CN101174777B - Insulation split joint type magnetic wedge with function of capturing leakage flux - Google Patents
Insulation split joint type magnetic wedge with function of capturing leakage flux Download PDFInfo
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- CN101174777B CN101174777B CN2006100324773A CN200610032477A CN101174777B CN 101174777 B CN101174777 B CN 101174777B CN 2006100324773 A CN2006100324773 A CN 2006100324773A CN 200610032477 A CN200610032477 A CN 200610032477A CN 101174777 B CN101174777 B CN 101174777B
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- slot
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- wedge
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Abstract
In order to solve the problem that a magnetic slot wedge exerts effects on the efficiency and the load capacity of a motor, a proposal of 'an insulating jointed magnetic slot wedge has the function to intercept and capture the leakage magnetic flux in the notch'<ul><li></li></ul>is provided. The proposal includes the jointing interface of a slot-wedge interception plate (4c), a slot-wedge interception plate (5c), a reinforced tooth (6), a lateral surface of a magnetic layer (7), a wedge magnetic layer (8), an insulation gap (12), a rotor iron core 13, a magnetic resistance gap of the slot-wedge interception plate staggered on both sides 14 and a ferromagnetic multi-layer overlay of the wedge magnetic layer (15). Combined with the slot-wedge interception plate, the present invention can not only prohibit the effect of the gear harmonic wave without enlarging the magnetic leakage in the notch, but also lead the magnetic leakage in the original notch and part of the magnetic leakage in the slot bottom to the air gap, and convert the invalid magnetic flux into the valid magnetic flux, thus improving the efficiency and power factor of the motor and increasing the load capacity.
Description
Technical field: the invention belongs to motor and electrical generator fields.
Background technology: because wire insertion technology, big motor adopts open slot and semi-open slot usually, can produce serious slot ripples.At present, the research of magnetic slot-seal aspect raising the efficiency is very ripe, and magnetic slot-seal can suppress slot ripples, thereby can improve electric efficiency and power factor effectively, reduces temperature rise and noise; But, magnetic slot-seal increases because causing leakage flux, can cause the reduction of motor load ability, invent in the last hundred years from magnetic slot-seal, then seem in the research aspect the raising load capacity and be stymied by, to such an extent as to think that magnetic slot-seal must cause the reduction of motor load ability.
The objective of the invention is: attempt to solve the influence problem of magnetic slot-seal efficiency of motor and load capacity, the scheme of " the spliced magnetic slot-seal of insulation that function of capturing leakage flux is arranged " has been proposed, both played the effect that suppresses slot ripples, do not strengthen the notch leakage field again, and original notch leakage field and a part of groove hole leakage field guided to air gap, make these invalid magnetic fluxs change into useful flux, thereby motor not only can be raised the efficiency and power factor, and can improve its load capacity.
Utopian magnetic slot-seal design and analysis are discussed earlier, and this may just dream of, but help to guide our research thinking by the analysis to it.
The magnetic slot-seal of defining idealization can be defined as realizing following six general objectives:
1., eliminate slot ripples;
2., do not increase the notch leakage field;
3., original notch leakage flux is converted into useful flux;
4., original groove hole leakage flux is converted into useful flux;
5., do not increase surface loss;
6., enough mechanical strengths are arranged.
We think by experiment with after analyzing: the key that improves load capacity is to suppress the notch leakage field as best one can, and leakage flux is become useful flux.For this purpose, we have proposed the scheme of " the spliced magnetic slot-seal of insulation of intercepting and capturing the slot leakage flux effect is arranged ", hereinafter to be referred as " cutting leakage formula slot wedge ".
The present invention agreement: " cross section of magnetic slot-seal ", be meant from axially, the cross section of the magnetic slot-seal in the stator upper notch, Fig. 1 is exactly from axially, the cross section of the magnetic slot-seal in the stator upper notch.
Description of drawings:
Fig. 1---the cross section of the magnetic slot-seal from axially see the stator upper notch.
