CN205051548U - Brushless double -fed motor - Google Patents
Brushless double -fed motor Download PDFInfo
- Publication number
- CN205051548U CN205051548U CN201520832419.3U CN201520832419U CN205051548U CN 205051548 U CN205051548 U CN 205051548U CN 201520832419 U CN201520832419 U CN 201520832419U CN 205051548 U CN205051548 U CN 205051548U
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- Prior art keywords
- magnetic field
- permanent magnet
- winding
- stator
- pole
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Abstract
The utility model belongs to the technical field of the motor, in particular to brushless double -fed motor, it includes stator core, stator core includes stator slot and iron core yoke portion, inside first magnetic field and the second magnetic field that has the number of pole -pairs difference of this motor during operation, first magnetic field is the AC magnetic field, and this AC magnetic field is produced by the operating winding around on the stator slot, and this operating winding meets frequency conversion alternating current power supply, second magnetic field is the D. C. Magnetic field, and this D. C. Magnetic field is produced by an even number permanent magnet of placing in iron core yoke portion, and every permanent magnet magnetizes along stator core circumference tangential direction, the adjacent permanent magnet opposite direction that magnetizes. The during operation operating winding inserts frequency conversion alternating current power supply, changes alternating current power supply's frequency, can change the rotational speed of motor. This motor stator winding simple structure only needs to insert a frequency conversion alternating current power supply, but still has brushless double -fed motor's advantage.
Description
Technical field
The utility model belongs to technical field of motors, particularly a kind of brushless dual-feed motor.
Background technology
Alternating-current brushless double feedback electric engine is applicable to frequency conversion speed-adjusting system, and it is little etc. that its feature includes reliable and required frequency inverter capacity.This motor stator has double winding, and a set of be number of pole-pairs is p
1working winding, another set of be number of pole-pairs is p
2controlled winding.Working winding access electric network source, it can produce number of pole-pairs is p
1rotating magnetic field, controlled winding also accesses electric network source, and can produce number of pole-pairs is p
2rotating magnetic field, as at this moment controlled winding access variable frequency power supply, change the frequency of variable frequency power supply, just can change motor speed.Alternating-current brushless double feedback electric engine also can, as generator operation, need to accomplish that variable speed constant frequency exports the occasion of electric energy for wind-force or hydroelectric power generation etc.
Some problems existed in the above-mentioned operation principle of brushless dual-feed motor and engineer applied are just described in " electrotechnics magazine " the 1st phase in 2002 " principle of brushless double feed frequency-conversion and speed-regulation motor and the application prospect in Auxiliary Machinery of Power Plant a drags " literary composition.Due to existing brushless double-fed machine stator being furnished with double winding, access two kinds of AC power, winding construction on stator is made to become complicated like this, the effective rate of utilization of electromagnetic material is low compared with conventional motor, although the technical measures such as such as single-winding pole-changing also can be utilized to make a set of winding have two kinds of numbers of poles concurrently, but applicable situation is limited, generally also seldom apply.
Utility model content
For the defect existed in prior art, the utility model provides a kind of brushless dual-feed motor, and its stator structure is simple, and only need access a kind of AC power during work, but still has the feature and benefit of brushless dual-feed motor.
The Working winding of common brushless dual-feed motor gets access to grid power supply, and controlled winding connects frequency converter.When as motor running, frequency converter output frequency is regulated to change motor speed; When as generator operation, when prime mover rotating speed of drawing generator changes, regulate frequency converter output frequency that alternator output frequency can be kept constant.The relational expression of brushless dual-feed motor rotating speed n and ac power frequency is
visible, the rotating speed n of common brushless dual-feed motor and Working winding power frequency f
1, the number of pole-pairs p in magnetic field that produces of Working winding
1, controlled winding power frequency f
2and the number of pole-pairs p in the magnetic field of controlled winding generation
2closely related.Inventor notices: if controlled winding power frequency f
2=0, when also namely accessing invariable DC power supply, at this moment number of pole-pairs is p
2controlled winding will produce the constant D.C. magnetic field of frequency, due to the number of pole-pairs p in the magnetic field that Working winding produces
1with the number of pole-pairs p in the magnetic field that controlled winding produces
2for changeless, so the rotating speed n of brushless dual-feed motor is by the frequency f by Working winding
1determine.At this moment, available number of pole-pairs is p
2permanent magnet replace number of pole-pairs be p
2d.C. magnetic field, makes stator only leaves Working winding, thus enormously simplify the stator winding structure of motor.At this moment to change motor speed n, Working winding access variable frequency power supply also changes frequency f
1.Still there is the different magnetic field of two kinds of numbers of pole-pairs in the motor after change, still has the advantage of brushless dual-feed motor.Rotor then still can be the same with common brushless dual-feed motor, adopts reluctance type or the winding type structure of particular design.With common brushless dual-feed motor unlike, Working winding must adopt variable frequency power supply to power.
