CN2238440Y - Neodymium iron boron braking magnetic steel combination body for kilowatt-hour meter - Google Patents
Neodymium iron boron braking magnetic steel combination body for kilowatt-hour meter Download PDFInfo
- Publication number
- CN2238440Y CN2238440Y CN 95215589 CN95215589U CN2238440Y CN 2238440 Y CN2238440 Y CN 2238440Y CN 95215589 CN95215589 CN 95215589 CN 95215589 U CN95215589 U CN 95215589U CN 2238440 Y CN2238440 Y CN 2238440Y
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- magnetic
- magnetic steel
- recessed
- permanent magnet
- pole
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- Expired - Fee Related
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- Dynamo-Electric Clutches, Dynamo-Electric Brakes (AREA)
Abstract
The utility model discloses a neodymium iron boron braking magnetic steel combination body for a kilowatt-hour meter, which belongs to the field of braking magnetic steel in the constructional parts of the electromechanical device of the time integral of current. The utility model is mainly suitable for a kilowatt-hour meter. The structure of the braking magnetic steel composite unit of the utility model is composed of a supporting frame, the main pole of the rare earth permanent magnet of neodymium iron boron, magnetic temperature compensating alloy, the fine regulating system of the secondary magnetic pole of a magnet piece and a fixing sleeve. The structural style formed by the parts is a Chinese character 'ao '-shaped body, and two 'ao'-shaped bodies are assembled into the braking magnetic steel composite unit according to symmetrical magnetic paths. The variable quantity of the magnetic flux density (namely, magnetic field gradient) of the air gap position of one pair of main and secondary magnetic poles of the braking magnetic steel composite unit can be relatively compensated by the other pair of main and secondary magnetic poles, and the magnetic field gradient can be approached to zero.
Description
The utility model belongs to the brake magnetic steel field in the time integral machine-electric installation structure parts of electric current.Mainly be applicable to the watt-hour meter of various models.
Brake magnetic steel in the watt-hour meter (being permanent magnet) acts on the dish of operating garden, make it to produce braking moment, because the magnetic line of force of operating garden dish cutting brake magnetic steel (being permanent magnet), cause on the panel surface of garden, producing eddy current, the interaction in eddy current and magnetic field, produce and garden dish rotation direction opposite effect moment, therefore make the at the uniform velocity running of garden dish.
In order to guarantee that watt-hour meter has good temperature characterisitic, at brake magnetic steel assembly configuration magnetic temperature compensating alloy, rising (or reduction) along with temperature, the magnetic permeability of magnetic temperature compensating alloy reduces (or rising) accordingly, then by its magnetic flux along with reducing (or increasing) thus cause the increase (or minimizing) of the magnetic flux of brake magnetic steel assembly, the error that temperature value is changed is well compensated.
For guarantee watt-hour meter accurately and serviceable life, require the brake magnetic steel assembly to have little magnetic field gradient, high magnetic flux density and big coercive force.
Based on above-mentioned requirements, two " recessed " shape one-piece constructions of the employing that present brake magnetic steel assembly structurally has, the single multipole structure of the employing that has has the Al-Ni-Co series of employing permanent-magnet alloy on permanent magnetic material is selected, or the Fe-B rare-earth permanent magnet of various models.But the sort of structure all can't accomplish not have magnetic field gradient to exist on magnetic Circuit Design, and homogeneity is bad, for satisfying the requirement of watt-hour meter degree of accuracy, must strengthen the magnet steel volume, causes cost to rise.
The purpose of this utility model is to provide a kind of does not have magnetic field gradient to exist, magnetic flux density height, the watt-hour meter that coercive force is big Nd-Fe-B rare-earth permanent magnet brake magnetic steel assembly.
