CN1841892A - Motor, stator for motor, and motor shell manufacturing method - Google Patents
Motor, stator for motor, and motor shell manufacturing method Download PDFInfo
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- CN1841892A CN1841892A CN 200610074108 CN200610074108A CN1841892A CN 1841892 A CN1841892 A CN 1841892A CN 200610074108 CN200610074108 CN 200610074108 CN 200610074108 A CN200610074108 A CN 200610074108A CN 1841892 A CN1841892 A CN 1841892A
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Abstract
This invention provides a motor capable of attaining size reduction without causing insulation failure of an air-cored coil winding. This stepping motor 1 includes an annular first stator core 31 in which a plurality of pole teeth stand at an inner-periphery edge and an air-cored coil 33 around which the pole teeth are fitted, and an insulation film 50 is formed at a surface of the air-cored coil 33. Because the air-cored coil 33 is roughly annular and simple in its shape, it is possible to uniformly form the insulation film 50 on its surface. Therefore, the insulation film 50 can be formed on the whole surface of the air-cored coil 33 with the prescribed film thickness to reduce cutting or insulation failure.
Description
(1) technical field
The present invention relates to the manufacture method of a kind of motor, motor stator and motor field frame.
(2) background technology
Usually, motor for example stepping motor comprise substantially: have the rotor portions that is fixed on the magnet on the rotating shaft; The stator department relative with this rotor portions; Circular coil-winding tube; Be wound on the coil windings on the barrel of coil-winding tube.
In this stepping motor,,, then constituting on the inside stator iron core of stator department by inlaying the integrally formed coil-winding tube that is shaped, to reduce the reel size for example if motor size is about 10mm at diameter in order to realize its miniaturization.
In addition, when the diameter of motor size is reduced to the 5mm left and right sides, if the words of integrally formed coil-winding tube then can cause coil-winding tube proportion to become big on stator core.Therefore, can not guarantee desired spiral space, existence can not obtain the problem of necessary motor torque.
Therefore, develop a kind of stepping motor, on the stator core surface, form dielectric film, direct coiling coil windings on this surface, omit the coil-winding tube and make coil-winding tube proportion disappear, increase the spiral space (for example, with reference to patent documentation 1) of coil.
In addition, the stator of stepping motor is provided with utmost point tooth.This stator is for example made by a series of pressure processing.The edge part of utmost point tooth of the prior art remains that by pressure processing punching press forms.
Patent documentation 1: the Japan Patent spy opens the 2004-112985 communique
In above-mentioned stepping motor, in order to obtain good motor characteristic, and need to form the little magnetic coupling of magnetic resistance of stator core and stator core.Therefore, in the stepping motor shown in the patent documentation 1, when on stator core, forming dielectric film,, need on the coupling part of stator core, not form dielectric film and shelter processing, cause operation to become complicated in order to ensure good magnetic coupling.In addition, depart from and on coupling part, form dielectric film, then might produce because of magnetic resistance increases that the motor characteristic that causes worsens, characteristic between motor is unbalanced if shelter.
And the shape of stator core is circular such complicated shape that a plurality of utmost point teeth are holded up at inner peripheral, so the problem that exists dielectric film to be difficult to be formed uniformly.When dielectric film was thin, the defective insulation, the hollow coil spiral that exist burr to cause cut off such problem, add thick insulating film and then have the problem that hinders miniaturization.
In addition, the coil of the band reel of relative volume on the reel, hollow coil has only the dielectric film of winding, so in motor assembling operation, might contact with other metal partss or assembling tool and cause dielectric film destruction.Therefore, when assembling is wound with the stator core of coil windings, does not produce broken string and must cautiously carry out operation, have the problem that the processing time prolongs yet in order not collide with other members.
By making stator core insulation, thereby can form portion of terminal with stator core, but the face with the flange part that forms terminal supportor of 2 inside stator yokes is closely fixing, so the configuration of terminal supportor on the rotor rotating shaft has only the degree of freedom of the direction vertical with axis direction.When electromotor diameter reduces along with miniaturization, the terminal supportor that is configured on the direction vertical with the axis direction of rotor rotating shaft narrows down at interval, coil draw with the welding of terminal line and terminal supportor the time the operation reduction, and when a plurality of terminal supportor of welding, the heat of welding can make the solder fusing of other terminal supportors that welded, and might cause the short circuit and the broken string of described terminal line.
On the other hand, above-mentioned utmost point tooth utilizes pressure processing and punching press formation, highly is the burr about 0.05mm so edge part can form.Therefore, burr can lift the spiral coil from utmost point tooth, might cause the assembly failure of spiral coil.In addition, when being wound on the spiral coil on the reel, burr can make reel heave, and makes the spiral space narrow down.In addition, require and during the spiral coil of the nothing coiling cartridge type developed adopting according in recent years motor miniaturization, when the spiral coil is installed on stator etc., burr can directly touch with the spiral coil, so the insulating coating of spiral coil and surface film are destroyed, cause defective insulation.
At this, carry out the rotating cylinder flash removed for deburring sometimes and handle.But, remove the pressure processing of making stator, also must append the rotating cylinder flash removed in addition and handle, slave unit and cost aspect are not good.And, in the rotating cylinder flash removed is handled, might concerning motor characteristic, can produce bending and damage etc. by very important utmost point tooth.In addition, in the rotating cylinder flash removed is handled, the part beyond the depolarization tooth, for example the edge part of the peristome end face of motor field frame etc. also can be cut, thus the deterioration of the assembly precision of motor field frame, and magnetic circuit narrows down.
