CN2697939Y - Jaw polar type vortex brake - Google Patents
Jaw polar type vortex brake Download PDFInfo
- Publication number
- CN2697939Y CN2697939Y CN 200420021450 CN200420021450U CN2697939Y CN 2697939 Y CN2697939 Y CN 2697939Y CN 200420021450 CN200420021450 CN 200420021450 CN 200420021450 U CN200420021450 U CN 200420021450U CN 2697939 Y CN2697939 Y CN 2697939Y
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- excitation
- magnetic
- utility
- supplementary
- eddy
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- Dynamo-Electric Clutches, Dynamo-Electric Brakes (AREA)
Abstract
The utility model aims to design a jaw polar type vortex brake. In order to improve the air gap flux density of the jaw polar type vortex brake to decrease the volume and weight thereof, the utility model adopts a measure of a supplementary excitation except a main flux. The supplementary excitation is implemented by the permanent-magnetic steel of rare earth embedded between the paw poles of iron cores. When excitation magnetic potential exists, supplementary magnetic flux is connected with the main flux in parallel and doesn't pass through the root of the paw pole. When the excitation magnetic potential disappears, the permanent magnetic flux passes through the iron core of the paw pole in short circuit and in opposite direction. Little magnetic leakage flows over an armature rotor, and the supplementary magnetic flux doesn't exceed 30% generally. So remanence moment has minor effect and doesn't need to use the cancellation of reversal excitation. The jaw polar type vortex brake of the utility model can create condition for the miniaturization and lightweighting of an electromagnetic slip clutch used for regulating the speed of a large and medium-sized eddy-current brake for lifting, except serving as a heavy-duty car retarder.
Description
Technical field
The utility model relates to a kind of eddy-current brake, is meant a kind of Lundell eddy-current brake especially.
Background technology
Eddy-current brake and electromagnetic slip clutch are extensively adopted by each industrial department of China already, particularly the Lundell eddy-current brake is because simple and reliable economical and practical, in China's crane governing system, use very general, relevant bridge motor factory can both produce supporting greatly voluntarily, and aspect auto industry, though abroad already it is used for descending such as truck, engineering truck, touring car and bus as retarder and the deceleration when turning, China just payes attention to this problem in recent years.External automobile eddy-current brake mostly is salient pole type or disc type greatly, it can obtain smaller size smaller and than light weight with bigger air gap flux density, but exciting power is big many, is about 4～5 times of Lundells, thereby having increased the burden of automobile storage battery, the user is also not too satisfied.The magneto eddy-current brake has appearred again later on, the little excitation that do not need again of its volume in light weight, as if very desirable, but difficult control, no matter adopt jaw clutch or change the monoblock armature rotor into wound rotor or stator winding, all will make simple question more complicated, cost increases, and reliability reduces.
The utility model content
The purpose of this utility model provides a kind of the utilization and replenishes the Lundell eddy-current brake that excitation improves air gap flux density.
For reaching above-mentioned purpose, Lundell eddy-current brake of the present utility model comprises armature rotor, and two iron cores are characterized in also comprising: be clipped in the annular electro magnetic induction coil between described two iron cores, and be embedded the permanent-magnet steel between the pawl utmost point magnetic pole of iron core.
Above-mentioned permanent-magnet steel is the rare earth permanent-magnet steel.
Adopt such structure, when excitation magnetic potential exists, it is in parallel with main flux and without pawl utmost point root to replenish magnetic flux, when excitation magnetic potential disappears, permanent magnet flux oppositely through the short circuit of pawl utmost point iron core, has only a small amount of leakage field to flow through armature rotor, generally replenishes magnetic flux and is no more than 30%, so the influence of remanent magnetism moment is very little, not necessarily to offset with reverse excitation.
For further specifying above-mentioned purpose of the present utility model, design feature and effect, the utility model is described in detail below with reference to accompanying drawing.
Description of drawings
Fig. 1 is the structural representation according to the utility model Lundell eddy-current brake.
Fig. 2 is the partial sectional view of being got along A-A line among Fig. 1, and main flux and additional flux path line chart are shown.
Fig. 3 is a pawl utmost point inductor magnetic pole pole-face expanded view.
Embodiment
Well-known eddy-current brake overall dimension one is square being directly proportional of its maximum braking moment and air gap flux density first harmonic amplitude regularly, the Lundell eddy-current brake is because utmost point root is saturated easily, its air gap flux density is all lower than salient pole type and disc type, as embed at interpolar rare earth magnetic steel then can produce one be in parallel with main field and without the additional magnetic field of pawl utmost point root to increase air gap flux density.On original excitation basis, increase by 12%～50% permanent magnet flux density according to calculating, the maximum braking moment of Lundell eddy-current brake can increase by 25%～125%, that is to say that maximum moment requires one regularly, its volume weight can reduce half approximately, and (the comparable disc type of weight is light, exciting power less than its 1/4), except that can be used as the automobile retarder, condition has been created in the miniaturization lightweight that also can be electromagnetic slip clutch that original and big-and-middle-sized eddy-current brake that bridge motor YZRW is supporting and speed governing use etc.