According to above-mentioned purpose, the utility model structurally adopts fabricated structure, and promptly brake magnetic steel is an assembly.It is by two Fe-B rare-earth permanent magnet main poles, two magnetic conduction iron block secondary magnetic poles, four magnetic temperature compensating alloies, magnetic field micro-tensioning system and bearing supports are formed the brake magnetic steel assembly, and the Nd-Fe-Bo permanent magnet material that adopts small size is as the permanent magnet sources in the brake magnetic steel assembly.
The utility model adopts abovementioned technology, the air-gap flux that makes brake magnetic steel is greater than 4000 oersteds, temperature coefficient is less than 0.015%, satisfied the requirement of every performance index of watt-hour meter fully, make cost greatly reduce than alnico alloy be permanent magnet low approximately half, than about one of low five parts of other structure of neodymium iron boron, efficient improves about 10.
Compared with prior art, the utlity model has following advantage:
1. brake magnetic steel has main pole and secondary magnetic pole to compensate mutually, magnetic field gradient convergence zero, and magnetic flux density height, and coercive force is big, and braking is even, stable performance.
2. the brake magnetic steel volume is little, and is in light weight.
3. it is low double, simple for assembly process to manufacture cost, is convenient to promote.
Now the utility model is described in further detail in conjunction with the accompanying drawings.
Accompanying drawing is the structural representation of the utility model watt-hour meter with Nd-Fe-B rare-earth permanent magnet brake magnetic steel assembly.
In the accompanying drawing: 1 is bearing support; 2 is fixed cover; 3 is the Nd-Fe-B permanent magnet main pole; 4 is magnetic temperature compensating alloy; 5 is magnetic conduction iron block secondary magnetic pole; 6 is fine-regulation system.
Form by bearing support 1, fixed cover 2, Nd-Fe-B permanent magnet main pole 3, magnetic temperature compensating alloy 4, magnetic conduction iron block secondary magnetic pole 5 and fine-regulation system 6 that " recessed " font body is corresponding to be assembled into a complete brake magnetic steel assembly.Two " recessedly " air gap is arranged between the font body.
Claims (1)
- A kind of watt-hour meter Nd-Fe-B rare-earth permanent magnet brake magnetic steel assembly, be assembled by the magnetic circuit symmetry by two " recessed " font bodies, between two " recessed " font bodies an air gap is arranged, " recessed " font body comprises Nd-Fe-B permanent magnet main pole, magnetic conduction iron block secondary magnetic pole, bearing support, magnetic temperature compensating alloy, fine-regulation system and fixed cover.It is characterized in that:" recessed " font body by support 1., fixed cover 2., the Nd-Fe-B permanent magnet main pole 3., magnetic temperature compensating alloy 4., 6. 5. magnetic conduction iron block secondary magnetic pole form with fine-regulation system.4. 3. the Nd-Fe-B permanent magnet main pole closely contact with magnetic temperature compensating alloy, with magnetic conduction iron block secondary magnetic pole 5., be anchored on bearing support with fixed cover and 1. go up, form " recessed " font body, being loaded between two " recessed " font bodies that 1. support go up has an air gap.3. " recessed " font body constitutes main pole by Nd-Fe-B permanent magnet, 5. constitutes secondary magnetic pole by the magnetic conduction iron block, and their combination backs form compensation mutually makes magnetic field gradient level off to zero.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 95215589 CN2238440Y (en) | 1995-06-22 | 1995-06-22 | Neodymium iron boron braking magnetic steel combination body for kilowatt-hour meter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 95215589 CN2238440Y (en) | 1995-06-22 | 1995-06-22 | Neodymium iron boron braking magnetic steel combination body for kilowatt-hour meter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2238440Y true CN2238440Y (en) | 1996-10-23 |
Family
ID=33864903
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 95215589 Expired - Fee Related CN2238440Y (en) | 1995-06-22 | 1995-06-22 | Neodymium iron boron braking magnetic steel combination body for kilowatt-hour meter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2238440Y (en) |
-
1995
- 1995-06-22 CN CN 95215589 patent/CN2238440Y/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |