CN115765235A - Double-stator magnetic field modulation arc permanent magnet direct drive motor - Google Patents
Double-stator magnetic field modulation arc permanent magnet direct drive motor Download PDFInfo
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- CN115765235A CN115765235A CN202211589420.9A CN202211589420A CN115765235A CN 115765235 A CN115765235 A CN 115765235A CN 202211589420 A CN202211589420 A CN 202211589420A CN 115765235 A CN115765235 A CN 115765235A
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Abstract
The invention belongs to the technical field of magnetic field modulation permanent magnet motors, and particularly discloses a double-stator magnetic field modulation arc permanent magnet direct drive motor. The motor includes an outer stator, an inner stator, a rotor, an outer armature winding, and an inner armature winding. The invention can effectively improve the space utilization rate by adopting a double-stator structure; the motor adopts two sets of armature windings to participate in electromagnetic energy conversion, so that the torque and the power density can be effectively improved; meanwhile, the motor can generate abundant inner and outer air gap magnetic density working harmonic waves by utilizing the modulation action of the outer rotor teeth on the outer stator permanent magnet magnetic field and the modulation action of the inner rotor teeth on the inner stator permanent magnet magnetic field, thereby effectively improving the torque density of the motor. In addition, the inner stator and the outer stator of the invention are both in modular design, thereby being convenient for processing and assembling and improving the practical value of engineering. The motor has the characteristic of high torque density, so that the motor has good direct-drive application prospect in occasions such as large-caliber astronomical telescope driving and the like.
Description
Technical Field
The invention belongs to the technical field of magnetic field modulation permanent magnet motors, and relates to a double-stator magnetic field modulation arc permanent magnet direct drive motor.
Background
In a large-caliber astronomical telescope driving system, a scheme of combining a motor and a gear box is usually adopted to meet the design requirement of low speed and large torque, however, the scheme brings the defects of complex mechanical structure, poor dynamic performance, low control precision and the like.
In order to solve the above problems, an arc permanent magnet direct drive motor has been proposed, which has advantages of simple structure, high torque density, and easy assembly, and has been implemented in the fields including spanish GTC telescope and european astronomical table VLT telescope.
In addition, the arc-line permanent magnet motor is also deeply researched and obtained more achievements in domestic colleges and universities and scientific research institutes. At present, most of arc line permanent magnet motors proposed at home and abroad are rotor permanent magnet type motors, namely permanent magnets are arranged on the side of a motor rotor.
However, because the stator of the permanent magnet motor of the arc line adopts a multi-section modular design, only part of the rotor permanent magnet can participate in electromagnetic energy conversion at any time when the motor works, and therefore, the utilization rate of the permanent magnet motor of the rotor permanent magnet type arc line is low.
To improve this problem, stator permanent magnet type arc permanent magnet motors have attracted some attention in recent years, and for example, patent document 1 discloses a multiple harmonic excitation type arc permanent magnet synchronous motor.
In this patent document 1, permanent magnets are arranged on the stator side, and the rotor is designed as a salient pole structure for modulating the stator permanent magnet magnetic field, thereby achieving a large torque output by utilizing the "magnetic field modulation effect".
However, the torque density of the stator permanent magnet type arc permanent magnet motor is relatively low, and how to further improve the torque density of the motor and strengthen the competitiveness of the motor in a direct-drive scheme of a large-caliber astronomical telescope is an urgent problem to be solved.
Chinese patent application, publication No.: CN 112688528A, publication date: 2021.04.20.
