CN101651393A - Asynchronous motor, in particular driving motor of refrigerant compressor - Google Patents

Asynchronous motor, in particular driving motor of refrigerant compressor Download PDF

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Publication number
CN101651393A
CN101651393A CN200910167016A CN200910167016A CN101651393A CN 101651393 A CN101651393 A CN 101651393A CN 200910167016 A CN200910167016 A CN 200910167016A CN 200910167016 A CN200910167016 A CN 200910167016A CN 101651393 A CN101651393 A CN 101651393A
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China
Prior art keywords
extension
motor
rotor core
centre bore
rotor
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Granted
Application number
CN200910167016A
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Chinese (zh)
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CN101651393B (en
Inventor
N·C·韦劳克
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Danforth home compressors Ltd
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Danfoss Compressors GmbH
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K17/00—Asynchronous induction motors; Asynchronous induction generators
    • H02K17/02—Asynchronous induction motors
    • H02K17/16—Asynchronous induction motors having rotors with internally short-circuited windings, e.g. cage rotors
    • H02K17/20—Asynchronous induction motors having rotors with internally short-circuited windings, e.g. cage rotors having deep-bar rotors

Abstract

The invention relates to an asynchronous motor, in particular a driving motor of refrigerant compressor. The asynchronous motor has a stator and a rotor (3) provided with a rotor core (7) with a central hole, a shaft which is guided through the central hole and connected with the rotor core in a torque-proof manner, and a slit, in which electrical conductors (14, 15) are arranged, the electrical conductors are connected with one another at two sides of the rotor core (7) by short circuit rings (12, 13). For the realization of good efficiency, the short circuit ring (12) has an extending part (24) which is distributed in the whole circumferential direction, and radially and inwards guided into the central hole (18).

