CN1281281A

CN1281281A - Electric machine with magnetic cover on slot

Info

Publication number: CN1281281A
Application number: CN 99115484
Authority: CN
Inventors: 陈启星
Original assignee: Individual
Current assignee: Individual
Priority date: 1999-07-19
Filing date: 1999-07-19
Publication date: 2001-01-24

Abstract

An electric machine with magnetic cover on open slot features that after the winding is embedded in the open slot of core, the open slot is closed by magnetic cover made of ferromagnetic or hypoferromagnetic material. Said magnetic cover has magnetic sleeve tube structure or thin magnetic wedge structure made of silicon sheets. Its advantages include high harmonic-suppressing effect, little leakage flux and high load power.

Description

Electric machine with magnetic cover on slot

The invention belongs to the invention of electric machine structure and manufacture view, is a kind of invention that becomes the configuration aspects of the groove motor of remaining silent behind magnetic sleeve or the thin magnetic layer magnetic slot-seal that the open slot motor is added.

In the design of electric machine structure, exist a pair of contradiction:, need notch good greatly a bit from the angle of wire insertion technology; From the angle of motor performance, need slot ripples little, promptly need notch littler good.Traditional magnetic slot-seal can make the equivalent width of notch diminish, it is a time-honored invention, but traditional magnetic slot-seal shortcoming is a lot, major defect is: magnetic slot-seal is communicated with the too thick and unreasonable structure of magnetic conduction part of adjacent two tooth magnetic circuits, bring many drawbacks, as: leakage field is excessive between notch, makes motor starting torque, breakdown torque decline and makes generator voltage regulation variation, and promptly carrying load ability descends; Reduce the slot wedge mechanical strength.

Practice and theoretical proof seal notch with magnetic material, many benefits are arranged, and some drawbacks are also arranged.The present invention adopts magnetic cover on slot sealing notch, so, which type of performance magnetic cover on slot should possess just can be brought into play maximum advantage and avoid its caused shortcoming should adopt the principle analysis of what method and structure according to motor again in order to realize these performances, magnetic cover on slot should possess following performance: 1, permeability height has enough magnetic fluxs to eliminate slot ripples to guarantee the notch place; 2, the between cog leakage field is little, and is few to guarantee invalid magnetic flux, and the carrying load ability of motor is guaranteed; 3, can cover notch fully, become the groove of remaining silent; 4, good insulating can not form big eddy current because of adopting magnetic cover on slot; 5, reliability height will guarantee the bond strength of the mechanical strength of magnetic cover on slot itself and it and electric machine iron core;

The objective of the invention is to realize above 5 performances, the structure of electric machine with magnetic cover on slot is proposed, make motor performance reach following effect: 1, to make high-rating generator and motor become the groove of remaining silent by open slot, raise the efficiency and the carrying load ability (carrying load ability of motor, for motor, refer to starting torque and breakdown torque; For generator, refer to voltage regulation); 2, according to the advantage optimal design motor again of the groove of remaining silent, such as, for motor, can cancel skewed slot and make the rotor slot-number ratio approach 1; For generator, can correspondingly reduce air gap, thereby reduce excitation loss, improve the efficient and the generate output of generator; 3, the motor of semi-open slot and semi-enclosed slot is all made the open slot rule, the groove of remaining silent operation, make wire insertion technology, quality, copper factor, the turn-to-turn insulation of motor all improve and not reduce its performance.For micro-machine, magnetic sleeve has enough intensity fixed coils, in order to replace slot wedge, reduces motor volume when improving performance; 4, for direct current machine, in order to improve commutation ability.

In order to narrate for simplicity, we arrange to give a definition and to be called for short.1. magnetic cover on slot: the general name of magnetic sleeve and thin magnetic wedge.2. notch magnetic layer: be used to seal the part of notch in magnetic cover on slot and the magnetic slot-seal, it is made up of magnetic material, seals into notch near the air gap face of cylinder of notch and with notch.3. ferromagnetic sheet: ferromagnetic material (as silicon steel sheet), ferrimagnetic material thin slice.4. thin magnetic wedge: thin notch magnetic layer magnetic slot-seal.5. insulation splicing: two splicings that ferromagnetic sheet is realized on the basis that guarantees insulation.6. left and right sides disjunction formula: from being that all thin magnetic wedge accompanying drawings of representative be it seems with Fig. 8, the Width of thin magnetic wedge is T, length direction is L, the notch magnetic layer of thin magnetic wedge (from over against Width) by about two about T/2 of width, length is structure and the method that the ferromagnetic sheet (17 and 18) of L adopts insulation to be spliced.In addition, the both sides of thin magnetic wedge, middle part, term such as top, following all are meant from over against (Fig. 8 class) width T direction.7. joint portion: the zone that the ferromagnetic sheet of two disjunctions is met.8. root 28: the abbreviation of notch magnetic layer root refers to the part of notch magnetic layer near both sides ferromagnetic sheet 16.9. middle part: refer in the notch magnetic layer and the equidistant center line part of both sides root, the normally joint portion of left and right sides disjunction formula notch magnetic layer both sides ferromagnetic sheet.10. shape of a saddle notch magnetic layer: root is thick, the notch magnetic layer of attenuation gradually toward the middle part.

Structure according to magnetic cover on slot can be divided into magnetic sleeve and thin magnetic wedge two classes, and it is the diagrammatic representation of same member under different occasions that mass part is arranged in the accompanying drawing, and this description of drawings all adopts unified label to this.1-magnetic lasso; The 2-magnetic sleeve; The 3-coil; The 4-notch; The 5-iron core teeth; The magnetic lasso of 6-band fixed teeth; The 7-fixed teeth; The magnetic sleeve of 8-band fixed teeth; 9-pushes down the slot wedge of fixed teeth; F-thin magnetic wedge or slot wedge; Stay hook on the 11-fixed teeth; 12-U shape fixed teeth; 13-segment ferromagnetic sheet; The 14-solder joint; 15-ferromagnetic sheet stay hook (in order to strengthen the bond strength of ferromagnetic sheet and resin matrix); The both sides that the 16-thin magnetic wedge is made of ferromagnetic sheet; 17-notch magnetic layer left half ferromagnetic sheet; 18-notch magnetic layer right half ferromagnetic sheet; 19-(Fig. 9) window; 20 and 21-window burr; 22-25 is that window connects tooth; 26-27 (Figure 10) inclined teeth; 28-(Fig. 8) notch magnetic layer root; 29-adds ferromagnetic sheet; 30-resin bonding additive; The buttonhole of 31-(Figure 12) perforation button; 32 and the buckle teeth of 33-perforation button; 34-(Figure 13) the right zigzag tooth; 35-left side zigzag tooth; 36-(Figure 14, Figure 15) stay hook; 37 and the 38-(button of Figure 16-Figure 19) limit; The concavo-convex ferromagnetic sheet of 39-(Figure 20); The chimb of the concavo-convex ferromagnetic sheet of 40-(Figure 21); The groove of the concavo-convex ferromagnetic sheet of 41-; 42-(Figure 23) ferromagnetic sheet groove; 43-ferromagnetic sheet chimb; The ferromagnetic sheet of the compound notch magnetic layer of 44-(Figure 25); 45 and 46-ferromagnetic sheet 44 on stay hook; The short ferromagnetic sheet of the compound notch magnetic layer of 47-(Figure 27); The high ferromagnetic sheet of the compound notch magnetic layer of 48-; 49-(Figure 28) is the ferromagnetic sheet splicing seams vertically; 50-(Figure 29) is the ferromagnetic sheet splicing seams vertically; Stay hook on the 51-ferromagnetic sheet; 52-ferromagnetic sheet side; The 53-integument.The thickness of d-notch magnetic layer root 28 or the thickness of

ferromagnetic sheet

17,18; K-magnetic sleeve width; T-width of rebate or thin magnetic wedge notch magnetic layer width; L-thin magnetic wedge length; W-adds the ferromagnetic sheet width; Ay-thin magnetic wedge faying face asterisk wildcard, expression faying face A1-A16.Detailed description of drawings combination principle declaratives and embodiment partly describe.

