CN105703569A - Fabrication method for amorphous alloy motor stator iron core - Google Patents
Fabrication method for amorphous alloy motor stator iron core Download PDFInfo
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- CN105703569A CN105703569A CN201610221769.5A CN201610221769A CN105703569A CN 105703569 A CN105703569 A CN 105703569A CN 201610221769 A CN201610221769 A CN 201610221769A CN 105703569 A CN105703569 A CN 105703569A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K15/00—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
- H02K15/02—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies
- H02K15/024—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies with slots
Abstract
The invention belongs to the technical field of motor fabrication, in particular relates to a fabrication method for an amorphous alloy motor stator iron core. The fabrication method comprises the following steps of cutting an amorphous strip into a plurality of amorphous alloy slices; cutting a plurality of metal thin sheets, coating the surfaces of the amorphous alloy slices and the metal thin sheets with diluted inorganic high-temperature glue, and laminating the plurality of amorphous alloy slices to a multi-layer lamination sheet, wherein the plurality of metal thin sheets are clamped in the multi-layer lamination sheet at intervals of a certain thickness; pasting the plurality of metal thin sheets on the two outermost end surfaces of the multi-layer lamination sheet to form a composite lamination sheet; clamping and curing the composite lamination sheet, processing small holes, carrying out linear cutting and annealing heat treatment, and spraying an anti-rust agent. According to the method, the influence of mechanical stress on the magnetic performance of amorphous alloy during the fabrication process of the stator iron core is finally reduced through thermal treatment; and the fabricated stator iron core is high in mechanical strength, positioning grooves are cut on an outer circle of a stator and are fixed with a motor base or a cooling water jacket by using non-conductive magnetic cylindrical pins, and thus, the influence of the mechanical stress on the magnetic performance of the stator iron core by a traditional fixing method or interference fit fixing is prevented.
Description
Technical field
The invention belongs to technical field of motor manufacture, particularly to the preparation method of amorphous alloy stator iron core。
Background technology
Amorphous alloy material has the advantage of pcrmeability height, exchange core loss low (core loss is 1st/1 to five/10ths of traditional silicon steel disc), and the application in the high-frequency electric machines field of Industrial Frequency Transformer, industrial frequency reactor, radio-frequency rector and transformator, high-speed electric expreess locomotive or many numbers of pole-pairs gets growing concern for。Such as high speed and precision grinding machine motor pole number is 4, and rotating speed is 36000r/min, and in stator core, the alternative frequency of fundamental wave magnetic field is 1200Hz；Driving motor for electric automobile, number of poles is 10, and when rotating speed is 12000r/min, stator current frequency is 1000Hz。High-speed electric expreess locomotive or high-frequency electric machines use amorphous alloy material to make stator core as stator core than stalloy can substantially reduce core loss, improves electric efficiency。But amorphous alloy material is more sensitive for mechanical stress, mechanical stress excessive when processing or assembling can be substantially reduced the magnetic property of amorphous alloy material。
The stator core of traditional silicon steel disc motor usually extrudes two to multiple breach in the cylindrical punching press of stator punching, in the axial direction multi-layer stator punching is applied when certain pressure laminates by multi-layer stacks being fixed into complete stator core in the way of cylindrical breach electric welding。
Also having shaping stator iron core method is be uniformly distributed to stamp out multiple dovetail groove on the cylindrical of silicon steel punched chip, multi-layer stator punching laminates and becomes stator core, elastic narrow steel plate is axially penetrated in dovetail groove, in stator core end, elastic narrow steel plate bending is become compression cramp, thus multi-layer stator punching being compressed is a complete stator core。
Or for the somewhat larger motor of stator outer diameter, stator punching cylindrical is uniformly distributed and stamps out 6 or multiple rectangular slot, multi-layer stator punching laminates and becomes stator core, steel annular pressure ring is placed at stator core two ends near cylindrical place, the axial rectangular slot of stator core is put into narrow steel plate, annular pressure ring at two ends is outer also to be overlapped narrow steel plate bending with pressure ring, when annular pressure ring and stator core are applied certain axial compressive force, by electric welding, narrow steel plate and end circular loop shape pressure ring are welded, so that stator core is existing as a whole, meet again certain stacking factor requirement。
