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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: 349991" data-attributes="member: 15198"><p>I looked at this "all ends up" yesterday. I wondered about looking</p><p></p><p>at it as a "black box" so I did the following.</p><p></p><p>I wondered what might happen to the reads on the ends of the wires</p><p></p><p>coming out, as Sidewinder says, there are only three and the centre</p><p></p><p>point, if there is one, is hidden.</p><p></p><p>So; Take reads of the resistance around the motor. The three should</p><p></p><p>be the same. Note it and call it step 1.</p><p></p><p>Now, short any two of the conductors and then take reads around the</p><p></p><p>other two, they will be the same and less than step 1.</p><p></p><p>Calculate the drop in resistance as a percentage betwen step 1 and</p><p></p><p>2. </p><p></p><p>I did this, wondering if there would be any difference between the star</p><p></p><p>and delta configuration with regard to the percentage decrease of the</p><p></p><p>read.</p><p></p><p>I did the algebra, worked examples, and finally a rig on a bread board.</p><p></p><p>Irrespective of the configuration, the drop (expressed as a percentage)</p><p></p><p>is the same - 25%.</p></blockquote><p></p>
[QUOTE="Technician, post: 349991, member: 15198"] I looked at this "all ends up" yesterday. I wondered about looking at it as a "black box" so I did the following. I wondered what might happen to the reads on the ends of the wires coming out, as Sidewinder says, there are only three and the centre point, if there is one, is hidden. So; Take reads of the resistance around the motor. The three should be the same. Note it and call it step 1. Now, short any two of the conductors and then take reads around the other two, they will be the same and less than step 1. Calculate the drop in resistance as a percentage betwen step 1 and 2. I did this, wondering if there would be any difference between the star and delta configuration with regard to the percentage decrease of the read. I did the algebra, worked examples, and finally a rig on a bread board. Irrespective of the configuration, the drop (expressed as a percentage) is the same - 25%. [/QUOTE]
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A Thought Experiment
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