CN204131349U - Axial-gap permanent-magnet synchronous motor - Google Patents
Axial-gap permanent-magnet synchronous motor Download PDFInfo
- Publication number
- CN204131349U CN204131349U CN201420439341.4U CN201420439341U CN204131349U CN 204131349 U CN204131349 U CN 204131349U CN 201420439341 U CN201420439341 U CN 201420439341U CN 204131349 U CN204131349 U CN 204131349U
- Authority
- CN
- China
- Prior art keywords
- brush
- axial
- fan
- synchronous motor
- magnet synchronous
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
- H02K7/14—Structural association with mechanical loads, e.g. with hand-held machine tools or fans
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K5/00—Casings; Enclosures; Supports
- H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
- H02K5/18—Casings or enclosures characterised by the shape, form or construction thereof with ribs or fins for improving heat transfer
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Motor Or Generator Frames (AREA)
- Permanent Field Magnets Of Synchronous Machinery (AREA)
Abstract
The utility model provides a kind of axial-gap permanent-magnet synchronous motor.The driving of permanent-magnet synchronous motor needs with inverter, but does not consider the bearing galvanic corrosion that Driven by inverter causes in the past.Shaft current is the reason of galvanic corrosion, and bearing life is shortened, and electric current when therefore needing to reduce the voltage and electric discharge that produce between bearing enclose, as the stage before this, needs the shaft voltage reducing motor.For solving this problem, axial-gap permanent-magnet synchronous motor of the present utility model comprises: two rotors rotated centered by axle; Stator, it is configured in the axial direction folded by two rotors; Bearing; With the housing of insulating resin fixed stator; Keep bearing and make the totally enclosed end cap of stators and rotators; Be configured in the fan of the axial end portion of end cap; And the brush to contact with the axial end of fan, the axial end of fan is made up of the alloy of cupric, and brush contains carbon; At the axial end of fan, also there is the pressing mechanism to brush pressurization.
Description
Technical field
The utility model relates to the structure of the axial-gap permanent-magnet synchronous motor in the axial direction with gap.
Background technology
In recent years, in commercial plant and household appliances, automobile component etc., more and more pay attention to the necessity of energy-saving.Current, the TV university part produced in the power stations such as domestic firepower, waterpower, atomic energy, wind-force is produced by the electric rotating machine (generator) as electromagnetic application product.In addition, over halfly in the power consumption of domestic use to be consumed by the driving of electric rotating machine.
In the electromagnetic application products such as these electric rotating machines, the means realizing the high efficiency of these products soft magnetic material are used for core part, reduces the loss of this core part.
In addition, other methods of raising the efficiency have by using the permanent magnet that magnetic force is high, the magnetic torque (magnet torque) of every rated current is increased, obtain required torque with lower electric current, thus reduce the method for the loss (copper loss) that the Joule heat of conductor that produces because of electric current causes.As the method for the high efficiency of permanent magnet electric motor, the method for installing the strong magnets such as neodymium sintered magnet can be considered.But the material for such magnet contains the rare metal of place of production digging that can only be limited in the world, so have the problem such as environmental problem and rise in price.
So, alternatively, use mass-produced ferrite lattice from the past to increase to the necessity realizing high efficiency.As motor high efficiency method when use ferrite lattice, Japanese Unexamined Patent Publication 2010-115069 publication (patent documentation 1) can be enumerated.In patent documentation 1, propose a kind of motor of following structure, consist of the soft magnetic material in order to the iron core being used for using in permanent magnet electric motor by the amorphous of low loss, adopt the motor of axial-gap, and then in order to reduce copper loss, the structure that to adopt using the two sides of axis be rotor is as the structure of volume (volume) increasing permanent magnet.
Prior art document
Patent documentation
Patent documentation 1: Japanese Unexamined Patent Publication 2010-115069 publication
Utility model content
Utility model wants the technical problem solved
Because the motor of above-mentioned patent documentation 1 is permanent-magnet synchronous motor, need to use inverter so it drives.But, in patent documentation 1, do not consider the bearing galvanic corrosion that Driven by inverter causes.
Bearing galvanic corrosion is the corrosion phenomenon of bearing, occurs because of following mechanism.That is, in the structure contacted with motor rotation axis at bearing outer ring and body contact, bearing inner race, the variation in voltage that rotating shaft occurs when inverter is used, so produce the potential difference of motor rotation axis and housing between the Internal and external cycle of bearing.When potential difference reaches more than the resistance to insulating properties of bearing film, flow through shaft current because of oil film insulation breakdown.Shaft current is the reason of galvanic corrosion (because flowing through electric current between metal, the metallic atom losing electric charge is as Ion release thus make the phenomenon of corrosion of metals), and bearing life is shortened.
Thus electric current when needing to reduce the voltage and electric discharge that produce between bearing enclose, in addition, as the stage before this, needs the shaft voltage reducing motor.
The shaft voltage of motor produces the voltage synchronous with the winding neutral point voltage (being also referred to as common-mode voltage) produced under the on off state of inverter in axle.The producing cause of this shaft voltage is because electric coupling occurs and produces from winding because of resistance and electrostatic capacitance between the path of armature spindle.
Patent documentation 1 the amorphous core of low loss is used for stator core have in the axial gap electric motor of two rotors, the iron core of stator is adopted to be divided into multiple, the cross sectional shape of this iron core has the structure of identical cross sectional shape in the axial direction, and around this iron core, configuration has the stator winding with the inner peripheral surface of the outer peripheral face similar shape of stator core.Therefore, at the axial end portion of winding, becoming the structure that stator winding and rotor magnet or rotor core portion configure opposite to each other across gap, is the structure increasing electrostatic capacitance.
In addition, stator core is the structure that is separately kept of multiple iron core in the stator, is be difficult to the structure with earthing potential electric coupling such as shells (housing).Therefore, the electric coupling degree that there is winding and axle reduces, the technical problem that shaft voltage raises.When shaft voltage raises, the resistance to insulating properties of bearing film can be exceeded as mentioned above, so be easy to discharge at bearing portion, bearing galvanic corrosion occur, until the time of breaking down may shorten.
