CN1556577A - High actuating torque low operating power three phase capacitane type bisquirrel motor - Google Patents
High actuating torque low operating power three phase capacitane type bisquirrel motor Download PDFInfo
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- CN1556577A CN1556577A CNA2004100210294A CN200410021029A CN1556577A CN 1556577 A CN1556577 A CN 1556577A CN A2004100210294 A CNA2004100210294 A CN A2004100210294A CN 200410021029 A CN200410021029 A CN 200410021029A CN 1556577 A CN1556577 A CN 1556577A
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Abstract
The invention belongs to electric motor, especially relates to triphase capacitance double rotor cage electric motor with high starting torque and low running power, which is made up of a stator, a rotor and a shaft. The stator slot of the electric motor is embedded with tow sets of low harmony concentric triphase symmetric phase change double-layer windings, the compensation windings 3-1 is connected with a capacitance C in series, the electric motor double rotor cage arranges two types, one is casting aluminum alloy double rotor cage rotor, the second one is casting aluminum double rotor cage rotor, the double rotor cage rotor is low drain reactance, the work winding and the compensation winding of the stator are connected in parallel onto the triphase power, when starting, the motor outputs high starting torque and inputs low starting current, high starting factor; when the electric motor runs normally, it can output the low power, high efficiency, high power factor, high overloading ability, which is a small 'horse' but driving large car, it saves the energy, belongs to the high efficiency energy-saving electric motor.
Description
Technical field
The invention belongs to motor, particularly a kind of high starting torque hangs down operate power three-phase Capacitor double cage motor.
Technical background
At present, countries in the world are in the alternating electromotive force drive system, the kind of motor and kind have many, but, as beam pumping unit, plunger type water pump and heavy duty starting machinery are as crane, ribbon conveyer, compressor etc. for big inertia impact machinery, and they all have very big moment of inertia and moment of inertia, drag the motor of this class machinery, must have very big starting torque.When adopting three-phase squirrel cage motor to drag, for satisfying the requirement of high starting torque, motor must be selected big capacity, and like this, the low load with strong power phenomenon just appears in the starting back when normally moving.When motor moved under underload, efficient and power factor reduced, and will cause that generator loss increases, and wasted energy, and had improved production cost, so how to develop the low operate power three-phase squirrel cage motor of high starting torque, were the big problems that common people pay close attention to.
In these years.Adopt three kinds of special threephase asynchronouses both at home and abroad: first kind has the high starting torque threephase asynchronous, as homemade JQO
2Series when being used on the beam pumping unit tool, the low load with strong power phenomenon occurs under the normal operation; Second kind of high-slip threephase asynchronous, as homemade YH series, efficient is low during operation, and power factor is low; The third double speed three phase asynchronous motor, under coal mine, use on the belt conveyor, facts have proved, it has two key issues: the one, the control appliance complexity, cost an arm and a leg, simultaneously behind the motor starting by low speed when high speed switched, mechanical and electric on will produce very big impact, cause the failure rate height, even damage equipment, the 2nd, when normally moving also the low load with strong power phenomenon can appear.
Summary of the invention
The objective of the invention is to overcome above-mentioned technical deficiency, provide a kind of high starting torque to hang down operate power three-phase Capacitor double cage motor.