These three mode compresses stator punching and all there is certain defect, no matter it is electric welding line or stator compression cramp, or axially the stray field of stator core cylindrical is all equivalent to mouse cage sliver by the narrow steel plate in rectangular slot, can produce and the electromotive force of the same frequency of stator winding, and directly and the steel annular pressure ring short circuit at stator punching or stator two ends, between stator punching, form extra electric current, increase the eddy-current loss of stator core。In order to avoid contacting of stator cramp and stator core, increase extra eddy-current loss, have and adopt the mode that steel compresses cramp set insulation sleeve to make cramp and stator core be not directly contacted with。
The stalloy motor higher for performance requirement or prototype design stage, first brush every stalloy with the acetal resin diluted through dehydrated alcohol two-sided each twice, after drying multi-disc stalloy fixture pressurizeed and keep certain time to solidify at a certain temperature, being cut into complete stator core through line afterwards。But acetal resin belongs to organic resin, maximum temperature is 155 degrees Celsius, is not suitable for non-crystaline amorphous metal 350 degrees Celsius and above heat treatment。
The assembly method of traditional silicon steel disc stator core and electric machine stand and cooling jacket is radially to install one or more screw jackscrew on support or cooling jacket directly stator core cylindrical to be applied radial force, in case fastening sub-iron core axially and radially vibration。
The Honeywell Corp. USA patent W099/66624 of 1986 discloses the amorphous alloy stator of a kind of efficient radial flux, and after the band of this stator different length is superimposed as arc or C shape, dipping is solidified into the toothed stator with radially direction。The stator structure that the method is formed includes substantial amounts of bubble between discrete amorphous state thin slice, adds the magnetic resistance of magnetic circuit, the partial offset advantage of amorphous alloy material high permeability, and motor needs more excitation magnetic kinetic potential or exciting current when running。
German patent DE 2805435 and DE2805438 disclose a kind of method preparing amorphous iron core stator, are that stator is divided into wound pieces and pole shoe, and nonmagnetic substance is inserted into the junction between wound pieces and pole shoe, and the lamination in wound pieces is connected to each other by welding。This method of attachment adds effective clearance, and improves the magnetic resistance of magnetic circuit accordingly。It addition, this method use be welded to connect amorphous metal lamination will make amorphous metal junction and near recrystallization, thus the magnetic resistance increased in stator and iron loss。
Amorphous powdered alloy and bonding agent, with conventional amorphous powdered alloy for raw material, are sufficiently mixed by patent of invention CN201010211940.7, then to be placed in mould by the amorphous powdered alloy after mixing bonding agent extrusion forming be amorphous alloy stator iron core。The utilization rate of this amorphous alloy stator iron core preparation method material is high, and waste material is few。But tool is manufactured for the stator core that stator grooved is more complicated acquire a certain degree of difficulty。This amorphous alloy stator iron core cylindrical is smooth, and patent of invention CN201010211940.7 does not provide the method fixing with electric machine stand or cooling jacket。
The preparation method that patent CN2008100007282.2 discloses a kind of used in high-speed motor amorphous alloy stator iron core, amorphous alloy strips is formed the amorphous alloy film stacking rod with predetermined thickness through cutting, laminating, stacking rod is annealed, binder-impregnated, cuts after solidification, form the stator core of required form and size。The method is cut after stator core heat treatment completes, and can introduce again new mechanical stress, reduce the magnetic property of amorphous alloy material。The standby stator core cylindrical of this patent system is smooth, does not provide the fixing means between stator core and electric machine stand or cooling jacket。
Summary of the invention
The deficiency that the present invention exists to overcome prior art, it is provided that the preparation method of a kind of amorphous alloy strips stator core。
Concrete technical scheme is:
The preparation method of amorphous alloy stator iron core, including procedure below:
(1) amorphous alloy strips is sheared the multi-disc amorphous alloy film becoming preliminary dimension；
(2) cutting out multi-disc same size foil, described foil material is following one simultaneously: high frequency stalloy, high-strength aluminum alloy thin slice or magnesium alloy thin slice, offers circular hole deburring in foil center；
(3) the inorganic high-temp glue of amorphous alloy film and foil surfaces coating dilution, the thickness of glue is less than 1 micron；
(4) multi-disc amorphous alloy film is laminated into multi-layer stacks, in multi-layer stacks, accompany multi-disc foil at interval of certain thickness；Both ends of the surface patch multi-disc foil at the outermost of multi-layer stacks forms composite laminate, the not cementing of the foil lateral surface of outermost face；
(5) composite laminate pair of aluminum alloy sheets or epoxy glass laminate are clamped, and apply pressure, solidify in high temperature oven；
(6) from outermost foil circular hole position electricity consumption spark method, the composite laminate solidified axially being processed small sircle hole, small sircle hole diameter is less than or equal to the circular hole of foil, and small sircle hole axially penetrates through whole composite laminate；
(7) by stator core design size, composite laminate is cut into stator core with wire cutting method, namely cut out the semicircle locating slot on stator inner circle, stator teeth groove, stator cylindrical and cylindrical；
(8) stator core after having cut is annealed heat treatment, applies magnetic field at stator core circumferencial direction during annealing heat treatment, or apply the magnetic field that during with motor actual motion, magnetic line of force direction is identical；
(9) to through Overheating Treatment the stator core rust prevention by applying liquid material agent that cools down。
The preparation method of the amorphous alloy stator iron core of the offer of the present invention compared with prior art, has the following characteristics that
Owing to amorphous alloy material is stone, and crisp, be therefore not suitable for, with conventional machining method processing such as punching press, cutting, brills, adopting electric discharge machining method。
The magnetic property of amorphous alloy material is very sensitive to mechanical stress。The two ends of amorphous alloy stator iron core and middle increase high frequency stalloy, high-strength aluminum alloy thin slice or magnesium alloy thin slice, add amorphous alloy stator tooth top and the mechanical strength of core ends tooth, reduce the adverse effect that amorphous alloy stator magnetic property is produced by the stator core mechanical stress that slot wedge and winding overhang shaping cause in rule process。
With the bonding amorphous alloy film of high temperature inorganic glue so that stator core is capable of withstanding high temperature when machining after-baking。
Whole stator core carries out heat treatment again after machining, if shifting to an earlier date first heat treatment, following process can bring new mechanical stress；
Stator cylindrical cuts out locating slot, and fix with motor cooling jacket or out frame by the not magnetic conduction cylindrical pins such as epoxy glass fiber or politef or modification of nylon PA66, making stator core is Multi-contact with support or cooling jacket, both moment of torsion had been delivered in a circumferential direction, make stator core will not vibration in a circumferential direction, turn avoid the impact on stator core magnetic property of the local pressure of common fixation methods。
Accompanying drawing explanation
Fig. 1 is that embodiment amorphous alloy stator iron core laminates process schematic representation。
Fig. 2 is the sectional view of embodiment amorphous alloy stator iron core。
Fig. 3 is embodiment two ends and the middle amorphous alloy stator iron core left view increasing high frequency stalloy。
The schematic diagram of the red copper thin cylinder in circumferencial direction magnetic field is applied when Fig. 4 is embodiment amorphous alloy stator iron core heat treatment。
Fig. 5 is embodiment two ends is high frequency stalloy, the middle amorphous alloy stator iron core left view increasing aluminum alloy flake。
Rotating excitation field inner stator sectional view is applied when Fig. 6 is embodiment amorphous alloy stator iron core heat treatment。
Detailed description of the invention
The present invention is illustrated as follows below in conjunction with accompanying drawing and preferred embodiment:
Embodiment 1
The method according to the invention, specifically comprising the following steps that of amorphous alloy stator iron core preparation method
1) by non-crystaline amorphous metal Fe83.5B15Cu1.5The multi-disc amorphous alloy film become through shearing growth 250mm, wide 140mm sheared by band。
