tag:blogger.com,1999:blog-369941762441967690.post1868556216755014964..comments2022-11-26T01:46:19.151-08:00Comments on EV Z3: What An OrdealTim Catellierhttp://www.blogger.com/profile/02801279544184321528noreply@blogger.comBlogger6125tag:blogger.com,1999:blog-369941762441967690.post-52573233699439292732012-05-02T20:14:08.152-07:002012-05-02T20:14:08.152-07:00Franz,
My thought is the more air, the better. R...Franz,<br /><br />My thought is the more air, the better. Right now I'm concerned that the 105 cfm that fan puts out may not be enough. I may look for a better fan. These new, harder brushes are supposed to produce a lot lest dust, but we shall see.Tim Catellierhttps://www.blogger.com/profile/02801279544184321528noreply@blogger.comtag:blogger.com,1999:blog-369941762441967690.post-52397896149504552882012-05-01T22:58:59.488-07:002012-05-01T22:58:59.488-07:00Whenever possible, the airflow
through the motor s...Whenever possible, the airflow<br />through the motor should be in<br />the direction of the brushes to blow all the coal dust out of the motor.<br />The fan is on the correct side,<br />that should be ok as it is, but i dont know what happens when you are driving faster and there is a lot of <br />air flowing from all directions<br />around the motorvehikelfranzhttps://www.blogger.com/profile/10449865940679907208noreply@blogger.comtag:blogger.com,1999:blog-369941762441967690.post-25552768235563889372012-04-25T14:07:38.644-07:002012-04-25T14:07:38.644-07:00Joey,
What would really be interesting is to take...Joey,<br /><br />What would really be interesting is to take a reading of resistance after you seat the brushes, then blow the dust out with some compressed air and take the reading again. I highly doubt your brushes are going to dust as much as mine simply because of the circumstances. But still, it would be interesting to see if there's a difference.<br /><br />I'd be surprised if you see much of a difference in performance after the brushes are seated as from before. But if you could look into the motor and see the surface of the commutator, you'd likely see a little less arcing. <br /><br />By the way, in the two days the Z3 has been back on the road, I've put about 70 miles on it, and I've found that it's using less power than before. Before, the average was about 330 Watts/mile, but these last two days it's been 300. And that's while running the AC system the whole time. It makes me wonder if either the old racing brushes were some how less efficient at transmitting power, or there was some other problem with the motor. Can't say for sure, but I'll be keeping an eye on that.<br /><br />Your conversion is shaping up to be a real beauty. I'll be eagerly following your progress.Tim Catellierhttps://www.blogger.com/profile/02801279544184321528noreply@blogger.comtag:blogger.com,1999:blog-369941762441967690.post-81068691053450128932012-04-25T12:45:34.590-07:002012-04-25T12:45:34.590-07:00Tim, First thanks for the warning on the grease on...Tim, First thanks for the warning on the grease on the transmission shaft. I’m hoping to mate my motor to transmission in the next couple weeks.<br />I’m in the process of running my Warp9 with 12 volts to seat the brushes. I took a resistance measurement before I started and I get greater than 10 MOhms to the motor body. I’ll check again after 20 hours of run time.<br />Your comment about noise and vibration is interesting. It had to be due to the radius on the brush as you mentioned. I placed an accelerometer on my motor the first time I powered up, and measured 10 mili g’s of acceleration at 2100 RPM. It will be interesting to see if this number changes as the brushes form during run-in.<br />Here’s to hoping your motor issues are in the rear view.Joeyhttps://www.blogger.com/profile/01042435434585986098noreply@blogger.comtag:blogger.com,1999:blog-369941762441967690.post-79271262973378967292012-04-23T21:21:42.157-07:002012-04-23T21:21:42.157-07:00Alex,
Actually, the brushes for the 9" and 1...Alex,<br /><br />Actually, the brushes for the 9" and 11" motor are the same in all respects except the radius that's pressed into the end that rests on the commutator. The width, breadth, height and material are all identical. So it does cover the same number of bars on the commutator. <br /><br />I read in the EVDL archive that some leak is inevitable, but once the resistance gets low enough, they blow the motor out real well. In all cases, it's caused by the accumulation of carbon dust. Makes AC systems seem a bit more attractive.Tim Catellierhttps://www.blogger.com/profile/02801279544184321528noreply@blogger.comtag:blogger.com,1999:blog-369941762441967690.post-59458632954417660902012-04-23T20:42:35.162-07:002012-04-23T20:42:35.162-07:00Wow Tim, that's some saga! Glad to hear you...Wow Tim, that's some saga! Glad to hear you're back on the road. It's interesting that Warfield considers a small voltage leak acceptable. Perhaps it's impossible to completely isolate the case from the rotor when it's all made of metal? <br /><br />Not to make you second-guess your decision to keep the 9" brushes, but I wonder if the difference in size would affect how many comm bars the brushes can contact at once. In other words, if the 9" brushes are narrower (on the shortest dimension), they would contact slightly fewer comm bars, and perform at a slightly lower level due simply to a smaller surface area in contact with the commutator. What do you think?<br /><br />AlexAlexhttps://www.blogger.com/profile/00489761192866964078noreply@blogger.com