CN114696536A - Turbine direct-drive conical rotor permanent magnet synchronous generator set - Google Patents
Turbine direct-drive conical rotor permanent magnet synchronous generator set Download PDFInfo
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- CN114696536A CN114696536A CN202210380516.8A CN202210380516A CN114696536A CN 114696536 A CN114696536 A CN 114696536A CN 202210380516 A CN202210380516 A CN 202210380516A CN 114696536 A CN114696536 A CN 114696536A
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- turbine
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- permanent magnet
- conical rotor
- generator set
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- 230000001360 synchronised effect Effects 0.000 title claims abstract description 15
- 238000004804 winding Methods 0.000 claims abstract description 15
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 4
- 238000000034 method Methods 0.000 abstract description 6
- 230000008569 process Effects 0.000 abstract description 6
- 238000012423 maintenance Methods 0.000 abstract description 4
- 230000007774 longterm Effects 0.000 abstract description 2
- 230000003068 static effect Effects 0.000 abstract description 2
- 238000006073 displacement reaction Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 5
- 238000010248 power generation Methods 0.000 description 5
- 230000008859 change Effects 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 239000002918 waste heat Substances 0.000 description 3
- 230000004907 flux Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 230000007847 structural defect Effects 0.000 description 1
- 238000010977 unit operation Methods 0.000 description 1
Images
Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
- H02K7/18—Structural association of electric generators with mechanical driving motors, e.g. with turbines
- H02K7/1807—Rotary generators
- H02K7/1823—Rotary generators structurally associated with turbines or similar engines
-
- 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
- H02K1/27—Rotor cores with permanent magnets
- H02K1/2706—Inner rotors
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K21/00—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets
- H02K21/12—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets
- H02K21/14—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets with magnets rotating within the armatures
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
Abstract
The invention discloses a turbine direct-drive conical rotor permanent magnet synchronous generator set, which comprises a shell, a turbine, a rotating shaft, a conical rotor and a stator core with a winding, wherein the conical rotor and the turbine are respectively fixedly sleeved on the outer side of the rotating shaft; the unit keeps axial balance by means of the self magnetic tension of the motor, and the traditional structures such as a spring, a bearing and the like are omitted; the working efficiency is improved, the rotor shaft and the turbine are kept relatively static, no mechanical friction loss exists in the operation process, and compared with the traditional bearing structure, the energy loss is reduced, the operation efficiency is improved, the service life is long, and the maintenance cost is low; after the scheme of the invention is adopted, the motor can keep long-term operation, and the service life of the motor is the service life of the motor.
Description
Technical Field
The invention relates to the technical field of waste heat power generation, in particular to a turbine direct-drive conical rotor permanent magnet synchronous generator set.
Background
The turbine direct-drive permanent magnet generator set is widely applied to a waste heat power generation system. The turbine rotating at high speed drives the coaxial generator to rotate to generate electricity. The axial force generated by the turbine rotating at high speed needs to be restrained by adding a spring and a bearing, so that the structure of the generator set is complicated, and the generating efficiency is reduced.
In order to realize high-speed, efficient and stable operation of the waste heat generator set, increase the service life of the generator set and reduce the maintenance cost, a turbine direct-drive conical rotor permanent magnet synchronous generator set is needed to be designed to solve the problems.
Disclosure of Invention
The invention aims to provide a turbine direct-drive conical rotor permanent magnet synchronous generator set to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme:
the utility model provides a turbine directly drives toper rotor permanent magnet synchronous generator set, includes casing, turbine, pivot, toper rotor and has the stator core of winding, the fixed cover is equipped with toper rotor and turbine respectively in the pivot outside, the cover is equipped with the stator core that has the winding outside the motor toper rotor, the stator core that has the winding is fixed to be inlayed and is established at the casing inner wall.
As a further scheme of the invention: the turbine is used to generate axial force.
As a still further scheme of the invention: the front end cover is fixedly installed at one end of the shell, and the rear end cover is fixedly installed at the other end of the shell.
As a still further scheme of the invention: and two ends of the rotating shaft are respectively and rotatably arranged on the front end cover and the rear end cover.
As a still further scheme of the invention: the inner circle of the stator core with the winding and the outer circle of the conical rotor core are in a conical structure.
As a still further scheme of the invention: the conical rotor bears radial force and electromagnetic axial force, and axial displacement is generated by the conical rotor, so that the air gap flux density is changed due to the change of the air gap length.
Compared with the prior art, the invention has the beneficial effects that:
1. the mechanical connection structure is simple;
the unit keeps axial balance by means of the self magnetic tension of the motor, and the traditional structures such as a spring, a bearing and the like are omitted.
2. The working efficiency is improved;
rotor, rotor shaft and turbine three keep static relatively, do not have mechanical friction loss in the operation process, compare with traditional bearing structure, have reduced energy loss, and operating efficiency can promote.
