Study on the Soft Starting and Saving Energy Technology for Three Phases Induction Motor; It can improve the power factor of the motor when it is under low load or no load running. 三相感应电动机软起动及节能运行技术的研究能提高电动机在轻载或空载时的功率因素。
In addition, the application of this technology was proposed in this paper and the operation and test result shows that the technology can meet the requirement of oil saving during the periods of boiler starting, stopping, stable combustion under low load for the lignite-fired units. 同时介绍该技术应用中的运行与试验情况,从运行与试验结果来看,该技术可完全满足褐煤风扇磨煤机直吹式制粉系统锅炉启停及低负荷稳燃过程中节约大量燃油的要求。
In order to restrain the fluctuation of speed, vibraton, and increase the ability of starting under load, a copper sleeve was mounted outside the permanent magnet rotor of U-shape single phase line-start permanent magnet motor. 为了抑制转速波动、降低振动,同时提高电机带载起动能力,在原单相自起动永磁同步电机转子外侧加了铜皮套筒。
The experiments prove that the proposed closed loop control method can avoid current oscillation during soft starting, and energy saving operation of the motor under light load can be realized by using the displacement angle detection in real time. 实验证明,该闭环控制方法有效地解决了电机软起动过程中的电流震荡问题。同时,利用实时检测到的功率因数角信息,可以实现电机的轻载节能运行功能。
On the other hand, the forced commutated thyristor has starting problem under heavy load, and the larger the inverter power is, the more difficult to start, so its tonnage is small. 但是,由于采用强迫换流方式,它在重负载下存在启动困难,且随着中频功率的增大而加剧,使其不能做大。
The characteristic of cranes is frequently starting under the heavy load, while mostly running under the light load; the rate of average load is low. 起重机频繁且重载起动,多数轻载运行,平均负载率低。