CN105553142A - AC brushless dual-fed motor - Google Patents
AC brushless dual-fed motor Download PDFInfo
- Publication number
- CN105553142A CN105553142A CN201610067137.8A CN201610067137A CN105553142A CN 105553142 A CN105553142 A CN 105553142A CN 201610067137 A CN201610067137 A CN 201610067137A CN 105553142 A CN105553142 A CN 105553142A
- Authority
- CN
- China
- Prior art keywords
- rotor
- tooth
- alternating
- current brushless
- brushless double
- 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.)
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Links
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/26—Rotor cores with slots for windings
- H02K1/265—Shape, form or location of the slots
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K2213/00—Specific aspects, not otherwise provided for and not covered by codes H02K2201/00 - H02K2211/00
- H02K2213/03—Machines characterised by numerical values, ranges, mathematical expressions or similar information
Abstract
The invention discloses an AC brushless dual-fed motor. The AC brushless dual-fed motor comprises a stator and a rotor, wherein the stator is provided with p1 pole pairs and p2 pole pairs, the rotor is provided with big gears and small gears, the big gears and the small gears are radially arranged by taking the rotor as a center, the small gear is arranged between adjacent two big gears, the numbers of the big gears and the small gears are both (p1+p2), the equivalent pole pairs pr of the rotor is equal to (p1+p2), the equivalent polar distance of the rotor is Pi<r>, the sum of tooth width interval of the big gear and the tooth width interval of the small gear is Pi<r>, (p1+p2) symmetrical rotor gear grooves Z<r> are formed between the big gears and the small gears at intervals and are not uniformly arranged, and a self-closing coil is wound around each big gear. The AC brushless dual-fed motor has the advantages of structural compactness, low rotor loss, high efficiency, and running reliability.
Description
Technical field
The present invention relates to motor, relate in particular to a kind of alternating-current brushless double feedback electric engine.
Background technology
Brushless dual-feed motor adopts electric network source and variable frequency power supply to power respectively, have reliable, the variable frequency power supply capacity required is less, and can the features such as different electric pressures be adopted, can run with motor frequency change mode of speed regulation, be suitable as generator again, for wind-force or hydraulic change speed constant frequency generation etc.
The key that brushless dual-feed motor has superperformance is rotor.Wherein, rotor type can be divided into reaction equation and induction type, and concrete rotor structure mainly contains two kinds, and a kind of is the reluctance rotor belonging to reaction equation, and rotor core makes the structure of similar salient pole, without any conductor on it; Another kind belongs to induction type " concentric cage " rotor, is placed with multiple electric independent loop ring cage modle winding separately in rotor teeth groove by " nested, concentric " mode.In these two kinds of rotor structures, reluctance rotor is not because rotor has conductor, therefore rotor loss is little, efficiency is higher, but weak point to be noise and vibration larger, " concentric cage " rotor is better as motor starting characteristic, but wherein winding conductor need be isolated with insulating material and iron core,, also there are the problems such as power density is lower in complex manufacturing technology, thus also fails to enter commercial industrial practical application.
Summary of the invention
In order to overcome the deficiencies in the prior art, the object of the present invention is to provide a kind of alternating-current brushless double feedback electric engine, its compact conformation, rotor loss is little, and efficiency is high, reliable.
Object of the present invention is achieved through the following technical solutions:
A kind of alternating-current brushless double feedback electric engine, comprises stators and rotators, and stator has and is respectively p
1and p
2number of pole-pairs, rotor has canine tooth and little tooth, canine tooth and little tooth all centered by rotor in divergent shape distribution, little tooth is between adjacent two canine tooths, and the quantity of canine tooth and little tooth is p
1+ p
2individual, this rotor equivalent number of pole-pairs p
r=p
1+ p
2, rotor equivalent pole span is τ
r, canine tooth facewidth interval and the interval sum of the little tooth facewidth are τ
r, the symmetrical and 2 (p of non-uniform Distribution of gap-forming between canine tooth and little tooth
1+ p
2) individual rotor teeth groove Z
r, respectively around the coil having a self-closing on each canine tooth.