The problems referred to above are not limited in the stepping motor and can exist, and have ubiquity in whole motor of iron core of utmost point tooth in employing.
(3) summary of the invention
Therefore, the object of the present invention is to provide and a kind ofly can not cause the defective insulation of coil windings and can realize the motor of miniaturization and can reduce the motor stator of burr of utmost point tooth and the manufacture method of motor field frame.
To achieve these goals, motor of the present invention is characterized in that, comprising: the circular iron core that a plurality of utmost point teeth are holded up at inner peripheral and be entrenched in the hollow coil that described utmost point tooth rim encloses is formed with dielectric film on the surface of described hollow coil.
According to the present invention, be entrenched in the hollow coil that the utmost point tooth rim of iron core encloses and be formed with dielectric film in its surface, roughly circular and fairly simple owing to being shaped as, so can on the whole surface of hollow coil, form dielectric film by the thickness with regulation, reduce the generation of cut-out and defective insulation etc.Because on iron core, there is not coating coating insulating film, so iron core can constitute good magnetic coupling.
In addition, in the present invention, preferably have the portion of terminal that is arranged with described iron core branch, the terminal supportor of described portion of terminal is configured on the axis direction of rotor rotating shaft.
In the present invention, described portion of terminal and described iron core branch are arranged, and are formed with insulator between terminal supportor, so can guarantee the insulating properties between terminal supportor well.In addition, because terminal supportor is arranged on the axis direction of rotor rotating shaft, so even motor miniaturization also can enlarge the liftoff arrangement terminal supportor of terminal supportor spacing.
Moreover, in the present invention, preferably described iron core is carried out deburring processing.By described iron core being carried out deburring processing, thereby because burr, shrinkage cavity can be removed or reduce to the processing of described iron core, so even attenuate is formed on described dielectric film on the described hollow coil, also can prevent the defective insulation of the described hollow coil that causes because of the burr that produces described iron core and shrinkage cavity and the cut-out of spiral.In addition, but because the described dielectric film on the described hollow coil of attenuate so can realize the miniaturization of motor along with the miniaturization of hollow coil, increases the winding coiling number of turns of described hollow coil, the raising motor characteristic.
In addition, in the present invention, preferably described relatively iron core, another circular iron core that a plurality of utmost point teeth are holded up at inner peripheral is overlapping on axis direction, and the end face of described another iron core and the described hollow coil relative with the end face of the axis direction of this another iron core is a contactless state.
According to the present invention,,, can keep insulating properties at an easy rate so folder is not established insulating component because the end face of described another iron core and the described hollow coil relative with the end face of the axis direction of this another iron core is a contactless state.
Moreover, in another the present invention, in the motor stator that comprises iron core, the peripheral part of utmost point tooth and the toothholder of utmost point between cog are carried out chamfer machining with utmost point tooth.Therefore, by chamfer machining, can reduce to be formed on the burr on the toothholder of the peripheral part of utmost point tooth and utmost point between cog.
In foregoing invention, with respect to the bottom center of the motor field frame on the direction vertical and the length of utmost point tooth with described motor rotation axis, can make utmost point tooth rotating shaft axially on length long.Like this, can not strengthen the diameter of motor, can prolong the magnetic circuit with rotor, so can realize the miniaturization of motor.
In addition, in foregoing invention,, be formed on burr size on the toothholder of the peripheral part of utmost point tooth and utmost point between cog below 0.03mm preferably by chamfer machining.At this moment, the burr size is compared significantly with 0.05mm of the prior art and is reduced, so can suppress the insulating coating of burr infringement spiral coil.
On the other hand, in the present invention again, in the manufacture method of the motor field frame of the motor that comprises iron core, in a series of pressure processing of making motor field frame, has the chamfering process that the toothholder of the peripheral part of utmost point tooth and utmost point between cog is carried out chamfer machining with utmost point tooth.Therefore, because the peripheral part of utmost point tooth and the toothholder of utmost point between cog are carried out chamfer machining, can as handling, not cut rotating cylinder flash removed of the prior art the edge part of the peristome end face of motor field frame.In addition,,, compare, can significantly reduce cost with the situation of carrying out the processing of rotating cylinder flash removed so can suppress the increase of manufacturing procedure because in a series of pressure processing of making motor field frame, carry out chamfer machining.
In foregoing invention, preferably the peripheral part of utmost point tooth and the toothholder of utmost point between cog are carried out chamfer machining simultaneously.At this moment, also can carry out good chamfer machining to the seam portion of utmost point tooth and toothholder.That is, the chamfer machining as if carry out utmost point tooth and toothholder with different operations then can stay burr in seam portion, but the present invention can prevent this from occurring.
The invention effect:
Motor of the present invention is characterized in that, comprising: the circular iron core that a plurality of utmost point teeth are holded up at inner peripheral and be entrenched in the hollow coil that described utmost point tooth rim encloses is formed with dielectric film on the surface of described hollow coil.
According to the present invention, be entrenched in the hollow coil that the utmost point tooth rim of iron core encloses and be formed with dielectric film in its surface, so can on the whole surface of hollow coil, form dielectric film by the thickness with regulation, reduce and cut off and the generation of defective insulation etc.In addition, because on iron core, there is not coating coating insulating film, so iron core can constitute good magnetic coupling.
In addition, according to motor stator of the present invention,, can reduce to be formed on the burr on the toothholder of the peripheral part of utmost point tooth and utmost point between cog by chamfer machining.Thus, when adopt not having the motor of coiling cartridge type, can suppress the insulating coating Yin Maoci of spiral coil and damage, can significantly reduce the generation of defective insulation.In addition, when adopting the motor of band reel, can suppress Yin Maoci and reel is heaved, can guarantee enough spiral spaces.Moreover, no matter having or not reel, all can easily spiral coil or reel be installed on the stator.