Fig. 2---single-layer type wedge shape magnetic layer and bilateral formula slot wedge cut the magnetic slot-seal of dropping fraction structure.
Fig. 3---multiple field wedge shape magnetic layer and unilateral slot wedge cut the magnetic slot-seal of dropping fraction structure.
1---stator coil; 2---dropping fraction is cut in the stator slot hole; 3---the dropping fraction interface is cut in the groove hole; 4a---bilateral alternating expression slot wedge cuts the dropping fraction interface; 4b---bilateral vertical type slot wedge cuts the dropping fraction interface; 4c---the unilateral slot wedge cuts the dropping fraction interface; 5a---bilateral alternating expression slot wedge cuts dropping fraction; 5b---bilateral vertical type slot wedge cuts dropping fraction; 5c---the unilateral slot wedge cuts dropping fraction; 6---strengthen tooth; 7---the magnetic layer side; 8---single-layer type wedge shape magnetic layer; 9---stator iron core tooth; 10---resin extender; 11---air gap; 12---the insulation seam; 13---rotor core; 14---bilateral alternating expression slot wedge cuts the magnetic resistance breach of dropping fraction; 15---multiple field wedge shape magnetic layer ferromagnetic sheet lamination; D---magnetic layer root thickness.
Invention application content
The cross section structure that " cuts leakage formula slot wedge ", key component is to be spliced into the shape of a saddle (Fig. 1) magnetic layer by left and right sides two parts wedge shape magnetic layer 8, magnetic layer is made by high magnetic conduction ferromagnetic sheet (hereinafter to be referred as ferromagnetic sheet) material, with flux channeled to notch restrain tank ability to speak harmonic wave, the bottom of magnetic layer just in time is to drop on the stator inner headed face, be air gap 11 below it, magnetic layer root thickness d is 1/4～1/10 of open slot width, being estimated as of d (formula 1) or (formula 2); Magnetic layer side 7 is an integral body with magnetic layer 8, the magnetic layer side can be strengthened the magnetic guidance capability and strengthen slot wedge intensity, stay bar insulation seam 12 in magnetic layer splicing place, along the insulation seam magnetic-leakage catching sheet 5a, a 5b or 5c are set, it be take magnetic layer bottom as " ", with ferromagnetic sheet vertical stifled " wall ", hereinafter to be referred as " cutting dropping fraction ". Use then resin extender 10 that the glued one-tenth of left and right sides two parts (magnetic layer side, magnetic layer, section dropping fraction are hereinafter to be referred as ferromagnet) is whole, the reinforcement tooth 6 on the ferromagnet is embedded in the resin extender, to strengthen the bond strength of ferromagnet and resin extender. Stator slot hole is cut a dropping fraction 2 and groove is cheated magnetic-leakage catching cuts dropping fraction 5a, 5b by slot wedge or 5c guides to air gap, converts useful flux to; The effect that groove hole section dropping fraction interface 3 and slot wedge cut dropping fraction interface 4a, 4b or 4c is the guidance capability of strengthening magnetic flux;
1., insulation seam magnetic layer has been taked three big measures:; 2., be the shape of a saddle; 3., cut dropping fraction.
1, two purposes of insulation seam:
1., increase notch magnetic resistance, the increase of inhibition notch leakage magnetic flux. The width of insulation seam is 1/5 to 1/50 of width of rebate, and two magnetic circuits are arranged after leakage field leads to magnetic layer, and one is to arrive rotor core through air gap, is converted into useful flux; Another tooth to the opposite (being the notch leakage field) is opened the insulation seam at magnetic layer, can increase the notch magnetic resistance.
2., to avoid forming the eddy current in big loop. Suppose that magnetic slot-seal is the monoblock conductor, and with the conducting of tooth section, this will be equivalent to the tooth circular surfaces is a cylinder of being made by block of metal, will cause big loop eddy current to produce; And magnetic layer is insulated seam by left and right sides two parts and separates, and just can avoid the generation of big loop eddy current.
