CN112542903A - Three-phase hybrid excitation doubly salient motor structure - Google Patents
Three-phase hybrid excitation doubly salient motor structure Download PDFInfo
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- CN112542903A CN112542903A CN202011271748.7A CN202011271748A CN112542903A CN 112542903 A CN112542903 A CN 112542903A CN 202011271748 A CN202011271748 A CN 202011271748A CN 112542903 A CN112542903 A CN 112542903A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/12—Stationary parts of the magnetic circuit
- H02K1/14—Stator cores with salient poles
- H02K1/146—Stator cores with salient poles consisting of a generally annular yoke with salient poles
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/12—Stationary parts of the magnetic circuit
- H02K1/17—Stator cores with permanent magnets
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/24—Rotor cores with salient poles ; Variable reluctance rotors
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K3/00—Details of windings
- H02K3/04—Windings characterised by the conductor shape, form or construction, e.g. with bar conductors
- H02K3/28—Layout of windings or of connections between windings
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K2213/00—Specific aspects, not otherwise provided for and not covered by codes H02K2201/00 - H02K2211/00
- H02K2213/03—Machines characterised by numerical values, ranges, mathematical expressions or similar information
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Permanent Magnet Type Synchronous Machine (AREA)
Abstract
The invention discloses a three-phase hybrid excitation doubly salient motor structure, wherein a stator and a rotor of the three-phase hybrid excitation doubly salient motor structure are both salient pole tooth socket structures, a stator tooth socket is arranged between adjacent stator poles, a three-phase armature winding is arranged in each stator tooth socket, a direct current excitation winding is arranged in every two stator tooth sockets of every four stator teeth, and the three-phase armature winding and the direct current excitation winding are both concentrated windings; permanent magnets are arranged at the opening of each stator tooth slot, and the permanent magnets on two sides of the same stator pole have the same polarity. The invention not only solves the problem that the excitation element is required to be placed in each stator slot of the traditional electro-magnetic doubly salient motor to cause insufficient excitation slot area, but also solves the problem of asymmetric contact of the stator pole and the rotor pole caused by adopting a parallel tooth slot structure; after the permanent magnet is added, the torque output of the motor can be improved, and the copper loss of the motor can be reduced; meanwhile, the permanent magnet is placed at a position which avoids the demagnetization problem of the permanent magnet, the reliability and the utilization rate of the permanent magnet are improved, and the electromagnetic compatibility of the motor is greatly improved.
Description
Technical Field
The invention relates to the technical field of motor body design, in particular to a three-phase hybrid excitation doubly salient motor structure.
Background
The motor is an indispensable power element in the industrialized society, and the traditional permanent magnet motor has relatively high motor efficiency and power density due to the action of the permanent magnet, but the further development of the permanent magnet motor is limited by the demagnetization problem. The double salient pole motor is a novel special motor developed in recent years, a stator and a rotor of the double salient pole motor are both in a salient pole tooth groove structure, a stator armature winding is a centralized winding, no winding is arranged on the rotor, the structure is simple, the operation is reliable, and the double salient pole motor is suitable for high-speed operation and severe working environment. In addition, the doubly salient motor does not need the participation of a power converter in a power generation state, and the control is more convenient. Therefore, the double salient pole motor is more and more widely applied in the fields of aerospace, ship industry, green energy and the like. The flux switching motor is a form of a double salient pole motor, a permanent magnet is embedded into a stator yoke of the traditional flux switching motor, an air gap magnetic field is generated by the permanent magnet and cannot be adjusted, so that the speed range of the motor is limited, and the problem of high-temperature demagnetization of the permanent magnet is difficult to solve.
Disclosure of Invention
The invention aims to solve the technical problem of providing a three-phase hybrid excitation doubly salient motor structure aiming at the defects related in the background technology.
The invention adopts the following technical scheme for solving the technical problems:
a three-phase hybrid excitation doubly salient motor structure comprises a stator and a rotor;
the stator and the rotor are both in a salient pole tooth slot structure, the number of stator poles arranged on a stator core is 8n, the number of rotor poles is 16n/3, n is a multiple of 3, a stator tooth slot is arranged between adjacent stator poles, a three-phase armature winding is arranged in each stator tooth slot, a direct current excitation winding is distributed across four stator poles, and the polarities of the adjacent direct current excitation windings are opposite; permanent magnets are arranged at the opening of each stator tooth slot, and the permanent magnets on two sides of the same stator pole have the same polarity;
the three-phase armature winding and the direct-current excitation winding are both concentrated windings.
As a further optimization scheme of the structure of the three-phase hybrid excitation doubly salient motor, the stator and the rotor are both formed by punching silicon steel sheets.
As a further optimization scheme of the structure of the three-phase hybrid excitation doubly salient motor, the permanent magnet is magnetized neodymium iron boron or ferrite.
As a further optimization scheme of the structure of the three-phase hybrid excitation doubly salient motor, the surface of the permanent magnet and the surface of the stator pole are on the same plane.