Description

The drive motor of asynchronous motor, particularly coolant compressor
Technical field
The present invention relates to asynchronous motor, the drive motor of coolant compressor particularly, it has stator and rotor, and this rotor has: rotor core, it has centre bore; Axle, this axle is guided through centre bore and is connected to this rotor core un-rotatably; And slit, in this slit, being furnished with electric conductor, these electric conductors are joined to one another electric conductor by the both sides of short-circuited conducting sleeve at this rotor core.
Background technology
For example can from DE 692 06 626 T2, learn a kind of rotor that is used for this motor.This rotor comprises the hole with ladder internal diameter.During operation, when the stator of this motor is created on the rotating magnetic field of extending on the circumference of this rotor, can induce electric current in the electric conductor in being arranged in the slit of this rotor, described electric current can generate magnetic field, and this magnetic field causes acting on this epitrochanterian actuating force with the rotating magnetic field of stator.
US 2007/0069601 A1 has described the another kind of rotor that is used for motor, and short-circuited conducting sleeve has a kind of like this cross sectional shape in this rotor, and promptly the radially outer profile of this short-circuited conducting sleeve is crooked.This has improved efficient and has improved motor output.
DE 602 18 217 T2 have described a kind of method that is used to make this rotor.Electric conductor in the slit is to make like this: rotor core is inserted in the mould, with stopper the hole is sealed, can inject liquid aluminium from the front side so that form this electric conductor then.
US 3,783, and 317 show a kind of rotor that is used for generator, and short-circuited conducting sleeve has the tip that axially reaches in the rotor core in this rotor, so that this short-circuited conducting sleeve is fixed to this rotor core better.But, these tips are for the in fact almost not influence of electricity output of motor.
Summary of the invention
The present invention is based on such task,, provides the asynchronous motor with good efficiencies that is.
Asynchronous motor in adopting as introducing mentioned, this task is solved, and wherein short-circuited conducting sleeve has extension, and this extension spreads all over the whole circumference direction, and radially and is upcountry guided and enter in the centre bore.
This embodiment makes the efficient increase can reach 0.3%.Reason about this point is that electric current has bigger available cross-sectional area of conductor so that arrive another electric conductor from an electric conductor now.Especially, this is applied in electric current from half side another the half side situation that flows to this rotor of of rotor.In this case, the shortest electrical distance will be favourable electrical distance.Yet this shortest electrical distance is will advance to pass the centre bore that no conductor can be used.Now,, will reduce the resistance in this part current path so, and thereby also reduce the all-in resistance of this rotor if the extension of short-circuited conducting sleeve provides extra cross-sectional area of conductor in the hole.Can suppose that at first the resistance of rotor is low more, the efficient of motor is good more.
Preferably, centre bore has the section of a plurality of different-diameters, and extension extends in having the section of maximum gauge at least.Preferably, extension also extends in the section with smaller a little diameter.In any case,, just where extension is arranged in where to the cross-sectional area of conductor of increase and the demand maximum of the conductor length that reduces.Otherwise in the zone of the maximum gauge of centre bore, it is available having only around the approach in this hole, and it is longer relatively.The extension that extends to the short-circuited conducting sleeve in the hole can cause having the current path of the minimum diameter of possibility.
Particularly ought be at least in the axial direction part in hole, when extension formed the circle wall in this hole, that's how things stand.Therefore, the extension of short-circuited conducting sleeve extends radially inwardly more as far as possible.Certainly, extension also must be reserved free space in the hole, so that be that axle makes way.However, this method provides relatively short conductor path for electric current.
Preferably, extension has radially inner side, and this radially inner side continues to extend into the inboard around the rotor core in hole.This has advantage during manufacture especially.The short-circuited conducting sleeve of extension with appointment can be arranged on the rotor core, can come the hole is processed by for example boring or turning then.Like this, the step between the inboard of this extension and this rotor core will no longer exist.
Preferably, the extension of centre bore end disposed thereon has diameter and prolongs, and the radial thickness of extension in the zone that this diameter prolongs is greater than the radial thickness in more axially inside zone.Equally, this provides favourable cross section situation for short-circuited conducting sleeve.Avoided the current concentration on transition part, this transition part is that major part (it is disposed axially in the rotor core outside) from this short-circuited conducting sleeve is to extension (it is disposed axially in rotor core inside).
