CN114123711B - Surface-mounted permanent magnet variable voltage frequency converter based on magnetic field modulation principle and design method - Google Patents

Surface-mounted permanent magnet variable voltage frequency converter based on magnetic field modulation principle and design method Download PDF

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CN114123711B
CN114123711B CN202111397763.0A CN202111397763A CN114123711B CN 114123711 B CN114123711 B CN 114123711B CN 202111397763 A CN202111397763 A CN 202111397763A CN 114123711 B CN114123711 B CN 114123711B
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stator winding
permanent magnet
magnetic field
mounted permanent
inner stator
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CN114123711A (en
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王曙鸿
骆力州
寇可焓
段娜娜
张那明
张军
王锡凡
王秀丽
张寅捷
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Xian Jiaotong University
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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
    • 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
    • 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
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K15/00—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K16/00—Machines with more than one rotor or stator
    • H02K16/04—Machines with one rotor and two stators
    • 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
    • H02M1/00—Details of apparatus for conversion
    • H02M1/12—Arrangements for reducing harmonics from ac input or output
    • 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
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K19/00—Synchronous motors or generators
    • H02K19/02—Synchronous motors
    • H02K19/14—Synchronous motors having additional short-circuited windings for starting as asynchronous motors
    • 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

Abstract

The invention discloses a surface-mounted permanent magnet variable voltage frequency converter based on a magnetic field modulation principle and a design method thereof, wherein the surface-mounted permanent magnet variable voltage frequency converter comprises the following steps: the transformer and the design method thereof can realize electric energy frequency conversion and have the characteristics of high economy, high operation reliability and excellent performance.

