CN102158030A - Multiwinding series connection variable volume induction motor and control device thereof - Google Patents
Multiwinding series connection variable volume induction motor and control device thereof Download PDFInfo
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- CN102158030A CN102158030A CN 201110096439 CN201110096439A CN102158030A CN 102158030 A CN102158030 A CN 102158030A CN 201110096439 CN201110096439 CN 201110096439 CN 201110096439 A CN201110096439 A CN 201110096439A CN 102158030 A CN102158030 A CN 102158030A
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Abstract
The invention discloses a multiwinding series connection variable volume induction motor and a control device thereof. The multiwinding series connection variable volume induction motor is provided with a stator winding, wherein the stator winding is formed by compounding three sets of three-phase windings; the three sets of windings are correspondingly connected in series respectively; each phase of winding is provided with three line outlet ends; the three-phase windings are provided with nine line outlet ends in total and respectively correspond to a high-power grade, a medium-power grade and a low-power grade; each set of winding is distributed in a single layer; and three contactors of the control device are respectively connected with the line outlet ends of the three sets of windings so as to realize three-power three-grade switching. The three-phase windings adopt a Y connection method. The three sets of windings are in Y-delta mixed series connection; delta connection is adopted in a high-power volume connection method; a Y-delta mixed series connection method is used for medium-power volume; and a 2Y-delta mixed series connection method is used for low power. Compared with the prior art, the invention can be more favorably suitable for the condition of load change and has the advantages of large starting torque, high running efficiency and power factor, simplicity and convenience for control, high reliability, obvious reduction of no-load current and good energy saving effect.
Description
Technical field
The invention belongs to technical field of motors, be specifically related to a kind of many windings in series varying capacity induction motor and electrical control gear thereof.
Background technology
Belt conveyor during the China's Metallurgical Mines material loads at present, and when the pumping-unit motor in oil exploitation starting or operation, heavy duty and underloading even unloaded often alternately appearance of situation exist serious " low load with strong power " phenomenon and cause inefficiency, and energy consumption is serious.For adapting to such load, motor generally will be by heavy-load start or service requirement apolegamy, but the actual loading rate is little can cause the motor light running so again the time, and efficient and power factor are low.Carry the motor requirement of the efficient operation of matched load variation automatically for satisfying, a lot of schemes were once proposed both at home and abroad, as adopt high slip motor, magneto and two stator motors etc., but these schemes or improvement are little, or cost is too high and control complexity etc., thereby can not adapt to requirement of actual application.
Summary of the invention
For solving the problems referred to above that prior art exists, the objective of the invention is to propose a kind of many windings in series varying capacity induction motor, this electronic function adapts to the situation of load variations better, starting torque is big, operational efficiency and power factor height, control easy, good reliability, no-load current significantly descends, good energy-conserving effect.
Another object of the present invention is to provide a kind of control device of this many windings in series varying capacity induction motor, have stable performance, after high capacity motor starts,, be transformed into the middle power or the low power run of motor automatically by the automatic control equipment time-delay.
For achieving the above object, the technical solution used in the present invention: this many windings in series varying capacity induction motor, has stator winding, it is characterized in that: three phase windings are compound constitutes by three covers for described stator winding, and this each correspondence of three covers winding is connected in series, and every phase winding has 3 leading-out terminals, three-phase has 9 leading-out terminals, every cover winding is that individual layer is arranged, the leading-out terminal of described three cover windings is connected with three contactors in the executive circuit in the control device respectively, thereby realizes the switching of many power varying capacity.
Described three phase windings are the Y connection.
Described three cover windings adopt the Y-Δ to mix and are connected in series, and are that Δ connects for the high power capacity connection, mix tandem-type connection for middle power capacity for the Y-Δ, mix tandem-type connection for low-power for the 2Y-Δ.
Described control device has the high power start-up circuit, middle power operation circuit and low power run circuit, high power starts after be converted to middle power operation circuit or low power run circuit after starting the time-delay of time delay module several seconds, through current signal Acquisition Circuit and discriminator circuit the detection of motor current size is differentiated, last more power operation circuit in the delay anti-jamming circuit conversion in limited time, middle power operation circuit signal feeds back to discriminator circuit, following more in limited time through delay anti-jamming circuit conversion low power run module, the low power run circuit signal feeds back to discriminator circuit.
Described low power run circuit and the operation of middle power circuit are connected with accumulative total and move timing circuit.
Described current signal Acquisition Circuit is connected with open-phase protection circuit and circuit overcurrent protection.
Has crawl levelling weighing apparatus circuit in the executive circuit of described control device, described crawl levelling weighing apparatus circuit has the sensitive switch that is attempted by respectively on high power starting relay coil, middle power operation relay coil and the low power run relay coil branch road, and the sensitive switch that is arranged in high power starting relay path of winding is parallel with high power starting relay normal open switch.
This many windings in series varying capacity induction electric machine stator has three cover windings, and these windings in series connect, and form many power shelves of selectable varying capacity, are realized the switching of many power varying capacity by three contactors.Wherein the high power shelves have high starting torque, are used for heavy-load start or operation, and starting process finishes, and visual loading condition maintenance high power shelves move or change over to middle power and the low-power shelves move.This motor can mate conveyer load or pump load well, compare with other technical scheme of studying in present this class dragging system, the situation that can adapt to load variations better, starting torque is big, operational efficiency and power factor height, control easy, good reliability, no-load current significantly descends, thereby has more good energy-saving effect.The electric control circuit of this motor has the high power start-up circuit, start after the several seconds time-delay by high power during start, power or low power run in being automatically brought to, size at motor automatic measurement motor current in service, when power in the motor normally moves, owing to when load reduces (rated current 80%), be transformed into low power run automatically; When motor when low-power is normally moved because load is when increasing (rated current 120%), power operation in being transformed into automatically; When motor when middle power normally moves because load increasing always, when being increased to 120% times of rated current, over-current protection system will be moved, and control circuit is cut off the power supply, motor is out of service; No matter motor is to move under middle power or low power state, contacts bad or the phase failure if electric current or motor are a certain, and open-phase protection circuit will move immediately, disconnects control circuit, makes motor out of service; No matter motor is to move under certain state, if when the voltage of electrical network is lower than setting, the undervoltage protection system of ND-3SK will disconnect control circuit, makes motor out of service.Accumulative total is moved timing circuit and respectively power in the record of motor or low power run time is noted accurately, and sees the running time of certain power of motor from the display screen of charactron intuitively.
In the used for oil-field oil pumper motor, when assembling test run debugging, need the dynamic equilibrium counterweight, existing method is controlled insensitive, by being attempted by the sensitive switch of high power starting relay coil in the crawl levelling weighing apparatus circuit, be easy to the motor crawl is controlled, carry out the dynamic balancing adjustment faster, look for the dynamic balancing difficulty thereby solved.
Description of drawings
Below in conjunction with accompanying drawing specific embodiments of the invention are described in further detail.
Fig. 1 is that three phase windings are the connection diagram of Y connection.
Fig. 2 is the connection diagram that three cover windings adopt the Y-Δ to be connected in series.
Fig. 3 is Z=48, p=2 triple line ring recess distribution phase figure.
Fig. 4 is Z=48, and p=2 three cover individual layer three-phase windings in series make up many power winding connection figure.
The drawing of Fig. 5 electric electromechanics gas control.
Fig. 6 Motor Control theory diagram.
Embodiment
Many windings in series varying capacity induction motor as shown in Figure 1, three phase windings are compound constitutes by three covers for this motor stator winding, and the connection that is in series of this each correspondence of three covers winding is respectively with subscript " A1, B1, C1; A2, B2, C2; A3, B3, C3 " to distinguish; every phase winding has 3 leading-out terminals; three-phase has 9 leading-out terminals; these 9 external leading-out terminals reach " UL, VL, WL " differentiation with " UH, VH, WH " and " UM, VM, WM " respectively, and wherein subscript " H " and " M " reach " L " and represent high, medium and low two capacitance grades respectively.Three phase mains inserts from leading-out terminal " UH, VH, WH ", and at this moment three phase windings are the Y connection, corresponding high power capacity shelves; Three phase mains inserts from leading-out terminal " " UM, VM, WM " ", and at this moment three phase windings are the Y connection, capacity shelves in the correspondence; Three phase mains inserts from leading-out terminal " UL, VL, WL ", and at this moment three phase windings still are the Y connection, corresponding low capacity shelves.Because the equal corresponding Y of these three kinds of connections connects, adopt three three-phase contactors can easyly carry out three retaining switchings between each capacity reliably,
Shown in Figure 1 this three cover winding constructions are said so identical from principle, for reducing the number of plies of winding coil in stator slot, generally requiring every cover winding is single layer winding.The characteristics of this mode of connection are to adopt three contactors can carry out varying capacity three retainings easily to switch, adjust each self-corresponding winding coil number of turn of third gear and then can conveniently obtain third gear power division ratio, also be that this third gear actual power can design as required, thereby make motor operate in optimum Working according to the load adjustment.
Three cover windings connections as shown in Figure 2 also can adopt the Y-Δ to be connected in series, and may more performance be arranged at the low-power shelves like this.With comparing such as three-phase winding Y-technology such as Δ connection conversion that present induction machine adopted, the connection of this New-type electric machine winding has more characteristics.Tradition Y-Δ connection conversion winding can only be accomplished corresponding two grades of power and changing-over complexity, and two grades of corresponding winding coil turns-in-series ratios of its Y and Δ connection are confined to fixed numbers
Can not adjust, can't guarantee motor is moved by optimum Working under a lot of situations.The present invention has adopted the method for three cover stator winding coupled in series, the corresponding different gear power number of turn that whenever is in series is reduced, and make capacity motor reduce the design philosophy that increases with the number of turn, also promptly pressing capacity motor distributes, the motor windings of corresponding from low to high two the power shelves number of turn that whenever is in series reduces gradually, the corresponding number of turn at most of low-grade power, the corresponding minimum number of turn of high power shelves, make to possess the simplest also the most reliable conversion regime between each power shelves like this, also can adapt to and still can keep the working condition requirement of efficient operation when motor load changes.The key of technology that employing three cover stator winding coupled in series " subtract circle " is, every cover winding is 60 ° of distribution standards of three-phase single layer winding, therefore learning concept is clear, design easily, easy to adjust, the winding harmonic content is few, can guarantee the performance of motor under each gear fully, to satisfy the requirement of starting and operation.
With motor pole number 2p=4, three phase windings that groove is counted Z=48 are that example specifies below.
Figure 3 shows that number of poles 2p=4, groove is counted Z=48 triple line ring recess distribution phase figure.For the groove coil distribution of A shown in Figure 3, B, 60 ° of facies tracts of C three-phase standard, get odd number or even bin coil and constitute Three-phase Single-layer Windings separately respectively, the connection that is in series of three phase winding correspondences of these individual layers.Figure 3 shows that concrete connection method with three cover three-phase individual layer series connection windings.The coil of this three covers winding uses subscript " 1,2,3 " to distinguish respectively among Fig. 4.As can be seen from Figure 4, low-power shelves winding is that 60 ° of facies tract tandem compounds of three cover standards form, at this moment all winding conductor is utilized, has best performance, and the motor load characteristics have determined the low-power shelves the most commonly used under many circumstances, suitably the corresponding watt level of design low-power shelves just can guarantee that motor machine system is in best efficient running status.It can also be seen that by Fig. 4, middle power shelves are that 60 ° of facies tract tandem compounds of two cover standards form, relative low-power, whenever the number of turn that is in series reduces, thereby load capacity strengthens, the corresponding cover Three-phase Single-layer Windings of high power shelves, because the number of turn that at this moment whenever is in series is minimum, thereby at this moment motor has maximum starting capability.Here the number of turn that is noted that every cover winding can be adjusted arbitrarily according to designing requirement, thereby guarantees that corresponding three the power shelves of winding not only have characteristics separately but also have good performance, to be fit to motor load operating mode in most cases.
As Fig. 5, control device circuit shown in 6, described control circuit has the high power start-up circuit, middle power operation circuit and low power run circuit, high power starts after be converted to middle power operation circuit or low power run circuit after starting the time-delay of time delay module several seconds, through current signal Acquisition Circuit and discriminator circuit the detection of motor current size is differentiated, last more power operation circuit in the delay anti-jamming circuit conversion in limited time, middle power operation circuit signal feeds back to discriminator circuit, following more in limited time through delay anti-jamming circuit conversion low power run module, the low power run circuit signal feeds back to discriminator circuit.Described low power run circuit and middle power operation circuit are connected with accumulative total respectively and move timing circuit 1ST, 2ST, can add up low power run time and middle power running time, thereby the effect of convenient statistics economize on electricity, simultaneously can judge the operating mode of the oil well that is moved, thereby better carry out the counterweight adjustment according to running time.Described current signal Acquisition Circuit is connected with open-phase protection circuit and circuit overcurrent protection.Contact bad or the phase failure if electric current or motor are a certain, open-phase protection circuit will move immediately, disconnects control circuit, makes motor out of service; No matter motor is to move under certain state, if when the voltage of electrical network is lower than setting, the undervoltage protection system of ND-3SK will disconnect control circuit, makes motor out of service.As shown in Figure 5, has crawl levelling weighing apparatus circuit in the executive circuit of described control circuit, described crawl levelling weighing apparatus circuit has sensitive switch 1AT, 2AT, the 3AT that is attempted by respectively on high power starting relay coil, middle power operation relay coil and the low power run relay coil branch road, and the sensitive switch that is arranged in high power starting relay path of winding is parallel with high power starting relay normal open switch 1KM.When assembling needed to adjust dynamic balancing, crawl 1AT, 2AT, 3AT easily realized dynamically balanced adjustment.
Claims (7)
1. the induction motor of windings in series varying capacity more than a kind, has stator winding, it is characterized in that: three phase windings are compound constitutes by three covers for described stator winding, this each correspondence of three covers winding is connected in series, every phase winding has 3 leading-out terminals, and three-phase has 9 leading-out terminals, and every cover winding is that individual layer is arranged, the leading-out terminal of described three cover windings is connected with three contactors in the executive circuit in the control device respectively, thereby realizes the switching of many power varying capacity.
2. many windings in series varying capacity induction motor according to claim 1 is characterized in that: described three phase windings are the Y connection.
3. many windings in series varying capacity induction motor according to claim 1, it is characterized in that: described three cover windings adopt the Y-Δ to mix and are connected in series, for the high power capacity connection is that Δ connects, mix tandem-type connection for middle power capacity for the Y-Δ, mix tandem-type connection for the 2Y-Δ for low-power.
4. many windings in series varying capacity arrangement for controlling induction motor according to claim 1, it is characterized in that: described control device has the high power start-up circuit, middle power operation circuit and low power run circuit, high power starts after be converted to middle power operation circuit or low power run circuit after starting the time-delay of time delay module several seconds, through current signal Acquisition Circuit and discriminator circuit the detection of motor current size is differentiated, last more power operation circuit in the delay anti-jamming circuit conversion in limited time, middle power operation circuit signal feeds back to discriminator circuit, following more in limited time through delay anti-jamming circuit conversion low power run module, the low power run circuit signal feeds back to discriminator circuit.
5. many windings in series varying capacity arrangement for controlling induction motor according to claim 4 is characterized in that: described low power run circuit and the operation of middle power circuit are connected with accumulative total and move timing circuit.
6. many windings in series varying capacity arrangement for controlling induction motor according to claim 4 is characterized in that: described current signal Acquisition Circuit is connected with open-phase protection circuit and circuit overcurrent protection.
7. many windings in series varying capacity arrangement for controlling induction motor according to claim 4, it is characterized in that: have crawl levelling weighing apparatus circuit in the executive circuit of described control device, described crawl levelling weighing apparatus circuit has the sensitive switch that is attempted by respectively on high power starting relay coil, middle power operation relay coil and the low power run relay coil branch road, and the sensitive switch that is arranged in high power starting relay path of winding is parallel with high power starting relay normal open switch.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201110096439.5A CN102158030B (en) | 2011-04-07 | 2011-04-07 | Multiwinding series connection variable volume induction motor and control device thereof |
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| CN201110096439.5A CN102158030B (en) | 2011-04-07 | 2011-04-07 | Multiwinding series connection variable volume induction motor and control device thereof |
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| CN102158030B CN102158030B (en) | 2014-08-20 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102832876A (en) * | 2012-09-19 | 2012-12-19 | 北京交通大学 | Stator integer slot and fractional slot winding conversion running system of induction motor and running method |
| KR101730011B1 (en) * | 2012-10-05 | 2017-04-25 | 에이비비 슈바이쯔 아게 | Rotor structure and electrical machine |
| CN109194198A (en) * | 2018-09-14 | 2019-01-11 | 北京交通大学 | The starting and operation control system and control method of energy-efficient induction conductivity |
| CN113394935A (en) * | 2021-06-08 | 2021-09-14 | 武汉理工大学 | Variable power three-phase motor |
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| CN101692593A (en) * | 2009-09-01 | 2010-04-07 | 南阳防爆集团新普电机有限公司 | Dual-power induction motor for conveyor |
| CN101986531A (en) * | 2010-11-12 | 2011-03-16 | 武汉金路达电机有限公司 | Alternating-current pole-changing three-speed three-phase induction motor |
| CN202004604U (en) * | 2011-04-07 | 2011-10-05 | 南阳高特电机有限公司 | Multi-winding serial-connection variable-capacity induction motor and control device thereof |
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Patent Citations (6)
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| US4937513A (en) * | 1983-04-29 | 1990-06-26 | Emerson Electric Co. | Tapped auxiliary winding for multi-speed operation of electric motor and method therefor |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102832876A (en) * | 2012-09-19 | 2012-12-19 | 北京交通大学 | Stator integer slot and fractional slot winding conversion running system of induction motor and running method |
| CN102832876B (en) * | 2012-09-19 | 2015-04-22 | 北京交通大学 | Stator integer slot and fractional slot winding conversion running system of induction motor and running method |
| KR101730011B1 (en) * | 2012-10-05 | 2017-04-25 | 에이비비 슈바이쯔 아게 | Rotor structure and electrical machine |
| CN109194198A (en) * | 2018-09-14 | 2019-01-11 | 北京交通大学 | The starting and operation control system and control method of energy-efficient induction conductivity |
| CN113394935A (en) * | 2021-06-08 | 2021-09-14 | 武汉理工大学 | Variable power three-phase motor |
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| CN102158030B (en) | 2014-08-20 |
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