CN102832721B - Adjusting method for coil air gap of energy taking power supply - Google Patents
Adjusting method for coil air gap of energy taking power supply Download PDFInfo
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- CN102832721B CN102832721B CN201210303706.6A CN201210303706A CN102832721B CN 102832721 B CN102832721 B CN 102832721B CN 201210303706 A CN201210303706 A CN 201210303706A CN 102832721 B CN102832721 B CN 102832721B
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Abstract
The invention provides an adjusting method for a coil air gap of an energy taking power supply, comprising the following steps: the cutoff current and saturation current of a coil without an air gap are obtained; the saturation current of the coil with the air gap is obtained according to the saturation current of the coil without the air gap; the input current of the primary side of the coil with the air gap is obtained; the voltage change relation of the secondary side of the coil before and after the air gap is added to the coil is obtained according to the input current, the cutoff current, and the saturation current of the coil with the air gap; the coil air gap required to be adjusted is obtained according to the target induction voltage and the voltage change relation; and the actual coil air gap of the energy taking power supply is adjusted according to the coil air gap required to be adjusted. The influence of the adjusted coil air gap of the energy taking power supply on the induction voltage can be quantitative, and the actual coil air gap of the power supply can be accurately adjusted according to the induction voltage needing to be obtained.
Description
Technical field
The present invention relates to electromagnetic induction technical field, particularly relate to a kind of method of adjustment of draw-out power supply coil air gap.
Background technology
Along with the expansion of national intelligent grid work and improving constantly of transmission line electric pressure, on-line monitoring is carried out to the safe operation of power transmission line and seems particularly important.In order to power to being operated in the on high-tension side various on-line monitoring system of transmission line, need to develop a kind of power supply at high-pressure side long time stability.
Wherein induction energy fetching power supply is practical, it is the most promising supply power mode, in the power supply of current induction energy fetching, in order to avoid the degree of depth of coil is saturated, add the complicated circuit of the state of the regulating winding such as control circuit, compensating circuit work accordingly, make power circuit complicated, reduce reliability.
But when the product of the monitoring system induction energy fetching power supply of reality is tested, occur in various degree coil vibration, be due to coil be in the degree of depth saturation condition time, core loss increase, cause coil to vibrate.For head it off, can reduce saturated to increase the electric current scope of application by introducing coil air-gap reluctance, but majority just being analyzed qualitatively on the impact of coil air gap, not having clear and definite method quantitatively to increase impact on induced voltage after coil air gap; Thus, make troubles to induction energy fetching application, be difficult in actual applications determine the voltage for required induction electric energy, how adjust power coil air gap.
Summary of the invention
The object of the invention is to the method for adjustment proposing a kind of draw-out power supply coil air gap, the coil air gap that can quantify adjustment draw-out power supply, on the impact of induced voltage, according to the induced voltage of required acquisition, accurately adjusts power supply actual coil air gap.
For achieving the above object, the technical scheme of employing is:
A method of adjustment for draw-out power supply coil air gap, comprises step:
Obtain cut-off current and the saturation current of coil when not increasing air gap;
According to the saturation current of coil when not increasing air gap, obtain the saturation current of coil when increasing air gap;
Obtain the input current of coil primary side when increasing air gap;
According to the saturation current of coil when input current, cut-off current and increase air gap, obtain the change in voltage relation of the coil secondary side increased before and after coil air gap;
According to target induced voltage and change in voltage relation, obtain the coil air gap that need adjust;
According to the coil air gap that need adjust, the actual coil air gap of adjustment draw-out power supply.
The present invention, according to the data of the primary side current of air-gap-free and secondary side induced voltage and relation curve, obtains cut-off current and the saturation current of coil during air-gap-free; And then calculate increase one fixed width air gap after, primary side input current in different regions, the variation relation of coil secondary side induced voltage when induced voltage does not increase air gap relatively under identical input current; Therefore when electric current is certain, can according to the size going for voltage, thus determine the width of air gap that will increase; The coil air gap that can quantify adjustment draw-out power supply, on the impact of induced voltage, according to the induced voltage of required acquisition, accurately adjusts power supply actual coil air gap.
Accompanying drawing explanation
Fig. 1 is one embodiment of the present of invention flow chart.
Embodiment
For ease of understanding, below in conjunction with accompanying drawing, the present invention will be described.
A method of adjustment for draw-out power supply coil air gap, please refer to Fig. 1, comprises step:
S101, the cut-off current obtaining coil when not increasing air gap and saturation current;
S102, saturation current according to coil when not increasing air gap, obtain the saturation current of coil when increasing air gap;
The input current of coil primary side when S103, acquisition increase air gap;
S104, the saturation current of coil according to input current, cut-off current and when increasing air gap, obtain the change in voltage relation of the coil secondary side increased before and after coil air gap;
S105, according to target induced voltage and change in voltage relation, obtain the coil air gap that need adjust;
S106, according to the coil air gap that need adjust, adjustment draw-out power supply actual coil air gap.
