CN202798397U

CN202798397U - Winding wiring inner compensation asynchronous motor

Info

Publication number: CN202798397U
Application number: CN 201220440645
Authority: CN
Inventors: 刘涛; 刘耀; 刘建平
Original assignee: 刘建平
Priority date: 2012-08-31
Filing date: 2012-08-31
Publication date: 2013-03-13
Anticipated expiration: 2022-08-31

Abstract

The utility model relates to a winding wiring inner compensation asynchronous motor. A stator of the motor comprises main windings and auxiliary windings with identical turns. The main windings of each phase are connected in parallel in identical head end direction. Auxiliary windings of each phase are connected in series in identical head end direction, or connected in series or connected first in series with two as one group and then in parallel. An A1 wiring end in parallel connection is led out from the head end of an A-phase main winding, an A2 wiring end is led out by connecting the tail end of the A-phase main winding with the tail end of a C-phase auxiliary winding. A B1 wiring end in parallel connection is led out from the head end of a B-phase main winding, and a B2 wiring end is led out by connecting the tail end of the B-phase main winding and the tail end of the combined A-phase auxiliary winding. A C1 wiring end in parallel connection is led out from the head end of a C-phase main winding, and a C2 wiring end is led out by connecting the tail end of the C-phase main winding with the tail end of the combined B-phase auxiliary winding. The main wiring end A1, the main wiring end B1, the main wiring end C1, the auxiliary wiring end A2, the auxiliary wiring end B2 and the auxiliary wiring end C2 are divided into two groups. One group is connected with an alternating current switch K1 to be connected with a three-phase alternating current power supply, and the other group is connected with a three-phase capacitor group. The motor has the advantages of being small in reactive loss, simple in external wiring, high in reliability and the like.

Description

Compensation asynchronous motor in a kind of zigzag connection

Technical field

The utility model belongs to machine field, is specifically related to compensation asynchronous motor in a kind of zigzag connection.

Background technology

Existing technology has the reactive-load compensation method of asynchronous motor: carry out so-called local compensation at Motor Control Kui next door installing capacitor in parallel; Adopting the patent No. is that the Chinese patent of 01228605.2 Double-winding capacitance internal compansation motor carries out its internal compensation.Two groups and the equal threephase stator winding of umber of turn are on the same group adopted in this interior compensation method, the former limit of its three-phase winding is connected into triangle or star-star connection, the secondary winding divides other end to connect with power end, and the other end connects with three-phase condenser bank with the single-phase electricity container respectively, or its former and deputy limit three phase windings to be connected into its potential phasor be orthohexagonal wiring, and carry out interior compensation with single-phase with the three-phase capacitor combination.This interior compensation method has the advantage that reduces reactive current and loss thereof with the characteristics that condenser current can directly extend in the motor winding, but it lays particular emphasis on the way of using the single-phase electricity container and is not easy to utilize three-phase condenser bank, its former limit winding of existing commercial Application to be connected in power supply and the wiring of secondary winding connection capacitor, make it when capacitor disconnects, can't under heavy duty, guarantee the normal operation of motor, secondly when the motor antiport, its wiring will make two groups of electric current phasors in the winding produce larger phase place and the imbalance of magnetic potential.

The purpose of this utility model is to bias toward capacitor and the external cabling complexity of using single-phase or phase voltage value for compensation technique in the large and existing electric capacity of the reactive loss of above-mentioned asynchronous motor, and it is difficult to normal operation and the lower problem of reliability thereof when heavy duty after disconnecting capacitor, and compensation asynchronous motor in a kind of zigzag connection is provided.

The utility model realizes that the technical scheme that above-mentioned purpose adopts is: compensation asynchronous motor in a kind of zigzag connection, comprise stator core, threephase stator winding, rotor core, rotor winding, alternating-current switch and capacitor, its threephase stator winding is every the main winding of 2～6 identical numbers of turn and the auxiliary winding of 2～6 identical numbers of turn mutually, the number of turn ratio of main winding and auxiliary winding is respectively 1:1～2, and the main winding of homophase does not directly connect with auxiliary winding; 2～6 main windings of every phase carry out parallel connection with identical head end direction, 2～6 auxiliary winding of every phase connect with identical head end direction or in parallel or in twos series connection after carry out again combination in parallel; The head end of A phase main winding in parallel is drawn the A1 terminals, the end of its terminal C phase auxiliary winding with making up links and draws the A2 terminals, the head end of B phase main winding in parallel is drawn the B1 terminals, the end of its terminal A phase auxiliary winding with making up links and draws the B2 terminals, the head end of C phase main winding in parallel is drawn the C1 terminals, and the end of its terminal B phase auxiliary winding with making up links and draws the C2 end; According to the 60 degree electromotive force angular way that lag behind successively, it is the parallel inequilateral hexagon of opposite side that integral body is connected into its potential phasor, wherein one group of its main electrical scheme end A1, B1, C1 and secondary terminals A2, B2, C2 two winding line ends is connected in alternating-current switch K1 and the three-phase alternating-current supply that arrives, and another group connects two groups of three-phase condenser banks.