Description

Surface-mounted permanent magnet variable voltage frequency converter based on magnetic field modulation principle and design method
Technical Field
The invention belongs to the technical field of new energy and electric power engineering, and particularly relates to a surface-mounted permanent magnet variable-voltage frequency converter based on a magnetic field modulation principle and a design method thereof.
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, especially with the rapid development of clean energy and the popularization and application of power grid intelligent technology, traditional power systems are rapidly showing new characteristics of high-proportion power electronics and high-proportion new energy power sources. 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 application background of high power, 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 variable voltage frequency converter 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 the rotor magnetic field compared with the stator magnetic field, so that the direction and the size of active power transmitted by the variable frequency transformer are changed. 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 a surface-mounted permanent magnet variable-voltage frequency converter based on a magnetic field modulation principle and a design method thereof.
In order to achieve the above purpose, the design method of the surface-mounted permanent magnet voltage converter based on the magnetic field modulation principle of the invention comprises the following steps:
a rotary magnetic modulation ring is additionally arranged between the inner stator core and the outer stator core, a salient pole magnetic modulation block is arranged on the outer wall of the rotary magnetic modulation ring, and a surface-mounted permanent magnet is arranged on the inner wall of the rotary magnetic modulation ring;
the rotating magnetomotive force generated by the inner stator winding with p pairs of poles is modulated into a rotating magnetic field with np pairs of poles by the rotating modulating magnetic ring, the rotating magnetomotive force generated by the inner stator winding corresponds to np pairs of poles of the outer stator winding, the rotating magnetomotive force generated by the inner stator winding and the modulated three-phase rotating magnetic field rotate at synchronous rotating speed, and the modulated rotating magnetic field induces n-frequency-doubled symmetrical three-phase alternating-current voltage in the outer stator winding.
The invention relates to a surface-mounted permanent magnet variable voltage frequency converter based on a magnetic field modulation principle, which comprises an outer stator core, an outer stator winding, a rotary magnetic adjusting ring, an inner stator core and an inner stator winding, wherein the outer stator core is arranged on the outer stator winding;
the inner stator iron core, the rotary adjusting magnetic ring and the outer stator iron core are sequentially distributed from inside to outside, an inner stator winding is wound on the inner stator iron core, an outer stator winding is wound in the outer stator iron core, a salient pole adjusting magnetic block is arranged on the outer wall of the rotary adjusting magnetic ring, and a surface-mounted permanent magnet is arranged on the inner wall of the rotary adjusting magnetic ring.
The number of the salient pole magnetic adjusting blocks is the sum of the number of pole pairs of the outer stator winding and the number of pole pairs of the inner stator winding.
The pole pair number of the surface-mounted permanent magnet is the same as that of the inner stator winding.
Angular velocity ω of modulated three-phase rotating magnetic field w Angular velocity omega of rotary magnetic regulating ring s And the angular velocity omega of the rotating magnetic field generated by the inner stator winding n The following relation is satisfied:
ω w ＝ω n ＝ω s 。
a starting cage is arranged between the surface-mounted permanent magnet and the inner wall of the rotary magnetic adjusting ring.
The outer stator winding is connected with a three-phase filter circuit.
The number of pole pairs of the inner stator winding is 2; the number of pole pairs of the outer stator winding is 6, the number of the salient pole magnet adjusting blocks is 8, and the number of pole pairs of the surface-mounted permanent magnet is 2.
The invention has the following beneficial effects:
the surface-mounted permanent magnet variable-voltage frequency converter based on the magnetic field modulation principle and the design method thereof are characterized in that when the frequency converter is operated specifically, a rotary magnetic modulation ring is additionally arranged between an inner stator core and an outer stator core, the rotary magnetic electromotive force generated by an inner stator winding with p opposite poles is modulated into a rotary magnetic field with np opposite poles by the rotary magnetic modulation ring, the rotary magnetic electromotive force generated by the inner stator winding and the modulated three-phase rotary magnetic field rotate at synchronous speed, and n-fold symmetric three-phase alternating current voltage is induced in the outer stator winding by the modulated rotary magnetic field to realize n-fold frequency conversion. Finally, the invention can realize the conversion of the frequency and the voltage of the transmitted electric energy, can completely separate from power electronic equipment to realize the frequency conversion, can ensure that the input and output power factor is more than 0.95 under the rated power, simultaneously ensures that the waveform distortion rate of the output voltage and the current meets the national standard requirement, has good stability, can be used in a plurality of severe working environments, and can be suitable for various fields such as frequency division transmission and the like.