Preferably, rotor teeth groove Z
rfor even number.
Preferably, coil spread y
r< τ
r.
Preferably, canine tooth has opening dead slot.
Preferably, in opening dead slot, there is cavity, and opening dead slot extends along the axis of rotor.
Preferably, opening dead slot is multiple, distributes in the appearance of rotor.
Preferably, the both sides of opening dead slot have the narrow groove extended along rotor axial.
Preferably, coil is single turn, and by nonisulated mode winding on the rotor core of rotor; The electric conductor be inserted on rotor core adopts conducting metal casting to form, or this electric conductor is copper sliver, and is welded in rotor core.
Compared with prior art, the present invention has following beneficial effect:
The present invention can be single turn due to self-closing coil, and without the need to insulating between rotor core, the mode of casting or the welding of copper sliver thus can be adopted to make.The each canine tooth of rotor there is in addition an opening dead slot, possess cavity, wherein do not place conductor, make to present non-uniform Distribution along rotor circumference air gap, this rotor has the feature of reluctance type and winding type concurrently, and structure is simple, reliable, in addition, by the adjustment to opening dead slot size, the size of magnetic resistance or winding these two aspects effect contribution degree can be changed, make it rotor overall performance and reach a balance preferably, and then reduction rotor loss, improve efficiency.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of slot ripples induction coil of the present invention;
Fig. 2 a is Z of the present invention
r=p
r=4 slot ripples windings arrange one of schematic diagram;
Fig. 2 b is Z of the present invention
r=p
r=4 slot ripples windings arrange schematic diagram two;
Fig. 3 is slot ripples magnetic resistance of the present invention and return rings rotor mixed structure schematic diagram;
Fig. 4 is 2/6 pole slot ripples rotor punching figure of the embodiment of the present invention 1;
Fig. 5 is 2/6 pole slot ripples rotor structure schematic diagram of the embodiment of the present invention 1;
Fig. 6 is 4/8 pole slot ripples rotor punching figure of the embodiment of the present invention 2;
Fig. 7 is 4/8 pole slot ripples rotor structure schematic diagram of the embodiment of the present invention 2;
In figure: 1, stator; 2, rotor; 21, canine tooth; 22, little tooth; 23, coil; 24, opening dead slot; 25, narrow groove; 26, rotor core; 27, electric conductor.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
A kind of alternating-current brushless double feedback electric engine as shown in figs. 1-7, comprises stator 1 and rotor 2, and stator 1 has and is respectively p
1and p
2number of pole-pairs, rotor 2 has canine tooth 21 and little tooth 22, canine tooth 21 and little tooth 22 all centered by rotor 2 in divergent shape distribution, little tooth 22 is between adjacent two canine tooths 21, and the quantity of canine tooth 21 and little tooth 22 is p
1+ p
2individual, the equivalent number of pole-pairs p of this rotor 2
r=p
1+ p
2, the equivalent pole span of rotor 2 is τ
r, canine tooth 21 facewidth interval and the interval sum of little tooth 22 facewidth are τ
r, the symmetrical and 2 (p of non-uniform Distribution of gap-forming between canine tooth 21 and little tooth 22
1+ p
2) individual rotor teeth groove Z
r, respectively around the coil 23 having a self-closing on each canine tooth 21.
Wherein, the rotor teeth groove Z described in this example
rfor even number.Coil 23 span y
r< τ
r.Canine tooth 21 has opening dead slot 24.In opening dead slot 24, there is cavity, and opening dead slot 24 extends along the axis of rotor 2.The opening dead slot 24 of this example is multiple, distributes in the appearance of rotor 2.The both sides of opening dead slot 24 have along the axially extended narrow groove 25 of rotor 2.The coil 23 of this example is single turn, and by nonisulated mode winding on the rotor core 26 of rotor 2; The electric conductor 27 be inserted on rotor core 26 adopts conducting metal to cast and forms, or this electric conductor 27 is copper sliver, and is welded in rotor core 26.