The present invention is called electric machine with magnetic cover on slot, is that a kind of open slot of motor the sealing with magnetic material becomes to remain silent the groove method and structure of (being called magnetic cover on slot), and optimizes and change the design of motor under magnetic cover on slot is supported.Magnetic cover on slot be magnetic sleeve and thin magnetic wedge two classes, it is characterized in that: 1. it is made by ferromagnetic sheet, the one side that is in air gap all is a ferromagnetic sheet, thereby realize the complete closed of ferromagnetic sheet to notch, guarantee that notch is a ferromagnetic material at the air gap place, its high permeability can provide enough magnetic fluxs to eliminate slot ripples; Ferromagnetic sheet cross section in the accompanying drawing is represented with heavy line.2. the fundamental type of its notch magnetic layer is an individual layer ferromagnetic sheet class, comprises that individual layer ferromagnetic sheet notch magnetic layer and individual layer ferromagnetic sheet are superimposed with the shape of a saddle notch magnetic layer that additional ferromagnetic sheet constitutes.Form the notch magnetic layer by the individual layer ferromagnetic sheet through insulation, splicing, bonding back, (for special large-size machine, because the notch broad, so its notch magnetic layer is corresponding thicker, the notch magnetic layer can develop into multilayer ferromagnetic sheet and compound ferromagnetic sheet by the individual layer ferromagnetic sheet); 3. the ferromagnetic sheet of the notch magnetic layer of individual layer ferromagnetic sheet class bottom curved surface is parallel to the air gap face of cylinder (compound notch magnetic layer is that magnetic layer integral body is parallel to the air gap face of cylinder), and covers the notch by air gap fully, makes motor become the groove of remaining silent; 4. the notch magnetic layer of magnetic cover on slot is thinner than the notch magnetic layer of traditional magnetic slot-seal, because notch magnetic layer of the present invention is made of ferromagnetic sheet, and the thickness of ferromagnetic sheet is easy to control, so control the thickness of notch magnetic layer by the thickness of control ferromagnetic sheet.The thickness d of notch ferromagnetic sheet (marking in Fig. 1 and Fig. 8) is a critical data, should be determined by experiment data.The ferromagnetic sheet thickness d can not be too thick, too thickly causes that then the gear tip clearance leakage field is excessive, can produce adverse effects such as carrying load ability reduction; Can not be too thin, too thinly then can't provide enough magnetic fluxs, the effect of eliminating slot ripples is not obvious.The thickness of ferromagnetic sheet should be to eliminate slot ripples, can not produce big between cog leakage field again and be advisable.When material one timing, in order to guarantee to suppress effectively slot ripples, root thickness d increases along with the increase of width of rebate usually, and promptly root thickness d is the increasing function of width of rebate T.In order to illustrate that root thickness d is the increasing function of width of rebate T, provides estimation equation for your guidance: d=G*B _δ* (T-2*e)/(2*B _s), d is a notch magnetic layer root thickness in the formula, B _δBe air gap flux density, T is a width of rebate, and e is for strengthening the thickness of tooth, B _sBe the saturation magnetic induction of magnetic material, G is a correction factor; 5. disjunction formula and packaging type insulation system.For fear of big eddy current, magnetic cover on slot is made of a plurality of ferromagnetic sheet members, mutual insulating between each ferromagnetic sheet member, and mutual insulating between magnetic cover on slot and the iron core teeth, these two kinds of insulation will guarantee a kind of at least reliably, in the hope of avoiding big eddy current.Between each magnetic lasso of magnetic sleeve class and insulate between magnetic sleeve and the iron core; Thin magnetic wedge is with a plurality of ferromagnetic sheet member splicings and bonding forming, and locates to have guaranteed insulation at joint portion Ay (Ay has represented A1 to A16), thereby better insulation effect is arranged.Fig. 8 represented by about splicing of two (also can be polylith) ferromagnetic sheets and the bonding thin magnetic wedge that forms; The joint portion Ay of two ferromagnetic sheets is close to formula mutually, also can be the clearance-type that leaves some distances mutually.Among Figure 28, each ferromagnetic sheet is the composition thin magnetic wedge that interosculates of the length direction along slot wedge; Can also make outer wrap insulate layer and core insulation by a ferromagnetic sheet member (Figure 31).6. for guaranteeing the mechanical strength and the operational reliability of magnetic cover on slot itself, large-sized magnetic sleeve adopts fixed teeth and notch is bonding, chucking; The intensity of thin magnetic wedge guarantees problem, and (is the overall description of thin magnetic wedge with Fig. 8) is characterized in that the ferromagnetic sheet of thin magnetic wedge adopts the structure and the method for insulation splicing (i.e. splicing mutually under the insulation prerequisite).Under the insulation prerequisite, the ferromagnetic sheet of disjunction is combined into the integral body that sufficient mechanical strength is arranged.The ferromagnetic sheet member of left and right sides disjunction adopts the insulation splicing, a joint portion Ay is all arranged, for guaranteeing splicing and bonding reliability, not only to carry out insulation processing and bonding to joint portion Ay, and should adopt the provision to strengthen splicing with adhesive effect to joint portion Ay, its measure is too numerous to enumerate, as: roughened, snap fastener (Figure 16), perforation button (Figure 12), staggered interlock (Figure 13, Figure 10), overlap joint (Figure 11), nested (Figure 21, Figure 23), some measures among fixed teeth (Figure 19) and Fig. 9, as: windowing, make and connect tooth, adopt intercommunicating pore, (these measures will describe in detail) cooperates the bonding reliable splicing that just can realize joint portion Ay and bonding with above measure.More than the characteristics of splicing measure are exactly to guarantee two insulation between the splice, thus below be referred to as insulation splicing.In the present invention, before bonding faying face being carried out roughened is a kind of general measure, not repeated description.

