CN1283891A - Three-wave start method of AC motor and connection method of its windings - Google Patents
Three-wave start method of AC motor and connection method of its windings Download PDFInfo
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Abstract
A three-wave start method for AC motor features that base wave, low-order harmonic and high-order harmonic are used to start AC motor for higher start torque. The multiple link methods such as big-small stars, two tristars and combined four-star are disclosed for simple structure. Its advantages are higher start torque, no need of switching current and simple structure.
Description
The invention belongs to the starting method of alternating current motor, and the connecting method of motor stator winding.
The present inventor in 1985 first the patent of invention of application " harmonic starting method and by the motor of this method starting " successively obtained the patent of invention (China Patent No. 85102382.7, U.S. Patent number 4736147) of the China and the U.S. in 1988.Meanwhile, this novel motor begins to enter commercial Application, 11 years so far.
Over 11 years, can be divided into two stages, say from the update of product to be for two generations from the improvement of technology.First generation harmonic starting motor is the single harmonic starting, have only a harmonic wave when promptly starting and do not have first-harmonic, therefore carrying out the transition to the first-harmonic operation from harmonic starting must cut off the electricity supply and bring a lot of critical defects, as motor speed sharply descends when cutting off the power supply, and very big impulse current etc. just takes place power turn-on again.For overcoming these shortcomings, the present inventor has applied for patent of invention " the alternating current motor stator winding of biharmonic starting and speed governing " in September, 1989, proposition utilizes first-harmonic and a harmonic wave to carry out double wave to unite starting, thereby has realized transferring to from harmonic starting the conversion of not cutting off the power supply of normal operation.Make harmonic starting motor enter the second generation.The above-mentioned biharmonic starting patent inventor's patent right (patent No. is ZL89106903.8) that patents in January, 1997.
Second generation harmonic starting motor began in industrial application in 1992, practice explanation over 7 years, this biharmonic starting motor still exists following shortcoming to improve: 1) to 8 pole motors, starting torque is difficult to improve, though through repeatedly revising the winding scheme, still be difficult to break through, starting torque always is lower than 1.4 times; 2) to 4 utmost points, 6 pole motors, then owing to adopt multipole several harmonic waves (high order harmonic component) starting, rotating speed can not reach the rated speed of motor after starting, and certainly will just must be transformed into the first-harmonic starting from harmonic starting at the starting halfway, so that starting current rises to 5-7 times of rated current suddenly.At this moment, if the capacity of the supply transformer of motor is little, or the tripping current of switch is adjusted greatly inadequately in the supply line, and the tripping operation accident then often takes place.
For solving above-mentioned two problems, the present invention proposes " starting of three a ripples " new method: 6 of motor outlets, two threephase switches of tap, when entering state of starting operating when first switch is dropped into electrical network, stator winding produces three different magnetomotive force ripples of number of poles and unites and start; The direction of rotation of these three magnetomotive force ripples must be identical, the number of poles of one of them is that the work number of poles of motor is called first-harmonic, second low-order harmonic that lacks a pair of utmost point that is number of poles than first-harmonic, starting torque mainly produces by it, be called main harmonic, the 3rd high order harmonic component that is number of poles than the how a pair of utmost point or two pairs of utmost points of first-harmonic is called subharmonic; Three Bomis are cut cooperation during starting, mainly rely on the effect of major and minor harmonic wave during beginning, along with the rising first-harmonic of rotating speed also plays a role more and more biglyyer, therefore after the starting rotating speed is risen always and reach near the motor rated speed, drop into electrical network with second switch this moment, major and minor harmonic wave eliminated, and strengthened first-harmonic, carry out the transition to normal operation reposefully under the effect separately at first-harmonic, just finished the overall process of starting without any the impact of electric current.This shows that " starting of three ripples " that the present invention proposes is a fairly perfect desirable starting method.
The key that realizes above-mentioned three ripples starting is the connecting method of stator winding, and its basic demand is: when closing first switch, stator winding connects by state of starting operating, produces the magnetomotive force ripple of three required different numbers of poles of three ripples starting; And when starting second switch that close again when finishing, stator winding is changed into by operating condition connect, and eliminate aforesaid major and minor harmonic wave, motor is carried out the transition to have only the normal operation of first-harmonic.
The present invention proposes four kinds of stator winding connection methods and satisfies above-mentioned requirements, promptly big or small double star/big star connecting method, Samsung/delta connection method, 2 big 1 little Samsung/delta connection methods and compound four stars/(star-triangle) connecting method.
One, big or small double star/big star connecting method
The groove that stator winding is distributed to three-phase by regular 60 ° of facies tract windings number is coupled to two different star connection, Y connections of structure, the coil number and the coil turn of the series connection of two stars are unequal, be called big or small double star, the many star connection, Y connection of coil number that whenever is in series is called big star, uses Y
dExpression, and few one of the coil number that whenever is in series is called starlet, uses Y
sExpression.If the coil number that big or small double star whenever is in series is respectively C
dAnd c
S 'Coil turn is respectively t
dAnd t
S 'The sectional area of wire turn is respectively S
dAnd S
S 'Then should satisfy: c
dt
d=c
st
sAnd t
dS
d=t
sS
s, so that Y
dAnd Y
sEvery phase equal turn numbers, and the apparent size of two kinds of coils is identical.When concrete distributing trough number is given double star, must make Y
dAnd Y
sCorresponding two-phase is by the electromotive force same-phase of fundamental wave magnetic field induction.At this moment Y
dAnd Y
sElectromotive force must satisfy same-phase, with the condition in parallel of size, so motor when operation, can be connected to electrical network to big or small double star in parallel, they are united and produce the first-harmonic magnetomotive force.Then abandon starlet Y during starting
S 'Only big star Y
dDrop into electrical network, and by Y
dProduce the magnetomotive force ripple of three kinds of required numbers of poles of three ripples startings, distributing trough number is given Y
dShi Bixu guarantees to reach this purpose.
Size double star/big star connecting method is applicable to the threephase motor of any number of pole-pairs, no matter is integer groove winding, or fractional slot winding can both adopt.Because corresponding to two stars, every have only two parallel branches mutually.Both be applicable to low voltage motor, more be applicable to high-voltage motor.
The general winding diagram that the size double star connects as shown in Figure 1, A
d, B
d, C
dThree sections is big star Y
dThe shared groove of three-phase number, its head end U
Q, V
Q, W
QMark.A
s, B
s, C
sThree sections is starlet Y
sThe shared groove of three-phase number, its head end is marked with U, V, W.Six sections end links together and constitutes neutral point.The hollow arrow on every section next door is represented the wiring direction, and during promptly along direction of arrow wiring, positive groove number is for along connecing, and negative groove number is pressed for counter.Operating process is during starting: under U, V, 3 conditions that disconnect from electrical network of W, U
Q, V
Q, W
Q3 are dropped into electrical network, and motor just begins starting and raising speed, in the time of near rotating speed is raised to rated speed, again U, V, 3 of W is dropped into U respectively
Q, V
Q, W
Q3 electrical networks that inserted are just finished starting process.
