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電機介紹

SWS-k無刷雙饋交流電機

1.1電機概述
 

無刷雙饋交流電機具有極數不同的兩套定子繞組(功率和控制繞組),而轉子采用特殊設計的繞線式轉子結構。轉子鐵心由導磁的電工鋼片疊壓而成,在轉子鐵心上開有均勻分布的槽,轉子槽中放置齒諧波繞組,用以產生極對數p+q(定子p對極功率繞組和q對極控制繞組的極對數之和)的齒諧波磁動勢。這種齒諧波轉子繞組,每相自成閉合回路,沒有對外的引出線,不需要滑環和電刷,因此可實現無刷化。

這種無刷雙饋電機兼有感應電機和同步電機的優點,可異步運行和同步運行,并可實現低于和高于同步速的雙饋調速運行,不僅可用做各種用途的電動機,而且可作為發電機,特別是可用作交流勵磁的變速恒頻發電機。

無刷雙饋交流電機及調速系統如圖1所示,其中1為電機定子,2為轉子,3為控制器,4為交流電源。在電機定子1中的鐵心槽中放置了2套獨立的對稱繞組,分別為圖1中出線端子用A1,B1,C1 表示的功率繞組和用A2,B2,C2 表示的控制繞組。繞組的連接關系為:功率繞組的出線端子A1,B1,C1與交流電源4相連接;控制繞組的出線端子A2,B2,C2 通過控制器3,與控制電源相連接。

 

圖1無刷雙饋交流電機及調速原理

 

圖2為無刷雙饋交流電機定子繞組結構示意圖。功率繞組具有p對極,控制繞組具有q對極,功率繞組和控制繞組的極數不能相等,而且需滿足下述關系:p+q=偶數。具有不同極數的定子控制繞組與功率繞組之間,不能直接進行電磁耦合和能量傳輸,需要通過轉子的磁場媒介作用,方可實現電機的機電能量轉換。功率繞組的作用是從電網直接傳輸電能,而控制繞組的作用除了傳輸電能之外,還控制電機的運行狀態和參數。無刷雙饋交流電機樣機如圖3。

 

圖2  無刷雙饋交流電機定子繞組結構示意圖

 

圖3無刷雙饋交流電機【功率范圍6(10) Kv-200kW-12500kW】安裝尺寸與國家交流異步電動機標準一致Fig. 3: The prototype of BDFM【power range 6(10) Kv-200kW -12500kW】

 

 

1.2電機特點

1)結構上實現無刷可靠;
2)具有繞線式異步電機和電勵磁同步電機的所有優點和功能;
3)可以實現異步電機、同步電機和雙饋變頻調速電機等多種運行方式;
4)采用場路結合有限元計算和優化計算方法,開發無刷雙饋調速電機的電磁設計優化程序,為電機設計的可靠性提供了保證。

 

1.3新型電機與傳統的交流電機相比(包括異步電機和同步電機)的優點

1)與普通繞線轉子電機比較,該新型電機實現了交流電機的無刷化。由于電機轉子采用了不需引向外部電路的特殊結構,所以電機無滑環和電刷、結構上更加安全可靠、減少維護、降低了維護和運行費用;
2)容易加工制造,電機更耐用;
3)可方便地實現多種運行方式。通過改變兩個定子繞組的供電方式,可以像繞線式感應電機一樣,實現電機的軟起動、異步運行、同步運行、串級調速和雙饋調速等多種運行方式;
4)當作為變頻調速電機應用于電氣傳動系統時,只需使用低壓調速系統為電機的控制繞組提供“轉差功率”就可以控制高壓電機了,因此可降低所需調速器的容量;
5)新型電機轉速與負載轉矩無關,只與功率繞組和控制繞組的頻率和相序有關,具有硬的機械特性;
6)功率繞組功率因數可調,可使其運行在高功率因數,從而減小用戶無功補償的投入,降低成本;
7)新型電機采用定子磁場定向矢量控制,可以快速控制電機輸出扭矩和轉速,具有良好動態性能;
8)新型電機應用在變速恒頻風力發電系統中,可大大提高風力發電系統運行可靠性,而不影響變速恒頻控制性能。

 

