CN111917201B - Desaturation superconducting switch flux linkage motor - Google Patents
Desaturation superconducting switch flux linkage motor Download PDFInfo
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- CN111917201B CN111917201B CN202010739427.9A CN202010739427A CN111917201B CN 111917201 B CN111917201 B CN 111917201B CN 202010739427 A CN202010739427 A CN 202010739427A CN 111917201 B CN111917201 B CN 111917201B
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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
- H02K3/02—Windings characterised by the conductor material
-
- 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
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K2201/00—Specific aspects not provided for in the other groups of this subclass relating to the magnetic circuits
- H02K2201/03—Machines characterised by aspects of the air-gap between rotor and stator
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Superconductive Dynamoelectric Machines (AREA)
Abstract
The invention discloses a desaturation superconducting switch flux linkage motor, which comprises: the rotor iron core, the air gap and the stator iron core are sequentially distributed from inside to outside along the radial direction; further comprising: the low-temperature permanent magnet synchronous motor comprises an armature winding placed in a stator core slot, an excitation winding placed in the middle of a stator core tooth, magnetic steels respectively placed at the top and the bottom of the stator core tooth, and a cryostat used for wrapping the excitation winding; the rotor core and the stator core are made of ferromagnetic materials. According to the invention, the excitation winding and the armature winding are simultaneously placed on the stator, so that the motor has only one physical air gap while no rotating winding is required, and the installation difficulty is reduced; meanwhile, the stator core and the rotor core are made of ferromagnetic materials, so that the torque density of the motor can be effectively improved, and the superconducting dosage is reduced; the modular cryostat is adopted, so that the equivalent air gap flux density can be effectively reduced, and the torque density of the motor is further improved.
Description
Technical Field
The invention belongs to the field of superconducting electromagnetic devices, and particularly relates to a desaturated superconducting switch flux linkage motor.
Background
Based on classical electromagnetic theory, it is known that the torque density of an electric machine depends mainly on the electric and magnetic loads that can be selected. Due to the limitations of loss distribution, material performance, cooling and conditions which can be adopted by the large-scale wind driven generator, the electromagnetic load of the conventional large-scale motor is difficult to greatly increase at present. Thus, conventional large wind turbines tend to be only effective at increasing torque and power levels by increasing the volume and material usage. The superconducting motor adopts superconducting materials for excitation or excitation and armature, the through-current density of the superconducting motor is far higher than that of the conventional conductive materials, and the magnetic load (only an excitation winding adopts the superconducting materials, the motor is also called as a semi-superconducting motor) or the electromagnetic load (both the excitation winding and the armature winding adopt the superconducting materials, and the superconducting motor is also called as a full-superconducting motor) can be greatly improved. Therefore, the torque density of the superconducting motor is far higher than that of a conventional motor theoretically, and the superconducting motor has wide application prospect in occasions with high torque requirements.
The invention patent with the publication number of CN 104883015A discloses a double-stator superconducting field modulation motor, which is characterized in that a field coil and an armature coil are respectively arranged on two stators, the motor has small volume, light weight and high efficiency, not only exerts the characteristic that a high-temperature superconducting winding is suitable for direct current, but also avoids the problem of the necessary coolant rotary sealing in the traditional rotor excitation type high-temperature superconducting motor; the structure is simple, the motor stator adopts a modular structure, the transportation and the field installation are convenient, and the application prospect is good in occasions such as offshore wind power and the like.
However, the above superconducting motor increases difficulty in mounting and also increases mounting error due to the presence of two physical air gaps. In addition, the magnetic field generated by the superconducting magnet exciting coil is large, so that the stator tooth part is seriously saturated, and the torque density of the motor is prevented from being improved.
Disclosure of Invention
Aiming at the defects and improvement requirements of the prior art, the invention provides a desaturated superconducting switch flux linkage motor, and aims to solve the technical problems that the existing superconducting motor is difficult to install due to two physical air gaps, and the torque density of the motor is prevented from being improved due to the fact that a stator tooth part is seriously saturated due to the fact that a magnetic field generated by a superconducting magnet exciting coil is large.
To achieve the above object, the present invention provides a desaturated superconducting switching flux linkage motor, comprising:
the rotor iron core, the air gap and the stator iron core are sequentially distributed from inside to outside along the radial direction;
further comprising: the low-temperature permanent magnet synchronous motor comprises an armature winding placed in a stator core slot, an excitation winding placed in the middle of a stator core tooth, magnetic steels respectively placed at the top and the bottom of the stator core tooth, and a cryostat used for wrapping the excitation winding;
the rotor core and the stator core are made of ferromagnetic materials.
Further, the number of the excitation windings is the same as the number of slots of the stator core.