Furthermore, the invention is provided with the starting cage, the self-starting of the rotary magnetic regulating ring can be realized by the aid of the starting cage, and then the synchronous speed is automatically transferred without the aid of a control circuit.
Further, a three-phase filter circuit is provided, which can filter out harmonic waves and reduce the waveform distortion rate of each phase voltage and line current, wherein the filter resistance is very small, and the reduction of the output voltage is hardly caused.
Drawings
FIG. 1 is a schematic design diagram of the present invention;
FIG. 2 is a schematic structural diagram according to a first embodiment;
FIG. 3 is a circuit diagram illustrating operation of the first embodiment;
FIG. 4 is a graph of input and output voltage waveforms for an embodiment.
Wherein, 1 is an outer stator iron core, 2 is an outer stator winding, 3 is a salient pole magnet adjusting block, 4 is a starting cage, 5 is a surface-mounted permanent magnet, 6 is an inner stator iron core, and 7 is an inner 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 design method of the surface-mounted permanent magnet variable voltage frequency converter based on the magnetic field modulation principle of the present invention comprises the following steps:
a rotary modulating ring is additionally arranged between an inner stator core 6 and an outer stator core 1, a salient pole modulating block 3 is arranged on the outer wall of the rotary modulating ring, and a surface-mounted permanent magnet 5 is arranged on the inner wall of the rotary modulating ring;
in order to realize n times of frequency conversion, the rotating magnetic motive force generated by the inner stator winding 7 with p opposite poles is modulated into a rotating magnetic field with np opposite poles by the rotating modulating magnetic ring, the rotating magnetic motive force generated by the inner stator winding 7 and the modulated three-phase rotating magnetic field rotate at synchronous speed, and the modulated rotating magnetic field induces n-fold frequency symmetrical three-phase alternating current voltage in the outer stator winding 2 and outputs the voltage.
When three-phase symmetrical current flows, the inner stator winding 7 generates rotating magnetomotive force, the number of pole pairs of the rotating magnetomotive force is related to the arrangement of the windings, and the spatial distribution F of the rotating magnetomotive force generated by the inner stator winding 7 is n (θ) is expressed as:
Figure BDA0003370628630000061
wherein i is the number of harmonics, F i Amplitude of the magnetomotive force being harmonic of corresponding order, p n Is the pole pair number, omega, of the inner stator winding 7 n Angular velocity, theta, of the rotating magnetomotive force generated by the inner stator winding 7 0 Is the angle of the initial position, theta is the spatial angle, and t is the time at that moment.
The distribution of the flux guide lambda (theta) of the rotary magnetic modulation ring in the space is represented as follows:
Figure BDA0003370628630000062
wherein j is the number of harmonics, Λ 0 Being a constant component in the flux-guide, Λ j Amplitude of harmonic magnetomotive force of corresponding orderThe value Z is the number of the salient pole magnetic adjusting blocks 3, omega s In order to rotate the angular velocity of the magnetic modulation ring, theta is a space angle, and t is time at the moment.
The modulated magnetic flux is F n (θ) multiplied by Λ (θ); modulated rotating magnetic field pole pair number p w (i.e., the number of pole pairs of the outer stator winding 2), the number of pole pairs p of the rotary magnetomotive force generated by the inner stator winding 7 n And the number Z of the salient pole magnet adjusting blocks 3 satisfies the following relational expression:
p w +p n ＝np+p＝(n+1)p＝Z
angular velocity ω of modulated three-phase rotating magnetic field w (i.e., angular velocity of the rotating magnetomotive force induced by the induced current in the outer stator winding 2), and angular velocity ω of the rotating field adjusting ring s And the angular velocity omega of the rotating magnetic field generated by the inner stator winding 7 n The following relation is satisfied:
Figure BDA0003370628630000063
in order to realize the purpose, the number Z of the salient pole magnet adjusting blocks 3 is (n + 1) p, and the angular velocity omega of the rotary magnet adjusting ring s The following relation is satisfied:
Figure BDA0003370628630000064
namely, it is
ω w ＝ω n ＝ω s
Further, in order to ensure that the angular speed of the rotary magnet adjusting ring meets the relation, the pole pair number of the surface-mounted permanent magnet 5 and the pole pair number of the inner stator winding 7 are the same, and the rotary magnet adjusting ring keeps synchronous rotating speed in stable operation.
Example one
Referring to fig. 2, the present embodiment exemplifies 3 times frequency conversion, and the surface-mounted permanent magnet voltage converter based on the magnetic field modulation principle includes an outer stator core 1, an outer stator winding 2, a rotation modulation magnetic ring, a starting cage 4, an inner stator core 6, and an inner stator winding 7.