The SWS-k BDFM
1.1 Outline

The BDFM is with 2 different sets of stator windings (power and control winding) with different poles, and the rotor is with a special designed structure of coil wound rotor. The rotor core is composed of pressured magnetic electrical steel sheet, with uniformly distributed slots on the rotor; the slots are placed with tooth harmonic winding to generate the tooth harmonic magnetic motive force of the pole number p + q (the sum of pole number of stator p to the pole power winding and q to the pole control winding). This tooth harmonic rotor winding, each phase forms a closed loop, no external lead wire, no slip ring and brush needed, so it is brush free.
This brushless doubly-fed motor combines the advantages of both induction and synchronous motors, it can operate asynchronously and synchronously, it can also operate in doubly-fed variable speed (below and above synchronous speed). Not only the BDFM can be used as the motor for various purpose, but also as a generator, especially used as AC excited variable speed constant frequency (VSCF) generator.
BDFM and speed control system is shown in Figure 1: 1 is stator, 2 is rotor, 3 is controller and 4 is AC supply. 2 independent symmetrical windings are placed in the iron core slot of the motor stator 1, the outlet terminals A1, B1 and C1 represent the power winding and A2, B2 and C2 represent control winding. The connections of the windings are: the outlet terminals A1, B1 and C1 of the power winding are connected to an AC power source 4; through the controller 3, the outlet terminals A2, B2 and C2 are connected to the power supply control.

 

Fig. 1: BDFM and speed control theory


Fig. 2 is the diagram of the structure of stator winding of BDFM. The power winding is with p pole, control winding is with q pole, the number of power winding and control winding can not be equal and meet the following relationship: p + q = even. Between the stator control winding an power winding with different pole number, electromagnetic coupling and energy transfer can not be carried out, the electromechanical energy conversion of the motor can be carried out through the action of the magnetic field of the rotor. The role of the power winding is the direct transmission of the power from the grid, in addition to the transmission of the power, the control winding also controls the running state and parameters of the motor. The prototype of BDFM is shown in Fig. 3

 

Fig. 2: The structure diagram of the stator winding of BDFM

 

1.2 Features:
1)Brushless structure, reliable.
2)Combines all the advantages and functions of both induction and synchronous motors.
3)It has multiple operation modes such as the operation modes of asynchronous motors, synchronous motors and doubly-fed inverter motors, etc.
4)It adopted field-circuit combination with the finite element calculation and optimization calculation methods, also developed electromagnetic design optimization program of the brushless doubly-fed speed control motor to provide a guarantee of reliability.

 

1.3 Advantages of new motors compared to traditional AC motors (including asynchronous and synchronous motors).
1)Compare with traditional rotor motors, new motor is brushless. Due to the special design of lacking connection of external circuit, no slip rings and brush. The structure is safer and more reliable, and it reduced maintenance costs and operation costs.
2)Easy to manufacture, the motor is more durable.
3)Can be easily operated in multiple modes. By changing the power supply of 2 stator windings, it can be operated like wound induction motors: soft start, asynchronous operation, asynchronous operation, cascade speed control, doubly-fed speed control and other operation modes.
4)When it is used as frequency conversion motors that applied to electric drive system, simply using low voltage frequency conversion system to provide ‘slip power’ to the control winding of the motor to control high voltage motor. Thus, it reduces the capacity of the inverter.
5)The speed of new motor is independent of the load torque, it is only related to power winding and the control winding’s frequency and orders, so the new motor has hard mechanical properties.
6)The power factor is adjustable, the motor can be operating in a high power factor, thus it reduces the investment of the reactive power compensation devices, as well as reduces the costs.
7)The new motor is with stator magnetic field orients vector control, the output of the torque and speed can be quickly controlled with good dynamic performance.
8)The application of BDFM to the VSCF wind power generation system can greatly improve the reliability of the generation system without affecting the controlling performance of VSCF.

公司:上水能源科技有限公司
(北京)地址:北京市海淀區大柳樹富海中心2號樓1503室
(廣州)地址:廣州市高新技術產業開發區科學城科珠路201號G棟315室

(河北)地址:滄州市運河區天昕大廈B1603室
電話:+86-010-51293199 +86-020-32068288 +86-0317-5207833
郵箱:[email protected]
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排列三开奖视频