disclosure of Invention
Aiming at the problems in the prior art, the invention provides a double-stator magnetic field modulation arc permanent magnet direct drive motor so as to improve the torque density of the motor. In order to achieve the purpose, the invention adopts the following technical scheme:
a double-stator magnetic field modulation arc line permanent magnet direct drive motor comprises an outer stator, an inner stator, a rotor, an outer armature winding and an inner armature winding; wherein, the outer stator and the inner stator are respectively positioned at the outer side and the inner side of the rotor; air gaps are reserved between the outer stator and the rotor and between the inner stator and the rotor;
the outer stator consists of three outer stator modules with arc structures; the three outer stator modules are uniformly distributed along one circumferential direction of the outer side of the rotor; the inner stator consists of three inner stator modules with arc structures; the three inner stator modules are uniformly distributed along one circumferential direction of the inner side of the rotor; the positions of each outer stator module in the outer stator and each inner stator module in the inner stator are in one-to-one correspondence;
the structure of each outer stator module is the same, and each outer stator module consists of an outer stator yoke part, outer stator teeth, outer stator auxiliary teeth and outer stator permanent magnets; the outer stator yoke is arc-shaped, and a plurality of outer stator teeth and two outer stator auxiliary teeth are connected to the inner side of the outer stator yoke;
the two outer stator auxiliary teeth are respectively and correspondingly positioned on one end side of the outer stator yoke part; all the outer stator teeth are positioned between the two outer stator auxiliary teeth and are uniformly distributed on the inner side of the outer stator yoke part; the top of each outer stator tooth is provided with an outer stator permanent magnet, and the outer stator permanent magnet is adjacent to an iron pole at the top of the outer stator tooth where the outer stator permanent magnet is positioned;
the structure of each inner stator module is the same, and each inner stator module consists of an inner stator yoke, inner stator teeth, inner stator auxiliary teeth and an inner stator permanent magnet; the inner stator yoke is arc-shaped, and a plurality of inner stator teeth and two inner stator auxiliary teeth are connected to the outer side of the inner stator yoke;
the two inner stator auxiliary teeth are respectively and correspondingly positioned at one end side of the yoke part of the inner stator; all the inner stator teeth are positioned between the two inner stator auxiliary teeth and are uniformly distributed on the outer side of the yoke part of the inner stator; the top of each inner stator tooth is provided with an inner stator permanent magnet, and the inner stator permanent magnet is adjacent to an iron pole at the top of the inner stator tooth where the inner stator permanent magnet is positioned;
the outer armature winding is wound on the outer stator teeth, and the inner armature winding is wound on the inner stator teeth;
the rotor adopts a bilateral salient pole structure and consists of a rotor yoke part, outer rotor teeth and inner rotor teeth; rotor yoke portion is the ring shape, and outer rotor tooth has a plurality ofly and along the outside circumferencial direction evenly distributed of rotor yoke portion, and interior rotor tooth has a plurality ofly and along the inboard circumferencial direction evenly distributed of rotor yoke portion, and outer rotor tooth equals and the one-to-one in the position of rotor yoke portion with the quantity of interior rotor tooth.
The invention has the following advantages:
as described above, the invention relates to a double-stator magnetic field modulation arc permanent magnet direct drive motor, which can effectively improve the space utilization rate by adopting an inner and outer double-stator structure; in addition, the motor adopts two sets of armature windings (namely an outer armature winding and an inner armature winding) to participate in electromagnetic energy conversion, so that the torque and the power density can be effectively improved; meanwhile, the motor can generate abundant inner and outer air gap magnetic density working harmonic waves by utilizing the modulation action of the outer rotor teeth on the outer stator permanent magnet field and the modulation action of the inner rotor teeth on the inner stator permanent magnet field, thereby effectively improving the torque density of the motor. In addition, the inner stator and the outer stator of the motor are in modular design, so that the motor is convenient to process and assemble, and the engineering practical value is improved. The motor has the characteristic of high torque density, so that the motor has good direct-drive application prospect in occasions such as large-caliber astronomical telescope driving and the like.
Drawings
Fig. 1 is a cross-sectional structural view of a double-stator magnetic field modulation arc permanent magnet direct drive motor in the embodiment of the invention.
Fig. 2 is a cross-sectional structural view of an outer stator module of the double-stator magnetic field modulation arc permanent magnet direct drive motor in the embodiment of the present invention, where the arrow direction in the figure indicates the magnetizing direction of the outer stator permanent magnet.
Fig. 3 is a cross-sectional structural view of an inner stator module of a double-stator magnetic field modulation arc permanent magnet direct drive motor in the embodiment of the invention, wherein the arrow direction in the cross-sectional structural view indicates the magnetizing direction of the inner stator permanent magnet.
Fig. 4 is a schematic cross-sectional structure diagram of a rotor of a double-stator magnetic field modulation arc permanent magnet direct drive motor in the embodiment of the present invention.
Fig. 5 is a no-load magnetic line distribution diagram of the double-stator magnetic field modulation arc permanent magnet direct drive motor in the embodiment of the invention.