The inner stator core 6, the rotary modulation magnetic ring and the outer stator core 1 are sequentially distributed from inside to outside, an inner stator winding 7 is wound on the inner stator core 6, an outer stator winding 2 is wound in the outer stator core 1, a salient pole modulation block 3 is arranged on the outer wall of the rotary modulation magnetic ring, a surface-mounted permanent magnet 5 is arranged on the inner wall of the rotary modulation magnetic ring, and a starting cage 4 is arranged between the surface-mounted permanent magnet 5 and the inner wall of the rotary modulation magnetic ring.
In the embodiment, the inner stator winding 7 is an input end, and the number of pole pairs is 2; the outer stator winding 2 is the output end, and the number of pole pairs is 6. The number of pole pairs satisfies 3 times, the number of the salient pole magnet adjusting blocks is 3, the number of the pole pairs of the surface-mounted permanent magnet 5 is 8, the number of the pole pairs is 2, the number of the pole pairs is the same as that of the pole pairs of the inner stator winding 7, the number relation of all parts satisfies the design principle, and the angular speed omega of the modulated three-phase rotating magnetic field w Angular velocity omega of rotary magnetic regulating ring s And the angular velocity omega of the rotating magnetic field generated by the inner stator winding 7 n The following relation is satisfied:
Figure BDA0003370628630000071
namely, it is
ω w ＝ω n ＝ω s
The embodiment can realize the conversion of the output end voltage frequency into the input end voltage frequency by 3 times, and the conversion of the voltage amplitude can be realized by changing the winding turns. Due to the fact that the starting cage is installed, asynchronous self-starting can be achieved, then synchronous speed rotation is achieved, participation of any control circuit is not needed in the process from starting to stable operation, the device is simple in structure, high in stability and reliability in the operation process, and the device can adapt to severe working environments.
Fig. 3 is a circuit for operating the voltage converter. In the circuit, the variable-voltage frequency converter comprises three-phase windings of an input end A, a B and a C and three-phase windings of an output end A, a B and a C, wherein the three-phase windings of the input end and the three-phase windings of the output end are in star connection. The three-phase winding of the input end is respectively connected with three-phase alternating current voltage sources A, B and C, and the common point of the three-phase alternating current voltage sources is grounded; the three-phase winding of the output end is connected with a filter resistor and then connected with a three-phase load resistor, a filter is connected in parallel on the load resistor, and the load resistor is connected to a common point of the ground.
The frequency of the three-phase alternating voltage source can be converted into n times by the voltage converter and then output to the load from the output end, for the first embodiment, the conversion of 3 times can be realized, the multiple of the frequency conversion can be changed by changing the number of pole pairs of the inner stator winding 7, the number of pole pairs of the outer stator winding 2 and the number of the salient pole magnet adjusting blocks 3, and simultaneously the number of pole pairs of the surface-mounted permanent magnets 5 is changed, so that synchronous rotation is realized.
The waveform distortion rate of the existing line voltage is small, but the phase voltage has certain waveform distortion, and the function of filtering phase voltage harmonic waves can be realized by matching a filter and a filter resistor in a circuit. The resistance of the filter resistor is selected to be far larger than the impedance of the filter branch circuit and far smaller than the resistance of the load resistor, so that the filtering effect can be ensured and the amplitude of the output voltage is not reduced.
Fig. 4 shows input and output voltage waveforms of the voltage converter, which are the input and output voltage waveforms of the voltage converter having the topology of fig. 2, as can be seen from fig. 4, the frequency of the output line voltage is 3 times of the frequency of the input line voltage, and the voltage converter realizes the function of 3 times frequency conversion and can change the amplitude of the voltage.
Finally, the invention adopts the rotary magnetic modulation ring to modulate the magnetic field, thereby realizing the function of frequency conversion, and the permanent magnet is arranged on the rotary magnetic modulation ring, thereby realizing the synchronous rotation of the rotary magnetic modulation ring. The frequency and voltage conversion can be realized without power electronic equipment, and the device only comprises components such as an iron core, a winding, a permanent magnet and the like, and has good economical efficiency. According to different frequency conversion and voltage conversion requirements, corresponding functions can be realized by changing the number of pole pairs and turns of the inner stator winding, the number of pole pairs and turns of the outer stator winding and the number of salient pole magnetic regulating blocks of the rotary magnetic regulating ring. The system has the function of self-starting, does not need the participation of a control circuit, and has a simpler system structure. The device has the advantages of high output power factor, small distortion rate of output voltage and current waveforms, no pollution to a power grid, high working reliability, stable operation and capability of adapting to a severe working environment.
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 invention.