Power average when the total capacity of described two groups of three-phase condenser bank C01, C02, C03 and C04, C05, C06 and threephase asynchronous operation is the numerical value ratio of 0.4～0.7:1, and the Capacity Ratio of the former with the latter is 1:0.5～1; Described three-phase condenser bank be divided into two groups and will be wherein one group of synchronous and asynchronous electronic winding line end directly connect, another group capacitor connects through three bidirectional thyristor T1, T2, T3 or three-phase alternating-current switch K2 again.

Described main electrical scheme end A1, B1, C1 connect with three alternating current sources of A, B, the C of positive phase sequence and carry out being rotated in the forward of asynchronous motor through alternating-current switch successively, or with A2, the C2 of secondary terminals, B2 through alternating-current switch be connected to A, B, three power ends of C carry out its reverse rotation.

Compared with prior art, the utility model adopts the zigzag connection of inequilateral hexagon for using existing inside to carry out the interior compensation condition of providing convenience as the low voltage power capacitor of delta connection, and with the principle of equivalent parallel in the excitatory induction reactance of motor two ends, has many-sided energy-saving effect to reducing stator leakage reactance pressure drop, the magnetic hysteresis loss of magnetic circuit and the reactive loss of circuit, especially reach energy-saving horizontal more than 20% with reducing motor operating current under the even load, the simplification of its enforcement is carried out reducing energy consumption to numerous asynchronous motors and is had widely economic worth; The characteristics of utilizing its zigzag connection and capacitor to be connected in terminals can significantly reduce the starting current of asynchronous motor, especially when multiple asynchronous motors shares the start capapcitor of one group of larger capacity, can make cage type asynchronous motor have the less advantage of electric current than wire wound asynchronous motor; Switching by two winding line ends can just carried out motor, the control of antiport, and can when antiport, keep the balance of winding magnetic potential; Utilize winding all to be connected in the characteristics in loop, it also can be made when capacitor disconnects under 70% nominal load, guarantee stable operation and have higher reliability; When three bidirectional thyristors adopt phase-shift trigger unit control, can make compensation maintenance optimum state in it with the corresponding control capacittance electric current of load variations.

Description of drawings

Fig. 1 is compensation asynchronous motor elementary diagram in the utility model embodiment 1 zigzag connection;

Fig. 2 is compensation asynchronous motor elementary diagram in the utility model embodiment 2 zigzag connections;

Fig. 3 is compensation asynchronous motor elementary diagram in the utility model embodiment 3 zigzag connections;

Embodiment

Embodiment 1

As shown in Figure 1: adopt the original stator core of three-phase low-voltage asynchronous motor Y-series to undergo technological transformation, its stator slot is 36, coil configuration be double-layer overlapped around, pitch 8(1-9), number of poles 4, the turn ratio of the main winding and auxiliary winding of three-phase is respectively 1:1, and conductor cross-section is than 1:1, and 4 utmost point phase components of the identical number of turn of every phase directly do not connect with 2 auxiliary winding as 2 main windings; Number as mark, an end that adds "●" at winding is as its head end take the groove that is positioned at the upper strata wire casing for each coil groups (utmost point is organized mutually), and the other end is terminal; Coil is numbered 1,2,3 and 19,20,21 two utmost points that form and organizes mutually as WA1 and two A phases of WA2 main winding, and 10,11,12 and 28,29,30 two utmost points that form are organized mutually as Wa1 and two A phases of Wa2 auxiliary winding; WB1 and WB2, WC1 and WC2 postpone successively 6 wire casings and discharge, and Wb1 and Wb2, Wc1 and Wc2 discharge than Wa1 and Wa2 6 wire casings that lag behind successively equally; The main winding WA1 of three-phase respectively carries out in parallel with Wc2 with identical head end direction with WB2, Wc1 with WA2, WB1, Wa1 and Wa2 with identical head end direction series connection after again the end of the B phase main winding that it is terminal and in parallel link and draw B2 and hold, again its terminal and C are in parallel after with the identical head end direction series connection end of main winding of Wb1 and Wb2 links and draws the C2 end, and again its terminal and A are in parallel after with the identical head end direction series connection end of main winding of Wc1 and Wc2 links and draws A2 and hold; A main winding and B auxiliary winding, B main winding and C auxiliary winding, C main winding and the A auxiliary winding that is in series that is in parallel that is in series that is in parallel that is in series that is in parallel divides other two head ends to link and draws A1, B1, three main electrical scheme ends of C1, and through alternating-current switch K1 and three alternating current sources of A, B, C of the positive phase sequence that arrives, A2, B2, three secondary terminals of C2 directly connect with the power capacitor of C01, C02, C03 delta connection, and connect with C04, C05, C06 capacitor group through T1, T2, three KS types of T3 bidirectional thyristor.