Further aspect of the present invention is the structure of magnetic cover on slot and the main technique of manufacturing.For the magnetic sleeve class, its sleeve thickness, width and reliability there is requirement.Magnetic sleeve is made by ferromagnetic sheet.From the angle of motor performance, at first, the thickness d of magnetic sleeve is a critical data.Secondly, eddy current also is a significant data, and the width K of each ring can not be too wide, and too wide then eddy current is too big, but too narrow then manufacturability is poor.Different according to motor type and specification, thickness is between 0.2-8mm, and width will be taken all factors into consideration the service behaviour and the manufacturability of motor between 0.3-20mm, determine the width and the thickness data of magnetic lasso according to experiment.Several are combined into magnetic sleeve 2 by the magnetic lasso 1 of Fig. 1 then, magnetic sleeve 2 is enclosed within the inner surface of the stator core 5 of Fig. 2, the notch that stays owing to rule circle 3 in the stator 4 is sealed by ferromagnetic sheet, make iron core 5 inner surfaces become the smooth surface that constitutes by ferromagnetic material of Fig. 3 shape, promptly become the groove of remaining silent, become the magnetic sleeve-type groove motor of remaining silent, make original because the slot ripples that notch 4 caused is suppressed.For stator, it is long that the outer circumference of magnetic sleeve annulus equals the stator inner periphery, and its tight fit is nested in the stator internal circular surfaces.For rotor, magnetic sleeve is the outer surface that is enclosed within rotor core, and available magnetic sleeve hoop is enclosed within rotor surface, also can be with the winding method with the silicon steel silk tightly around rotor surface, rotor packages behind the magnetic sleeve not necessarily circular.Nested and twine before carry out roughened coat again bonding agent can strengthen the performance that the magnetic sleeve anti-vibration comes off and the ring that produces magnetic sleeve and encircle between and insulating effect between the ring and the iron core flank of tooth.In order to improve the reliability that magnetic sleeve combines with iron core, it is not enough depending bonding method alone, and the following two kinds of methods that have that large and medium-sized motor is suitable for improve reliability: 1, adopt the method for welding (as electric resistance welding) that magnetic sleeve and iron core are welded as a whole; 2, adopt the magnetic sleeve of band fixed teeth, band tooth magnetic sleeve 8 among Fig. 4 is made up of the magnetic lasso 6 of one group of band fixed teeth 7, the fixed teeth of burn-oning on magnetic lasso 17 has just become magnetic lasso 6, during assembling, position according to Fig. 5 is inserted in fixed teeth 7 in the notch 4, coat bonding agent, insert non magnetic slot wedge F then and fixed teeth 7 is pushed down cemented, make the magnetic sleeve 8 and reliable combination of iron core 5 realizations of band fixed teeth as 9.(in the thin magnetic wedge explanation, the F among Fig. 5 is expressed as thin magnetic wedge.)

Several basic structures and the technology of magnetic sleeve are as follows:

Describe earlier the most basic a kind of structure, the magnetic sleeve 2 of Fig. 1 is made up of one group of magnetic lasso 1, magnetic lasso 1 be one by the annulus made from ferrimagnet (as silicon steel).First ferromagnetic rectangular (certainly, the silicon steel silk in circular section and other cross section is also at the row of protection) of the wide K of prefabricated a kind of thick d, then by the Len req shearing, be welded into ring.The thickness d of annulus should be determined by experiment.The estimation equation of thickness d is: d=G*B _δ* (T-2*e)/(2*B _s).For micro-machine, the thickness of ring should be thinner, can adopt the thickness (as 0.35mm or 0.5mm) of existing silicon steel sheet, and silicon steel sheet is cut into the rectangular ring that is welded into again later.Then need to be customized to thick (as 0.5mm-8mm) silicon steel bar for the big motor of width of rebate, it is following for well that width K is controlled at 20mm, is welded into ring again, ring with encircle between insulate.Have from the angle of motor performance, ring width is the smaller the better, and half of the iron core facewidth that should be not more than stator is more reasonable, and wideer also passable if emphasize technological words certainly in order to avoid the eddy current of anchor ring is too big, just its eddy current loss is bigger than normal.

Further aspect of the present invention is to adopt the magnetic sleeve 8 of band fixed teeth 7 to guarantee the reliable connection of magnetic sleeve and iron core.For large and medium-sized motor, what be suitable for is the magnetic sleeve 8 of the band fixed teeth 7 of Fig. 4.The method of making fixed teeth is varied, and welding is a kind of good method.Exemplify two kinds of magnetic sleeves as Fig. 6, Fig. 7 and formed the method for being with fixed teeth 7, method one: (Fig. 6) on the basis of smooth magnetic lasso 1 according to iron core teeth apart from the welding fixed teeth 7, can be that one section metal 12 is welded into two teeth and is a U-shaped and becomes two teeth, also can be welded into a

tooth

7,11 is the stay hook on the fixed teeth 7, it makes fixed teeth 7 better at the tension fixed effect of notch, only drawing among Fig. 6 has stay hook 11 on the tooth, the hook 11 that can fix on each fixed teeth that yes can not done yet.The 14th, solder joint.Method two: (Fig. 7) be welded into the magnetic lasso 6,14th that (among Fig. 4) is with fixed teeth 7 with many segment ferromagnetic sheets 13 according to the iron core teeth distance, solder joint, each ferromagnetic sheet 13 are reserved a joint 7 as fixed teeth.The manufacture method of the fixed teeth 7 of magnetic lasso 6 can be any welding method, and electric resistance welding is both economical.Can certainly be with other forming method.Fixed teeth not necessarily each notch is all wanted.Smooth magnetic sleeve among Fig. 1 also can directly be welded on the iron core, makes iron core notch closure.

Further aspect of the present invention is that the notch magnetic layer ferromagnetic sheet of thin magnetic wedge has adopted left and right sides disjunction structure, and promptly (referring to Fig. 5, from the direction of Fig. 5, the ferromagnetic sheet disjunction of slot wedge F is left and right sides two parts or many parts in the circumferencial direction disjunction.The enlarged drawing of slot wedge F is exactly Fig. 8, and left and right sides disjunction is exactly the direction disjunction at width T), adopt insulation splicing be combined into then, hereinafter to be referred as left and right sides disjunction formula.Adopt left and right sides disjunction formula ferromagnetic sheet can not cause the iron core teeth short circuit of the right and left to guarantee thin magnetic wedge.Fig. 8 is the self-contained figure of left and right sides disjunction formula thin magnetic wedge, and slot wedge is by left and right sides two parts be combined into, and thick black line is the cross section of ferromagnetic sheet in institute's drawings attached, and the ferromagnetic sheet bottom of left half is 17, and the ferromagnetic sheet bottom of right half is 18.The ferromagnetic sheet gross thickness of notch magnetic layer root 28 (Fig. 8, Figure 19) equals d.Left and right sides two parts ferromagnetic sheet adopts the insulation splicing, its joint portion be Ay (the faying face Ay among Fig. 8 broadly represented subsequent figures various about the faying face A1-A16 of insulation splicing type), Ay takes insulation measures in the joint portion, make left and right sides ferromagnetic sheet insulation, even thin magnetic wedge ferromagnetic sheet side 16 and (Fig. 5) between the iron core teeth 5 insulation unreliable, also the insulation owing to faying face Ay has guaranteed to avoid adjacent two teeth owing to using thin magnetic wedge to produce short circuit, to prevent to produce maelstrom.Two ferromagnetic sheets can be to be close to formula mutually at joint portion Ay, also can be the clearance-types that leaves some distances mutually, are separated to reduce leakage field by resin bed between face that interosculates and face.15 is stay hook, and 30 are resin extender (resin extender 30 all should be arranged in the thin magnetic wedge, but all resin extender 30 is not drawn in the thin magnetic wedge accompanying drawing afterwards).

To be the notch magnetic layer be superimposed with additional ferromagnetic sheet by individual layer ferromagnetic sheet or individual layer ferromagnetic sheet to further aspect of the present invention constitutes, and its bottom

ferromagnetic sheet

17 and 18 bottom surface the one side of air gap (promptly by) is parallel to the air gap face of cylinder, forms left and right sides disjunction formula structure thin magnetic wedge.The ferromagnetic sheet of disjunction adopts the structure and the method for insulation splicing (i.e. splicing mutually under the insulation prerequisite).Under the insulation prerequisite, the measure of employing increase thin magnetic wedge intensity is combined into the integral body that sufficient mechanical strength is arranged with the ferromagnetic sheet of disjunction.