As a further optimization scheme of the structure of the three-phase hybrid excitation doubly salient motor, the stator pole pitch of the stator is 2 times of the length of a stator pole arc, and the length of the pole arc of the rotor is equal to or greater than the length of the stator pole arc.
Compared with the prior art, the invention adopting the technical scheme has the following technical effects:
1. the stator and rotor salient pole tooth socket structure is provided, and the rotor is not provided with a winding, so that the structure is simple and the operation is reliable;
2. the excitation winding is wound across four stator poles, so that excitation magnetic flux is uniformly distributed, and under the condition of neglecting leakage magnetic flux, when the rotor rotates, the magnetic potential of the hinge at any moment is close to sine, and sine armature current with the same phase as the magnetic potential is introduced, so that output pulsation is very small;
3. because the permanent magnet excitation is added, the power density of the motor is increased, and the overall performance of the motor is improved;
4. the permanent magnets are not embedded in the stator teeth or the stator yoke, so that the structural strength of the motor is not reduced;
5. the permanent magnet is placed at the opening of the stator slot, so that the inherent demagnetization problem of the permanent magnet is solved;
6. the invention does not need to adopt the design of pole shoes with left and right symmetrical stator poles for solving the asymmetric contact by adopting the traditional electro-magnetic doubly salient motor, thereby reducing the process difficulty.
Drawings
Fig. 1 is a schematic structural diagram of a three-phase hybrid excitation doubly salient motor structure of the present invention;
fig. 2(a), fig. 2(b) and fig. 2(c) are schematic diagrams of magnetic fluxes of only and only matching direct-current excitation, permanent magnets and direct-current excitation in the three-phase hybrid excitation doubly-salient motor of the invention respectively;
fig. 3 is a flux linkage waveform diagram of a three-phase hybrid excitation doubly salient motor of the invention.
In the figure, 1-stator, 2-field winding, 3-armature winding, 4-permanent magnet, 5-rotor, 6-stator pole, 7-stator slot.
Detailed Description
The technical scheme of the invention is further explained in detail by combining the attached drawings:
the present invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. In the drawings, components are exaggerated for clarity.
The invention discloses a three-phase hybrid excitation doubly salient motor structure, which comprises a stator and a rotor, wherein the rotor is connected with the stator;
the stator and the rotor are both in a salient pole tooth slot structure, the number of stator poles arranged on a stator core is 8n, the number of rotor poles is 16n/3, n is a multiple of 3, a stator tooth slot is arranged between adjacent stator poles, a three-phase armature winding is arranged in each stator tooth slot, a direct current excitation winding is distributed across four stator poles, and the polarities of the adjacent direct current excitation windings are opposite; permanent magnets are arranged at the opening of each stator tooth slot, and the permanent magnets on two sides of the same stator pole have the same polarity;
the three-phase armature winding and the direct-current excitation winding are both concentrated windings.
The stator and the rotor can be formed by stamping silicon steel sheets, the permanent magnet preferably adopts magnetized neodymium iron boron or ferrite, and the surface of the permanent magnet and the surface of the stator pole have better effect on the same plane. The stator pole pitch of the stator is preferably 2 times of the stator pole arc length, and the rotor pole arc length is equal to or greater than the stator pole arc length.
The following explanation is made by using an 24/16-pole three-phase hybrid excitation doubly salient motor:
as shown in fig. 1, in the 24/16-pole three-phase hybrid excitation doubly salient motor structure, a stator and a rotor are both salient pole tooth slot structures, the stator comprises 24 stator poles, a stator tooth slot is formed between every two adjacent stator poles, a three-phase armature winding is arranged in each stator tooth slot, each excitation winding is wound across four stator poles, direct current excitation windings in each stator tooth slot are the same, and the direct current excitation windings in two adjacent stator tooth slots are opposite in polarity; each phase of armature winding consists of 8 coils, 4 coils in the 8 coils of each phase of armature winding are close to the excitation winding, the magnetic circuit reluctance of the turn chain is small, the other 4 coils are far from the excitation winding, the magnetic circuit reluctance of the turn chain is large, and each phase of armature winding consists of the coils which are connected in series, so that the magnetic flux paths of each phase of the motor are consistent after the armature winding is integrally combined; the three-phase armature winding and the direct-current excitation winding are both concentrated windings; the permanent magnets are arranged at the opening of each stator tooth slot respectively, and the permanent magnets on two sides of one stator pole are of the same polarity. The rotor and the stator are both formed by laminating silicon steel sheets; the permanent magnet is magnetized Ru-Fe-B or ferrite; the side surface of the permanent magnet and the surface of the stator pole are on the same plane; the distance between adjacent stator pole end parts is 2 times of the arc length of the stator pole end parts; the rotor has salient pole teeth outwards, and the arc length of the rotor pole end is equal to or greater than that of the stator pole end.