For the technical scheme of dealing with problems
In order to solve the problem, such as, adopt the structure recorded in claims.The utility model comprises the multiple technical scheme solved the problem, and when enumerating one example, comprising: two rotors rotated centered by axle; Stator, it is configured to above-mentioned axially folded by above-mentioned two rotors; Bearing; The housing (case housing) of said stator is fixed with insulating resin; Keep above-mentioned bearing and make said stator and the totally enclosed end cap of above-mentioned rotor (end bracket); Be configured in the fan (fan) of the axial end portion of above-mentioned end cap; And the brush (brush) to contact with the axial end of said fans, the axial end of said fans is made up of the alloy of cupric, and above-mentioned brush contains carbon; At the axial end of said fans, also there is the pressing mechanism pressurizeed to above-mentioned brush.
Utility model effect
According to the utility model, a kind of axial-gap permanent-magnet synchronous motor that can reduce shaft voltage can be provided.
Accompanying drawing explanation
Fig. 1 (a) and Fig. 1 (b) is the sectional view of the brush being configured in shaft rear end portion of the axial-gap permanent-magnet synchronous motor representing embodiment 1 and the position relationship of brush holder (brush holder).
Fig. 2 (a) ~ Fig. 2 (c) is the stereogram of structure representing the brush of embodiment 1 and brush holder, screw.
Fig. 3 is the stereogram of the structure of the motor part of the axial-gap permanent-magnet synchronous motor representing embodiment 1.
Fig. 4 (a) and Fig. 4 (b) is the stereogram of the structure of the stator core of the axial-gap permanent-magnet synchronous motor representing embodiment 1.
Fig. 5 is the stereogram of position relationship of the stator of the axial-gap permanent-magnet synchronous motor representing embodiment 1 and rotor, shell (housing).
Fig. 6 is the sectional view of position relationship of the stator of the axial-gap permanent-magnet synchronous motor representing the present embodiment and rotor, shell.
Fig. 7 is the sectional view of position relationship representing the stator of existing general radial clearance motor and rotor, shell.
Fig. 8 is the figure of the basic conception figure representing inverter.
Fig. 9 (a) ~ Fig. 9 (d) is the figure of the common-mode voltage under each on off state that inverter is described.
Figure 10 is the equivalent circuit figure represented as the simple model (model) of electrostatic capacitance and resistance electric coupling by each structure member of motor.
Figure 11 (a) ~ Figure 11 (c) represents that the axial-gap permanent-magnet synchronous motor by embodiment 4 is used for the figure of the example of industrial use.
Figure 12 (a) ~ Figure 12 (d) is the sectional view being configured in the brush in shaft rear end portion and the position relationship of brush holder of the axial-gap permanent-magnet synchronous motor represented in embodiment 2.
Figure 13 (a) and Figure 13 (b) is the sectional view being configured in the brush in shaft rear end portion and the position relationship of brush holder of the axial-gap permanent-magnet synchronous motor represented in embodiment 3.
Description of reference numerals
1 ... fan guard, 2 ... brush holder, 3 ... brush, 4 ... pigtail (pigtail), 5 ... circular crimp type terminal, 6 ... counter-sunk screw, 7 ... Compress Spring, 8 ... screw, 9 ... trim ring (collar) pressed by fan, 10 ... radial fan, 11 ... key (key), 12 ... end cap (end bracket), 13 ... bearing, 15 ... sawtooth (serration) groove, 16 ... grooving, 17 ... screw, 18 ... brush retention groove, 19 ... axle (shaft), 20 ... rotor, 21 ... rotor push nut, 22 ... rotor yoke, 23 ... back of the body yoke (back yoke), 24 ... permanent magnet, 30 ... stator, 31 ... stator core, 32 ... stator winding, 33 ... winding drum stand (bobbin), 34 ... overlap joint line (jumper), 35 ... annulus (ring sleeve), 36 ... polyvinyl chloride (vinyl) covered electric cable, 40 ... housing, 45 ... pump, 46 ... fan, 47 ... hoist engine, 50 ... axial-gap permanent-magnet synchronous motor.
Embodiment
Below, with accompanying drawing, embodiment of the present utility model is described.
[embodiment 1]
Fig. 6 sectional view represents the structure of axial-gap permanent-magnet synchronous motor.In Fig. 6,31 is stator cores, and 32 is stator winding, and the stator be made up of them is filled by insulating resin and is fixed on housing 40.In addition, two rotors be made up of rotor yoke 22 and permanent magnet 24 configure in the mode clipping stator on axle (shaft) 19 direction of motor.In addition, the bearing 13 utilizing formation to be configured at the bearing of the end cap 12 be combined with housing 40 rotatably keeps rotor.
In addition, Fig. 7 represents the sectional view of the radial gap type permanent-magnet synchronous motor of existing type.
Permanent-magnet synchronous motor, for the viewpoint of effective use of energy sources, generally speaking uses at pump, forced draft fan etc. in the application of motor and utilizes inverter control as required and the torque of fixed the best, rotating speed operate.Fig. 8 represents the basic conception figure of inverter.Wherein, about motor portion, for ease of representing neutral point, winding is described as star-star connection.In addition, because delta connection and star-star connection can be changed mutually, star-star connection is assumed to be also without loss of generality.
DC-to-AC converter by source power supply is converted to direct current converter unit, make the level and smooth smoothing circuit of the pulsating voltage of transducer and formed by (narrow sense) inverter section that the switch motion under high frequency makes the average phase voltages of unit interval at random change.When being assumed to be desirable symmetrical three-phase equilibrium voltage, the voltage of the neutral point of motor does not change along with the time, is constant.The alternating voltage that DC-to-AC converter generates is applied to each phase of motor as symmetrical three-phase equilibrium voltage, but in the DC-to-AC converter of reality, inverter section only carries out ON/OFF (ON/OFF) action substantially, so winding neutral point voltage is not steady state value, always changes.This voltage is called as common-mode voltage.The shaft voltage of motor produces because of this common-mode voltage.
