It is currently Tue Mar 28, 2017 11:53 am



Welcome
Welcome to imhotep's labs

You are currently viewing our boards as a guest, which gives you limited access to view most discussions and access our other features. By joining our free community, you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content, and access many other special features. In addition, registered members also see less advertisements. Registration is fast, simple, and absolutely free, so please, join our community today!


Post new topic Reply to topic  [ 5 posts ] 
Author Message
 Post subject: Help with Fan?
PostPosted: Fri Apr 26, 2013 6:41 am 
Offline

Joined: Fri Apr 26, 2013 6:26 am
Posts: 3
Has thanked: 0 time
Have thanks: 0 time
Hi,

I was wondering if I could get a little help with my fan. I've built an SSG before, so I rewound the fan bifilar as per the video but litzed the wires together. I've checked many times but I can't seem to get it to spin. Is this photo correct or should I do something else? Thanks!

Mike
Trigger winding top to either side node on potentiometer?
Trigger winding bottom and Primary battery negative to emitter of transistor before diode?
Power winding bottom to collector of transistor before diode?
Charge battery positive after diode from collector?

Image


Top
 Profile Send private message  
 
 
 Post subject: Re: Help with Fan?
PostPosted: Mon Apr 29, 2013 11:38 pm 
Offline
Moderator

Joined: Wed Aug 13, 2008 11:48 pm
Posts: 1016
Has thanked: 0 time
Have thanks: 27 time
It looks correct, try increasing the voltage. Is the fan magnetically locked or does it turn freely?


Top
 Profile Send private message  
 
 Post subject: Re: Help with Fan?
PostPosted: Tue Apr 30, 2013 7:32 am 
Offline

Joined: Fri Apr 26, 2013 6:26 am
Posts: 3
Has thanked: 0 time
Have thanks: 0 time
Ah, different forum, different topic, but same thanks again! :) Tried with about 26 V, same thing. The fan spins freely. I did just notice that I get the little "ping" when I connect the circuit and sometimes a tiny motion from the fan that in the SSG tells you it's connected okay and the transistor activates. But no joy when I spin the fan up as hard as I like it just freewheels to a stop. Thanks for the once over, mbrownn, makes me more confident to go over things in more detail now I know that's how it should go. 8-) Edit--got it going with different fan with the windings it came with :D , looks like the connections in the photo are correct, this thing has some power! Thanks!

Mike (aka Blargus)


Top
 Profile Send private message  
 
 Post subject: Re: Help with Fan?
PostPosted: Tue Apr 30, 2013 11:38 pm 
Offline
Moderator

Joined: Wed Aug 13, 2008 11:48 pm
Posts: 1016
Has thanked: 0 time
Have thanks: 27 time
Sounds like the wires need swapping over. in one configuration the motor runs, in two others it spins freely and the fourth it locks up. Its worth checking your transistor too.


Top
 Profile Send private message  
 
 Post subject: Re: Help with Fan?
PostPosted: Fri May 03, 2013 9:25 pm 
Offline

Joined: Fri Apr 26, 2013 6:26 am
Posts: 3
Has thanked: 0 time
Have thanks: 0 time
Ok, thanks, transistor is OK, it seems just this fan is the problem as I got it working with other fan. Good to know about the configurations!


Top
 Profile Send private message  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 5 posts ] 


Who is online

Users browsing this forum: No registered users and 0 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  
cron
suspicion-preferred