The basic working principle of the invention is as follows: as shown in fig. 2(a), when only the permanent magnet is excited, the magnetic flux generated by the permanent magnet does not connect to the rotor, and the magnitude of the magnetic flux does not change with the change in the position of the rotor. The generated constant magnetic flux is only in the salient pole stator teeth and the stator yoke, and therefore no induced electromotive force is generated. If there is no permanent magnet, only the dc field coil acts, and the field flux generated by it will connect the stator and rotor through the air gap, as shown in fig. 2 (b). As the rotor rotates, an induced electromotive force is induced in the coil. Theoretically, there will be a conversion of electromagnetic energy in the motor. As shown in fig. 2(c), if the permanent magnets and the dc coil windings are simultaneously operated, the magnetic fluxes generated from the two sources penetrate the stator and the rotor through the air gap, which further contributes to the generation and variation of the induced electromotive force. Due to the electromagnetic attraction between the two excitation fields, the flux generated by the permanent magnets will now also connect the stator and the rotor via the air gap. And the magnetic flux of the permanent magnet connected with the stator and the rotor depends on the size of the direct current excitation current and the saturation degree of a magnetic circuit.
Fig. 3 shows a flux linkage waveform diagram of the hybrid excitation doubly salient motor of the invention. As can be seen from the figure, compared with the traditional mode of placing an excitation winding in each stator slot, the novel excitation winding mode is adopted, and all the phase flux linkages of the hybrid excitation doubly salient motor are mutually symmetrical.
It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
The above-mentioned embodiments, objects, technical solutions and advantages of the present invention are further described in detail, it should be understood that the above-mentioned embodiments are only illustrative of the present invention and are not intended to limit the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (5)
1. The utility model provides a double salient pole motor structure of three-phase hybrid excitation, includes stator and rotor, its characterized in that:
the stator and the rotor are both in a salient pole tooth slot structure, the number of stator poles arranged on a stator core is 8n, the number of rotor poles is 16n/3, n is a multiple of 3, a stator tooth slot is arranged between adjacent stator poles, a three-phase armature winding is arranged in each stator tooth slot, a direct current excitation winding is distributed across four stator poles, and the polarities of the adjacent direct current excitation windings are opposite; permanent magnets are arranged at the opening of each stator tooth slot, and the permanent magnets on two sides of the same stator pole have the same polarity;
the three-phase armature winding and the direct-current excitation winding are both concentrated windings.
2. The structure of a three-phase hybrid excitation doubly salient motor according to claim 1, wherein the stator and the rotor are each stamped from a sheet of silicon steel.
3. The structure of a three-phase hybrid excitation doubly salient motor according to claim 1, wherein the permanent magnet is magnetized neodymium iron boron or ferrite.
4. The structure of a three-phase hybrid excitation doubly salient motor according to claim 1, wherein the surface of the permanent magnet is on the same plane as the surface of the stator pole.
5. A three-phase hybrid excitation doubly salient motor structure according to claim 1, wherein a stator pole pitch of said stator is 2 times a stator pole arc length, and a pole arc length of said rotor is equal to or greater than a stator pole arc length.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011271748.7A CN112542903A (en) | 2020-11-13 | 2020-11-13 | Three-phase hybrid excitation doubly salient motor structure |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011271748.7A CN112542903A (en) | 2020-11-13 | 2020-11-13 | Three-phase hybrid excitation doubly salient motor structure |
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| Publication Number | Publication Date |
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| CN112542903A true CN112542903A (en) | 2021-03-23 |
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| CN202011271748.7A Pending CN112542903A (en) | 2020-11-13 | 2020-11-13 | Three-phase hybrid excitation doubly salient motor structure |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113809843A (en) * | 2021-08-27 | 2021-12-17 | 南京航空航天大学 | Three-phase symmetrical 12k/8k electro-magnetic doubly salient motor |
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| CN101127461A (en) * | 2007-07-13 | 2008-02-20 | 南京航空航天大学 | Mixed excitation dual protruding pole brushless DC generator |
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| CN105790456A (en) * | 2016-04-29 | 2016-07-20 | 南京航空航天大学 | Three-phase mixed excitation magnetic flux switching motor structure |
| CN107134866A (en) * | 2017-04-24 | 2017-09-05 | 天津大学 | Double winding bearing-free flux switch permanent magnet motor |
| CN107240970A (en) * | 2017-05-19 | 2017-10-10 | 北京航空航天大学 | A kind of 12/10 permanent magnetism additive excitation switched reluctance machines |
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2020
- 2020-11-13 CN CN202011271748.7A patent/CN112542903A/en active Pending
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| CN108808895A (en) * | 2018-05-03 | 2018-11-13 | 南京理工大学 | A kind of π types mixed excitation biconvex pole motor T |
| CN110289707A (en) * | 2019-07-18 | 2019-09-27 | 浙江大学 | A kind of LTL type double-salient-pole mixed excitation generator |
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Cited By (1)
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| CN113809843A (en) * | 2021-08-27 | 2021-12-17 | 南京航空航天大学 | Three-phase symmetrical 12k/8k electro-magnetic doubly salient motor |
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Application publication date: 20210323 |