Search found 17 matches

by thingstodo
Mon, 30 Jul 2012, 17:52
Forum: Technical and conversion discussion
Topic: Converting a gas Quad to AC
Replies: 95
Views: 16852

Converting a gas Quad to AC

So, what could be limiting the torque? The controller, or magnetic saturation, or...? Any idea? I know the question was not asked of me, but as usual I have an opinion ... I think the limit that you have right now is the voltage of your pack. If you had a higher voltage, your KIM could push more cu...
by thingstodo
Mon, 30 Jul 2012, 10:05
Forum: Technical and conversion discussion
Topic: Converting a gas Quad to AC
Replies: 95
Views: 16852

Converting a gas Quad to AC

I think the KIM lacks some kind of safety feature, I don't think this should be normal. We have worked with VFD inverter before, and never seen this kind of problem. Not at the level, at least. Can you capture all of the KIM settings and post them? It never hurts to have others read through them - ...
by thingstodo
Mon, 30 Jul 2012, 09:58
Forum: Technical and conversion discussion
Topic: Converting a gas Quad to AC
Replies: 95
Views: 16852

Converting a gas Quad to AC

Now we have a more serious problem. It's related to this "cogging" effect. I am using this term I stole from thingstodo, as I don't know a better one to describe this uneven torque thing we are getting. When we modify the proportional/integral values, we get this cogging effect. But usually, when u...
by thingstodo
Mon, 30 Jul 2012, 09:18
Forum: Technical and conversion discussion
Topic: Converting a gas Quad to AC
Replies: 95
Views: 16852

Converting a gas Quad to AC

... Unfortunately, the KIM shown a bizarre behaviour, unseen before. When decelerating to a stop, the KIM refused to really stop the work! You could read 10A or 20A still going to the controller, the Quad being totally stopped. The only way to kill the current was shutting off the controller; brake...
by thingstodo
Sat, 28 Jul 2012, 12:39
Forum: Technical and conversion discussion
Topic: Converting a gas Quad to AC
Replies: 95
Views: 16852

Converting a gas Quad to AC

My motor is rated at 1745 rpm, so the slip for rated torque should be 1800 - 1745 = 55 rpm. 55 rpm / 1800 rpm * 60 hz should be 1.8333 Hz, but 0.9 Hz works better - I'm not sure why. And for higher starting torque I should have to use a larger slip, like 2, 3, or maybe 5 Hz like you have used. When...
by thingstodo
Thu, 26 Jul 2012, 18:30
Forum: Technical and conversion discussion
Topic: Converting a gas Quad to AC
Replies: 95
Views: 16852

Converting a gas Quad to AC

Johny, the settings I posted work ok, no cogging. I get this cogging or jerkiness problem only when pushing "max acceleration slip" over 7 Hz, and only on start. I guess this slip frequency is too high when the motor is only working at 5 hz or less; I feel the motor is trying to reverse the spin fo...
by thingstodo
Thu, 26 Jul 2012, 18:00
Forum: Technical and conversion discussion
Topic: Converting a gas Quad to AC
Replies: 95
Views: 16852

Converting a gas Quad to AC

woody, thanks, there is a lot to learn about this PID system! Fortunately the KIM only uses 2 parameters of 3, proportional & integral. So less fooling around trying to adjust it... Here is a decent description - perhaps not technical enough - for PID control using cruise control as an example http...
by thingstodo
Sun, 22 Jul 2012, 16:49
Forum: Technical and conversion discussion
Topic: Converting a gas Quad to AC
Replies: 95
Views: 16852

Converting a gas Quad to AC

thingstodo, Yes, the 40 HP motor that I am attempting to use without a transmission is over 600 lbs. A beast by any measure. Maybe you will find this interesting. Wayland (from "white zombie" dragster fame) had a motor lightened machining new motor end plates (using aluminum). http://photos.plasmab...
by thingstodo
Wed, 18 Jul 2012, 22:28
Forum: Technical and conversion discussion
Topic: Converting a gas Quad to AC
Replies: 95
Views: 16852