The technical scheme that the present invention solves its technical problem employing is: a kind of by stator, rotor (rotor bar, rotor end ring) and the motor formed of axle, be characterized in that the motor stator pilot trench is embedded in the low harmonic wave concentric type three symmetrical phase shift two layer winding of two covers, wherein a cover compensation winding (first winding) is low harmonic wave concentric type three-phase symmetry two layer winding, every capacitor C of all connecting mutually=60～80 μ F embed the bottom of stator slot, at the bottom land place, work winding (second winding) is low harmonic wave concentric type three-phase symmetry two layer winding, embed the top of stator slot, at the notch place; When the every extremely every phase groove number of motor was q, the upper strata winding of establishing first winding was respectively N in the number of turn of stator slot
11, N
12, N
13, N
14... N
1q, they are A
1Phase, it is N that lower floor's umber of turn is arranged opposite with the upper strata winding
1q, N
14, N
13, N
12, N
11, they are C
1Phase, the number of turn of upper strata winding in stator slot of second winding is respectively N
21, N
22, N
23, N
24... N
2q, they are A
2Phase, it is N that lower floor's umber of turn is arranged opposite with the upper strata winding
2q, N
24, N
23, N
22, N
21, they are C
2Phase; Whenever the be in series ratio of the number of turn of work winding and compensation winding is 2～6 times; The pitch y of two cover winding coil groups of work winding and compensation winding
1, y
2, y
3, y
4... y
qAll identical, form two cover three-phase symmetric double cover windings; Phase shift is meant by motor direction of rotation n
2Calculate, before the end of the same name of compensation winding draws in α electrical degree of work winding end of the same name, α=115 °～135 °; The winding of motor is all got low current density, the current density Δ of its work winding
2=2.5A/mm
2Below; The current density Δ of compensation winding
1=3～4A/mm
2The current density Δ of rotor bar
B=2.1A/mm
2Below; The current density Δ of rotor end ring
R=1.2A/mm
2Below; The work winding of motor stator and compensation winding also are connected on the three phase mains; The double-cage rotor of motor is established two types: the one, and the cast aluminium alloy double-cage rotor, the 2nd, cast-in aluminum two-cage rotor, and double-cage rotor is low leakage reactance.
The invention has the beneficial effects as follows: distance and the low starting current of input, high starting quality factor are changeed in the high starting of this motor output during starting; Exportablely when motor normally moves satisfy the required low-power of manufacturing machine, high efficiency, High Power Factor, high overload ability, it is a kind of motor of high load with small power, fundamentally solved low load with strong power phenomenon in the alternating electromotive force transmission, save the energy, belong to a kind of high-efficiency and energy-saving type motor.
Description of drawings
Specify with embodiment below in conjunction with accompanying drawing.
Fig. 1 shows that high starting torque hangs down operate power three-phase Capacitor double cage motor structure chart.
The stator slot shape dimensional drawing of Fig. 2 diagrammatic sketch 1.
The rotor slot shape dimensional drawing of Fig. 3 diagrammatic sketch 1.
Utmost point is organized conductor arrangement and the number of turn distribution map of q=4 mutually in the low harmonic wave concentric type three symmetrical phase shift two layer winding of two covers of Fig. 4 diagrammatic sketch 1.
The structure chart of the low coil groups of harmonic wave concentric type winding of the q=4 of Fig. 5 diagrammatic sketch 1.
A pair of developed winding diagram under extremely in the low harmonic wave concentric type three symmetrical phase shift two layer winding of two covers of Fig. 6 diagrammatic sketch 1.
The wiring circle of two cover windings of Fig. 7 diagrammatic sketch 1.
Among the figure, 1-stator; 2-stator slot; 3-1-compensation winding; 3-2-work winding coil; 4-rotor; The two cage grooves of 5-rotor; 6-rotor bar; 7-rotor end ring; 8-axle; G-air-gap is long; N
14, N
13, N
12, N
11-the first winding lower floor; N
11, N
12, N
13, N
14-the first winding upper strata; N
24, N
23, N
22, N
21-the second winding lower floor; N
21, N
22, N
23, N
24-the second winding upper strata; 1,2,3 ... 24-groove number; An o-coil half turn limit; A
1, A
2, B
1, B
2, C
1, C
2The head end of-two covers three phase windings; A
1, A
2, B
1, B
2, C
1, C
2The end of-two covers three phase windings; C-electric capacity; α-electrical degree; y
1～y
4-coil span; n
2-motor direction of rotation
Embodiment
With reference to accompanying drawing 1, this motor is by stator 1, rotor 4 (rotor bar 6, rotor end ring 7) and axle 8 form, be characterized in being embedded in the low harmonic wave concentric type three symmetrical phase shift two layer winding 3-1 of two covers at motor stator pilot trench 2,3-2, wherein a cover compensation winding 3-1 is low harmonic wave concentric type three symmetrical phase shift two layer winding, every equal mutually series capacitance C, capacitor C=70 μ F, embed the bottom of stator slot 2, bottom land place at stator slot 2, work winding 3-2 is low harmonic wave concentric type three symmetrical phase shift two layer winding, embed the top of stator slot 2, at the notch place of stator slot 2; The iron core outer diameter D of stator 1
1=400mm, inside diameter D
I1=285mm, stator core length L=225mm, rotor 4 iron core inside diameter D