Fig. 6 is a waveform diagram of the magnetic flux densities of the inner and outer air gaps of the double-stator magnetic field modulation arc permanent magnet direct drive motor in the embodiment of the invention.
Fig. 7 is a fourier harmonic analysis diagram of the magnetic flux density of the inner and outer air gaps of the double-stator magnetic field modulation arc permanent magnet direct drive motor in the embodiment of the present invention.
Fig. 8 is a no-load counter electromotive force diagram of a double-stator magnetic field modulation arc permanent magnet direct drive motor in the embodiment of the invention.
Wherein, I-outer stator, II-inner stator, III-rotor, IV-outer armature winding, V-inner armature winding, 1-outer stator module, 2-inner stator module, 11-outer stator yoke, 12-outer stator teeth, 13-outer stator auxiliary teeth, 14-outer stator permanent magnet, 15-iron pole, 21-inner stator yoke, 22-inner stator tooth, 23-inner stator auxiliary tooth, 24-inner stator permanent magnet, 25-iron pole, 31-rotor yoke, 32-outer rotor tooth and 33-inner rotor tooth.
Detailed Description
The invention is described in further detail below with reference to the following figures and detailed description:
as shown in fig. 1, the present embodiment describes a double-stator field modulation arc permanent magnet direct drive motor, which includes an outer stator I, an inner stator II, a rotor III, an outer armature winding IV, and an inner armature winding V.
The outer stator I is positioned on the outer side of the rotor III, and an outer air gap is reserved between the outer stator I and the rotor III. The inner stator II is positioned at the inner side of the rotor III, and an inner air gap is reserved between the inner stator II and the rotor III.
The thickness of the air gap is related to the power rating of the motor, the chosen permanent magnet material and the motor assembly process.
The outer stator I consists of three outer stator modules 1 with arc structures. Wherein, three outer stator modules 1 are uniformly distributed along a circumferential direction of the outer side of the rotor III. The inner stator II consists of three inner stator modules 2 with arc structures; wherein, three inner stator modules 2 are uniformly arranged along a circumferential direction of the inner side of the rotor III, as shown in figure 1.
The positions of each outer stator module 1 in the outer stator I and each inner stator module 2 in the inner stator II are in one-to-one correspondence. The correspondence here means a radial correspondence, i.e. each outer stator module 1 corresponds to one inner stator module 2 in the radial direction.
The structures of the outer stator modules 1 are the same, and each outer stator module 1 is composed of an outer stator yoke 11, outer stator teeth 12, outer stator auxiliary teeth 13 and outer stator permanent magnets 14, as shown in fig. 2.
The outer stator yoke 11 is arc-shaped, and a plurality of outer stator teeth 12 and two outer stator auxiliary teeth 13 are connected to the inner side of the outer stator yoke 11; wherein, the arrangement of outer stator tooth 12 and outer stator auxiliary tooth 13 is as follows:
the two outer stator auxiliary teeth 13 are respectively located at one end side of the outer stator yoke 11, where the two end sides specifically refer to a set of opposite end sides along the extending direction of the outer stator yoke 11, as shown in fig. 2.
In this embodiment, the two outer stator auxiliary teeth 13 are respectively located at one end side of the outer stator module 1, which can play a role in guiding the circulation of a magnetic circuit, and can reduce the abrupt change of a magnetic field caused by the edge effect, thereby reducing the torque ripple.
All the outer stator teeth 12 in the same outer stator module 1 are located between two outer stator auxiliary teeth 13 and each outer stator tooth 12 is evenly distributed inside the outer stator yoke 11.
An outer stator permanent magnet 14 is mounted at the top of each outer stator tooth 12, and the outer stator permanent magnet 14 is adjacent to an iron pole 15 at the top of the outer stator tooth 12 where the outer stator permanent magnet 14 is located.
The outer stator permanent magnets 14 mounted on top of the outer stator teeth 12 are all magnetized radially outward as shown by the arrows in fig. 2.
In the same outer stator module 1, when viewed from the direction from one end side to the other end side of the outer stator yoke 11, the outer stator permanent magnets 14 on every two adjacent outer stator teeth 12 and the iron poles 15 at the tops of the outer stator teeth 12 form a pair of pole permanent magnets.
