CN115250049A - An Electric Excitation Transformer Inverter Based on Double Stator Axial Flux Motor Design - Google Patents
An Electric Excitation Transformer Inverter Based on Double Stator Axial Flux Motor Design Download PDFInfo
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- CN115250049A CN115250049A CN202210528937.0A CN202210528937A CN115250049A CN 115250049 A CN115250049 A CN 115250049A CN 202210528937 A CN202210528937 A CN 202210528937A CN 115250049 A CN115250049 A CN 115250049A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K47/00—Dynamo-electric converters
- H02K47/18—AC/AC converters
- H02K47/22—Single-armature frequency converters with or without phase-number conversion
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M5/00—Conversion of AC power input into AC power output, e.g. for change of voltage, for change of frequency, for change of number of phases
- H02M5/02—Conversion of AC power input into AC power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into DC
- H02M5/32—Conversion of AC power input into AC power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into DC by dynamic converters
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Abstract
The invention discloses an electric excitation variable voltage frequency converter designed based on a double-stator axial flux motor, wherein an input side stator comprises an input side stator core and an input side stator winding wound on the input side stator core; the rotor comprises an input side excitation coil, an input side rotor iron core, a magnetism isolating layer, an output side rotor iron core and an output side excitation coil, wherein the magnetism isolating layer is positioned between the input side rotor iron core and the output side rotor iron core, the input side excitation coil is wound on the input side rotor iron core, and the output side excitation coil is wound on the output side rotor iron core; the output side stator comprises an output side stator iron core and an output side stator winding wound on the output side stator iron core, and the frequency converter has the characteristics of high economy, high operation reliability and excellent performance.
Description
Technical Field
The invention belongs to the technical field of new energy and electric power engineering, and relates to an electric excitation variable voltage frequency converter designed based on a double-stator axial flux motor.
Background
The power grid is an important infrastructure related to national economy, and is an important platform for optimal configuration of power transmission carriers and energy resources. In recent years, particularly with the rapid development of clean energy and the popularization and application of power grid intelligent technology, a traditional power system rapidly presents new characteristics of high-proportion power electronics and high-proportion new energy power supply. Because the sequential energy and productivity of China are reversely distributed, and the energy production is far away from an electricity load center, in order to meet the ever-increasing electricity utilization requirement of the economic and social development, more urgent requirements are provided for strengthening the interconnection and flexible control of the power grid and improving the capability of the power grid for optimizing and configuring energy resources. The renewable energy power generating set is significantly different from a traditional synchronous generator and flexible alternating current and direct current power transmission and transformation and traditional power transmission and transformation, and needs the intervention of a frequency converter in the aspect of asynchronous interconnection among different frequency power grids, so that the dynamic behavior of the system is deeply changed, and the system stability (such as power angle stability, voltage stability and frequency stability) is significantly influenced.
At present, power grid frequency conversion is basically realized by using power electronic equipment, large-scale power electronic equipment is very expensive in manufacturing cost under the background of high-power application, a control circuit is required to be matched with a system for operation, and the system is complex and is easy to break down. The core technology is that a rotary transformer with three-phase windings is arranged on the sides of a stator and a rotor, and a direct current motor driving system ensures that an equivalent rotor magnetic field and a stator magnetic field are synchronous in a rotating space to adjust the phase difference of a rotor magnetic field and a stator magnetic field so as to change the direction and the size of active power transmitted by the variable frequency transformer. However, this device requires an additional dc motor to drive the rotor, and it is difficult to further improve the efficiency.
The high-power electromagnetic type electric energy conversion device has wide application space in China, but at present, the research on the aspect is less in China, a device with high economy, high operation reliability and excellent performance is not applied in the field of electric energy frequency conversion, and the technology is deeply researched and popularized and applied in due time.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides an electric excitation voltage converter designed based on a double-stator axial flux motor, which has the characteristics of high economy, high operation reliability and excellent performance.
In order to achieve the purpose, the electric excitation voltage converter designed based on the double-stator axial flux motor comprises an input side stator, a rotor and an output side stator, wherein the rotor is positioned between the input side stator and the output side stator; the input side stator comprises an input side stator core and an input side stator winding wound on the input side stator core; the rotor comprises an input side excitation coil, an input side rotor iron core, a magnetism isolating layer, an output side rotor iron core and an output side excitation coil, wherein the magnetism isolating layer is positioned between the input side rotor iron core and the output side rotor iron core, the input side excitation coil is wound on the input side rotor iron core, and the output side excitation coil is wound on the output side rotor iron core; the output side stator includes an output side stator core and an output side stator winding wound around the output side stator core.
