A stator split-tooth structure dual-winding generator

Abstract

This invention relates to a dual-winding generator with a split-tooth stator structure, comprising a stator and a rotor, which are coaxially mounted. The stator teeth have a split structure, and the rotor's permanent magnets are surface-mounted on one side of the rotor core, allowing the magnetic field lines at the generator's magnetic poles to split. The dual-winding generator proposed in this invention has a simple structure and manufacturing process, and is easy to process and manufacture. Furthermore, based on a single rotor, it fully utilizes the air gap magnetic flux density space harmonic components generated by the splitting of the rotor's permanent magnets to achieve dual-port power output, resulting in high integration and improved power density. Additionally, it achieves low magnetic field coupling between the two windings.

Description

Technical Field

[0001] This invention relates to a dual-winding generator, and more particularly to a dual-winding generator with a stator split-tooth structure. 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] In order to overcome the shortcomings of the prior art, the present invention aims to provide a stator split tooth structure dual-winding generator, which can, on the basis of a rotor, fully utilize the air gap magnetic flux density space harmonic components generated by the splitting of the rotor permanent magnet, thereby introducing the power output dominated by the space harmonic components on the basis of the power output dominated by the fundamental wave, and thus realize the power output of the generator at two electrical ports. It has a high degree of integration and is conducive to 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 stator split-tooth structure dual-winding generator, comprising a stator and a rotor, wherein the stator and rotor are coaxially mounted; the teeth of the stator are of a split structure, consisting of a stator yoke, an outer stator tooth, an inner stator tooth, an outer stator winding, and an inner stator winding; the permanent magnets of the rotor are of a split structure, consisting of an N-pole permanent magnet, an S-pole permanent magnet, and a rotor core, wherein the N-pole permanent magnet and the S-pole permanent magnet are attached to one side of the rotor core, which enables the magnetic field lines at the generator's magnetic poles to split.

[0006] Furthermore, the outer stator teeth are located outside the inner stator teeth, and are all located on one side of the stator yoke, and are evenly distributed along the circumferential direction.

[0007] Furthermore, both the outer stator winding and the inner stator winding are concentrated windings, and are respectively wound on the outer stator teeth and the inner stator teeth.

[0008] Furthermore, both the outer stator winding and the inner stator winding are double-layer windings; the outer stator winding includes an outer left winding and an outer right winding; the inner stator winding includes an inner left winding and an inner right winding.

[0009] Furthermore, the internal stator teeth include internal left stator teeth, internal middle stator teeth, and internal right stator teeth.

[0010] Furthermore, the number of phases m1 of the external stator winding and the number of phases m2 of the internal stator winding are both positive integers; the number of slots corresponding to the external stator teeth is Z. s1 The number of slots Z corresponding to the internal stator teeth is equal to a positive integer multiple of the phase number m1. s2 Equal to a positive integer multiple of the number of phases m2; the number of poles Z of the rotor r It is a positive even number and satisfies:

[0011] Z s1 / m1 / GCD(Z s1 Z r ) and Z s2 / m2 / GCD(Z s2 Z r ×(2k+1)) are all positive integers, and Z s2 For Z s1 A positive integer multiple of , where the number of splits k is a natural number and GCD is the greatest common divisor.

[0012] Furthermore, the N-pole permanent magnet and the S-pole permanent magnet are alternately distributed and attached to one side of the rotor core along the circumferential direction.

[0013] 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.

[0014] 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 θS .

[0015] The beneficial effects of this invention are as follows:

[0016] 1. The radial flux scheme is adopted, the stator and rotor structure is simple, and the rotor permanent magnet adopts a split structure that is surface-mounted on one side of the rotor core. Therefore, the generator structure and process are simple and easy to manufacture.

[0017] 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.

[0018] 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

[0019] Figure 1 This is the overall structure of the stator split-tooth structure dual-winding generator of the present invention;

[0020] Figure 2 This is a partial enlarged view of the stator of the dual-winding generator with a split-tooth stator structure according to the present invention;

[0021] Figure 3 These are stator slot numbers for one embodiment of the stator split-tooth structure dual-winding generator of the present invention;

[0022] Figure 4 This is a winding wiring diagram of an embodiment of the stator split-tooth structure dual-winding generator of the present invention;

[0023] Figure 5 This is an unloaded magnetic field distribution diagram of an embodiment of the stator split-tooth structure dual-winding generator of the present invention;

[0024] Figure 6(a) is an unloaded air gap magnetic flux density distribution diagram of an embodiment of the stator split tooth structure dual winding generator of the present invention;

[0025] Figure 6(b) is a diagram of the no-load air gap magnetic flux density spatial harmonic content of an embodiment of the stator split tooth structure dual winding generator of the present invention;

[0026] Figure 7 This is a dual-port output scheme for an embodiment of the stator split-tooth structure dual-winding generator of the present invention;

[0027] Figure 8(a) shows the full-load three-phase line voltage waveform at the AC output terminal of an embodiment of the stator split tooth structure dual winding generator of the present invention.