In order to solve problems of the prior art, achieve the above object, the utility model is achieved through the following technical solutions:
A kind of brushless dual-feed motor, comprise stator core, stator core comprises stator slot and iron core yoke part, and inner during this machine operation exist the first different magnetic field of number of pole-pairs and the second magnetic field.First magnetic field is AC magnetic field, and this AC magnetic field produces by around the Working winding on stator slot, and this Working winding connects variable frequency alternating current power source; Second magnetic field is D.C. magnetic field, and this D.C. magnetic field is produced by the even number permanent magnet being positioned over iron core yoke part, and each permanent magnet magnetizes along stator core circumference tangential direction, and the magnetizing direction of adjacent permanent magnet is contrary.
Compared with prior art, the beneficial effects of the utility model are: the utility model, by placing permanent magnet on brushless double-fed machine stator, makes existing brushless dual-feed motor stator winding structure be simplified.This motor make use of the operation principle of brushless dual-feed motor, the same with common brushless dual-feed motor, during work, stator has the magnetic field of two kinds of different numbers of pole-pairs, but the number of pole-pairs in the magnetic field of this motor generation is p
2controlled winding substitute with the permanent magnet with same pole logarithm, a just only surplus a set of Working winding on such stator, thus simplify stator winding structure.During work, Working winding access variable frequency alternating current power source, changes the frequency of AC power, can change the rotating speed of motor.Meanwhile, because stator still has the different magnetic field of two kinds of numbers of pole-pairs, therefore this motor still has the advantages such as reliable, required frequency inverter capacity is little.
Accompanying drawing explanation
Accompanying drawing is used to provide further understanding of the present utility model, is used from explanation the utility model with embodiment one of the present utility model, does not form restriction of the present utility model, in the accompanying drawings:
Fig. 1 is stator core construction schematic diagram;
Fig. 2 is number of stator slots is 24, the slot-number phase graph when number of pole-pairs of Working winding is 4;
Fig. 3 is the groove PHASE DISTRIBUTION figure of Working winding;
Fig. 4 is the winding diagram of Working winding.
Reference numeral comprises:
111---stator core;
112---iron core yoke part;
113---stator slot;
114---permanent magnet;
115---iron core segmentation.
Embodiment
In order to make the purpose of this utility model, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the utility model is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the utility model, and be not used in restriction the utility model.
Brushless dual-feed motor inside of the present utility model is respectively containing D.C. magnetic field and AC magnetic field, and wherein, number of pole-pairs is p
2d.C. magnetic field produced by the permanent magnet 114 be placed in iron core yoke part 112, number of pole-pairs is p
1aC magnetic field then by around on stator slot 113 Working winding encourage produce.Producing permanent magnet 114 arrangement of D.C. magnetic field is: be 2p by stator core 111 part
2section, i.e. even number section, between two iron leg core segmentations 115, place a block permanent magnet 114, be placed in iron core yoke part 112 particularly, whole iron core yoke part 112 circumferentially places 2p altogether
2individual permanent magnet 114.Permanent magnet 114 magnetizes by along stator circumference tangential direction, and adjacent two permanent magnet 114 magnetizing directions are contrary, and being formed along stator air gap circumferential polar logarithm is p
2d.C. magnetic field.After adopting this kind of structure, by magnetic field different for existence two kinds of numbers of pole-pairs when stator works, Working winding accesses variable frequency alternating current power source, can rotor turns be driven, change frequency additionally by frequency converter and can change rotor speed.
