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Search: Posts Made By: syseng68k
Showing results 1 to 35 of 77
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Forum: Tech Log
2nd Apr 2013, 20:41
Replies: 1,100
Views: 261,318
Posted By syseng68k

kenneth house: Can't say for this one, but...

kenneth house:

Can't say for this one, but it's quite common for contactors of high
rating to have dual coils. The contact pressure required needs a strong
spring to keep contact resistance low,...
Forum: Tech Log
17th Mar 2013, 23:33
Replies: 1,100
Views: 261,318
Posted By syseng68k

Absolutely. Sounds like Orwell's Newspeak, where...

Absolutely. Sounds like Orwell's Newspeak, where some words vanish from the
dictionary and others take on entirely new meanings :suspect:.

If those batteries didn't suffer from thermal runaway,...
Forum: Tech Log
17th Mar 2013, 19:22
Replies: 1,100
Views: 261,318
Posted By syseng68k

Exactly, but yet another to add to the list...

Exactly, but yet another to add to the list :rolleyes:. Looking at the figures,
a cell with greater ampere hour capacity might have been a better
choice. I wonder how many discharge / charge...
Forum: Tech Log
17th Mar 2013, 15:46
Replies: 1,100
Views: 261,318
Posted By syseng68k

PickyPerkins, #1009: That's an interesting...

PickyPerkins, #1009:

That's an interesting post, thanks, though are there typos in the battery
load timeline ?:
If you have an accurate timeline, then you can calculate the total
watts hours...
Forum: Tech Log
11th Mar 2013, 00:10
Replies: 1,100
Views: 261,318
Posted By syseng68k

Agreed - we trashed this part of the design...

Agreed - we trashed this part of the design mercylessly a few weeks ago,
just as soon as pics of the enclosure became available :eek:.

That had me thinking about an overall scenario for the...
Forum: Tech Log
10th Mar 2013, 16:27
Replies: 1,100
Views: 261,318
Posted By syseng68k

HighWind, #908: Very welcome and judging by the...

HighWind, #908:
Very welcome and judging by the name, location and work, wind energy systems
perhaps ?.

Very good point, since any differential / imbalance between the two current sensors
are...
Forum: Tech Log
9th Mar 2013, 16:43
Replies: 1,100
Views: 261,318
Posted By syseng68k

archae86, #850: Thanks for that. Have had...

archae86, #850:

Thanks for that. Have had time to have a good read now and there's quite
a bit of fresh info to fill in more of the gaps.

The key points seem to be:

1) There are two...
Forum: Tech Log
7th Mar 2013, 21:32
Replies: 1,100
Views: 261,318
Posted By syseng68k

archae86: I get a few lines of javascript...

archae86:

I get a few lines of javascript from the link, which says access denied.
Have tried using firefox and IE with the same result, do you have a link
that works ?.

Was able to find the...
Forum: Tech Log
24th Feb 2013, 20:56
Replies: 1,100
Views: 261,318
Posted By syseng68k

Actually, the patented method doesn't look at...

Actually, the patented method doesn't look at temperature, but fwir, tracks
the voltage curve towards the inflexion point. Then when it gets a match
with an internal model of a cell's charging...
Forum: Tech Log
24th Feb 2013, 16:01
Replies: 1,100
Views: 261,318
Posted By syseng68k

smilin ed: The way I see it, it's inadequate...

smilin ed:

The way I see it, it's inadequate oversight of the complete battery
subsystem by any sufficiently qualified and experienced engineer. Perhaps
that's what happens when you hand over...
Forum: Tech Log
23rd Feb 2013, 20:41
Replies: 1,100
Views: 261,318
Posted By syseng68k

From this: Boeing readies short-term battery...

From this:

Boeing readies short-term battery fix, facing uncertainty | Business & Technology | The Seattle Times (http://seattletimes.com/html/businesstechnology/2020373450_boeing787xml.html)
...
Forum: Tech Log
17th Feb 2013, 20:46
Replies: 1,100
Views: 261,318
Posted By syseng68k

SOS: Agreed, just the idea of a casual blob of...