To two layer winding, each groove number is represented a coil.Realize that from the big or small double star of above-mentioned visible employing three ripples when starting, central task are exactly six sections windings how the whole grooves of stator number being distributed to big or small double star, enumerate five embodiment below.
Embodiment 1 number of stator slots Z
1=72 8 pole motors.The maximum parallel branch of the every phase of this motor stator is counted a=8, when promptly arranging by regular 60 ° of facies tract windings, every 8 same-phases is arranged mutually, with the facies tract of size, is called " equiphase zone ", 3 grooves of each equiphase zone series connection number.Now with 6 equiphase zones of every phase totally 3 * 6=18 groove number series connection be one section as big star Y
dThree phase winding A
d, B
d, C
d, every 2 remaining mutually equiphase zones totally 3 * 2=6 groove number connect and to be one section and to constitute starlet Y
sThree phase winding A
s, B
s, C
sFor satisfying c
dt
d=c
st
sAnd t
dS
d=t
sS
sCondition, getting the every coil turn of big star is 1/3 of the every coil turn of starlet, and its circle sectional area is 3 times of starlet circle sectional area.So just determined the structural shape that big or small double star connects.
At last, 72 grooves number are distributed to 6 sections windings of said structure particularly, to guarantee as big star Y
dProduce the 6 required utmost points of three ripple methods of starting, 8 utmost points and three kinds of magnetomotive force ripples of 10 utmost points when inserting electrical network separately.Different allocative decisions will vary in size the content of three kinds of magnetomotive force ripples, therefore obtains different starting characteristics.Scheme is as example preferably to enumerate one below, and its 6 sections shared grooves of winding are number as follows:
A
d：19，20，21，37，38，39，55，56，57，-10，-11，-12，-28，-29，-30，-46，-47，
-48B
d：7，8，25，26，27，43，44，45，63，-16，-17，-18，-34，-35，-36，-52，-53，-54。
C
d：13，14，15，31，32，33，49，50，51，-4，-22，-23，-24，-40，-41，-42，-59，-60。
A
s：1，2，3，-64，-65，-66。
B
s：9，61，62，-70，-71，-72。
C
s：67，68，69，-5，-6，-58。
Get stator coil pitch y
1=8, this scheme is carried out harmonic analysis show: work as A
d, B
d, C
dThe Y that constitutes
dWhen inserting electrical network separately, the relative size of the strongest three magnetomotive force wave amplitudes of generation is: 6 utmost point main harmonics, 36.77%, 8 utmost point first-harmonic, 100%, 10 utmost point subharmonic 21.17% all is just to change ripple, satisfies the requirement of three ripples starting.This scheme is applied to a 130kW8 pole motor, calculates by electromagnetism and can try to achieve the starting current I that obtains when employing three ripples start
St=2.91 times, starting change apart from T
St=1.8 times good starting performance.
Embodiment 2 is at above-mentioned Z
1In=72 grooves 8 pole motor examples, also can adopt the structural shape of following big or small double star.Promptly change big star Y into
dEvery by 5 equiphase zones totally 3 * 5=15 groove number be in series starlet Y
sEvery by 3 equiphase zones totally 3 * 3=9 groove number be in series.The ratio of the every coil turn of correspondingly big starlet changes 3: 5 into, and the ratio of circle sectional area is 5: 3.
6 sections shared grooves of winding an of new departure of pressing said structure pattern design are number as follows:
A
d：3，19，20，21，37，38，39，-10，-11，-12，-28，-29，-30，-46，-47。
B
d：7，8，25，26，27，43，45，-16，-17，-18，-34，-35，-36，-54，-71。
C
d：13，14，15，31，32，33，50，51，67，-4，-22，-23，-24，-41，-42。
A
s：1，2，55，56，57，-48，-64，-65，-66。
B
s：9，44，61，62，63，-52，-53，-70，-72。
C
s：49，68，69，-5，-6，-40，-58，-59，-60。
Get y
1=10, can try to achieve: as big star Y
dWhen inserting electrical network separately, the amplitude of the strongest three magnetomotive force ripples of generation is: 6 utmost point main harmonics, 55.69%, 8 utmost point first-harmonic, 100%, 10 utmost point subharmonic 23.92%, being all just changes ripple, satisfies the requirement of three ripples starting.When this scheme was applied to a 380kW8 utmost point 6kV high-tension motor, the starting characteristic of acquisition was: I
St=3.26 times, T
St=1.91 times.
Embodiment 3 Z
1=84 8 pole motors.This motor is the fractional slot winding of several 84/ (3 * 8)=7/2 of every extremely every phase groove, and the maximum parallel branch number of its every phase is a=8/2=4.Therefore every have only 4 equiphase zones mutually, 7 grooves of each equiphase zone series connection number.At this moment has only a kind of big or small double star structure, promptly big star Y
dEvery 7 * 3=21 groove number series connection by 3 equiphase zones constitutes, and starlet Y
sEvery 7 grooves number series connection by 1 equiphase zone constitutes, and the ratio of the coil turn of large and small star is 1: 3, and the ratio of circle sectional area is 3: 1.
List below by 6 sections shared grooves of winding of big or small double star of a scheme of said structure pattern design number:
A
d：1，22，23，24，25，43，44，45，46，65，66，67，-12，-13，-14，-33，-34，-35，-54，-55，-56。
B
d：8，9，10，29，30，31，32，50，51，52，53，74，-19，-20，-21，-40，-41，-42，-61，-62，-63。
C
d：15，16，17，18，36，37，38，39，57，58，59，60，-5，-26，-27，-28，-47，-48，-49，-69，-70。
A
s：2，3，4，64，-75，-76，-77。
B
s：11，71，72，73，-82，-83，-84。
C
s：78，79，80，81，-6，-7，-68。
Get y
1=10, can try to achieve as big star Y
dWhen inserting electrical network separately, the amplitude that three ripples of generation start required three magnetomotive force ripples is: 6 utmost point main harmonics, 37.83%, 8 utmost point first-harmonic, 100%, 10 utmost point subharmonic 19.06%.This is on record when being applied to a 245kW8 pole motor, and the starting characteristic of acquisition is: I
St=3.11 times, T
St=1.93 times.