The operation principle of this alternating-current brushless double feedback electric engine is as follows: the quantity forming induction coil 23 required for slot ripples winding is relevant with two kinds of numbers of pole-pairs that brushless double-fed machine stator 1 has.If brushless double-fed machine stator 1 has two kinds of numbers of pole-pairs be respectively p
1and p
2, both sums are the equivalent number of pole-pairs of rotor 2 correspondence:
p
r＝p
1+p
2，
Then, the rotor teeth groove number formed required for slot ripples winding is:
Z
r＝p
r＝p
1+p
2，
Because induction coil 23 embeds at each rotor teeth groove, therefore Z
ralso be the number of induction coil 23.If Z
r=p
rbe not even number, then the air-gap field after two kinds of number of poles synthesis will be asymmetric.
Rotor 2 winding be made up of this induction coil 23, as brushless double-fed machine stator 1p
1or p
2winding incoming transport power supply produce air-gap rotating magnetic field time, institute respond to produce rotor 2 magnetomotive force in, remove contain number of pole-pairs p
1and p
2outside these two kinds of primary harmonics, also has a series of high order harmonic component.No matter can prove, be primary harmonic or high order harmonic component, all only with rotor 2 tooth number Z
rrelevant, these harmonic wave numbers of pole-pairs meet relational expression p
ν=kZ
r± p
1(k=0,1,2,3 ...), be thus called as slot ripples.
Altogether containing Z in slot ripples rotor 2 winding
rthe induction coil 23 of individual self-closing, so can think that each coil 23 has a phase of one's own, is also the number of phases m of slot ripples rotor 2 winding
r=Z
r=p
r.Obviously, any and Z can not be contained in the slot ripples rotor 2 winding mmf harmonics formed like this
rirrelevant harmonic wave, the whole harmonic waves produced are slot ripples.If assuming that p
1< p
2, then in these slot ripples, minimum number of pole-pairs is p
1, be also p
νset in there will not be number of poles to be less than p
1low order slot ripples.
The slot ripples magnetomotive force that this slot ripples rotor 2 winding produces has following two natural qualities:
1) adjacent two slot ripples magnetomotive force direction of rotation are contrary;
2) the magnetomotive winding coefficient of all slot ripples is equal.
This alternating-current brushless double feedback electric engine stator 1 has p simultaneously
1and p
2two kinds of numbers of pole-pairs, also require that rotor 2 winding can produce number of pole-pairs p simultaneously
1and p
2and the magnetomotive force ripple that direction of rotation is contrary, and for two kinds of number of pole-pairs p
1and p
2have winding coefficient high as far as possible, and these requirements are just in time consistent with the natural quality of slot ripples rotor 2 winding, therefore rotor 2 winding of this alternating-current brushless double feedback electric engine can utilize above-mentioned slot ripples magnetomotive force natural quality to design.
If above-mentioned slot ripples winding often only has 1 closed coil 23 mutually, in each rotor teeth groove, there are two coil sides.At this moment corresponding equivalent rotor 2 pole span is τ
r=Z
r/ p
r, coil 23 pitch (span) is then y
r=τ
r, because of but whole apart from winding, the now symmetrical and p of non-uniform Distribution of gap-forming between canine tooth 21 and little tooth 22
1+ p
2individual rotor teeth groove Z
r.
Slot ripples is whole equal apart from all slot ripples winding coefficients in winding magnetomotive force.Therefore, relative to number of pole-pairs p
1and p
2outside basic slot ripples required for these two kinds, all the other high order slot ripples relative magnitude are also comparatively large, and this can have a strong impact on brushless dual-feed motor performance.Generally always wish under the prerequisite retaining basic slot ripples, weaken the high order slot ripples that these are harmful as far as possible.Change coil 23 pitch and make y
r< τ
r, also namely adopt slot ripples short distance winding to be weaken high order slot ripples effective method.Under many circumstances, slot ripples short distance winding is adopted may to obtain better performance.But after induction coil 23 pitch changes, rotor teeth groove number also must correspondingly double, the coil side after changing can settle pitch, rotor 2 winding is at this moment also corresponding becomes single layer winding.
