{"id":122,"date":"2008-01-13T21:41:21","date_gmt":"2008-01-14T01:41:21","guid":{"rendered":"http:\/\/www.etotheipiplusone.net\/?p=122"},"modified":"2008-01-13T21:42:01","modified_gmt":"2008-01-14T01:42:01","slug":"omg-le-wheelmoteur","status":"publish","type":"post","link":"https:\/\/www.etotheipiplusone.net\/?p=122","title":{"rendered":"OMG L\u00c3\u2030 WHEELMOTEUR"},"content":{"rendered":"<p>It&#8217;s done! Structurally, anyways. And it&#8217;s really shiny.  Besides being shiny, it actually stands a chance of working.<\/p>\n<p><a href=\"\/pics\/sc2\/sc2_38.jpg\"><img loading=\"lazy\" decoding=\"async\" src=\"\/pics\/sc2\/tnsc2_38.jpg\" title=\"Holy crap, IT'S ROUND!!!\" height=\"96\" width=\"128\" \/><\/a> &#8230;because I&#8217;m fairly certain it has the same center of rotation throughout. If it does not, the discrepancy is too small to see or feel. The outer holes will be countersunk when I can get a sample of a 4-40 flathead cap screw.<\/p>\n<p>Outer plates of 6061 aluminum, can of steel.<\/p>\n<p><a href=\"\/pics\/sc2\/sc2_39.jpg\"><img loading=\"lazy\" decoding=\"async\" src=\"\/pics\/sc2\/tnsc2_39.jpg\" title=\"Don't tell any electrical engineers, or I might be shot while I sleep.\" height=\"96\" width=\"128\" \/><\/a> The insides. Getting the stator onto the internal hub was a bit of an adventure, and it got a bit mangled in the process. If I were to do this again with <a href=\"http:\/\/cities.media.mit.edu\">appropriate funding<\/a>, the stator will be a professionally made part. I bet that even if it works, the efficiency will be horrendous since the stator laminations are &#8220;insulated&#8221; with wood lacquer and made of hot rolled sheet steel, the stuff usually used for odd sculptures, not the cores of high performance electric motors.<\/p>\n<p><a href=\"\/pics\/sc2\/sc2_40.jpg\"><img loading=\"lazy\" decoding=\"async\" src=\"\/pics\/sc2\/tnsc2_40.jpg\" title=\"Introducing the WHEEEEEEEEE!!!!!!!!!lmotor.\" height=\"96\" width=\"128\" \/><\/a> With a wheel. The only thing that wobbles now is this wheel, which is most likely a quality issue. The wobble isn&#8217;t much at all &#8211; a hundredth or two at most. What sort of annoys me is that the tire profile is so tall, which means the motor has to have a relatively small diameter compared to the whole wheel. If I could go completely balls-out custom on this, the motor would be much larger and the tire custom-cast from urethane with a lower profile.<\/p>\n<p>The downside to a lower profile tire is less shock absorbtion, which could impact motor lifetime. That&#8217;s a matter of IRL testing.<\/p>\n<p>The magnets and magnet wire are still back in my dorm room, so I&#8217;ll finish this motor up when I return.<\/p>\n<p><a href=\"\/pics\/sc2\/sc2_38.jpg\"><img loading=\"lazy\" decoding=\"async\" src=\"\/pics\/tb5\/tntbsp1_26.jpg\" title=\"This gear will fight in place of the bot. And probably win.\" height=\"96\" width=\"128\" \/> <\/a> I also took the opportunity to trim down this gear for TB4.5&#8217;s arm geartrain. It will drive the rear link through a pin.<\/p>\n<p>Since I&#8217;ll be back on campus on Wednesday, I&#8217;m going to order some materials that will have parts cut out of them with various large machines. Some half-inch aluminum for the arm and frame bits, some quater-inch aluminum sheet for the wedges, Garolite for the top and bottom plates, and polycarbonate for the internal EBay components.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>It&#8217;s done! Structurally, anyways. And it&#8217;s really shiny. Besides being shiny, it actually stands a chance of working. &#8230;because I&#8217;m fairly certain it has the same center of rotation throughout. If it does not, the discrepancy is too small to see or feel. The outer holes will be countersunk when I can get a sample [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4,5,28,30],"tags":[35,15,40,36,26,31,41],"class_list":["post-122","post","type-post","status-publish","format-standard","hentry","category-bots","category-project-build-reports","category-razer","category-test-bot-45-sp1","tag-battlebots","tag-brushless","tag-electric-scooter","tag-fighting","tag-robot","tag-test-bot-45","tag-wheelmotor"],"_links":{"self":[{"href":"https:\/\/www.etotheipiplusone.net\/index.php?rest_route=\/wp\/v2\/posts\/122","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.etotheipiplusone.net\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.etotheipiplusone.net\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.etotheipiplusone.net\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.etotheipiplusone.net\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=122"}],"version-history":[{"count":0,"href":"https:\/\/www.etotheipiplusone.net\/index.php?rest_route=\/wp\/v2\/posts\/122\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.etotheipiplusone.net\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=122"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.etotheipiplusone.net\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=122"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.etotheipiplusone.net\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=122"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}