Practical Papers, Articles
and Application Notes

The first article of this issue is entitled “Electric field intensity emitted from medical devices and its potential electromotive force according to the quality of grounding,” by Eisuke Hanada, Hideaki Nakakuni, Takato Kudou, and Takashi Kano. The authors, belonging to the Medicine and Engineering Departments of Japanese Universities, discuss the dangerous effects of improper grounding of medical devices. In fact, they show that the build-up of electrical potential on such devices can produce shocks on patients and personnel touching them. The merit of this paper is to increase the awareness of the safe use of electrical devices in hospitals and patient-care rooms that are nowadays filled with electrically-operated apparatus. The second paper belongs to the “Education Corner” thread that I started a few issues ago. It represents the second of a two-part tutorial on EMC in power systems. In this paper, entitled “EMI in Modern AC Motor Drive Systems,” the author Firuz Zare (Queensland University of Technology, Brisbane, Australia) presents the major problem of modern motor drives that produce undesirable effects on electronic devices via conducted emissions. The key factors which should be considered at the beginning stage of a design to optimise a drive system are clearly outlined. In conclusion, I encourage (as always) all readers to actively participate in this column, either by submitting manuscripts they deem appropriate, or by nominating other authors having something exciting to share with the community. I will follow all suggestions, and with the help of independent reviewers, I hope to be able to provide a great variety of enjoyable and instructive papers. Please communicate with me, preferably by email at


Electric Field Intensity Emitted from Medical Devices and Its Potential Electromotive Force According to the Quality of Grounding

EMI in Modern AC Motor Drive Systems

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