Search found 2701 matches

by antiscab
Fri, 17 Oct 2008, 04:09
Forum: Members Machines
Topic: evkartalex - My ev-Go-Kart project
Replies: 8
Views: 3331

evkartalex - My ev-Go-Kart project

ah of course, motors for the hydraulics ususally r PM (due to their easy to implement speed control).

Matt
by antiscab
Thu, 16 Oct 2008, 17:52
Forum: AEVA WA Branch
Topic: Hey all
Replies: 4
Views: 1473

Hey all

Hi alex, the controller can limit battery side amps independently to motor side amps at low speed. however, once Pmaxin = Pout, then the motor side amps falls off until it is equal to battery amps. forklift batteries arent known for their power density. you might have to trial and error a bit to wor...
by antiscab
Thu, 16 Oct 2008, 17:37
Forum: Members Machines
Topic: evkartalex - My ev-Go-Kart project
Replies: 8
Views: 3331

evkartalex - My ev-Go-Kart project

regarding regen, a boost converter will be needed to do regen, as the terminal voltage of the motor will always be lower than that of the battery pack (unless you somehow spin the motor faster than no load speed at full pac voltage) regen from a perm magnet motor can be achieved a full peak torque, ...
by antiscab
Wed, 15 Oct 2008, 17:34
Forum: Technical and conversion discussion
Topic: Hipo AWD project
Replies: 89
Views: 10419

Hipo AWD project

ah woody, you are neglecting voltage sag. when a 40AH cell is toasty (ie 50 deg c+) it *might* be able to do 200A, but at a voltage of 2.5v. that would give 550v for 220 cells or 110kw. MikeG, The price per peak kw is the same for thunderskys, lifebatt and just about any other LiFePO4 battery i have...
by antiscab
Wed, 15 Oct 2008, 04:10
Forum: Technical and conversion discussion
Topic: Hipo AWD project
Replies: 89
Views: 10419

Hipo AWD project

actually for 200kw you would need "only" 350A, which would be fine if we were talking about 90AH:p
by antiscab
Tue, 14 Oct 2008, 06:41
Forum: General EV Discussion
Topic: alternator assist
Replies: 12
Views: 1714

alternator assist

Pros = regen cons = extra weight and complexity i think that sums it up. to have a meaningful amount of regen you will need a fairly large alternator (unless you plan on gearing up a truck alternator to some insane rpm, at 3000rpm and a saturated field you *might* get 120v). to give you an idea of w...
by antiscab
Tue, 14 Oct 2008, 06:15
Forum: AEVA WA Branch
Topic: AEVA Perth Open Day - 12th October
Replies: 8
Views: 3554

AEVA Perth Open Day - 12th October

oh no blblaster....u got the pic of me eyeing off the vectrix lol
that thing really moves compared to my scooter....even after i increased the power 120%.

Matt
by antiscab
Tue, 14 Oct 2008, 06:05
Forum: General EV Discussion
Topic: Would this work on a E-mower
Replies: 5
Views: 890

Would this work on a E-mower

the surge requirement of some motors are *very* significant. my 450w (1.3kw surge) pure sine wave inverter was marginal when using an electric drill, and would sometimes cut out if i started it up too fast. you may have to go though some trial and error to work out how much surge capacity you need. ...
by antiscab
Sat, 11 Oct 2008, 17:14
Forum: EV Motoring
Topic: New AEVA Shirts
Replies: 7
Views: 1447

New AEVA Shirts

the manufacturer electric car or the shirt?
by antiscab
Thu, 09 Oct 2008, 08:35
Forum: Batteries, charging, management and monitoring
Topic: Ultra Batteries
Replies: 15
Views: 2706

Ultra Batteries

Theyre just caps and SLA's.

power density marginally better than high rate batteries such as the optima yellow tops (until the cap depletes).
bad energy density (worse than 'normal' lead due to the cap weight)
charge acceptance is just as good as an optima.

y would you bother.

Matt
by antiscab
Thu, 09 Oct 2008, 08:25
Forum: General EV Discussion
Topic: eV repairers
Replies: 1
Views: 506

eV repairers

its situations like that, places like the ev shop....and masons workshop if you know of it:p.....are *very* handy.

Matt
by antiscab
Wed, 08 Oct 2008, 07:23
Forum: General EV Discussion
Topic: Blade Runner from BEV
Replies: 10
Views: 1311

Blade Runner from BEV

slowly :( at present its still a rolling body. i need to organise a motor (i figure if i pester rob enough..i might buy one of his:p) at this stage it might move under its own power before christmas. btw, where are you located? if u r in perth i highly recommend coming to the open day (which just ha...
by antiscab
Wed, 08 Oct 2008, 05:22
Forum: General EV Discussion
Topic: Blade Runner from BEV
Replies: 10
Views: 1311

Blade Runner from BEV

hi soyachips,

the evshop here in perth is doing something similar with mitsubishi mirages from memory. they also do whole conversions.