The mean value of running current is selected in the ratio of 0.4:1 under the current value of C01, C02, C03 three-phase condenser bank and the asynchronous motor actual loading, the capability value of the capacitor of C04, C05, C06 is selected by the former 1/2, and the design of asynchronous motor umber of turn can improve than conventional design the potential value of winding; Phasor at capacitance current is folded as follows, three main windings in parallel and the auxiliary winding of connecting consist of respectively the electric current of branch road will be from initial 1:1 and close to the ratio of 2:1, the former electric current phasor is also spent electrical degrees than the latter close to leading 60, the power factor of system is close to 1.0, and the running current of motor (effective value) reduces more than 20%.

Embodiment 2

As shown in Figure 2: the number of poles of present embodiment Y-series threephase asynchronous is 6, the turn ratio of the main winding and auxiliary winding of three-phase is respectively 1:2, corresponding conductor cross-section ratio is 2:1,6 utmost point phase components of every phase directly do not connect as between 3 main windings and 3 auxiliary winding and the main winding and auxiliary winding, and each coil groups (utmost point is organized mutually) three-phase symmetrical is routinely arranged with the principle that lags behind successively; A phase main winding WA1, WA2, WA3, B phase main winding WB1, WB2, WB3, C phase main winding WC1, WC2, WC3 carry out parallel connection with the identical number of turn and identical head end direction respectively, A phase auxiliary winding Wa1, Wa2, Wa3, B phase auxiliary winding Wb1, Wb2, Wb3, C phase auxiliary winding Wc1, Wc2, Wc3 also carry out parallel connection with the identical number of turn and identical head end direction respectively; According to A main winding and C auxiliary winding, B main winding and the A auxiliary winding that is in parallel that is in parallel that is in parallel that is in parallel, C main winding and the B auxiliary winding that is in parallel that is in parallel divides other end mode of linking to connect and draws successively A2, B2,3 secondary terminals of C2, and again A is in parallel main winding and B auxiliary winding, B main winding and C auxiliary winding, C main winding and the A auxiliary winding that is in parallel that is in parallel that is in parallel that is in parallel that is in parallel connects in the head end mode of linking respectively and draws successively A1, B1, three main electrical scheme ends of C1; The main electrical scheme end is attached to three alternating current sources of A, B, C of positive phase sequence through alternating-current switch K1, secondary terminals A2, B2, C2 directly connect with C01, C02, C03 capacitor group, and connect with C04, C05, C06 capacitor group through T1, T2, three bidirectional thyristors of T3.

Claim phase.

The capability value of C01, C02, C03 and C04, C05, two groups of three-phase condenser banks of C06 and the performance number of threephase asynchronous actual motion are chosen as the ratio of 0.6:1, and the capacity ratio of two group capacitors is 1:1.The auxiliary winding of the three characteristics of the middle term also is parallel connection, and its number of turn is 2 times of the main winding number of turn, and compensates the corresponding increase umber of turn of palpus under the internal factor that can improve excitatory impedance potential value in electric capacity; Drop into current effective value in the corresponding reduction of running current, each phase main winding and auxiliary winding of capacitor rear motor also with close to the ratio of 2:1 so that the magnetic potential in 18 windings close to balance; When A2, C2, three secondary terminals of B2 connect the alternating current source of mutual A, B, C three-phase positive phase sequence through alternating-current switch K1 correspondence, asynchronous motor changes antiport over to, and its A1, B1, three main electrical scheme ends of C1 connect the interior compensation that two groups of three-phase capacitors still can carry out balance.