[0028] Figure 8(b) shows the full-load DC voltage waveform at the DC output terminal of an embodiment of the present invention and the stator split tooth structure dual winding generator.

[0029] Explanation of reference numerals in the attached drawings: 1 Stator, 1-1 Stator yoke, 1-2 Outer stator teeth, 1-3 Inner stator teeth, 1-3-1 Inner left stator teeth, 1-3-2 Inner middle stator teeth, 1-3-3 Inner right stator teeth, 1-4 Outer stator winding, 1-4-1 Outer left winding, 1-4-2 Outer right winding, 1-5 Inner stator winding, 1-5-1 Inner left winding, 1-5-2 Inner right winding, 2 Rotor, 2-1 N-pole permanent magnet, 2-1-1 N-pole left permanent magnet, 2-1-2 N-pole right permanent magnet, 2-2 S-pole permanent magnet, 2-2-1 S-pole left permanent magnet, 2-2-2 S-pole right permanent magnet, 2-3 Rotor core. Detailed Implementation

[0030] The present invention will now be described in further detail with reference to the accompanying drawings. For ease of explanation, the present invention uses the following example: the number of phases m1=3 for the external stator windings 1-4 of the dual-winding generator, the number of phases m2=3 for the internal stator windings 1-5, and the number of slots Z corresponding to the external stator teeth 1-2. s1 =12, Number of slots Z corresponding to internal stator teeth 1-3 s2 =36, Number of poles Z of rotor 2 r =8. The case where the number of splits of the permanent magnet k=1 is taken as an embodiment of the present invention.

[0031] The present invention provides a stator split-tooth structure dual-winding generator, 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, an outer stator tooth 1-2, an inner stator tooth 1-3, an outer stator winding 1-4, and an inner stator winding 1-5. The teeth of the stator 1 have a split structure, including the outer stator tooth 1-2 and the inner stator tooth 1-3; the inner stator tooth 1-3 includes an inner left stator tooth 1-3-1, an inner middle stator tooth 1-3-2, and an inner right stator tooth 1-3-3. The outer stator tooth 1-2 is located outside the inner stator tooth 1-3, both on one side of the stator yoke 1-1, and evenly distributed along the circumference. The outer stator winding 1-4 and the inner stator winding 1-5 are both concentrated windings, wound on the outer stator tooth 1-2 and the inner stator tooth 1-3, respectively. The rotor 2 includes an N-pole permanent magnet 2-1, an S-pole permanent magnet 2-2, and a rotor core 2-3.

[0032] Figure 2 This is a partially enlarged view of the stator of the dual-winding generator with a split-tooth stator structure according to the present invention. It can be seen that both the outer stator winding 1-4 and the inner stator winding 1-5 are double-layer windings; the outer stator winding 1-4 includes an outer left winding 1-4-1 and an outer right winding 1-4-2; the inner stator winding 1-5 includes an inner left winding 1-5-1 and an inner right winding 1-5-2.

[0033] 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 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 also has a split structure with a splitting number k equal to 1, comprising the left S-pole permanent magnet 2-2-1 and the right S-pole permanent magnet 2-2-2. 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 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 .

[0034] Because the dual-winding generator proposed in this invention adopts a radial flux scheme, the stator and rotor structures are simple, and the rotor permanent magnet adopts a split structure that is surface-mounted on one side of the rotor core, the generator has a simple structure and process, and is easy to manufacture.

[0035] Figure 3 and Figure 4 These are the stator slot numbers and winding wiring diagrams for an embodiment of a dual-winding generator with a split-tooth stator structure according to the present invention. It can be seen that the outer stator windings 1-4 form the A, B, and C three-phase windings on one electrical port, while the inner stator windings 1-5 form the U, V, and W three-phase windings on the other electrical port. The A, B, and C three-phase windings on one electrical port have 8 poles, and the U, V, and W three-phase windings on the other electrical port have 24 poles.

[0036] Figure 5 This is an unloaded magnetic field distribution diagram of an embodiment of the stator split-tooth structure dual-winding generator of the present invention. It can be seen that the number of slots Z corresponds to slots 1-2 in the outer stator teeth section. s1 =12, Number of slots Z corresponding to internal stator teeth 1-3 s2 =36, Rotor 2-pole number Z rIn embodiment 8, the use of split-structure N-pole permanent magnets 2-1 and S-pole permanent magnets 2-2 results in a noticeable splitting of the magnetic field 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 is evident that the split-structure N-pole permanent magnets 2-1 and S-pole permanent magnets 2-2 not only retain the 4th spatial harmonic in the air gap magnetic flux density but also introduce a higher content of the 12th spatial harmonic. The original 4th spatial harmonic and the newly added 12th spatial harmonic in the air gap magnetic flux density will induce electromotive forces in the 8-pole A, B, C three-phase windings and the 24-pole U, V, W three-phase windings, respectively.

