; the upper and lower ends of the stator core 110 are respectively clamped in the limiting grooves 211 of the first positioning plate 210 and the second positioning plate 220 to realize the position locking of the multi - stator winding 100 in the stator housing 200. Thus, there is no need to use a positioning frame for limiting, the gap between adjacent multi - stator windings 100 is reduced, the slot - filling factor is improved, and at the same time, the induced current loss and eddy current loss generated by the positioning frame are avoided, improving the motor efficiency. In this embodiment, the first positioning plate 210 and the second positioning plate 220 have the same structure.

[0059] In an alternative solution of this embodiment, the stator core 110 is inserted into the limiting groove 211 for positioning. Taking three adjacent multi - stator windings 100 as a winding unit, the three coil windings 121 belonging to the same motor unit in the three multi - stator windings 100 are connected in parallel or in series, but cannot be used in a mixed way of series and parallel; the coil windings 121 that do not belong to the same motor unit are in a parallel relationship; multiple winding units are annularly arranged in the stator housing 200. Figure 11 shown, circular grooves are provided at the four corners of the limiting groove 211, and the circular grooves communicate with the limiting groove 211. As shown in

[0060] After assembly, the four corners of the end of the stator core 110 are snapped into the circular grooves to avoid increasing the repair work due to dimensional errors. Figure 12 Specifically, a second annular boss 241 is provided on the inner wall of the motor housing 240, as shown in Figure 9 shown; one side of the second positioning plate 220 abuts against the second annular boss 241, and the other side abuts against the stator core 110; one side of the first positioning plate 210 abuts against the end of the stator core 110 far from the second positioning plate 220, as shown in

[0061] ​​To ensure the coaxiality of the first positioning plate 210 and the second positioning plate 220 and perform limiting, first annular bosses 231 are provided at both ends of the inner connecting sleeve 230. As Figure 14 shown, the first positioning plate 210 and the second positioning plate 220 are respectively sleeved on the first annular bosses 231 at both sections.

[0062] In this embodiment, the limiting groove 211 is machined by a numerical control precision engraving machine to improve its accuracy and flatness, thereby ensuring the precise positioning and reliable limiting of the multi-element stator winding 100, ensuring the smoothness of the radial flow channel 203, and enhancing the reliability and structural strength of the motor.

[0063] To improve the flatness of the limiting groove 211, eliminate the tool marks caused by factors such as vibration in machining that lead to a decrease in flatness, and thus avoid situations such as the multi-element stator winding 100 tilting, shifting in position, and unreliable fixation, ensuring the efficient and stable operation of the motor. In an alternative solution of this embodiment, a film coating layer is further provided on the surface of the first positioning plate 210 and the second positioning plate 220 where the limiting groove 211 is located. Specifically, a film is coated on the first positioning plate 210 and the second positioning plate 220 by means of pressure bonding to improve the flatness and roughness of the surface of the limiting groove 211, thereby improving the positioning accuracy of the multi-element stator winding 100. When coating the film, an adhesive is applied on the surface of the film layer, and then the film and the cover plate are compounded under certain temperature and pressure to form a film coating layer. In this embodiment, both the upper and lower ends of the stator core 110 are abutted against the film coating layer. At this time, a good seal is formed between the two ends of the stator core 110 and the film coating layer, which can prevent the coolant from leaking out from the ends of the stator core 110.

[0064] The film coating layer in this embodiment is non-magnetic, non-conductive, insulating, high-strength, with uniform thickness and extremely thin thickness. Specifically, a polyester film can be selected for film coating, or a film supported by epoxy resin and multiple layers of fibers can also be selected. Specifically, it can be formed by sequentially laminating an epoxy resin layer and a fiber grid layer. An epoxy resin layer is sprayed on the substrate to obtain the epoxy resin layer, and then the fiber grid layer is laid on the surface of the epoxy resin layer. The epoxy resin layer and the fiber grid layer are alternately arranged to obtain the film coating material.

[0065] In this embodiment, a first glue injection layer 300 and a second glue injection layer 400 are provided to improve the sealing performance of the stator housing 200 and the connection strength of each component, as Figure 9 shown. Specifically, the first glue injection layer 300 is connected to the first positioning plate 210, the second glue injection layer 400 is connected to the second positioning plate 220, and both ends of the stator core 110 respectively pass through the first glue injection layer 300 and the second glue injection layer 400 and then abut against the film coating layer.