Converting a gas Quad to AC

peskanov wrote:
I agree that external fans get dusty and they fail. If the motor gets up to 130C you will be able to tell from the heat you feel on the inside of your legs as you ride it!
That information leaves me more relaxed about the whole temperature thing, thanks a lot!
Your welcome!
by thingstodo
Wed, 18 Jul 2012, 22:26
Forum: Technical and conversion discussion
Topic: Converting a gas Quad to AC
Replies: 95
Views: 16852

Converting a gas Quad to AC

Well, as the motor was rewound to 63V, I am not sure what the Amps rating is now (but it should be quite higher). I am still learning to calcule amps on 3 phase systems; still, 30A seems higher than 50%, no matter how I calculate the nominal amps. Another quote from the motor faceplate posting but ...
by thingstodo
Wed, 18 Jul 2012, 21:58
Forum: Technical and conversion discussion
Topic: Converting a gas Quad to AC
Replies: 95
Views: 16852

Converting a gas Quad to AC

Thingstodo, thanks for your comments; are you the same thingstodo converting an S-10 to AC? I've been following your thread on ecomodder, I found it after seen your car on EValbum. Really great work, I am learning a lot in your thread. BTW, you are using a beast of a motor, industrial 30KW AC. It m...
by thingstodo
Tue, 17 Jul 2012, 21:47
Forum: Technical and conversion discussion
Topic: Converting a gas Quad to AC
Replies: 95
Views: 16852

Converting a gas Quad to AC

... The pump seems to work well, but it's too noisy. Really, really noisy. If we keep this cooling system, we will have to find an alternative pump, as this noise level is unbearable. After a few minutes running the Quad, the pump went to it's maximum output and expelled quite hot air. The case of ...
by thingstodo
Tue, 17 Jul 2012, 21:13
Forum: Technical and conversion discussion
Topic: Converting a gas Quad to AC
Replies: 95
Views: 16852

Converting a gas Quad to AC

Very interesting build! Well documented with pictures. Thank you for sharing. ... The current clamp in one of the phases showed 30A as maximum. Revving up, amps went down to 6A. That was at 3200 rpm, we didn't try higher revs as the motor is very old and just 4 poles 1500 rpm. Was the current clamp ...
by thingstodo
Sun, 29 Jan 2012, 19:41
Forum: Electric motors and controllers
Topic: big batteries and step up DC converters
Replies: 69
Views: 18139

big batteries and step up DC converters

Would it make sense to separate the Regen from the DC/DC step-up? Not sure what you mean here. There's no way to separate them at the VFD. There's just a single bidirectional DC bus. The step-up converter for drive and the step down converter for regen would have to have input paralleled with outpu...
by thingstodo
Sun, 29 Jan 2012, 18:06
Forum: Electric motors and controllers
Topic: big batteries and step up DC converters
Replies: 69
Views: 18139

big batteries and step up DC converters

That's clever. But I'm pretty sure these DC/DC converters would not be bidirectional and so they would not allow regenerative braking. Correct - no provision for regenerative braking. Using commercial-off-the-shelf (admittedly after taking it apart) is about as Keep It Simple as I can come up with....
by thingstodo
Sat, 28 Jan 2012, 22:13
Forum: Electric motors and controllers
Topic: big batteries and step up DC converters
Replies: 69
Views: 18139

big batteries and step up DC converters

Another alternative: - 12V DC to AC modified sine wave inverters are available off-the-shelf in multi-KW ratings - they contain a DC/DC converter, with a decent sized heat sink and fan - if they are powered by separate batteries, you can add the voltages in series It may be faster (less expensive?) ...
by thingstodo
Tue, 24 Jan 2012, 15:43
Forum: Batteries, charging, management and monitoring
Topic: Powering house off vehicle battery
Replies: 15
Views: 1694

Powering house off vehicle battery

...Could some of you comment on what you know about how to change the most common panel-on-the-roof setup supplying the grid to a setup where, should the grid go down, some switches could be thrown to isolate the house from the grid, and what also might need to be done to take advantage of the powe...