In addition, in above-mentioned motor stator, the size of burr significantly is reduced to below the 0.03mm from 0.05mm of the prior art, so can suppress the insulating coating of burr infringement spiral coil.
Moreover, manufacture method according to the motor field frame of motor of the present invention, because the peripheral part of utmost point tooth and the toothholder of utmost point between cog are carried out chamfer machining, can as handling, not cut rotating cylinder flash removed of the prior art the edge part of the peristome end face of motor field frame.Therefore, the assembly precision of motor field frame can be improved, and the formation of magnetic circuit can be guaranteed.In addition,,, compare, can improve the machining accuracy that burr is removed, can significantly reduce cost with the situation of carrying out the processing of rotating cylinder flash removed so can suppress the increase of manufacturing procedure because in a series of pressure processing of making motor field frame, carry out chamfer machining.
In the manufacture method of the motor field frame of above-mentioned motor, also can carry out good chamfer machining to the seam portion of utmost point tooth and toothholder.That is,, then can stay burr, but the present invention can prevent this from occurring, realize uniform chamfering in seam portion if carry out the chamfer machining of utmost point tooth and toothholder with different operations.
(4) description of drawings
Fig. 1 is the side sectional view of the basic structure of expression stepping motor.
Fig. 2 is the decomposition assembling figure of expression hollow coil, insulating properties thin plate and stator core.
Fig. 3 is the front view of the relation of expression terminal board and stator.
Fig. 4 is the vertical view of the relation of expression terminal board and stator.
Fig. 5 is the figure of expression terminal board, (a) is the I-I line cutaway view in (b), (b) is vertical view, (c) is the II-II line cutaway view in (b), (d) is upward view.
Fig. 6 is the end view of the detailed structure of expression stage portion.
Fig. 7 is the figure of expression motor, (a) is end view, (b) is upward view.
Fig. 8 is the expression motor field frame and the upward view of the welding of using plate is installed.
Fig. 9 is the figure of expression motor field frame, (a) is vertical view, (b) is end view.
Figure 10 is the figure of the opening operation of expression motor field frame, (a) is end view, (b) is front view.
Figure 11 is the utmost point tooth of expression motor field frame and the figure of toothholder, (a) is vertical view, (b) is end view.
Figure 12 is the figure of the manufacturing process of expression motor field frame.
Figure 13 is the figure at the position that employed mould pressurizes to utmost point tooth in the expression chamfering process, (a) is the longitudinal section end view, (b) is cross-sectional plan view.
(symbol description)
1 stepping motor, 3 stator departments
31, the fitting portion of 32 stator core 31b, 32b stator core
33,34 drive coil 33a, 34a spiral end
The fitting portion of 35 terminal board 35a terminal boards
36 terminal supportors, 41 gaps
42 projections, 43 stage portion
55 chamfering process, 60 utmost point teeth
(5) embodiment
(structure of motor)
Fig. 1 is the cutaway view of the major part of PM (permanent magnet) the type stepping motor of suitable the present invention's one example.
Fig. 2 is the key diagram of the structure of the stator department 3 of expression stepping motor 1 shown in Figure 1.
(formation of motor)
The stepping motor 1 of this example shown in Figure 1 comprises: have the rotor portions 2 of rotating shaft 21 and rotor magnet (permanent magnet) 22 and leave the stator department 3 of relative with gap configuration with this rotor magnet 22, rotating shaft 21 is supported freely by bearing 4 rotations.Another bearing (not shown) for example is arranged on the port of export opening of first stator core 31 or installs near the opening of using the plate inboard, perhaps is arranged on the fore-end of rotating shaft 21 by not shown shell.
Constituting on the rotating shaft 21 of rotor portions 2, rotor magnet 22 is by being adhesively fixed on the rotating shaft 21, and rotor magnet 22 is made of permanent magnet cylindraceous roughly.
On the axial both ends of the surface of rotor magnet 22, be formed with circular recess,, make rotor magnet 22 weight own lighter by forming these recesses.Like this, owing to the moment of inertia of rotor magnet 22 that makes in light weight reduces.
The other end of rotating shaft 21 becomes the output shaft that prolongs for the rotation of exporting stepping motor 1.
In first and second stator cores 31,32, respectively the peripheral part of utmost point tooth and the toothholder of utmost point between cog (base section of utmost point tooth and utmost point between cog) are carried out chamfer machining.Therefore, can reduce the defective insulation of the hollow coil 33,34 that the burr because of utmost point tooth causes.At this, be preferably below the 0.03mm through the size of the burr after the chamfer machining.
Periphery at each utmost point tooth of first stator core 31 disposes circular hollow coil 33, and is same, disposes circular hollow coil 34 in the periphery of each utmost point tooth of second stator core 32.
The all surfaces of this circular hollow coil 33,34 all is formed with and improves the dielectric film 50 that insulating properties is used.First stator core 31 and hollow coil 33 are undertaken affixed by bonding agent.Equally, second stator core 32 and hollow coil 34 are undertaken affixed by bonding agent.
This stepping motor 1 comprises: stator core 31,32,37,38; Be assembled in the hollow coil (drive coil) 33,34 in this stator core 31,32,37,38; And terminal board 35, this terminal board 35 is provided with a plurality of terminal supportors 36, the spiral of this hollow coil (drive coil) 33,34 of reeling on this terminal supportor 36 terminal 33a, 34a.As shown in Figure 3 and Figure 4, fitting portion 31b, the 32b tabling of the fitting portion 35a of terminal board 35 and stator core 31,32, and between terminal board 35 and hollow coil 33,34, be provided with gap 41.