Furthermore, the excitation winding is a superconducting excitation winding, and the armature winding is a superconducting armature winding; or the excitation winding is a superconducting excitation winding, and the armature winding is a copper armature winding; or the excitation winding is a copper excitation winding, and the armature winding is a superconducting armature winding; the excitation winding adopts direct current excitation, and alternating current flows through the armature winding.
Further, the armature winding is a concentrated winding or a distributed winding.
Further, the excitation winding is a single-layer winding or a double-layer winding.
Further, the pole pair number P of the armature windingaNumber of stator slots NsThe number N of salient pole blocks of the rotorrSatisfies the following conditions:
furthermore, the magnetic steel magnetic field generated by the magnetic steel and the excitation magnetic field generated by the excitation winding are mutually offset in the stator tooth part, and the magnetic steel magnetic field is closed along the stator tooth without passing through an air gap.
Generally, by the above technical solution conceived by the present invention, the following beneficial effects can be obtained:
(1) according to the invention, the excitation winding and the armature winding are simultaneously placed on the stator, so that the motor has only one physical air gap while no rotating winding is required, and the installation difficulty is reduced; meanwhile, the stator core and the rotor core are made of ferromagnetic materials, so that the torque density of the motor can be effectively improved, and the superconducting dosage is reduced; the modular cryostat is adopted, so that the equivalent air gap flux density can be effectively reduced, and the torque density of the motor is further improved. Therefore, the invention can weaken stator tooth saturation caused by the excitation coil, effectively improve the torque density of the motor and reduce the superconducting dosage.
(2) The excitation winding and the armature winding in the invention can both adopt superconducting materials, thus greatly improving the power density of the motor and fully playing the advantages of the superconducting materials.
(3) The magnetic field generated by the magnetic steel and the magnetic field generated by the excitation winding are mutually offset in the stator tooth part, and meanwhile, the magnetic field generated by the magnetic steel is closed along the stator tooth and does not penetrate through a radial air gap. The two pieces of magnetic steel are arranged in the stator teeth and respectively comprise top magnetic steel and bottom magnetic steel, and the top magnetic steel and the bottom magnetic steel weaken the saturation of the top area and the bottom area of the stator teeth respectively, so that the torque density of the motor is effectively improved.
Drawings
Fig. 1 is a schematic structural diagram of a desaturated superconducting switching flux linkage motor provided by the present invention;
FIG. 2 is a schematic diagram of the desaturation principle provided by the present invention;
the same reference numbers will be used throughout the drawings to refer to the same or like elements or structures, wherein: 1-rotor core, 2-stator core, 3-magnetic steel, 4-armature winding, 5-excitation winding, 6-cryostat, 7-excitation magnetic field, 8-magnetic steel magnetic field, and 9-desaturation region.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
Fig. 1 shows a topology diagram of a desaturated superconducting switching flux linkage motor according to an embodiment of the present invention, and the ring structure of the motor sequentially includes an inner rotor core 1, a stator core 2, magnetic steel 3, an armature winding 4, an excitation winding 5, and a cryostat 6 from inside to outside.
Taking a semi-superconducting motor as an example, a superconducting field coil is placed on a stator tooth, and an armature copper coil is arranged in a stator groove. The armature coil adopts double-layer windings, and the number of the superconducting excitation coils is the same as that of the stator teeth. Meanwhile, each superconducting magnet coil is wrapped by a separate cryostat.
The stator iron core and the rotor iron core are made of ferromagnetic materials, such as silicon steel sheets, so that the magnetic resistance of a magnetic circuit is reduced, the required exciting current is reduced, the using amount of a superconducting material of an exciting winding is reduced, and the cost of the motor is reduced.
Pole pair number P of armature windingaNumber of slots N of inner stator or outer statorsThe number N of salient pole blocks of the rotorrSatisfies the following conditions:
when the number of slots of the stator is determined, the number of pole pairs of the armature winding can be changed by changing the number of salient pole blocks of the rotor. The armature winding can be an integer slot distribution winding or a fractional slot concentrated winding according to the size of the armature pole pair number.
In the stator tooth part, the direction of the magnetic steel magnetic field 8 is opposite to the direction of the excitation winding magnetic field 7, and meanwhile, the magnetic steel magnetic field 8 is closed along the stator tooth without penetrating through a radial air gap. In fig. 2, there are two pieces of magnetic steel in the stator teeth, which are top magnetic steel and bottom magnetic steel, respectively. The top magnetic steel and the bottom magnetic steel respectively weaken the saturation of the top and the bottom areas of the stator teeth, so that the torque density of the motor is effectively improved.
It should be noted that offshore wind power generation can be used as the most typical application of the present invention, but the present invention is not limited to the field of offshore wind power generation.