Because stator core 111 is by 2p
2individual permanent magnet 114 has been separated into 2p
2section, and Working winding be number of pole-pairs is p
1m cross streams winding, therefore for the AC magnetic field that Working winding produces, just must consider to exchange the symmetry on magnetic circuit, accomplish to exchange magnetic resistance on magnetic circuit as far as possible minimum, for avoiding, exchange flux path there is excessive magnetic resistance in addition, the direct current flux magnetic circuit that permanent magnet is produced and stator winding are produced exchange flux magnetic circuit and are closed by different paths, so just require that exchange flux is only closed by stator core 111 and do not pass permanent magnet 114.For the interchange magnetic circuit avoiding the permanent magnet 114 pairs of Working windings on stator core 111 to produce impacts, whole coils of Working winding are arranged in stator slot 113 should be as follows with connected mode:
Assuming that the number of stator slots distributed along air gap even circumferential in the utility model is Z, then in corresponding each iron core segmentation 115, contained number of stator slots is
the coil placed in this k stator slot 113, for p
1symmetrical for pole m, thus can to regard a number of pole-pairs as be p
1the sub-winding of m phase, m coil on the sub-winding of each m phase has different genus mutually, mutual deviation respectively
For the exchange flux that so sub-winding of m phase produces, magnetic circuit m is symmetrical, just in time define in one iron leg core segmentation 115 of stator core 111 closed " asterism " that the sub-winding of m phase exchanges magnetic circuit, namely the mode that star connects is adopted, at this moment exchange flux has formed self-closing loop, and the exchange flux that therefore the sub-winding of m phase produces can not pass permanent magnet 114 in iron core yoke part 112.At this moment, by the iron core segmentation 115 that permanent magnet 114 is separated, for Working winding interchange magnetic circuit generally speaking, what appreciable impact will be principle will not have.
As mentioned above, the layout of coil in stator core 111 of Working winding, must accomplish exchange flux not through permanent magnet 114, exchanges the integrated symmetric of magnetic circuit and magnetic resistance is minimum.Therefore, by the symmetrical layout of m, the electrical degree space shared by every iron leg core segmentation 115 also should namely be required, for p for the winding coil in iron leg core segmentation 115 every on stator core 111
2be 180 ° of electrical degrees to DC magnetic, for p
1be very then 360 ° of electrical degrees to AC magnetism, so just should satisfy condition: p
1=2p
2, namely the number of pole-pairs of AC magnetic field is the twice of D.C. magnetic field number of pole-pairs.Every iron leg core segmentation 115 planted agent comprises one group of sub-winding of m phase, and a permanent magnet 114 is placed at every iron leg core segmentation 115 two ends, and each permanent magnet 114 magnetizes along stator core 111 circumference tangential direction, and adjacent permanent magnet 114 magnetizing direction is contrary.
Because in each iron core segmentation 115, number of stator slots is k, also namely required stator slot adds up to Z=2p
2k.In a lot of situation, for making winding construction simple, can consider to adopt the individual layer concentratred winding electrically, the i.e. effective edge of an only embedding coil on each stator slot 113, required number of stator slots is the twice of coil, because adopt m phase power supply, so the number of stator slots in every iron leg core segmentation 115 is k=2m.Coil number total on stator is
the span y=m of each coil.
For the motor that capacity is larger, also can consider to adopt more number of stator slots, such as, number of stator slots gets aZ (a is positive integer), and at this moment every corresponding number of stator slots of iron leg core segmentation 115 is ak,
coil number total on stator is
the span y=am of each coil, whole coil forms the single layer winding of the symmetrical distribution of m.
An application example of the present utility model is provided below according to above-mentioned principle:
Have a motor of the present utility model, its Working winding number of pole-pairs is p
1=4, number of phases m=3, the permanent magnet number therefore choosing iron core yoke part 112 layout is 2p
2=p
1=4, D.C. magnetic field number of pole-pairs is p
2=2.Rotor adopts reluctance type or the winding type structure of common brushless dual-feed motor.In the present embodiment, each of 3 phase Working windings in an iron leg core segmentation 115 only around a coil, Working winding adopts individual layer concentratred winding, namely required number of stator slots is the twice of coil number, so obtaining number of stator slots required in every iron leg core segmentation 115 is here k=2m=6, simultaneously according to the relational expression of number of stator slots total on each iron core segmentation 115 number of stator slots and stator
so there is total number of stator slots Z=2p
2k=24, the total number of coil
the span y=m=3 of each coil.By upper gained, this motor needs to have 24 stator slots 113, places 4 block permanent magnets 114, iron core yoke part 112 is divided into 4 sections, comprising in every iron leg core segmentation 115 on 6 stator slots, 113,6 stator slots 113 adopts the mode of single layer winding to be wound with 3 coils, and 3 coils belong to different mutually.
Be illustrated in figure 1 this example motor stator structure schematic diagram.Z=24 is respectively, p shown in Fig. 2 and Fig. 3
1the slot-number phase graph of=4 and the 3 phase groove PHASE DISTRIBUTION figure being labeled as A, B, C.
