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| 1 | Extracting DC bus current information for optimal phase correction and current ripple in sensorless brushless DC motor drive显示文摘Brushless DC motor(BLDCM) sensorless driving technology is becoming increasingly established. However, optimal phase correction still relies on complex calculations or algorithms. In finding the correct commutation point, the problem of phase lag is introduced. In this paper, we extract DC bus current information for auto-calibrating the phase shift to obtain the correct commutation point and optimize the control of BLDC sensorless driving. As we capture only DC bus current information, the original shunt resistor is used in the BLDCM driver and there is no need to add further current sensor components. Software processing using only simple arithmetic operations successfully accomplishes the phase correction. Experimental results show that the proposed method can operate accurately and stably at low or high speed, with light or heavy load, and is suitable for practical applications. This approach will not increase cost but will achieve the best performance/cost ratio and meet market expectations. | Zu-sheng HO Chii-maw UANG Ping-chieh WANG | 2014 | Journal of Zhejiang University-Science C(Computers and Electronics)2014，15，4： | 3 |
| 2 | 基于MCSA的离心泵转速测量与试验研究显示文摘阐述了传统离心泵转速测量方法及其存在的问题,提出了基于电动机电流信号分析(MCSA)测量离心泵转速的方法,应用信号处理理论,对方法的原理进行了数学推导.应用驱动电动机通电后定子绕组中存在与转子频率相同电流的原理,利用MCSA方法,分析电动机定子电流信号成分,从定子电流频谱中检测出转子频率.根据方法的原理设计了验证试验,试验过程中,变频器产生不同频率的电源为电动机供电,调节离心泵的流量,运用霍尔元件和数据采集卡,采集离心泵驱动电动机在不同流量下的定子电流信号,信号经过解调和快速傅里叶变换(FFT),在限定的转频范围,从电流频谱中得到转频.为了验证方法的准确性,用动静干涉机理测速法和光学测速法进行了对比试验,试验结果表明:与光学测速以及动静干涉机理测速相比,基于MCSA的转速测量方案的误差均在2%以内,满足离心泵状态监测的要求,实现了离心泵转速的无传感器测量,精度较高,适用性强.研究结果具有一定的应用价值. | 石洋 袁建平 骆寅 周帮伦 孙慧 | 2017 | 排灌机械工程学报2017，35，11： | 2 |
| 3 | 基于自适应DRNN的无刷直流电机控制方法研究显示文摘针对无刷直流电机速度控制存在高度非线性特性,提出了基于自适应DRNN(diagonal re-current neural network)的'前馈+反馈'控制方法。反馈控制器以目标转速与实际转速的误差为输入量,采用PI控制来提高控制系统的稳定性。前馈控制器采用DRNN,以反馈控制器的输出作为性能误差进行自适应控制,以提高控制系统的瞬态响应性能。仿真和实验结果表明:该控制系统能较好地跟踪目标转速,在突变负载扰动下,能有效地改善相电流波形,降低电机电磁转矩脉动,而且该控制系统具有较强的鲁棒性。 | 王立标 李军 范剑 李绣峰 | 2011 | 中国机械工程2011，22，19： | 1 |
| 4 | New method for estimating flying capacitor voltages in stacked multicell and flying capacitor multicell converters显示文摘Multicell converters are an interesting alternative for medium voltage and high power applications,because of the increased number of output voltage levels and apparent frequency.The two most significant types of multicell converter are the flying capacitor multicell (FCM) converter and its derivative,stacked multicell (SM) converter.Balancing flying capacitor voltages is an important constraint to the proper performance of FCM and SM converters.Thus,observation of the flying capacitor voltages used in active control is valuable,but using voltage sensors for observation increases cost and size of the converter.This paper deals with a new strategy to estimate the flying capacitor voltages of both FCM and SM converters.The proposed strategy is based on a discrete time model of the converter and uses only a load current sensor.The circuit was simulated using PSCAD/EMTDC software and simulation results were presented to validate the effectiveness of the proposed estimation strategy in observing the flying capacitor voltages.Simplicity is the most significant advantage of the proposed strategy,its performance being based on simple equations. | Arash KHOSHKBAR SADIGH Gevorg B.GHAREHPETIAN Seyed Hossein HOSSEINI | 2010 | Journal of Zhejiang University-Science C(Computers and Electronics)2010，11，8： | 0 |
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