If on the circumference adjacent to rotor core, extension has at least one protuberance, and the depressed part in this protuberance and this rotor core engages, and this also is very useful so.This provides between extension and rotor core and has rotated protection, if also need the hole is further handled after the manufacturing of extension, this rotation protection is exactly useful especially so.Like this, extension can be manufactured radial thickness, need not to worry that this extension will fracture from the remainder of this short-circuited conducting sleeve during boring or turning processing with relative thin.The protuberance that engages with the depressed part of rotor core provides enough opposings to extension with respect to the rotation of rotor core.
Preferably, axle is supported in the bearing pedestal that extends in the hole, and extension centers on this bearing pedestal at least on the section axial length of this bearing pedestal.When being used in this asynchronous motor in the coolant compressor, this support has advantage.In coolant compressor, the bent axle of this formation compressor that is to say, it moves back and forth piston via crank-pin and connecting rod in cylinder.Axle is supported in the bearing pedestal, and the section axial length of this bearing pedestal penetrates this rotor, be to go up apart from a certain distance of the axial centre of this rotor and when a bearing only is provided, realize a kind of simple relatively approach that this rotor can not tilt with respect to this stator when crank-pin is disposed in this.But, this bearing pedestal also has shortcoming, that is, it needs relatively large hole in rotor core.For from an electric conductor (as " inflow ") to the electric current of another electric conductor (as " backflow "), bigger hole will mean longer distance again.The extension of short-circuited conducting sleeve being arranged in the zone of bearing pedestal is a kind of ingenious mode of avoiding this problem.
Preferably, provide the gap between extension and bearing pedestal, the radially extension maximum in this gap is 1mm, is specially 0.5mm.Basically, when having a small amount of play with respect to this bearing pedestal when supporting this extension, this gap will be enough, make this extension this bearing pedestal of can not swiping.Therefore, extension forms current path or the electric conductor that is positioned on the possible minimum diameter.
Preferably, the hole has minimum diameter, and in the zone of this minimum diameter rotor core is connected to axle, and the slit in this zone has different radially inner radially extensions.In the zone of the minimum diameter in hole, rotor core has the magnetic flux path with maximum cross-section.Can this be used a kind of favourable mode, so that also provide corresponding bigger cross section for electric conductor.In order to prevent that adjacent electric conductor from contacting with each other in the zone of its radial inner end, used pivot center to have the slit of the inner of different distance.
Preferably, extension is cast on the short-circuited conducting sleeve.At first, this has simplified manufacturing.No longer need extra treatment step for making.Secondly, electrical characteristics have been improved.If extension and short-circuited conducting sleeve are integrally castings, on the transition part from the short-circuited conducting sleeve to the extension, can there be unnecessary resistance so.
Description of drawings
Below, present invention is described in conjunction with the accompanying drawings and based on preferred embodiment, wherein:
Fig. 1 is the motor of coolant compressor;
Fig. 2 is the rotor of motor;
Fig. 3 is the sectional view according to Fig. 2 III-III along the line;
Fig. 4 is the sectional view according to Fig. 2 IV-IV along the line;
Fig. 5 is the sectional view according to Fig. 2 V-V along the line; And
Fig. 6 is the sectional view according to Fig. 2 VI-VI along the line.
Embodiment
The motor 1 that is used for driving coolant compressor has stator 2 and rotor 3.Rotor 3 is non-rotatably connected to axle 4, and axle 4 radially and axially is supported in the bearing pedestal 5.Bearing pedestal 5 is parts of compressor bank 6.Bearing pedestal 5 extend into the part of its length in the rotor 3.
Rotor 3 has rotor core 7, and this rotor core 7 is made by a plurality of circular piece metallic plates 8 that pile up, equal visible shape of these a plurality of circular lamella metallic plates 8 from Fig. 3 to Fig. 6.A plurality of circular piece metallic plates 8 relative to each other are the logical and electric insulations of magnetic conductance.Equally, adopt a plurality of metal sheets that pile up 10 that stator 2 is made stator core stepped construction 9, these a plurality of metal sheets that pile up 10 relative to each other are the logical and electric insulations of magnetic conductance.Between stator 2 and rotor 3, form air gap 11.
Rotor 3 has short-circuited conducting sleeve 12,13 at two axial end portion places, and it is electrically connected to electric conductor 14,15. Electric conductor 14,15 is arranged in the slit 16,17, and slit 16,17 is formed among a plurality of circular piece metallic plate 8a-8d.For example, can make this a plurality of circular piece metallic plate 8a-8d by punching press.For example, electric conductor 14,15 and short-circuited conducting sleeve 12,13 can so be made, and the stack of sheets that is about to rotor core 7 is inserted in the mould, will wherein fill up aluminium then so that form electric conductor 14,15 and short-circuited conducting sleeve 12,13. Electric conductor 14,15 and short-circuited conducting sleeve 12,13 can be made one.