[0066] In this embodiment, an outer circulation channel 201 is formed by the motor housing 240, the first glue injection layer 300, the second glue injection layer 400 and the multi-stator winding 100; an inner circulation channel 202 is formed by the inner connecting sleeve 230, the first glue injection layer 300, the second glue injection layer 400 and the multi-stator winding 100; a radial flow channel 203 is formed by adjacent multi-stator windings 100, the first glue injection layer 300 and the second glue injection layer 400, as Figure 7 , Figure 9 shown. Specifically, the stator core 110 has a fan-shaped or trapezoidal structure, as Figure 3 shown; the radial flow channel 203 extends radially along the motor housing 240 to connect the outer circulation channel 201 and the inner circulation channel 202 and forms a cooling circulation channel with the outer circulation channel 201 and the inner circulation channel 202.

[0067] The radial flow channel 203 formed between adjacent multi-stator windings 100 avoids the risk of short circuit between the multi-stator windings 100 and improves the reliability and safety of the motor.

[0068] In this embodiment, the first glue injection layer 300 and the second glue injection layer 400 are made of a glue with high temperature resistance, oil resistance, water resistance, extremely strong adhesion and good thermal conductivity. Specifically, epoxy resin glue can be selected. During assembly, first assemble the stator housing 200 and the multi-stator winding 100. The upper and lower ends of each stator core 110 are respectively clamped in the limiting grooves 211 opposite to the first positioning plate 210 and the second positioning plate 220, and the inner connecting sleeve 230 is placed at the central position of the first positioning plate 210 and the second positioning plate 220; then place the stator housing 200 absolutely horizontally, with the axes of the inner connecting sleeve 230 and the motor housing 240 vertical, and then inject a certain height of glue into the stator housing 200. After the glue cools and solidifies, turn the stator housing 200 over and continue to inject a certain height of glue, so as to form the first glue injection layer 300 on the first positioning plate 210 and the second glue injection layer 400 on the second positioning plate 220. The first glue injection layer 300 and the second glue injection layer 400 eliminate the gaps between the first positioning plate 210 and the second positioning plate 220 and the inner connecting sleeve 230 and the motor housing 240, as well as the gap between the film layer and the multi-stator winding 100, improve the sealing performance and connection strength of the stator housing 200, and also improve the insulation ability. It should be noted that the glue needs to be heated before injection to discharge the air bubbles in the glue to ensure the quality of the first glue injection layer 300 and the second glue injection layer 400.

[0069] Specifically, taking the height of the multi-stator winding 100 as 200 mm as an example, the heights of the first potting layer 300 and the second potting layer 400 can be set to not less than 20 mm at this time to ensure that the strong suction force of the rotor magnet on the stator can be borne; especially for a dual-rotor motor with rotors arranged on both sides of the stator assembly, when the two air gaps are off-center, a strong axial tension will be generated. The heights of the first potting layer 300 and the second potting layer 400 not less than 20 mm can ensure the bearing of this tension and avoid damage. At this time, the maximum height of the cooling circulation channel is 60 mm. This height can not only ensure the sealing performance and connection strength, but also ensure the full contact between the coolant and the multi-stator winding 100, ensuring the cooling effect.

[0070] In this embodiment, injection ports 204 are provided on the motor housing 240. The two injection ports 204 are evenly distributed around the axis of the motor housing 240 and communicate with the outer circulation channel 201, as Figure 9 、 Figure 12 shown. The two injection ports 204 serve as the oil inlet and the oil outlet respectively, and can also serve as auxiliary injection ports during potting.