The input side stator windings are arranged in three-phase p-antipodal arrangement.
When three-phase alternating current flows through the input side stator winding, p pairs of poles of rotating magnetomotive force are generated.
Under the condition that the original frequency is converted into N times of the frequency, the three-phase winding of the stator winding on the output side is arranged in Np opposite poles.
When three-phase alternating current flows through the output side stator winding, a rotational magnetomotive force of Np counter poles is generated.
The magnetic isolation layer is made of non-magnetic conducting materials, and the input side rotor core is connected with the output side rotor core and isolates magnetic fields on two sides.
The pole pair number of the input side magnet exciting coil on the rotor is p.
And the number of pole pairs of the exciting coil on the output side of the rotor is Np.
A short-circuit coil is mounted on the input side rotor core.
And sensors are arranged in the input side stator, the output side stator and the rotor.
The invention has the following beneficial effects:
when the electric excitation variable-voltage frequency converter designed based on the double-stator axial flux motor is operated specifically, the input side stator comprises an input side stator core and an input side stator winding wound on the input side stator core; the rotor comprises an input side excitation coil, an input side rotor core, a magnetism isolating layer, an output side rotor core and an output side excitation coil; the output side stator comprises an output side stator iron core and an output side stator winding wound on the output side stator iron core, and in actual operation, the conversion of the frequency and the voltage of the transmitted electric energy is realized by changing the number of pole pairs of the input side stator winding, the number of pole pairs of the input side magnet exciting coil, the number of pole pairs of the output side stator winding and the number of pole pairs of the output side magnet exciting coil so as to change the multiple of frequency conversion.
Drawings
FIG. 1 is an oblique view of the present invention;
fig. 2 is an air gap direction view of the input side stator 1;
fig. 3 is an oblique view of the input-side rotor 2;
fig. 4 is an air gap direction view of the output side stator 3;
FIG. 5 is a circuit diagram illustrating the operation of the present invention;
fig. 6 is a graph of input and output voltage waveforms of the present invention.
Here, 1 is an input side stator, 2 is a rotor, 3 is an output side stator, 4 is an input side stator core, 5 is an input side stator winding, 6 is an input side field coil, 7 is an input side rotor core, 8 is a magnetic shield layer, 9 is an output side rotor core, 10 is an output side field coil, 11 is an output side stator core, and 12 is an output side stator winding.
Detailed Description
In order to make the technical solutions of the present invention better understood, 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, not all of the embodiments, and are not intended to limit the scope of the present disclosure. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present disclosure. 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.
There is shown in the drawings a schematic block diagram of a disclosed embodiment in accordance with the invention. The figures are not drawn to scale, wherein certain details are exaggerated and some details may be omitted for clarity of presentation. The shapes of the various regions, layers and their relative sizes, positional relationships are shown in the drawings as examples only, and in practice deviations due to manufacturing tolerances or technical limitations are possible, and a person skilled in the art may additionally design regions/layers with different shapes, sizes, relative positions, according to the actual needs.
Referring to fig. 1, the electric excitation voltage converter designed based on the double-stator axial flux motor according to the present invention includes an input-side stator 1, a rotor 2, and an output-side stator 3, where the rotor 2 is located between the input-side stator 1 and the output-side stator 3;
referring to fig. 2, the input side stator 1 includes an input side stator core 4 and an input side stator winding 5 wound around the input side stator core 4;
referring to fig. 3, the rotor 2 includes an input side field coil 6, an input side rotor core 7, a magnetic shield layer 8, an output side rotor core 9, and an output side field coil 10; wherein, the magnetic isolation layer 8 is positioned between the input side rotor core 7 and the output side rotor core 9, the input side excitation coil 6 is wound on the input side rotor core 7, and the output side excitation coil 10 is wound on the output side rotor core 9;
referring to fig. 4, the output side stator 3 includes an output side stator core 11 and an output side stator winding 12 wound around the output side stator core 11.
In order to realize N times of frequency conversion, the invention is divided into an input side and an output side by a magnetism isolating layer 8, a stator winding 5 on the input side of p opposite poles generates rotating magnetomotive force, the starting mode is not limited, a short-circuit coil or external dragging auxiliary starting can be used, a rotor 2 synchronously rotates under the action of an excitation coil of p opposite poles, and the synchronous rotating speed is as follows:
where f is the input-side frequency, and p is the number of pole pairs of the input-side field coil 6 and the input-side stator winding 5.