In order to take in axle 4, the rotor core 7 of rotor 3 has hole 18 center of occuping, axially extended, and there is the section of a plurality of different-diameters in this hole.In having the section 19 of minimum diameter, axle 4 is non-rotatably connected to rotor core 7.Adjacent to section 19 are the sections 20 with bigger a little diameter.Can be provided with secondary segment 21 between section 19 and 20, this secondary segment has bigger a little again diameter.Secondary segment 21 is positioned at the position at the axial end place of bearing pedestal 5.
With a side place relative with secondary segment 21 of another section 22 sections of being positioned at 20, described section 22 has enlarged diameter more, and ensuing section 23 has another and also will enlarge a little diameters.
Zone with section 22,23 of maximum gauge comprises the extension 24 of short-circuited conducting sleeve 12, and it is adjacent to compressor section 6.As from Fig. 3 and seen in fig. 4, extension 24 forms the cylinder of ring-type.Extension 24 is made into integration with short-circuited conducting sleeve 12.
As by shown in concrete among Fig. 2, on some axial region of rotor core 7, the axially-extending portion 24 of short-circuited conducting sleeve 12 forms the radially outer boundary in holes 18, in other words, forms the inwall of rotor 3.The inboard of extension 24 extends in the inboard of rotor core 7 in section 20.Therefore, there is not step.On the contrary, hole 18 is made very smooth on secondary segment 21 those sides of facing the section 19 with minimum diameter.This can cause, and extension has in section 23 the regional internal ratio with maximum gauge in the zone of the section 22 of smaller diameter and then and has bigger radially extension.When Fig. 3 and Fig. 4 are compared, can be clear that this point.Cross section in the zone of Fig. 3 section of showing 23, and the cross section in the zone of Fig. 4 section of showing 22.
Extension 24 has a plurality of, radially-protruding protuberances 25 that distribute along circumferencial direction, its with rotor core 7 in corresponding depressed part 26 joints.Therefore, the extension 24 of short-circuited conducting sleeve 12 can not rotate with respect to rotor core 7.During the manufacturing of rotor 3, this is very favourable.As mentioned above, can with electric conductor 14,15 usefulness aluminum castings in slit 16,17, can produce extension 24 simultaneously.After casting process, the part that this also can filler opening 18.Like this, hole 18 is made.This can cause part active force substantially along the circumferential direction to act on the extension 24.But, owing to extension 24 is fixed in the rotor core 7 un-rotatably with combining of depressed part 26 by protuberance 25, so extension 24 can not rotate with respect to short-circuited conducting sleeve.Therefore, stoped extension 24 to separate with short-circuited conducting sleeve 12.
Just as shown in fig. 1, the radially thickened section 27 of extension 24 that is positioned at the front side place of rotor core 7 adjacent to short-circuited conducting sleeve 12 produces the transition part of short-circuited conducting sleeve 12, and this transition part has relatively large cross section.Thus, can consider such fact, promptly must have relatively large internal diameter in close compressor section 6 parts, so that be compressor section 6 slot millings at short-circuited conducting sleeve 12.
Still as shown in fig. 1, extension 24 is centered around around the bearing pedestal 5, and has minimum gap.The radially extension in this gap is 1mm to the maximum, is preferably about 0.5mm.Basically, this gap only must prevent extension scraping bearing pedestal 5.
The extension 24 that extends axially the short-circuited conducting sleeve 12 in the rotor makes it possible to prevent the influence bearing pedestal 5 being inserted into existing unfavorable factor in the rotor 3.Since on relatively large zone to having axle 4 rotor channeling conduct, so this embodiment can have advantage mechanically.But, aspect electricity, it also has deficiency, because essential half side the flowing around bearing pedestal 5 of the electric current from a conductor 14 to another conductor 15.The extension 24 at the possible minimum diameter place that is arranged in rotor 3 is provided, can reduces to make the length of electric conductor 14,15 short-circuited conducting sleeve conductors connected to one another.This has reduced resistance, has active influence for the efficient of motor 1.
By as seen Fig. 3 to 6 is compared, the slit 16,17 in section 20,22,23 in fact almost is the same. Electric conductor 14,15 in the slit 16,17 also is the same.Only in section 20, slit 16,17 and conductor 14,15 have radially extended internally a bit a little, and this is because here the diameter in hole 18 is littler a little.
In Fig. 6, show circular piece metallic plate 8d, the diameter of its mesopore 18 is minimum, and every one, slit just extends radially inwardly, and is filled electric conductor.This provides favourable electrician's condition.