2) cut out 15 length of a film 250mm, wide 140mm, thickness are the high frequency stalloy of 0.2mm simultaneously, and bore two diameters at the place opening bit of high frequency stalloy centerline 125mm and be the circular hole of 20mm deburring。
3) amorphous alloy film and high frequency stalloy are brushed with the silicate inorganic high temperature glue that heatproof is 500 degrees Celsius, the concentration of high temperature glue is adjusted, it is ensured that the thickness of the every topcoating brush coating water of amorphous alloy film, high frequency stalloy is less than 1 micron by adding the concentration dehydrated alcohol more than more than 96% in high temperature glue。Two panels high frequency stalloy one side is wherein had to brush high temperature glue。Before brushing high temperature glue, it is necessary to amorphous alloy film and high frequency stalloy are preheating to 60 degrees Celsius。
4) amorphous alloy film of multi-disc brushing high temperature glue being laminated into multi-laminate rod 1, when laminating non-crystaline amorphous metal, respectively place five high frequency stalloys 5 at the two ends of multi-laminate rod 1, wherein the not coated face of two panels single spreading water high frequency stalloy is towards the outer end of iron core。
5) when laminating amorphous alloy film, in the centre position of non-crystaline amorphous metal multi-laminate rod 1, axial length is placed through the position of 32mm the high frequency stalloy 6 of five two-sided brushing high temperature glue。
6) the aluminium alloy pressing plate 2 that two pieces of thickness of Structures of Multilayers Amorphous Alloys lamination is 20mm adding high frequency stalloy is clamped, and by uniformly fastening six nuts 3 and bolt 4 applies the pressure of 80MPa。Wherein it is used for clamping the upper aluminium alloy plate 2 of non-crystaline amorphous metal multi-layer stacks and lower aluminium alloy clamping plate 7 require that two clamping faces are smooth, smooth and are parallel to each other。Structures of Multilayers Amorphous Alloys lamination is placed in high temperature oven, and temperature controls to solidify 15 minutes at 180～220 degrees Celsius, furnace cooling afterwards。
Laminate the process schematic representation of Structures of Multilayers Amorphous Alloys lamination as shown in Figure 1。
7) the non-crystaline amorphous metal multi-laminate rod solidified is processed, from the axial electricity consumption spark method in end face high frequency stalloy circular hole position, the circular hole that a diameter is 16mm, this circular hole axially penetrates through whole non-crystaline amorphous metal multi-laminate rod, so that through line cutting molybdenum filament when cutting on line stator core inner circle and teeth groove, this axial centre axially bored line overlaps as far as possible with stator core axis。
8) the non-crystaline amorphous metal multi-laminate rod after solidifying being cut into two stator core blanks, the length, width and height of blank are respectively as follows: 140mm, 125mm and 67mm。Then cut out by stator core designing requirement on stator inner circle and stator teeth groove, stator cylindrical and cylindrical for the semicircle locating slot 9 with electric machine stand or cooling jacket location。In stator, circular diameter is 60.2mm, and outside diameter is 115mm, and stator has 24 grooves to be uniformly distributed。Wherein the radius of the semicircle locating slot on stator cylindrical is 1.6mm, its processing method is: be uniformly distributed at stator core cylindrical, just to the position at the bottom of stator slot along stator core axially cutting go out three radiuses be the semicircle locating slot 9 of 1.6mm, the axis of semicircle locating slot 9 is all parallel with the axis of stator core inner circle, and notch is along stator radial direction outwardly。Semicircle locating slot 9 on these stator cylindricals and the semicircle locating slot on electric machine stand or cooling jacket also are used for together with epoxy glass fiber cylindrical pins fixing amorphous alloy stator iron core in a circumferential direction。As shown in Figure 2, left view is as shown in Figure 3 for amorphous alloy stator iron core sectional view after having cut。
9) amorphous alloy stator iron core after having cut being annealed heat treatment, to remove mechanical stress, annealing heat treatment carries out in the bell furnace of full nitrogen。Annealing temperature is 390 degrees Celsius, and the time is 15 minutes, furnace cooling afterwards。Apply the magnetic field of some strength at stator core circumferencial direction during annealing heat treatment, concrete grammar is to place the red copper cylinder 10 that walled thickness is 1mm as shown in Figure 4 in stator core 8 inner circle, the air gap of 0.3mm is had between red copper cylinder 10 and stator core 8, and pass into the DC current of 3～5A by binding post 11, until furnace temperature cooling is room temperature。
