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Do-It-Yourself (DIY) Question & Answer Forum
A Thought Experiment
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<blockquote data-quote="Technician" data-source="post: 349663" data-attributes="member: 15198"><p>I have had an idea.</p><p></p><p>Arrange to pass a small direct current through</p><p></p><p>the motor windings using a small power source,</p><p></p><p>like a battery.</p><p></p><p>Measure said current. Do this three ways.</p><p></p><p>Record results. They should be the same.</p><p></p><p>Now, let one terminal be A the next B and the next C.</p><p></p><p>The battery and its ammeter are connected to A &amp; B.</p><p></p><p>Measure the voltage between terminal A and C and</p><p></p><p>then B &amp; C.</p><p></p><p>If this measured voltage is half the applied voltage,</p><p></p><p>i.e. V (A/C) and V (B/C) is half voltage A/B then</p><p></p><p>chances are this is a delta connected machine.</p><p></p><p>Now, connect another ammeter so that it is teminated</p><p></p><p>at winding C at one side and to A on the other.</p><p></p><p>This puts the windings at A and C in parallel. This</p><p></p><p>ammeter should show half the reading of the other one</p><p></p><p>which is measuring total current.</p><p></p><p>If you do this on a delta connected motor you will short</p><p></p><p>the energy source and this ammeter will go off scale.</p><p></p><p>Hope this is clear but I am open to suggestions &amp; questions.</p><p></p><p>I have sketched this out on a cigar box and it looks OK.</p></blockquote><p></p>
[QUOTE="Technician, post: 349663, member: 15198"] I have had an idea. Arrange to pass a small direct current through the motor windings using a small power source, like a battery. Measure said current. Do this three ways. Record results. They should be the same. Now, let one terminal be A the next B and the next C. The battery and its ammeter are connected to A & B. Measure the voltage between terminal A and C and then B & C. If this measured voltage is half the applied voltage, i.e. V (A/C) and V (B/C) is half voltage A/B then chances are this is a delta connected machine. Now, connect another ammeter so that it is teminated at winding C at one side and to A on the other. This puts the windings at A and C in parallel. This ammeter should show half the reading of the other one which is measuring total current. If you do this on a delta connected motor you will short the energy source and this ammeter will go off scale. Hope this is clear but I am open to suggestions & questions. I have sketched this out on a cigar box and it looks OK. [/QUOTE]
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A Thought Experiment
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