SOS:
Agreed, just the idea of a casual blob of silicon rubber anywhere inside that battery does
look like a bodge...

Anyway, looks like it will be grounded for months at least, with Boeing...
Forum: Tech Log
15th Feb 2013, 13:46
Replies: 1,100
Views: 261,318
Posted By syseng68k

FullWings Amazing and looks like a beautifully...

FullWings
Amazing and looks like a beautifully engineered piece of kit. Shows how
it can be done / should be done and wonder how the 787 managed to get it
so badly wrong.

Even if that wiring...
Forum: Tech Log
14th Feb 2013, 14:04
Replies: 1,100
Views: 261,318
Posted By syseng68k

Ian W For a critical subsystem like this, it...

Ian W

For a critical subsystem like this, it would be better to have automatic disconnect of
the battery at min voltage level, rather than depend on someone remembering to
switch the lights...
Forum: Tech Log
12th Feb 2013, 14:30
Replies: 1,100
Views: 261,318
Posted By syseng68k

RR_NDB: Agreed and comes back to what I was...

RR_NDB:

Agreed and comes back to what I was saying about inadequate logging in
terms of the number of parameters stored. At a minimum, each cell's voltage,
cell temperature and charge / load...
Forum: Tech Log
11th Feb 2013, 21:51
Replies: 1,100
Views: 261,318
Posted By syseng68k

MM43: Ideally, yes, but the devil's in the...

MM43:

Ideally, yes, but the devil's in the detail. It doesn't say, for example, if
temperature is sensed for each cell, nor does it say what the sample frequency
is, ie: how often data is...
Forum: Tech Log
11th Feb 2013, 18:26
Replies: 1,100
Views: 261,318
Posted By syseng68k

EEngr: I'm skeptical, in that the ripple...

EEngr:
I'm skeptical, in that the ripple current on the dc line will be directly
related to the inverter o/p frequency, which will be at most, in the low
Khz and more likely the low hundreds of...
Forum: Tech Log
11th Feb 2013, 17:53
Replies: 1,100
Views: 261,318
Posted By syseng68k

Lyman: It really isn't that complicated,...

Lyman:
It really isn't that complicated, starting from the premise that the cell will
work as advertised if not abused. I'm not a chemist and am quite happy to let
Yuasa deal with that and overall...
Forum: Tech Log
11th Feb 2013, 16:52
Replies: 1,100
Views: 261,318
Posted By syseng68k

saptzae: Very much so. Something that's been...

saptzae:
Very much so. Something that's been bothering me for some time is the almost
obsessive concentration in the reports about the batteries, but still not a word
about the data logs for the...
Forum: Tech Log
11th Feb 2013, 15:57
Replies: 1,100
Views: 261,318
Posted By syseng68k

Lyman: Imho, the precursor to the initial...

Lyman:
Imho, the precursor to the initial runaway should have been detected by the bms
as an excessive temp rise or temperature gradient in that cell. If each cell's
temperature is being ...
Forum: Tech Log
11th Feb 2013, 15:12
Replies: 1,100
Views: 261,318
Posted By syseng68k

saptzae, #623 Had a the same problem with a one...

saptzae, #623
Had a the same problem with a one off rotary inverter speed and voltage
control for a lab power supply. With any mechanical devoce in the loop, it
can be quite difficult to model /...
Forum: Tech Log
11th Feb 2013, 14:45
Replies: 1,100
Views: 261,318
Posted By syseng68k

RR_NDB, 606 Away for a few more days - work...

RR_NDB, 606

Away for a few more days - work still must be done :8.

Re: The red herring comment, spikes on the bus are way down the list
of possible suspects imho. Although the data sheets...
Forum: Tech Log
9th Feb 2013, 11:19
Replies: 1,100
Views: 261,318
Posted By syseng68k

saptzae: It was just intended to be a block...

saptzae:

It was just intended to be a block diagram to show the major components and
their interaction. I can redraw to show all the wires, but there wasn't
enough space between the cells on...
Forum: Tech Log
8th Feb 2013, 17:45
Replies: 1,100
Views: 261,318
Posted By syseng68k

Speed of Sound: We don't have that info....

