A dual-winding generator with shared stator teeth

Abstract

This invention relates to a dual-winding generator with shared stator teeth, wherein the stator and rotor are coaxially mounted. The stator consists of a stator yoke, stator teeth, and stator windings. The stator teeth are located on one side of the stator yoke and are evenly distributed along the circumference. The stator windings are distributed windings and are wound around the stator teeth to form a radial flux structure of the shared stator teeth. The rotor includes N-pole permanent magnets, S-pole permanent magnets, and a rotor core. The N-pole and S-pole permanent magnets are surface-mounted on one side of the rotor core and are evenly distributed along the circumference to form a split permanent magnet structure. The dual-winding generator of this invention has a simple structure and process, and is easy to manufacture. Based on a single rotor, by fully utilizing the spatial harmonic components of the air gap magnetic flux density generated by the splitting of the rotor permanent magnets, the generator achieves dual-port power output, resulting in high integration and improving the power density of the dual-winding generator. Furthermore, a low magnetic field coupling can be achieved between the two sets of windings.

Description

Technical Field

[0001] This invention relates to a dual-winding generator, and more particularly to a dual-winding generator with a common stator tooth. Background Technology

[0002] A dual-winding generator is a typical dual-port output motor, meaning it has two electrical ports on the same generator. Compared to traditional generators, dual-winding generators can simultaneously meet two different electrical load requirements through their dual-port output.

[0003] Existing dual-winding generator schemes can be divided into synchronous generator schemes and asynchronous generator schemes based on their operating principles. Synchronous generator schemes further include permanent magnet schemes and electrically excited schemes. The permanent magnet synchronous generator scheme in related technologies (CN201710673903.X, CN202110426332.6) typically employs a parallel structure and a 15-degree electrical angle phase shift between the two sets of windings to reduce the magnetic field coupling between them. This poses challenges to the motor structure and winding design. The electrically excited synchronous generator scheme in related technologies (CN201710323837.3, CN201711054317.3) requires the excitation winding to generate a static magnetic field and, based on the doubly salient pole principle, induces an electromotive force in the two armature windings. Its structure is more complex and its power density is lower. The asynchronous motor solutions in related technologies (CN201710285294.0, CN202110767400.5) have limited application range because they do not have an independent excitation system. Although the motor structure is simple, it must draw the lagging magnetizing current from the connected power grid. Summary of the Invention

[0004] To overcome the shortcomings of the prior art, the present invention aims to provide a dual-winding generator with shared stator teeth. This generator is not only simple in structure and manufacturing process, but also, based on a single rotor, can fully utilize the spatial harmonic components of the air gap magnetic flux density generated by the splitting of the rotor permanent magnet. This allows for the introduction of electrical output dominated by spatial harmonic components on top of the fundamental frequency-dominated electrical output, thereby achieving electrical output from dual electrical ports of the generator. It has a high degree of integration and is beneficial for improving the power density of the dual-winding generator.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows: a dual-winding generator with shared stator teeth, comprising a stator and a rotor, wherein the stator and rotor are coaxially mounted; the stator is composed of a stator yoke, a stator tooth portion, and a stator winding; the stator tooth portion is disposed on one side of the stator yoke and is evenly distributed along the circumferential direction; the stator winding is a distributed winding and is wound around the stator tooth portion to form a radial flux structure of the shared stator tooth portion; the rotor comprises an N-pole permanent magnet, an S-pole permanent magnet, and a rotor core; the N-pole permanent magnet and the S-pole permanent magnet are attached to one side of the rotor core and are evenly distributed along the circumferential direction to form a split permanent magnet structure.

[0006] Furthermore, the stator winding is divided into four layers, including an upper winding at one electrical port, a lower winding at one electrical port, an upper winding at the other electrical port, and a lower winding at the other electrical port.

[0007] Furthermore, the upper winding and the lower winding of one electrical port are wrapped with an insulation layer for one electrical port winding; the upper winding and the lower winding of the other electrical port are wrapped with an insulation layer for the other electrical port winding.