I2=85mm, the long g=0.6mm of air-gap, stator slot 2 is 72, rotor 5 is 58.The size of stator slot 2 (seeing accompanying drawing 2): h
So=1.0mm, h
S1=0.8mm, h
S2=27mm, b
O1=3.8mm, b
S1=6.7mm, R=5.5mm, θ
s=30 °, the size of rotor 5 (seeing accompanying drawing 3): h
Ro=0.85mm, h
R1=10mm, h
R2=2mm, h
R3=18.65mm, Ф=7mm, b
O2=3.8mm, b
R1=4mm, b
R2=7mm, b
R3=2.6mm, θ
R=30 °.When the every extremely every phase groove number of motor is q=4 (seeing accompanying drawing 4),, design the distribution that does not wait the number of turn, establish the first winding 3-1 upper strata winding and be respectively N in the number of turn of stator slot 2 by the minimum principle of the magnetomotive winding coefficient of odd harmonic
11, N
12, N
13, N
14, they are A
1Phase, lower floor's umber of turn is arranged opposite with the upper strata winding, is N
14, N
13, N
12, N
11, they are C
1Phase, the first winding 3-1 number of turn that whenever is in series is 40 circles; The upper strata winding of second group of 3-2 is respectively N in the number of turn of stator slot 2
21, N
22, N
23, N
24, they are A
2Phase, lower floor's umber of turn is arranged opposite with the upper strata winding, is N
24, N
23, N
22, N
21, they are C
2Phase, the second winding 3-2 number of turn that whenever is in series is 236 circles; Whenever the be in series ratio of the number of turn of work winding 3-2 and compensation winding 3-1 is 5.9 times.The pitch identical (seeing accompanying drawing 5) of the two cover concentric coil groups of work winding 3-2 and compensation winding 3-1 is y
1=11 grooves, y
2=9 grooves, y
3=7 grooves, y
4=5 grooves.Motor is 6 utmost points, in the expanded view of a pair of low harmonic wave concentric type three symmetrical phase shift two layer winding of two covers of extremely descending motor stator 2 as shown in Figure 6, the wherein a pair of utmost point has 24 grooves, groove numbering is by 1～24, and the half turn limit of a coil is with symbol " O " expression, and the limit, upper strata of a coil and lower floor limit are with identical number of turn symbolic representation, first subscript in two notes angle symbol of the number of turn, expression first or second winding, second subscript represented the number of turn of different slots, presses motor direction of rotation n
2Calculate, first winding end of the same name is N for example
11When being positioned at No. 1 groove, the N of second winding end of the same name then
21Should be positioned at groove No. 9, this moment the first winding 3-1 end of the same name draw just before in the α=120 ° electrical degree of the end of the same name of the second winding 3-2, among the first winding 3-1 by upper strata winding lead-out wire terminal A
1, B
1, C
1Be first the cover three phase windings head end, among the first winding 3-1 by the winding lead-out wire terminal A of lower floor
1, B
1, C
1Be first the cover three phase windings end, among the second winding 3-2 by upper strata winding lead-out wire terminal A
2, B
2, C
2Be second the cover three phase windings head end, among the second winding 3-2 by the winding lead-out wire terminal A of lower floor
2, B
2, C
2Be the end of second cover, three phase windings, each is connected together lower floor's winding of two cover windings on the contrary; Motor two cover three phase windings (as shown in Figure 7) all are connected into triangle, and are connected on the three phase mains.For adapting to the needs of big inertia impact manufacturing machine such as beam pumping unit, the rotor of motor is the cast aluminium alloy double-cage rotor, each winding all adopts the low current density value during design motor, its objective is when motor starting, make each winding can bear enough big starting heat load, when motor normally moves, each winding has enough big current overload ability, can bear bigger impact overload, the copper loss of each winding is low, the motor efficiency height.During the design motor, 3-2 is low in its leakage reactance of the notch place of stator slot 2 for low leakage reactance, work winding for rotor bar 7.Work winding 3-2 has bigger perceptual starting current during motor starting, rotor 4 produces a high value starting torque, compensation winding 3-1 is the capacitive starting current, when two windings are in parallel, equal the total starting current of motor perceptual starting current and capacitive rise electric current vector and, total starting current is reduced, realize the purpose of low starting current.Revolutional slip was very little when motor normally moved, and the rotor operation impedance is very big, and work winding 3-2 electric current reduces, and motor will be exported a low-power that adapts to the load needs.Work winding 3-2 and rotor bar 7 are low leakage reactance, and the motor breakdown torque is very big, and motor torque overload capacity height can bear bigger impact overload.Motor stator winding 3-1,3-2 adopt low harmonic wave concentric type three-phase symmetry two layer winding, the higher harmonic current that has suppressed motor effectively, make capacitor C not influenced by higher harmonics, motor noise reduces, the motor iron-core supplementary load loss also reduce simultaneously, have improved motor efficiency more than 90%.The compensation winding 3-1 capacitor C=70 μ F that whenever are in series are equivalent to traditional compensation technique of external capacitive is on the spot changed into now by motor interior capacitance compensation technology, and motor can approach 1.0 to the power factor of electrical network, motor power (output) factor height.