[0037] 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.

[0038] The dual-port output scheme of an embodiment of a stator split-tooth structure dual-winding generator of the present invention is 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 72V 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.

[0039] To facilitate the explanation of the embodiments of the present invention, the above description assumes that the number of phases m1=3 for the external stator windings 1-4 of the dual-winding generator, the number of phases m2=3 for the internal stator windings 1-5, and the number of slots Z corresponding to the external stator teeth 1-2. s1 =12, Number of slots Z corresponding to internal stator teeth 1-3 s2 =36, Number of poles Z of rotor 2 r The case with 8 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 of the external stator windings 1-4 and m2 of the internal stator windings 1-5 of the dual-winding generator are both positive integers; the number of slots Z corresponding to the external stator teeth 1-2 is... s1 Equal to a positive integer multiple of the phase number m1, and the number of slots Z corresponding to internal stator teeth 1-3. s2Equal to a positive integer multiple of the number of phases m2, and the number of poles Z of rotor 2. r Z is a positive even number and satisfies: s1 / m1 / GCD(Z s1 Z r ) and Z s2 / m2 / GCD(Z s2 Z r ×(2k+1)) are all positive integers, where the number of splits k is a natural number, GCD is the greatest common divisor, and Z s2 For Z s1 A positive integer multiple of.

[0040] 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 4th and 12th spatial harmonics of the air gap magnetic flux density, respectively. The 12th harmonic electromotive force induced by the 12th 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 4th harmonic electromotive force induced by the 4th 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 4th and 20th spatial harmonics of the air gap magnetic flux density, respectively. The 20th harmonic electromotive force induced by the 20th 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 4th harmonic electromotive force induced by the 4th 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.

[0041] 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.

[0042] 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 stator-split-tooth structure dual-winding generator, comprising a stator (1) and a rotor (2), characterized in that: The stator (1) and rotor (2) are coaxially mounted; the teeth of the stator (1) are of a split structure, consisting of a stator yoke (1-1), an outer stator tooth (1-2), an inner stator tooth (1-3), an outer stator winding (1-4), and an inner stator winding (1-5); the permanent magnets of the rotor (2) are of a split structure, consisting of 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 attached to one side of the rotor core (2-3), which enables the magnetic lines of force at the generator poles to split; both the outer stator winding (1-4) and the inner stator winding (1-5) are double-layer windings; the outer stator winding (1-4) contains... The system comprises an outer left-side winding (1-4-1) and an outer right-side winding (1-4-2); the inner stator winding (1-5) comprises an inner left-side winding (1-5-1) and an inner right-side winding (1-5-2); the inner stator teeth (1-3) comprises an inner left-side stator tooth (1-3-1), an inner middle stator tooth (1-3-2), and an inner right-side stator tooth (1-3-3); the N-pole permanent magnet (2-1) has a split structure with a split number of k, comprising an N-pole left-side permanent magnet (2-1-1) and an N-pole right-side permanent magnet (2-1-2); the S-pole permanent magnet (2-2) also has a split structure with a split number of k, comprising an S-pole left-side permanent magnet (2-2-1) and an S-pole right-side permanent magnet (2-2-2); where k is a natural number.

2. The stator split-tooth structure dual-winding generator according to claim 1, characterized in that: The external stator teeth (1-2) are located outside the internal stator teeth (1-3), and are all located on one side of the stator yoke (1-1), and are evenly distributed along the circumferential direction.

3. The stator split-tooth structure dual-winding generator according to claim 1, characterized in that: The outer stator winding (1-4) and the inner stator winding (1-5) are both concentrated windings, and are respectively wound on the outer stator teeth (1-2) and the inner stator teeth (1-3).

4. The stator split-tooth structure dual-winding generator according to claim 1, characterized in that, The number of phases m1 of the external stator winding (1-4) and m2 of the internal stator winding (1-5) are both positive integers; the number of slots Z corresponding to the external stator teeth (1-2) s1 The number of slots Z corresponding to the internal stator teeth (1-3) is equal to a positive integer multiple of the phase number m1. s2 Equal to a positive integer multiple of the number of phases m2; the number of poles Z of rotor (2) r It is a positive even number and satisfies: Z s1 / m1 / GCD(Z s1 Z r ) and Z s2 / m2 / GCD(Z s2 Z r ×(2k+1)) are all positive integers, and Z s2 For Z s1 A positive integer multiple of , where the number of splits k is a natural number and GCD is the greatest common divisor.

5. The stator split-tooth structure dual-winding generator according to claim 1, characterized in that: The N-pole permanent magnet (2-1) and the S-pole permanent magnet (2-2) are alternately distributed along the circumference and attached to one side of the rotor core (2-3).

6. The stator split-tooth structure dual-winding generator according to claim 1, characterized in that: The permanent magnet on the left side of the N pole (2-1-1) and the permanent magnet on the right side of the N pole (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 .

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