Fig. 9 (a) ~ Fig. 9 (d) represents the common-mode voltage under each on off state.Wherein, in Fig. 9 (a) ~ Fig. 9 (d), in order to simply, power semiconductor is described as switch.Herein, if smoothing circuit both end voltage is E, when smoothing circuit central authorities are set-point, the common-mode voltage under each on off state can get E/2, E/6 ,-E/6 ,-E/2 as shown in the figure.
Path from winding neutral point potential to ground (earth) exists two kinds.One is winding → stator core → housing, and another kind is winding → stator core → rotor core → axle → bearing → end cap → housing.These paths show as the path of electrostatic capacitance and resistance electric coupling.Because resistance is very little so ignore, Figure 10 represents the equivalent circuit after the most merely modelling.Herein, Cwr is the electrostatic capacitance between winding and rotor (rotor), and Crf is the electrostatic capacitance between rotor and housing, and Cb is the electrostatic capacitance between bearing enclose.Wherein, bearing exists multiple, but in order to simply be recited as combined capacity.
Shaft voltage can be expressed as shown in the formula (1) Suo Shi relative to the ratio (Bearing Voltage Ratio, hereinafter referred to as BVR) of global voltage.
BVR＝Cwr/(Cwr+Crf+Cb)……(1)
If when common-mode voltage is Ecp, the crest voltage Vsp of shaft voltage is as shown in the formula shown in (2).
Vsp＝BVR×Ecp……(2)
Common-mode voltage Ecp is determined by the action of inverter as mentioned above, so known shaft voltage and BVR produce pro rata.Therefore, the electrostatic capacitance of the electrostatic capacitance that each portion of known motor produces and bearing is less, more can reduce BVR.
About the electrostatic capacitance that each portion of motor produces, if two electric conductors are relative across insulant, then form capacitor at this place.The electric capacity of capacitor is determined by geometric factors such as forming the shape of conductor of capacitor and the configuration relation of two conductors.That is, can express by formula that is proportional with relative area, that be inversely proportional to its distance.
When axial-gap permanent-magnet synchronous motor shown in Fig. 6, the face of known stator winding and rotor, the relative area between stator winding and housing are comparatively large, and the electrostatic capacitance of Cwr increases.On the contrary, about the radial gap type permanent-magnet synchronous motor shown in Fig. 7, known stator 30 is connected to become zero potential (ground connection) with housing 40, and Cwr reduces.Therefore, the BVR of axialmode compared with radial mode large several times to tens times.So shaft voltage is higher compared with the radial mode motor of common Driven by inverter, in axle, there is the voltage of some tens of volts.So, because there is higher voltage, discharge at bearing film, cause galvanic corrosion.
So, as the method making the potential drop produced in this axle be low to moderate zero potential (ground connection) side, carry out ground connection with grounding brush (earth brush).In common radial mode, shaft voltage is higher also only produces number about V, so need to make axle contact well with brush, thus reduces the resistance of contact site.For this reason, need the contact area guaranteeing contact site comparatively large, and the press pressure of brush is set higher, there is mechanical friction and cause the reduction of motor efficiency and the abrasion of brush to cause the problems such as service life reduction, adopt hardly in actual product.
In the axial-gap permanent-magnet synchronous motor of the present embodiment, produce the shaft voltage of some tens of volts, even if so contact resistance is less, also in brush contact site, reliably electric current is flow through, therefore contact area can be less, in addition, with friction with wear away the little but carbon brush that resistance value is high and also can form.In addition, because contact also can reduce, so can suppress less by abrasion loss, industrial motor can be interchangeably applied to without the need to what carry out brush.
Fig. 1 (a) and Fig. 1 (b) represents the sectional view being configured in the brush in shaft rear end portion and the position relationship of brush holder at the axial-gap permanent-magnet synchronous motor of the present embodiment.Fig. 1 (a) is enlarged drawing, and Fig. 1 (b) is overall diagram.In Fig. 1 (a) and Fig. 1 (b), at the central portion of the fan guard 1 be connected with housing 40 by construction bolt, be configured with the hole for installing cylindric brush holder 2.This hole is the screw head of counter-sunk screw 6 is not cone (taper) shape highlightedly, and passes through fastening for counter-sunk screw 6 structure fixing cylindric brush holder 2.At the middle body of brush holder 2, being configured with the screw for being screwed in illustrated left side, being configured with the groove keeping brush in the axial direction slidably of the groove shape corresponding with brush outer shape for configuring brush 3 in right side.In addition, there is the pressing mechanism configuring Compress Spring 7 and pressurize to axial motors side (figure being right direction) to brush between the leading section and brush-rear end of counter-sunk screw.This brush is made up of the raw material (blank) taking carbon as main material compression molding.
Fig. 2 (a) ~ Fig. 2 (c) represents the stereogram of the structure of brush and brush holder part.Fig. 2 (a) represents the structure of brush 3.Brush 3 has the cross section of roughly quadrangle, and its leading section is formed with the groove being called as sawtooth portion 15.This is initial contact in order to improve brush and sliding surface and reduces the shape of initial contact area.In addition, in the one side of this brush 3, by being welded with the connecting line 4 (hereinafter being referred to as pigtail herein) of stranded wire conductor.In addition, be configured to be connected with circular crimp type terminal 5 in the front end of this pigtail.This circular crimp type terminal 5 is by above-mentioned counter-sunk screw 6, is configured in the structure also with screw fastening between fan guard 1 and brush holder 2.