The fitting portion 35a of terminal board 35 is a through hole.Fitting portion 31b, the 32b of stator core 31,32 are made of the projection that is pressed among the fitting portion 35a.Thus, make assembling simple, and can prevent that terminal board 35 from falling down.As shown in Figure 5, terminal supportor 36 is made of the pin of metal L font.And terminal supportor 36 is inlayed shaping and is formed terminal board 35 with the insulating material that is made of liquid crystal polymer.Thereby utilize liquid crystal polymer can obtain high-fire resistance.
Each terminal supportor 36 towards the direction that radially parallels that is configured to stepping motor 1.The base portion 36a of each terminal supportor 36 is towards the axially setting of stepping motor 1, and outstanding a little from terminal board 35.Like this, on base portion 36a, also can carry out distribution, therefore, for example since be provided with the space relation and can not be on terminal supportor 36 during distribution, also can on base portion 36a, carry out distribution.In addition, even if after being arranged on stepping motor 1 on the device, also can utilize base portion 36a to confirm the electrical characteristic of stepping motor 1.Moreover terminal supportor 36 is L fonts, so its anti-intensity that comes off is extremely strong.
In addition, on the periphery of the fitting portion 35a of the terminal board 35 of the side on the fitting portion 31b, the 32b that are entrenched in stator core 31,32, be formed with a plurality of projections 42.Like this, shown in Fig. 5 (a), prevent spiral terminal 33a, 34a and be used for drawing the edge butt of the through hole of spiral, thereby can prevent the broken string that the edge causes from motor field frame 37.And projection 42 is stuck on the edge of motor field frame 37, can prevent that terminal board 35 from falling down.
In addition, be formed with stage portion 43 at the periphery of the terminal supportor 36 of terminal board 35, spiral terminal 33a, 34a are being wound on the terminal supportor 36 to climbing on the stage portion 43.Thus, as Fig. 6 and shown in Figure 4, the terminal 33a of spiral arrives terminal supportor 36 in stage portion 43, so also can the arrival terminal supportor 36 part 33b before of spiral not interfered even FPC44 etc. is installed later on.Therefore, this part 33b can not improve the product percent of pass when stepping motor 1 is installed because of FPC44 is cut off.
And in this example, another first stator core 37 also plays a role as motor field frame, so in the following description, is conceived to the feature as housing, and first stator core 37 is described as first motor field frame 37.Equally, another second stator core 38 describes as second motor field frame 38.
As shown in Figure 1, first and second stator cores 31,32 and first motor field frame 37, second motor field frame 38 are provided with one heart by the axis with rotating shaft 21, and by deposited in addition affixed.
At this, as shown in Figure 7, this stepping motor 1 has: the installation plate 45 that the side is provided with the motor field frame 37 of peristome 46 and this motor field frame 37 is installed.Motor field frame 37 is fixed by modes such as spot welding with installing with plate 45.
As shown in Figure 8, first motor field frame 37 comprises: the bottom surface sections 37a that has the line part at a position at least; Have with this line part is the side surface part 37c of the planar portions 37d on limit; Be formed on the peristome 46 on the planar portions 37d.And, on the limit relative, have rib 37b with the bottom surface sections 37a of peristome 46.
(manufacturing process of motor field frame)
The manufacturing process of this motor field frame 37,38 is as described below.
The manufacturing of motor field frame 37,38 is carried out in a progressive die.As shown in figure 12, in this progressive die, carry out following formation operation: cut off with the blank of 62 redundance and remove operation; Be formed for forming the stretching process 51 of the conus portion of utmost point tooth 60; The deep-draw operation 52 of carrying out deep-draw in order to form the housing shape; Form terminal board 35 and be used to locate iron core the cross-drilled hole stamping procedure 53 of cross-drilled hole; Form the tooth stamping procedure 54 of utmost point tooth 60; Simultaneously utmost point tooth 60 and toothholder 61 are carried out the chamfering process 55 of C chamfering; Vertically hold up the tooth bending operation 56 of utmost point tooth 60; With motor field frame 37 from the 62 cutting-out operations 57 of downcutting.
In addition, among Figure 12 motor field frame 37 is illustrated for circular situation, but be oval-shaped situation, the operation of the oval-shaped deep-draw shape of formation is joined in the series of processes at motor field frame 37.Moreover, join in the series of processes by the operation that will form peristome 46, can carry out chamfering to a series of pressurization operations of utmost point tooth 60 usefulness of oval-shaped motor field frame 37 with peristome 46.
As shown in figure 13, in chamfering process 55, use simultaneously patrix 63 and the counterdie 64 that utmost point tooth 60 and toothholder 61 is carried out chamfering for the utmost point tooth 60 of the inclination that in tooth stamping procedure 54, forms.Counterdie 64 is provided with the recess 64a of the edge 60a that presses blunt utmost point tooth 60 peripheral parts.In this example, the edge of recess 64a forms the plane 64b that gradient is 45 degree.And, between patrix 63 and counterdie 64, clip utmost point tooth 60 and toothholder 61 ground pressurize, blunt thereby burr is pressed by plane 64b, can carry out the C chamfering.At this, the utmost point tooth 60 of formed inclination in tooth stamping procedure 54 is carried out chamfer machining, so be difficult to the chamfering of utilizing pressure processing to carry out can realize in the prior art that the utmost point tooth after the vertical shaping 60 carried out chamfering the time.Therefore, prevent to produce smear metal, can keep the machining accuracy of higher utmost point tooth 60.
