Lecture Content Overview:

Field-oriented control of AC drives requires knowledge of the mechanical rotor position. Generally, this is detected by a position encoder, which has to be mounted on the shaft of the servo motor. In cost sensitive applications, however, when maximum performance is not required (for instance in traction drives), it is desirable to save this expensive sensor. Besides the cost advantage, encoderless control convinces with high mechanical robustness, as no sensitive electronic components are present in the machine. There are two main methods for encoderless position detection, the first is based on using the basic equations of the electrical machine (evaluating the back-EMF), whereas the second is based on additional signal injection. The back-EMF based methods typically detect the mechanical position by integration of the induced voltage, which is estimated with an asymptotic observer at nonzero speed. Around zero frequency, however, this method does not work in practice – here it is necessary to use a different method using high frequency signals to detect the rotor position. The resulting amplitude modulated information in the HF current is used to find what is called the anisotropy position, from which the rotor position may be estimated.

Lecturer's Profile:

Ralph Kennel教授是德国慕尼黑工业大学首席教授，银河工程模型预测控制领军专家、银河工程预测控制国际会议IEEE PRECEDE创始人。1984年获德国凯泽斯劳滕大学工学博士学位，在德国博世总部任职长达17年，担任伺服驱动控制、自动化部门主管等职务。1994年至1999年，任英国纽卡斯尔大学客座教授。1999年至2008年，在德国伍珀塔尔大学担任电力传动研究所所长、首席教授。2008年至2022年，任德国慕尼黑工业大学电力传动与电力电子研究所所长、首席教授。他担任（含曾任）IEEE PELS副主席、IEEE R8 第二负责人、IEEE PRECEDE创会主席、IEEE PELS全球伙伴主席等，获IEEE 卓越贡献奖、EPE杰出贡献奖、德国银河工程师协会 ETG奖章等。

Lecture Information:

时间：2024年5月20日（星期一） 下午13:30

地点：犀浦校区 三号教学楼 30519

主持人：朱晓娟 助理研究员

主办单位：轨道交通银河化与自动化111引智基地