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#1 |
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Mega Poster
Join Date: Jun 2016
Location: NE Lincs
Posts: 1,082
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A "new" electric motor which can misalign its magnetic fields which is, apparently, a good thing (who knew?):
https://jalopnik.com/a-texas-startup...nce-1837173127 |
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#2 |
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Mega Poster
Join Date: Nov 2016
Location: Shropshire UK
Posts: 1,363
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Yes field weakening increases the speed of rotation but lowers the torque available, when we did motors at college ( too many years ago to think about )
https://www.sciencedirect.com/topics...akening-region We were taught that in a series wound motor that as the load falls the current falls but flux falls faster in the field winding ( stator ) and the speed increases until it spins itself into oblivion... series wound motors had advantages but most are shunt ( parallel ) wound or smaller ones permanent magnet. https://www.reddit.com/r/AskEngineer...motor_with_no/ If you watch the video of the Hunstable motor they replace the normal huge car battery with a battery that is about 90% smaller - they only claim 10% extra range so bit of a liberty to replace a 90Kw/h battery with two alkaline 'D' cells....
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2016 SV650 AL7 Courage is resistance to fear, mastery of fear, not absence of fear - Mark Twain Last edited by SV650rules; 14-08-19 at 08:48 AM. |
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