2, shape of a saddle magnetic layer is spliced by left and right sides wedge shape magnetic layer, and multiple field wedge shape magnetic layer builds up wedge shape by the multilayer ferromagnetic sheet, and single-layer type wedge shape magnetic layer is made wedge shape by one deck ferromagnetic sheet, two purposes of shape of a saddle magnetic layer:
1., shape of a saddle magnetic layer root is thick, so that notch obtains enough magnetic fluxs.
2., shape of a saddle magnetic layer middle part is thin, the place can form big magnetic resistance at the insulation seam. If the wide air gap that equals of order insulation seam, because magnetic layer is wedge shape, the very thin thickness at insulation seam place, so, the magnetic resistance between insulation seam place left and right sides magnetic layer will much larger than the magnetic resistance between magnetic layer and rotor core, be conducive to leakage magnetic flux is converted into useful flux. So for common magnetic slot-seal, notch leakage magnetic flux originally mostly enters rotor and becomes useful flux, its result will show as load capacity and improve.
3, the purpose of notch, groove hole section dropping fraction:
As its name suggests, be that the magnetic-leakage catching with notch and groove hole gets off, and it is guided to air gap, make leakage magnetic flux become useful flux. If the notch leakage magnetic flux can be become useful flux, that just can be raised the efficiency and torque.
As everyone knows, notch is motor " sensitizing range ", and the notch leakage flux arrives has two magnetic circuits after notch cuts dropping fraction, and a magnetic circuit is (for leakage flux) along the original path of leakage flux; Another magnetic circuit is to cut dropping fraction by notch to guide to air gap, and the notch leakage flux is become useful flux.Obviously, much smaller to the magnetic resistance of the magnetic circuit (ferromagnetic sheet) of air gap.
Notch cuts dropping fraction and also plays effect that scoops out groove hole section dropping fraction and the effect that improves slot wedge intensity, (Fig. 2) notch of the right and left cuts " manor " that dropping fraction reaches the opposite mutually, form the integral body that intermeshes by resin extender, intensity index is undoubted thus.
It is the imagination of a novelty that dropping fraction is cut in the groove hole, and the magnetic-leakage catching sheet is in the middle of the wall of groove hole, the left and right sides and is parallel to groove hole wall, from the principle, can intercept and capture part groove hole leakage flux, cuts dropping fraction and guides to air gap through notch, becomes useful flux.Each interface comprises 3,4a, 4b or 4c, can reduce the groove hole effectively and cut dropping fraction and notch and cut magnetic resistance between the dropping fraction.Technologically, the groove hole is cut dropping fraction and should be installed in rule, also can wrap into winding when making the moulding winding.
Fig. 1 is a schematic diagram, describe a kind of extreme situation: two tooth top portions that set son all are in the peak value of magnetic potential, so between two teeth because magnetic potential equates magnetic leakage free, all can enter into rotor core so be directed to the magnetic flux of notch by magnetic layer, promptly the magnetic flux of magnetic layer root d equals the notch air-gap flux.If: T is a width of rebate; L is the notch axial length; If d is the thickness of magnetic layer root; E is the thickness of the ferromagnetic sheet side of thin magnetic wedge; B
δBe the air gap flux density maximum; B
SSaturation magnetic induction for magnetic material.The area of notch is T*L, and the required total magnetic flux of this area is M=T*L*B
δ, this magnetic flux should be provided jointly by two roots of magnetic layer, and the magnetic flux that each root can provide is d*L*B
SSo estimation equation is:
D=G*B
δ* T/ (2*B
S)------------(formula 1)
G is a correction factor in the formula, approximates 1, treats that experiment is definite.