Embodiment 4 Z
1=72 6 pole motors.The maximum parallel branch number of the every phase of this motor is a=6, and therefore every have 6 equiphase zones mutually, 4 grooves of each equiphase zone series connection number.At this moment has only a kind of big or small double star structure, promptly big star Y
dEvery 4 * 4=16 groove number series connection by 4 equiphase zones constitutes, and starlet Y
sEvery 4 * 2=8 groove number series connection by 2 equiphase zones constitutes, and the ratio of the coil turn of large and small star is 1: 2, and the ratio of circle sectional area is 2: 1.
6 sections shared grooves of winding of big or small double star of a scheme of pressing said structure pattern design are number as follows:
A
d：25，26，27，28，49，50，51，52，-13，-14，-15，-37，-38，-39，-40，-64。
B
d：9，10，33，34，35，36，59，60，-21，-22，-23，-24，-45，-46，-47，-48。
C
d：17，18，19，20，41，42，43，44，-5，-29，-30，-31，-32，-54，-55，-56。
A
s：1，2，3，4，-16，-61，-62，-63。
B
s：11，12，57，58，-69，-70，-71，-72。
C
s：65，66，67，68，-6，-7，-8，-53。
Get y
1=11, can try to achieve as big star Y
dWhen inserting electrical network separately, the amplitude that three ripples of generation start required three magnetomotive force ripples is: 4 utmost point main harmonics, 52.77%, 6 utmost point first-harmonic, 100%, 8 utmost point subharmonic 22.21%.When this scheme was applied to a 550kW6 utmost point 6kV high-tension motor, the starting characteristic of acquisition was: I
St=3.60 times, T
St=2.08 times.
Embodiment 5 Z
1=72 4 pole motors.The maximum parallel branch number of the every phase of this motor is a=4, and therefore every have 4 equiphase zones mutually, and 6 grooves of each equiphase zone series connection number can adopt following big or small double star structure: big star Y
dEvery 6 * 3=18 groove number series connection by 3 equiphase zones constitutes, and starlet Y
sEvery 6 grooves number series connection by 1 equiphase zone constitutes, and the ratio of the coil turn of large and small star is 1: 3, and the ratio of circle sectional area is 3: 1.
6 sections shared grooves of winding of big or small double star of a scheme of pressing said structure pattern design are number as follows:
A
d：4，5，6，37，38，39，40，41，42，-19，-20，-21，-22，-23，-24，-55，-56，-57。
B
d：13，14，15，16，17，18，49，50，51，52，53，54，-31，-32，-33，-34，-35，-36，。
C
d：25，26，27，28，29，30，-7，-8，-9，-10，-11，-12，-43，-44，-45，-46，-47，-48。
A
s：1，2，3，-58，-59，-60。
B
s：-67，-68，-69，-70，-71，-72。
C
s：61，62，63，64，65，66。
Get y
1=14, can try to achieve as big star Y
dThe amplitude of the strongest three the magnetomotive force ripples that produce when inserting electrical network separately is: 2 utmost point main harmonics, 35.72%, 4 utmost point first-harmonic, 100%, 6 utmost point subharmonic 21.08%, being all just changes ripple, satisfies the requirement of three ripples starting.When this scheme was applied to a 30kW4 pole motor, the starting characteristic of acquisition was: I
St=3.83 times, T
St=1.87 times.
Two, the big or small double star/big star connecting method that is used for the special construction of 72 grooves, 4 utmost points
To 72 grooves, 4 pole motors, except adopting the above-mentioned big or small double star connecting method that is common to various numbers of poles, following a kind of unique connecting method is arranged still, its principle is as shown in Figure 2.
Fig. 2 a is 72 grooves, 4 utmost point windings, when distributing the three-phase groove by regular 60 ° of facies tract windings, and the deployment scenarios of 24 grooves of 4 equiphase zones of every phase number on 4 utmost point phase diagrams (among the figure each zero represent a groove number).Now 6 grooves of one of them equiphase zone number are divided into 2 groups: first group is second and the 5 two groove observed from left to right number, and second group is the left the first, the 3rd, the 4th and the 6th totally 4 grooves number.With 6 grooves of 2 grooves of every phase first group number and an equiphase zone number, totally 8 groove number series connection are one section winding, constitute starlet Y again
sA
s, B
s, C
sThree-phase.And with 4 grooves of every phase second group number and remaining 2 equiphase zones totally 16 grooves number to connect be one section winding, constitute big star Y
dA
d, B
d, C
dThree-phase is shown in Fig. 2 b.Half of the number of turn of the every coil of at this moment big star should be starlet person, and 2 times of its sectional area should be starlet person.
Observe Fig. 2 b as seen: respond in the electromotive force E of the corresponding two-phase of big or small double star by 4 utmost point fundamental wave magnetic fields
dAnd E
sSame-phase strictly.As for being calculated as follows on the size, establish every coil 4 circles of starlet, big every coil 2 circles of star, the electromotive force of every circle is 1V, then:
E
s=2(4cos?5°+8cos?15°+4cos?25°)=30.6748331V
E
d=2(6cos?5°+4cos?15°+6cos?25°)=30.55743643V
As seen electromotive force E
dAnd E
sOnly differ 0.3827% in size, in the engineering practical application, can think E
dAnd E
sWith size.So, E
dAnd E
sSame-phase, size, so big or small double star together can be connected to electrical network in parallel.
In addition, from the structural shape of above-mentioned big or small double star, the theoretical strict proof of available circuit: starlet Y
sThe leakage impedance of every phase and big star Y
dThe ratio of the leakage impedance of every phase is 2: 1.So, distribute with leakage impedance from electric current to be inversely proportional to as seen, when big or small double star was connected to electrical network in parallel, the electric current by starlet was 1: 2 with the ratio of electric current by big star.
The big or small double star of this special construction/big star connecting method is that 72 grooves, 4 pole motors have increased a new connecting method, is convenient to carry out scheme relatively, enumerates an embodiment below.
Embodiment 6 Z
1=72 grooves 4 pole motors, adopt 6 sections shared grooves of winding an of new departure of the big or small double star of above-mentioned special construction/big star connecting method design number as follows:
A
d：1，2，3，4，6，37，39，40，41，42，-55，-56，-57，-58，-59，-60。
B
d：16，18，49，50，51，52，53，54，-31，-33，-67，-68，-69，-70，-71，-72。
C
d：28，30，61，62，63，64，65，66，-7，-8，-9，-43，-45，-46，-47，-48。
A
s：5，38，-19，-20，-21，-22，-23，-24。
B
s：13，14，15，17，-32，-34，-35，-36。
C
s：25，26，27，29，-10，-11，-12，-44。
Get y
1=14, can try to achieve: as big star Y
dWhen inserting electrical network separately, the amplitude of the strongest three magnetomotive force ripples of generation is: 2 utmost point main harmonics, 40.94%, 4 utmost point first-harmonic, 100%, 6 utmost point subharmonic 23.79%, being all just changes ripple, satisfies the requirement of three ripples starting.The comparison of this scheme and embodiment 5, visible main harmonic amplitude improves a lot, and the subharmonic amplitude also increases.When this scheme was applied to used same the 30kW4 pole motor of embodiment 5, the starting characteristic of acquisition was: I
St=3.67 times, T
St=2.17 times, as seen its starting characteristic more than
Used superior of embodiment 5.
