Author Topic: a little gem  (Read 21649 times)

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Offline charlie_ruizpr

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Re: a little gem
« Reply #45 on: February 09, 2012, 10:55:02 pm »
This sounds interesting

Offline 97fishmt

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Re: a little gem
« Reply #46 on: February 11, 2012, 08:13:31 pm »
I cured my boredom today by building another little unit.

Same dimensions as the others.  And still some steel leftover.  :) 

I need more steel for the tail and its fabrication for others,  but I might
have enough of the other stuff for 3 more.  Not bad for $100.
This is the 3rd one. 

I guess I got the bug because I bought another servo motor
on ebay today.

KE 125 (volt/1000rpm)

I just can't let them go if they are cheap. :)


Offline bvan1941

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Re: a little gem
« Reply #47 on: February 21, 2012, 03:47:48 pm »
97 fishmt,
YEP, did it again------ bought another SERVO !
4.4kw, 400v,16A,1500rpm, $200  Just thought the specs looked tooo good !!

Gotta stop looking.  Haven't got the first one up--yet

Bill

Offline 97fishmt

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Re: a little gem
« Reply #48 on: February 25, 2012, 04:00:40 pm »
That is one to look for! 8)
I love the way it works with an 8' prop on it.

It's the same one I did the story of the 400 volt motor for 24 volt charging on.
( I only paid $40 for mine a few years ago )

I checked out my new motor today.  It cuts in @ 24.5 volts after the rectifiers @ 150 rpm.

I need to stop looking too but I keep meeting new folks up at the cabin and it's all I really
talk about so, they end up wanting a turbine after seeing my setup.

I just came home from the cabin.  I was trying out some new blades on a small unit and was kind of
disappointed.   (raptor blades)  I'll just have to keep making my own.  Carved blades have
worked the best for me yet.

Mike

Offline bvan1941

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Re: a little gem
« Reply #49 on: February 26, 2012, 10:10:04 pm »
Mike,
Is your new motor a 200v or a 400v motor? Curious because, trying to decide what voltage to use my new 400v Servo on. Do you think I should stay with the 9.2' rotors for that motor, in view of my lower wind speeds? 

By the way, now that I'm well into my project, just want to let you know I really am grateful to you and Adam for the support!
Bill ;)

Offline bvan1941

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Re: a little gem
« Reply #50 on: February 26, 2012, 10:39:54 pm »
Mike or Adam,
question about securing the servo "facemount" to the yaw mount. I think I saw your motor secured to the base mount by the bottom 2 holes in the servo. Maybe I missed something there? Don't want to think of it tearing loose, up there!
Planning to copy your mount, but would like to set the bottom plate at a 5 degree tilt up, so the prop has plenty of pole clearance. Believe that the width of the motor will be about the correct off set from the center of the pole. That would be about 5-6" for this first direct drive. Am I in the ball park? (9.2' Rotor planned).
Bill

Offline bvan1941

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Re: a little gem
« Reply #51 on: March 02, 2012, 02:00:07 pm »
Gents,
Has anyone given thought to how these 1000-1500rpm Servos can develop so much more power (1500-4400w) with magnets that are so thin,? It seems that servos produce much more power for their size, visualizing the differences in the two units. I will admit that the PMA's everyone's building are operating at a much lower operating speed (200-500rpm's), producing 700w-1200w of power. Maybe that IS the point ! Oztoules comments, that these servo units will at some point stop increasing power output with increased rpm's. Seems that could work in our favor when faced with very strong gusts or abnormally stronger winds than normally planned for.
Just wondering.
Bill

Offline bvan1941

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Re: a little gem
« Reply #52 on: March 14, 2012, 09:12:59 pm »
Gents,
Has anyone out there found a good resource for the "power connectors" on these Servo motors? I have a both a Fanuc-A06 and a Yaskawa Servo.
Bill

Offline 97fishmt

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Re: a little gem
« Reply #53 on: March 15, 2012, 06:56:47 pm »
Yes, it's all been gone over before. 
There is a local place for me in Seattle
called connector world. 

I placed a link in an old post.

But they are expensive.  Lately I have been soldering
on new wires on the pins with  10-12 crimp wire
connectors and just using an abs plumbing
elbow and sealing it up with silicone and electrical tape.
You can find elbows to thread right on to the motor connector.
Less than 2 bucks compared to about $35-$50.

I still buy the connectors for some motors though,
If you go to their web site and order one I bet you
could waterproof a standard connector yourself just
fine rather than buying their waterproof one.  It'll run
you over a hundred bucks. :o

Mike



Offline bvan1941

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Re: a little gem
« Reply #54 on: March 15, 2012, 08:09:35 pm »
Thanks mike,
I think making the connection with PVC or electrical connectors is much more sensible vice $$$$$$$  for the Mil Spec. original.
Bill

Offline bvan1941

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Re: a little gem
« Reply #55 on: March 15, 2012, 10:02:09 pm »
Has anyone got any new observations, quirks to share with their Servo installations??

Anyone utilizing the higher RPM's /voltages with Servos and using MPPT charge controllers (like Chris Olsen)?
Just curious what could be achieved going down that road with Servos.
Bill

PS: Still gathering pipe and wire for my own Servo WT ! Got all the rest together now.