Consider that width of rebate T should deduct the thickness e of ferromagnetic sheet side, equivalent width of rebate is T-2*e, so estimation equation is modified to:
D=G*B
δ* (T-2*e)/(2*B
S)----------(formula 2)
Above-mentioned formula shows: 1. thickness d is the increasing function of width of rebate T; 2. the B of the magnetic material of magnetic layer
SIt is thin more to be worth high more then desired thickness d, and thin more then leakage field is more little.
Embodiment 1: single-layer type wedge shape magnetic layer and bilateral formula slot wedge cut the magnetic slot-seal of dropping fraction structure
Left and right sides two parts wedge shape magnetic layer 8 is spliced into the shape of a saddle (Fig. 1) magnetic layer, and wedge shape magnetic layer is made by monoblock ferromagnetic sheet material, and magnetic layer root thickness d is 1/4～1/10 of an open slot width, being estimated as of d (formula 1) or (formula 2); Along the insulation seam a bilateral alternating expression magnetic-leakage catching sheet 5a is set, the dropping fraction that cuts on both sides intermeshes, and reach the top of the other side's magnetic layer, and interface 4a in line.In order to reduce leakage field, on section dropping fraction 5a, open a gap 14 in the staggered place to increase magnetic resistance. Adjacent interface 4a or 4b are gapped, to avoid increasing leakage field.Cutting dropping fraction wants retention gap to keep the notch magnetic resistance cutting the close place of dropping fraction with the opposite.
Embodiment 2: multiple field wedge shape magnetic layer and unilateral slot wedge cut the magnetic slot-seal of dropping fraction structure
Wedge shape magnetic layer is made by several layers of ferromagnetic sheet material, and magnetic layer root thickness d is 1/4～1/10 of an open slot width, being estimated as of d (formula 1) or (formula 2); A full wafer magnetic-leakage catching sheet 5c is at the insulation seam place, edge of magnetic layer on one side therein, and interface 4c is a whole piece.
In fact, two of wedge shape magnetic layer kinds of forms (single-layer type and multiple field) can be combined into 6 kinds of structures with three kinds of forms (unilateral, bilateral formula, bilateral alternating expression) of cutting dropping fraction: individual layer unilateral, the bilateral formula of individual layer, the bilateral alternating expression of individual layer; Multilayer unilateral, the bilateral formula of multilayer, the bilateral alternating expression of multilayer.
In a word, the spliced magnetic slot-seal of insulation of intercepting and capturing the slot leakage flux effect is arranged, it is characterized in that: be spliced into shape of a saddle magnetic layer by left and right sides two parts wedge shape magnetic layer 8, magnetic layer is made by high magnetic conduction ferromagnetic sheet (hereinafter to be referred as ferromagnetic sheet) material, with flux channeled to notch with restrain tank ability to speak harmonic wave, the bottom of magnetic layer just in time is to drop on the stator inner headed face, it below it air gap 11, stay bar insulation seam 12 in left and right sides two parts wedge shape magnetic layer splicing place, along the insulation seam magnetic-leakage catching sheet is set, it be with magnetic layer bottom for " ", with ferromagnetic sheet upright stifled " wall ", hereinafter to be referred as " cutting dropping fraction ", use resin extender 10 then with left and right sides two parts (magnetic layer side, magnetic layer, cut dropping fraction, hereinafter to be referred as ferromagnet) glued one-tenth integral body.Build up multiple field wedge shape magnetic layer by the multilayer ferromagnetic sheet, make single-layer type wedge shape magnetic layer by one deck ferromagnetic sheet, wedge shape comprises straight line wedge and arc wedge.The width of insulation seam is 1/3 to 1/50 of a width of rebate.The unilateral slot wedge cuts the dropping fraction structure, only makes notch and cut dropping fraction on the wedge shape magnetic layer of one side; Bilateral formula slot wedge cuts dropping fraction, comprises that bilateral alternating expression slot wedge cuts dropping fraction and bilateral vertical type slot wedge cuts dropping fraction, wants retention gap keeping the notch magnetic resistance cutting the close place of dropping fraction with the opposite, and notch cuts that dropping fraction all has the band interface and not with two kinds of interface.In the stator slot hole, settle the stator slot hole to cut dropping fraction 2, groove is cheated magnetic-leakage catching guide to air gap, convert useful flux to after slot wedge cuts dropping fraction; Dropping fraction is cut in the groove hole an interface 3, and slot wedge cuts dropping fraction also interface 4a, 4b or 4c, and the effect of interface is the guidance capability of strengthening groove hole leakage flux.Magnetic layer root thickness d is 1/4～1/10 of an open slot width, being estimated as of d (formula 1) or (formula 2).Magnetic layer side 7 is an integral body with magnetic layer 8, and the reinforcement tooth 6 on the ferromagnet is embedded in the resin extender, to strengthen the bond strength of ferromagnet and resin extender.