Fig. 2 (b) represents the stereogram through the Sketch of internal representation brush holder 2.In the present embodiment, at the middle body of the brush holder 2 of cylindrical shape, there is the brush retention groove 18 with roughly quadrangular section for configuring brush 3, there is in its opposition side the cylindrical portion for configuring Compress Spring 7 and the screw 17 as threaded portion.In addition, being configured to a part for the circumference at cylinder, being provided with the grooving 16 for making pigtail 4 pass through.In this brush holder 2, insert configuration with the brush 3 of pigtail, to utilize the fan guard 1 of the electric conductors such as metal and the fixing structure of circular crimp type terminal counter-sunk screw 6 screw thread under the state inserting Compress Spring 7, keep brush 3.Brush 3 itself have by Compress Spring 7 to motor reel to eject direction on pressurizeing, but remained the structure that can not eject by pigtail 4.
Wherein, brush holder 2 is fixed by counter-sunk screw 6 and fan guard 1, thus has the effect that directly can use existing fan guard, but is not limited thereto, and such as, brush holder 2 and fan guard 1 also can be integrative-structures.By adopting integrative-structure, there is the effect of assembling and becoming simple.
In Fig. 1 (a) and Fig. 1 (b), at the shaft end of the motor that brush-tip end contacts, be provided with radial fan 10, as the fan for making the shell of motor cool.This radial fan 10 be fixed on the axle 19 of motor from end cap portions to the shaft portion of the structure outstanding with outlet side opposition side, the bearing 13 being configured the bearing being configured at end cap 12 rotatably keeps.Radial fan 10 pairs of axles be fixedly such structure: in a part for the direction of rotation of axle, there is keyway, in this splined portion, insert key 11 is fixed on axle in the mode making it not slide in a rotational direction, and then, arrange the circle (collar) 9 of radial fan in the cylindrical shape of axially pressing, this circle 9 is fastening with the screw 8 of head of the shape having turret head or 2 faces have been carried out to chamfering, carry out fixing to axle axially.
Fig. 2 (c) represents the structure of the screw 8 as installation portion radial fan being installed to axle.The axial end of the head part of screw 8 has smooth face, and its surface roughness is mirror status.In addition, this head of screw is made up of the alloy of the cuprics such as brass.To adopt on this tabular surface above-mentioned brush-tip end on one side by Compress Spring pressurization while the structure pressed, adopt its contact site in the lower dynamic structure of sliding in state of spin friction.The axle 19 of motor, by configuration rotor 20 and keyway, is fixed, in a rotational direction by rotor push nut 21 fixed configurations in the axial direction.Rotor 20 in this embodiment is the structures with back of the body yoke 23 and permanent magnet 24.
According to above structure, even if when producing shaft voltage, electric current also passes through the fastening screw of fan and brush, pigtail from axle, via the construction bolt of metal fan guard, fan guard, housing and conductive component to the flowing of earthing potential direction, so the generation of the bearing galvanic corrosion destroying bearing film can be suppressed.
Fig. 3 represents the stereogram of the electric motor structure of the axial-gap permanent-magnet synchronous motor of the present embodiment.Axial-gap permanent-magnet synchronous motor has a stator 30 being configured in axial central portion and is configured in the having with the structure of the rotor 20 of the face of the circle magnet face relative with stator of this axial both ends.
Rotor 20 is the structures utilizing the fixing meanss such as bonding agent to be integrally constituted with the rotor yoke 22 be made up of magnet by circular permanent magnet 24.Permanent magnet 24 can use circular one annular magnet, but because of the relation etc. of size be difficult to make when, also the group of magnets being divided into polylith can be combined into circular use.
In addition, this permanent magnet 24 magnetizes in the mode that N pole and S pole alternately configure in the circumferential and is formed.The situation that present embodiment illustrates 14 poles of its number of poles shown in Fig. 3.The shape of each pole is fan shape in the mode amassed for equal angles, same cross-sectional in the circumferential.In the present embodiment, fan-shaped subtended angle is 360/14 degree namely about 25.7 degree.
Usually, in the permanent-magnet synchronous motor of three-phase, the relation of the number of poles of the rotor of motor and stator poles (groove) is generally 2: 3.One of magnetic motor extremely to being be made up of in a pair the N pole of magnet and S pole.When threephase motor, be the structure being configured with the winding of three-phase this pole centering of a pair, so be the relation of two pole of magnets and three stator poles.In the present embodiment, being configured to stator poles is 12 and 12 grooves, and pole of magnet is 14 poles, can expect amorphous metal to be applied to the iron loss that stator causes and reduce, so be the structure that can realize multipolarization.In addition, by multipolarization, estimate that induced voltage constant (torque constant) can increase.Such combination is multiple in addition in addition, and when 12 groove, the relation by 2: 3 should be 8 poles, but also can adopt 10 poles.When groove number is 9, is 6 poles originally, but 8 poles, 10 poles can be adopted.
In the rotor magnet of the present embodiment, it is the structure at surface configuration ferrite sintered magnet.Its reason is, when formation makes the face relative with stator all by the surface magnet that magnet is formed, problem can be become because configuring the harmonic wave caused etc. from the magnetic flux of stator winding and the groove of stator core in magnet surface generation vortex flow, can significantly lower efficiency so adopt during conductive metal magnet.Therefore, about the magnet of rotor magnet of axial-gap permanent-magnet synchronous motor that can be used in the present embodiment, it is suitable that rare-earth bond (bond) magnet, ferrite (ferrite) sintered magnet, ferrite binding magnet, ferrite rubber magnet etc.