[0071] In this embodiment, the first positioning plate 210, the second positioning plate 220 and the inner connecting sleeve 230 are made of non-magnetic, non-conductive and high-strength materials. Specifically, non-metallic materials such as fiber-reinforced plastics and fiber-reinforced PEEK can be selected to further reduce eddy current losses and induced current losses. Among them, fiber-reinforced plastics can be carbon fiber-reinforced plastics or glass fiber-reinforced plastics; reinforced PEEK can be glass fiber-reinforced PEEK. The motor housing 240 is made of aluminum alloy material or made of cast steel. When using cast steel, a magnetic shielding layer needs to be provided on the inner wall of the motor housing 240. By using the setting of aluminum alloy material or cast steel plus magnetic shielding layer, the harmonics generated during motor operation can be prevented from interfering with other electrical equipment, and the magnetic leakage loss during motor operation can be blocked to achieve lower losses and obtain a higher power saving rate. Specifically, the magnetic shielding layer can be a nanocrystalline magnetic shielding layer or made of materials such as permalloy.

[0072] In this embodiment, the encapsulation parts except the multi-stator winding 100, the motor housing 240, and bolts and washers are made of non-conductive and non-magnetic non-metallic materials such as fiber-reinforced plastics, glass fiber-reinforced plastics, and reinforced PEEK to further reduce eddy current losses and induced current losses.

[0073] The working process of the stator assembly provided in this embodiment is as follows:

[0074] During operation, three adjacent winding units are connected to three-phase current to achieve pole conversion. The lower injection port 204 serves as the oil inlet, and the upper injection port 204 serves as the oil outlet for the coolant to flow in and out, so as to ensure sufficient contact between the coolant and the multi-component stator winding 100. The coolant enters from the oil inlet and flows through the outer circulation channel 201, the inner circulation channel 202, and the radial channel 203 to achieve sufficient cooling of the multi-component stator winding 100 and flows out from the oil outlet. The setting of the radial channel 203 increases the contact area between the coolant and the multi-component stator winding 100, improves the cooling effect, avoids the situation where the temperature in the middle of the multi-component stator winding 100 is too high while the temperatures at both ends close to the inner connection sleeve 230 and the motor housing 240 are relatively low, significantly improves the cooling effect, and further improves the overload capacity of the motor.

[0075] In the stator assembly provided in this embodiment, the setting of the radial channel 203 increases the contact area between the coolant and the multi-component stator winding 100, improves the heat dissipation capacity. At the same time, the radial channel 203 connects the outer circulation channel 201 and the inner circulation channel 202, improves the circulation capacity of the coolant, and further enhances the cooling effect. In addition, the method of installing the multi-component stator winding 100 through the stator housing 200 avoids the occupation of space by setting a positioning frame, reduces the gap between the multi-component stator windings 100, improves the slot fill factor, and avoids the induced current loss, eddy current loss, and short-circuit risk brought by the metal positioning frame, improving the efficiency and safety of the motor.

[0076] Based on the stator assembly provided in this embodiment, a multi-component motor is proposed, which includes the above-mentioned stator assembly and also includes a rotor. Specifically, two rotors are coaxially arranged with the stator assembly and are respectively arranged on both sides of the stator assembly. Due to the cooling capacity and high efficiency and energy saving of the stator assembly in this embodiment, the multi-component motor can have an overload capacity of 150%, ensuring the starting safety and stability of the motor, achieving energy conservation and consumption reduction, and having important economic value for energy conservation and consumption reduction of large equipment.

[0077] Particularly, by using the multi-component stator winding 100, the multi-component motor can group the coil windings 121, that is, one coil winding 121 is taken from each multi-component stator winding 100 to form a group of windings in a circular array, and each group of windings operates independently. In short, by grouping the coil windings 121, the multi-component motor is divided into multiple independently operating motor units. When the multi-component stator winding 100 includes four coil windings 121, which are respectively named the first winding, the second winding, the third winding, and the fourth winding, as Figure 1As shown in the figure, at this time, the multi-unit motor includes a total of four sets of windings, that is, four motor units are formed, named the first motor unit, the second motor unit, the third motor unit, and the fourth motor unit. The first motor unit is the structure of the multi-unit motor excluding the second winding, the third winding, and the fourth winding, and the second motor unit is the structure of the multi-unit motor excluding the first winding, the third winding, and the fourth winding; that is, except for the coil winding 121, all motor units share the stator core 110, the motor output shaft, the rotor, the motor housing, etc.