3. The service life is long, and the maintenance cost is low;
mechanical connecting devices such as bearings and the like need to be maintained regularly, the service life of the mechanical connecting devices is usually shorter than that of a generator set, and the motor can keep long-term operation after the scheme of the invention is adopted, and the service life of the mechanical connecting devices is the service life of the motor.
4. The working principle of the turbine direct-drive conical rotor permanent magnet synchronous generator set is the same as that of the traditional turbine direct-drive permanent magnet generator set, but because the rotor of the generator is conical, the generator can generate an axial magnetic tension force pointing to the small end of the rotor from the large end of the rotor, the axial force can be reasonably utilized to balance the axial force with the turbine which is coaxially connected, so that additional balance devices such as springs and bearings are omitted, and the effects of simplifying a motor connecting structure, improving the power generation efficiency of a lifting machine set, prolonging the service life of the generator set and reducing the maintenance cost of the system are further realized.
Drawings
Fig. 1 is a schematic structural diagram of a turbine direct-drive conical rotor permanent magnet synchronous generator set.
Fig. 2 is a schematic diagram of the stress of the rotor of the conical asynchronous motor.
Fig. 3 is a diagram of a conventional cylindrical rotor permanent magnet turbine generator.
Figure 4 is a diagram of a tapered rotor permanent magnet turbine generator.
Fig. 5 is a turbine generator diagram.
Shown in the figure: the turbine comprises a shell 1, a front end cover 2, a turbine 3, a rear end cover 4, a rotating shaft 5, a conical rotor 6 and a stator iron core 7 with windings.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1 to 5, in an embodiment of the present invention, a turbine direct-drive tapered rotor permanent magnet synchronous generator set includes a casing 1, a front end cover 2, a turbine 3, a rear end cover 4, a rotating shaft 5, a tapered rotor 6, and a stator core 7 with a winding, where the tapered rotor 6 and the turbine 3 are respectively fixedly sleeved on the outer side of the rotating shaft 5, the stator core 7 with the winding is sleeved on the outer side of the tapered rotor 6 of the motor, the stator core 7 with the winding is fixedly embedded in the inner wall of the casing 1, the front end cover 2 is fixedly installed at one end of the casing 1, the rear end cover 4 is fixedly installed at the other end of the casing 1, and two ends of the rotating shaft 5 are respectively rotatably installed on the front end cover 2 and the rear end cover 4.
The conical rotor permanent magnet synchronous generator has certain difference with a traditional cylindrical motor in structure, as shown in fig. 2, the difference is that the inner circle of a stator core and the outer circle of a rotor core are in a conical structure, a conical rotor of the conical rotor bears radial force and electromagnetic axial force at the same time, the rotor can also generate axial displacement, and the change of the air gap length leads to the change of air gap magnetic density, so that the motor has the air gap magnetic field regulation characteristic.
The working principle of the invention is as follows:
when the turbine works, a radial inlet of the turbine can spray high-temperature and high-pressure working media, meanwhile, exhaust gas after high-speed rotation in the volute is discharged from the axial direction of the turbine, conversion from heat energy to mechanical energy is achieved, then the high-speed turbine direct-drive generator rotates to output electric energy outwards, and conversion from mechanical energy to electric energy is achieved.
Because the pressure of working medium before and after working is different greatly, a certain pressure difference (i.e. expansion rate) can be formed, so that unbalanced pressure can be formed at inlet end and outlet end of turbine impeller so as to produce axial force (F)tur,-z) See fig. 5 for details.
The axial force is not generated due to external factors, and belongs to an inherent characteristic of the turbine 3, for a turbine power generation rotor, in order to balance the axial force, a measure of an axial force balancing device needs to be additionally arranged, if corresponding balancing measures or structural defects are not adopted, the rotor of a turbine direct-drive generator rotating at a high speed can generate axial movement, the turbine and a volute are rubbed with each other, particularly under the condition of non-periodic working condition operation, the unit operation state is unstable, a turbine and a generator are damaged, and the operation period and the reliability of a power generation system are greatly reduced.
In the process of designing and manufacturing the conical permanent magnet generator or in the process of analyzing and optimizing the conical permanent magnet generator, comprehensive consideration and analysis on structural parameters of the motor, the operation characteristics of the turbine and the like are required.
When the motor runs in no-load operation, the stator winding is in a power-off state, and the rotor can bear the axial component acting force in the air gap magnetic field and generate no-load electromagnetic axial force (F) due to the existence of the permanent magnetgen,z0) The stator and rotor iron cores are staggered by a certain displacement (delta z), and the electromagnetic axial force is adjusted to balance the axial force generated by the turbine; when the generator is in load operation, the stator winding is electrified, and under the armature reaction, the conical rotor 6 generates a load electromagnetic axial force (F) larger than that in no-load operationgen,z) Therefore, by adjusting the armature magnetic potential or the coupling area of the conical rotor 6 and the stator core, the axial force and the generator electromagnetic axial force reach a self-balancing state in the axial direction.