Embodiment 3

As shown in Figure 3: adopt the asynchronous motor matrix of JR type three-phase wound-rotor 12 utmost points to carry out the design of compensation asynchronous motor in the zigzag connection, the frequency sensitive trheostat of its wound rotor and alternating-current switch cancellation, from the leading-out terminal short circuit, utilize start capapcitor to carry out the heavy-load start of motor three-phase rotor winding; The turn ratio of the main winding and auxiliary winding of three-phase is respectively 1:1, it is identical and respectively as 6 main windings and 6 auxiliary winding that 12 utmost points of every phase are organized the number of turn mutually, main winding and auxiliary winding is not directly carried out mutual connection, and circle groups at different levels (utmost point is organized mutually) stack with certain electrical degree that lags behind successively by three-phase symmetrical and arrange; A phase main winding WA1, WA2, WA3, WA4, WA5, WA6; B phase main winding WB1, WB2, WB3, WB4, WB5, WB6, C phase main winding WC1, WC2, WC3, WC4, WC5, WC6 with identical head end direction be formed in parallel respectively the three-phase main winding and tie, A phase auxiliary winding Wa1, Wa2, Wa3, Wa4, Wa5, Wa6, B phase auxiliary winding Wb1, Wb2, Wb3, Wb4, Wb5, Wb6, C phase auxiliary winding Wc1, Wc2, Wc3, Wc4, Wc5, Wc6 are connected into the three-phase auxiliary winding combination wiring that again three branch roads is formed in parallel of a branch road in twos; According to A be in parallel main winding and the combined auxiliary winding of C, B be in parallel main winding and the combined auxiliary winding of A, the C main winding that is in parallel connects in twos in the end mode that links respectively with the combined auxiliary winding of B and draws successively A2, B2, three secondary terminals of C2, the combined auxiliary winding of main winding and B that again A is in parallel, B be in parallel main winding and the combined auxiliary winding of C, C be in parallel main winding and the combined auxiliary winding of A respectively with head end in twos connecting mode link and draw successively A1, B1, three main electrical scheme ends of C1; The main electrical scheme end is attached to three power ends of A, B, C of positive phase sequence through alternating-current switch K1, and secondary terminals A2, B2, C2 not only connect with C01, C02, C03 three-phase condenser bank, also connect with C04, C05, C06 three-phase condenser bank through the K2 alternating-current switch.

With the two ratio of the performance number of the capability value of the direct coupled C01 of secondary terminals, C02, C03 three-phase operation capacitor group and threephase asynchronous actual motion be 0.7:1, C04, the C05, the C06 that connect through the K2 alternating-current switch are chosen as 1-3:1 for the capability value of the three-phase capacitor of starting and the capability value ratio of three-phase operation capacitor, and start capapcitor can share by multiple electric motors.The inequilateral hexagon stator winding of this zigzag connection, total (also, the series connection) number of turn ratio of its main winding and auxiliary winding is 1:2, the main electrical scheme end of the induced voltage phasor relative proximity of each secondary terminals 38-40 degree voltage phase angles that lag behind; The capacitance current of the three-phase capacitor that connects at secondary terminals carries out phasor splicing to the electric current of perception respectively, and with the resultant current phasor in each main winding in parallel to leading direction close to shifting 30 degree, and the resultant current phasor in the combination auxiliary winding is backward close to the rule that shifts 30 degree, so that the two resultant current phasor of the main winding and auxiliary winding of homophase levels off to phase place in out of phase connection consistent consistent with magnetomotive force numerical value, thereby at the wander reactive loss of middle reduction asynchronous motor of the inner wheel of perception and two kinds of energy of capacitive.