The arrangement mode of the antipole permanent magnet is 'iron pole 15-outer stator permanent magnet 14-iron pole 15'.
In the embodiment, the outer stator permanent magnet 14 is adjacent to the iron poles 15 and forms the arrangement of the permanent magnets with alternate poles, and compared with the traditional arrangement structure of the 'NS' permanent magnets, the arrangement structure reduces the using amount of the permanent magnets and reduces the risk of demagnetization of the permanent magnets.
The structures of the respective inner stator modules 2 are the same, and each inner stator module 2 is composed of an inner stator yoke 21, inner stator teeth 22, inner stator auxiliary teeth 23, and inner stator permanent magnets 24, as shown in fig. 3.
The inner stator yoke 21 is arc-shaped, and a plurality of inner stator teeth 22 and two inner stator supplementary teeth 23 are coupled to an outer side of the inner stator yoke 21. The inner stator teeth 22 and the inner stator auxiliary teeth 23 are arranged as follows:
two inner stator auxiliary teeth 23 are respectively positioned at one end side of the inner stator yoke 21 correspondingly; the two end sides here specifically refer to a set of opposite end sides in the extension direction of the outer inner stator yoke 21, as shown in fig. 3.
In the present embodiment, the two inner stator auxiliary teeth 23 are respectively located at one end side of the inner stator module 2, which can play a role of guiding the circulation of the magnetic circuit, and can reduce the abrupt change of the magnetic field caused by the edge effect, thereby reducing the torque ripple.
All the inner stator teeth 22 in the same inner stator module 2 are located between two inner stator auxiliary teeth 23, and the inner stator teeth 22 are evenly distributed outside the inner stator yoke 21.
An inner stator permanent magnet 24 is installed at the top of each inner stator tooth 22, and the inner stator permanent magnet 24 is adjacent to an iron pole 25 at the top of the inner stator tooth 22 where the inner stator permanent magnet 24 is located.
The inner stator permanent magnets 24 mounted on top of the inner stator teeth 22 are all magnetized radially inward as indicated by the arrows in fig. 3.
The inner stator permanent magnet 24 on each two adjacent inner stator teeth 22 and the iron pole at the top of the inner stator teeth 22 form a pair of pole permanent magnets in the same inner stator module 2 as viewed from the direction of one end side of the inner stator yoke 21 to the other end side.
The arrangement mode of the antipole permanent magnet is 'iron pole 25-inner stator permanent magnet 24-iron pole 25'.
In the embodiment, the stator permanent magnet 24 and the iron pole 25 are adjacent to each other and form the arrangement of the permanent magnets with alternate poles, and compared with the traditional arrangement structure of the 'NS' permanent magnets, the arrangement structure reduces the consumption of the permanent magnets and reduces the risk of demagnetization of the permanent magnets.
As shown in fig. 4, the rotor III in the present embodiment employs a double-sided salient pole structure.
The rotor III is composed of a rotor yoke 31, outer rotor teeth 32, and inner rotor teeth 33. The outer rotor teeth 32 are used for modulating the magnetic field of the outer stator permanent magnets 14, and the inner rotor teeth 22 are used for modulating the magnetic field of the inner stator permanent magnets 24.
The rotor yoke 31 is circular ring-shaped, and a plurality of outer rotor teeth 32 are uniformly distributed along the outer circumferential direction of the rotor yoke 31. The inner rotor teeth 33 are plural and uniformly distributed along the inner circumferential direction of the rotor yoke 31.
The number of outer rotor teeth 32 is equal to the number of inner rotor teeth 33, and the outer rotor teeth and the inner rotor teeth correspond to each other at positions of the rotor yoke 31.
The rotor III has no permanent magnet, so the rotor III has the advantages of simple structure and high mechanical strength.
The outer armature winding IV is wound around the outer stator teeth 12 and the inner armature winding V is wound around the inner stator teeth 22.
The outer armature winding IV and the inner armature winding V both adopt a non-overlapping concentrated winding form, so that the length of the end part is favorably reduced, the copper consumption is reduced, and the operation efficiency of the double-stator magnetic field modulation arc permanent magnet direct drive motor is improved.