Stator core 111 is designed to as Fig. 1 institute, and the housing of stator core 111 is quadrangle, is square particularly, so just can has larger permanent magnet 114 arrangement space, and reach D.C. magnetic field symmetry in the present embodiment; Iron core yoke part 112 is divided into 4 sections by 4 permanent magnets 114 that these foursquare 4 summits are placed, and each iron core segmentation 115 includes 6 stator slots 113.Press the number order of stator slot shown in Fig. 1 No. 113, can find out from the phase place of groove shown in Fig. 2 and Fig. 3, when 6 stator slots 113 contained in each iron core segmentation 115, corresponding number of pole-pairs p
1electrical degree be 360 °, place by number of pole-pairs p in these 6 stator slots 113
1mutual deviation 120 ° of electrical degrees and belong to 3 coils of A, B, C3 phase respectively, the 3 cross streams magnetic fluxs that 3 phase windings can be made like this to produce can not pass permanent magnet 114 on path.Figure 4 shows that the winding diagram of the Working winding of this example motor, contrast Fig. 3 can find out, at this moment stator Working winding electrically on be 60 ° of facies tract concentratred winding, get coil spread y=3, winding coefficient is 1, and conductor utilization is also 1, and utilance is higher.
Last it is noted that these are only preferred embodiment of the present utility model; be not limited to the utility model; although be described in detail the utility model with reference to embodiment; for a person skilled in the art; it still can be modified to the technical scheme described in foregoing embodiments; or equivalent replacement is carried out to wherein portion of techniques feature; but it is all within spirit of the present utility model and principle; any amendment of doing, equivalent replacement, improvement etc., all should be included within protection range of the present utility model.
Claims (5)
1. a brushless dual-feed motor, comprise stator core, stator core comprises stator slot and iron core yoke part, inner during this machine operation exist the first different magnetic field of number of pole-pairs and the second magnetic field, it is characterized in that: described first magnetic field is AC magnetic field, this AC magnetic field is produced by the Working winding around described stator slot, and this Working winding connects variable frequency alternating current power source; Described second magnetic field is D.C. magnetic field, and this D.C. magnetic field is produced by the even number permanent magnet being positioned over described iron core yoke part, and each permanent magnet magnetizes along described stator core circumference tangential direction, and adjacent permanent magnet magnetizing direction is contrary.
2. brushless dual-feed motor according to claim 1, is characterized in that: described stator core is by 2p
2individual described permanent magnet is divided into 2p
2the segmentation of iron leg core, wherein p
2for positive integer; A sub-winding of m phase is regarded as around the Working winding on the stator slot in the segmentation of every iron leg core, the sub-winding of each m phase adopts star to connect mode to connect in the segmentation of each iron leg core, the AC magnetic field that described Working winding is produced not through described permanent magnet, the wherein number of phases of AC power that connects for Working winding of m.
3. brushless dual-feed motor according to claim 2, is characterized in that: have k stator slot in the segmentation of described every iron leg core, and adopt single layer winding mode to place m coil in this k stator slot, m coil has different genus mutually, mutual deviation respectively
the span of each coil is m, wherein k=2m.
4. brushless dual-feed motor according to claim 2, is characterized in that: the shape of described stator core is regular polygon, and its limit number is 2p
2, respectively place a permanent magnet at the summit place of this regular polygon stator core, 2p
22p is placed on individual summit
2individual permanent magnet.
5. brushless dual-feed motor according to claim 1, is characterized in that: the number of described permanent magnet is 2p
2, it produces number of pole-pairs is p
2d.C. magnetic field, it is p that described Working winding produces number of pole-pairs
1aC magnetic field, the number of pole-pairs p of AC magnetic field
1for the number of pole-pairs p of D.C. magnetic field
2twice, i.e. p
1=2p
2, wherein p
1, p
2for positive integer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520832419.3U CN205051548U (en) | 2015-10-23 | 2015-10-23 | Brushless double -fed motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520832419.3U CN205051548U (en) | 2015-10-23 | 2015-10-23 | Brushless double -fed motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205051548U true CN205051548U (en) | 2016-02-24 |
Family
ID=55345090
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520832419.3U Withdrawn - After Issue CN205051548U (en) | 2015-10-23 | 2015-10-23 | Brushless double -fed motor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205051548U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105281524A (en) * | 2015-10-23 | 2016-01-27 | 易事特集团股份有限公司 | Brushless double-fed motor |
-
2015
- 2015-10-23 CN CN201520832419.3U patent/CN205051548U/en not_active Withdrawn - After Issue
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105281524A (en) * | 2015-10-23 | 2016-01-27 | 易事特集团股份有限公司 | Brushless double-fed motor |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20160224 Effective date of abandoning: 20180619 |