Operation principle of the present utility model is: adopt respectively main winding in parallel the stator winding of threephase asynchronous, its auxiliary winding combination connects, and differ successively 60 degree electrical degrees according to its potential phasor and carry out complications connections, not only the interior compensation take the characteristics of its two windings line end as capacitor provides precondition, also makes it still can produce stable rotating magnetic field when not dropping into capacitor and can drive certain load in the symmetry of the symmetrical and magnetic potential of stator slot with its three phase winding; At A2 than A1, B2 is than B1, C2 lags behind respectively 38～40 when spending than the voltage phasor of C1, be connected in three of secondary terminals or six capacitors and will carry out respectively the stack of capacitance current to inductance current original in each winding, for example the inductance current that lays particular emphasis on the A phase main winding of parallel connection of the capacitance current phasor of C01 carries out phasor splicing and its composite phasor is shifted to leading direction, and the C phase auxiliary winding that the capacitance current of C03 lays particular emphasis on combination carries out phasor splicing and its composite phasor is shifted to the hysteresis direction, when the capacity of capacitor be chosen as during in same electric pressure the motor operation performance number 1/ And be 1/2 o'clock of combination auxiliary winding at the inductive voltage value of main winding in parallel, the resultant current phasor that then can make main winding in parallel make up auxiliary winding is 2 times of the latter close to leading 60 degree electrical degrees and the former current values, thereby makes both magnetic potential phase numerical quantities equate and differ 60 to spend electrical degrees; It all is in parallel why selecting main winding, the inductance current that auxiliary winding is based on conventional asynchronous motor winding in service for series connection or combination connect lags behind than voltage phasor, and 30～40 degree electrical degrees consider, when this lags behind than power end (main electrical scheme end) at compensation end (secondary terminals), be ahead of inductance current phasor in the main winding and close to the C01 capacitance currents of 90 degree its resultant current phasor shifted and numerical value increases to leading direction, shift and make its numerical value be the former 1/2 to the hysteresis direction and to lag behind the C01 capacitance current be the capacitance current of the C03 of the 120 degree resultant current phasor that will make auxiliary winding; Zigzag connection method with six terminals, because the auxiliary winding total number of turns is the main winding total number of turns close to 2 times and potential value also close to 2 times winding construction, only has and utilize capacitance current to carry out respectively phasor splicing could to increase to than auxiliary winding in the current values of main winding that could to form the magnetomotive force phasor when spending close to 2 times of values and leading 60 be compensation effect in orthohexagonal the best; The condenser current phasor produces under the rotational voltage of motor winding and transformer EMF comprehensive function respectively and carries out the distribution of electric current.

Claims

1. compensate asynchronous motor in a zigzag connection, comprise stator core, threephase stator winding, rotor core, rotor winding, alternating-current switch and capacitor, it is characterized in that: the threephase stator winding is every the main winding of 2～6 identical numbers of turn and the auxiliary winding of 2～6 identical numbers of turn mutually, the number of turn ratio of main winding and auxiliary winding is respectively 1:1～2, and the main winding of homophase does not directly connect with auxiliary winding; 2～6 main windings of every phase carry out parallel connection with identical head end direction, 2～6 auxiliary winding of every phase connect with identical head end direction or in parallel or in twos series connection after carry out again combination in parallel; The head end of A phase main winding in parallel is drawn the A1 terminals, the end of its terminal C phase auxiliary winding with making up links and draws the A2 terminals, the head end of B phase main winding in parallel is drawn the B1 terminals, the end of its terminal A phase auxiliary winding with making up links and draws the B2 terminals, the head end of C phase main winding in parallel is drawn the C1 terminals, and the end of its terminal B phase auxiliary winding with making up links and draws the C2 end; According to the 60 degree electromotive force angular way that lag behind successively, it is the parallel inequilateral hexagon of opposite side that integral body is connected into its potential phasor, wherein one group of its main electrical scheme end A1, B1, C1 and secondary terminals A2, B2, C2 two winding line ends is connected in alternating-current switch K1 and the three-phase alternating-current supply that arrives, and another group connects two groups of three-phase condenser banks.

2. compensate asynchronous motor in a kind of zigzag connection according to claim 1, it is characterized in that: power average when the total capacity of described two groups of three-phase condenser bank C01, C02, C03 and C04, C05, C06 and threephase asynchronous operation is the numerical value ratio of 0.4～0.7:1, and the Capacity Ratio of the former with the latter is 1:0.5～1; Described three-phase condenser bank be divided into two groups and will be wherein one group of synchronous and asynchronous electronic winding line end directly connect, another group capacitor connects through three bidirectional thyristor T1, T2, T3 or three-phase alternating-current switch K2 again.

3. compensate asynchronous motor in a kind of zigzag connection according to claim 1, it is characterized in that: described main electrical scheme end A1, B1, C1 connect with three alternating current sources of A, B, the C of positive phase sequence and carry out being rotated in the forward of asynchronous motor through alternating-current switch successively, or with A2, the C2 of secondary terminals, B2 through alternating-current switch be connected to A, B, three power ends of C carry out its reverse rotation.