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (6)
1. A desaturated superconducting switched flux motor, comprising:
the rotor iron core (1), the air gap and the stator iron core (2) are sequentially distributed from inside to outside along the radial direction;
further comprising: the low-temperature permanent magnet synchronous motor comprises an armature winding (4) placed in a stator core slot, an excitation winding (5) placed in the middle of a stator core tooth, magnetic steels (3) respectively placed at the top and the bottom of the stator core tooth, and a cryostat (6) used for wrapping the excitation winding (5);
the rotor core (1) and the stator core (2) are made of ferromagnetic materials; and a magnetic steel magnetic field (8) generated by the magnetic steel (3) and an excitation magnetic field (7) generated by the excitation winding (5) are mutually offset at the teeth of the stator core, and the magnetic steel magnetic field (8) is closed along the teeth of the stator core and does not penetrate through an air gap.
2. A desaturated superconducting switched flux electric machine according to claim 1, characterized in that the number of said field windings (5) is the same as the number of slots of said stator core (2).
3. The desaturated superconducting switching flux motor according to claim 1 or 2,
the excitation winding (5) is a superconducting excitation winding, and the armature winding (4) is a superconducting armature winding; or
The excitation winding (5) is a superconducting excitation winding, and the armature winding (4) is a copper armature winding; or
The excitation winding (5) is a copper excitation winding, and the armature winding (4) is a superconducting armature winding;
the excitation winding (5) adopts direct current excitation, and alternating current flows through the armature winding (4).
4. A desaturated superconducting switched flux machine according to claim 1, characterized in that said armature winding (4) is a concentrated winding or a distributed winding.
5. A desaturated superconducting switched flux electric machine according to claim 1, characterized in that said field winding (5) is a single layer winding or a double layer winding.
6. A desaturated superconducting switching flux machine according to claim 1, characterized in that the pole pair number P of said armature winding (4)aNumber of stator slots NsThe number N of salient pole blocks of the rotorrSatisfies the following conditions:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010739427.9A CN111917201B (en) | 2020-07-28 | 2020-07-28 | Desaturation superconducting switch flux linkage motor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010739427.9A CN111917201B (en) | 2020-07-28 | 2020-07-28 | Desaturation superconducting switch flux linkage motor |
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| CN111917201A CN111917201A (en) | 2020-11-10 |
| CN111917201B true CN111917201B (en) | 2021-11-02 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| RU2761864C1 (en) * | 2021-04-06 | 2021-12-13 | Федеральное государственное бюджетное учреждение науки Ордена Трудового Красного Знамени Институт химии силикатов им. И.В. Гребенщикова Российской академии наук (ИХС РАН) | Synchronous superconducting wind generator |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101552527A (en) * | 2009-05-14 | 2009-10-07 | 浙江大学 | A mixed excitation type switch magnetic linkage motor |
| CN106374644A (en) * | 2016-09-09 | 2017-02-01 | 中国石油大学(华东) | Novel static sealed high-temperature superconductive excitation magnetic flux switching motor |
| CN109802501A (en) * | 2019-02-19 | 2019-05-24 | 华中科技大学 | A kind of divided stator carnassial tooth flux switching motor |
| CN110518781A (en) * | 2019-08-08 | 2019-11-29 | 东南大学 | Modulate the screen method of armature-reaction in superconducting motor in a kind of bimorph transducer field |
| CN110546720A (en) * | 2017-05-19 | 2019-12-06 | 住友电气工业株式会社 | Superconducting wire, method for manufacturing superconducting wire, superconducting coil, superconducting magnet, and superconducting device |
-
2020
- 2020-07-28 CN CN202010739427.9A patent/CN111917201B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101552527A (en) * | 2009-05-14 | 2009-10-07 | 浙江大学 | A mixed excitation type switch magnetic linkage motor |
| CN106374644A (en) * | 2016-09-09 | 2017-02-01 | 中国石油大学(华东) | Novel static sealed high-temperature superconductive excitation magnetic flux switching motor |
| CN110546720A (en) * | 2017-05-19 | 2019-12-06 | 住友电气工业株式会社 | Superconducting wire, method for manufacturing superconducting wire, superconducting coil, superconducting magnet, and superconducting device |
| CN109802501A (en) * | 2019-02-19 | 2019-05-24 | 华中科技大学 | A kind of divided stator carnassial tooth flux switching motor |
| CN110518781A (en) * | 2019-08-08 | 2019-11-29 | 东南大学 | Modulate the screen method of armature-reaction in superconducting motor in a kind of bimorph transducer field |
Non-Patent Citations (1)
| Title |
|---|
| 基于有取向硅钢的轴向磁通开关磁阻电机;曲荣海 等;《基于有取向硅钢的轴向磁通开关磁阻电机》;20180930;第33卷(第17期);第4070-4077页 * |
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