Three, Samsung/delta connection method
The groove that stator winding is distributed to three-phase by regular 60 ° of facies tract windings number is coupled to three star connection, Y connections, then abandon one of them star during starting and remaining two stars are changed into delta connection, and produce the magnetomotive force ripple of three kinds of required numbers of poles of three ripples starting by the latter by switching manipulation.The characteristics of this connection method are that the number of turn of all coils is all identical with structure, belong to manufacturability and well wait the element winding.
Fig. 3 is the winding diagram that this connecting method is common to various number of pole-pairs motor.Every mutually shared groove number is divided into three sections, i.e. A
1, A
2, A
3, B
1, B
2, B
3, C
1, C
2, C
3They are connected into three star: Y
1Its three-phase is A
1, B
1, C
1Y
2Its three-phase is A
3, B
2, C
2Y
3Its three-phase is A
3, B
3, C
3Samsung is connected in electrical network during operation.During starting, under the condition that U, V, three end points of W disconnect from electrical network, U
Q, V
Q, W
QThree end points drop into electrical network, at this moment A
2, A
3, B
1, B
2, C
3, C
1Six sections are connected into a triangle.
Analyze respectively with regard to 6 utmost points, 4 utmost points, three kinds of situations of 8 pole motors below.
1) Samsung of 6 pole motors/delta connection method
To 6 pole motors, a=6, every have 6 equiphase zones mutually, and can divide equally is 3 sections windings, and every section groove number series connection by 2 equiphase zones constitutes.Obviously, at this moment 3 sections windings of gained are said the condition in parallel that must meet same-phase, same size to 6 utmost point first-harmonics.So 3 star connection, Y connection Y shown in Figure 3
1, Y
2, Y
36 utmost point first-harmonics are said it all is that symmetrical three-phase connects, when they are connected in electrical network, from the every electric current that flows into Samsung mutually of electrical network must be same-phase, with size, its situation and regular 60 ° of facies tract windings just the same, this is optimal situation.
Delta connection when in the case, needing only the starting of design of Windings one-tenth produces three kinds of required numbers of poles of three ripples starting when dropping into electrical network magnetomotive force ripple just achieves the goal.Enumerate an embodiment below.
Embodiment 7 Z
1=72 grooves 6 pole motors are in the employing. and 9 sections shared grooves of winding of a scheme of the Samsung of stating/delta connection method design are number as follows:
A
1：25，26，27，28，-13，-14，-15，-16。
A
2：1，2，3，4，-61，-62，-63，-64。
A
3：49，50，51，52，-37，-38，-39，-40。
B
1：-69，-70，-71，-72，57，58，59，60。
B
2：-45，-46，-47，-48，33，34，35，36。
B
3：-21，-22，-23，-24，9，10，11，12。
C
1：-55，-56，41，42，43，44，-29，-30。
C
2：-31，-32，17，18，19，20，-5，-6。
C
3：-7，-8，65，66，67，68，-53，-54。
From Fig. 3 as seen, U only during starting
Q, V
Q, W
Q3 are inserted separately electrical networks, and the groove of three limits series connection of the delta connection that constitute this moment is number as follows:
U
Q-V
Q：A
2-B
2=1，2，3，4，-61，-62，-63，-64，45，46，47，48，-33，-34，-35，-36。
V
Q-W
Q：B
1-C
1=-69，-70，-71，-72，57，58，59，60，55，56，-41，-42，-43，-44，29，30。
W
Q-U
Q：C
3-A
3=-7，-8，65，66，67，68，-53，-54，-49，-50，-51，-52，37，38，39，40。
Get y
1=9, when the delta connection that constitutes in the time of can trying to achieve starting inserted electrical network separately, the amplitude of the strongest three magnetomotive force ripples of generation is: 4 utmost point main harmonics, 99.27%, 6 utmost point first-harmonic, 100%, 10 utmost point subharmonic 18.25% was all and just changes ripple, satisfied the requirement of three ripples starting.When this scheme was used for a 30kW6 pole motor, the starting characteristic of acquisition was: I
St=3.22 times, T
St=1.94 times.
2) Samsung of 4 pole motors/delta connection method
To 4 pole motors, a=4, promptly every have only 4 equiphase zones mutually, and can not divide equally is 3 sections windings, therefore can't constitute three same-phases, with the parallel branch of size.Every phase groove number of symmetric winding commonly used all is 3 multiple, and therefore all can divide equally is three, and three shared groove numbers of branch road are equated, again when concrete distributing trough, accomplish as far as possible three branch roads to 4 utmost point first-harmonics says very near same-phase, with big or small.
In general, the phase structure pattern of three sections windings of every phase can have nothing in common with each other.At this moment nine sections windings constitute three different star connection, Y connection Y
1, Y
2, Y
3, but each star oneself all is three symmetrical.This be because three sections windings that constitute each star three-phase to 4 utmost point first-harmonics says remain strictly with big or small and on phase place 120 ° of mutual deviations.In the case, during the asterism parallel running, each star three-phase current is symmetrical, but is out of phase, also different sizes from the every electric current that flows into asterism mutually of electrical network.This just causes that stator winding produces a lot of extra harmonic fields, and the runnability of appreciable impact motor produces noise, vibration, reduces overload capacity.
For reducing above-mentioned influence, best situation is: the groove of every phase three parallel branches number is by the electromotive force of 4 utmost point fundamental wave magnetic fields induction, strict same-phase on phase place.There are two branch roads to equate in size, have only the 3rd branch road to have less difference in size.Below with an object lesson explanation.
Embodiment 8 Z
14 pole motors of=72 grooves adopt 9 sections shared grooves of winding of a scheme of Samsung/delta connection method design number as shown in table 1.
