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I would like to know what does the number/code (FE-078-1.5 29410) on the dc motor represent ?
What is the purpose of connecting a yellow wire on dc motor from the chip ?

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http://m711.photobucket.com/albumview/albums/kuxz2008/photo.jpg.html?pbauth=1_uLEBonVPfaLdh1h3YMYz2fZYIhjhAXTHRjo%2BkSaIUmTriNzdkVVEDl1l057ZUwiZkkdd4xCXH1a89ihOAcFFrfQjNUAFC3Q3W%2B07B5EbCvfRT4L8Fnj0VpqH2weM%2BHWXbS%2Bmf7%2FnmWUGLiXDoFRiQrDpAjK2U7g82nxjlhQHgF4%3D

http://m711.photobucket.com/albumview/albums/kuxz2008/photo-1.jpg.html?&pbauth=1_uLEBonVPfaLdh1h3YMYz2fZYIhjhAXTHRjo%2BkSaIUmTriNzdkVVEDl1l057ZUwiZkkdd4xCXH1a89ihOAcFFrfQjNUAFC3Q3W%2B07B5EbCvfRT4L8Fnj0VpqH2weM%2BHWXbS%2Bmf7%2FnmWUGLiXDoFRiQrDpAjK2U7g82nxjlhQHgF4%3D
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Quote
what does the number/code (FE-078-1.5 29410) on the dc motor represent
Probably the part number and the date code.

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What is the purpose of connecting a yellow wire on dc motor from the chip
You will have to provide a much better photograph and description. It could be the positional feedback signal if it is a servo but there is not enough context to answer this question.
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The yellow wire appears to be connected to the motor case so it would likely be for shielding or electrical filtering.  If you don't care about electrical noise you can probably leave it disconnected.
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