Fig. 2 a, Fig. 2 b are depicted as p
1=1, p
2=3, Z
r=p
r=p
1+ p
2=4, τ
r=Z
r/ p
r=1 slot ripples winding arranges schematic diagram.Wherein Fig. 2 a is coil 23 pitch y
r=τ
rslot ripples whole apart from winding; Fig. 2 b is coil 23 pitch
slot ripples short distance winding, due to
for placing short-chorded coil 23,4 rotor teeth groove must be increased on coil side rotor 2 relevant position, thus form size tooth 22 structure of 8 groove non-uniform Distribution, at this moment only have a coil side in each rotor teeth groove, also namely this slot ripples short distance winding is single layer winding.
Above-mentioned slot ripples is whole lists in table 1 apart from winding and short distance winding mmf harmonics analysis result.F in table 1
νrepresent magnetomotive force relative magnitude, and F
ν+represent and rotate forward ripple F
ν-represent reversion ripple.
Table 1
P
r=p
1+ p
2=4 slot ripples winding mmf harmonics are analyzed
As can be seen from Table 1, suitably adjustment coil 23 pitch can significantly weaken high order slot ripples.When coil 23 is
short distance, relative to number of pole-pairs p in slot ripples short distance winding and whole distance winding
ν=1 and p
ν=3 these two first-harmonics, the number of pole-pairs p that amplitude is larger
νthe high order harmonic component relative magnitude of=5, reduces to 29.9320 from 60.0000, number of pole-pairs p
ν=7 relative magnitude reduce to 21.4966 from 42.8571.This also can regard as and double apart from winding because short distance winding slot-number ratio is whole, and the discrete result of high order slot ripples.
Above-mentioned canine tooth 21 circumjacent closing coil 23 number of turn can be 1 circle, so in fact defines a short-circuited conducting sleeve, and the number of whole rotor 2 short-circuited conducting sleeve is Z
r=p
r=p
1+ p
2.Because rotor 2 ferromagnetic material and conductor electric conductivity differ greatly, therefore can no longer need slot liner material, the mode that metal casting or copper sliver even can be adopted directly to weld makes short-circuited conducting sleeve, and rotor 2 structure is simplified further.
On the basis of above-mentioned analysis, to improve rotor 2 performance further, just need the magneto resistance effect utilizing rotor 2 salient pole to produce.For rotor 2 shown in Fig. 2 b, canine tooth 21 increases the opening hole slot that a width is b wherein, make the air gap at opening hole slot place from original δ
1be increased to δ
2, as field spider 2, present non-uniform change along rotor 2 circumference size of gaps, as shown in Figure 3.δ in Fig. 3
2need by Gas-gap Magnetic Field Resonance Wave analysis ability final decision with the concrete numerical value of open pore well width b.The principle of Gas-gap Magnetic Field Resonance Wave analysis remains and need make number of pole-pairs p
1and p
2these two kinds basic slot ripples relative magnitude are large as far as possible, and all the other high order slot ripples relative magnitude are little as far as possible.But it is noted herein that, the opening hole slot that canine tooth 21 increases can make to weaken around superincumbent coil 23 effectiveness, also air-gap field distribution and wherein harmonic content can be changed, when this rotor 2 also meaning for such mixed structure designs, need the effect considering magnetic resistance and winding these two aspects, by the adjustment of opening hole slot size, change the size of contribution degree between the two, make it rotor 2 overall performance and reach a balance preferably.
Embodiment 1
Design p
1=1 and p
2slot ripples rotor 2 organization plan of=3.
The p of this example
r=p
1+ p
2=4, adopt the structure that size tooth 22 interval is symmetrical, size tooth 22 respectively has 4, forms symmetry but 8 of non-uniform Distribution rotor teeth groove, get between size tooth 22
have 4 short-circuited conducting sleeves to be placed in rotor teeth groove around canine tooth 21.For strengthening salient pole magneto resistance effect, canine tooth 21 arranges opening dead slot 24 in addition, define the non-uniform Distribution along rotor 2 circumference air gap, the narrow groove 25 that two are not placed electric conductor 27 is also opened in addition again in rotor 2 conductor slot both sides, obtains rotor punching figure thus as shown in Figure 4.Figure 5 shows that in rotor teeth groove the rotor 2 overall structure schematic diagram after placing conductor also connects.
