CN1243354A - Internally-located frequency-sensitive variable-resistance started induction motor - Google Patents
Internally-located frequency-sensitive variable-resistance started induction motor Download PDFInfo
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- CN1243354A CN1243354A CN 98112566 CN98112566A CN1243354A CN 1243354 A CN1243354 A CN 1243354A CN 98112566 CN98112566 CN 98112566 CN 98112566 A CN98112566 A CN 98112566A CN 1243354 A CN1243354 A CN 1243354A
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Abstract
The present invention includes external casing, stator and rotor, its stator winding possesses starting pole and running pole, its rotor winding adopts undulated winding, and synthesizes the pole pitches into a pair of polar pitches of running pole, and makes the running pole connect with phase slot number coil to form a closed loop. The built-in frequency-sensitive variable-resistance structure is formed from squirrel-cage grooves set on the rotor and squirrel-cage strips positioned in these squirrel-cage grooves, in which one end of every squirrel-cage strip is connected with one end of the undulated winding element in turn, and its another end is connected to common end ring or connected with another end of the rotor undulated winding element in turn. It eliminates electric brush and slide ring, and raises the running reliability, and can keep high starting torque in the entire starting process.
Description
The present invention relates to induction motor, be meant that further its inside is equipped with the induction motor of frequency-sensitive variable-resistance started dependency structure.
Traditional wound rotor induction motor needs to seal in starting resistance by slip ring, brush and improves starting performance, starting resistance must be excised during operation.The existence of slip ring, brush not only makes the motor manufacturing cost increase, and becomes the main root that breaks down in service.No. 85102382 patent documentation has proposed a kind of harmonic starting method, and it becomes operation utmost point 2P and two kinds of numbers of poles of starting utmost point 2Q with the motor stator design of Windings; With the rotor design of Windings be, the rotor current of starting pole field induction must be through directly being connected the starting resistance on the rotor winding, and to improve starting performance, the rotor current of operation pole field induction is then without this starting resistance, to guarantee runnability.By the harmonic starting wound rotor induction motor of this method design, owing to cancelled mechanisms such as slip ring, brush, its above-mentioned inherent shortcoming has also just been eliminated.But the shortcoming of this harmonic starting motor is, the starting resistance that seals on the rotor immobilizes, unlike traditional wound-rotor motor, in starting process, excised step by step, do not accomplish that the quicker rheostat of picture frequency can reduce on automatic smoothing ground like that, thereby can't guarantee that higher starting torque is all arranged in whole starting process.
The objective of the invention is, design internally-located frequency-sensitive variable-resistance started induction motor, make to be fixedly connected on epitrochanterian resistance and can to reduce by the such automatic smoothing of the quick rheostat of picture frequency, make starting torque in whole starting process, all keep higher numerical value, thereby overcome the deficiency of prior art.
Technical scheme of the present invention is, described internally-located frequency-sensitive variable-resistance started induction motor comprises shell, stator, the rotor of armature spindle is housed, stator winding has starting utmost point 2Q and two kinds of numbers of poles of operation utmost point 2P, the rotor winding adopts wave winding, architectural feature of the present invention is, the resultant pitch of described rotor wave winding equals a pair of operation utmost point pole span, connecting into a closed-loop path at the extremely synchronous groove coil of operation, rising and employing additional resistance is built-in frequency-sensitive variable-resistance structure, this structure is by being located at epitrochanterian cage grooves and placing the squirrel-cage bar of described cage grooves to form, one end of squirrel-cage bar is connected with described rotor wave winding element one end successively, and the other end of described squirrel-cage bar is received public end ring or is connected with the other end of rotor wave winding element successively.
In the said structure of the present invention, the starting pole field is at the synthetic electromotive force of described each closed-loop path induction, as long as the starting utmost point is selected suitably, then must be zero, can not form loop current, this moment, frequency-sensitive variable-resistance structure (device) squirrel-cage bar two terminal potentials did not wait, and rotor current will be realized frequency-sensitive variable-resistance started by wherein.
Make below in conjunction with accompanying drawing and to further specify.
Description of drawings:
Fig. 1 is the rotor core structure schematic diagram of cage grooves when being located on the rotor core body;
Fig. 2 is that cage grooves is located at the rotor core structure schematic diagram of armature spindle when outer;
Fig. 3 is the rotor core structure schematic diagram (figure rotor axle left end be broken section structure) of cage grooves when being located at thorax in the rotor core;
Fig. 4 is that cage grooves is to be located at the schematic diagram (figure rotor axle left end is the broken section structure) the during combining structure on surface, garden outward of thorax and armature spindle in the rotor core;
Fig. 5 to Figure 12 is respectively the part expanded view that different situation lower rotor part wave windings are connected with squirrel-cage bar (winding).
Figure 13 is the structural representation of frequency-sensitive variable-resistance structure when being located on the shaft extension end of rotor.
In described accompanying drawing:
100-rotor core 200-rotor 300-(rotating shaft) skin
400-armature spindle 500-garden shape groove 600-cage grooves
700-open slot 800-open slot 900-open slot
The public end ring of 101-rotor winding 201-squirrel-cage bar 301-
401-adds iron core
The coil of the numeral place groove in the accompanying drawing beyond the above-mentioned label number.
By Fig. 1 to Fig. 4 as can be known, frequency-sensitive variable-resistance structure of the present invention has the cage grooves (600) that is located on the rotor core (100).Fig. 1 is that described cage grooves (600) is located at the structure situation on the iron-core workpiece of rotor core (100), it is the garden shape groove (500) that is located on the iron-core workpiece, through hole (promptly run through rotor core) or the blind hole of this garden shape groove (500) for axially being provided with according to rotor core (100); When it is blind hole, be preferably disposed on the non-shaft extension side of motor, this moment, available one group of steel pipe was formed the iron-core workpiece part that has described groove (500).Fig. 2 is that described cage grooves (600) is located at the structure situation when layer (300) is gone up outside the armature spindle (400) of rotor core (100), and it also is a garden shape groove (500), and the frame mode of described groove (500) is identical with the described structure of above-mentioned Fig. 1.
Fig. 3 is the structure situation of cage grooves described in the present invention (600) when being arranged on the interior thorax of rotor core (100), its open slot (700) (its opening direction can be regarded as the axis towards rotor core (100)) for axially offering along rotor core (100), and each groove with according to rotor core (100) radially (promptly with axially vertical cross section garden week) evenly be distributed as suitablely, aforementioned garden shape groove (500) is also radially evenly to be distributed as suitable according to described rotor core (100).Fig. 4 is the structure situation of open slot (900) when correspondence combines on described cage grooves (600) surface, garden outside armature spindle (400) by open slot (800) that is separately positioned on the interior thorax of rotor core (100) and relative set, and its distribution is identical with the described structure of above-mentioned Fig. 3.
The epitrochanterian cage grooves (600) that is located at of the present invention can also be provided in a side of armature spindle surface, outer garden and comply with its open slot of axially offering, i.e. open slot as shown in Figure 4 (900).This kind situation can be regarded as the structure of only not wanting described interior thorax open slot (800) with the open slot among Fig. 4 (900).
The rotor upper cage groove (600) that is located at of the present invention can also be that it is arranged on structure (as shown in figure 13) on described armature spindle (400) the shaft extension end, this structure is provided with an additional iron core (401) on described shaft extension end, on this additional iron core (401), offer corresponding cage grooves, and the concrete setting of corresponding cage grooves comprises Fig. 1 to Fig. 4 and aforementioned all corresponding construction situations (can regard described additional iron core as that from frequency sensitive trheostat structure angle Fig. 1 is to rotor core shown in Figure 4 this moment).Described shaft extension end is meant that armature spindle stretches out the part of rotor core, comprises any end at two ends, and additional iron core is arranged on any suitable location of described shaft extension end.
As can be seen, the rotor of indication of the present invention comprises rotor core and armature spindle, armature spindle is regarded as the part of rotor." built-in " of internally-located frequency-sensitive variable-resistance structure of the present invention is meant the brush, slip ring of cancellation prior art and described structure directly is connected with the rotor element of winding.
For reducing the quantity of described cage grooves (600), can allow every adjacent shared cage grooves of two squirrel-cage bars.
