Re: [EVDL] Mosfet manufacturing request - Larger/Higher amp models
My view on this (and my experience in design and manufacturing
in general) is that it makes no sense for any manufacturer
to design and produce a products that will take many thousands
(likely around 100,000) dollars investment, then start up production
of a single batch, only to see that it takes years for that first
batch to be consumed by the few consumers.
Unless each consumer that buys a handful of them is willing to
spend a thousand dollars per part or so - then it can be very
lucrative, that is why very small scale production does happen
for special applications like nuclear plants, space vehicles
and so on. Spending only 4 figures on dedicated parts is
peanuts there.
Not so sure that any sensible controller designer would go down
this path, unless his design is expected to start running in
the tens of thousands of units, because at that moment the
NRE (Non Recurring Engineering) cost is only around $10 per
controller, so a dedicated development of parts becomes feasible.
Soooo - this is the old chicken and egg problem: until there
is a large market for EV controllers, there will be no dedicated
parts for EV controllers, which means that we will have to live
with what is out there in the market already.
Sometimes parts are present that are used for trains or other
high power EV applications, but most designs use low cost
transistors that are produced for other customers by the millions
and even buying several dozen of them is cheaper than a dedicated
part for an EV controller.
As soon as EVs take off big time (not a matter *if* they take off,
but only *when* they take off, in my mind) then you will see
plenty dedicated developments, just like you see plenty dedicated
developments for power tools or gensets.
Cor van de Water
Systems Architect
Proxim Wireless Corporation http://www.proxim.com
Email: [email protected] Private: http://www.cvandewater.com
Skype: cor_van_de_water IM: [email protected]
Tel: +1 408 542 5225 VoIP: +31 20 3987567 FWD# 25925
Fax: +1 408 731 3675 eFAX: +31-87-784-1130
Second Life: www.secondlife.com/?u=3b42cb3f4ae249319edb487991c30acb
-----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf Of Michael Barkley
Sent: Sunday, September 09, 2007 2:13 PM
To: EVDL.ORG EVDL.org
Subject: [EVDL] Mosfet manufacturing request - Larger/Higher amp models
Wondering? - Since MOSFET's seem to be the choice component in the controllers, looks like we really need to approach the manufacturer of these devices to see if they can produce larger versions so that there isn't the need to parallel them up to make the amperage that is needed. Surely there are other applications that these HIGH AMPERAGE versions would be useful in other than EV's. This could motivate them to produce them, and then the controllers we need could be made with less components and maybe more reliable. Again, just my mind wondering into lala land again.
M. Barkley
www.texomaev.com
http://www.austinev.org/evalbum/1135
_______________________________________________
For subscription options, see
http://lists.sjsu.edu/mailman/listinfo/ev
_______________________________________________
For subscription options, see
http://lists.sjsu.edu/mailman/listinfo/ev
My view on this (and my experience in design and manufacturing
in general) is that it makes no sense for any manufacturer
to design and produce a products that will take many thousands
(likely around 100,000) dollars investment, then start up production
of a single batch, only to see that it takes years for that first
batch to be consumed by the few consumers.
Unless each consumer that buys a handful of them is willing to
spend a thousand dollars per part or so - then it can be very
lucrative, that is why very small scale production does happen
for special applications like nuclear plants, space vehicles
and so on. Spending only 4 figures on dedicated parts is
peanuts there.
Not so sure that any sensible controller designer would go down
this path, unless his design is expected to start running in
the tens of thousands of units, because at that moment the
NRE (Non Recurring Engineering) cost is only around $10 per
controller, so a dedicated development of parts becomes feasible.
Soooo - this is the old chicken and egg problem: until there
is a large market for EV controllers, there will be no dedicated
parts for EV controllers, which means that we will have to live
with what is out there in the market already.
Sometimes parts are present that are used for trains or other
high power EV applications, but most designs use low cost
transistors that are produced for other customers by the millions
and even buying several dozen of them is cheaper than a dedicated
part for an EV controller.
As soon as EVs take off big time (not a matter *if* they take off,
but only *when* they take off, in my mind) then you will see
plenty dedicated developments, just like you see plenty dedicated
developments for power tools or gensets.
Cor van de Water
Systems Architect
Proxim Wireless Corporation http://www.proxim.com
Email: [email protected] Private: http://www.cvandewater.com
Skype: cor_van_de_water IM: [email protected]
Tel: +1 408 542 5225 VoIP: +31 20 3987567 FWD# 25925
Fax: +1 408 731 3675 eFAX: +31-87-784-1130
Second Life: www.secondlife.com/?u=3b42cb3f4ae249319edb487991c30acb
-----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf Of Michael Barkley
Sent: Sunday, September 09, 2007 2:13 PM
To: EVDL.ORG EVDL.org
Subject: [EVDL] Mosfet manufacturing request - Larger/Higher amp models
Wondering? - Since MOSFET's seem to be the choice component in the controllers, looks like we really need to approach the manufacturer of these devices to see if they can produce larger versions so that there isn't the need to parallel them up to make the amperage that is needed. Surely there are other applications that these HIGH AMPERAGE versions would be useful in other than EV's. This could motivate them to produce them, and then the controllers we need could be made with less components and maybe more reliable. Again, just my mind wondering into lala land again.
M. Barkley
www.texomaev.com
http://www.austinev.org/evalbum/1135
_______________________________________________
For subscription options, see
http://lists.sjsu.edu/mailman/listinfo/ev
_______________________________________________
For subscription options, see
http://lists.sjsu.edu/mailman/listinfo/ev