Embodiment 2
Design p
1=2 and p
2slot ripples rotor 2 organization plan of=4.
The p of this example
r=p
1+ p
2=m
r=6, adopt the structure that size tooth 22 interval is symmetrical, size tooth 22 respectively has 6, has symmetry but 12 of non-uniform Distribution rotor teeth groove, get between size tooth 22
have 6 short-circuited conducting sleeves to be placed in rotor teeth groove around canine tooth 21.For strengthening salient pole magneto resistance effect, canine tooth 21 arranges opening dead slot 24 in addition, define the non-uniform Distribution along rotor 2 circumference air gap, the narrow groove 25 that two are not placed electric conductor 27 is also opened in addition again in rotor 2 conductor slot both sides, obtains rotor punching figure thus as shown in Figure 6.Figure 7 shows that in rotor teeth groove the rotor 2 overall structure schematic diagram after placing conductor also connects.
Embodiments of the present invention are not limited thereto; according to foregoing of the present invention; utilize ordinary technical knowledge and the customary means of this area; do not departing under the present invention's above-mentioned basic fundamental thought prerequisite; the present invention can also make the amendment of other various ways, replacement or change, all drops within rights protection scope of the present invention.
Claims (8)
1. an alternating-current brushless double feedback electric engine, comprises stators and rotators, it is characterized in that, stator has and is respectively p
1and p
2number of pole-pairs, rotor has canine tooth and little tooth, canine tooth and little tooth all centered by rotor in divergent shape distribution, little tooth is between adjacent two canine tooths, and the quantity of canine tooth and little tooth is p
1+ p
2individual, this rotor equivalent number of pole-pairs p
r=p
1+ p
2, rotor equivalent pole span is τ
r, canine tooth facewidth interval and the interval sum of the little tooth facewidth are τ
r, the symmetrical and 2 (p of non-uniform Distribution of gap-forming between canine tooth and little tooth
1+ p
2) individual rotor teeth groove Z
r, respectively around the coil having a self-closing on each canine tooth.
2. alternating-current brushless double feedback electric engine according to claim 1, is characterized in that, rotor teeth groove Z
rfor even number.
3. alternating-current brushless double feedback electric engine according to claim 1, is characterized in that, coil spread y
r< τ
r.
4. alternating-current brushless double feedback electric engine according to claim 1, is characterized in that, canine tooth has opening dead slot.
5. alternating-current brushless double feedback electric engine according to claim 4, is characterized in that, has cavity in opening dead slot, and opening dead slot extends along the axis of rotor.
6. alternating-current brushless double feedback electric engine according to claim 5, is characterized in that, opening dead slot is multiple, distributes in the appearance of rotor.
7. alternating-current brushless double feedback electric engine according to claim 4, is characterized in that, the both sides of opening dead slot have the narrow groove extended along rotor axial.