The armature windings of the three phases of the outer stator module 1 are connected in series to form a complete three-phase outer armature winding IV. The armature windings of each phase of the three inner stator modules 2 are connected in series to form a complete three-phase inner armature winding V. The outer armature winding IV and the inner armature winding V are connected in series in the same phase.
In the embodiment, the iron cores of the outer stator I, the inner stator II and the rotor III of the motor are all formed by laminating silicon steel sheets, the thickness of the silicon steel sheets is usually selected from 0.35mm to 0.5mm, and the laminating coefficient is about 0.95.
In this embodiment, the materials of the outer stator permanent magnet 14 and the inner stator permanent magnet 24 may be selected according to the performance requirement of the motor, the operating temperature and the cost, for example, permanent magnet materials such as neodymium iron boron or ferrite are used.
As shown in fig. 5 to 8, in the embodiment, the double-stator magnetic field modulation arc permanent magnet direct drive motor works based on the "magnetic field modulation effect", and the operation principle is as follows:
without considering rotor saliency, the harmonic components in the inner and outer air gap flux densities of the motor contain only the initial harmonics contributed by the inner and outer stator permanent magnet magnetomotive forces, including the 6 th harmonic, the 12 th harmonic, and the 18 th harmonic. But since the inner and outer stator permanent magnets are stationary, these stationary harmonics cannot participate in the generation of back emf and torque as operating harmonics. In order to enable the motor to work normally and fully utilize the 'magnetic field modulation effect' to realize large torque output, the invention relates to a motor which adopts a double-sided salient pole structure, and rich modulation harmonic waves including 5 th harmonic wave, 7 th harmonic wave, 17 th harmonic wave and the like can be generated in the magnetic flux density of an inner air gap and an outer air gap by utilizing the modulation effect of outer rotor teeth 32 on the magnetic field of an outer stator permanent magnet 14 and the modulation effect of inner rotor teeth 33 on the magnetic field of an inner stator permanent magnet 24. The generated inner and outer air gap flux density modulation harmonics are rotation harmonics and can be used as working harmonics to directly participate in the generation of the counter electromotive force and the torque of the motor. Therefore, the motor of the invention can greatly improve the torque density of the motor by utilizing abundant inner and outer air gap flux density working harmonic waves, and has good direct-drive application prospect in occasions including large-caliber astronomical telescope driving and the like.
The above description is only a preferred embodiment of the present invention, and the present invention is not limited to the above embodiment, and it should be noted that any equivalent substitution, obvious modification made by those skilled in the art under the teaching of the present specification are within the spirit scope of the present specification, and the present invention should be protected.
Claims (4)
1. A double-stator magnetic field modulation arc permanent magnet direct drive motor is characterized in that,
comprises an outer stator (I), an inner stator (II), a rotor (III), an outer armature winding (IV) and an inner armature winding (V); wherein, the outer stator (I) and the inner stator (II) are respectively positioned at the outer side and the inner side of the rotor (III); air gaps are reserved between the outer stator (I) and the rotor (III) and between the inner stator (II) and the rotor (III);
the outer stator (I) consists of three outer stator modules (1) with arc structures; the three outer stator modules (1) are uniformly distributed along one circumferential direction of the outer side of the rotor (III); the inner stator (II) consists of three inner stator modules (2) with arc structures; the three inner stator modules (2) are uniformly distributed along the circumferential direction of the inner side of the rotor (III); the positions of each outer stator module (1) in the outer stator (I) and each inner stator module (2) in the inner stator (II) are in one-to-one correspondence;
the structure of each outer stator module (1) is the same, and each outer stator module (1) consists of an outer stator yoke part (11), outer stator teeth (12), outer stator auxiliary teeth (13) and outer stator permanent magnets (14); the outer stator yoke (11) is arc-shaped, and a plurality of outer stator teeth (12) and two outer stator auxiliary teeth (13) are connected to the inner side of the outer stator yoke (11);