In addition, because be formed for forming the stretching process 51 of the conus portion of utmost point tooth 60, so with respect to the bottom center 65 of the motor field frame 37,38 on the direction vertical with the rotating shaft 21 of motor 1 and the length of utmost point tooth 60, the utmost point tooth 60 that can extend is in the length of rotating shaft 21 on axially.
On the other hand, in the operation of cross-drilled hole stamping procedure 53 and formation peristome 46, as shown in figure 10, one side use has the mould 48 of the three limits pairing コ word shape cutting except that the limit relative with bottom surface sections 37a and bottom surface sections 37a is carried out punching press as being used of mould 48 from side direction drift 49.Relative mould 48 of the shape of drift 49 and bottom surface sections 37a have the gap.
And, mould 48 is inserted in the housing 37, unilaterally planar portions 37d is carried out punching press from side direction one by one with drift 49.At this moment, housing 37 utilizes spring etc. to be pressed in advance on the mould 48.Like this, because bottom surface sections 37a is used as one side of mould, so can on one side relative of peristome 46, carry out punching press in ground by residual rib 37b with bottom surface sections 37a.
In the form of this enforcement, as depicted in figs. 1 and 2, the relation between the thickness Z of the length Y of the axis direction of the length X of the axis direction that is formed by first stator core 31 and first motor field frame 37, hollow coil 33 and insulating properties thin plate 40 satisfies: X＞Y+Z.
Between the end face of the end face of the axis direction of first motor field frame 37 and the hollow coil 33 relative with this end face for guaranteeing that insulating properties is formed with gap S.On the axis direction of second motor field frame 38 and hollow coil 34, be formed with gap S equally.
Bearing 4 is formed by the resin with lubrification, and radially rotates an end of supporting rotating shaft 21 freely.On the bearing 4 of radial support, be formed with: the bearing portion that the rotating shaft 21 that inserts is supported, be pressed into the portion that is pressed in the internal diameter that is fixed in second motor field frame 38, the outstanding diametrically flange part of a part of peripheral part.
The above-mentioned bearing portion of bearing 4 embeds and is configured in the recess that forms on the rotor magnet 22, thereby suppresses the axial dimension of stepping motor 1 integral body.The internal diameter of above-mentioned bearing portion is compared with the external diameter of rotating shaft 21, and size is for forming the degree in gap.In addition, the above-mentioned flange part of bearing 4 is positioned on second motor field frame 38, carries out the location of axis direction.
Below, with reference to Fig. 2 hollow coil and the insulating properties thin plate that constitutes stator department 3 is illustrated.In this example, stator department 3 constitutes by 2 groups, owing to be identical structure, only first stator core 31 is illustrated at this, and the explanation of second stator core 32 is omitted.
Be embedded in the hollow coil 33 of first stator core 31, coating coating insulating film 50 on all surfaces of the coil windings of coiling multiturn.Be formed with on the surface of above-mentioned coil windings thin from crucible zone, when heating from crucible zone fusing and affixed each other with adjacent coil windings.In addition, formed dielectric film 50 on all surfaces of the coil windings of coiling multiturn is the coating based on polyamide-imide resin in this example.
The manufacturing process of this hollow coil 33 is as described below.
At first, above-mentioned coil windings is reeled with the number of turns of the motor torque that can obtain stipulating on as the bar of volume core, and make coiling starting end 33a and reel and finish end 33a and expose on the surface of winding layer.And, roughly the same with the periphery that constitutes by a plurality of utmost point teeth that are formed on first stator core 31 as the external diameter of the bar of rolling up core.
Winding is blown into hot blast from the outside in coiling, make self fusion when reeling, and makes the coil windings that is wound on the volume core bonding each other.After the fusion, will extract out as the bar of volume core, the coil windings of coiling forms hollow coil 33.In addition, self fusion of spiral also can be behind the coiling, at coiling starting end 33a and reel and finish to apply between the end 33a voltage of regulation, make and pass through electric current on the coil windings, after making it heating, the coil windings surface from the crucible zone melting and solidification, the coil windings that is wound on the core is bonding each other.
Next, on the surface of hollow coil 33, utilize dipping coating to form dielectric film 50.
Simple declaration, dipping coating are that hollow coil 33 is immersed in the coatings tank based on polyamide-imide resin, propose the back and with hair-dryer coating are blown away, and make its drying.Above-mentioned operation is implemented repeatedly, up to the thickness of guaranteeing to stipulate, for example be the thickness of 30 μ m degree in this example till.The thickness of dielectric film is preferably chimeric or be connected with more than the size of the burr of stator core of hollow coil and shrinkage cavity.On the other hand, if the dielectric film thickening then can cause coil to maximize, so be preferably in below the 100 μ m.
On the end face 33h of the axis direction of hollow coil 33, and the end face 31a of first stator core 31 between be folded with insulating properties thin plate 40.Insulating properties thin plate 40 is ring-types, and in this example, its material is a polyethylene terephthalate.In this example, the thickness of insulating properties thin plate 40 is 16 μ m, is that 100v can guarantee good insulation performance when above at its withstand voltage voltage.Insulating properties thin plate 40 is compared with dielectric film 50 has toughness.
In addition, in this example, the periphery of a plurality of utmost point teeth 60 of the internal diameter of insulating properties thin plate 40 and first stator core 31 is roughly the same, and its external diameter is littler than the external diameter of first stator core 31.Because littler, so when first stator core 31 and second stator core 32 being carried out can not form obstruction when deposited than the external diameter of first stator core 31.
