Search found 492 matches

by bga
Sat, 11 Oct 2008, 07:35
Forum: Technical and conversion discussion
Topic: 100kW AC Inverter Project (Opensource)
Replies: 75
Views: 35849

100kW AC Inverter Project (Opensource)

That Zip file sounds about the correct size. The CC code is substantially the same as the Microchip code in the motor driver parts. It has additional CAN bus stuff, which I will attempt to understand eventually. This may also be from Microchip, but I haven't looked at it. I feel that the LabView st...
by bga
Fri, 10 Oct 2008, 21:04
Forum: Technical and conversion discussion
Topic: 100kW AC Inverter Project (Opensource)
Replies: 75
Views: 35849

100kW AC Inverter Project (Opensource)

Agreed. I was also considering film (the high current types) caps along the bus to reduce the bus inductance effects at the IGBTs. 1200V IGBTs offer some insurance. I've seen the Circuit Cellar article and managed to download all of their documentation and some source code. It allowed me to compare ...
by bga
Fri, 10 Oct 2008, 20:32
Forum: Technical and conversion discussion
Topic: 100kW AC Inverter Project (Opensource)
Replies: 75
Views: 35849

100kW AC Inverter Project (Opensource)

Johny, I have contacted Mike Trubridge at Fastron, he is sending some info. The MC3PHAC, that's impressive. I think that the PIC is the best choice, the PIC looks to be a lot faster and is fully programmable, allowing phase currents and all of the strange EV things to be accomodated. I think that I'...
by bga
Fri, 10 Oct 2008, 05:33
Forum: Technical and conversion discussion
Topic: 100kW AC Inverter Project (Opensource)
Replies: 75
Views: 35849

100kW AC Inverter Project (Opensource)

Hi Johny, Well spotted. Yes, I'll call Mike at Fastron tomorrow and order one. It sounds about ideal for a smallish motor drive. The PINout on the module suggests that it'll need a PCB for make the I/O bolt friendly. Better get the tables out and see how much copper I need for 100 Amps. I am working...
by bga
Wed, 08 Oct 2008, 03:29
Forum: Technical and conversion discussion
Topic: 100kW AC Inverter Project (Opensource)
Replies: 75
Views: 35849

100kW AC Inverter Project (Opensource)

Thanks for the info, BTW The capacitor specs are: EPCOS: type B43564-S9478-M3 450V 4700uF ESR (10kHz) 25milliohm 26.3 Amp ripple current (base cooled) gets an over-rating of approx 1.4 at 10kHz (40 amps). Nippon Chemi-con: Looks like the numbers may have changed since it was made. the current ones a...
by bga
Tue, 07 Oct 2008, 19:44
Forum: General EV Discussion
Topic: Electric Commodore
Replies: 20
Views: 2250

Electric Commodore

The Aptera was mentioned in New Scientist last week. It's an electric/Hybrid that weighs 800-odd kg, has a coefficient of drag of 0.15 or so, has a 10kWh battery and gets 190km on a charge! (estimated) They make a hybrid version that gets truly impressive average fuel ecomomy, I think 130MPG on long...
by bga
Tue, 07 Oct 2008, 05:39
Forum: Technical and conversion discussion
Topic: 100kW AC Inverter Project (Opensource)
Replies: 75
Views: 35849

100kW AC Inverter Project (Opensource)

Hi All, The bl***dy keyboard. I've lost this post 3 times now. I've resorted to typing it in a text editor and CPing to the browser. IGBTs and drive power --------------------- Johny, I was a bit concerned after I found out how much drive these things need. The literature suggests 1.25A of gate dri...
by bga
Fri, 03 Oct 2008, 17:56
Forum: Technical and conversion discussion
Topic: 100kW AC Inverter Project (Opensource)
Replies: 75
Views: 35849

100kW AC Inverter Project (Opensource)