The thin magnetic wedge of Fig. 8 has been represented the general assembly drawing of the left and right sides disjunction class thin magnetic wedge of Fig. 9 to Figure 19, and the ferromagnetic sheet 17 on its left side and ferromagnetic sheet 18 members on the right are adopted the insulation splicing, and filling resin extender 30, becomes a thin magnetic wedge integral body.This class thin magnetic wedge can be the notch magnetic layer that the individual layer ferromagnetic sheet constitutes, it also can be shape of a saddle notch magnetic layer, shape of a saddle notch magnetic layer has two kinds of structures (Figure 19): 1. be superimposed with several layers of additional ferromagnetic sheet 29 by bedding iron

magnetic sheet

17 and 18, additional ferromagnetic sheet is close to root, following additional ferromagnetic sheet is wide, narrow more above past more, form root thick and toward the middle part shape of a saddle notch magnetic layer of attenuation gradually.2. can also be that ferromagnetic sheet is made the thick past middle part of the root horse-saddle of attenuation gradually.The notch magnetic layer of Fig. 9 to Figure 18 has only been drawn the individual layer ferromagnetic sheet, can be shape of a saddle notch magnetic layer in fact.No matter be which kind of notch magnetic layer, the ferromagnetic sheet gross thickness of its root 28 equals d,

ferromagnetic sheet

17 and 18 both in joint portion Ay place's combination, joint portion 16 is the side of thin magnetic wedge ferromagnetic sheet, 15 is fixed teeth (in order to strengthen the bond strength of ferromagnetic sheet and resin matrix), this class thin magnetic wedge all has a joint portion Ay, for guaranteeing splicing and bonding reliability, not only to carry out insulation processing and bonding to joint portion Ay, and should adopt the provision to strengthen splicing with adhesive effect to joint portion Ay, its measure is too numerous to enumerate, as: roughened, snap fastener (Figure 16), perforation button (Figure 12), staggered interlock (Figure 13, Figure 10), overlap joint (Figure 11), nested (Figure 17-Figure 20), some measures among fixed teeth (Figure 19) and Fig. 9, as: windowing, make and connect tooth, adopt intercommunicating pore, (these measures will describe in detail) cooperates the bonding reliable splicing that just can realize joint portion Ay and bonding with above measure.More than the characteristics of splicing measure are exactly to guarantee two insulation between the splice, thus below be referred to as insulation splicing, method is too numerous to enumerate, only lifts several.

The thin magnetic wedge that Fig. 9-Figure 19 represents all is that individual layer ferromagnetic sheet or individual layer ferromagnetic sheet are superimposed with the left and right sides disjunction formula insulation that additional ferromagnetic sheet constitutes.The difficulty owing to draw, some explanation is arranged: the individual layer ferromagnetic sheet notch magnetic layer that 1. only draws must comprise two breeds of horses saddle type notch magnetic layer in fact.2. on ferromagnetic sheet and additional ferromagnetic sheet, do some fixed teeth or perforation button, strengthen bond strength.This class thin magnetic wedge by about splicing of two blocks of ferromagnetic sheet members and bonding forming, insulate between each ferromagnetic sheet member, can not make circle generation maelstrom in the iron core later on so guaranteed the insertion thin magnetic wedge.The skin that adds two inclined-planes 16 of thin magnetic wedge is coated between insulating barrier and the iron core and is insulated, and just can avoid maelstrom more reliably.

The left and right sides ferromagnetic sheet of Fig. 9 takes the shape of the letter U, and joint portion A1 is by bonding the forming of vertical faying face A1 of two ferromagnetic sheets.In order to guarantee the adhesive strength of joint portion, adopt following measure to be used: open to connect window 19 and make at two bonding planes and is connected

tooth

20,21,22,23,24,25, the connection tooth is inserted in the other side's the window with the reinforcement bonding strength.The position and the shape that connect tooth can be any, can be burrs 20,21, and burr 20 is nested in 21, also can be the

window lobate

22 and 24 that is parallel to the base, the window lobate 23 that is perpendicular to the base with 25 and other angle and shape be connected tooth.Certainly, window can develop into and be out some corresponding holes 19 purely, and resin connects left and right sides ferromagnetic sheet, can strengthen bond strength; The 15th, faying face A go up and the side 16 of thin magnetic wedge ferromagnetic sheet on stay hook, only drawn one side, both sides can be done.

Figure 10 is the thin magnetic wedge of alternating expression adhesive surface.Among Figure 10, the staggered of left and right sides ferromagnetic sheet has several sections teeth directional left banks in conjunction with tooth 26, in addition several sections teeth directional right bank.To strengthen the two-part intensity in the bonding left and right sides of bonding plane A2.

Figure 11 is the thin magnetic wedge of alternating expression fixed teeth.

Ferromagnetic sheet

17 and 18 has many fixed teeth 27 at joint portion A3 place, reaches the other side's ferromagnetic sheet top mutually, forms the situation of staggered fixed teeth, has strengthened intensity and ferromagnetic sheet and the resin material high base strength of joint portion A3.

Figure 12 a is the notch magnetic layer of perforation button splicing, make some buckle teeth 32,33 on the ferromagnetic sheet base 17 on the left side, make some buttonholes 31 on the ferromagnetic sheet base 18 on the right, the buckle teeth 32 and 33 on base 17 passes behind the buttonhole 31 on base 18 curved to leaning now to one side, then to the other again, the right and left ferromagnetic sheet is snapped into together, form the joint portion A4 of perforation button, promptly become the thin magnetic wedge of Figure 12 structure.When 17 and 18 for a long time overlapping, the notch magnetic layer of this structure is become double-deck by individual layer.

Figure 12 a dispenses the perforation button and just develops into Figure 12 b employing notch magnetic layer of overlap mode up and down, top notch magnetic layer 18 and following notch magnetic layer 17 bonding plane A4 are individual layer notch magnetic layers when narrower, develop into double-deck notch magnetic layer during bonding plane A4 broad.

Figure 13 is staggered biting connecions splicing, and the ferromagnetic sheet on both sides is done some staggered tooth engaged 34,35, and the tooth engaged of the right and left ferromagnetic sheet is staggered up and down mutually.Tooth engaged 34 on the ferromagnetic sheet base 18 on the right be positioned at tooth engaged on the ferromagnetic sheet base 17 on the left side above, faying face is A5, the sectional view of this part is Figure 14; Above the tooth engaged on the ferromagnetic sheet base 18 on the right of tooth engaged 35 on the ferromagnetic sheet base 17 on the left side is positioned at, faying face is A6, and the sectional view of this part is Figure 15.Among Figure 14 and Figure 15, also have a fixed teeth 36 above the tooth engaged 34,35, make ferromagnetic sheet more reliable with combining of resin matrix.There is not fixed teeth 36 to be among Figure 13 because bad picture.Also having, among many figure, fixed teeth 15 is arranged on the ferromagnetic sheet on the left side and do not have on the ferromagnetic sheet on the right, also is because bad picture, and tooth in fact all should fix.

Tooth engaged 34 among Figure 13 is toward upwarping an angle, leave pressed 17 on tooth engaged, same, tooth engaged 35 is toward upwarping an angle, leave pressed 18 on tooth engaged, just left a bit of distance between the

ferromagnetic sheet base

17 and 18, become gapped joint portion.

The joint portion A7 of Figure 16 is formed by the button limit 37 of left and right sides ferromagnetic sheet and 38 snap fasteners, and is very firm.

In fact Figure 17 and Figure 18 are exactly the distortion of the snap fastener formula thin magnetic wedge of Figure 16, and different snapping modes is made on button limit 37 and 38.In fact also can regard as to have developed into to nested mode and change, 37 is chimb, and 38 is concave edge.A8, A9 are the faying face of various difformities and different parts (root or middle part), and this can't be exhaustive.