As seen from Table 14 utmost point first-harmonics are said the strict same-phase of every phase three branch roads, the first and the 3rd branch road is with size, and second branch road is a little bit smaller a little.Concrete result of calculation: O.7654% second branch road only little than other two branch roads.This has just weakened aforesaid extra harmonic field greatly, makes motor have good runnability
From Fig. 3 as seen, U only during starting
Q, V
Q, W
Q3 are inserted electrical network separately.The groove of connecting in the Atria that constitute a this moment limit is number as follows:
U
Q-V
Q：A
2-B
2=1，3，4，6，-55，-57，-58，-60，-49，-51，-52，-54，31，33，34，36。
V
Q-W
Q：B
1-C
1=50，53，-67，-68，-69，-70，-71，-72，-26，-29，43，44，45，46，47，48。
W
Q-U
Q：C
3-A
3=-8，-11，61，62，63，64，65，66，56，59，-37，-38，-39，-40，-41，-42。
Table 1 72 grooves 4 pole motors adopt 9 sections shared grooves of winding number of 3Y/ △ connecting method
Get y
1=11, the amplitude of three magnetomotive force ripples the strongest that produce when above-listed triangle three-phase groove number can analyze starting is: 2 utmost point main harmonics, 98.81%, 4 utmost point first-harmonic, 100%, 8 utmost point subharmonic 14.09%, satisfy the requirement of three ripples starting.When this scheme was used for one 30 kW 4 pole motors, the starting characteristic of acquisition was: I
St=3.79 times, T
St=2.02 times.
3) Samsung of 8 grades of motor/delta connection method
The Samsung of 8 grades of motor/delta connection method is similar to 4 grades of motor, so the front can all be used for 8 grades of motor to the analysis of 4 grades of motor, and just concrete numeral is different, no longer repeats here.Lift an example explanation below.
8 grades of motor of embodiment 9 Z=72 adopt 3Y/ △ connecting method, copy table 1 can list 1 feasible program, and are as shown in table 2.
As seen from Table 28 grades of first-harmonics are said three branch roads of every phase same-phase strictly, the 2nd and the 3rd branch road is with size, but the size of the 1st branch road big than other two branch roads then.Concrete result of calculation shows: the size of the 1st branch road is bigger by 1.5791% than other two branch roads.This numeral is not very big, but existing suitable component, during practice, must do further analysis as the case may be.
The groove of three limits series connection of delta connection of this forecast scheme configuration is number as follows when as seen Fig. 3 starts:
U
Q-V
Q:?A
2-B
2=-1O，57，1，2，3，-64，-65，-66，52，54，-43，-44，-45，34，35，-63.
V
Q-W
Q:?B
1-C
1=8，-53，61，62，9，-70，-71，-72，-32，59，-49，-50，60，40，41，42.
W
Q-U
Q:?C
3-A
3=-58，51，67，68，69，-4，-5，-6，46，48，-37，-38，-39，-55，-56，30.
Table 2 72 grooves 8 pole motors adopt 9 sections shared grooves of winding number of 3Y/ △ connecting method
Get y
1=8, the amplitude of three magnetomotive force ripples the strongest that produce when above-listed triangle three-phase groove number can analyze starting is: 6 utmost point main harmonics, 88.81%, 8 utmost point first-harmonic, 100%, 12 utmost point subharmonic 15.55%, being all just changes ripple, satisfies the requirement of three ripples starting.When this scheme was used for one 130 kW 8 pole motors, the starting characteristic of acquisition was: I
St=3.34 times, T
St=1.83 times.
Four, 2 big 1 little Samsung/delta connection methods
The every mutually shared groove of stator winding number is connected into three first-harmonic is said same-phase, branch road with size, article three, the coil number (being the groove number) of branch road series connection has two branch roads identical, article three, branch road is then less, just constitute 2 big 1 three little stars in conjunction with three-phase, asterism is parallel to electrical network during operation, abandons little star by switching manipulation during starting and two big stars are changed into delta connection drops into electrical network, to be produced the magnetomotive force ripple of the required three kinds of numbers of poles of three ripple methods of starting by the latter.
At this moment adopt the winding diagram of Fig. 4, A among the figure
1, B
1, C
1Be starlet three-phase, A
2, B
2, C
2Be a big star three-phase, and A
3, B
3, C
3Be another big star three-phase.During starting, 3 of U, V, W disconnect from electrical network, U
Q, V
Q, W
Q3 are dropped into electrical network.Starting finishes, and again U, V, 3 of W is dropped into U respectively
Q, V
Q, W
Q3 electrical network three-phases that connect.
2 big 1 little Samsung/delta connection methods are suitable for 8 grades of motor that adopt integer groove winding, this moment is every a=8 equiphase zone mutually, can distribute to 2 big stars to six equiphase zones, the groove of 3 equiphase zones that whenever are in series number, and two remaining equiphase zones are distributed to starlet, the groove of 2 equiphase zones that whenever are in series number.Lift an example explanation below.
8 grades of motor of embodiment 10 Z=72.Adopt the groove of nine sections windings of a scheme of 2 big 1 little Samsungs/delta connection method design number to be allocated as follows:
A
1：19，20，21，-28，-29，-30。
A
2：1，2，3，-10，-11，-12，-64，-65，-66。
A
3：37，38，39，55，56，57，-46，-47，-48。
B
1：25，26，27，-16，-17，-36。
B
2：7，8，9，61，62，-18，-70，-71，-72。
B
3：43，44，45，63，-34，-35，-52，-53，-54。
C
1：13，32，33，-22，-23，-24。
C
2：14，15，67，68，69，-4，-5，-6，-58。
C
3：31，49，50，51，-40，-41，-42，-59，-60。
Nine sections windings are pressed Fig. 4 wiring, and the starlet three-phase is disconnected during starting, and the groove of three limits series connection of delta connection that remaining two big stars constitute number is:
U
Q-V
Q：A
2-B
3=1，2，3，-10，-11，-12，-64，-65，-66，-43，-44，-45，-63，34，?35，52，53，54。
V
Q-W
Q：B
2-C
3=7，8，9，61，62，-18，-70，-71，-72，-31，-49，-50，-51，40，41，42，59，60。
W
Q-U
Q：C
2-A
3=14，15，67，68，69，-4，-5，-6，-58，-37，-38，-39，-55，-56，-57，46，47，48。
Get y
1=8, carry out harmonic analysis, the major and minor harmonic wave that produces in the time of can trying to achieve starting and magnetomotive amplitude of first-harmonic are: 6 utmost point main harmonics, 88.01%, 8 utmost point first-harmonic, 100%, 12 utmost point subharmonic 13.79% is all and just changes ripple, satisfies the requirement of three ripples starting.When this scheme was used for a 130kW8 pole motor, the starting characteristic of acquisition was: I
St=3.29 times, T
St=1.71 times.