Hi All, Some thoughts on building AC inverters: Johnny: The problem with upgrading the power semis is that the gate drive reqirement increases, so the controller may not be able to drive the IGBTs. Also, the bus filter capacitors won't be up to the incresased current. I would worry about the control...
by bga
Fri, 03 Oct 2008, 17:06
Forum: Electric motors and controllers
Topic: AC motors, multipoles, torque
Replies: 549
Views: 80488

AC motors, multipoles, torque

Hi AC, Another perverse thought for lower volts: What are the odds that the stator coils can be arranged to make them more parallel. The page: http://www.uiitraining.com/b51a/100/15104ac_motor_rewind_intro1.htm Has a tutorial on rewinding AC motors. It talks about the number of coils per phase. It m...
by bga
Fri, 03 Oct 2008, 16:31
Forum: General EV Discussion
Topic: Electric Commodore
Replies: 20
Views: 2250

Electric Commodore

Hi All, Just thinking out loud... Suppose a V8 diff, it has a lower ratio, say 3.55:1 or something like that, and a big induction motor is used, such as a Crompton Parkinson 30Kw W series Aluminium motor. Some numbers: CP 30KW 4 Pole W-DA200LRF      Frame size          = 200L (long)      Dimension  ...
by bga
Fri, 03 Oct 2008, 03:54
Forum: Electric motors and controllers
Topic: AC motors, multipoles, torque
Replies: 549
Views: 80488

AC motors, multipoles, torque

Hi All, With regards to Star-Delta, one of the first things that the Danfoss documentation (probably every manufacturer's) says is to strap the motor for delta. The VFD is just that, variable frequency, so the constant (50Hz) starting crutch afforded by star configuration is redundant. Star results ...
by bga
Tue, 16 Sep 2008, 18:35
Forum: General EV Discussion
Topic: formula
Replies: 33
Views: 3941

formula

Brook Crompton Parkinson web page:

http://www.brookcrompton.com/index.htm

Cheers

BGA
by bga
Tue, 16 Sep 2008, 17:10
Forum: General EV Discussion
Topic: formula
Replies: 33
Views: 3941

formula

Hi All, The ABB motor properties have changed since the Red Suzi's motor was made. Talked to New Era Electrical in Perth (9451 9922) this morning about Cropton Parkinson motor price and availability, they are either in stock in perth (11Kw & 22Kw avail. today) or on a short lead time: I read the 200...
by bga
Tue, 16 Sep 2008, 16:31
Forum: General EV Discussion
Topic: mainstream market to kill private conversions?
Replies: 14
Views: 1855

mainstream market to kill private conversions?

I wouldn't worry about the future too much. If anything, I would suspect the reverse: A wide market in EVs will make trips to the scrap dealers a lot more interesting. There will be conversions of ICE classics and older cars for a lot of years yet. The conversion cost and problems should be reduced ...
by bga
Tue, 16 Sep 2008, 16:17
Forum: General EV Discussion
Topic: formula
Replies: 33
Views: 3941

formula

Hi All, ABB has improved their motors a bit, here's a snippet from the 2008 catalog: General performance aluminum motors kW                                 Speed Efficiency        Power   In    Is    Tn Ts   Tmax       Weight                                    r/min                   factor        -...
by bga
Tue, 16 Sep 2008, 04:51
Forum: General EV Discussion
Topic: formula
Replies: 33
Views: 3941

formula

I've been doing a small survey- Western Electric has the best torque (226Nm) of my set in the 11KW range. The aluminuim version is relatively heavy at 107Kg compared to A similar, but less torquey 11KW Crompton Parkinson. I note that the CP motors have a very efficient range (92%+) and have more tor...
by bga
Fri, 05 Sep 2008, 19:41
Forum: Technical and conversion discussion
Topic: Air Con and Power Steering
Replies: 13
Views: 2351

Air Con and Power Steering

I have seen a project where they waere using a compressor out of a domestic inverter unit or similar. I think that the idea was to have only a single, easier to mount component for the compressor/motor. Involves a variable speed drive with suitable controller? Probably mechanically simpler, but tech...