[0008] Furthermore, there are stator slots between adjacent stator teeth that are evenly distributed along the circumference.

[0009] Furthermore, the N-pole permanent magnet has a split structure with a split number of k, including a left-side N-pole permanent magnet and a right-side N-pole permanent magnet; the S-pole permanent magnet also has a split structure with a split number of k, including a left-side S-pole permanent magnet and a right-side S-pole permanent magnet; where k is a natural number.

[0010] Furthermore, the permanent magnet on the left side of the N pole and the permanent magnet on the right side of the N pole are spaced apart by a certain angle θ. N The permanent magnet on the left side of the S pole and the permanent magnet on the right side of the S pole are spaced apart by a certain angle θ. S , and θ N equal to θ S .

[0011] Furthermore, the number of phases m1 on one side and m2 on the other side of the dual-winding generator are both positive integers; the number of slots Z of the stator s The number of poles Z of the rotor is simultaneously equal to a positive integer multiple of both the number of phases m1 and m2. r It is a positive even number and satisfies:

[0012] Z s / m1 / GCD(Z s Z r ) and Z s / m2 / GCD(Z s Z r×(2k+1)) are all positive integers, where: k is the number of splits, and GCD is the greatest common divisor.

[0013] The beneficial effects of this invention are as follows:

[0014] 1. The radial flux scheme with shared stator teeth is adopted, which simplifies the stator and rotor structure. Furthermore, the rotor permanent magnet adopts a split structure with the surface attached to one side of the rotor core. Therefore, the generator has a simple structure and process, and is easy to manufacture.

[0015] 2. Based on a rotor, by fully utilizing the spatial harmonic components of the air gap magnetic flux density generated by the splitting of the rotor permanent magnet, the electrical output dominated by spatial harmonic components is introduced on the basis of the electrical output dominated by the fundamental wave, thereby realizing the electrical output of the generator with dual electrical ports. It has a high degree of integration and is conducive to improving the power density of the dual-winding generator.

[0016] 3. The two sets of windings operate using magnetic flux density harmonics of different spatial orders. By selecting appropriate slot pole combination schemes, permanent magnet splitting times and winding pitch, a low magnetic field coupling degree between the two sets of windings can be achieved. Attached Figure Description

[0017] Figure 1 This is the overall structure of the dual-winding generator with shared stator teeth according to the present invention;

[0018] Figure 2 This is a partial enlarged view of the stator of the dual-winding generator with shared stator teeth according to the present invention;

[0019] Figure 3 The stator slot number is for one embodiment of the dual-winding generator with shared stator teeth of the present invention.

[0020] Figure 4 This is a winding wiring diagram of an embodiment of the dual-winding generator with shared stator teeth according to the present invention.

[0021] Figure 5 This is a diagram showing the unloaded magnetic field distribution of an embodiment of the dual-winding generator with shared stator teeth according to the present invention.

[0022] Figure 6(a) is an unloaded air gap magnetic flux density distribution diagram of an embodiment of the dual-winding generator with shared stator teeth of the present invention;

[0023] Figure 6(b) is a diagram of the no-load air gap magnetic flux density spatial harmonic content of an embodiment of the dual-winding generator with shared stator teeth of the present invention.

[0024] Figure 7 This is a dual-port output scheme for an embodiment of the dual-winding generator with shared stator teeth of the present invention;

[0025] Figure 8(a) is a full-load three-phase line voltage waveform at the AC output terminal of an embodiment of the dual-winding generator with shared stator teeth of the present invention.

[0026] Figure 8(b) is a full-load DC voltage waveform at the DC output terminal of an embodiment of the dual-winding generator with shared stator teeth of the present invention.