The input side and the output side share one rotor 2, the number of pole pairs of the output side excitation coil 10 is Np, a rotating magnetic field with Np opposite poles is generated in an output side air gap at the synchronous rotating speed, and N-frequency-doubled symmetrical three-phase alternating-current voltage can be induced in the output side stator winding 12 corresponding to the Np opposite poles of the outer stator winding, so that the conversion of the electric energy frequency from the input side to the output side is realized.
Example one
In the embodiment, the input side stator winding 5 is an input end, and a 4-pole 12-slot integral-pitch centralized winding design is adopted; the stator winding 12 on the output side is an output end, a 12-pole 18-slot fractional-slot centralized winding design is adopted, and the relation of 3 times among pole pairs is met. It should be understood that the stator pole slot mating and winding design is not limited to the specific design of the present example, as long as the pole pair number requirements and design goals are met. In the rotor 2, the number of poles of the output side field coil 10 is 12, and the number of pairs of input side poles is 4, which satisfy a triple relationship. The synchronous speed is 500rpm, and the frequency conversion multiple can be changed by changing the number of pole pairs of the input side stator winding 5, the number of pole pairs of the input side excitation coil 6, the number of pole pairs of the output side stator winding 12 and the number of pole pairs of the output side excitation coil 10.
Fig. 5 is a working circuit diagram of the invention, and the voltage converter comprises an input end three-phase winding and an output end three-phase winding, wherein the input end three-phase winding and the output end three-phase winding are in star connection. The three-phase winding of the input end is respectively connected with a three-phase alternating current voltage source, and the common point of the three-phase alternating current voltage sources is grounded; in order to reduce the sinusoidal distortion rate of the output voltage and current, passive filtering measures are adopted in the embodiment, the stator winding 12 on the output side is connected with a filtering resistor and then connected with a three-phase load resistor, a filter is connected in parallel with the load resistor, and the load resistor is connected to a common point of the ground.
The invention is applied to a power system adopting frequency division power transmission by utilizing finite element simulation software, a voltage conversion effect graph of the operation simulation of the variable voltage frequency converter is shown in figure 6, the voltage frequency of an input end is 16.667Hz, the voltage frequency of an output end is 50Hz through the variable voltage frequency converter, the electric energy conversion of triple frequency is realized, and the amplitude of voltage can be changed.
The rotor 2 in the invention adopts the magnetism isolating layer 8 to separate the magnetic field, realizes the function of frequency conversion according to the principle that the number of pole pairs of the input side and the output side is different and the synchronous rotating speed is the same, can realize the conversion of the frequency and the voltage amplitude of an electric signal according to the actual requirement, can add a short circuit coil or be started by external assistance to the rotor 2, can be completely separated from a power electronic device, and realizes the function of frequency conversion; the input side and the output side share one rotor 2, and the space utilization rate is high. Furthermore, the invention has mature technology, high reliability in engineering, very low technical cost and better economy. Furthermore, the invention is applied to the power system, can alleviate the trend of high-power electronic equipment of a new generation power system, and improves the stability of the power system.
The above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting the same, and after reading the present application, those skilled in the art will make various modifications or alterations of the present invention with reference to the above embodiments within the scope of the claims of the present patent application.
Claims (10)
1. An electric excitation voltage converter designed based on a double-stator axial flux motor is characterized by comprising an input side stator (1), a rotor (2) and an output side stator (3), wherein the rotor (2) is positioned between the input side stator (1) and the output side stator (3); the input side stator (1) comprises an input side stator core (4) and an input side stator winding (5) wound on the input side stator core (4); the rotor (2) comprises an input side excitation coil (6), an input side rotor core (7), a magnetic isolation layer (8), an output side rotor core (9) and an output side excitation coil (10), wherein the magnetic isolation layer (8) is positioned between the input side rotor core (7) and the output side rotor core (9), the input side excitation coil (6) is wound on the input side rotor core (7), and the output side excitation coil (10) is wound on the output side rotor core (9); the output-side stator (3) includes an output-side stator core (11) and an output-side stator winding (12) wound around the output-side stator core (11).
2. The electric excitation voltage converter designed based on the double-stator axial flux motor according to claim 1, wherein the input side stator winding (5) is arranged in three-phase p-antipodal arrangement.
3. The electric excitation variable voltage frequency converter designed based on the double-stator axial flux motor according to claim 2, wherein when three-phase alternating current flows through the input-side stator winding (5), a rotating magnetomotive force of p pairs of poles is generated.
4. The electric excitation voltage converter designed based on the double stator axial flux motor according to claim 3, wherein the three-phase winding of the output side stator winding (12) is in an Np antipodal arrangement under the condition that the original frequency is converted to an N-fold frequency.