The left and right sides ferromagnetic sheet of Figure 19 has a bit of gap to form big magnetic resistance at joint portion A10 place, reduces the between cog leakage field.Its shape of a saddle notch magnetic layer has two kinds of structures: 1. be superimposed with several layers of additional ferromagnetic sheet 29 by bedding iron

magnetic sheet

17 and 18, additional ferromagnetic sheet is close to root, additional ferromagnetic sheet width W 2＜W1＜T/2, length=L, promptly Xia Mian additional ferromagnetic sheet is wide, narrow more above past more, form root thick and toward the middle part shape of a saddle notch magnetic layer of attenuation gradually.2. can also be that ferromagnetic sheet is made root is thick and toward the middle part horse-saddle of attenuation gradually.The ferromagnetic sheet gross thickness of its root 28 equals d.Additional ferromagnetic sheet can be a multilayer.At notch magnetic layer middle part,

ferromagnetic sheet

17 and 18 is done some fixed teeth 15.

Further aspect of the present invention is structure and the method that thin magnetic wedge splices to the insulation of multilayer ferromagnetic sheet structure and the differentiation of compound ferromagnetic sheet from individual layer ferromagnetic sheet class, and method is too numerous to enumerate, only lifts several.

In the thin magnetic wedge structure of Figure 12 a, Figure 12 b and Figure 13, the many more notch magnetic layers that just are equivalent to double-deck ferromagnetic sheet more of the ferromagnetic sheet lap of notch magnetic layer part.

Figure 20 is that Figure 19 develops and the notch magnetic layer of the multi-sheet structure that comes.Middle ferromagnetic sheet 39 while be recessed be protruding, be nested among chimb 37 and the concave edge 38.

Figure 20 further develops the nested type notch magnetic layer that becomes Figure 21.Among Figure 21 nested constitutes (exploded view is Figure 22) by chimb 40 and concave edge 41, becomes 4 layers of notch magnetic layer that ferromagnetic sheet is thick, and notch magnetic layer thickness is d.

The notch magnetic layer of Figure 18 further develops the nesting type structure that becomes Figure 23.Chimb is 43, and concave edge is 42, and rabbet is the dovetail groove type structure, has guaranteed high bond strength after nested.Figure 23 further develops the multiple-piece structure that becomes Figure 24, is that chimb is 43 equally, and concave edge is 42, and the notch magnetic layer has become composite structure, and thickness all is d.

When each element of the nested combined type notch magnetic layer of Figure 23 saves tongue and groove, become the ferromagnet sheet 44 bonding combined type notch magnetic layers that form of a picture group 25 structures, thickness still is d.In order to improve the reliability that combines of ferromagnetic sheet 44 and resin matrix, more prefabricated

fixed teeth

45 and 46 on (among Figure 26)

ferromagnetic sheet

44,45 and 46 are produced on the diverse location on 44, and the

stain

45 and 46 among Figure 25 has been represented fixed teeth in different positions, and A15 is a faying face.The combined type notch magnetic layer of Figure 25 develops into the compound notch magnetic layer that the lamination of the high ferromagnetic sheet 48 of Figure 27 and short ferromagnetic sheet 47 alternating expressions is formed, and faying face is d for A16 thickness.

Further aspect of the present invention is a thin magnetic wedge in direction disjunction formula (ferromagnetic sheet that is about to thin magnetic wedge is divided into several sections in the length L direction) insulation system and method along rotating shaft, avoids forming big loop, to prevent to produce maelstrom.

The ferromagnetic sheet of the thin magnetic wedge of Figure 28 is vertically (be motor axially) disjunction, in fact is exactly by magnetic sleeve 8 differentiation of the band fixed teeth of Fig. 4.The 49th, the bonding crack between the ferromagnetic sheet, can be like the floor tile one bonding near one be close to, also can be to laminate one section, bonding mutually and insulation between every mutually like the cover tile.Every ferromagnetic sheet in vertical shortening, in the direction increase of notch magnetic layer thickness d, is just become the vertical stacked compound notch magnetic layer of Figure 29.50 is the lamination adhesive portion, and 51 is fixed teeth, fixed teeth 45 among similar Figure 26 and 46 fixed teeth.

The compound use feasible structure that yes should protect of left and right sides disjunction and vertical disjunction.

Further aspect of the present invention is the packaging type insulation system and the method for thin magnetic wedge, to prevent to produce maelstrom.

Thin magnetic wedge can also be made by a ferromagnetic sheet member, is the simplest thin magnetic wedge structure that is processed into silicon steel sheet as Figure 30, the adding resin extender.17 is the notch magnetic layer, and 16 is two trapezoidal sides of slot wedge, though this structure is simple, but shortcoming clearly, that is exactly as long as side 16 and iron core teeth short circuit then can produce the eddy current in big loop, so will pay special attention to the insulating barrier reliability of side 16 and iron core.The thin magnetic wedge ferromagnetic sheet side 16 of Figure 30 is inwardly shunk, and skin is wrapped up by resin material 53, forms the structure of Figure 31 of insulating barrier and core insulation.The notch magnetic layer also can superpose some additional ferromagnetic sheets forming the shape of a saddle, can also its ferromagnetic sheet upward some teeth of punching press strengthen the reliability that combines of ferromagnetic sheet and resin matrix as fixed teeth 15.

Further aspect of the present invention is owing to can produce favourable influence to the electromagnetic property of motor after adding magnetic cover on slot, so can be optimized design again to the structure of motor, motor performance is produced the influence of having a mind to.

In the design of electrical motor, the purpose that the design of design of employing skewed slot and rotor slot-number ratio and more groove number design is to suppress slot ripples, because magnetic cover on slot has suppressed slot ripples, so the design of design of the skewed slot of motor and rotor slot-number ratio and more groove number design just can be rethought, as long as suppressed slot ripples fully, just can reduce angle of bevel or cancellation skewed slot; The rotor slot-number ratio is approached or equal 1; Suitably reduce air gap; Thereby reduce loss, improve the efficient and the capacity of generator and motor.

Further aspect of the present invention is owing to can produce favourable influence to the electromagnetic property of motor after adding magnetic cover on slot, so can be optimized design again to the structure of motor, electric machine structure and technology is produced wholesome effect.

For the motor of semi-enclosed slot and semi-open slot, can all change and be designed to open slot, help rule, improve copper factor and rule quality.In the design of electrical motor, increasing the groove number is because suppressed slot ripples, then can correspondingly reduce the groove number and simplify technology the many motors of groove number.

Magnetic sleeve is actually one deck steel bushing, and for micro-machine, the intensity of magnetic sleeve can play the effect that stops embedded coil to run out of notch, so can attenuate slot wedge even cancellation slot wedge.