The structure of stator is then described with Fig. 3.In the stator shown in axial central portion of Fig. 3, equally spaced configure multiple stator core 31 in the circumferential with sector crosssection in the circumferential.Its shape is around this stator core 31, configure the winding drum stand 33 be made up of the insulating element such as plastics, organic material, and the surrounding being configured in this winding drum stand is wound with the stator winding 32 of conductor with the shape similar to the periphery of segment core.The material of the conductor of winding uses copper usually, but also can use the wire rod of the light specific gravities such as aluminium.Its reason is, except there is the effect such as cheap, because stator core and winding drum stand, winding configure in the circumferential dispersedly, therefore in order to keep them, adopt the structure making resin impregnated and fixing molded motor, so in order to need lightweight with the deadweight of the adhesive strength supporting core of resin and winding.Thus, can think be used in aluminium conductor on be coated with polyester (polyester) or paint (enamel) the coated aluminium conductor enamel-cover electromagnetic wire (enamel magnet wire) etc. such as amide imide (amide-imide), polyurethane (urethane) is also effective.
The stator winding 32 being wound on the surrounding of each stator core 31 has the line of winding start point and winding end, so when the quantity of the stator core shown in Fig. 1 is 12, draws 24 tag wires.Also directly 24 lead-out wire process can be pressed, but the connection handling after considering, preferably the least possible quantity.In the present embodiment, illustrating by being reeled continuously by two windings, is examples of 2 from the line of adjacent two windings extractions.Therefore, the line of extraction is finally 12.The line of drawing usually make thinner conductor be connected with the polyvinyl chloride covered electric cable 36 being configured to twisted wire and with the terminal box wiring of motor.The electromagnetic wire (magnet wire) of motor winding and the connection of polyvinyl chloride covered electric cable 36 adopt annulus 35, are the structures be connected with annulus 35 by each line by riveted joint, welding etc.Be configured to upon connection, at the coated exposed position coating insulant of this connecting portion, make the discontiguous structure of air and moisture and conductor portion.
Then use Fig. 4 (a) and Fig. 4 (b) that structure and the manufacture method thereof of stator core are described.The Fe-based amorphous metallic foil of stator core is formed.This is because the loss of Fe-based amorphous metal is low significantly compared with other magnetic materials, and magnetic permeability is high.Even if magnetic permeability is high mean use ferrite lattice such can only obtain the magnet of lower magnetic field intensity when, also can obtain higher magnetic flux density compared with other magnetic materials.Can think except the amorphous metal of iron-based, the materials such as the nanocrystalline metal of Po Mingde iron cobalt system's high-permeability alloy (Permendure), iron-based also have effect as the material that such magnetic permeability is high.Such plate of material thickness rate is thinner, and the hardness of metal self is high, so be difficult to processing, is difficult to be applied to existing motor etc.
So, this iron core can be manufactured relatively easily for the structure shown in Fig. 4 (a).Be fan-shaped iron core to obtain the cross section shown in Fig. 3, adopt following structure: make Width be that the Fe-based amorphous metallic foil of fixed width expands width gradually from the figure bottom of Fig. 4 (a), in terminal part, make cut-out width slightly form this shape restenosis.The amorphous foil that this is stacked and obtain is at random in this condition, keeps so be inserted in the winding drum stand 33 of the insulating properties for the winding that reels of the shape shown in Fig. 4 (b) thus be configured to stator core.
The relation of the stator of motor, rotor and housing is then described with Fig. 5.Housing 40 is essentially drum.Be configured to inside this cylinder, configure stator 30 and rotor 20.Stator 30 is configured in the axial central portion of housing 40, fills to fill housing 40 and the mode in the space between stator core 31, stator winding 32, winding drum stand 33 stator with housing that insulating resin becomes to be integrated.Stator 30 is kept with the adhesive strength of resin, but in order to also make stator can not depart from housing at this resin because deterioration year in year out etc. causes when slight weight minimizing, adopt following structure: step is set in the inner side of housing 40 stator is not departed from the axial direction, in addition, a part for direction of rotation arranges the grooves such as otch or projection, stator is not also rotated in a rotational direction.
Heating from winding is delivered to housing 40 via resin, carries out conducting heat and motor being cooled, so the thickness of preferred resin is not too thick.In addition, add fin (fin) structure expand area of dissipation to cool to housing 40, improving with the heat exchange of outside air is also effective method.
As described above, the axial-gap permanent-magnet synchronous motor of the present embodiment, by the Fe-based amorphous foil of low loss is used for stator core, can improve the efficiency of motor.Current, the secondary copper loss etc. that industrial induction electric chance generation secondary current causes, can only support that so most effective the IE code of the specification value that International Electrotechnical Commission (IEC) specifies is the classification of IE3.In the axial-gap permanent-magnet synchronous motor of the present embodiment, there is not the vortex flow of magnet, the motor making iron loss, copper loss all suppress lower can be designed, so the motor efficiency that IE code is more than IE4 can be realized.
Below, change a kind of form to the structure of the present embodiment to sum up.The stator core of axial-gap permanent-magnet synchronous motor is made up of Fe-based amorphous metal, this stator core use is only cut off by Fe-based amorphous metallic foil and stacked simple manufacture method is made, and has the stator core structure of the parts maintenance being kept this stator core.
In addition, the conductor forming stator winding has the inner circumferential shape with the peripheral shape similar shape of stator core, by structure bonding to stator core, stator winding and the integration of housing inner peripheral portion resin.Because be the structure with resin bonding, so stator winding, stator core are not by insulation system that electricity engages.
Rotor, with the axial two sides of the stator structural allocation relative with magnet, is configured to the bearing rotary that can keep end cap via the bearing be combined with housing.These structures covered to the end cap of the bearing at both ends by above-mentioned housing and retainer shaft as the structure of motor make that stators and rotators is totally-enclosed, the structure be not exposed in outside atmosphere.Thereby, it is possible to avoid the impact of the abrasion powder produced because of the slip of brush etc.
And then the outlet side of armature spindle is the structure that the axle of the set diameter of axle fixed according to torque as common motor is given prominence to as output shaft.In addition, be from the structure that the axial rearward end portion bearing of rotor keeps the outside of end cap outstanding in the same manner as axle with outlet side opposition side, and be configured to the fan installing air-supply at this outstanding axle.This fan-shaped adopts the radial fan shape that flows diametrically of air making to suck from axial rearward direction side, and be configured to by order to carry in the axial direction the air flowed diametrically and the fan guard arranged cover.