The present invention, according to the data of the primary side current of air-gap-free and secondary side induced voltage and relation curve, obtains cut-off current and the saturation current of coil during air-gap-free; And then calculate increase one fixed width air gap after, primary side input current in different regions, the variation relation of coil secondary side induced voltage when induced voltage does not increase air gap relatively under identical input current; Therefore when electric current is certain, can according to the size going for voltage, thus determine the width of air gap that will increase; The coil air gap that can quantify adjustment draw-out power supply, on the impact of induced voltage, according to the induced voltage that need obtain, accurately adjusts power supply actual coil air gap.
Understand the present invention for clearer, will set forth from lower part:
One, cut-off current and the saturation current of coil when not increasing air gap is obtained;
According to the primary side current of air-gap-free coil and the data of secondary side induced voltage and relation curve, obtain cut-off current and the saturation current of coil during air-gap-free; During concrete enforcement, can first by the data of the primary side current of air-gap-free coil and secondary side induced voltage and relation curve import system, like this, carrying out in process of the present invention, the cut-off current of coil and saturation current when just can directly carry out obtaining air-gap-free from system end.
Two, according to the saturation current of coil when not increasing air gap, the saturation current of coil when increasing air gap is obtained;
Concrete, steps A and B can be comprised;
A, according to formula
b
m=μ
0μ
feh
mand μ
r=μ
0μ
feobtain coil relative permeability;
B, according to formula
and B
m=μ
0μ
feh
fe=μ
0μ
δh
δthe saturation current of coil when obtaining increasing air gap; Wherein, I
mfor the saturation current of coil during increase air gap; B
mfor saturation induction density; H
mfor total magnetic field intensity; H
δfor the magnetic field intensity of air gap; H
fefor the magnetic field intensity of iron material; l
δfor coil gas length; l
fefor iron circuit length; I
0for described do not increase air gap time coil saturation current; N
1for the first siding ring number of turn of coil; μ
fefor the magnetic permeability of iron material; μ
rfor described coil relative permeability, μ
0for permeability of vacuum; μ
δfor the relative permeability of air, be 1.
Parameter according to the iron core getting energy coil searches operating mode table, can know the saturation induction density B of coil
m, iron core magnetic permeability μ
fe, the lamination coefficient lambda of iron core, the cross-sectional area S of iron core, coil primary side input electric current I, the number of turn N of coil primary side
1, the length l of total magnetic circuit, iron circuit length l
fe; Air-gap magnetic circuit length l
δ, line voltage frequency f; Second siding ring number of turn N
2.When being in saturation region, magnetic flux density is definite value, i.e. B
m=1.25T(Si Tela), μ
δ=1.
Three, the input current of coil primary side when increasing air gap is obtained;
The input current of coil primary side during increase air gap, system obtains by survey tool.
Four, according to the saturation current of coil when input current, cut-off current and increase air gap, the change in voltage relation of the coil secondary side increased before and after coil air gap is obtained;
The present invention will from linear zone, gradually saturation region and three, saturation region zones of different, obtain the coil secondary side induced voltage after increasing air gap, the variation relation of coil secondary side induced voltage when relatively not increasing air gap under identical input current; Concrete, comprise step:
C, according to formula
coil secondary side voltage saturation value when obtaining increasing air gap;
D, when input current is less than cut-off current, that is, when being in linear zone,
According to formula
obtain the voltage change of coil secondary side:
E, be greater than or equal to cut-off current when input current, and when being less than the saturation current of coil when increasing air gap, that is, be in gradually saturation region time;
According to formula
obtain the voltage change range of coil secondary side;
F, when input current be greater than or equal to increase air gap time coil saturation current time, that is, when being in saturation region;
The voltage change of coil secondary side is obtained according to formula Δ U=U; When being in saturation region, the voltage change of coil secondary side is definite value.
Wherein, U=U
0-U
2; U
2for coil secondary side voltage saturation value during increase air gap; Δ U is the voltage change of coil secondary side; F is the current voltage frequency of electrical network; N
2for the second siding ring number of turn of coil; S is the cross-sectional area of iron core; λ is the lamination coefficient of iron core; I
1for cut-off current; I is input current; L is the total length of magnetic path of coil; U
0for air-gap-free secondary side voltage saturation value.
Five, according to target induced voltage and change in voltage relation, the coil air gap that need adjust is obtained;
Can be obtained by step 4, when increasing coil air gap, the change of the induced voltage that coil secondary side is corresponding, thus according to the change in voltage relation obtained in coil secondary side induced voltage when the size of the target induced voltage that need obtain, coil air gap and step 4, can obtain and need adjust coil air gap value.
The acquisition of coil secondary side induced voltage when not increasing coil air gap, those skilled in the art can obtain according to relevant parameter.
Six, according to the coil air gap that need adjust, the actual coil air gap of adjustment draw-out power supply.
