CN112260478B - Short-stroke frequency-doubling single-phase reciprocating permanent magnet linear generator and power generation system - Google Patents
Short-stroke frequency-doubling single-phase reciprocating permanent magnet linear generator and power generation system Download PDFInfo
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- CN112260478B CN112260478B CN202011125477.4A CN202011125477A CN112260478B CN 112260478 B CN112260478 B CN 112260478B CN 202011125477 A CN202011125477 A CN 202011125477A CN 112260478 B CN112260478 B CN 112260478B
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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
- H02K7/1869—Linear generators; sectional generators
- H02K7/1876—Linear generators; sectional generators with reciprocating, linearly oscillating or vibrating parts
- H02K7/1884—Linear generators; sectional generators with reciprocating, linearly oscillating or vibrating parts structurally associated with free piston engines
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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
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K3/00—Details of windings
- H02K3/04—Windings characterised by the conductor shape, form or construction, e.g. with bar conductors
- H02K3/28—Layout of windings or of connections between windings
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K35/00—Generators with reciprocating, oscillating or vibrating coil system, magnet, armature or other part of the magnetic circuit
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K35/00—Generators with reciprocating, oscillating or vibrating coil system, magnet, armature or other part of the magnetic circuit
- H02K35/02—Generators with reciprocating, oscillating or vibrating coil system, magnet, armature or other part of the magnetic circuit with moving magnets and stationary coil systems
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Linear Motors (AREA)
Abstract
The invention belongs to the field of generator equipment, and provides a short-stroke frequency-doubling single-phase reciprocating permanent magnet linear generator and a power generation system. The short-stroke frequency-doubling single-phase reciprocating permanent magnet linear generator comprises a rotor; the stator is uniformly distributed with a plurality of stator teeth on the periphery; the pitch of the stator teeth is equal to the polar distance of the rotor, and the polar distance of the rotor is equal to the stroke of the free piston type Stirling engine.
Description
Technical Field
The invention belongs to the field of generator equipment, and particularly relates to a short-stroke frequency-doubling single-phase reciprocating permanent magnet linear generator and a power generation system.
Background
The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art.
The power generation system formed by combining the free piston type Stirling engine and the permanent magnet linear generator has the characteristics of high mechanical and thermal efficiency, long service life, simple maintenance, small vibration and noise, reliable sealing, no need of liquid lubrication, wide energy applicability and the like. The system has good market development prospect in the system fields of space energy, underwater energy, small-sized combined heat and power, solar thermal power generation, portable power generation, power generation in extreme remote areas, waste heat utilization power generation and the like.
The inventor finds that the reciprocating linear motion of the free piston type Stirling engine is quasi-simple harmonic motion, and when the stroke is short, the waveform of induced electromotive force of the conventional linear generator is poor, so that the electromagnetic interference on adjacent equipment is strong, and the power generation quality and the electric energy conversion efficiency are influenced.
Disclosure of Invention
In order to solve at least one technical problem in the background art, the invention provides a short-stroke frequency-doubling single-phase reciprocating permanent magnet linear generator and a power generation system, which can generate sine-wave electromotive force under a given working mode.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides a short-stroke frequency-doubling single-phase reciprocating permanent magnet linear generator.
A short-stroke frequency-multiplication single-phase reciprocating permanent magnet linear generator comprises:
a mover;
the stator is uniformly distributed with a plurality of stator teeth on the periphery;
the pitch of the stator teeth is equal to the polar distance of the rotor, and the polar distance of the rotor is equal to the stroke of the free piston type Stirling engine.
Further, the stator is composed of a stator core and a stator annular winding coil.
The shape of the stator core can be specifically set by those skilled in the art according to actual conditions. The winding mode of the stator annular winding coil can be specifically set according to the actual situation, and the description is not repeated here.
Further, adjacent stator ring winding coils are connected in series in an opposite direction to form a single-phase winding.
It should be noted that, those skilled in the art can set the number of phases of the winding, such as three phases or four phases, according to the actual situation.
Furthermore, the rotor consists of a rotor magnetic yoke and rotor magnetic steel.
Furthermore, the rotor magnetic steel adopts a Halbach structure, so that the air gap magnetic field is distributed in a sine shape.
It can be understood here that the rotor magnetic steel may also be implemented by using other structures that make the air gap magnetic field in a sinusoidal distribution, which will not be described here again.
Further, when the rotor does simple harmonic motion, the induced electromotive force of the winding changes according to a sine rule.