Five, compound four stars/(amount-triangle) connecting method
In 2 big 1 above-mentioned little Samsung/delta connections, constitute groove that two parallel branches of every phase 2 big stars connect and number fundamental wave magnetic field is said and to be: same-phase, with size.Therefore a part of groove in two parallel connections number can be moved on to and the joint group outside, be the groove that shifts out number series connection that a branch road is connected with left also joint group, as shown in Figure 5.A among Fig. 5
4, B
4, C
4Be the A from Fig. 4 respectively
2, A
3, B
2, B
3And C
2, C
3The groove that is shifted out number.Move like this and must follow following condition: 1. must shift out in pairs, respectively shift out a symbol from the 2nd branch road and the 3rd branch road at every turn; 2. be moved out of a pair of groove and number first-harmonic said it must is same-phase; 3. be moved out of a pair of groove and number be originally in parallel, now change series connection into, so the number of turn of the coil of each groove number representative is the original number of turn half, and the circle sectional area should be 2 times of the former person that has come.As long as meet this 3 conditions, just the winding after the theoretical strict proof of available circuit moves fundamental wave magnetic field is said still and original winding equivalence, promptly do not influence the runnability of motor.Comparison diagram 4 and Fig. 5 as seen, 3 of U, V during starting, W disconnect with electrical network, originally Fig. 4 becomes delta connection, and Fig. 5 becomes star-delta connection, wherein the three-phase of star is A
4, B
4, C
4This just constitutes compound four stars/(star-triangle) connecting method of (Y-2Y) Y/ (Y-△).
As long as meet aforementioned 3 conditions, from and joint group what shift out to groove number with shift out which groove number all without limits, can choose arbitrarily on demand.This shows that the possible different schemes that this (Y-2Y) Y/ (Y-△) connects is extremely numerous, must design several schemes during practical application more, so that therefrom preferred preferred plan.
Now develop into (Y-2Y) Y/ (Y-△) and connect, as example from the big 1 little Samsung/delta connection of 2 shown in the embodiment 10.
Embodiment 11 analyzes the groove number of every phase 2 big stars among the embodiment 10, can find at A
2, A
3In two sections, groove numbers-10 ,-11 ,-12 is said same-phase with groove number 55,56,39 pairs of 8 utmost point first-harmonics, therefore shift out A to them so long
2, A
3, and as A
4Section the groove of connecting number.In like manner can be from B
2, B
3Section shifts out groove numbers-18,7,8 and groove numbers 63 ,-62 ,-35, and to do 4 be B
4Section the groove of connecting number.And from C
2, C
3Section extensible groove numbers 14,15 ,-4 and groove numbers-69 ,-60,31 as C
4Section the groove of connecting number.So the groove that obtains 12 sections windings in series of new departure is number as follows:
A
1：19，20，21，-28，-29，-30。
A
2：1，2，3，-64，-65，-66。
A
3：37，38，57，-46，-47，-48。
A
4：39，55，56，-10，-11，-12。
B
1：25，26，27，-16，-17，-36。
B
2：9，61，62，-70，-71，-72。
B
3：43，44，45，-34，-53，-54。
B
4：7，8，63，-18，-35，-52。
C
1：13，32，33，-22，-23，-24。
C
2：67，68，69，-5，-6，-58。
C
3：49，50，51，-40，-41，-42。
C
4：14，15，31，-4，-59，-60。
The Y-△ that constitutes during starting connects as shown in Figure 6, and the groove of three limits series connection of Fig. 6 intermediate cam shape is number as follows:
U
Q-V
Q：A
2-B
3=1，2，3，-64，-65，-66，-43，-44，-45，34，53，54。，
V
Q-W
Q：B
2-C
3=9，61，62，-70，-71，-72，-49，-50，-51，40，41，42。
W
Q-U
Q：C
2-A
3=67，68，69，-5，-6，-58，-37，-38，-57，46，47，48。
Get y
1=8, the amplitude size of three magnetomotive force ripples the strongest that produced by Y-△ connection in the time of can trying to achieve starting by harmonic analysis is: 6 utmost point main harmonics, 72.90%, 8 utmost point first-harmonic, 100%, 12 utmost point subharmonic 16.89%, being all just changes ripple, satisfies the requirement of three ripples starting.This scheme is used for a 130kW8 pole motor identical with embodiment 10, and the starting characteristic of acquisition is: I
St=2.89 times, T
St=1.81 times.The gained result is much better than embodiment 10 gained persons.
Be to develop out (Y-2Y) Y/ (Y-△) to connect from 2 big 1 little Samsung/delta connections above.In fact, from 3Y/ △ connects, every every have mutually two grooves that branch road is connected number to first-harmonic say so same-phase, with big or small, all can copy said method and develop out (Y-2Y) Y/Y-△) connecting method.The 3Y/ △ of 6 pole motors is connect and since among the 3Y three branch roads of every phase to first-harmonic say strictly same-phase, with size, all can copy said method and develop into (Y-2Y) Y/ (Y-△) and connect.To the 3Y/ △ connecting method shown in embodiment 8 and the embodiment 9 and since 3Y connect every all have in mutually two branch roads to first-harmonic say strictly same-phase, with size, therefore also can copy said method and develop out (Y-2Y) Y/ (Y-△) and connect.This shows that (Y-2Y) Y/ (Y-△) connecting method can be applied in the three ripple starting motors of various numbers of pole-pairs at large.
Connection method about the rotor winding, two patents of invention that the present inventor was once authorizing: " the multistage combined method of pole-changing-rotor winding coupling " (patent No. 88106495.5), done detailed argumentation in " the stack connecting method of asynchronous motor rotor winding " (patent No. ZL89106902.X), " connect in parallel method " and " connect in series method " two kinds of diverse ways have been arranged.The harmonic wave magnetomotive force of having only a kind of number of poles when the connect in parallel method is used to start, and the connect in series rule is used to have the harmonic wave magnetomotive force more than two kinds of numbers of poles.The three ripple starting methods that the present invention proposes utilize the magnetomotive force starting of three kinds of numbers of poles (first-harmonic and two harmonic waves), so the rotor winding must be adopted the connect in series method.
Must a lot of copper rings in parallel of welding when adopting the connect in parallel method, and rotor coil is connected into several closed-loop paths when adopting the connect in series method, cancelled copper ring in parallel, manufacturing process is simplified greatly, when not only having saved copper material but also having reduced worker.
Compare with double wave (first-harmonic and a harmonic wave) starting method that current harmonic starting motor adopts from the above the three ripple starting methods and winding coupling method thereof that can sum up the present invention's proposition, following outstanding advantage arranged:
1) 8 pole motors are significantly improved starting torque, the starting torque during the double wave starting is difficult to surpass 1.4 times, then can reach 1.8-2.0 doubly during the starting of three ripples.