Rotor wave winding of the present invention both can adopt bilayer, also can adopt individual layer (being the single layer winding that every groove has only a conductor).The individual layer wave winding has two kinds of versions.First kind is, the first segment that wave winding moves the utmost point relatively is apart from being odd number, and whole winding is only with the odd bin coil or only use the even bin coil, and all the other wire casings are only in order to hold another limit of coil.Second kind is, when the operation utmost point pole span in the rotor number when being even, the first segment of wave winding is apart from be even number, whole winding with odd number to (first pair: 1,2 grooves of groove coil; The 3rd pair: 5,6 grooves; The 5th pair: 9,10 grooves ...) or only use (second pair: 3,4 grooves of even-even groove coil; The 4th pair: 7,8 grooves; The 6th pair: 11,12 grooves ...), all the other grooves are only in order to hold another limit of coil.
Below in conjunction with specific embodiment structure of the present invention and principle are made and to be further described.
Fig. 5 is 2P=8,2Q=6 or 10, and the groove of rotor (200) is counted Z
2Part expanded view when=48 double deck type connects by the mode of " squirrel-cage bar one end is connected with rotor wave winding element one end successively; the squirrel-cage bar other end is received public end ring " (calling first kind of connected mode in the following text) apart from the squirrel-cage bar of winding and frequency-sensitive variable-resistance structure, this connected mode is all suitable for cage grooves (600) structure of Fig. 1 to Fig. 4 and Figure 13.The wave winding resultant pitch equals to move the very a pair of pole span of 8 utmost points, and 8 very synchronous groove coils all are connected to the closed-loop path, promptly 1-13-25-37,2-14-26-38,3-15-27-39,4-16-28-40 ..., be 12 loops.Because of 4 the groove coils in each closed-loop path electromotive force when 8 utmost points is identical, the internal impedance pressure drop is identical, and each coil end at the whole story is in equipotential, so squirrel-cage bar also all is in equipotential, no current passes through, and is equivalent to that frequency sensitive trheostat is cut to go out rotor circuit.4 the groove coils in each closed-loop path synthetic electromotive force when 6 utmost points or 10 utmost points is equal to zero.With first loop is example, during to 6 utmost points or 10 utmost points, and groove 1 and 25 electromotive force antiphases, groove 13 and 37 electromotive force antiphases, synthetic electromotive force is zero, can not form loop current.No current does not then have the internal impedance pressure drop, cause the end at the whole story of each coil to have potential difference, there is potential difference in every squirrel-cage bar two ends, rotor current will enter frequency sensitive trheostat (being the frequency-sensitive variable-resistance structure), express a coil of rotor wave winding and the starting current loop of corresponding two squirrel-cage bars and the formation of part common port ring with thick line among the figure.
When squirrel-cage bar has electric current to pass through, in solid core (100), will form a rotating magnetic field corresponding to slip frequency, cause eddy current loss, be equal to the effect of wire wound asynchronous motor frequency sensitive trheostat starting.The ratio of squirrel-cage bar electric current and rotor coil limit electric current is 2SinQ π/P in this example, and 6,10 utmost points are all equaled
Described winding not only has frequency-sensitive variable-resistance started effect to 6,10 utmost points, to other as 2,4,12,14,18,20 ... the multiple utmost point Deng the inoperative utmost point also all has frequency-sensitive variable-resistance started effect, but the operation utmost point and the multiple utmost point thereof are not then had this effect, and its 2SinQ π/P value equals zero.
Fig. 6 is 2P=8, Z
2The whole part expanded view when winding is connected by first kind of above-mentioned connected mode with frequency rheostat squirrel-cage bar of=48 individual layers.It is to cast out even-even groove coil from Fig. 5, and its cage-shaped structure draws groove coil and corresponding squirrel-cage bar thereof for keeping odd number, so half is reduced in the closed-loop path, the squirrel-cage bar number reduces half.But the starting number of poles that is suitable for is constant, and this kind form individual layer wave winding only is applicable to Z
2The situation of/2P=even number.