Further, the balance position of the rotor is the position where the center of the rotor slot is aligned with the center line of the axially magnetized permanent magnet in the rotor magnetic steel.
Further, the short-stroke frequency-doubling single-phase reciprocating permanent magnet linear generator is cylindrical.
It should be noted here that, besides the cylindrical structure, the short-stroke frequency-doubling single-phase reciprocating permanent magnet linear generator can also adopt a planar or a square structure in principle.
A second aspect of the invention provides a power generation system.
A power generation system comprises a free piston type Stirling engine and the short-stroke frequency-doubling single-phase reciprocating permanent magnet linear generator.
The invention has the beneficial effects that:
the short-stroke frequency-doubling permanent magnet linear generator provided by the invention has the advantages of good output voltage waveform, high frequency and good output waveform, can reduce electromagnetic interference on adjacent equipment, and is particularly important for application occasions such as aviation and aerospace; the output voltage frequency is high, the volume and the mass of the energy conversion device can be reduced, and the conversion efficiency can be improved.
Advantages of additional aspects of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the invention and not to limit the invention.
FIG. 1 is a structural diagram of a short-stroke frequency-doubling single-phase reciprocating permanent magnet linear generator according to an embodiment of the invention;
FIG. 2 is an induced electromotive force of an embodiment of the present invention;
FIG. 3 is a diagram of a motor according to an embodiment of the present invention with a distribution of a pair of under-pole air-gap magnetic fields;
fig. 4 shows a motion law of a motor mover according to an embodiment of the present invention.
Detailed Description
The invention is further described with reference to the following figures and examples.
It is to be understood that the following detailed description is exemplary and is intended to provide further explanation of the invention as claimed. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
In the present invention, terms such as "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", "side", "bottom", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only terms of relationships determined for convenience of describing structural relationships of the parts or elements of the present invention, and are not intended to refer to any parts or elements of the present invention, and are not to be construed as limiting the present invention.
In the present invention, terms such as "fixedly connected", "connected", and the like are to be understood in a broad sense, and mean either a fixed connection or an integrally connected or detachable connection; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be determined according to specific situations by persons skilled in the relevant scientific or technical field, and are not to be construed as limiting the present invention.
The structure of the short-stroke frequency-doubling single-phase reciprocating permanent magnet linear generator of the present embodiment is a cylindrical permanent magnet linear generator as shown in fig. 1.
The generator stator of the embodiment consists of a stator core and a stator annular winding, and adjacent stator coils are connected in series in an opposite direction to form a single-phase winding.
In this embodiment, the mover of the generator is composed of a mover magnetic yoke and a mover magnetic steel.
It should be noted here that the positional relationship between the stator core and the stator ring winding, and the positional relationship between the rotor yoke and the rotor magnetic steel are all the prior art, and will not be described herein again.
The rotor magnetic steel adopts a Halbach structure, so that the air gap magnetic field is distributed as sinusoidal as possible; the pitch of the stator teeth is equal to the polar distance of the rotor, and the polar distance of the rotor is equal to the stroke of the free piston type Stirling engine.
It can be understood here that the rotor magnetic steel may also be implemented by using other structures that make the air gap magnetic field in a sinusoidal distribution, which will not be described here again.
In addition, the skilled person can set the number of phases of the winding, such as three-phase or four-phase, etc., according to the actual situation.
The free piston type Stirling engine and the permanent magnet linear generator are combined to form a power generation system.
It should be noted here that, besides the cylindrical structure, the short-stroke frequency-doubling single-phase reciprocating permanent magnet linear generator can also adopt a planar or a square structure in principle.
In this embodiment, the balance position of the mover is a position where the center of the stator slot is aligned with the center line of the axially magnetized permanent magnet in the magnetic steel of the mover.
When the mover starts to move in simple harmonic mode at the equilibrium position shown in fig. 1 and the stroke equals to the pole pitch, the induced electromotive force of the winding can be expressed as:
in the formula, e-winding induces electromotive force; k-proportionality coefficient; b ism-air gap flux density amplitude; vm-a mover movement velocity amplitude; x-linear displacement of the rotor; tau-motor pole pitch; omega-mover motion angular frequency; t-time; em-induced electromotive force amplitude.
Therefore, when the motor rotor does simple harmonic motion, the induced electromotive force of the winding changes according to a sine rule, the frequency is 2 times of the oscillation frequency of the traditional permanent magnet linear generator, and the waveform of the induced electromotive force is shown in fig. 2. The motor of fig. 3 is a distribution of air gap magnetic field under a pair of poles. Fig. 4 shows a motor rotor motion law.