In the operation process of the conical generator, compared with a common cylindrical rotor motor, the conical rotor permanent magnet motor can automatically generate electromagnetic axial force and axial displacement, the maximum difference between the electromagnetic axial force and the axial displacement is the point, the size of the cone angle directly influences the size of the electromagnetic axial force, and the electromagnetic axial force points from the end with the large rotor outer diameter to the end with the small rotor outer diameter. When the axial displacement of the rotor is greatly changed, the length of an air gap between the stator and the rotor and the axial overlapping length are seriously influenced, and further the electromagnetic axial force, the air gap flux density of the motor and the like are greatly changed. Therefore, in the process of designing and determining a series of parameters such as a taper angle, an axial displacement distance and the like of the generator and a d-q axis current control scheme, comprehensive consideration needs to be given to various factors, the electromagnetic axial force of the tapered rotor and the axial force generated by the turbine can be kept in the states of equal magnitude and opposite directions in real time, the final purpose of self-adaptive balance of the axial force of the rotor can be achieved, and the output performance of the generator can be improved.
Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that various changes in the embodiments and/or modifications of the invention can be made, and equivalents and modifications of some features of the invention can be made without departing from the spirit and scope of the invention.
Claims (4)
1. The utility model provides a turbine directly drives toper rotor permanent magnet synchronous generator set, includes casing (1), turbine (3), pivot (5), toper rotor (6) and stator core (7) that have the winding, its characterized in that: the outer side of the rotating shaft (5) is respectively and fixedly provided with a conical rotor (6) and a turbine (3), the outer side of the motor conical rotor (6) is provided with a stator core (7) with a winding in a sleeved mode, and the stator core (7) with the winding is fixedly embedded in the inner wall of the shell (1).
2. The turbine direct-drive conical rotor permanent magnet synchronous generator set of claim 1, characterized in that: and two ends of the rotating shaft (5) are respectively and rotatably arranged on the front end cover (2) and the rear end cover (4).
3. The turbine direct-drive conical rotor permanent magnet synchronous generator set of claim 1, characterized in that: the inner circle of the stator iron core (7) with the winding and the outer circle of the iron core of the conical rotor (6) are in a conical structure.
4. The turbine direct-drive conical rotor permanent magnet synchronous generator set of claim 1, characterized in that: the conical rotor (6) is subjected to radial and electromagnetic axial forces.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210380516.8A CN114696536A (en) | 2022-04-12 | 2022-04-12 | Turbine direct-drive conical rotor permanent magnet synchronous generator set |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210380516.8A CN114696536A (en) | 2022-04-12 | 2022-04-12 | Turbine direct-drive conical rotor permanent magnet synchronous generator set |
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| Publication Number | Publication Date |
|---|---|
| CN114696536A true CN114696536A (en) | 2022-07-01 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210380516.8A Pending CN114696536A (en) | 2022-04-12 | 2022-04-12 | Turbine direct-drive conical rotor permanent magnet synchronous generator set |
Country Status (1)
| Country | Link |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203784421U (en) * | 2014-04-02 | 2014-08-20 | 西安交通大学 | Flow valve direct-driven by taper permanent magnet synchronous motor |
| CN106801632A (en) * | 2015-11-25 | 2017-06-06 | 湖南大学 | A kind of afterheat generating system with cone rotor generator |
| CN107060909A (en) * | 2016-12-17 | 2017-08-18 | 潍坊真率节能科技有限公司 | A kind of turbomachinery with new thrust bearing |
| CN108696016A (en) * | 2018-05-29 | 2018-10-23 | 杭州精导智能科技有限公司 | Direct driving motor |
| CN213783109U (en) * | 2020-12-22 | 2021-07-23 | 中国科学院宁波材料技术与工程研究所 | Permanent magnet conical propulsion motor and aircraft |
-
2022
- 2022-04-12 CN CN202210380516.8A patent/CN114696536A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203784421U (en) * | 2014-04-02 | 2014-08-20 | 西安交通大学 | Flow valve direct-driven by taper permanent magnet synchronous motor |
| CN106801632A (en) * | 2015-11-25 | 2017-06-06 | 湖南大学 | A kind of afterheat generating system with cone rotor generator |
| CN107060909A (en) * | 2016-12-17 | 2017-08-18 | 潍坊真率节能科技有限公司 | A kind of turbomachinery with new thrust bearing |
| CN108696016A (en) * | 2018-05-29 | 2018-10-23 | 杭州精导智能科技有限公司 | Direct driving motor |
| CN213783109U (en) * | 2020-12-22 | 2021-07-23 | 中国科学院宁波材料技术与工程研究所 | Permanent magnet conical propulsion motor and aircraft |
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