5. The electric excitation voltage converter designed based on the double-stator axial flux motor according to claim 4, wherein the output side stator winding (12) generates a rotating magnetomotive force of Np pairs of poles when a three-phase alternating current flows.
6. The electric excitation voltage converter designed based on the double-stator axial-flux motor according to claim 1, wherein the magnetic shield layer (8) is made of a non-magnetic conductive material, and the input-side rotor core (7) is coupled to the output-side rotor core (9) and isolates the magnetic fields on both sides.
7. An electrically excited variable-voltage frequency converter designed on the basis of a double-stator axial-flux machine according to claim 4, characterized in that the number of pole pairs of the input-side field coil (6) on the rotor (2) is p.
8. The electrical excitation voltage converter designed based on the double stator axial flux motor according to claim 4, wherein the number of pole pairs of the output side field coil (10) on the rotor (2) is Np.
9. The electric excitation voltage converter designed based on the double-stator axial flux motor according to claim 1, wherein a short-circuit coil is mounted on the input side rotor core (7).
10. The electric excitation voltage converter designed based on the double-stator axial flux motor according to claim 1, wherein sensors are installed in the input side stator (1), the output side stator (3) and the rotor (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210528937.0A CN115250049A (en) | 2022-05-16 | 2022-05-16 | An Electric Excitation Transformer Inverter Based on Double Stator Axial Flux Motor Design |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210528937.0A CN115250049A (en) | 2022-05-16 | 2022-05-16 | An Electric Excitation Transformer Inverter Based on Double Stator Axial Flux Motor Design |
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| Publication Number | Publication Date |
|---|---|
| CN115250049A true CN115250049A (en) | 2022-10-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210528937.0A Pending CN115250049A (en) | 2022-05-16 | 2022-05-16 | An Electric Excitation Transformer Inverter Based on Double Stator Axial Flux Motor Design |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2025247977A1 (en) * | 2024-05-31 | 2025-12-04 | Yeesma | Axial-flux machine comprising a wound one-piece rotor body |
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| CN1753284A (en) * | 2005-09-20 | 2006-03-29 | 沈阳工业大学 | A dual-stator, single-rotor disc-type brushless double-fed AC motor |
| US20070013262A1 (en) * | 2005-07-15 | 2007-01-18 | Denso Corporation | Vehicle-use tandem electric rotating machine |
| CN104300755A (en) * | 2014-09-11 | 2015-01-21 | 东南大学 | Double-layer winding rotor type double-stator brushless double-fed motor |
| JP2016077052A (en) * | 2014-10-03 | 2016-05-12 | トヨタ自動車株式会社 | Magnetless rotating electrical machine and rotating electrical machine control system |
| CN106233578A (en) * | 2013-12-11 | 2016-12-14 | 株式会社达耐时 | Axial gap motor |
| CN110545026A (en) * | 2019-09-20 | 2019-12-06 | 哈尔滨工业大学 | stator excitation flywheel pulse induction generator system |
| CN114123712A (en) * | 2021-11-23 | 2022-03-01 | 西安交通大学 | Voltage converter based on double-stator electric excitation synchronous motor design |
-
2022
- 2022-05-16 CN CN202210528937.0A patent/CN115250049A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20070013262A1 (en) * | 2005-07-15 | 2007-01-18 | Denso Corporation | Vehicle-use tandem electric rotating machine |
| CN1753284A (en) * | 2005-09-20 | 2006-03-29 | 沈阳工业大学 | A dual-stator, single-rotor disc-type brushless double-fed AC motor |
| CN106233578A (en) * | 2013-12-11 | 2016-12-14 | 株式会社达耐时 | Axial gap motor |
| CN104300755A (en) * | 2014-09-11 | 2015-01-21 | 东南大学 | Double-layer winding rotor type double-stator brushless double-fed motor |
| JP2016077052A (en) * | 2014-10-03 | 2016-05-12 | トヨタ自動車株式会社 | Magnetless rotating electrical machine and rotating electrical machine control system |
| CN110545026A (en) * | 2019-09-20 | 2019-12-06 | 哈尔滨工业大学 | stator excitation flywheel pulse induction generator system |
| CN114123712A (en) * | 2021-11-23 | 2022-03-01 | 西安交通大学 | Voltage converter based on double-stator electric excitation synchronous motor design |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2025247977A1 (en) * | 2024-05-31 | 2025-12-04 | Yeesma | Axial-flux machine comprising a wound one-piece rotor body |
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