Matt
by antiscab
Tue, 07 Oct 2008, 19:17
Forum: General EV Discussion
Topic: Heater-- Demister
Replies: 91
Views: 19103

Heater-- Demister

since they are just a transistor (i thought they would have used IGBTs) why would it matter if they are meant to switch AC or not?

Matt
by antiscab
Tue, 07 Oct 2008, 04:20
Forum: Members Machines
Topic: Red Suzi
Replies: 217
Views: 59334

Red Suzi

rubber mounts? oh no....u havent crossed over to the double isulation side have you? Image

Matt
by antiscab
Tue, 07 Oct 2008, 04:18
Forum: General EV Discussion
Topic: Heater-- Demister
Replies: 91
Views: 19103

Heater-- Demister

theres heaps and heaps of solid state switches on ebay

Matt
by antiscab
Mon, 06 Oct 2008, 01:54
Forum: General EV Discussion
Topic: 84v or 96v AC conversion using Curtis 1238
Replies: 25
Views: 7803

84v or 96v AC conversion using Curtis 1238

battery voltage will sag to 2vpc or less.
floodeds sag alot more than AGMs.
so 16 6v batteries would only give 96v under load.

i wonder if the new curtis 550A 96v ac controller is still analogue like the old 1231C?
i wonder if it works for perm-magnet synchronous motors aswell

Matt
by antiscab
Mon, 06 Oct 2008, 01:32
Forum: General EV Discussion
Topic: Electric Commodore
Replies: 20
Views: 2250

Electric Commodore

i think this is what you might be after:
emis

be warned though, where as as a pure ev you might be able to put 600kg of batteries in, as a hybrid, you can only fit 1-200kg.

Matt
by antiscab
Sun, 05 Oct 2008, 03:30
Forum: General EV Discussion
Topic: Electric Commodore
Replies: 20
Views: 2250

Electric Commodore

having another mull over your first post Dave,
have you ever recorded your fuel economy while pulling a 800kg trailer?
if you need 80-100km range often, but not everyday, your trailer idea might work out.
you would still need 20-30 batteries in the trailer.

Matt
by antiscab
Sat, 04 Oct 2008, 22:20
Forum: Technical and conversion discussion
Topic: 100kW AC Inverter Project (Opensource)
Replies: 75
Views: 35849

100kW AC Inverter Project (Opensource)

Tuarn, does danfoss have a suggested minimum and maximum motor size for their drives? do they mention a minimum motor side inductance? the derating would probably have to be increased if there isnt enough motor inductance for continuous current on the motor side at the switching frequency. the only ...
by antiscab
Sat, 04 Oct 2008, 18:42
Forum: AEVA WA Branch
Topic: engineering in perth
Replies: 3
Views: 1536

engineering in perth

i would be interested in this aswell....trying to work out what i can do to further the EV world as a graduate EE without having to start my own company or having to work for the likes of ford or holden.

the question makes perfect sense lowndsy.

Matt
by antiscab
Sat, 04 Oct 2008, 18:39
Forum: Technical and conversion discussion
Topic: 100kW AC Inverter Project (Opensource)
Replies: 75
Views: 35849

100kW AC Inverter Project (Opensource)

hang on....i may have made an error here: 100A (141A peak) RMS on each phase would give around 72kw at 600v input (415v RMS out). so not as far out of this world is i previously suggested. i still think 300A rated IGBTs would be too small. a danfoss 5042 uses 150A IGBTs, and its only rated to 40kva....
by antiscab
Sat, 04 Oct 2008, 18:34
Forum: Technical and conversion discussion
Topic: 100kW AC Inverter Project (Opensource)
Replies: 75
Views: 35849

100kW AC Inverter Project (Opensource)

Hi BGA, i doubt 300A rated IGBTs would do 100kw, even at 600v on the input. you have to derate the IGBTs away from their maximums by at least a factor of 3. 300A is the absolute limit of a 300A rated IGBT. so at the peak of the cycle, 300A is the limit = 212A RMS. but 300A at the peak assumes the du...
by antiscab
Sat, 04 Oct 2008, 06:49
Forum: General EV Discussion
Topic: Electric Commodore
Replies: 20
Views: 2250

Electric Commodore

dave, if you want 80-100km range you will either have to go lithium, or get a much larger genset. 50km range would require 600kg of lead batteries (even in a commodore, thats coming close to its limits) a genset to double your range would need to put 10kw into the battery side (not necessarily the b...
by antiscab
Sat, 04 Oct 2008, 03:59
Forum: Electric motors and controllers
Topic: AC motors, multipoles, torque
Replies: 549
Views: 80488

AC motors, multipoles, torque

hi BGA,

actually there is a side advantage to lower voltages, the option to use mosfets in place of IGBTs.
Mosfets are easily parralleled for big current.
just a thought.

Matt