wherein, the two outer stator auxiliary teeth (13) are respectively correspondingly positioned at one end side of the outer stator yoke part (11); all the outer stator teeth (12) are positioned between the two outer stator auxiliary teeth (13), and all the outer stator teeth (12) are uniformly distributed on the inner side of the outer stator yoke (11); the top of each outer stator tooth (12) is provided with an outer stator permanent magnet (14), and the outer stator permanent magnet (14) is adjacent to an iron pole (15) at the top of the outer stator tooth (12) where the outer stator permanent magnet (14) is positioned;
the structures of the inner stator modules (2) are the same, and each inner stator module (2) consists of an inner stator yoke part (21), inner stator teeth (22), inner stator auxiliary teeth (23) and an inner stator permanent magnet (24); the inner stator yoke (21) is arc-shaped, and a plurality of inner stator teeth (22) and two inner stator auxiliary teeth (23) are connected to the outer side of the inner stator yoke (21);
wherein, two inner stator auxiliary teeth (23) are respectively correspondingly positioned at one end side of the inner stator yoke part (21); all the inner stator teeth (22) are positioned between the two inner stator auxiliary teeth (23), and the inner stator teeth (22) are uniformly distributed on the outer side of the inner stator yoke part (21); an inner stator permanent magnet (24) is arranged at the top of each inner stator tooth (22), and the inner stator permanent magnet (24) is adjacent to an iron pole (25) at the top of the inner stator tooth (22) where the inner stator permanent magnet (24) is positioned;
the outer armature winding (IV) is wound on the outer stator teeth (12), and the inner armature winding (V) is wound on the inner stator teeth (22);
the rotor (III) adopts a bilateral salient pole structure and consists of a rotor yoke part (31), outer rotor teeth (32) and inner rotor teeth (33); the rotor yoke portion (31) is the ring shape, and outer rotor tooth (32) have a plurality ofly and along the outside circumferencial direction evenly distributed of rotor yoke portion (31), and inner rotor tooth (33) have a plurality ofly and along the inside circumferencial direction evenly distributed of rotor yoke portion (31), and outer rotor tooth (32) and inner rotor tooth (33) quantity equals and the position of rotor yoke portion (31) on the one-to-one correspondence.
2. The double stator magnetic field modulation arc permanent magnet direct drive motor of claim 1,
the magnetizing directions of the outer stator permanent magnets (14) arranged at the tops of the outer stator teeth (12) are all towards the outside in the radial direction; when viewed from the direction from one end side to the other end side of the outer stator yoke (11) in the same outer stator module (1), the outer stator permanent magnets (14) on every two adjacent outer stator teeth (12) and the iron poles (15) at the tops of the outer stator teeth (12) form a pair of pole permanent magnets, and the specific arrangement mode is 'iron pole (15) -outer stator permanent magnet (14) -iron pole (15').
3. The double stator magnetic field modulation arc permanent magnet direct drive motor as claimed in claim 1,
the magnetizing directions of the inner stator permanent magnet (24) arranged at the top of the inner stator tooth (22) are all radial inward; seen from the direction of one end side of the inner stator yoke part (21) to the other end side in the same inner stator module (2), the inner stator permanent magnets (24) on every two adjacent inner stator teeth (22) and iron poles (25) at the tops of the inner stator teeth (22) form a pair of pole permanent magnets, and the specific arrangement mode is 'iron poles (25) -inner stator permanent magnets (24) -iron poles (25').
4. The double stator magnetic field modulation arc permanent magnet direct drive motor of claim 1,
the outer armature winding (IV) and the inner armature winding (V) both adopt a non-overlapping concentrated winding form;
the armature windings of all phases of the three outer stator modules (1) are connected in series to form a complete three-phase outer armature winding (IV); the armature windings of all phases of the three inner stator modules (2) are connected in series to form a complete three-phase inner armature winding (V); the outer armature winding (IV) and the inner armature winding (V) are connected in series in the same phase.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116317223A (en) * | 2023-05-18 | 2023-06-23 | 山东科技大学 | Direct-driven type magnetic field modulation fault-tolerant permanent magnet wind driven generator |
| CN116388499B (en) * | 2023-05-26 | 2023-08-11 | 山东科技大学 | Stator modularized bilateral permanent magnet excitation type magnetic field modulation wind driven generator |
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- 2022-12-12 CN CN202211589420.9A patent/CN115765235A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116317223A (en) * | 2023-05-18 | 2023-06-23 | 山东科技大学 | Direct-driven type magnetic field modulation fault-tolerant permanent magnet wind driven generator |
| CN116388499B (en) * | 2023-05-26 | 2023-08-11 | 山东科技大学 | Stator modularized bilateral permanent magnet excitation type magnetic field modulation wind driven generator |
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