2) to 6 utmost points and 4 pole motors, when adopting double wave (first-harmonic and a high order harmonic component) starting, rotating speed can not reach rated speed, halfway just must switch to the first-harmonic starting, produce very big switch current, often cause the tripping operation accident, adopt the starting of three ripples, then starting back rotating speed can go directly near the rated speed, and has eliminated switch current up hill and dale.
3) the rotor winding of three ripples startings adopts the connect in series method, and used copper ring in parallel when eliminating the double wave starting is simplified rotor structure and reduced motor cost.
4) the big or small double star connecting method that proposes of the present invention makes that stator winding is every to have only two parallel branches mutually, for harmonic starting motor has been created good condition to the high-voltage motor development.
5) stator winding that proposes of the present invention such as has adopted at element coil (apparent size is identical) such as element coil or standard, is convenient to make and the big I of rule, particularly coil span Y1 need be chosen arbitrarily by design, and helps design.
Below this Figure of description is done an explanation:
Fig. 1: the interface chart that is common to various numbers of pole-pairs that big or small double star connects.
Fig. 2: the schematic diagram that 72 grooves, 4 pole motor stator winding adopt special big or small double star to connect.Fig. 2 a is 24 grooves of every phase number forms by 4 utmost point phase arrangement, and Fig. 2 b number is divided into two groups to 24 grooves for how.
Fig. 3: the winding diagram that Samsung/triangle connects.
Fig. 4: the winding diagram that 2 big 1 little Samsungs/triangle connects.
Fig. 5: the winding diagram that compound four stars/(star-triangle) connects.
Fig. 6: be that each section winding that (star-triangle) connects connects situation during starting.
Claims (10)
1, a kind of starting method of alternating current motor, it is characterized in that, stator winding connects by state of starting operating during starting, and produce three number of poles differences, but the magnetomotive force ripple that direction of rotation is identical, one of them is the first-harmonic of motor work number of poles, second low-order harmonic that lacks a pair of utmost point that is number of poles than first-harmonic, the 3rd high order harmonic component that is number of poles than the how a pair of utmost point or two pairs of utmost points of first-harmonic, this three magnetomotive force ripples associating is together and motor starting, and its rotating speed is risen near the rated speed of motor always, this moment is again by switching manipulation, stator winding is converted to by operating condition to be connect, and eliminate aforesaid height, low-order harmonic, make motor normally operation under the independent effect of first-harmonic, in order to realize above-mentioned starting method, the rotor winding of motor must adopt tandem-type connection so that when starting three magnetomotive force ripples all work.
2, a kind of method of alternating current motor stator winding connection is characterized in that, stator winding connection is become two different star connection, Y connections of structure, and the coil number and the coil turn of the series connection of two stars are unequal, are called big or small double star, use Y
dA many star of the expression series line number of turns, Y
sAn expression few star of the series line number of turns is established the coil number that big or small double star whenever is in series and is respectively c
dAnd c
s, coil turn is respectively t
dAnd t
S 'The sectional area of wire turn is respectively S
dAnd S
s, then should satisfy c
dt
d=c
st
sAnd t
dS
d=t
sS
s, so that Y
dAnd Y
sWhen every phase equal turn numbers, and the apparent size of two kinds of coils is identical, concrete distributing trough number are given double star, also must make Y
dAnd Y
sCorresponding two-phase is by the electromotive force same-phase of fundamental wave magnetic field induction, and during the motor operation, big or small double star is connected to electrical network in parallel, at this moment only produces the first-harmonic magnetomotive force, then abandons starlet Y during starting
S 'Only allow big star Y
dInsert electrical network and produce the magnetomotive force ripple of three kinds of required numbers of poles of the described three ripple methods of starting of claim 1.
3, a kind of the described big or small double star connecting method of claim 2 is used for the stator winding connection method of 72 grooves, 4 pole motors, it is characterized in that starlet Y
sEvery 6 grooves by an equiphase zone number and when arranging by fundamental phase are positioned at second and the 5 two groove observed from left to right number, and totally 8 grooves number constitute, and big star Y
dEvery 12 grooves by 2 equiphase zones number, with be positioned at 4 grooves of the first, the 3rd, the 4th and the 6th number on the phase place, totally 16 grooves number constitute, half of the number of turn of the every coil of at this moment big star should be starlet person, and 2 times of its sectional area should be starlet person, by this structural shape stator slot number is distributed to each section winding, work as Y to reach
dWhen inserting electrical network separately, produce the magnetomotive force ripple of three kinds of required numbers of poles of the described three ripple methods of starting of claim 1.
4, a kind of method of alternating current motor stator winding connection, it is characterized in that, element coil such as employing become 3 star connection, Y connections to stator winding connection, three phase windings of each star connection, Y connection are said so strictly three symmetrical to fundamental wave magnetic field, when motor moves, 3 stars are connected to electrical network in parallel, when starting, by switching manipulation, abandon one of them star connection, Y connection, and make remaining two star connection, Y connections constitute a delta connection to insert electrical network, to produce the magnetomotive force ripple of three kinds of numbers of poles that the described three ripple methods of starting of claim 1 need.This connecting method is called Samsung/delta connection method.
It is 5, a kind of that the described Samsung of claim 4/delta connection method is used for number of poles is 6t (t=1 wherein, 2,3, Deng integer) the stator winding connection method of motor, it is characterized in that, the structural shape of 3 stars is just the same, three sections windings of corresponding phase are said same-phase, big or small together to first-harmonic, therefore when moving electrical network whenever flow into three electric current same-phases of three star connection, Y connections mutually, with size, rely on groove number to distribute delta connection when rationally guaranteeing to start to produce the magnetomotive force ripple of three kinds of numbers of poles that the described three ripple methods of starting of claim 1 need.
6, a kind of the described Samsung of claim 4/delta connection method is used for the stator winding connection method of 72 grooves, 4 pole motors, it is characterized in that, the situation that three branch roads of every phase are arranged by 4 utmost point fundamental phase is: two branch road same-phases are arranged, with size, each bar branch road all comprises 6 grooves number of an equiphase zone and second when observing from left to right and the 5 two groove number, article three, branch road then comprises first, the 3rd, the the 4th and the 6th each 2 groove number, article three, branch road and other two branch road same-phases, but little by 0.7654% than other two branch roads on the size, structural shape by above-mentioned phase place, 72 grooves number are distributed to above-mentioned each section winding, produce the magnetomotive force ripple of 3 kinds of required different numbers of poles of the described three ripple methods of starting of claim 1 when guaranteeing starting.