Shaft rear end portion as the screw of the installation portion of fan is made up of the alloy of cupric, makes its axial end become the state of no concave-convex as far as possible by mirror finish.Be configured to the central portion at fan guard, configuration keeps the brush holder of the brush of the material of carbon containing, configuration wherein can be moved in the axial direction by spring and shaft end to motor has the brush of (applying) pressing force, and its front end contacts with the alloy portion of the cupric of shaft end.
As mentioned above, according to the present embodiment, at employing axial gap electric motor, stator winding and rotor magnet, the relative area of rotor core is large, in addition, its clearance distance is little, when electrostatic capacitance between stator winding and rotor increases, even if under the situation that the shaft voltage synchronous with common-mode voltage raises, the moment that also can produce at this shaft voltage, make electric current from brush via fan guard, housing flows to earthing potential and makes shaft voltage become earthing potential, even if so the resistance to insulating properties of the oil film part of bearing portion is low, also the effect of bearing galvanic corrosion can not be there is.
Now, in axialmode motor, produce the shaft voltage of some tens of volts, even if so contact resistance is little, electric current also reliably flows through brush contact site, and therefore the contact area of brush can be less, in addition, can also reduce contact.In addition, also can form with the high still carbon brush that abrasion loss is few of resistance value.Thus, also can form without the need to exchanging, the product that industrial motor life also can be long-lived.
In addition, by being configured in the brush holder of the central portion of fan guard, brush is at the little port ons of circular velocity, so the abrasion of brush can be alleviated, in addition, can the stable contact condition of long term maintenance by the slip of copper and carbon, therefore, it is possible to realize life of product and the cost degradation of industrial use.
In addition, by by Fe-based amorphous for stator, the low lossization of iron core of electric motor part can be realized, the efficiency of motor can be improved by low lossization, and realize long service life.
As mentioned above, in the present embodiment, the shaft voltage that can realize axial-gap permanent-magnet synchronous motor reduces countermeasure, realize high efficiency and high reliability (improving the life-span), and do not make structure become complicated, adopt cheap structure, can low cost be provided and high efficiency electric rotating machine.
[embodiment 2]
With Figure 12 (a) ~ Figure 12 (d), embodiment 2 is described.Figure 12 (a) ~ Figure 12 (d) is the figure being configured in the brush in shaft rear end portion and the position relationship of brush holder of the axial-gap permanent-magnet synchronous motor representing the present embodiment.Figure 12 (a) is the enlarged drawing in the shaft rear end portion of motor, Figure 12 (b) is the figure that shaft rear end portion adds axle 25, Figure 12 (c) represents that brush and shaft rear end portion add the figure of the relation of axle 25, and Figure 12 (d) is the figure representing brush holder 27.
As shown in Figure 12 (a), be configured to the fore-end central authorities at the rearward end axle of axial-gap permanent-magnet synchronous motor, carry out axis hole processing or configuration screw, press-in or fix the shaft rear end portion shown in configuration Figure 12 (b) by screw fastening and add axle 25 in this hole portion.This shaft rear end portion adds axle 25 and is made up of the alloy containing Cu such as brass, is to have carried out to axle surface the axle that surface roughness is the mirror finish of more than 0.3.As shown in Figure 12 (c), be configured to two brushes 26 and relatively contact with 180 degree with the circumferential surface of this axle, this brush 26 is such as by structure that brush holder 27 keeps as Suo Shi Figure 12 (d).Brush holder 27 is the parts with the outer peripheral face covering brush, can keep the structure of brush diametrically slidably.Be configured to configure spring 61, the power pressing this slidably brush 26 to brush holder central part is worked, and brush 26 is pressed to axle 25 ground, above-mentioned shaft rear end portion by this spring and configures.This brush holder 27 utilizes screw 60 etc., is arranged on the structure of fan guard 1.
In the structure shown in embodiment 1, be the middle body of axle with the sliding surface of brush, so friction portion is little, abrasion are few, and in the second embodiment, make axle attenuate to a certain degree even if can think, weakening the spring force for pressing, being still easier to wear away compared with embodiment 1.But the brush holder 27 in the present embodiment adopts the structure being easily installed to fan guard, and adopt the structure only just easily can changing each brush holder 27 with screw.In addition, brush holder is made up of the metal material of conductivity, can save the trouble being connected to the parts of earthing potential by picking out the pigtail come from brush shown in embodiment 1.
[embodiment 3]
With Figure 13 (a) and Figure 13 (b), embodiment 3 is described.In the present embodiment, represent the example implementing the abrasion powder countermeasure structure of brush.Figure 13 (a) is the enlarged drawing in the shaft rear end portion of motor, and Figure 13 (b) is the figure representing brush holder.In Figure 13 (a), at the seal 63 of the inner peripheral portion configuration ring-type of brush holder, can be configured to this abrasion powder is not discharged to brush holder outside.Seal 63 also can be applied by the method changing configuration in embodiment 1.Because be make abrasion powder remain on the structure of brush sliding surface clearance portion in the inside of brush holder by the seal, so be configured to configure sufficient gap, or arrange for keeping by the region (such as hole 64 etc.) of the brush powder stored in the region of the seal encirclements such as O shape ring.Thereby, it is possible to prevent the abrasion powder of brush from entering brush sliding surface, hinder and slide and cause not contacting etc. bad.
[embodiment 4]
Figure 11 (a) ~ Figure 11 (c) represents the example axial-gap permanent-magnet synchronous motor of the present embodiment being used for industrial use.