In addition, when dipping coating, compare with the outer peripheral face 33b and the inner peripheral surface 33c of hollow coil 33, bight 33d～33g is not easy to be stained with coating, blows away easily during with hair-dryer.Therefore, these bights 33d～33g compares with outer peripheral face 33b and inner peripheral surface 33c, and thickness can attenuation sometimes.
At this moment, when chimeric empty core coil 33, might Yin Maoci or its dielectric film 50 peel off, and can make short circuit between the coil windings and first stator core 31, or the coil windings broken string.
That is, because first and second stator cores 31,32 and first and second motor field frames the 37, the 38th, form by pressure processing, so in the pressurization operation, can generation burr and shrinkage cavity on the end face 31a of first stator core 31.In addition, the cardinal extremity of a plurality of utmost point teeth 60 of first stator core 31 part forms the R shape sometimes.Like this, occasion when residual jagged and shrinkage cavity on the utmost point toothed portion of first stator core 31 and end face 31a, when chimeric empty core coil 33, owing to be pressed in these burrs and the R portion, dielectric film 50 can peel off, perhaps burr and shrinkage cavity meeting scrape on the dielectric film 50, thereby might make coil windings and 31 short circuits of first stator core, or coil windings broken string, withstand voltage bad.
On the other hand, the thickness of dielectric film 50 by thickening hollow coil 33, the broken string of the hollow coil 33 that can prevent Yin Maoci and shrinkage cavity and cause and the defective insulation of first stator core 31, but can cause hollow coil 33 to maximize, hinder the miniaturization of motor.
Therefore, if carry out the rotating cylinder flash removed processing of first stator core 31 or utilize pressurization that punch-out is carried out flash removed processing and reduce the words of burr, shrinkage cavity, then the coil windings and first stator core 31 can short circuits, and coil windings can not break, withstand voltage bad.Therefore, the utmost point toothed portion that preferably first and second stator cores 31,32 and first and second motor field frames is engaged with hollow coil 33 etc. carries out the processing of rotating cylinder flash removed or utilizes flash removedes such as the chamfering processing of pressurization.
In addition, except that the processing of above-mentioned flash removed, by being folded with insulating properties thin plate 40, because insulating properties thin plate 40 has toughness than dielectric film 50, thus can breakage even contact with the burr that forms on first stator core 31 also, and burr can be covered.Therefore, insulating properties thin plate 40 plays the effect of thickness of the dielectric film 50 of the end face 33h (comprising the bight) that replenishes hollow coil 33, thereby can guarantee the insulation with first stator core 31.
When above-mentioned stepping motor 1 was assembled, as shown in Figure 2, first stator core 31 (or second stator core 32) after unloading first motor field frame 37 (or second motor field frame 38) was gone up with the affixed insulating properties thin plate 40 of bonding agent.
After bonding, hollow coil 33 (or hollow coil 34) is entrenched in the periphery of the utmost point tooth 60 of first stator core 31 (or second stator core 32), hollow coil 33 is adhesively fixed.And, terminal board 35 is pressed into and is temporarily fixed on fitting portion 31b, the 32b of each stator core 31,32.And, terminal 33a, the 34a of each coil 33,34 is wound on the terminal supportor 36.
Then, first motor field frame 37 (or second motor field frame 38) is installed, assembling stator department 3.As shown in Figure 1, this stator department 3 leaves relative with gap configuration with rotor magnet 22 and assembles.At this, terminal board 35 finally is adhesively fixed on motor field frame 37,38.
, be omitted because identical about the installation of stepping motor 1 in this detailed description with the installation of existing well-known stepping motor etc.
(other example)
Above-mentioned form only is an example of preferable form of the present invention, and the present invention is not limited thereto, can carry out various distortion and implement under the prerequisite that does not break away from aim of the present invention.
For example, in this example, the burr of utmost point tooth 60 and toothholder 61 size is below the 0.03mm, but is not defined as this numerical value certainly.In addition, in chamfering process 55, utilize that to have gradient be that the counterdie 64 of the plane 64b of 45 degree carries out the C chamfering of utmost point tooth 60 and toothholder 61, but be not limited thereto, also can be the R chamfering.
In addition, in this example, simultaneously utmost point tooth 60 and toothholder 61 are carried out chamfering, but be not limited thereto, for example when the burr of the seam portion of utmost point tooth 60 and toothholder 61 is not serious, also can carry out chamfering respectively.
In addition, in this example, be suitable for stepping motor as motor, but be not limited thereto, the motor of other kinds with utmost point tooth 60 is also applicable.In addition, for example in this example, the bottom surface sections 37a of motor field frame 37 forms ellipse, but is not limited thereto, and also can form square or cylindrical shape.In addition, making motor field frame at 37,38 o'clock, the opening operation is also carried out in the progressive die, but is not limited thereto, and also can carry out in addition.
In addition, in this example, the base portion 36a of terminal supportor 36 be arranged on stepping motor 1 axially on, but be not limited thereto, also can be arranged on week upwards.In addition, the end of base portion 36a is outstanding from terminal board 35, but also can not give prominence to.Moreover in this example, terminal board 35 is provided with projection 42 and stage portion 43, but also these parts can be set, can suitably be provided with as required.
In this example, terminal supportor 36 is inlayed shaping with the insulating material that is made of liquid crystal polymer, but is not limited thereto, and also can utilize other material to inlay shaping.Perhaps also can be arranged on the terminal board 35 by being pressed into terminal supportor 36 grades.