Fig. 7 is 2P=8, Z
2Part expanded view when=48 short distance individual layer wave windings are connected by described first kind of connected mode with the squirrel-cage bar of frequency-sensitive variable-resistance structure.The wave winding first segment is apart from being odd number 5, and whole is 7 apart from slot pitch second pitch of weak point, whole apart from long slot pitch, and resultant pitch still is a pair of pole span 12 of the operation utmost point.Whole winding has only the odd bin coil, and the closed-loop path of formation is formed by the odd bin coil.Closed-loop path number, squirrel-cage bar number have all reduced half.Squirrel-cage bar electric current and rotor coil limit current ratio and the starting number of poles that is suitable for are all identical with Fig. 5, Fig. 6 situation.
Fig. 8 and Fig. 9 are 2P=8, Z
2=48 double-deck whole part expanded views when connecting by the mode of " squirrel-cage bar one end is connected with an end of rotor wave winding element successively, and the squirrel-cage bar other end is connected with the wave winding element other end successively " (calling second kind of connected mode in the following text) apart from winding.Fig. 8 receives respectively on the assembly head of rotor winding half dollar spare for the squirrel-cage bar two ends, and Fig. 9 has moved to nearly rotor notch place for tie point, to shorten connecting line.Also express the loop situation that starting current forms among the figure with thick line.Squirrel-cage bar electric current and rotor coil limit current ratio are 2CosQ pi/2 P.Except that 2Q is the odd-multiple of 2P and to make this ratio be zero, other any number of poles can both be realized frequency-sensitive variable-resistance started.
Figure 10 is 2P=8, Z
2Part expanded view when=48 individual layer short distance windings are connected by described second kind of connected mode with the frequency sensitive trheostat squirrel-cage bar.Dotted line is represented squirrel-cage bar, and thick line illustrates the loop that the starting electrode current constitutes.Squirrel-cage bar electric current and rotor coil limit current ratio are 2CosQ pi/2 P.It is identical with Fig. 8, Fig. 9 to have frequency-sensitive variable-resistance started effect.
Figure 11 is 2P=8, Z
2=48 whole part expanded views when single layer winding is connected by described second kind of connected mode with the frequency sensitive trheostat squirrel-cage bar, dotted line is a squirrel-cage bar, thick line illustrates the loop of starting current formation.Squirrel-cage bar electric current and rotor coil limit current ratio 1+2Cos " 2 π Q/3P ".It is every that the non-vanishing any number of poles of this ratio all can be realized is frequency-sensitive variable-resistance started.
Figure 12 is 2P=8, Z
2The whole part expanded view when winding is connected by described second kind of connected mode with the frequency sensitive trheostat squirrel-cage bar of=48 individual layers, wherein dotted line is represented squirrel-cage bar, and thick line illustrates the loop of starting the electrode current formation.Whole winding only with an odd bin coil, and can constitute individual layer whole apart from the time, must meet the condition that pole span equals odd number.As 2P=4, Z2=12,20,28,36 2P=6, Z2=18,30,42,54 ... Deng.Squirrel-cage bar electric current and rotor coil limit current ratio are 1+2Cos " 2 π Q/5P "+2Cos " 4 π Q/5P ".Every this ratio that can not make is that zero any starting extremely all can realize frequency-sensitive variable-resistance started.
As known from the above, the present invention is an internally-located frequency-sensitive variable-resistance started induction motor, it with the comparison of frequency-sensitive variable-resistance started wire wound asynchronous motor, mechanism and devices such as slip ring, brush have been cancelled, eliminated the main root that motor breaks down, improved operational reliability, reduced maintenance cost, manufacturing cost also decreases; It and existing harmonic starting wire wound asynchronous motor relatively have more excellent starting performance, and whole starting process all keeps higher starting torque.
Claims (11)
1, a kind of internally-located frequency-sensitive variable-resistance started induction motor, comprise shell, stator, the rotor of armature spindle is housed, stator winding has starting utmost point 2Q and two kinds of numbers of poles of operation utmost point 2P, the rotor winding adopts wave winding, feature of the present invention is, the resultant pitch of described rotor wave winding equals a pair of operation utmost point pole span, connecting into a closed-loop path at the extremely synchronous groove coil of operation, rising and employing additional resistance is built-in frequency-sensitive variable-resistance structure, this structure is by being located at epitrochanterian cage grooves and placing the squirrel-cage bar of described cage grooves to form, one end of squirrel-cage bar is connected with described rotor wave winding element one end successively, and the other end of described squirrel-cage bar is received public end ring or is connected with the other end of rotor wave winding element successively.