9) antirust treatment is carried out to spraying rare epoxy resin through Overheating Treatment the amorphous alloy stator iron core that cools down。
So far prepared by two ends and the middle amorphous alloy stator iron core increasing high frequency stalloy。
Embodiment 2
The method according to the invention, specifically comprising the following steps that of amorphous alloy stator iron core preparation method
1) by non-crystaline amorphous metal Fe85B11Si4.0The multi-disc amorphous alloy film become through shearing growth 250mm, wide 140mm sheared by band。
2) cut out 10 length of a film 250mm, wide 140mm, thickness are the high frequency stalloy of 0.2mm simultaneously。Cut out 10 250mm again, wide 140mm, thickness are the high-strength aluminum alloy 7075-T651 thin slice of 0.2mm, and bore two diameters at the place opening bit of high frequency stalloy and aluminum alloy flake centerline 125mm and be the circular hole of 20mm deburring。
3) amorphous alloy film and high frequency stalloy are brushed with the silicate inorganic high temperature glue that heatproof is 500 degrees Celsius, the concentration of high temperature glue is adjusted, it is ensured that the thickness of the every topcoating brush coating water of amorphous alloy film, high frequency stalloy and high-strength aluminum alloy thin slice is less than 1 micron by adding the concentration dehydrated alcohol more than more than 96% in high temperature glue。Two panels high frequency stalloy one side is wherein had to brush high temperature glue。Before brushing high temperature glue, amorphous alloy film and high frequency stalloy are preheating to 60 degrees Celsius。
4) amorphous alloy film of multi-disc brushing high temperature glue laminating into multi-laminate rod, when laminating non-crystaline amorphous metal, respectively places five high frequency stalloys 5 at the two ends of multi-laminate rod, wherein the not coated face of two panels single spreading water high frequency stalloy is towards the outer end of iron core。
5), when laminating amorphous alloy film, in the centre position of non-crystaline amorphous metal multi-laminate rod, axial length is often placed through the position of 21mm the high-strength aluminum alloy 7075-T651 thin slice 6 of five two-sided brushing high temperature glue。
6) upper aluminium alloy plate 2 that two pieces of thickness of the Structures of Multilayers Amorphous Alloys lamination of high frequency stalloy and high-strength aluminum alloy thin slice is 20mm will be added and lower aluminium alloy clamping plate 7 clamp, and by uniformly fastening six nuts 3 and bolt 4 applies the pressure of 80MPa。Wherein it is used for clamping the aluminium alloy plate 2 of non-crystaline amorphous metal multi-layer stacks and requires that two clamping faces are smooth, smooth and are parallel to each other。Structures of Multilayers Amorphous Alloys lamination is placed in high temperature oven, and temperature controls to solidify 15 minutes at 180～220 degrees Celsius, furnace cooling afterwards。
Laminate the process schematic representation of Structures of Multilayers Amorphous Alloys lamination as shown in Figure 1。
7) the non-crystaline amorphous metal multi-laminate rod solidified is processed, from the axial electricity consumption spark method in end face high frequency stalloy circular hole position, the circular hole that a diameter is 16mm, this circular hole axially penetrates through whole non-crystaline amorphous metal multi-laminate rod, so that through line cutting molybdenum filament when cutting on line stator core inner circle and teeth groove, this axial centre axially bored line overlaps as far as possible with stator core axis。
8) the non-crystaline amorphous metal multi-laminate rod after solidifying being cut into two stator core blanks, the length, width and height of blank are respectively as follows: 140mm, 125mm and 67mm。Then cut out by stator core designing requirement on stator inner circle and stator teeth groove, stator cylindrical and cylindrical for the semicircle locating slot 9 with electric machine stand or cooling jacket location。In stator, circular diameter is 60.2mm, and outside diameter is 115mm, and stator has 24 grooves to be uniformly distributed。Wherein the radius of the semicircle locating slot on stator cylindrical is 1.6mm, its processing method is: be uniformly distributed at stator core cylindrical, just to the position at the bottom of stator slot along stator core axially cutting go out three radiuses be the semicircle locating slot 9 of 1.6mm, the axis of semicircle locating slot 9 is all parallel with the axis of stator core inner circle, and notch is along stator radial direction outwardly。Semicircle locating slot 9 on these stator cylindricals is used for fixing amorphous alloy stator iron core in a circumferential direction together with the semicircle locating slot 9 also modification of nylon PA66 cylindrical pins on electric machine stand or cooling jacket。As shown in Figure 2, left view is as shown in Figure 5 for amorphous alloy stator iron core sectional view after having cut。
