Modified formula for sensorless dc motor speed estimation was proposed through the test for relationship between the current ripple frequency and the rotation speed in a 4 - pole dc motor 摘要根据4极直流电动机的转速与脉动电流频率关系的实验结果,对现有的无传感器直流电动机测速公式提出了修正意见。
The new modified formula not only meets with our experiment result , but also can explain the examples of relationship between the speed and the current ripple frequency of dc motors in the literature 新的修正公式不仅能够解释文中的实验结果,也能满足以往文献提出的直流电动机转速与脉动电流频率之间的关系。
Thirdly , current ripple will be calculated in two current control mode respectively and paper will make a conclusion about its interaction with the voltage , current , frequence and so on . finally this paper will show the design of the controller and test waveforms 另外,本文分析了在两种电流控制方式下,即pwm控制和滞环控制下电流脉动和相绕组电压、相电流、转速和开关频率的关系。
The operation principle , stability and current ripple of the output filter inductor between serial and parallel modes are analyzed . a 1000 va serial and parallel combined dual buck half - bridge inverter ( dbhbi ) has been implemented to verify the analysis 文章分析了该逆变器的工作原理、串并联两种运行模式对输出滤波电感电流脉动、输入电压脉动、系统稳定性的影响,并以1000va双降压式半桥逆变器为例进行了实验验证。