Search found 153 matches

by peskanov
Wed, 24 Oct 2012, 06:49
Forum: Electric motors and controllers
Topic: Check out these Chinese AC controllers
Replies: 27
Views: 4757

Check out these Chinese AC controllers

Ok, we went for it. We should receive the controller soon. Communication with the company was difficult, their English is very poor. Price for the 300A & 400A is, suprisingly, the same (only $10 of difference). We got a .pdf and a few pics (still no manual). I'm posting the pics here; 1st software s...
by peskanov
Tue, 09 Oct 2012, 05:46
Forum: Electric motors and controllers
Topic: Check out these Chinese AC controllers
Replies: 27
Views: 4757

Check out these Chinese AC controllers

Hi there; I am thinking about purchasing a new, more powerful controller for the Quad 48V AC conversion. Looking all the available options, I found these Chinese controllers in Ali-Baba. Price is 1/2 to 1/3 of similar Curtis/Sevcon products. http://www.alibaba.com/product-gs/621896673/LR8040A_72V_80...
by peskanov
Sat, 11 Aug 2012, 07:55
Forum: Technical and conversion discussion
Topic: Converting a gas Quad to AC
Replies: 95
Views: 16592

Converting a gas Quad to AC

More updates; going back to the cooling problem: we felt our original internal cooling system was too noisy, so we looked for alternatives. Without cooling the motor reaches 100C quite soon. First, we tried to subtitute the air pump with hair-dryer fans. Those lacked the pressure needed to push the ...
by peskanov
Sat, 11 Aug 2012, 07:15
Forum: Technical and conversion discussion
Topic: Converting a gas Quad to AC
Replies: 95
Views: 16592

Converting a gas Quad to AC

Some news from past 2 weeks: I installed a multimeter onboard in order to see AC motor voltage. I know a PWM signal is difficult to measure using a common multimeter, but I have one which usually shows rather credible numbers (brand "hq power", no idea if it's any good). With KIM set to 10V minimum,...
by peskanov
Sat, 11 Aug 2012, 06:24
Forum: Technical and conversion discussion
Topic: Converting a gas Quad to AC
Replies: 95
Views: 16592

Converting a gas Quad to AC

coulomb, thanks for your explanations. It seems I missunderstood the derivative parameter, tutorials about PID controls are really hard to follow. antiscab, I understand slip should never be greater than 100%? If I set a 7 hz slip in the controller, then minimum stator Hz should be set 7 (for 100% s...
by peskanov
Tue, 31 Jul 2012, 10:48
Forum: Technical and conversion discussion
Topic: Converting a gas Quad to AC
Replies: 95
Views: 16592

Converting a gas Quad to AC

Am I the only one puzzled about the KIM having the slip measured in Hz, instead of %?
by peskanov
Tue, 31 Jul 2012, 10:38
Forum: Technical and conversion discussion
Topic: Converting a gas Quad to AC
Replies: 95
Views: 16592

Converting a gas Quad to AC

Johny, yes, KIM docs are minimalistic http://forums.aeva.asn.au/smileys/smiley4.gif We did try several combinations for proportional/integral values, but did not get a "feeling" of what was happening. Now that I read the tutorials on PID control, I think I have a better understanding about how to se...
by peskanov
Tue, 31 Jul 2012, 10:12
Forum: Technical and conversion discussion
Topic: Converting a gas Quad to AC
Replies: 95
Views: 16592

Converting a gas Quad to AC

thingstodo, I don't know the KIM - is there a setting for DC brake? On industrial drives many allow you to 'hold' the motor in position for a few seconds by injecting DC to the field. That group of settings has a maximum time, so the motor is not heated up just sitting there. It also has a frequency...
by peskanov
Mon, 30 Jul 2012, 05:03
Forum: Technical and conversion discussion
Topic: Converting a gas Quad to AC
Replies: 95
Views: 16592

Converting a gas Quad to AC

These last days we tried to play with the settings Johnny & thingstodo suggested. Results have been mixed. Reducing the acceleration rate seems to improve vehicle starting, but we can accomplish the same effect just being gentle with the throttle. Lowering the min. frequency also seems to help, but ...
by peskanov
Mon, 30 Jul 2012, 04:22
Forum: Technical and conversion discussion
Topic: Converting a gas Quad to AC
Replies: 95
Views: 16592

Converting a gas Quad to AC

thingstodo, we tried to reduce minimal frequency, and it seems to help a bit with low rpm torque. 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 b...
by peskanov
Mon, 30 Jul 2012, 04:10
Forum: Technical and conversion discussion
Topic: Converting a gas Quad to AC
Replies: 95
Views: 16592

Converting a gas Quad to AC

Johny, we don't have the tachometer installed (yet). That should help getting real torque numbers. However, we can measure the slopes we are climbing. Looking at your table, steepest grade seems to be 1 in 2.6. If I am not wrong, that is 21 degrees. That sounds right, we tried to climb a 36 degrees ...
by peskanov
Thu, 26 Jul 2012, 14:33
Forum: Technical and conversion discussion
Topic: Converting a gas Quad to AC
Replies: 95
Views: 16592

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 peskanov
Thu, 26 Jul 2012, 14:04
Forum: Technical and conversion discussion
Topic: Converting a gas Quad to AC
Replies: 95
Views: 16592

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...
by peskanov
Wed, 25 Jul 2012, 15:11
Forum: Technical and conversion discussion
Topic: Converting a gas Quad to AC
Replies: 95
Views: 16592