9) amorphous alloy stator iron core after having cut being annealed heat treatment, to remove mechanical stress, annealing heat treatment carries out in the bell furnace of full nitrogen。Annealing temperature is 380 degrees Celsius, and temperature retention time is 75 minutes, furnace cooling afterwards。In stator core, the magnetic field of the some strength that magnetic line of force direction is identical during with motor actual motion is applied during annealing heat treatment。Concrete grammar is to place inner stator as shown in Figure 6 in stator core inner circle, this stator is 24 grooves equally, the axial length of inner stator is 70mm, external diameter is 59.8mm, the air gap of 0.2mm is had between interior external stator, the iron core of inner stator is ordinary silicon steel disc, the number of pole-pairs with amorphous alloy iron core of three-phase windings design is identical, winding is the red copper wire with earthenware insulation, single-layer winding structure of single, every groove conductor number is 4, and pass into 3～6A alternating current of three-phase 50Hz to produce rotating excitation field by binding post, induction in amorphous alloy stator patch iron core is about 0.1～0.2T, until furnace temperature cooling is room temperature。
9) antirust treatment is carried out to spraying rare varnish through Overheating Treatment the amorphous alloy stator iron core that cools down。
High frequency stalloy is increased with described two ends, the middle stator core increasing high-strength aluminum alloy thin slice designs quadrupole high-speed permanent magnet motor, the two-dimensional magnetic Miyun figure of non-crystaline amorphous metal part shows, make near it in stator cylindrical cutting location semi-circular groove that the magnetic of non-crystaline amorphous metal is close to be increased to some extent, but still in tolerance interval。Find out the pcrmeability of the pcrmeability closely vacuum due to aluminium alloy from the two-dimensional magnetic Miyun figure of aluminium alloy part, the magnetic of stator aluminium alloy part is close non-normally low, and therefore A.C.power loss is just non-normally low。
Prepared by the amorphous alloy stator iron core so far increasing high frequency stalloy and high-strength aluminum alloy thin slice。
The foregoing is only highly preferred embodiment of the present invention, not be used for limiting scope of the invention process, all equal changes done according to the scope of the claims of the present invention with modify, fall within the covering scope of present invention。
Claims (1)
1. the preparation method of amorphous alloy stator iron core, it is characterised in that include procedure below:
(1) amorphous alloy strips is sheared the multi-disc amorphous alloy film becoming preliminary dimension；
(2) cutting out multi-disc same size foil, described foil material is following one simultaneously: high frequency stalloy, high-strength aluminum alloy thin slice or magnesium alloy thin slice, offers circular hole deburring in foil center；
(3) the inorganic high-temp glue of amorphous alloy film and foil surfaces coating dilution, the thickness of glue is less than 1 micron；
(4) multi-disc amorphous alloy film is laminated into multi-layer stacks, in multi-layer stacks, accompany multi-disc foil at interval of certain thickness；Both ends of the surface patch multi-disc foil at the outermost of multi-layer stacks forms composite laminate, the not cementing of the foil lateral surface of outermost face；
(5) composite laminate pair of aluminum alloy sheets or epoxy glass laminate are clamped, and apply pressure, solidify in high temperature oven；
(6) from outermost foil circular hole position electricity consumption spark method, the composite laminate solidified axially being processed small sircle hole, small sircle hole diameter is less than or equal to the circular hole of foil, and small sircle hole axially penetrates through whole composite laminate；
(7) by stator core design size, composite laminate is cut into stator core with wire cutting method, namely cut out the semicircle locating slot on stator inner circle, stator teeth groove, stator cylindrical and cylindrical；
(8) stator core after having cut is annealed heat treatment, applies magnetic field at stator core circumferencial direction during annealing heat treatment, or apply the magnetic field that during with motor actual motion, magnetic line of force direction is identical；
(9) to through Overheating Treatment the stator core rust prevention by applying liquid material agent that cools down。
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| CN115008862A (en) * | 2022-06-20 | 2022-09-06 | 青岛云路先进材料技术股份有限公司 | Amorphous alloy strip laminating method, amorphous alloy iron core and axial motor |
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