The short-stroke frequency-doubling permanent magnet linear generator provided by the embodiment has the advantages of good output voltage waveform, high frequency and good output waveform, can reduce electromagnetic interference on adjacent equipment, and is particularly important for application occasions such as aviation and aerospace;
the short-stroke frequency-doubling permanent magnet linear generator provided by the embodiment has high output voltage frequency, the size and the mass of the energy conversion device can be reduced, the conversion efficiency can be improved, and the frequency of the induced electromotive force is 2 times of the oscillation frequency of the traditional permanent magnet linear generator.
The embodiment also provides a power generation system which comprises the free piston type Stirling engine and the short-stroke frequency multiplication single-phase reciprocating permanent magnet linear generator.
It should be noted here that other structures of the power generation system are all existing structures, and will not be described here again.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. A short-stroke frequency-multiplication single-phase reciprocating permanent magnet linear generator is characterized by comprising:
the stator is uniformly distributed with a plurality of stator teeth on the periphery and consists of a stator core and a stator annular winding coil, the stator core is provided with a slot, the annular winding coil is wound in the slot, and the width of the slot opening of the slot is smaller than that of the slot;
the rotor consists of a rotor magnetic yoke and rotor magnetic steel, the rotor magnetic steel adopts a Halbach structure so that an air gap magnetic field is distributed in a sine shape, and the balance position of the rotor is an alignment position of the center of a stator slot and the center line of an axial magnetizing permanent magnet in the rotor magnetic steel;
the pitch of the stator teeth is equal to the polar distance of the rotor, and the polar distance of the rotor is equal to the stroke of the free piston type Stirling engine.
2. The short-stroke frequency-doubled single-phase reciprocating permanent magnet linear generator according to claim 1, wherein adjacent stator ring winding coils are connected in series in an opposite direction to form a single-phase winding.
3. The short-stroke frequency-doubling single-phase reciprocating permanent magnet linear generator according to claim 1, wherein when the rotor performs simple harmonic motion, the induced electromotive force of the winding changes according to a sine law.
4. The short-stroke frequency-doubled single-phase reciprocating permanent magnet linear generator according to claim 1, wherein the short-stroke frequency-doubled single-phase reciprocating permanent magnet linear generator is cylindrical.
5. The short-stroke frequency-doubled single-phase reciprocating permanent magnet linear generator according to claim 1, wherein the short-stroke frequency-doubled single-phase reciprocating permanent magnet linear generator is of a planar or square structure.
6. An electrical power generation system comprising a free piston stirling engine and a short stroke frequency doubled single phase reciprocating permanent magnet linear generator according to any one of claims 1 to 5.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011125477.4A CN112260478B (en) | 2020-10-20 | 2020-10-20 | Short-stroke frequency-doubling single-phase reciprocating permanent magnet linear generator and power generation system |
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| CN202011125477.4A CN112260478B (en) | 2020-10-20 | 2020-10-20 | Short-stroke frequency-doubling single-phase reciprocating permanent magnet linear generator and power generation system |
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| CN112260478B true CN112260478B (en) | 2021-11-30 |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202085055U (en) * | 2011-01-26 | 2011-12-21 | 麦伟仪 | Halbach magnet array permanent magnetism linear generator |
| CN107453578A (en) * | 2017-06-12 | 2017-12-08 | 沈阳工业大学 | Magnetic flux parallel connection frequency multiplication cylinder type permanent magnet linear Oscillatory generator |
-
2020
- 2020-10-20 CN CN202011125477.4A patent/CN112260478B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202085055U (en) * | 2011-01-26 | 2011-12-21 | 麦伟仪 | Halbach magnet array permanent magnetism linear generator |
| CN107453578A (en) * | 2017-06-12 | 2017-12-08 | 沈阳工业大学 | Magnetic flux parallel connection frequency multiplication cylinder type permanent magnet linear Oscillatory generator |
Non-Patent Citations (3)
| Title |
|---|
| 一种海浪发电用永磁单相直线电机的工作特性与实验分析;张静等;《电工技术学报》;20130731;第28卷(第7期);全文 * |
| 圆筒型直线发电机磁路结构设计研究;伍帆;《中国优秀硕士学位论文全文数据库 工程科技II辑》;20200115(第01期);第15、33-34、43-48、74页 * |
| 自由活塞直线发电机关键技术研究;仲伟波;《中国博士学位论文全文数据库 工程科技Ⅱ辑》;20200515(第5期);全文 * |
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