[0027] Explanation of reference numerals in the attached drawings: 1 Stator, 1-1 Stator yoke, 1-2 Stator teeth, 1-3 Stator winding, 1-3-1 Upper winding of one side electrical port, 1-3-2 Lower winding of one side electrical port, 1-3-3 Insulation layer of winding of one side electrical port, 1-3-4 Upper winding of the other side electrical port, 1-3-5 Lower winding of the other side electrical port, 1-3-6 Insulation layer of winding of the other side electrical port, 1-4 Stator slot, 2 Rotor, 2-1 N-pole permanent magnet, 2-1-1 Left N-pole permanent magnet, 2-1-2 Right N-pole permanent magnet, 2-2 S-pole permanent magnet, 2-2-1 Left S-pole permanent magnet, 2-2-2 Right S-pole permanent magnet, 2-3 Rotor core. Detailed Implementation

[0028] The present invention will now be described in further detail with reference to the accompanying drawings. For ease of explanation, the present invention uses a dual-winding generator with one side electrical port phase number m1 = 3, the other side electrical port phase number m2 = 3, and the stator 1 slot number Z. s =36, Number of poles Z of rotor 2 r =2. The case where the number of splits of the permanent magnet k=1 is taken as an embodiment of the present invention.

[0029] This invention provides a dual-winding generator with shared stator teeth, the overall structure of which is as follows: Figure 1 As shown, the dual-winding generator includes a stator 1 and a rotor 2, which are coaxially mounted. The stator 1 consists of a stator yoke 1-1, stator teeth 1-2, and stator windings 1-3. The stator teeth 1-2 are located on one side of the stator yoke 1-1 and are evenly distributed along the circumference. The stator windings 1-3 are distributed windings wound around the stator teeth 1-2. The rotor 2 includes an N-pole permanent magnet 2-1, an S-pole permanent magnet 2-2, and a rotor core 2-3.

[0030] Figure 2This is a partially enlarged view of the stator of a dual-winding generator with shared stator teeth according to the present invention. As can be seen, the stator windings 1-3 are divided into four layers, including an upper winding 1-3-1 at one electrical port, a lower winding 1-3-2 at one electrical port, an upper winding 1-3-4 at the other electrical port, and a lower winding 1-3-5 at the other electrical port. The upper winding 1-3-1 and the lower winding 1-3-2 at one electrical port are enclosed by an insulating layer 1-3-3 for that electrical port. The upper winding 1-3-4 and the lower winding 1-3-5 at the other electrical port are enclosed by an insulating layer 1-3-6 for that electrical port. Furthermore, stator slots 1-4 exist between adjacent stator teeth 1-2 that are evenly distributed along the circumference.

[0031] In addition, by Figure 1 It can be seen that the N-pole permanent magnet 2-1 and the S-pole permanent magnet 2-2 are attached to one side of the rotor core 2-3 and are alternately distributed along the circumference. Furthermore, in... Figure 1 In the illustrated embodiment, the N-pole permanent magnet 2-1 has a split structure with a splitting number k equal to 1, comprising a left-side N-pole permanent magnet 2-1-1 and a right-side N-pole permanent magnet 2-1-2; the S-pole permanent magnet 2-2 also has a split structure with a splitting number k equal to 1, comprising a left-side S-pole permanent magnet 2-2-1 and a right-side S-pole permanent magnet 2-2-2. The left-side N-pole permanent magnet 2-1-1 and the right-side N-pole permanent magnet 2-1-2 are spaced apart by a certain angle θ. N The permanent magnet 2-2-1 on the left side of the S pole and the permanent magnet 2-2-2 on the right side of the S pole are spaced apart by a certain angle θ. S , and θ N equal to θ S .

[0032] Because the dual-winding generator proposed in this invention adopts a radial flux scheme with a shared stator tooth section, the stator and rotor structure is simple. Furthermore, the rotor permanent magnet adopts a split structure with the surface attached to one side of the rotor core. Therefore, the generator has a simple structure and process, and is easy to manufacture.

[0033] Figure 3 and Figure 4 These are the stator slot numbers and winding wiring diagrams for an embodiment of a dual-winding generator with shared stator teeth according to the present invention. It can be seen that the A, B, and C three-phase windings of one electrical port are composed of the upper winding 1-3-1 and the lower winding 1-3-2 of one electrical port, and the U, V, and W three-phase windings of the other electrical port are composed of the upper winding 1-3-4 and the lower winding 1-3-5 of the other electrical port. The A, B, and C three-phase windings of one electrical port have 2 poles, and the U, V, and W three-phase windings of the other electrical port have 6 poles. Furthermore, the A, B, and C three-phase windings and the U, V, and W three-phase windings can be constructed using... Figure 4 The full-pitch winding shown can also be replaced with a short-pitch winding.