7, a kind of the described Samsung of claim 4/delta connection method is used for the stator winding connection method of 72 grooves, 8 pole motors, it is characterized in that, the situation that three branch roads of every phase are arranged by 8 utmost point fundamental phase is: two branch road same-phases are arranged, with size, each bar branch road all comprise 2 equiphase zones 6 grooves number and about two (promptly the first and the 3rd) grooves number, article three, branch road then comprises 6 grooves number of 2 equiphase zones and 2 and is positioned at groove number in the middle of the equiphase zone, article three, branch road and other two branch road same-phases, but press the structural shape of above-mentioned phase place than big 1.5791% of other two branch roads on the size, 72 grooves number are distributed to above-mentioned each section winding, produce the magnetomotive force ripple of 3 kinds of required different numbers of poles of the described three ripple methods of starting of claim 1 when guaranteeing starting.
8, a kind of method of alternating current motor stator winding connection, it is characterized in that, stator winding connection is become 2 big 1 three little star connection, Y connections, every phase number of turn of three stars is identical, the coil number that two big stars whenever are in series is identical and more, the little star coil number that whenever is in series is then less, for making every phase number of turn identical, the coil turn of asterism is inversely proportional to its place one series line number of turns mutually, for the apparent size that makes all coils identical, wire turn sectional area and coil turn are inversely proportional to, should make three branch roads of the corresponding phase of asterism that first-harmonic is said same-phase during concrete distributing trough, with size, asterism can be connected in electrical network when therefore moving, during starting, abandon little star by switching manipulation, and two big star reconfigurations become a delta connection, during design of Windings correctly distributing trough number to reach the magnetomotive force ripple that produces the required three kinds of numbers of poles of three ripple methods of starting when above-mentioned delta connection drops into electrical network separately
9,4 kinds respectively according to claim 5,6, the stator winding that 7 and 8 described methods connect (is all pressed Samsung/delta connection, all there are two branch roads at least in its every phase three parallel branches, number number K is identical for its series connection groove, and first-harmonic is said same-phase, with size), it is characterized in that, every from same-phase, extract N in two parallel branches with size out to groove number (every branch road N groove number, N=1 wherein, 2,3. ... until than the integer of K little 1) move on to and the series connection of joint group outside is a branch road, connect with left also joint group again, so shift out and must follow following condition: the every pair of groove that shifts out number is said same-phase to first-harmonic, the coil turn of each groove that shifts out number representative subtracts half, and the circle sectional area doubles, so obtain the compound four stars connection of when operation and primary winding equivalence, promptly (Y-2Y) Y connects, and connects and become Y-△ by original delta connection during starting.
10,3 kinds of stator winding that connect according to claim 3,6,7 described methods respectively is characterized in that groove number and electromotor series are increased to original t doubly, t=2,3, integers such as 4--, correspondingly, the groove number of last each section of gained winding also is increased to t times that equals original.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB991165950A CN1140959C (en) | 1999-08-10 | 1999-08-10 | Three-wave start method of AC motor and connection method of its windings |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB991165950A CN1140959C (en) | 1999-08-10 | 1999-08-10 | Three-wave start method of AC motor and connection method of its windings |
Publications (2)
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|---|---|
| CN1283891A true CN1283891A (en) | 2001-02-14 |
| CN1140959C CN1140959C (en) | 2004-03-03 |
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ID=5279391
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|---|---|---|---|
| CNB991165950A Expired - Fee Related CN1140959C (en) | 1999-08-10 | 1999-08-10 | Three-wave start method of AC motor and connection method of its windings |
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|---|---|
| CN (1) | CN1140959C (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102468729A (en) * | 2010-11-02 | 2012-05-23 | 郭保安 | Five-pole started energy-saving wound rotor type motor |
| CN102468730A (en) * | 2010-11-02 | 2012-05-23 | 郭保安 | Four-pole started energy-saving wound rotor type motor |
| CN102801229A (en) * | 2011-05-24 | 2012-11-28 | 永济新时速电机电器有限责任公司 | Low-noise traction motor |
| CN103944332A (en) * | 2014-03-21 | 2014-07-23 | 雷勃电气（苏州）有限公司 | Three-phase asynchronous motor |
| CN104659992A (en) * | 2015-02-04 | 2015-05-27 | 华北电力大学 | 6/8/12-pole single-winding three-speed asynchronous motor stator winding mode |
| CN110086392A (en) * | 2019-04-26 | 2019-08-02 | 宁德师范学院 | The method for expanding permanent torque frequency control range is connected using Y type winding strap tap |
| CN110635721A (en) * | 2019-09-18 | 2019-12-31 | 合肥工业大学 | Soft start winding type brushless double-fed motor |
| CN112332628A (en) * | 2020-11-12 | 2021-02-05 | 合肥工业大学 | Harmonic starting permanent magnet synchronous motor |
| CN113964989A (en) * | 2021-11-09 | 2022-01-21 | 上海电气集团上海电机厂有限公司 | 8-way parallel connection method for high-speed high-power 4-pole three-phase asynchronous motor |
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1999
- 1999-08-10 CN CNB991165950A patent/CN1140959C/en not_active Expired - Fee Related
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102468729A (en) * | 2010-11-02 | 2012-05-23 | 郭保安 | Five-pole started energy-saving wound rotor type motor |
| CN102468730A (en) * | 2010-11-02 | 2012-05-23 | 郭保安 | Four-pole started energy-saving wound rotor type motor |
| CN102801229A (en) * | 2011-05-24 | 2012-11-28 | 永济新时速电机电器有限责任公司 | Low-noise traction motor |
| CN103944332A (en) * | 2014-03-21 | 2014-07-23 | 雷勃电气（苏州）有限公司 | Three-phase asynchronous motor |
| CN104659992A (en) * | 2015-02-04 | 2015-05-27 | 华北电力大学 | 6/8/12-pole single-winding three-speed asynchronous motor stator winding mode |
| CN110086392A (en) * | 2019-04-26 | 2019-08-02 | 宁德师范学院 | The method for expanding permanent torque frequency control range is connected using Y type winding strap tap |
| CN110086392B (en) * | 2019-04-26 | 2020-11-27 | 宁德师范学院 | Method for expanding constant-torque variable-frequency speed regulation range by adopting Y-shaped winding with tap connection |
| CN110635721A (en) * | 2019-09-18 | 2019-12-31 | 合肥工业大学 | Soft start winding type brushless double-fed motor |
| CN112332628A (en) * | 2020-11-12 | 2021-02-05 | 合肥工业大学 | Harmonic starting permanent magnet synchronous motor |
| CN113964989A (en) * | 2021-11-09 | 2022-01-21 | 上海电气集团上海电机厂有限公司 | 8-way parallel connection method for high-speed high-power 4-pole three-phase asynchronous motor |
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