15KW motor of the present invention and existing 37KW high starting torque threephase asynchronous are compared as follows on design performance:
Motor of the present invention aims at the motor that beam pumping unit has designed 15KW, the stator 1 of motor and the core dimensions of rotor 4 and flute profile size as mentioned above, the design performance of motor when specified operation is: phase voltage U
1=380V, revolutional slip S
e=0.0112, power output P
e=15KW, compensation winding 3-1 phase current I
1e=9.560733579A, work winding 3-2 phase current I
1e=17.2501546394A, the total phase current I of motor
e=15.54739472A, powerfactorcos
e=0.999145728, nominal torque T
e=155.5386753N-m, breakdown slip S
m=0.186506625, breakdown torque T
Max=1156.353273N-m, torque overload ability λ
m=7.434506375, the total copper loss p of motor
Cu=497.5277217W, motor iron loss p
Fe=719.7W, motor efficiency η
e=0.91, the total copper consumption G of stator winding
Cu=20.73825509Kg, iron core is with iron amount G
Fe=270.776Kg; The motor starting performance is: phase voltage U
1=380V, compensation winding 3-1 starting phase current I
1=9.058529354A, work winding 3-2 starting phase current I
2=257.5811895A always starts phase current I
St=250.4897584A, starting torque T
St=934.596N-m, starting current times i
St=16.11136549, starting torque multiple m
St=6.00876919, starting quality factor γ=3.7311.By the on-the-spot actual test in oil field as can be known, former 37KW motor is when viscosity of crude is big, oil pumper needs repeatedly the cycling start of crawl ability, power is about 15KW during operation, when substituting the former 37KW high starting torque of beam pumping unit threephase asynchronous, can make the smooth cycling start of oil pumper, motor load rate β=1.0 when normally moving as usefulness 15KW motor of the present invention, press 7000 hours running times of oil pumper year and calculate, the annual loss energy value E=11148.20386KWH (degree) of utility model motor.