2, internally-located frequency-sensitive variable-resistance started induction motor according to claim 1 is characterized in that, described to be located at epitrochanterian cage grooves be garden shape groove on the rotor core body, and this garden shape groove is through hole or the blind hole that axially is provided with according to rotor core.
3, internally-located frequency-sensitive variable-resistance started induction motor according to claim 1 is characterized in that, described through hole or the blind hole that axially is provided with according to rotor core on the rotating shaft skin that epitrochanterian cage grooves is a rotor core that be located at.
According to claim 2 or 3 described internally-located frequency-sensitive variable-resistance started induction motors, it is characterized in that 4, when described cage grooves was blind hole, it formed this iron core that has cage grooves partly at the non-shaft stretching end of motor with one group of steel pipe.
5, internally-located frequency-sensitive variable-resistance started induction motor according to claim 1 is characterized in that, described to be located at epitrochanterian cage grooves be the open slot that is arranged on the rotor core inner chamber and axially is provided with according to rotor core.
6, internally-located frequency-sensitive variable-resistance started induction motor according to claim 1 is characterized in that, describedly is located at epitrochanterian cage grooves and is combined by open slot that is separately positioned on thorax in the rotor core and the corresponding open slot correspondence that is located at the outer surface, garden of armature spindle.
7, internally-located frequency-sensitive variable-resistance started induction motor according to claim 1 is characterized in that, described to be located at epitrochanterian cage grooves be to be located at armature spindle surface, outer garden and according to its open slot of axially offering.
8, internally-located frequency-sensitive variable-resistance started induction motor according to claim 1, it is characterized in that, describedly be located at epitrochanterian cage grooves for being located at the structure on the described rotor shaft extension end, this structure is provided with an additional iron core on described shaft extension end, offer corresponding cage grooves on this additional iron core.
9, internally-located frequency-sensitive variable-resistance started induction motor according to claim 1 is characterized in that, every shared cage grooves of adjacent two squirrel-cage bars.
10, internally-located frequency-sensitive variable-resistance started induction motor according to claim 1, it is characterized in that, the rotor wave winding is the single layer winding that every groove has only a conductor, its first segment distance of moving the utmost point relatively is an odd number, whole winding is only with the odd bin coil or only use the even bin coil, and all the other coils hold another limit of coil.
11, internally-located frequency-sensitive variable-resistance started induction motor according to claim 1, it is characterized in that, the rotor wave winding is the single layer winding that every groove has only a conductor, the first segment distance is an even number, whole winding only with odd number to the groove coil or only use even-even groove coil, all the other wire casings hold another limit of coil.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 98112566 CN1243354A (en) | 1998-07-28 | 1998-07-28 | Internally-located frequency-sensitive variable-resistance started induction motor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 98112566 CN1243354A (en) | 1998-07-28 | 1998-07-28 | Internally-located frequency-sensitive variable-resistance started induction motor |
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| CN1243354A true CN1243354A (en) | 2000-02-02 |
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| CN 98112566 Pending CN1243354A (en) | 1998-07-28 | 1998-07-28 | Internally-located frequency-sensitive variable-resistance started induction motor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107251383A (en) * | 2015-02-09 | 2017-10-13 | 东芝三菱电机产业系统株式会社 | Cage-type rotary motor and its rotor and method for manufacturing rotor |
-
1998
- 1998-07-28 CN CN 98112566 patent/CN1243354A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107251383A (en) * | 2015-02-09 | 2017-10-13 | 东芝三菱电机产业系统株式会社 | Cage-type rotary motor and its rotor and method for manufacturing rotor |
| CN107251383B (en) * | 2015-02-09 | 2019-07-23 | 东芝三菱电机产业系统株式会社 | Cage-type rotary motor and its rotor and method for manufacturing rotor |
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