8. the alternating-current brushless double feedback electric engine according to any one of claim 1-7, is characterized in that, coil is single turn, and by nonisulated mode winding on the rotor core of rotor; The electric conductor be inserted on rotor core adopts conducting metal casting to form, or this electric conductor is copper sliver, and is welded in rotor core.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610067137.8A CN105553142A (en) | 2016-01-29 | 2016-01-29 | AC brushless dual-fed motor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610067137.8A CN105553142A (en) | 2016-01-29 | 2016-01-29 | AC brushless dual-fed motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105553142A true CN105553142A (en) | 2016-05-04 |
Family
ID=55832139
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610067137.8A Pending CN105553142A (en) | 2016-01-29 | 2016-01-29 | AC brushless dual-fed motor |
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| Country | Link |
|---|---|
| CN (1) | CN105553142A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106487139A (en) * | 2016-10-19 | 2017-03-08 | 广东上水能源科技有限公司 | A kind of alternating-current brushless double feedback electric engine |
| CN108448818A (en) * | 2018-05-21 | 2018-08-24 | 广东上水能源科技有限公司 | A kind of brushless dual-feed motor cooling structure based on coolant liquid |
| CN108667218A (en) * | 2018-05-21 | 2018-10-16 | 广东上水能源科技有限公司 | A kind of brushless dual-feed motor based on coolant liquid is from driving cooling structure |
| CN110635721A (en) * | 2019-09-18 | 2019-12-31 | 合肥工业大学 | Soft start winding type brushless double-fed motor |
| GB2577571A (en) * | 2018-09-29 | 2020-04-01 | Univ Of Nottingham Ningbo China | Stator, rotor, and electrical machine with thermal benefits |
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| JPS59204437A (en) * | 1983-05-06 | 1984-11-19 | Hitachi Ltd | Rotor of generator |
| CN101510702A (en) * | 2009-03-27 | 2009-08-19 | 华中科技大学 | Wound rotor brushless double fed motor |
| CN103390946A (en) * | 2013-07-22 | 2013-11-13 | 江苏银河长征风力发电设备有限公司 | Brushless double-fed wind turbine generator with high power density |
| CN204681186U (en) * | 2015-05-12 | 2015-09-30 | 广东上水能源科技有限公司 | A kind of novel brushless dual-feed motor |
| CN105680653A (en) * | 2015-12-28 | 2016-06-15 | 华中科技大学 | Alternating current brushless double-fed motor and design method for tooth harmonic coil-wound rotor distributed winding therefor |
| CN205489852U (en) * | 2016-01-29 | 2016-08-17 | 广东上水能源科技有限公司 | A. C. brushless double -fed motor |
-
2016
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPS59204437A (en) * | 1983-05-06 | 1984-11-19 | Hitachi Ltd | Rotor of generator |
| CN101510702A (en) * | 2009-03-27 | 2009-08-19 | 华中科技大学 | Wound rotor brushless double fed motor |
| CN103390946A (en) * | 2013-07-22 | 2013-11-13 | 江苏银河长征风力发电设备有限公司 | Brushless double-fed wind turbine generator with high power density |
| CN204681186U (en) * | 2015-05-12 | 2015-09-30 | 广东上水能源科技有限公司 | A kind of novel brushless dual-feed motor |
| CN105680653A (en) * | 2015-12-28 | 2016-06-15 | 华中科技大学 | Alternating current brushless double-fed motor and design method for tooth harmonic coil-wound rotor distributed winding therefor |
| CN205489852U (en) * | 2016-01-29 | 2016-08-17 | 广东上水能源科技有限公司 | A. C. brushless double -fed motor |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106487139A (en) * | 2016-10-19 | 2017-03-08 | 广东上水能源科技有限公司 | A kind of alternating-current brushless double feedback electric engine |
| CN106487139B (en) * | 2016-10-19 | 2019-01-29 | 广东上水能源科技有限公司 | A kind of alternating-current brushless double feedback electric engine |
| CN108448818A (en) * | 2018-05-21 | 2018-08-24 | 广东上水能源科技有限公司 | A kind of brushless dual-feed motor cooling structure based on coolant liquid |
| CN108667218A (en) * | 2018-05-21 | 2018-10-16 | 广东上水能源科技有限公司 | A kind of brushless dual-feed motor based on coolant liquid is from driving cooling structure |
| CN108667218B (en) * | 2018-05-21 | 2024-02-20 | 广州亿智环保科技有限公司 | Brushless doubly-fed motor self-driven cooling structure based on cooling liquid |
| GB2577571A (en) * | 2018-09-29 | 2020-04-01 | Univ Of Nottingham Ningbo China | Stator, rotor, and electrical machine with thermal benefits |
| GB2577571B (en) * | 2018-09-29 | 2022-12-14 | Univ Of Nottingham Ningbo China | Stator for increasing heat dissipating capability |
| CN110635721A (en) * | 2019-09-18 | 2019-12-31 | 合肥工业大学 | Soft start winding type brushless double-fed motor |
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Application publication date: 20160504 |