For 15KW motor of the present invention and former 37KW high starting torque threephase asynchronous are made comparisons on design performance, quote former 37KW motor designs data and performance as follows: stator and rotor core size, stator and rotor number average and 15KW motor of the present invention are identical, and stator slot shape is of a size of: h
S0=1mm, h
S1=0.8mm, h
S2=26.4mm, R=4.5mm, θ
s=30 °, b
01=3.8mm, b
S1=6.7mm rotor slot shape is of a size of: h
R0=0.85mm, h
R1=5mm, h
R2=1.4mm, h
R3=24mm, θ
R=30 °, b
02=1.5mm, h
R1=2mm, h
R2=7mm, h
R3=4.4mm, φ=5.7mm, motor are 6 utmost points, and stator is double-deck repeatedly winding, makes triangle and connects, and the number of turn that whenever is in series is 224 circles, and the stator winding copper consumption is G
Cu=28.53Kg, iron core is G with the iron amount
Fe=270.776Kg, rotor are cast-in aluminum two-cage rotor; Motor design performance when specified operation is: phase voltage U
1=380V, revolutional slip S
e=0.0162, power output P
e=37KW, phase current I
1e=39.9144A, powerfactorcos
e=0.89724, nominal torque T
e=372.6659754N-m, breakdown slip S
m=0.07694, breakdown torque T
Max=372.6659754N-m, torque overload ability λ
m=2.39, the total copper loss p of motor
Cu=1723.411746W, motor iron loss p
Fe=719.7W, electric efficiency η
e=0.92; The motor starting performance is: the U of phase voltage
1=380V, starting phase current I
St=244A, starting torque T
St=699.2493987N-m, starting current times i
St=6.113143258, starting torque multiple m
St=1.9, starting quality factor γ=2.8658; When dragging beam pumping unit with the 37KW motor, run into viscosity of crude when very big, motor can not normal starting, and the low load with strong power phenomenon has appearred in the load factor β of motor=0.4054 when normally moving; Actual efficiency η=0.89818136 and powerfactorcos=0.778586912 at β=0.4054 o'clock motor, pressing 7000 hours running times of oil pumper year calculates, the 37KW motor is when poor efficiency and low power factor operation, the annual loss energy value E=26978.60661KWH (degree) of 37KW motor, the design performance contrast of 15KW motor of the present invention and existing 37KW motor is as follows:
1, when core dimensions is identical, the ratio of starting torque is 1.34 times, and the starting torque of this 15KW motor has been equivalent to the starting torque of 48KW high starting torque threephase asynchronous, when dragging beam pumping unit with this 15KW motor, because of the starting torque height, can shorten the starting time, reduced the motor starting loss, saves energy, and motor rotation blockage and burn-out motor winding can not start the time.
2, when core dimensions is identical, the ratio of starting quality factor is 1.3 times, has shown that this motor can obtain bigger starting torque under the unit starting current.
3, when core dimensions is identical, the ratio of total starting current is 1.027 times, work winding 3-2 starting current is 1.056 times with the ratio of former 37KW motor starting electric current, because the current density of work winding 3-2 and rotor bar 7 is got low value, under the short starting time, the starting heat load of work winding 3-2 and rotor bar 7 is not high, can not burn out the motor winding.
4, when core dimensions is identical, the ratio of breakdown torque is 1.334 times, and the ratio of torque overload ability is 3.111 times.The stator winding current density Δ=4A/mm of former 37KW motor
2, the work winding 3-2 current density Δ 2=2.5A/mm of this 15KW motor
2, this motor current overload capacity is 1.6 times of former 37KW motor.Therefore when normal operation, this motor is being no more than under the permission temperature condition, and its torque overload ability and current overload ability have reached the level of 48KW high starting torque threephase asynchronous.
5, at the core dimensions phase time, when replacing the 37KW motor to drag beam pumping unit with this motor, annual electric energy 1.58 ten thousand degree of saving.
6, when core dimensions is identical, the ratio of mechanical characteristic hardness is 0.554.When two motor during at identical torque ripple, this motor is 1.805 with the ratio of 37KW motor revolution fluctuation.Therefore, the mechanical property of this motor is softer, is more suitable for the needs of beam pumping unit.
7, when core dimensions is identical, on the copper consumption, this motor lacks 27.3% than 37KW motor copper consumption.
8, because this motor has adopted capacitor C internal compensation technology, make power factor be bordering on 1.0.Make in the intra-field power network that electric current reduces on the power transmission line, reduced line loss, reduced supply transformer capacity, reduced the capacitance of high-pressure side high pressure compensation capacitor, these factors can be saved substantial contribution.
By above-mentioned performance more as can be known, this motor has unique advantages, can substitute the used high starting torque threephase asynchronous of present beam pumping unit fully, the 15KW high starting torque of designing by the core dimensions of 37KW motor hangs down operate power three-phase Capacitor double cage motor, it has reached the technical performance of 48KW high starting torque threephase asynchronous on starting performance and runnability, be equivalent to high load with small power, fundamentally solved big inertia impact machinery and heavy-load start machinery low load with strong power un-reasonable phenomenon in the alternating electromotive force transmission, waste energy and the problem of fund.According to the unequally loaded needs,, can design the low operate power three-phase Capacitor double cage motor of high starting torque of series, to adapt to the needs in market by electric machine theory of the present invention and method for designing.