Claims

1, the present invention is called electric machine with magnetic cover on slot, is that a kind of open slot of motor the sealing with magnetic material becomes to remain silent the groove method and structure of (being called magnetic cover on slot), and optimizes and change the design of motor under magnetic cover on slot is supported.Magnetic cover on slot be magnetic sleeve and thin magnetic wedge two classes, it is characterized in that: 1. it is made by ferromagnetic sheet, the one side that is in air gap all is a ferromagnetic sheet, thereby realize the complete closed of ferromagnetic sheet to notch, guarantee that notch is a ferromagnetic material at the air gap place, its high permeability can provide enough magnetic fluxs to eliminate slot ripples; Ferromagnetic sheet cross section in the accompanying drawing is represented with heavy line.2. the fundamental type of its notch magnetic layer is an individual layer ferromagnetic sheet class, comprises that individual layer ferromagnetic sheet notch magnetic layer and individual layer ferromagnetic sheet are superimposed with the shape of a saddle notch magnetic layer that additional ferromagnetic sheet constitutes.Form the notch magnetic layer by the individual layer ferromagnetic sheet through insulation, splicing, bonding back, (for special large-size machine, because the notch broad, so its notch magnetic layer is corresponding thicker, the notch magnetic layer can develop into multilayer ferromagnetic sheet and compound ferromagnetic sheet by the individual layer ferromagnetic sheet); 3. the ferromagnetic sheet of the notch magnetic layer of individual layer ferromagnetic sheet class bottom curved surface is parallel to the air gap face of cylinder (compound notch magnetic layer is that magnetic layer integral body is parallel to the air gap face of cylinder), and covers the notch by air gap fully, makes motor become the groove of remaining silent; 4. the notch magnetic layer of magnetic cover on slot is thinner than the notch magnetic layer of traditional magnetic slot-seal, because notch magnetic layer of the present invention is made of ferromagnetic sheet, and the thickness of ferromagnetic sheet is easy to control, so control the thickness of notch magnetic layer by the thickness of control ferromagnetic sheet.The thickness d of notch ferromagnetic sheet (marking in Fig. 1 and Fig. 8) is a critical data, should be determined by experiment data.The ferromagnetic sheet thickness d can not be too thick, too thickly causes that then the gear tip clearance leakage field is excessive, can produce adverse effects such as carrying load ability reduction; Can not be too thin, too thinly then can't provide enough magnetic fluxs, the effect of eliminating slot ripples is not obvious.The thickness of ferromagnetic sheet should be to eliminate slot ripples, can not produce big between cog leakage field again and be advisable.When material one timing, in order to guarantee to suppress effectively slot ripples, root thickness d increases along with the increase of width of rebate usually, and promptly root thickness d is the increasing function of width of rebate T.In order to illustrate that root thickness d is the increasing function of width of rebate T, provides estimation equation for your guidance: d=G*B _δ* (T-2*e)/(2*B _s), d is a notch magnetic layer root thickness in the formula, B _δBe air gap flux density, T is a width of rebate, and e is for strengthening the thickness of tooth, B _sBe the saturation magnetic induction of magnetic material, G is a correction factor; 5. disjunction formula and packaging type insulation system.For fear of big eddy current, magnetic cover on slot is made of a plurality of ferromagnetic sheet members, mutual insulating between each ferromagnetic sheet member, and mutual insulating between magnetic cover on slot and the iron core teeth, these two kinds of insulation will guarantee a kind of at least reliably, in the hope of avoiding big eddy current.Between each magnetic lasso of magnetic sleeve class and insulate between magnetic sleeve and the iron core; Thin magnetic wedge is with a plurality of ferromagnetic sheet member splicings and bonding forming, and locates to have guaranteed insulation at joint portion Ay (Ay has represented A1 to A16), thereby better insulation effect is arranged.Fig. 8 represented by about splicing of two (also can be polylith) ferromagnetic sheets and the bonding thin magnetic wedge that forms; The joint portion Ay of two ferromagnetic sheets is close to formula mutually, also can be the clearance-type that leaves some distances mutually.Among Figure 28, each ferromagnetic sheet is the composition thin magnetic wedge that interosculates of the length direction along slot wedge; Can also make outer wrap insulate layer and core insulation by a ferromagnetic sheet member (Figure 31).6. for guaranteeing the mechanical strength and the operational reliability of magnetic cover on slot itself, large-sized magnetic sleeve adopts fixed teeth and notch is bonding, chucking; The intensity of thin magnetic wedge guarantees problem, and (is the overall description of thin magnetic wedge with Fig. 8) is characterized in that the ferromagnetic sheet of thin magnetic wedge adopts the structure and the method for insulation splicing (i.e. splicing mutually under the insulation prerequisite).Under the insulation prerequisite, the ferromagnetic sheet of disjunction is combined into the integral body that sufficient mechanical strength is arranged.The ferromagnetic sheet member of left and right sides disjunction adopts the insulation splicing, a joint portion Ay is all arranged, for guaranteeing splicing and bonding reliability, not only to carry out insulation processing and bonding to joint portion Ay, and should adopt the provision to strengthen splicing with adhesive effect to joint portion Ay, its measure is too numerous to enumerate, as: roughened, snap fastener (Figure 16), perforation button (Figure 12), staggered interlock (Figure 13, Figure 10), overlap joint (Figure 11), nested (Figure 21, Figure 23), some measures among fixed teeth (Figure 19) and Fig. 9, as: windowing, make and connect tooth, adopt intercommunicating pore, (these measures will describe in detail) cooperates the bonding reliable splicing that just can realize joint portion Ay and bonding with above measure.More than the characteristics of splicing measure are exactly to guarantee two insulation between the splice, thus below be referred to as insulation splicing.In the present invention, before bonding faying face being carried out roughened is a kind of general measure, not repeated description.

2, electric machine with magnetic cover on slot structure according to claim 1, its further feature are the structure of magnetic cover on slot and the main technique of manufacturing.For the magnetic sleeve class, its sleeve thickness, width and reliability there is requirement.Magnetic sleeve is made by ferromagnetic sheet.From the angle of motor performance, at first, the thickness d of magnetic sleeve is a critical data.Secondly, eddy current also is a significant data, and the width K of each ring can not be too wide, and too wide then eddy current is too big, but too narrow then manufacturability is poor.Different according to motor type and specification, thickness is between 0.2-8mm, and width will be taken all factors into consideration the service behaviour and the manufacturability of motor between 0.3-20mm, determine the width and the thickness data of magnetic lasso according to experiment.Several are combined into magnetic sleeve 2 by the magnetic lasso 1 of Fig. 1 then, magnetic sleeve 2 is enclosed within the inner surface of the stator core 5 of Fig. 2, the notch that stays owing to rule circle 3 in the stator 4 is sealed by ferromagnetic sheet, make iron core 5 inner surfaces become the smooth surface that constitutes by ferromagnetic material of Fig. 3 shape, promptly become the groove of remaining silent, become the magnetic sleeve-type groove motor of remaining silent, make original because the slot ripples that notch 4 caused is suppressed.For stator, it is long that the outer circumference of magnetic sleeve annulus equals the stator inner periphery, and its tight fit is nested in the stator internal circular surfaces.For rotor, magnetic sleeve is the outer surface that is enclosed within rotor core, and available magnetic sleeve hoop is enclosed within rotor surface, also can be with the winding method with the silicon steel silk tightly around rotor surface, rotor packages behind the magnetic sleeve not necessarily circular.Nested and twine before carry out roughened coat again bonding agent can strengthen the performance that the magnetic sleeve anti-vibration comes off and the ring that produces magnetic sleeve and encircle between and insulating effect between the ring and the iron core flank of tooth.In order to improve the reliability that magnetic sleeve combines with iron core, it is not enough depending bonding method alone, and the following two kinds of methods that have that large and medium-sized motor is suitable for improve reliability: 1, adopt the method for welding (as electric resistance welding) that magnetic sleeve and iron core are welded as a whole; 2, adopt the magnetic sleeve of band fixed teeth, band tooth magnetic sleeve 8 among Fig. 4 is made up of the magnetic lasso 6 of one group of band fixed teeth 7, the fixed teeth of burn-oning on magnetic lasso 17 has just become magnetic lasso 6, during assembling, position according to Fig. 5 is inserted in fixed teeth 7 in the notch 4, coat bonding agent, insert non magnetic slot wedge F then and fixed teeth 7 is pushed down cemented, make the magnetic sleeve 8 and reliable combination of iron core 5 realizations of band fixed teeth as 9.(in the thin magnetic wedge explanation, the F among Fig. 5 is expressed as thin magnetic wedge.)

