SWS-K型无刷双馈系统的优势

SWS-k型无刷双馈交流电机及智能调速系统的优势

1、SWS-k型无刷双馈交流电机(BDFM)是一种新型交流感应电机,它兼有异步电机和同步电机的共同优点，转速和功率因数可调提高了控制系统的力能指标，在调速时功率因数和效率均高于其他异步电机30-50%，使其全程运行在高功率因素状态降低线路损耗和无功功率补偿装置的投入。

2、鼠笼式电机容量的不断扩大使得变频器容量不断上升，增加了生产和维护成本。SWS-k型无刷双馈交流电机通过调速系统的功率远远小于电机功率，智能调速系统为电机的控制绕组提供“转差功率”实现对高压电机的控制；例如1000kW／10kV的高压电机只需用350kW-500kW／380V的低压智能调速系统即可，大大减少了所需的功率模块数量。

3、SWS-k型无刷双馈交流电机及智能调速系统只有小部分电能需要处理，因而谐波对电网造成污染很小、系统效率>94%高于普通电动机（因为普通电动机系统中全部电能要经过一个全容量变压器和一个全功率变频器才能达到电动机变频调速要求，这个过程中，即便变压器和变频器效率均高达98%，系统效率也只有92%左右）加上无刷双馈电动机调速系统自耗电相比全功率变频器少4-5%，因此节能效果十分明显。

4、SWS-k型无刷双馈交流电机的运行转速仅与功率绕组和控制绕组的频率及相序有关，而与负载转矩无关，因此电机具有硬的机械特性，调速范围可达0-100%、50-100%，能满足不同工况运行要求；

5、SWS-k型无刷双馈交流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。

6、目前交流调速中使用较多的是鼠笼式感应电机、绕线式感应电机、双馈电机等，但这些电机都有各自的缺点和局限性， SWS-k型无刷双馈交流电机的产生有效地解决了这些问题。

7、SWS-k型无刷双馈交流电机及智能调速系统是低压双核智能模块化设计，系统为可平滑切换的冗余型调速模式，当系统发生故障时，能自动更换模块，使电机在原状态下继续运行，而鼠笼式感应电机、绕线式感应电机、双馈电机等只能切换到工频高速运行；

8、与绕线式交流电机相比该SWS-k型无刷双馈交流电机实现了交流电机的无刷化，取消了电刷和滑环、结构上更加安全可靠，降低了运行维护费用。

因此，与其他变频器相比，“SWS-k型无刷双馈交流电机及调速系统”广泛应用于大中型水利排灌工程、水电工程、电力、风力、风机、泵类等的节能调速，替代目前由国外企业占据的中高端电机节能及变频器等产品市场具有无可比拟的优势。

The advantages of SWS-k brushless doubly-fed AC motor and intelligent speed control  system

1、SWS-k brushless doubly-fed AC motor and intelligent speed control system (BDFM) is a new generation of AC induction motor, with the common advantages of asynchronous and synchronous motors, adjustable rotation rate and power factors improved force-energy of the control system, the power factor and efficiency are 30%-50% higher than other asynchronous motors during the process of speed control. It reduces line loss in high power state and the investment of reactive power compensation devices.

2、Capacity expanding of squirrel cage motors makes the capacity increasing of inverters, which increases the costs of production and maintenance. The power that passes through the intelligent speed control system of SWS-k brushless doubly-fed AC motor is far less than the power of motor, high voltage motor is controlled by the “slip power” supplied by intelligent speed control system to the control winding of the motor. For example, the 1000kW/10kV high voltage motor simply requires 500kW/380kV low voltage speed control system, which greatly reduces the number of modules required.

3、The low voltage intelligent control system of SWS-k brushless doubly-fed AC motor and intelligent speed control system deals with only a small amount of electrical energy, which is a very small harmonic pollution for the grid. The system efficiency >94%, which is higher than ordinary electric motors (this is because all the electric energy in ordinary motors needs to go through a full capacity transformer and a full power inverter to achieve the requirement of frequency conversion and speed control. In this process, even the efficiency of transformer and inverter is up to 98%, the system efficiency is only about 92%). In addition, the self-consumption of speed control system of BDFM is 4-5% less than full-power converter, thus the energy saving is very obvious.

4、The operating speed of SWS-k brushless doubly-fed AC motor is only related to the phase sequence of the power winding and control winding, regardless to the load torque, therefore the motor has hard mechanical properties. The adjustable speed range can be 0-100%, 50-100%, it totally meets the operational requirements of different working conditions.

5、SWS-k brushless doubly-fed AC motor is using stator magnetic field--oriented vector control, the motor torque output and speed can be quickly controlled. Thus it is with a good dynamic performance.

6、Currently squirrel cage induction motors, winding induction motors and dual-fed motors are mainly used in the AC speed controlling field, but these motors have their own shortcomings and limitations, SWS-k brushless doubly-fed AC motor is an effective solution to the questions.

7、SWS-k brushless doubly-fed AC motor and intelligent speed control system assembled dual-core low voltage intelligent module, the system is redundant speed mode and can be smoothly switched. When the system fails, it can automatically switch the module to make the motor run in original state. But squirrel cage induction motors, wound induction motors and dual-fed motors and others can only switch to power frequency and run at high speed.

8、Compare with the winding AC motors, SWS-k brushless doubly-fed AC motor is the AC motor without brush and slip rings, these structures are more secure and reliable and it also reduces operation and maintenance costs.

Therefore, compared with other inverters, SWS-k brushless doubly-fed AC motor and intelligent speed control system can be widely used in energy-saving speed control for medium and large sized water irrigation and drainage works, water power works, electricity, fans, wind, pumps and some other works. It is the replacement of the products of high-end motors and inverters that occupied by the products from foreign companies with its incomparable advantages.