The motor capacity of industrial use is comparatively large, and electricity usage amount is large, so its energy-saving effect is also larger.The axial-gap permanent-magnet synchronous motor of the present embodiment is described above, can realize more than the IE4 of the IE code of IEC, so its electricity usage amount minimizing effect is larger.In addition, because pump, fan etc. require slimming, so also reducing of setting area can be contributed to.Figure 11 (a) represents the industrial pump being provided with the axial-gap permanent-magnet synchronous motor 50 of slim pump 45 and the present embodiment.Figure 11 (b) represents the schematic diagram forming the axial-gap permanent-magnet synchronous motor 50 of the present embodiment and the situation of thin fan 46.In addition, as requiring slim purposes, the hoist engine of lift is had.Figure 11 (c) represents the example of hoist engine.Because need the hoist engine 47 and the axial-gap permanent-magnet synchronous motor 50 comparatively unfertile land formation that make the rope sheave (sheave) with winding cords, so be applicable to the axial-gap permanent-magnet synchronous motor using the present embodiment.
In addition, the utility model is not limited to above-described embodiment, comprises various variation.Such as, above-described embodiment describes in detail for ease of the utility model being described with understanding, and is not necessarily defined in and possesses illustrated all structures.In addition, a part for the structure of certain embodiment can be replaced into the structure of other embodiments, or in the structure of certain embodiment, add the structure of other embodiments.In addition, for a part for the structure of each embodiment, can add, delete, replace other structures.
Claims (10)
1. an axial-gap permanent-magnet synchronous motor, is characterized in that, comprising:
Two rotors rotated centered by axle;
Stator, it is configured to described axially folded by described two rotors;
Bearing;
The housing of described stator is fixed with insulating resin;
Keep described bearing and make described stator and the totally enclosed end cap of described rotor;
Be configured in the fan of the axial end portion of described end cap; With
The brush contacted with the axial end of described fan,
The axial end of described fan is made up of the alloy of cupric,
Described brush contains carbon;
At the axial end of described fan, also there is the pressing mechanism pressurizeed to described brush.
2. axial-gap permanent-magnet synchronous motor as claimed in claim 1, is characterized in that:
Described fan is projected into the outside of described end cap and the outstanding axle formed by the axle that fan installation portion is arranged on described rotor;
The axial end of described fan is the axial end of described fan installation portion.
3. axial-gap permanent-magnet synchronous motor as claimed in claim 1 or 2, is characterized in that:
Keep the brush holder of described brush to be provided with keeping slidably the groove of the pigtail as the connecting line be connected with described brush.
4. axial-gap permanent-magnet synchronous motor as claimed in claim 1 or 2, is characterized in that:
Described pressing mechanism is configured in the brush holder keeping described brush.
5. axial-gap permanent-magnet synchronous motor as claimed in claim 1, is characterized in that:
Keep the brush holder of described brush to be utilize screw to be maintained at structure in order to the fan guard protecting the object of described fan to install, described brush is connected to electric conducting state with fan guard via the pigtail as the connecting line be connected with described brush.
6. axial-gap permanent-magnet synchronous motor as claimed in claim 1, is characterized in that:
Keep the brush holder of described brush to be the structure formed as one with the fan guard in order to protect the object of described fan to install, described brush is connected to electric conducting state with fan guard via the pigtail as the connecting line be connected with described brush.
7. axial-gap permanent-magnet synchronous motor as claimed in claim 1, is characterized in that:
Keep the brush holder of described brush to be utilize screw to be maintained at structure in order to the fan guard protecting the object of described fan to install, and be made up of the metal material of conductivity, described brush and fan guard are connected to electric conducting state.
8. axial-gap permanent-magnet synchronous motor as claimed in claim 1, is characterized in that:
Keep the brush holder of described brush to be the structure formed as one with the fan guard in order to protect the object of described fan to install, and be made up of the metal material of conductivity, described brush and fan guard are connected to electric conducting state.
9. axial-gap permanent-magnet synchronous motor as claimed in claim 5, is characterized in that:
Described fan guard is connected to described housing by construction bolt;
The axle of described rotor and described housing are earthing potential.
10. axial-gap permanent-magnet synchronous motor as claimed in claim 1, is characterized in that:
Described stator comprises stator core, stator winding, winding drum stand;
Described stator core is made up of Fe-based amorphous metal.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2013179282A JP6073763B2 (en) | 2013-08-30 | 2013-08-30 | Axial gap type permanent magnet synchronous motor |
| JP2013-179282 | 2013-08-30 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204131349U true CN204131349U (en) | 2015-01-28 |
Family
ID=52387670
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420439341.4U Expired - Fee Related CN204131349U (en) | 2013-08-30 | 2014-08-05 | Axial-gap permanent-magnet synchronous motor |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP6073763B2 (en) |
| CN (1) | CN204131349U (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108604845A (en) * | 2016-05-18 | 2018-09-28 | 株式会社日立产机系统 | Axial-gap rotary electric machine |
| CN109314445A (en) * | 2016-06-07 | 2019-02-05 | 特斯拉公司 | Motor rotor discharge prevention |