System, according to adjusting coil air gap value, adjusts the actual coil air gap of draw-out power supply, thus makes draw-out power supply export the voltage conformed to target induced voltage.
The above embodiment only have expressed several execution mode of the present invention, and it describes comparatively concrete and detailed, but therefore can not be interpreted as the restriction to the scope of the claims of the present invention.It should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection range of patent of the present invention should be as the criterion with claims.
Claims (1)
1. a method of adjustment for draw-out power supply coil air gap, is characterized in that, comprises step:
According to the primary side current of air-gap-free coil and the data of secondary side induced voltage and relation curve, obtain cut-off current and the saturation current of coil when not increasing air gap;
According to described do not increase air gap time coil saturation current, obtain the saturation current of coil when increasing air gap;
Obtain the input current of coil primary side when increasing air gap;
According to the saturation current of coil when described input current, described cut-off current and described increase air gap, obtain the change in voltage relation of the coil secondary side increased before and after coil air gap;
According to target induced voltage and described change in voltage relation, obtain the coil air gap that need adjust;
According to the described coil air gap that need adjust, the actual coil air gap of adjustment draw-out power supply,
The saturation current of coil when described basis does not increase air gap, the step obtaining the saturation current of coil when increasing air gap comprises:
According to formula
b
m=μ
0μ
feh
mand μ
r=μ
0μ
feobtain coil relative permeability;
According to formula
and B
m=μ
0μ
feh
fe=μ
0μ
δh
δthe saturation current of coil when obtaining increasing air gap; Wherein, I
mfor the saturation current of coil during described increase air gap; B
mfor saturation induction density; H
mfor total magnetic field intensity; H
δfor the magnetic field intensity of air gap; H
fefor the magnetic field intensity of iron material; l
δfor coil gas length; l
fefor iron circuit length; I
0for described do not increase air gap time coil saturation current; N
1for the first siding ring number of turn of coil; μ
fefor the magnetic permeability of iron material; μ
rfor described coil relative permeability, μ
0for permeability of vacuum; μ
δfor the relative permeability of air,
The described saturation current according to coil when input current, cut-off current and increase air gap, obtains after increasing coil air gap and is specially relative to the step of the coil secondary side change in voltage relation for increasing coil air gap;
According to formula
coil secondary side voltage saturation value when obtaining increasing air gap;
When described input current is less than described cut-off current, according to formula
Obtain the voltage change of coil secondary side:
When described input current is greater than or equal to described cut-off current, and when being less than described increase air gap during the saturation current of coil, according to formula
Obtain the voltage change range of coil secondary side;
When described input current is greater than or equal to described increase air gap during the saturation current of coil, obtain the voltage change of coil secondary side according to formula Δ U=U;
Wherein, U=U
0-U
2; U
2for coil secondary side voltage saturation value during described increase air gap; Δ U is the voltage change of coil secondary side; F is the current voltage frequency of electrical network; N
2for the second siding ring number of turn of coil; S is the cross-sectional area of iron core; λ is the lamination coefficient of iron core; I
1for described cut-off current; I is described input current; L is the total length of magnetic path of coil; U
0for air-gap-free secondary side voltage saturation value.
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| DE102018212680A1 (en) * | 2018-07-30 | 2020-01-30 | E.G.O. Elektro-Gerätebau GmbH | Method and device for inductive energy transmission |
| CN110542871B (en) * | 2019-10-10 | 2020-06-05 | 华北电力大学 | Magnetic characteristic measurement system and method for magnetic material |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101814775A (en) * | 2010-04-14 | 2010-08-25 | 武汉大学 | Parameter matching method for induction power-taking device for overhead high-voltage transmission line |
| CN202150743U (en) * | 2011-07-01 | 2012-02-22 | 广东电网公司电力科学研究院 | Coupling energy taking power supply system for high voltage transmission line fault monitoring |
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| KR100736053B1 (en) * | 2005-10-24 | 2007-07-06 | 삼성전자주식회사 | Apparatus and method of wireless power sharing by induction method |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101814775A (en) * | 2010-04-14 | 2010-08-25 | 武汉大学 | Parameter matching method for induction power-taking device for overhead high-voltage transmission line |
| CN202150743U (en) * | 2011-07-01 | 2012-02-22 | 广东电网公司电力科学研究院 | Coupling energy taking power supply system for high voltage transmission line fault monitoring |
Non-Patent Citations (3)
| Title |
|---|
| 一种输电线路大功率取能电源的设计;龚贤夫等;《电力系统保护与控制》;20120201;第40卷(第3期);124-128,134 * |
| 输电线路状态监测系统取能电源的设计新原理;李志先等;《电力系统自动化》;20080110;第32卷(第1期);76-80 * |
| 输电线高电位取能电源的研制;王赞等;《电网与清洁能源》;20100630;第26卷(第6期);23-27 * |
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