Claims (10)
1. one kind has the spliced magnetic slot-seal of insulation of intercepting and capturing the slot leakage flux effect, comprise a magnetic layer, it is characterized in that: be spliced into shape of a saddle magnetic layer by left and right sides two parts wedge shape magnetic layer (8), magnetic layer is made by high magnetic conduction ferromagnetic sheet material, high magnetic conduction ferromagnetic sheet is hereinafter to be referred as ferromagnetic sheet, with flux channeled to notch with restrain tank ability to speak harmonic wave, the bottom of magnetic layer just in time is to drop on the stator inner headed face, below it air gap (11), stay bar insulation seam (12) in left and right sides two parts wedge shape magnetic layer splicing place, along the insulation seam magnetic-leakage catching sheet is set, it be with magnetic layer bottom for " ", with ferromagnetic sheet upright stifled " wall ",, use resin extender (10) that the glued one-tenth of left and right sides two parts ferromagnet is whole then hereinafter to be referred as " cutting dropping fraction "; Described ferromagnet comprises magnetic layer side, magnetic layer, cuts several parts of dropping fraction.
2. the spliced magnetic slot-seal of insulation that the effect of intercepting and capturing slot leakage flux is arranged according to claim 1, its further feature is to build up multiple field wedge shape magnetic layer by the multilayer ferromagnetic sheet, wedge shape comprises straight line wedge and arc wedge.
3. the spliced magnetic slot-seal of insulation that the effect of intercepting and capturing slot leakage flux is arranged according to claim 1, its further feature is to make single-layer type wedge shape magnetic layer by one deck ferromagnetic sheet, wedge shape comprises straight line wedge and arc wedge.
4. the spliced magnetic slot-seal of insulation that the effect of intercepting and capturing slot leakage flux is arranged according to claim 1, its further feature are that the width of insulation seam is 1/3 to 1/50 of a width of rebate.
5. the spliced magnetic slot-seal of insulation that the effect of intercepting and capturing slot leakage flux is arranged according to claim 1, its further feature is that the unilateral slot wedge cuts the dropping fraction structure, only make notch and cut dropping fraction on the magnetic layer of one side, notch cuts that dropping fraction has the band interface and not with two kinds of interface.
6. the spliced magnetic slot-seal of insulation that the effect of intercepting and capturing slot leakage flux is arranged according to claim 1, its further feature is that bilateral formula slot wedge cuts dropping fraction, comprise that bilateral alternating expression slot wedge cuts dropping fraction and bilateral vertical type slot wedge cuts dropping fraction, two kinds are cut that dropping fraction all has the band interface and not with interface.
7. the spliced magnetic slot-seal of insulation that the effect of intercepting and capturing slot leakage flux is arranged according to claim 1, its further feature is to settle the stator slot hole to cut dropping fraction (2) in the stator slot hole, groove is cheated magnetic-leakage catching guide to air gap, convert useful flux to after slot wedge cuts dropping fraction; Dropping fraction is cut in the groove hole an interface (3), and slot wedge cuts dropping fraction also interface (4a, 4b or 4c), and their effect is the guidance capability of strengthening groove hole leakage flux.