Claims (10)

1. asynchronous motor, the drive motor of coolant compressor particularly, it has stator and rotor, rotor has rotor core, axle and slit, rotor core has centre bore, axle is guided through described centre bore and is connected to described rotor core un-rotatably, be furnished with electric conductor in the slit, these electric conductors are connected to each other by short-circuited conducting sleeve on the both sides of rotor core, it is characterized in that: short-circuited conducting sleeve (12) has extension (24), described extension (24) spreads all over circumferencial direction, and is entered in the described centre bore (18) by guiding radially inwardly.
2. motor as claimed in claim 1 is characterized in that: described centre bore (18) has the section (19,20,22,23) of a plurality of different-diameters, and described extension (24) extends in having the section (23) of maximum gauge at least.
3. motor as claimed in claim 1 or 2 is characterized in that: in the axial direction part of described centre bore (18), described extension (24) forms the circle wall of this centre bore at least.
4. as each described motor in the claim 1 to 3, it is characterized in that: described extension (24) has radially inner side, and this radially inner side extends into around the inboard of the described rotor core (7) of described centre bore (18).
5. as each described motor in the claim 1 to 4, it is characterized in that: described extension (24) end disposed thereon of described centre bore (18) has diameter and prolongs, and the radial thickness of described extension (24) in the zone that described diameter prolongs is greater than its radial thickness in further axially inside zone (22)
6. as each described motor in the claim 1 to 5, it is characterized in that: on circumference adjacent to described rotor core (7), described extension (24) has at least one protuberance (25), and the depressed part (26) in described protuberance (25) and the described rotor core (7) engages.
7. as each described motor in the claim 1 to 6, it is characterized in that: described axle (4) is supported in the bearing pedestal (5), described bearing pedestal (5) extends in the described centre bore (18), and described extension (24) surrounds at least a portion axial length of described bearing pedestal (5).
8. motor as claimed in claim 7 is characterized in that: between described extension (24) and described bearing pedestal (5) gap is set, the radially extension maximum in described gap is 1mm, is specially 0.5mm.
9. as each described motor in the claim 1 to 8, it is characterized in that: described centre bore (18) has minimum diameter, in the zone of this minimum diameter, described rotor core (7) is connected to described axle (4), and the described slit in this zone (16,17) has different radially inner radially extensions.
10. as each described motor in the claim 1 to 9, it is characterized in that: described extension (24) is casted on the described short-circuited conducting sleeve (12).
CN2009101670160A 2008-08-13 2009-08-12 Asynchronous motor, in particular driving motor of refrigerant compressor Active CN101651393B (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102008038798.3A DE102008038798B4 (en) 2008-08-13 2008-08-13 Asynchronous motor, in particular refrigerant compressor drive motor
DE102008038798.3 2008-08-13

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CN101651393A true CN101651393A (en) 2010-02-17
CN101651393B CN101651393B (en) 2012-11-07

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111416487A (en) * 2020-05-13 2020-07-14 常州市臻程智能设备有限公司 All-in-one is cut to folding of shaded pole motor stator short circuit ring and inserts

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102012010638A1 (en) * 2011-06-06 2012-12-06 Secop Gmbh Rotor for motor of compressor used in refrigerator, has several plates that are connected with adjacent plate using clutch adjusting sections

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3783317A (en) 1972-11-22 1974-01-01 Wagner Electric Corp Dynamoelectric machine rotor
JPS59106866A (en) * 1982-12-10 1984-06-20 Toshiba Corp Squirrel-cage induction motor for enclosed compressor
DK157391A (en) 1991-09-06 1993-03-07 Danfoss Flensburg Gmbh ROTOR FOR AN ELECTRIC MACHINE
BRPI0106597B1 (en) * 2001-12-28 2016-03-15 Brasil Compressores Sa electric motor rotor injection process
CN1784820A (en) * 2003-05-06 2006-06-07 丹佛斯压缩机有限责任公司 A rotor for an electrical motor

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111416487A (en) * 2020-05-13 2020-07-14 常州市臻程智能设备有限公司 All-in-one is cut to folding of shaded pole motor stator short circuit ring and inserts
CN111416487B (en) * 2020-05-13 2022-10-18 常州市臻程智能设备有限公司 All-in-one is cut to folding of shaded pole motor stator short circuit ring and inserts

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Publication number Publication date
CN101651393B (en) 2012-11-07
DE102008038798B4 (en) 2021-05-06
DE102008038798A1 (en) 2010-02-25

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