Terminal supportor also can be configured to the general square shape shape, or the almost parallel quadrangle form.Preferably the terminal supportor more than at least 2 is configured on the axis direction of rotating shaft 21.Like this, by the configuration terminal supportor, thereby can not constitute portion of terminal 35 under the outstanding situation from the electromotor diameter (motor width) that diminishes because of miniaturization.In addition, because the terminal supportor more than at least 2 is configured on the axis direction of rotating shaft 21, so can widen terminal supportor at interval, thereby solder terminal pin and hollow coil draw terminal line the time, scolder overlap joint between terminal supportor and the terminal supportor that has welded can not melt because of the welding heat of other terminal supportors, can not cause bad connection.Terminal board 35 usefulness insulating resins are separated between terminal supportor and terminal supportor and stator core 31,32, so the heat of welding is difficult to conduction.Therefore, the scolder of the terminal supportor that welding is good can not melt dielectric film of hollow coil 33,34 that contacts with stator core 31,32 and can not melting from crucible zone of hollow coil winding.
Use in this example to have the stepping motor 1 of 2 stator cores 31,32, but be not limited thereto, also one of stator core.In addition, adopt and utilized the stepping motor that does not have bobbin of hollow coil, but be not limited thereto, also can adopt the stepping motor of bobbin with coiling coil as drive coil.
In this example, the material of insulating properties thin plate 40 is a polyethylene terephthalate, but is not limited thereto, and also can be polyester or polyamide-imide resin etc.In addition, when insulating properties thin plate 40 usefulness and dielectric film 50 identical polyamide-imide resins form, can constitute all very good stepping motor of insulating properties and thermal endurance.
In this example, insulating properties thin plate 40 usefulness bonding agents are fixed, but are not limited thereto, also non-sticking connecing and fixing mode such as to be pressed into.In addition, in this example, insulating properties thin plate 40 is ring-types, but is not limited thereto, and the shape that waits other also is set part.Moreover, identical or at the thickness of the size of burr and dielectric film 50 than its hour, also insulating properties thin plate 40 can be set.
(action of stepping motor)
The as above stepping motor 1 of Gou Chenging feeds predetermined electric current to the hollow coil 33,34 of stator department 3, because the magnetic field interaction between stator department 3 and the rotor magnet 22, rotor magnet is rotated by the application of force, also rotates with the rotating shaft 21 of its one.Because the action of the action of stepping motor 1 and existing known stepping motor etc. is identical, so be omitted in this detailed description.
Stepping motor 1 comprises: the first and second circular stator cores 31,32 that a plurality of utmost point teeth are holded up at inner peripheral; And be entrenched in the hollow coil 33,34 that above-mentioned utmost point tooth rim encloses, be formed with dielectric film 50 on the surface of this hollow coil 33,34.
The shape of hollow coil 33 is roughly circular, because simple shape, so can be formed uniformly dielectric film 50 in its surface.Therefore, can on the whole surface of hollow coil 33, form dielectric film 50 by the thickness with regulation, reduce the generation of cut-out and defective insulation etc.
Because on stator core, there is not coating coating insulating film, can constitute the good magnetic coupling of stator core, so the motor of motor characteristic equilibrium can be provided.
In addition, in stepping motor 1, have the portion of terminal 35 that was arranged in 31,32 minutes with stator core, the terminal supportor 36 of portion of terminal 35 is configured on the axis direction of rotating shaft 21.
Thus, portion of terminal 35 and stator core were arranged in 31,32 minutes, were formed with insulator between terminal supportor, so can guarantee the insulating properties between terminal supportor well.In addition, because terminal supportor 36 is arranged on the axis direction of rotating shaft 21, so even motor miniaturization also can enlarge the liftoff arrangement terminal supportor of terminal supportor spacing.Moreover, even in when action, also can prevent hollow coil 33 on axis direction or the footpath upwards move and contact with the member that constitutes motor, can not cause cut-out and defective insulation etc.
In addition, in stepping motor 1, stator core 31,32 and motor field frame 37,38 are carried out deburring processing.Thus, can remove or reduce burr, shrinkage cavity that the processing because of stator core 31,32 and motor field frame 37,38 produces, so the dielectric film 50 that can prevent to be formed on the hollow coil 33,34 peels off because of burr, the shrinkage cavity of stator core 31,32 and motor field frame 37,38, can prevent that burr, shrinkage cavity from entering in the dielectric film 50.Thus, can not produce the cut-out, withstand voltage bad of the defective insulation of hollow coil 33,34 and spiral.In addition, but because the dielectric film 50 of attenuate hollow coil 33,34,, increase the winding coiling number of turns of hollow coil 33,34, improve motor characteristic so can realize the miniaturization of motor along with the miniaturization of hollow coil 33,34.
In addition, in stepping motor 1, relative first stator core 31, the first circular motor field frame 37 (another first stator core) that a plurality of utmost point teeth are holded up at inner peripheral is overlapping on axis direction, the end face of first motor field frame 37 and the hollow coil 33 relative with the end face of the axis direction of this first motor field frame 37 is a contactless state, so folder is not established insulating component, can keep insulating properties at an easy rate.
Moreover, in the stator 3 of the motor 1 that comprises the iron core 31,32 that contains utmost point tooth 60, the peripheral part of utmost point tooth 60 and the toothholder 61 of utmost point between cog are carried out chamfer machining.Therefore, the burr 60a that is formed on the toothholder 61 of the peripheral part of utmost point tooth 60 and utmost point between cog reduces by chamfer machining.Thus, when adopt not having the motor 1 of coiling cartridge type, can suppress the insulating coating Yin Maoci of spiral coil 33,34 and damage, can significantly reduce the generation of defective insulation.In addition, when adopting the motor of band reel, can suppress Yin Maoci and reel is heaved, can guarantee enough spiral spaces.Moreover, no matter having or not reel, all can easily spiral coil 33,34 or reel be installed on the stator 3.