Claims (3)
1, the low operate power three-phase Capacitor double cage motor of a kind of high starting torque is made up of stator (1), rotor (4) and axle (8), it is characterized in that:
A, be embedded in the low harmonic wave concentric type three symmetrical phase shift two layer winding of two covers at motor stator pilot trench (2), wherein a cover compensation winding (first winding) is (3-1) for hanging down harmonic wave concentric type three-phase symmetry two layer winding, the every group of capacitor C of all connecting, C=60～80 μ F, embed the bottom of stator slot (2), at the bottom land place, work winding (second winding) is (3-2) for hanging down harmonic wave concentric type three-phase symmetry two layer winding, embed the top of stator slot (2), at the notch place;
B, when the every extremely every phase groove number of motor is q, establish first winding (3-1) upper strata winding and be respectively N in the number of turn of stator slot (2)
11, N
12, N
13, N
14... N
1q, they are A
1Phase, it is N that lower floor's umber of turn is arranged opposite with the upper strata winding
1q... N
14, N
13, N
12, N
11, they are C
1Phase, the number of turn of upper strata winding in stator slot of second winding (3-2) is respectively N
21, N
22, N
23, N
24... N
2q, they are A
2Phase, lower floor's umber of turn is arranged opposite with the upper strata winding, is N
2q... N
24, N
23, N
22, N
21, they are C
2Phase;
Whenever the be in series ratio of the number of turn of c, work winding (3-2) and compensation winding (3-1) is 2～6 times, and work winding (3-2) and compensation winding (3-1) two overlap the coil span y of windings
1, y
2, y
3, y
4... y
qAll identical, form three-phase symmetric winding;
D, phase shift are meant by motor direction of rotation n
2Calculate, before the end of the same name of compensation winding (3-1) draws in α electrical degree of work winding (3-2) end of the same name, α=115～135 °;
The winding of e, motor is all got low current density, the current density Δ of its work winding (3-2)
2=2.5A/mm
2Below, the current density Δ of compensation winding (3-1)
1=3～4A/mm
2, the current density Δ of rotor bar (6)
B=2.1A/mm
2Below, the current density Δ of rotor end ring (7)
R=1.2A/mm
2Below.
2, the low operate power three-phase Capacitor double cage motor of a kind of high starting torque according to claim 1, the double-cage rotor (4) that it is characterized in that motor is established two types, the one, the cast aluminium alloy double-cage rotor, the 2nd, cast-in aluminum two-cage rotor, and double-cage rotor is low leakage reactance.
3, the low operate power three-phase Capacitor double cage motor of a kind of high starting torque according to claim 1 is characterized in that the work winding (3-2) of motor stator (1) and compensates winding (3-1) and be connected on the three phase mains.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100210294A CN100384065C (en) | 2004-01-07 | 2004-01-07 | High actuating torque low operating power three phase capacitane type bisquirrel motor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100210294A CN100384065C (en) | 2004-01-07 | 2004-01-07 | High actuating torque low operating power three phase capacitane type bisquirrel motor |
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|---|---|
| CN1556577A true CN1556577A (en) | 2004-12-22 |
| CN100384065C CN100384065C (en) | 2008-04-23 |
Family
ID=34351879
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|---|---|---|---|
| CNB2004100210294A Expired - Fee Related CN100384065C (en) | 2004-01-07 | 2004-01-07 | High actuating torque low operating power three phase capacitane type bisquirrel motor |
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| CN2272628Y (en) * | 1996-03-12 | 1998-01-14 | 重庆升立技术有限公司 | Far polar ratio four-speed single armature motor for lifting mechanism |
| CN2270311Y (en) * | 1996-06-25 | 1997-12-10 | 常发祥 | Motor for beam-pumping unit |
| JP2003333811A (en) * | 2002-05-12 | 2003-11-21 | Yoshimitsu Okawa | Induction motor having a plurality of axially divided stator windings |
| CN2674755Y (en) * | 2004-01-07 | 2005-01-26 | 杨芳春 | High-starting rotary torque low running power three-phase capacitance type double cage motor |
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- 2004-01-07 CN CNB2004100210294A patent/CN100384065C/en not_active Expired - Fee Related
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| CN107017709A (en) * | 2017-05-31 | 2017-08-04 | 广东美芝制冷设备有限公司 | Motor stator, magneto and compressor |
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