[0034] Figure 5 This is an example of the no-load magnetic flux distribution diagram of a dual-winding generator with shared stator teeth according to the present invention. It can be seen that in the embodiment with 36 stator slots and 2 rotor poles, the use of split-structure N-pole permanent magnets 2-1 and S-pole permanent magnets 2-2 results in a significant splitting of the magnetic flux lines at the generator poles, which can also be seen from the no-load air gap magnetic flux density distribution diagram shown in Figure 6(a). Harmonic analysis of the no-load air gap magnetic flux density shown in Figure 6(a) yields the spatial harmonic content diagram of the no-load air gap magnetic flux density shown in Figure 6(b). It can be seen that the split-structure N-pole permanent magnets 2-1 and S-pole permanent magnets 2-2 not only retain the first spatial harmonic in the air gap magnetic flux density but also introduce a higher content of the third spatial harmonic. The original first spatial harmonic and the newly added third spatial harmonic in the air gap magnetic flux density will induce electromotive forces in the 2-pole A, B, C three-phase windings and the 6-pole U, V, W three-phase windings, respectively.

[0035] Therefore, the dual-winding generator proposed in this invention can, on the basis of a single rotor, fully utilize the spatial harmonic components of the air gap magnetic flux density generated by the splitting of the rotor permanent magnet, thereby introducing electrical energy output dominated by spatial harmonic components on the basis of electrical energy output dominated by the fundamental wave, and thus realize electrical energy output at dual electrical ports of the generator. It has a high degree of integration and is conducive to improving the power density of the dual-winding generator.

[0036] The present invention provides an embodiment of a dual-winding generator with shared stator teeth, featuring a dual-port output scheme as follows: Figure 7 As shown. In this embodiment, the A, B, and C three-phase windings of one side of the dual-winding generator are connected to a three-phase load, while the U, V, and W three-phase windings of the other side are rectified to output a DC voltage U. dc For a DC load, taking a rated output of 25kW and a rated line voltage of 380V on one side of the electrical port and a rated output of 5kW and a rated DC voltage of 24V on the other side of the electrical port as an example, the three-phase line voltage waveform and DC voltage waveform under full load are shown in Figure 8(a) and Figure 8(b), respectively.

[0037] To facilitate the explanation of the embodiments of the present invention, the above content uses the following as an example: the number of phases at one electrical port of the dual-winding generator is m1 = 3, the number of phases at the other electrical port is m2 = 3, and the number of slots Z of stator 1 is... s =36, Number of poles Z of rotor 2 r The case of 2 poles is explained as an example of the slot-pole combination scheme. The selection principle for the stator and rotor pole numbers of the dual-winding generator proposed in this invention is explained below. The number of phases m1 on one side and m2 on the other side of the dual-winding generator are both positive integers; the number of slots Z in stator 1...s The number of poles Z of rotor 2 is also equal to a positive integer multiple of both phase numbers m1 and m2. r Z is a positive even number and satisfies: s / m1 / GCD(Z s Z r ) and Z s / m2 / GCD(Z s Z r ×(2k+1)) are all positive integers, where the number of splits k is a natural number and GCD is the greatest common divisor.