In addition, making the size of the burr 60a on the toothholder 61 of the peripheral part that is formed on utmost point tooth 60 and utmost point between cog by chamfer machining is below the 0.03mm.Therefore, the size of burr 60a is compared significantly with 0.05mm of the prior art and is reduced, so can suppress the insulating coating of burr infringement spiral coil 33,34.
On the other hand, in the manufacture method of the motor field frame 37,38 of the motor 1 that comprises the iron core 31,32 that contains utmost point tooth 60, in making a series of pressure processing 50～56 of motor field frame 37,38, has the chamfering process 55 that the toothholder 61 of the peripheral part of utmost point tooth 60 and utmost point between cog is carried out chamfer machining.Therefore, because the peripheral part of utmost point tooth 60 and the toothholder 61 of utmost point between cog are carried out chamfer machining, can as handling, not cut rotating cylinder flash removed of the prior art the edge part of the peristome end face of motor field frame.Therefore, can improve the assembly precision of motor field frame, and guarantee to form magnetic circuit.In addition, because in a series of pressure processing 50～56 of making motor field frame 37,38, carry out chamfer machining,, compare with the situation of carrying out the processing of rotating cylinder flash removed so can suppress the increase of manufacturing procedure, can improve the machining accuracy of deburring, and can significantly reduce cost.
And, the peripheral part of utmost point tooth and the toothholder of utmost point between cog are carried out chamfer machining simultaneously.Therefore, also can carry out good chamfer machining to the seam portion of utmost point tooth and toothholder.That is,, then can stay burr, but the present invention can prevent this from occurring, can carry out chamfering equably in seam portion if carry out the chamfer machining of utmost point tooth and toothholder with different operations.
Claims (9)
1, a kind of motor is characterized in that, comprising: the circular iron core that a plurality of utmost point teeth are holded up at inner peripheral and be entrenched in the hollow coil that described utmost point tooth rim encloses is formed with dielectric film on the surface of described hollow coil.
2, motor as claimed in claim 1 is characterized in that, the portion of terminal that is arranged with described iron core branch and the terminal supportor of described portion of terminal are configured on the axis direction of rotor rotating shaft.
3, motor as claimed in claim 1 is characterized in that, described iron core is carried out chamfer machining.
4, as each described motor in the claim 1 to 3, it is characterized in that, described relatively iron core, another circular iron core that a plurality of utmost point teeth are holded up at inner peripheral is overlapping on axis direction, and the end face of described another iron core and the described hollow coil relative with the end face of the axis direction of this another iron core is a contactless state.
5, a kind of motor stator comprises the iron core with utmost point tooth, it is characterized in that, the peripheral part of described utmost point tooth and the toothholder of utmost point between cog are carried out chamfer machining.
6, motor stator as claimed in claim 5 is characterized in that, with respect to the bottom center of the motor field frame on the direction vertical and the length of described utmost point tooth with described motor rotation axis, described utmost point tooth described rotating shaft axially on length long.
7, as claim 5 or 6 described motor stators, it is characterized in that,, be formed on burr size on the toothholder of the peripheral part of described utmost point tooth and utmost point between cog below 0.03mm by described chamfer machining.
8, a kind of manufacture method of motor field frame of motor, it is the manufacture method of motor field frame that comprises the motor of iron core with utmost point tooth, it is characterized in that, in making a series of pressure processing of described motor field frame, has the chamfering process that the toothholder of the peripheral part of described utmost point tooth and utmost point between cog is carried out chamfer machining.
9, the manufacture method of the motor field frame of motor as claimed in claim 8 is characterized in that, the peripheral part of described utmost point tooth and the toothholder of utmost point between cog are carried out chamfer machining simultaneously.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2005091813 | 2005-03-28 | ||
| JP2005091813A JP2006280035A (en) | 2005-03-28 | 2005-03-28 | Stepping motor |
| JP2005098352 | 2005-03-30 |
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| CN1841892A true CN1841892A (en) | 2006-10-04 |
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| CN (1) | CN1841892A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101873020B (en) * | 2009-04-27 | 2013-01-09 | 三菱电机株式会社 | Rotating motor |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US7911094B2 (en) | 2007-08-31 | 2011-03-22 | Nidec Sankyo Corporation | Stepping motor |
| JP5185590B2 (en) * | 2007-10-11 | 2013-04-17 | 日本電産サンキョー株式会社 | motor |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPS5941133A (en) * | 1982-08-30 | 1984-03-07 | Shinko Electric Co Ltd | Insulating method for coil of electromagnetic clutch brake |
| JPH01159579A (en) * | 1987-12-16 | 1989-06-22 | Hitachi Ltd | Deodorizer for refrigerator |
| JPH03150063A (en) * | 1989-10-12 | 1991-06-26 | Oki Electric Ind Co Ltd | Coil assembly for pm type pulse motor |
| JPH0442767A (en) * | 1990-06-05 | 1992-02-13 | Seiko Instr Inc | Small-sized motor |
| JPH09117123A (en) * | 1995-10-13 | 1997-05-02 | Mitsubishi Materials Corp | Stepping motor |
| JPH11285227A (en) * | 1998-03-26 | 1999-10-15 | Asmo Co Ltd | Stator core, stator, and stepping motor |
| JP2004007899A (en) * | 2002-05-31 | 2004-01-08 | Sankyo Seiki Mfg Co Ltd | Motor |
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|---|---|---|---|---|
| CN101873020B (en) * | 2009-04-27 | 2013-01-09 | 三菱电机株式会社 | Rotating motor |
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