Claims (8)

1. A surface-mounted permanent magnet voltage converter design method based on a magnetic field modulation principle is characterized by comprising the following steps:
a rotary magnetic modulation ring is additionally arranged between the inner stator core (6) and the outer stator core (1), a salient pole magnetic modulation block (3) is arranged on the outer wall of the rotary magnetic modulation ring, and a surface-mounted permanent magnet (5) is arranged on the inner wall of the rotary magnetic modulation ring;
the rotating magnetic motive force generated by the inner stator winding (7) with p pairs of poles is modulated into an np pair of poles rotating magnetic field by the rotating magnetic adjusting ring, the np pair of poles corresponds to the np pair of poles of the outer stator winding (2), the rotating magnetic motive force generated by the inner stator winding (7) and the modulated three-phase rotating magnetic field rotate at synchronous rotating speed, and the modulated rotating magnetic field induces n-frequency-doubled symmetrical three-phase alternating current voltage in the outer stator winding (2).
2. A surface-mounted permanent magnet variable voltage frequency converter based on a magnetic field modulation principle is characterized by comprising an outer stator iron core (1), an outer stator winding (2), a rotary magnetic adjusting ring, an inner stator iron core (6) and an inner stator winding (7);
the inner stator iron core (6), the rotary magnetic modulation ring and the outer stator iron core (1) are sequentially distributed from inside to outside, an inner stator winding (7) is wound on the inner stator iron core (6), an outer stator winding (2) is wound in the outer stator iron core (1), a salient pole magnetic modulation block (3) is arranged on the outer wall of the rotary magnetic modulation ring, a surface-mounted permanent magnet (5) is arranged on the inner wall of the rotary magnetic modulation ring, and the number of poles of the outer stator winding is n times of the number of poles of the inner stator winding.
3. The surface-mounted permanent magnet variable-voltage frequency converter based on the magnetic field modulation principle as claimed in claim 2, wherein the number of the salient pole magnetic modulation blocks (3) is the sum of the number of pole pairs of the outer stator winding (2) and the number of pole pairs of the inner stator winding (7).
4. The surface-mounted permanent magnet voltage converter based on the magnetic field modulation principle as claimed in claim 2, wherein the number of pole pairs of the surface-mounted permanent magnet (5) is the same as the number of pole pairs of the inner stator winding (7).
5. The surface-mounted permanent magnet voltage converter based on the magnetic field modulation principle as claimed in claim 2, wherein the angular velocity ω of the modulated three-phase rotating magnetic field is w Angular velocity omega of rotary magnetic regulating ring s And the angular velocity omega of the rotating magnetic field generated by the inner stator winding n The following relation is satisfied:
ω w ＝ω n ＝ω s 。
6. the surface-mounted permanent magnet variable voltage frequency converter based on the magnetic field modulation principle as claimed in claim 2, wherein a start cage (4) is arranged between the surface-mounted permanent magnet (5) and the inner wall of the rotary magnetic modulation ring.
7. The surface-mounted permanent magnet variable voltage frequency converter based on the magnetic field modulation principle according to claim 2, characterized in that the outer stator winding (2) is connected with a three-phase filter circuit.
8. The surface-mounted permanent magnet variable voltage frequency converter based on the magnetic field modulation principle according to claim 2, wherein the number of pole pairs of the inner stator winding (7) is 2; the number of the pole pairs of the outer stator winding (2) is 6, the number of the salient pole magnet adjusting blocks (3) is 8, and the number of the pole pairs of the surface-mounted permanent magnet (5) is 2.
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Publication number Priority date Publication date Assignee Title
CN202978667U (en) * 2012-12-13 2013-06-05 中国矿业大学 Variable-frequency transformer
CN111509938A (en) * 2020-03-24 2020-08-07 江苏大学 Multi-working-mode double-stator magnetic field modulation motor
CN211377853U (en) * 2019-11-08 2020-08-28 国家能源集团谏壁发电厂 Winding type permanent magnet coupling speed regulating motor

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GB2488129A (en) * 2011-02-16 2012-08-22 Rolls Royce Plc Modulated field electromagnetic machine

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN202978667U (en) * 2012-12-13 2013-06-05 中国矿业大学 Variable-frequency transformer
CN211377853U (en) * 2019-11-08 2020-08-28 国家能源集团谏壁发电厂 Winding type permanent magnet coupling speed regulating motor
CN111509938A (en) * 2020-03-24 2020-08-07 江苏大学 Multi-working-mode double-stator magnetic field modulation motor

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