[0038] It should be noted that the dual-winding generator proposed in this invention operates using magnetic flux density harmonics of different spatial orders. Furthermore, by selecting appropriate slot pole combination schemes, permanent magnet splitting times, and winding pitch, a low magnetic field coupling degree between the two windings can be achieved. For example, when the number of permanent magnet splits k=1, the three-phase windings at one electrical port and the other electrical port operate using the first and third spatial harmonics of the air gap magnetic flux density, respectively. The third harmonic of the electromotive force induced by the third spatial harmonic of the air gap magnetic flux density in the three-phase winding at one electrical port will be canceled out in the star-connected winding, while the first harmonic of the electromotive force induced by the first spatial harmonic of the air gap magnetic flux density in the three-phase winding at the other electrical port has a smaller impact after rectification. When the number of permanent magnet splits k=2, the three-phase windings at one electrical port and the other electrical port operate using the first and fifth spatial harmonics of the air gap magnetic flux density, respectively. The fifth harmonic of the electromotive force induced by the fifth spatial harmonic of the air gap magnetic flux density in the three-phase winding at one electrical port can be weakened by short-pitch winding, while the first harmonic of the electromotive force induced by the first spatial harmonic of the air gap magnetic flux density in the three-phase winding at the other electrical port has a smaller impact after rectification.

[0039] Therefore, the dual-winding generator proposed in this invention can achieve a low magnetic field coupling degree between the two windings by selecting a suitable slot pole combination scheme, the number of permanent magnet splits and the winding pitch.

[0040] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the invention, such as changes in the number of motor phases, slot-pole combination schemes, winding forms, number of permanent magnet splits, external rotor forms, electrical systems, etc. The scope of the invention is defined by the claims and their equivalents.

Claims

1. A dual-winding generator with shared stator teeth, comprising a stator (1) and a rotor (2), characterized in that: The stator (1) and rotor (2) are coaxially mounted; the stator (1) consists of a stator yoke (1-1), stator teeth (1-2), and stator windings (1-3); the stator teeth (1-2) are located on one side of the stator yoke (1-1) and are evenly distributed along the circumferential direction; the stator windings (1-3) are distributed windings and are wound around the stator teeth (1-2) to form a radial flux structure sharing the stator teeth; the rotor (2) includes an N-pole permanent magnet (2-1), an S-pole permanent magnet (2-2), and a rotor core (2-3); the N-pole permanent magnet (2-1) and the S-pole permanent magnet (2-2) are... 2-2) The permanent magnets are attached to one side of the rotor core (2-3) and evenly distributed along the circumference to form a split structure; the N-pole permanent magnet (2-1) is a split structure with k splits, including the left N-pole permanent magnet (2-1-1) and the right N-pole permanent magnet (2-1-2); the S-pole permanent magnet (2-2) is also a split structure with k splits, including the left S-pole permanent magnet (2-2-1) and the right S-pole permanent magnet (2-2-2); where k is a natural number; the left N-pole permanent magnet (2-1-1) and the right N-pole permanent magnet (2-1-2) are spaced apart by a certain angle θ. N The permanent magnet on the left side of the S pole (2-2-1) and the permanent magnet on the right side of the S pole (2-2-2) are spaced apart by a certain angle θ. S , and θ N equal to θ S The number of phases m1 on one side and m2 on the other side of the dual-winding generator are both positive integers; the number of slots Z of the stator (1) s The number of poles Z of the rotor (2) is equal to a positive integer multiple of both the number of phases m1 and m2. r Z is a positive even number and satisfies: s / m1 / GCD(Z s Z r ) and Z s / m2 / GCD(Z s Z r ×(2k+1)) are all positive integers, where: k is the number of splits, and GCD is the greatest common divisor.

2. The dual-winding generator with shared stator teeth according to claim 1, characterized in that: The stator winding (1-3) is divided into four layers, including an upper winding (1-3-1) at one electrical port, a lower winding (1-3-2) at one electrical port, an upper winding (1-3-4) at the other electrical port, and a lower winding (1-3-5) at the other electrical port.

3. The dual-winding generator with shared stator teeth according to claim 2, characterized in that: The upper winding (1-3-1) and the lower winding (1-3-2) of one electrical port are wrapped with an insulation layer (1-3-3) of one electrical port; the upper winding (1-3-4) and the lower winding (1-3-5) of the other electrical port are wrapped with an insulation layer (1-3-6) of the other electrical port.

4. The dual-winding generator with shared stator teeth according to claim 1, characterized in that: Stator slots (1-4) exist between adjacent stator teeth (1-2) that are evenly distributed along the circumference.

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