An engineer's diary
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[No. 4] The Historic Claw-Pole Machine
My grandson is interested in mathematics and history. Maybe it is an unusual combination, but both these subjects are helpful in looking forwards as well as backwards. In engineering we are often looking forwards, to find new and better ways. It has…
3 Dec 2018
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[No. 3] Görges diagram
The polygonal diagram of H. Görges (Das Görgessche Durchflutungspolygon) dates from 1907. Although it is highly developed in German literature, until recently it has been rare in English-language publications. Fig. 1 shows an example for a single-la…
5 Nov 2018
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[No. 2] ABC of engineering calculations today
Most engineering calculations take the path of analysis or simulation, shown in Fig. 1, A. Analysis has been established for a long time; but simulation is more recent, especially with digital computers. The process usually begins with physical dime…
1 Oct 2018
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[No. 1] When is a fluxmeter not a fluxmeter?
A fluxmeter is an integrating voltmeter. It never measures flux directly. It measures flux-linkage, the integral of voltage with respect to time. It is true that flux can be estimated from flux-linkage, but only by dividing by the number of turns in…
3 Sep 2018
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