Joachim Holtz talks with
ScienceWatch.com and answers a few questions about
this month's Emerging Research Front Paper in the field of
Engineering. The author has also sent along an image
of his work.
Article: Sensorless control of induction machines -
With or without signal injection?
Journal: IEEE TRANS IND ELECTRON, 53 (1): 7-30 FEB
Addresses: Univ Wuppertal, Elect Machines & Dr Grp,
D-42097 Wuppertal, Germany.
Univ Wuppertal, Elect Machines & Dr Grp, D-42097
It introduces novel solutions to a topic of current research, and combines
this with an in-depth, state-of-the-art analysis. I know from many
inquiries that the subject is of interest both to industries and academic
Does it describe a new discovery, methodology, or
synthesis of knowledge?
It describes a new methodology and provides a synthesis of knowledge.
Would you summarize the significance of your paper in
Theory tells us that an induction motor is not observable when operating at
a low speed of rotation. This means that control of the motor speed is not
possible without using a speed sensor. The new method overcomes this
obstacle using a trick. Eliminating a speed sensor leads to cheaper and
more reliable motor drives.
How did you become involved in this research and were
any particular problems encountered along the way?
Research is one of my obligations as a university professor. I become aware
of any unsolved problems in my capacity as an industrial consultant.
Do you foresee any social or political implications for
I expect few social or political implications as a result of this research.
Professor Joachim Holtz
Head of the Electrical Machines and Drives Laboratory
University of Wuppertal