8. according to claim 1 have a spliced magnetic slot-seal of insulation of intercepting and capturing the slot leakage flux effect, and its further feature is that magnetic layer root thickness (d) is 1/4～1/10 of open slot width, being estimated as (d) (formula 1) or (formula 2),
D=G*B
δ* T/ (2*B
S)------------(formula 1)
D=G*B
δ* (T-2*e)/(2*B
S)----------(formula 2)
D is the thickness of magnetic layer root; T is a width of rebate; B
δBe the air gap flux density maximum; B
SSaturation magnetic induction for magnetic material; E is the thickness of the ferromagnetic sheet side of thin magnetic wedge; G is a correction factor, is determined by experiment.
9. the spliced magnetic slot-seal of insulation that the effect of intercepting and capturing slot leakage flux is arranged according to claim 1, its further feature is that magnetic layer side (7) is an integral body with magnetic layer (8), reinforcement tooth (6) on the ferromagnet is embedded in the resin extender, to strengthen the bond strength of ferromagnet and resin extender.
10. the spliced magnetic slot-seal of insulation that the effect of intercepting and capturing slot leakage flux is arranged according to claim 1, its further feature are that single-layer type and two kinds of forms of multiple field of wedge shape magnetic layer can be combined into 6 kinds of structures with three kinds of forms of unilateral, bilateral formula, bilateral alternating expression of cutting dropping fraction: individual layer unilateral, the bilateral formula of individual layer, the bilateral alternating expression of individual layer; Multilayer unilateral, the bilateral formula of multilayer, the bilateral alternating expression of multilayer.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2006100324773A CN101174777B (en) | 2006-10-30 | 2006-10-30 | Insulation split joint type magnetic wedge with function of capturing leakage flux |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2006100324773A CN101174777B (en) | 2006-10-30 | 2006-10-30 | Insulation split joint type magnetic wedge with function of capturing leakage flux |
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| CN101174777A CN101174777A (en) | 2008-05-07 |
| CN101174777B true CN101174777B (en) | 2011-03-23 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101877507B (en) * | 2009-04-30 | 2013-10-23 | 石为民 | Super-wide load generator |
| CN112885594B (en) * | 2021-02-20 | 2022-08-05 | 浙江博菲电气股份有限公司 | Magnetic strip material prepared from magnetic conduction particles and preparation method |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB964175A (en) * | 1959-11-16 | 1964-07-15 | English Electric Co Ltd | Improvements in and relating to slot wedges for dynamo-electric machines |
| US4025840A (en) * | 1975-04-09 | 1977-05-24 | General Electric Company | Permanent magnet generator with output power adjustment by means of magnetic shims |
| CN1281281A (en) * | 1999-07-19 | 2001-01-24 | 陈启星 | Electric machine with magnetic cover on slot |
| CN1351404A (en) * | 2000-10-30 | 2002-05-29 | 陈启星 | Magnetic cover of slot on electric machine and method for improving electric machine design with it |
-
2006
- 2006-10-30 CN CN2006100324773A patent/CN101174777B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB964175A (en) * | 1959-11-16 | 1964-07-15 | English Electric Co Ltd | Improvements in and relating to slot wedges for dynamo-electric machines |
| US4025840A (en) * | 1975-04-09 | 1977-05-24 | General Electric Company | Permanent magnet generator with output power adjustment by means of magnetic shims |
| CN1281281A (en) * | 1999-07-19 | 2001-01-24 | 陈启星 | Electric machine with magnetic cover on slot |
| CN1351404A (en) * | 2000-10-30 | 2002-05-29 | 陈启星 | Magnetic cover of slot on electric machine and method for improving electric machine design with it |
Non-Patent Citations (3)
| Title |
|---|
| JP特开平5-276705A 1993.10.22 |
| JP特开平7-227053A 1995.08.22 |
| 陈启星等.绝缘拼接式磁性槽楔的结构和性能分析.《中小型电机》.2000,第27卷(第6期),第53-56页. * |
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