Speed of Sound:

We don't have that info. Ideally a single sensor per cell, otherwise rapid temperature
rise in a single cell may not be seen in time to shut the system down...
Forum: Tech Log
8th Feb 2013, 16:12
Replies: 1,100
Views: 261,318
Posted By syseng68k

Battery Subsystem

Hi,

Here's a quick block diagram of all the major parts and their connections for the
battery subsystem. Info from what we know already and what seems to make sense.
...
Forum: Tech Log
8th Feb 2013, 15:19
Replies: 1,100
Views: 261,318
Posted By syseng68k

green granite: Thanks for that. The...

green granite:

Thanks for that. The confusion was over the description in the faq section, which
said something about uploading images via the attachment process. Photobucket it
is then.

If...
Forum: Tech Log
8th Feb 2013, 14:00
Replies: 1,100
Views: 261,318
Posted By syseng68k

Speed of Sound: Didn't someone else mention...

Speed of Sound:

Didn't someone else mention $12k as being the actual cost ?.

I would have thought that there would be an exchange program for such an item, as
they are too expensive just to...
Forum: Tech Log
8th Feb 2013, 12:03
Replies: 1,100
Views: 261,318
Posted By syseng68k

USMCProbe: Have seen a fair amount of...

USMCProbe:

Have seen a fair amount of Japanese electronics from the inside and while some
of the design can seem a little laboured, the attention to detail was second to none.
Might have slipped...
Forum: Tech Log
7th Feb 2013, 20:16
Replies: 1,100
Views: 261,318
Posted By syseng68k

Lyman: Sorry, but that's just guesswork...

Lyman:

Sorry, but that's just guesswork without any of the required science. Perhaps
ok in r&n, but tech log ?. Just because one man who has experience of the
technology for a different...
Forum: Tech Log
7th Feb 2013, 17:52
Replies: 1,100
Views: 261,318
Posted By syseng68k

Lyman: So, what about all the other...

Lyman:

So, what about all the other applications for these cells, for which we
have no news of any problems ?. As I said in an earlier post, they
have been approved for use by NASA, the ESA and...
Forum: Tech Log
7th Feb 2013, 17:19
Replies: 1,100
Views: 261,318
Posted By syseng68k

USMCProbe: So long as you realise that the...

USMCProbe:
So long as you realise that the phone would no longer function as a
phone, due to the sceening ?, but hey, it's still got the rest of it's
functionality, games, camera at both sides etc...
Forum: Tech Log
7th Feb 2013, 16:19
Replies: 1,100
Views: 261,318
Posted By syseng68k

Interesting update mentioned in r&n: Boeing...

Interesting update mentioned in r&n:

Boeing Plans Battery Redesign to Get Dreamliners Airbone Again | Frequent Business Traveler...
Forum: Tech Log
3rd Feb 2013, 23:15
Replies: 1,100
Views: 261,318
Posted By syseng68k

kilomikedelta: My take on that very funny...

kilomikedelta:

My take on that very funny post:

I have the gut feeling that we may be being led by the nose on this
enquiry. There's so much reputation and $ at stake that there may even
be...
Forum: Tech Log
3rd Feb 2013, 22:06
Replies: 1,100
Views: 261,318
Posted By syseng68k

Lyman: Mr Musk is free to have his opinion,...

Lyman:

Mr Musk is free to have his opinion, but to use the phrase, his is
just one man's opinion of moonlight. For any design problem, there are
usually > 1 valid solutions and Mr Musk's...
Forum: Tech Log
3rd Feb 2013, 22:03
Replies: 1,100
Views: 261,318
Posted By syseng68k

I really don't understand all the obsession with...

I really don't understand all the obsession with the batteries. Though
that is the part that failed, it's also the most low tech part of the
subsystem. Imho, those batteries were operated outside...
Showing results 1 to 35 of 77
 
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