Be illustrated in figure 1 as structural representation according to the utility model Lundell eddy-current brake.Suspension is fixed on the inductor on gearbox tank wall or the crane motor end cap, two iron cores 1 about it comprises, and annular electro magnetic induction coil 2 that is clipped between two iron cores 1, and be embedded rare earth permanent-magnet steel 3 between the pawl utmost point magnetic pole of iron core 1, the armature rotor 4 that is connected (or directly being enclosed within on the motor reel) on the arbor when flange just cutting magnetic line and produce eddy current when either direction is rotated produces powerful braking moment simultaneously on arbor.If B
LWith B
YBe respectively excitation and permanent magnet flux density component, the ratio M of then synthetic braking moment and excitation braking moment
H/ M
L=(B
L+ B
Y)
2/ B
L 2=1/B
L 2Different B
L/ B
YM
H/ M
LAs shown in the table:
| B L/B Y | 0.9/0.1 | 0.85/0.15 | 0.8/0.2 | 0.75/0.25 | 0.7/0.3 | 0.6667/0.3333 |
| M H/M L＝1/B L 2 | 1.2345 | 1.3841 | 1.5625 | 1.7778 | 2.0408 | 2.25 |
The permanent magnetism component is 10%～30% o'clock in the ordinary course of things, remanent magnetism moment should be 1%～9% after the excitation excision, and when pressing present embodiment and arranging magnet steel, most of permanent magnet flux is eliminated oppositely through the iron core short circuit because of excitation magnetic potential, only sub-fraction flows through armature rotor through two air-gaps, so the excess torque influence is very little, not necessarily to offset with reverse excitation, be another characteristics of the present utility model.
After for example the eddy-current brake of 1000 Ns of rice increases by about 42% permanent magnet flux density, B
L/ B
Y=0.704/0.296 is M then
H=1000/0.704
22000 Ns of rice of ≈, it is just passable to that is to say that the eddy-current brake that will make 2000 Ns of rice only need increase several kilograms of magnet steel again with the material of 1000 Ns of rice, and therefore not only volume reduces weight saving but also cost has also reduced.
The Lundell eddy-current clutch (is an electromagnetic slip clutch, China claims slip electric motor again) basic identical with the mechanical structure and the operation principle of Lundell eddy-current brake, though purposes difference (transmitting moment, governing speed) is used the effect same that above-mentioned principle also can obtain to increase the moment weight reduction.
Though the utility model is described with reference to current specific embodiment, but those of ordinary skill in the art will be appreciated that, above embodiment is used for illustrating the utility model, under the situation that does not break away from the utility model spirit, also can make the variation or the replacement of various equivalences, therefore, as long as variation, the modification to the foregoing description all will drop in the scope of application claims in connotation scope of the present utility model.
Claims (2)
1. a Lundell eddy-current brake comprises armature rotor, and two iron cores is characterized in that also comprising: be clipped in the annular electro magnetic induction coil between described two iron cores, and be embedded the permanent-magnet steel between the pawl utmost point magnetic pole of iron core.
2. Lundell eddy-current brake as claimed in claim 1 is characterized in that described permanent-magnet steel is the rare earth permanent-magnet steel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420021450 CN2697939Y (en) | 2004-03-31 | 2004-03-31 | Jaw polar type vortex brake |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420021450 CN2697939Y (en) | 2004-03-31 | 2004-03-31 | Jaw polar type vortex brake |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2697939Y true CN2697939Y (en) | 2005-05-04 |
Family
ID=34769960
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200420021450 Expired - Fee Related CN2697939Y (en) | 2004-03-31 | 2004-03-31 | Jaw polar type vortex brake |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2697939Y (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101340137B (en) * | 2007-07-04 | 2012-04-25 | 刘新广 | Bi-stable magnetic clutch |
| CN103166369A (en) * | 2011-12-13 | 2013-06-19 | 泰乐玛汽车制动***（上海）有限公司 | Retarder for transport equipment |
| CN103259385A (en) * | 2013-05-10 | 2013-08-21 | 北京工业大学 | Liquid-cooled salient pole electromagnetic retarder with lightweight rotor |
| CN109004777A (en) * | 2018-07-26 | 2018-12-14 | 河北工业大学 | A kind of flux-reversal claw-pole motor component |
-
2004
- 2004-03-31 CN CN 200420021450 patent/CN2697939Y/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101340137B (en) * | 2007-07-04 | 2012-04-25 | 刘新广 | Bi-stable magnetic clutch |
| CN103166369A (en) * | 2011-12-13 | 2013-06-19 | 泰乐玛汽车制动***（上海）有限公司 | Retarder for transport equipment |
| CN103259385A (en) * | 2013-05-10 | 2013-08-21 | 北京工业大学 | Liquid-cooled salient pole electromagnetic retarder with lightweight rotor |
| CN109004777A (en) * | 2018-07-26 | 2018-12-14 | 河北工业大学 | A kind of flux-reversal claw-pole motor component |
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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 |