Several basic structures and the technology of magnetic sleeve are as follows:

Describe earlier the most basic a kind of structure, the magnetic sleeve 2 of Fig. 1 is made up of one group of magnetic lasso 1, magnetic lasso 1 be one by the annulus made from ferrimagnet (as silicon steel).First ferromagnetic rectangular (certainly, the silicon steel silk in circular section and other cross section is also at the row of protection) of the wide K of prefabricated a kind of thick d, then by the Len req shearing, be welded into ring.The thickness d of annulus should be determined by experiment.The estimation equation of thickness d is: d=G*B _δ* (T-2*e)/(2*B _s).For micro-machine, the thickness of ring should be thinner, can adopt the thickness (as 0.35mm or 0.5mm) of existing silicon steel sheet, and silicon steel sheet is cut into the rectangular ring that is welded into again later.Then need to be customized to thick (as 0.5mm-8mm) silicon steel bar for the big motor of width of rebate, it is following for well that width K is controlled at 20mm, is welded into ring again, ring with encircle between insulate.From the angle of motor performance, ring width is the smaller the better, and half of the iron core facewidth that should be not more than stator is more reasonable, and wideer also passable if emphasize technological words certainly in order to avoid the eddy current of anchor ring is too big, just its eddy current loss is bigger than normal.

3, according to the structure of claim 1,2 described magnetic cover on slot, its further feature is to adopt the magnetic sleeve 8 of band fixed teeth 7 to guarantee the reliable connection of magnetic sleeve and iron core.For large and medium-sized motor, what be suitable for is the magnetic sleeve 8 of the band fixed teeth 7 of Fig. 4.The method of making fixed teeth is varied, and welding is a kind of good method.Exemplify two kinds of magnetic sleeves as Fig. 6, Fig. 7 and formed the method for being with fixed teeth 7, method one: (Fig. 6) on the basis of smooth magnetic lasso 1 according to iron core teeth apart from the welding fixed teeth 7, can be that one section metal 12 is welded into two teeth and is a U-shaped and becomes two teeth, also can be welded into a tooth 7,11 is the stay hook on the fixed teeth 7, it makes fixed teeth 7 better at the tension fixed effect of notch, only drawing among Fig. 6 has stay hook 11 on the tooth, the hook 11 that can fix on each fixed teeth that yes can not done yet.The 14th, solder joint.Method two: (Fig. 7) be welded into the magnetic lasso 6,14th that (among Fig. 4) is with fixed teeth 7 with many segment ferromagnetic sheets 13 according to the iron core teeth distance, solder joint, each ferromagnetic sheet 13 are reserved a joint 7 as fixed teeth.The manufacture method of the fixed teeth 7 of magnetic lasso 6 can be any welding method, and electric resistance welding is both economical.Can certainly be with other forming method.Fixed teeth not necessarily each notch is all wanted.Smooth magnetic sleeve among Fig. 1 also can directly be welded on the iron core, makes iron core notch closure.

4, electric machine with magnetic cover on slot structure according to claim 1, the notch magnetic layer ferromagnetic sheet that its further feature is a thin magnetic wedge has adopted left and right sides disjunction structure, promptly (referring to Fig. 5, from the direction of Fig. 5, the ferromagnetic sheet disjunction of slot wedge F is left and right sides two parts or many parts in the circumferencial direction disjunction.The enlarged drawing of slot wedge F is exactly Fig. 8, and left and right sides disjunction is exactly the direction disjunction at width T), adopt insulation splicing be combined into then, hereinafter to be referred as left and right sides disjunction formula.Adopt left and right sides disjunction formula ferromagnetic sheet can not cause the iron core teeth short circuit of the right and left to guarantee thin magnetic wedge.Fig. 8 is the self-contained figure of left and right sides disjunction formula thin magnetic wedge, and slot wedge is by left and right sides two parts be combined into, and thick black line is the cross section of ferromagnetic sheet in institute's drawings attached, and the ferromagnetic sheet bottom of left half is 17, and the ferromagnetic sheet bottom of right half is 18.The ferromagnetic sheet gross thickness of notch magnetic layer root 28 (Fig. 8, Figure 19) equals d.Left and right sides two parts ferromagnetic sheet adopts the insulation splicing, its joint portion be Ay (the faying face Ay among Fig. 8 broadly represented subsequent figures various about the faying face A1-A16 of insulation splicing type), Ay takes insulation measures in the joint portion, make left and right sides ferromagnetic sheet insulation, even thin magnetic wedge ferromagnetic sheet side 16 and (Fig. 5) between the iron core teeth 5 insulation unreliable, also the insulation owing to faying face Ay has guaranteed to avoid adjacent two teeth owing to using thin magnetic wedge to produce short circuit, to prevent to produce maelstrom.Two ferromagnetic sheets can be to be close to formula mutually at joint portion Ay, also can be the clearance-types that leaves some distances mutually, are separated to reduce leakage field by resin bed between face that interosculates and face.15 is stay hook, and 30 are resin extender (resin extender 30 all should be arranged in the thin magnetic wedge, but all resin extender 30 is not drawn in the thin magnetic wedge accompanying drawing afterwards).

5, according to claim 1,4 described electric machine with magnetic cover on slot structures, to be the notch magnetic layer be superimposed with additional ferromagnetic sheet by individual layer ferromagnetic sheet or individual layer ferromagnetic sheet to its further feature constitutes, its bottom ferromagnetic sheet 17 and 18 the bottom surface one side of air gap (promptly by) are parallel to the air gap face of cylinder, form left and right sides disjunction formula structure thin magnetic wedge.The ferromagnetic sheet of disjunction adopts the structure and the method for insulation splicing (i.e. splicing mutually under the insulation prerequisite).Under the insulation prerequisite, the measure of employing increase thin magnetic wedge intensity is combined into the integral body that sufficient mechanical strength is arranged with the ferromagnetic sheet of disjunction.

The thin magnetic wedge of Fig. 8 has been represented the general assembly drawing of the left and right sides disjunction class thin magnetic wedge of Fig. 9 to Figure 19, and the ferromagnetic sheet 17 on its left side and ferromagnetic sheet 18 members on the right are adopted the insulation splicing, and filling resin extender 30, becomes a thin magnetic wedge integral body.This class thin magnetic wedge can be the notch magnetic layer that the individual layer ferromagnetic sheet constitutes, it also can be shape of a saddle notch magnetic layer, shape of a saddle notch magnetic layer has two kinds of structures (Figure 19): 1. be superimposed with several layers of additional ferromagnetic sheet 29 by bedding iron magnetic sheet 17 and 18, additional ferromagnetic sheet is close to root, following additional ferromagnetic sheet is wide, narrow more above past more, form root thick and toward the middle part shape of a saddle notch magnetic layer of attenuation gradually.2. can also be that ferromagnetic sheet is made the thick past middle part of the root horse-saddle of attenuation gradually.The notch magnetic layer of Fig. 9 to Figure 18 has only been drawn the individual layer ferromagnetic sheet, can be shape of a saddle notch magnetic layer in fact.No matter be which kind of notch magnetic layer, the ferromagnetic sheet gross thickness of its root 28 equals d, ferromagnetic sheet 17 and 18 both in joint portion Ay place's combination, joint portion 16 is the side of thin magnetic wedge ferromagnetic sheet, 15 is fixed teeth (in order to strengthen the bond strength of ferromagnetic sheet and resin matrix), this class thin magnetic wedge all has a joint portion Ay, for guaranteeing splicing and bonding reliability, not only to carry out insulation processing and bonding to joint portion Ay, and should adopt the provision to strengthen splicing with adhesive effect to joint portion Ay, its measure is too numerous to enumerate, as: roughened, snap fastener (Figure 16), perforation button (Figure 12), staggered interlock (Figure 13, Figure 10), overlap joint (Figure 11), nested (Figure 17-Figure 20), some measures among fixed teeth (Figure 19) and Fig. 9, as: windowing, make and connect tooth, adopt intercommunicating pore, (these measures will describe in detail) cooperates the bonding reliable splicing that just can realize joint portion Ay and bonding with above measure.More than the characteristics of splicing measure are exactly to guarantee two insulation between the splice, thus below be referred to as insulation splicing, method is too numerous to enumerate, only lifts several.

