CN102158030B - 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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- CN102158030B CN102158030B CN201110096439.5A CN201110096439A CN102158030B CN 102158030 B CN102158030 B CN 102158030B CN 201110096439 A CN201110096439 A CN 201110096439A CN 102158030 B CN102158030 B CN 102158030B
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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 current China's Metallurgical Mines material loads, and when the pumping-unit motor in oil exploitation starting or operation, the often alternately appearance of situation that heavy duty and underloading are even unloaded, exists serious " low load with strong power " phenomenon and causes inefficiency, and energy consumption is serious.For adapting to such load, motor generally will be by the apolegamy of heavy-load start or service requirement, but actual loading rate is little can cause motor light running so again time, and efficiency and power factor are low.For meet carrying the requirement that motor can the efficient operation of Auto-matching load variations, 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 high cost and control complicatedly etc., thereby can not adapt to the requirement of practical application.
Summary of the invention
The problems referred to above that exist for solving prior art, the object 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 large, operational efficiency and power factor are high, control easy, good reliability, no-load current significantly declines, good energy-conserving effect.
The control device that another object of the present invention is to provide a kind of this many windings in series varying capacity induction motor, has stable performance, after high capacity motor starts, by automatic control equipment time delay, is automatically transformed into middle power or the low power run of motor.
For achieving the above object, the technical solution used in the present invention: this many windings in series varying capacity induction motor, there is stator winding, it is characterized in that: cover three phase windings are compound forms by three 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 executive circuit in control device respectively, thereby realize many power varying capacity, switches.
Described three phase windings are Y connection or adopt Y-△ mixing to be connected in series, the low-power shelves winding of corresponding low-power capacity is that 60 ° of facies tract tandem compounds of three cover standards form, in correspondence, the middle power shelves winding of power capacity is that 60 ° of facies tract tandem compounds of two cover standards form, and the high power shelves winding of corresponding high power capacity is a set of Three-phase Single-layer Windings.
Described control device has high power start-up circuit, middle Power operation circuit and low power run circuit, high power starts by being converted to middle Power operation circuit or low power run circuit after startup time delay module several seconds time delay, the detection and identification to motor current size through current signal Acquisition Circuit and discriminator circuit, upper Power operation circuit in delay anti-jamming circuit conversion in limited time, middle Power operation circuit signal feeds back to discriminator circuit, more lower in limited time through delay anti-jamming circuit conversion low power run module, 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 and move timing circuit.
Described current signal Acquisition Circuit is connected with open-phase protection circuit and circuit overcurrent protection.
In the executive circuit of described control device, there is crawl balance-seeking circuit, described crawl balance-seeking circuit has the sensitive switch being attempted by respectively on high power starting relay coil, middle Power operation relay coil and 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 forms many power shelves of selectable varying capacity, is realized the switching of many power varying capacity by three contactors.Wherein high power shelves have high starting torque, and for heavy-load start or operation, the complete visual loading condition of starting process keeps the operation of high power shelves or proceeds to middle power and the operation of low-power shelves.This motor can mate conveyer load or pump load well, compare with other technical scheme of studying in current this class dragging system, the situation that can adapt to better load variations, starting torque is large, operational efficiency and power factor are high, control easy, good reliability, no-load current significantly declines, thereby the energy-saving effect having had more.The electric control circuit of this motor has high power start-up circuit, during start, by high power, started by several seconds time delay, be automatically brought to middle power or low power run, size at motor automatic measurement motor current in service, when in motor, power normally moves, while reducing (rated current 80%) due to load, be automatically transformed into low power run; When motor is when low-power is normally moved, while increasing (rated current 120%) due to load, be automatically transformed into middle Power operation; When motor is when middle power normally moves, because load is increasing always, while being increased to 120% times of rated current, over-current protection system will be moved, and makes control circuit power-off, and motor is out of service; No matter motor is to move under middle power or low power state, if a certain bad or disconnected phase that contacts of electric current or motor, 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 the voltage of electrical network during 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 recorded accurately, and from the display screen of charactron, sees intuitively the running time of certain power of motor.
In used for oil-field oil pumper motor, when assembling test run debugging, need dynamic equilibrium counterweight, existing method is controlled insensitive, by being attempted by the sensitive switch of high power starting relay coil in crawl balance-seeking circuit, be easy to motor crawl to control, carry out faster dynamic balancing adjustment, thereby solved, look for dynamic balancing difficulty.
Accompanying drawing explanation
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 Y-△ 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 tri-cover individual layer three-phase windings in series combine many power winding connection figure.
Fig. 5 motor electric drawings.
Fig. 6 Motor Control theory diagram.
Embodiment
Many windings in series varying capacity induction motor as shown in Figure 1, cover three phase windings are compound forms by three for this motor stator winding, and the connection that is in series of this each correspondence of three covers winding, 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 are distinguished with " UH, VH, WH " and " UM, VM, WM " and " UL, VL, WL " respectively, and wherein subscript " H " and " M " and " L " represent respectively high, medium and low two capacitance grades.Three phase mains is from leading-out terminal " UH, VH, WH " access, and at this moment three phase windings are Y connection, corresponding high power capacity shelves; Three phase mains is from leading-out terminal " " UM, VM, WM " " access, and at this moment three phase windings are Y connection, capacity shelves in correspondence; Three phase mains is from leading-out terminal " UL, VL, WL " access, and at this moment three phase windings are still Y connection, corresponding low capacity shelves.Due to these three kinds of connections, equal corresponding Y connects, and adopt three three-phase contactors can easyly carry out reliably three gears between each capacity and switch,
This shown in Fig. 1 three cover winding constructions say identical from principle, and for reducing the number of plies of winding coil in stator slot, the every cover winding of General Requirements is single layer winding.The feature of this mode of connection is to adopt three contactors can carry out easily varying capacity three gears to switch, adjust each self-corresponding winding coil number of turn of third gear and can conveniently obtain third gear power division ratio, also be that this third gear actual power can required design, thereby make motor operate in optimum Working according to adjustment of load.
Three cover windings connections as shown in Figure 2 also can adopt Y-△ to be connected in series, and may have better performance at low-power shelves like this.What adopted with current induction machine compares such as technology such as three-phase winding Y-delta connection conversions, and the connection of this New-type electric machine winding has more feature.Tradition Y-delta 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 delta connection are confined to fixed numbers
can not adjust, in a lot of situations, cannot guarantee motor is moved by optimum Working.The present invention has adopted the method for three cover stator winding coupled in series, the corresponding different gear power number of turn that is often in series is reduced, and make capacity motor with the number of turn, reduce the design philosophy increasing, also pressing capacity motor distributes, the motor winding of corresponding two the power shelves number of turn that is often in series reduces gradually from low to high, the corresponding number of turn at most of low-grade power, the corresponding minimum number of turn of high power shelves, make like this to possess conversion regime the most reliably between each power shelves, in the time of also can adapting to motor load variation, still can keep the working condition requirement of efficient operation.The key of technology that employing three cover stator winding coupled in series " subtract circle " is, every cover winding is 60 ° of distribution standard single layer winding of three-phase, therefore learning concept is clear, design easily, easy to adjust, winding harmonic content is few, can guarantee the performance of motor under each gear completely, to meet the requirement of starting and operation.
With motor pole number 2P=4, three phase windings that groove is counted Z=48 are that example illustrates 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 of A shown in Fig. 3, B, 60 ° of facies tracts of C three-phase standard, distribute, get odd number or even bin coil and form respectively separately Three-phase Single-layer Windings, the connection that is in series of three phase winding correspondences of these individual layers.Figure 3 shows that the concrete connection method with three cover three-phase single-layer series connection windings.In Fig. 4, the coil of this three covers winding uses respectively subscript " 1,2,3 " to distinguish.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, there is best performance, and motor load feature has determined that low-power shelves are the most conventional under many circumstances, suitably the corresponding watt level of design low-power shelves, just can guarantee that motor machine system is in the efficient running status of the best.By Fig. 4, be it can also be seen that, middle power shelves are that 60 ° of facies tract tandem compounds of two cover standards form, relative low-power, the number of turn that is often in series reduces, thereby load capacity strengthens, the corresponding a set of Three-phase Single-layer Windings of high power shelves, because the number of turn that is at this moment often 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 feature separately but also have good performance, to be applicable in most cases motor load operating mode.
As Fig. 5, control device circuit shown in 6, described control circuit has high power start-up circuit, middle Power operation circuit and low power run circuit, high power starts by being converted to middle Power operation circuit or low power run circuit after startup time delay module several seconds time delay, the detection and identification to motor current size through current signal Acquisition Circuit and discriminator circuit, upper Power operation circuit in delay anti-jamming circuit conversion in limited time, middle Power operation circuit signal feeds back to discriminator circuit, more lower in limited time through delay anti-jamming circuit conversion low power run module, low power run circuit signal feeds back to discriminator circuit.Described low power run circuit and middle Power operation circuit are connected with respectively accumulative total and move timing circuit 1ST, 2ST, can add up low power run time and middle Power operation time, thereby the effect of convenient statistics economize on electricity, can can judge the operating mode of moved oil well according to running time, thereby better carry out counterweight adjustment simultaneously.Described current signal Acquisition Circuit is connected with open-phase protection circuit and circuit overcurrent protection.If a certain bad or disconnected phase that contacts of electric current or motor, 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 the voltage of electrical network during lower than setting, the undervoltage protection system of ND-3SK will disconnect control circuit, makes motor out of service.As shown in Figure 5, in the executive circuit of described control circuit, there is crawl balance-seeking circuit, described crawl balance-seeking circuit has sensitive switch 1AT, 2AT, the 3AT being attempted by respectively on high power starting relay coil, middle Power operation relay coil and 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 needs to adjust dynamic balancing, crawl 1AT, 2AT, 3AT, easily realize dynamically balanced adjustment.
Claims (4)
1. the induction motor of windings in series varying capacity more than a kind, there is stator winding and control device, it is characterized in that: cover three phase windings are compound forms by three 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 executive circuit in control device respectively, thereby realize many power varying capacity, switches, described three phase windings are Y connection or adopt Y-△ mixing to be connected in series, the low-power shelves winding of corresponding low-power capacity is that 60 ° of facies tract tandem compounds of three cover standards form, in correspondence, the middle power shelves winding of power capacity is that 60 ° of facies tract tandem compounds of two cover standards form, and the high power shelves winding of corresponding high power capacity is a set of Three-phase Single-layer Windings, described control device has high power start-up circuit, middle Power operation circuit and low power run circuit, high power starts by being converted to middle Power operation circuit or low power run circuit after startup time delay module several seconds time delay, the detection and identification to motor current size through current signal Acquisition Circuit and discriminator circuit, upper Power operation circuit in delay anti-jamming circuit conversion in limited time, middle Power operation circuit signal feeds back to discriminator circuit, more lower in limited time through delay anti-jamming circuit conversion low power run module, low power run circuit signal feeds back to discriminator circuit.
2. many windings in series varying capacity induction motor according to claim 1, is characterized in that: described low power run circuit and middle Power operation circuit are connected with accumulative total and move timing circuit.
3. many windings in series varying capacity induction motor according to claim 1, is characterized in that: described current signal Acquisition Circuit is connected with open-phase protection circuit and circuit overcurrent protection.
4. many windings in series varying capacity induction motor according to claim 1, it is characterized in that: in the executive circuit of described control device, there is crawl balance-seeking circuit, described crawl balance-seeking circuit has the sensitive switch being attempted by respectively on high power starting relay coil, middle Power operation relay coil and 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 |
|---|---|---|---|
| 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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| 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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| CN102158030A CN102158030A (en) | 2011-08-17 |
| CN102158030B true CN102158030B (en) | 2014-08-20 |
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| 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 |
| EP2717432A1 (en) * | 2012-10-05 | 2014-04-09 | ABB Technology AG | Rotor structure and electrical machine |
| CN109194198B (en) * | 2018-09-14 | 2022-03-11 | 北京交通大学 | Starting and running control system and method for induction motor |
| CN113394935A (en) * | 2021-06-08 | 2021-09-14 | 武汉理工大学 | Variable power three-phase motor |
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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 |
| CN201066828Y (en) * | 2007-07-20 | 2008-05-28 | 颜善荣 | Electromotive intelligent power-saving starter |
| CN101447720A (en) * | 2008-12-15 | 2009-06-03 | 南阳华大博元高科技研发中心 | Novel tri-power, efficient, energy-saving three-phase asynchronous motor used for oil extractor |
| CN101692593B (en) * | 2009-09-01 | 2012-02-15 | 南阳防爆集团新普电机有限公司 | Dual-power induction motor for conveyor |
| CN101986531B (en) * | 2010-11-12 | 2012-06-20 | 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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