Converting a gas Quad to AC

We have been toying with the Quad several times now, and I am already finding limits I cannot surpass changing the settings of the Kelly KIM. Of course, my understanding of the settings is limited and Kelly's documentation is minimal. My biggest problems right now: - Locked rotor torque, and pull-up...
by peskanov
Wed, 25 Jul 2012, 14:42
Forum: Technical and conversion discussion
Topic: Converting a gas Quad to AC
Replies: 95
Views: 16592

Converting a gas Quad to AC

weber,
that's good to know, because we were interested in that kind of encoder in the past.
We even have a 36 teeth cog for it. I thought 36 pulses would be enough for the controller, now I know better. Thanks.
by peskanov
Mon, 23 Jul 2012, 13:25
Forum: Technical and conversion discussion
Topic: Converting a gas Quad to AC
Replies: 95
Views: 16592

Converting a gas Quad to AC

Maybe you will find this shaft connection interesting. I found it recently, it's pretty simple and it even implements a cheap encoder. http://www.evalbum.com/1687 About the coils; I am pretty sure the technician was determined to use the same wire size, in order to fit the new coils in the same spac...
by peskanov
Sun, 22 Jul 2012, 14:05
Forum: Technical and conversion discussion
Topic: Converting a gas Quad to AC
Replies: 95
Views: 16592

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.plasmabo...
by peskanov
Sun, 22 Jul 2012, 12:40
Forum: Technical and conversion discussion
Topic: Converting a gas Quad to AC
Replies: 95
Views: 16592

Converting a gas Quad to AC

Ok, I take back what I said about our cooling experiment. Airflow is enough, it works. We tested the Quad on a very hot day, about 40o C (we rarely see higher temperatures here, hottest I remember was 45). We have a thermistor set near the coils, and out of the air flow path. We ran the Quad on a sm...
by peskanov
Wed, 18 Jul 2012, 15:50
Forum: Technical and conversion discussion
Topic: Converting a gas Quad to AC
Replies: 95
Views: 16592

Converting a gas Quad to AC

Some new information about our conversion: weight. Original weight (without gas in the tank) was 180 KG, 88.5 front, 91.5 rear (pounds: 397, 195 & 202) Current weight, with nearly all EV components installed: 212 KG, 122 front, 90 rear (pounds: 467, 269 & 198) Increase in weight is ~30 KG, not bad....
by peskanov
Wed, 18 Jul 2012, 15:28
Forum: Technical and conversion discussion
Topic: Converting a gas Quad to AC
Replies: 95
Views: 16592

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 mu...
by peskanov
Wed, 18 Jul 2012, 14:41
Forum: Technical and conversion discussion
Topic: Converting a gas Quad to AC
Replies: 95
Views: 16592

Converting a gas Quad to AC

Johny, The current clamp meter is unlikely to be able to accurately read the PWM signals that are being fed to the motor phases. When you revved up, the PWM became closer to a normal steady waveform so the meter may have seen this "more correctly". I would not take much notice of motor current as re...
by peskanov
Fri, 13 Jul 2012, 05:15
Forum: Technical and conversion discussion
Topic: Converting a gas Quad to AC
Replies: 95
Views: 16592

Converting a gas Quad to AC

Yesterday we built our experimental internal air cooling system. I hope these pics will explain the idea better than my broken english http://forums.aeva.asn.au/smileys/smiley17.gif That's the motor back cover, drilled to place air inlets: https://lh4.googleusercontent.com/-X6k3W-k1sIg/T_69y_amPoI/A...
by peskanov
Mon, 09 Jul 2012, 00:09
Forum: Technical and conversion discussion
Topic: Converting a gas Quad to AC
Replies: 95
Views: 16592

Converting a gas Quad to AC

After the pack, we fitted the KIM controller: https://lh4.googleusercontent.com/-0lXq6uAThiE/T_k2-2WTyQI/AAAAAAAAAGc/BQ1rHVKlZnU/s640/controller_fitting.jpg Controller fans: https://lh5.googleusercontent.com/-ejlYJT38kCU/T_k2-Z8mYhI/AAAAAAAAAGU/7brFgzu4Sd8/s640/controller_fans.jpg And the motor. We ...
by peskanov
Sun, 08 Jul 2012, 23:57
Forum: Technical and conversion discussion
Topic: Converting a gas Quad to AC
Replies: 95
Views: 16592

Converting a gas Quad to AC

Fitting the cells. The bracing mechanism is somewhat ad-hoc. https://lh6.googleusercontent.com/-JkH2RuXEMHs/T_k3AL5A_EI/AAAAAAAAAGw/UFNkkbmxb-s/s640/pack_assembly.jpg Wiring of the first box; red wires go to bms & cell monitoring: https://lh3.googleusercontent.com/-c7cvMPMURWM/T_k3DJQBMdI/AAAAAAAAAH...
by peskanov
Sun, 08 Jul 2012, 23:47
Forum: Technical and conversion discussion
Topic: Converting a gas Quad to AC
Replies: 95
Views: 16592

Converting a gas Quad to AC

It's alive! Having all pieces, we assembled the thing. It took about 4-6 weekends to get it to working state. Some pictures of the process... Steel battery boxes, welded to the chassis: https://lh3.googleusercontent.com/-Lzr2fQKyQ6Q/T_k29HTpFKI/AAAAAAAAAGM/ZZRLI-OJiOw/s640/battery_box_1.jpg Another ...