The left and right sides ferromagnetic sheet of Fig. 9 takes the shape of the letter U, and joint portion A1 is by bonding the forming of vertical faying face A1 of two ferromagnetic sheets.In order to guarantee the adhesive strength of joint portion, adopt following measure to be used: open to connect window 19 and make at two bonding planes and is connected tooth 20,21,22,23,24,25, the connection tooth is inserted in the other side's the window with the reinforcement bonding strength.The position and the shape that connect tooth can be any, can be burrs 20,21, and burr 20 is nested in 21, also can be the window lobate 22 and 24 that is parallel to the base, the window lobate 23 that is perpendicular to the base with 25 and other angle and shape be connected tooth.Certainly, window can develop into and be out some corresponding holes 19 purely, and resin connects left and right sides ferromagnetic sheet, can strengthen bond strength; The 15th, faying face A go up and the side 16 of thin magnetic wedge ferromagnetic sheet on stay hook, only drawn one side, both sides can be done.

Figure 11 is the thin magnetic wedge of alternating expression fixed teeth.Ferromagnetic sheet 17 and 18 has many fixed teeth 27 at joint portion A3 place, reaches the other side's ferromagnetic sheet top mutually, forms the situation of staggered fixed teeth, has strengthened intensity and ferromagnetic sheet and the resin material high base strength of joint portion A3.

Tooth engaged 34 among Figure 13 is toward upwarping an angle, leave pressed 17 on tooth engaged, same, tooth engaged 35 is toward upwarping an angle, leave pressed 18 on tooth engaged, just left a bit of distance between the ferromagnetic sheet base 17 and 18, become gapped joint portion.

The left and right sides ferromagnetic sheet of Figure 19 has a bit of gap to form big magnetic resistance at joint portion A10 place, reduces the between cog leakage field.Its shape of a saddle notch magnetic layer has two kinds of structures: 1. be superimposed with several layers of additional ferromagnetic sheet 29 by bedding iron magnetic sheet 17 and 18, additional ferromagnetic sheet is close to root, additional ferromagnetic sheet width W 2＜W1＜T/2, length=L, promptly Xia Mian additional ferromagnetic sheet is wide, narrow more above past more, form root thick and toward the middle part shape of a saddle notch magnetic layer of attenuation gradually.2. can also be that ferromagnetic sheet is made root is thick and toward the middle part horse-saddle of attenuation gradually.The ferromagnetic sheet gross thickness of its root 28 equals d.Additional ferromagnetic sheet can be a multilayer.At notch magnetic layer middle part, ferromagnetic sheet 17 and 18 is done some fixed teeth 15.

6, electric machine with magnetic cover on slot structure according to claim 1, its further feature are structure and the methods that thin magnetic wedge splices to the insulation of multilayer ferromagnetic sheet structure and the differentiation of compound ferromagnetic sheet from individual layer ferromagnetic sheet class, and method is too numerous to enumerate, only lifts several.

When each element of the nested combined type notch magnetic layer of Figure 23 saves tongue and groove, become the ferromagnet sheet 44 bonding combined type notch magnetic layers that form of a picture group 25 structures, thickness still is d.In order to improve the reliability that combines of ferromagnetic sheet 44 and resin matrix, more prefabricated fixed teeth 45 and 46 on (among Figure 26) ferromagnetic sheet 44,45 and 46 are produced on the diverse location on 44, and the stain 45 and 46 among Figure 25 has been represented fixed teeth in different positions, and A15 is a faying face.The combined type notch magnetic layer of Figure 25 develops into the compound notch magnetic layer that the lamination of the high ferromagnetic sheet 48 of Figure 27 and short ferromagnetic sheet 47 alternating expressions is formed, and faying face is d for A16 thickness.

7, electric machine with magnetic cover on slot structure according to claim 1, its further feature is that thin magnetic wedge is in direction disjunction formula (ferromagnetic sheet that is about to thin magnetic wedge is divided into several sections in the length L direction) insulation system and method along rotating shaft, avoid forming big loop, to prevent to produce maelstrom.

8, electric machine with magnetic cover on slot structure according to claim 1, packaging type insulation system and method that its further feature is a thin magnetic wedge are to prevent to produce maelstrom.

Thin magnetic wedge can also be made by a ferromagnetic sheet member, is the simplest thin magnetic wedge structure that is processed into silicon steel sheet as Figure 30, the adding resin extender.17 is the notch magnetic layer, and 16 is two trapezoidal sides of slot wedge, though this structure is simple, but shortcoming clearly, that is exactly as long as side 16 and iron core teeth short circuit then can produce the eddy current in big loop, so will pay special attention to the insulating barrier reliability of side 16 and iron core.The thin magnetic wedge ferromagnetic sheet side 16 of Figure 30 is inwardly shunk, skin is wrapped up by resin material 53, the structure notch magnetic layer that forms Figure 31 of insulating barrier and core insulation also can superpose some additional ferromagnetic sheets to form the shape of a saddle, can also its ferromagnetic sheet upward some teeth of punching press strengthen the reliability that combines of ferromagnetic sheet and resin matrix as fixed teeth 15.

9, electric machine with magnetic cover on slot structure according to claim 1, its further feature is owing to can produce favourable influence to the electromagnetic property of motor after adding magnetic cover on slot, so can be optimized design again to the structure of motor, motor performance be produced the influence of having a mind to.

In the design of electrical motor, the purpose that the design of design of employing skewed slot and rotor slot-number ratio and more groove number design is to suppress slot ripples, because magnetic cover on slot has suppressed slot ripples, so the design of design of the skewed slot of motor and rotor slot-number ratio and more groove number design just can be rethought, as long as suppressed slot ripples fully, just can reduce angle of bevel or cancellation skewed slot; The rotor slot-number ratio is approached or equal 1; Suitably reduce air gap; Thereby reduce loss, improve the efficient and the capacity of generator and motor.Can correspondingly reduce the groove number and simplify technology;

10, electric machine with magnetic cover on slot structure according to claim 1, its further feature is owing to can produce favourable influence to the electromagnetic property of motor after adding magnetic cover on slot, so can be optimized design again to the structure of motor, electric machine structure and technology are produced wholesome effect.

For the motor of semi-enclosed slot and semi-open slot, can all change and be designed to open slot, help rule, improve copper factor and rule quality.

In the design of electrical motor, increasing the groove number is one of measure that suppresses slot ripples, and magnetic cover on slot has suppressed slot ripples, then can correspondingly reduce the groove number and simplify technology the many motors of groove number.