欢迎来到上水能源科技有限公司官方网站!

咨询热线
+86-010-51293199
+86-020-32068288

+86-0317-5207833

  •  
关键字:
研发与生产
联系信息

(北京)地址:
北京市海淀区大柳树富海中心2号楼1503室
(广东)地址:
广州市高新技术产业开发区科学城科珠路201号G栋315室
(河北)地址:

总部:沧州市运河区天昕大厦B1603室

生产基地:沧州市高新区激光产业园

电话:
+86-010-51293199
+86-020-32068288

+86-0317-5207833
邮箱:info@rockyss.com

您现在的位置:电机介绍
电机介绍

SWS-k无刷双馈交流电机

1.1电机概述
 

无刷双馈交流电机具有极数不同的两套定子绕组(功率和控制绕组),而转子采用特殊设计的绕线式转子结构。转子铁心由导磁的电工钢片叠压而成,在转子铁心上开有均匀分布的槽,转子槽中放置齿谐波绕组,用以产生极对数p+q(定子p对极功率绕组和q对极控制绕组的极对数之和)的齿谐波磁动势。这种齿谐波转子绕组,每相自成闭合回路,没有对外的引出线,不需要滑环和电刷,因此可实现无刷化。

这种无刷双馈电机兼有感应电机和同步电机的优点,可异步运行和同步运行,并可实现低于和高于同步速的双馈调速运行,不仅可用做各种用途的电动机,而且可作为发电机,特别是可用作交流励磁的变速恒频发电机。

无刷双馈交流电机及调速系统如图1所示,其中1为电机定子,2为转子,3为控制器,4为交流电源。在电机定子1中的铁心槽中放置了2套独立的对称绕组,分别为图1中出线端子用A1,B1,C1 表示的功率绕组和用A2,B2,C2 表示的控制绕组。绕组的连接关系为:功率绕组的出线端子A1,B1,C1与交流电源4相连接;控制绕组的出线端子A2,B2,C2 通过控制器3,与控制电源相连接。

 

图1无刷双馈交流电机及调速原理

 

图2为无刷双馈交流电机定子绕组结构示意图。功率绕组具有p对极,控制绕组具有q对极,功率绕组和控制绕组的极数不能相等,而且需满足下述关系:p+q=偶数。具有不同极数的定子控制绕组与功率绕组之间,不能直接进行电磁耦合和能量传输,需要通过转子的磁场媒介作用,方可实现电机的机电能量转换。功率绕组的作用是从电网直接传输电能,而控制绕组的作用除了传输电能之外,还控制电机的运行状态和参数。无刷双馈交流电机样机如图3。

 

图2  无刷双馈交流电机定子绕组结构示意图

 

图3无刷双馈交流电机【功率范围6(10) Kv-200kW-12500kW】安装尺寸与国家交流异步电动机标准一致Fig. 3: The prototype of BDFM【power range 6(10) Kv-200kW -12500kW】

 

 

1.2电机特点

1)结构上实现无刷可靠;
2)具有绕线式异步电机和电励磁同步电机的所有优点和功能;
3)可以实现异步电机、同步电机和双馈变频调速电机等多种运行方式;
4)采用场路结合有限元计算和优化计算方法,开发无刷双馈调速电机的电磁设计优化程序,为电机设计的可靠性提供了保证。

 

1.3新型电机与传统的交流电机相比(包括异步电机和同步电机)的优点

1)与普通绕线转子电机比较,该新型电机实现了交流电机的无刷化。由于电机转子采用了不需引向外部电路的特殊结构,所以电机无滑环和电刷、结构上更加安全可靠、减少维护、降低了维护和运行费用;
2)容易加工制造,电机更耐用;
3)可方便地实现多种运行方式。通过改变两个定子绕组的供电方式,可以像绕线式感应电机一样,实现电机的软起动、异步运行、同步运行、串级调速和双馈调速等多种运行方式;
4)当作为变频调速电机应用于电气传动系统时,只需使用低压调速系统为电机的控制绕组提供“转差功率”就可以控制高压电机了,因此可降低所需调速器的容量;
5)新型电机转速与负载转矩无关,只与功率绕组和控制绕组的频率和相序有关,具有硬的机械特性;
6)功率绕组功率因数可调,可使其运行在高功率因数,从而减小用户无功补偿的投入,降低成本;
7)新型电机采用定子磁场定向矢量控制,可以快速控制电机输出扭矩和转速,具有良好动态性能;
8)新型电机应用在变速恒频风力发电系统中,可大大提高风力发电系统运行可靠性,而不影响变速恒频控制性能。

 

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:北京市海淀区大柳树富海中心2号楼1503室
(广州)地址:广州市高新技术产业开发区科学城科珠路201号G栋315室

(河北)地址:沧州市运河区天昕大厦B1603室
电话:+86-010-51293199 +86-020-32068288 +86-0317-5207833
邮箱:info@rockyss.com
广州上水能源有限公司版权所有 备案号: 粤ICP备1123456789号 中企动力提供网站建设