[0078] In this embodiment, the current rated power of the multi-unit motor is controlled by controlling the number of started motor units. After the already operating motor units enter the high-efficiency region, a new motor unit is started to make the current rated power of the multi-unit motor match the load, and the motor operates in the high-efficiency region. Therefore, the overall efficiency of the multi-unit motor provided in this embodiment is always between 95% and 99%, and there is a very large high-efficiency range, thus achieving a very high power-saving rate. At this time, the motor operating efficiency curve changes from a "parabola" to an approximately "horizontal straight line". Therefore, when the load rate is 5%, the operating efficiency of the multi-unit motor can reach about 95%; while for a general motor, if its operating efficiency is to reach more than 90%, its load rate must reach about 100%, that is, it operates near the rated power. Therefore, in the actual use of a general motor with load fluctuations and when using a frequency converter for speed regulation, its operating efficiency is significantly reduced, resulting in a large power consumption but a small motor output, and it is difficult to achieve the effect that the multi-unit motor provided in this embodiment can adjust the power according to the motor load to ensure high efficiency.

[0079] Even if multiple windings are arranged on the same iron core for the existing ordinary motor stator windings, the windings are all connected in parallel to form a single motor for operation, and the power input lines of the motor are all 6 wires or 3 wires and operate in a single-unit single-control mode.

[0080] The power input line of the multi-unit motor provided in this embodiment is the number of multi-unit motors multiplied by 6 wires. When the multi-unit motor has four motor units, it is equivalent to the multi-unit motor including four ordinary motors. At this time, the power input line is: 4 × 6 wires = 24 wires. In order to achieve more precise control and higher efficiency, the multi-unit motor provided in this embodiment is provided with eight motor units, that is, the multi-winding 120 of each multi-unit stator winding 100 includes eight completely independently operating coil windings 121. At this time, the power input line of the multi-unit motor is 48, as Figure 4 shown.

[0081] The multi - element motor provided in this embodiment realizes flexible control of power by dividing a set of windings of a common motor into multiple sets of completely independent operating windings, that is, enabling different numbers of winding sets can obtain different rated powers, so that the current rated power of the motor matches the motor load and is applicable to usage scenarios with a large power span, solving the problems of low motor operating efficiency and huge waste of electrical energy when the load rate of a common motor deviates from the rated power under different operating conditions. The multi - element motor provided in this embodiment can adjust its own rated power according to the motor load, so that the motor load rate operates under the current rated power, achieving the effect that when the motor load rate fluctuates between 5% and 150%, the motor efficiency is always between 95% and 99%, and achieving the purpose of high - efficiency energy saving.

[0082] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A multi-element stator winding, characterized in that, It includes a stator core (110) and a multi-winding (120), and the multi-winding (120) is sleeved on the stator core (110); The multi-winding (120) includes at least two coil windings (121), the coil windings (121) are sleeved on the stator core (110), and the coil windings (121) are not electrically connected to each other.

2. The multi-stator winding according to claim 1, characterized in that, A plurality of the coil windings (121) are arranged along the length direction of the stator core (110).

3. The multi-phase stator winding according to claim 2, wherein, The plurality of coil windings (121) are arranged in a multi-threaded structure or the coil windings (121) do not intersect each other.

4. The multi-stator winding according to claim 1, wherein The plurality of coil windings (121) are sleeved layer by layer along the direction perpendicular to the length direction of the stator core (110).

5. The multi-phase stator winding according to claim 1, wherein, The coil winding is wound with a wire having a circular or rectangular cross-section and pressed into a rectangular cross-section.

6. A stator assembly, characterized in that, It includes the multi-stator winding (100) according to any one of claims 1-5; Group the coil windings (121) of the multi-stator winding (100), and take one of the coil windings (121) from each multi-stator winding (100) to form a motor unit, and the coil windings (121) in the motor unit are evenly distributed around the axis of the motor output shaft; Each of the motor units operates independently.

7. The stator assembly according to claim 6, wherein, The coil windings (121) in each of the motor units have the same structure.

8. The stator assembly according to claim 6, wherein, The output powers of the respective motor units are the same or different.

9. The stator assembly according to claim 6, wherein, Along the length direction of the stator core (110), the output powers of the respective motor units increase or decrease in sequence.

10. A multi-element motor, characterized in that, It includes the stator assembly according to any one of claims 6-9.

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