| CN109669121A (en) * | 2017-10-17 | 2019-04-23 | 株洲中车时代电气股份有限公司 | A kind of track train detection system |
| CN110177946A (en) * | 2017-01-31 | 2019-08-27 | 株式会社日立产机系统 | Screw compressor |
| CN110226278A (en) * | 2017-01-25 | 2019-09-10 | 株式会社日立产机系统 | Motor and the compressor for using it |
| CN112366877A (en) * | 2019-07-26 | 2021-02-12 | 广东威灵电机制造有限公司 | Motor and electrical equipment comprising same |
| US10967702B2 (en) | 2017-09-07 | 2021-04-06 | Tesla, Inc. | Optimal source electric vehicle heat pump with extreme temperature heating capability and efficient thermal preconditioning |
| CN113937940A (en) * | 2016-04-15 | 2022-01-14 | 标立电机有限公司 | Pump motor with fixed bearing |
| US11932078B2 (en) | 2021-03-31 | 2024-03-19 | Tesla, Inc. | Electric vehicle heat pump using enhanced valve unit |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH707123A2 (en) * | 2012-10-25 | 2014-04-30 | Utilis Ag | Clamping device with a coolant channel for cooling of machining tools in lathes. |
| JP6700003B2 (en) * | 2015-07-27 | 2020-05-27 | 株式会社荏原製作所 | Vacuum pump device |
| CN110212664A (en) * | 2019-03-27 | 2019-09-06 | 曾庆维 | Adjustable economical inertia kinetic energy output system and its control method |
| CN114499015B (en) * | 2022-01-29 | 2022-10-28 | 烟台东德实业有限公司 | Vortex type hydrogen circulating pump |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000102219A (en) * | 1998-09-28 | 2000-04-07 | Mitsubishi Electric Corp | Device for preventing axial current of electric motor or blower |
| JP5181827B2 (en) * | 2008-05-20 | 2013-04-10 | 日立金属株式会社 | Axial gap motor and fan device using the same |
| JP2011111098A (en) * | 2009-11-30 | 2011-06-09 | Nsk Ltd | Unit of preventing electric corrosion for wheel driving device and inner rotor type wheel driving device |
-
2013
- 2013-08-30 JP JP2013179282A patent/JP6073763B2/en not_active Expired - Fee Related
-
2014
- 2014-08-05 CN CN201420439341.4U patent/CN204131349U/en not_active Expired - Fee Related
Cited By (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113937940B (en) * | 2016-04-15 | 2024-03-15 | 标立电机有限公司 | Pump motor with fixed bearing |
| CN113937940A (en) * | 2016-04-15 | 2022-01-14 | 标立电机有限公司 | Pump motor with fixed bearing |
| CN108604845B (en) * | 2016-05-18 | 2020-06-16 | 株式会社日立产机系统 | Axial gap type rotating electric machine |
| CN108604845A (en) * | 2016-05-18 | 2018-09-28 | 株式会社日立产机系统 | Axial-gap rotary electric machine |
| US10992203B2 (en) | 2016-05-18 | 2021-04-27 | Hitachi Industrial Equipment Systems Co., Ltd. | Axial gap type rotary electric machine |
| US11218045B2 (en) | 2016-06-07 | 2022-01-04 | Tesla, Inc. | Electric motor waste heat mode to heat battery |
| KR102222407B1 (en) * | 2016-06-07 | 2021-03-03 | 테슬라, 인크. | Electric motor rotor discharge protection |
| US11088582B2 (en) | 2016-06-07 | 2021-08-10 | Tesla, Inc. | Electric motor rotor discharge protection |
| KR20190016549A (en) * | 2016-06-07 | 2019-02-18 | 테슬라, 인크. | Electric motor rotor discharge protection |
| US11757320B2 (en) | 2016-06-07 | 2023-09-12 | Tesla, Inc. | Electric motor rotor discharge protection |
| CN109314445A (en) * | 2016-06-07 | 2019-02-05 | 特斯拉公司 | Motor rotor discharge prevention |
| CN110226278A (en) * | 2017-01-25 | 2019-09-10 | 株式会社日立产机系统 | Motor and the compressor for using it |
| CN110177946A (en) * | 2017-01-31 | 2019-08-27 | 株式会社日立产机系统 | Screw compressor |
| US11469643B2 (en) | 2017-01-31 | 2022-10-11 | Hitachi Industrial Equipment Systems Co., Ltd. | Scroll compressor having axial fan and discharge brush |
| US10967702B2 (en) | 2017-09-07 | 2021-04-06 | Tesla, Inc. | Optimal source electric vehicle heat pump with extreme temperature heating capability and efficient thermal preconditioning |
| CN109669121A (en) * | 2017-10-17 | 2019-04-23 | 株洲中车时代电气股份有限公司 | A kind of track train detection system |
| CN112366877A (en) * | 2019-07-26 | 2021-02-12 | 广东威灵电机制造有限公司 | Motor and electrical equipment comprising same |
| US11932078B2 (en) | 2021-03-31 | 2024-03-19 | Tesla, Inc. | Electric vehicle heat pump using enhanced valve unit |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2015050798A (en) | 2015-03-16 |
| JP6073763B2 (en) | 2017-02-01 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN204131349U (en) | Axial-gap permanent-magnet synchronous motor | |
| US20140339831A1 (en) | Dynamoelectric device | |
| CN103683699A (en) | Method for producing salient pole rotor generator | |
| CN202957727U (en) | Axial type permanent magnet synchronous motor | |
| CN102377300A (en) | Double-stator single-rotor rare earth permanent magnet motor | |
| CN201869064U (en) | Double-stator single-rotor rare earth permanent magnet motor | |
| CN103618415A (en) | Production method of claw pole excitation generator with brush | |
| CN205489969U (en) | Miniature no iron core generator | |
| CN203027089U (en) | High-voltage and low-voltage fit double-commutator direct current permanent magnet motor | |
| CN104505961B (en) | A kind of outer rotor dynamotor | |
| CN201191799Y (en) | Permanent magnetic overlapped efficient power generator | |
| CN200987085Y (en) | High speed permanent-magnetic motor generator | |
| CN109474087A (en) | A kind of monopolar machine | |
| CN206820567U (en) | A kind of automobile generator rotor assembly | |
| CN216312768U (en) | Double concentrated winding generator | |
| CN214314773U (en) | Motor rotor assembly | |
| CN215071828U (en) | Concentrated winding generator | |
| CN201733147U (en) | Limited angle torque motor | |
| CN112928832A (en) | Double-concentrated winding generator | |
| CN105871118A (en) | Warm wind and power generation integral machine of tricycle | |
| CN208337377U (en) | A kind of high-intensitive permanent magnet synchronous motor remanufactured | |
| CN201887625U (en) | Coreless permanent magnet motor | |
| CN101247071A (en) | Novel DC motor | |
| CN104578604A (en) | Brushless motor and manufacturing method thereof | |
| CN100426636C (en) | A flat rare-earth permanent-magnetic brushless DC machine |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150128 Termination date: 20210805 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |