CN201656714U

CN201656714U - Novel dual-power high-efficiency energy-saving induction motor

Info

Publication number: CN201656714U
Application number: CN2009202733497U
Authority: CN
Inventors: 王雪帆; 王得霖
Original assignee: NANYANG HUADA BOYUAN HIGH-TECH RESEARCH AND DEVELOPMENT CENTER
Current assignee: NANYANG HUADA BOYUAN HIGH-TECH RESEARCH AND DEVELOPMENT CENTER
Priority date: 2009-11-21
Filing date: 2009-11-21
Publication date: 2010-11-24
Anticipated expiration: 2019-11-21

Abstract

The utility model discloses a novel dual-power high-efficiency energy-saving induction motor, which comprises a rotor and a stator winding. Each phase of the three-phase stator winding is divided into three sections adopting a delta plus Y wiring method or a Y plus Y wiring method. In the delta plus Y wiring method, the delta wiring end is a terminal corresponding to a high-power connecting wire, and the Y wiring end is a terminal corresponding to a low-power connecting wire. In the Y plus Y wiring method, a first 1Y wiring end is a terminal corresponding to a high-power connecting wire and a second 1Y wiring end is a terminal corresponding to a low-power connecting wire. The wiring conversion of the terminal of the high-power connecting wire and the terminal of the low-power connecting wire in the delta plus Y wiring method or the Y plus Y wiring method is realized by two contactors. The novel motor is applicable to one or two voltage(s) and is provided selectable high- and low- power shifts. Moreover, the utility model has the advantages of large starting torque, high operating efficiency, large power factor, simple control, high reliability, significantly low no-load current, and good energy-saving effect.

Description

A kind of novel pair of power, efficient, energy-saving induction motor

Technical field

The utility model belongs to technical field of motors, is specifically related to a kind of novel pair of power, efficient, energy-saving induction motor.

Background technology

In many mechanical devices (as oil-field oil pumper, colliery conveyer, ball mill, blower fan, water pump, compressor etc.), its dragging motor system all exists " low load with strong power " phenomenon to some extent, causes waste of energy serious, and operational efficiency is low.Main cause: the one, the matching requirements heavy load starting that has needs very big detent torque during startup, and load torque and little when normally moving, or even no-load running; The 2nd, the device that has needs heavy load starting, light-load starting, No Load Start sometimes sometimes sometimes, and it loads on heavily, hockets between light, the sky or often changes when normally moving.For adapting to such load, motor generally will be by heavy-load start or heavy service requirement apolegamy, but the actual loading rate is little can cause motor underloading or no-load running so again the time, and efficient and power factor are low.

Thereby change the requirement that realizes efficient operation for satisfying the automatic matched load of dragging motor, a lot of technical schemes were once proposed both at home and abroad, for example, high slip motor, magneto, two stator motors, also there is the thyristor of employing to downgrade and presses operation, variable frequency power supply, reactive power compensator, and motor stator winding adopts Y-Δ connection etc.Tradition Y-Δ connection conversion winding changing-over complexity, the corresponding winding coil turns-in-series of two shelves of Y wherein and Δ connection ratio is confined to fixed numbers

Can not adjust, can't guarantee motor is moved by optimum Working under a lot of situations.These technical schemes or improvement in performance are little, or the cost height, or the complicated poor reliability of control transformation, can not really satisfy the needs of these mechanical devices, in fact also are difficult to apply.

The utility model content

Be to solve the above-mentioned defective that prior art exists, the purpose of this utility model is to provide a kind of starting torque big, operational efficiency and power factor height, control easy, good reliability, novel pair of power, efficient, energy-saving induction motor of Remarkable Energy Saving.

For realizing above-mentioned utility model purpose, the technical scheme that adopts is: this novel pair of power, efficient, energy-saving induction motor, comprise rotor, stator winding, it is characterized in that: described three-phase stator winding is every to be divided into three sections mutually, described three phase windings adopt Δ+Y connection or Y+Y connection, the Δ connection end of described Δ+Y connection is the terminal of corresponding high power wiring, and Y connection end is the terminal of corresponding low-power wiring; The end of the 1st wye connection of described Y+Y connection is the terminal of corresponding high power wiring, the 2nd wye connection end is the terminal of corresponding low-power wiring, and the terminal of the high power wiring of described Δ+Y connection or Y+Y connection realizes that by two contactors conversion is connected with the conversion of the terminal connections of low-power wiring.

Adopt the beneficial effect of technique scheme to be: the three-phase stator winding of this novel pair of power, efficient, energy-saving induction motor is every to be divided into three sections mutually, described three phase windings adopt Δ+Y connection or Y+Y connection, above-mentioned connection has the terminal of low-power wiring and the terminal of high power wiring, and the terminal of the high power wiring of Δ+Y connection or Y+Y connection realizes that by two contactors conversion is connected with the conversion of the terminal connections of low-power wiring.Two contactors can easyly carry out two power two retainings reliably and switch, this is big characteristics of this mode of connection, adjust two grades of each self-corresponding winding coil numbers of turn and then can conveniently obtain two grades of power division ratios, also promptly two grades of actual powers can design as required, thereby make motor load operate in optimum Working.By the AC Electrical Machine Winding correlation theory, the Δ of three phase windings+Y connection also has increase winding coefficient to weaken the effect of the harmonics of magnetic force simultaneously.Winding connect to realize that the high-low power conversion is the design philosophy that has adopted the stator winding turns-in-series " to subtract circle " capacity motor is increased, 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 conversion regime the most reliably between each power shelves like this, keep the working condition requirement of the efficient operation of motor in the time of also can adapting to the mechanical device load variations of its connection.Through the novel pair of power electric motor prototyping testing that the oil-field oil pumper developed and belt conveyor are used, its efficient improves 2-3 percentage point, and power saving rate reaches more than the 10-30%.This New-type electric machine can adapt to one or both voltages and have selectable high and low two kinds of power shelves, wherein the high power shelves have high starting torque, be used for heavy-load start or operation, starting process finishes, and visual loading condition keeps the operation of high power shelves or changing the low-power shelves over to moves.The low-power shelves can be used for zero load or light-load starting, make whole electric system can guarantee certain soft start performance automatically, New-type electric machine is matched load well, improve technical scheme with present other and compare, 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.

Description of drawings

Below in conjunction with accompanying drawing specific embodiment of the utility model is described in further detail.

Fig. 1 is the utility model stator winding connection schematic diagram.

Fig. 2 is the schematic diagram of the another kind of connection of the utility model stator winding.

Fig. 3 is Z=48, the two power motor winding coil three-phase division phase analysis charts of p=2.

Fig. 4 is Z=48, the two power winding Δs of p=2 three-phase+Y winding diagram.

Fig. 5 is Z=48, the two power winding Y+Y winding diagrams of p=2 three-phase.

Embodiment

As shown in Figure 1, 2, this novel pair of power, efficient, energy-saving induction motor comprises rotor, stator winding, and described three-phase stator winding is every to be divided into three sections mutually, i.e. AA, AY1, AY2; BA, BY1, BY2; CA, CY1, CY2.Above-mentioned three phase windings adopt Δ+Y connection or Y+Y connection, and the Δ connection end of described Δ+Y connection is the terminal of corresponding high power wiring, and Y connection end is the terminal of corresponding low-power wiring.Be that winding AA, BA, CA adopt the Δ connection, winding AY1 AY2, BY1 BY2, CY1, CY2 are serially connected in three ends of Δ connection respectively after the parallel connection, outlet terminal UH, the VH of Y connection end, WH are corresponding high power level, and outlet terminal UL, VL, WL are corresponding low power level.Winding as shown in the figure is the winding diagram of Y+Y connection, winding AA, BA, CA adopt the Y connection, after connecting respectively, winding AY1 AY2, BY1 BY2, CY1, CY2 be serially connected in three ends of Y connection, constitute the Y+Y connection, three ends of Y connection are drawn binding post UH, VH, WH respectively, the corresponding high power level of this binding post, the other end of AY2, BY2, CY2 is drawn binding post UL, VL, WL, the corresponding low power level of this binding post.Terminal UH, the VH of the high power wiring of described Δ+Y connection or Y+Y connection, WH realize that by two contactors conversion is connected with terminal UL, VL, the WL wiring conversion of low-power wiring.

With motor pole number 2p=4, groove is counted three phase windings of Z=48 below, and the conveyer load is that example specifies.

Number of poles 2p=4 as shown in Figure 3, groove is counted the Z=48 slot-number phase graph.Figure 4 shows that the three-phase groove coil allocative decision of 60 ° of facies tract windings of standard, the low-power shelves of this also corresponding New-type electric machine Y+Y connection.4 grooves that above-mentioned every phase is removed number also need insert when the low-power shelves again, the connection that the three-phase winding coil adopted and deciding.If the Y connection generally can adopt single channel series connection access way, also promptly form three-phase Y+Y connection.The division of two-way shunt slot number notes also the induced potential equilibrium problem between this two-way.At the low-power shelves also is to remove a part of coil groove number on 60 ° of facies tract windings of standard basis, and the motor load ability is increased, and is basic ideas that this paper studies thereby obtain the high power shelves.But, well-known, by AC MACHINE WINDING THEORY, be best with 60 ° of facies tract windings of standard performance in three phase windings, remove the way of some grooves number and will bring the winding performance decrease inevitably.For winding scheme shown in Figure 2, table 1 has been listed the wherein mmf harmonics analysis result that analyzes number of poles Z-p of high power shelves winding scheme.As Fig. 4,5 is 60 ° of facies tract windings of standard harmonic analysis result of corresponding low-power shelves.

Table 1 Z=48,2p=4, y=10 three phase winding the harmonics of magnetic force are analyzed

From table 1 harmonic analysis result as can be seen, when line taking circle pitch y=10, every high power shelves winding scheme of removing mutually behind 4 grooves number, winding coefficient is 0.9440, compare taller with the winding coefficient 0.9250 of 60 ° of facies tracts of standard, and magnetic potential counter-rotating component is 0, three phase winding symmetries at this moment is described, and has kept higher conductor utilance.

In addition, consider that the high power shelves are used for finishing start-up course more, therefore also must limit the just commentaries on classics high order harmonic component amplitude that turns to together with 4 utmost point first-harmonics.Harmonic analysis is the result show, presses the high power shelves winding scheme of number distribution of groove shown in Fig. 3 b, and the relative amplitude that bigger high order is just changeing harmonic wave only is 2.4449% (52 utmost point), is no more than 4%.Therefore, according to such harmonic analysis result, and judge according to winding performance general standard, adopt every phase winding of suitable " subtracting circle " technology as can be known after having lost some coils, the corresponding winding of high power shelves has still kept and the close good performance of 60 ° of facies tract windings of standard, can satisfy application requirements.As for the concrete mode of connection of winding at this moment, can be according to each phase groove shown in Figure 2 number distribution, and take all factors into consideration applicable cases and make, shown in Fig. 4,5, low-power shelves winding is 60 ° of facies tracts of standard, and 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 design the corresponding watt level of low-power shelves, just can guarantee that motor machine system is in best efficient running status.

Be it can also be seen that by Fig. 4,5 these routine low-power shelves are every 16 coils mutually, the high power shelves are every 12 coils mutually, low-power shelves and high power shelves coil number ratio are 16/12=1.33, and can be according to the designing requirement adjustment, obviously, such number of turn ratio and Y-Δ are changed number of turn ratio

Compare, more can be fit to the operating mode of motor load in most cases.For example, be 30kW if select high power shelves capacity motor, if getting the low-power shelves is 18kW, then press the induction machine design principle, turn ratio 1.33 meets the demands just, but this turn ratio is if get by Y-Δ conversion connection

Just too big, service requirement is satisfied in very difficult assurance.

By above analysis as can be known, this programme stator is the simplex winding structure, new Δ+Y/Y+Y the mode of connection that adopts can adapt to one or both different voltages, wherein Δ+the Y or the Y+Y mode of connection have guaranteed that two power shelves only need have 6 leading-out terminals, adopt two three-phase contactors to switch, control very easy to be reliable.Can find out thus, be based upon " subtracting circle " technology advanced on the AC MACHINE WINDING THEORY basis, application by time-vector method in design of Windings and computer harmonic analysis method, guaranteed that corresponding two the power shelves of winding not only have characteristics separately but also have good performance, can satisfy the operating mode demand of load fully, compare with existing other technology, the research of this programme has its unique advantage, also therefore good prospects for application can be arranged, for certain impetus is played in the energy-saving and emission-reduction and the technological progress of China in most of electric system energy-saving field.

Claims

1. novel pair of power, efficient, energy-saving induction motor, comprise rotor, stator winding, it is characterized in that: described three-phase stator winding is every to be divided into three sections mutually, described three phase windings adopt Δ+Y connection or Y+Y connection, the Δ connection end of described Δ+Y connection is the terminal of corresponding high power wiring, and Y connection end is the terminal of corresponding low-power wiring; The end of the 1Y type connection of described Y+Y connection is the terminal of corresponding high power wiring, 2Y type connection end is the terminal of corresponding low-power wiring, and the terminal of the high power wiring of described Δ+Y connection or Y+Y connection realizes that by two contactors conversion is connected with the conversion of the terminal connections of low-power wiring.