Search found 424 matches
- Mon, 07 Oct 2013, 03:26
- Forum: General EV Discussion
- Topic: Help with drop in Torque
- Replies: 13
- Views: 1928
Help with drop in Torque
It does sound like it could be a loss of motor current capability in the controller. 5 years is a bit young for a Curtis to start packing it in (most seem to go for about a decade) but if it has been running hot, that may have aged it faster. A lot of electrical components have their lives halved fo...
- Sun, 06 Oct 2013, 20:58
- Forum: General EV Discussion
- Topic: Help with drop in Torque
- Replies: 13
- Views: 1928
Help with drop in Torque
Normally, high resistance connections on the battery side of the controller have more of an effect at high speed - where power and hence battery current is higher - rather than low speed acceleration. At low speeds the battery-side currents are quite low compared with the motor currents, so in your ...
- Mon, 30 Sep 2013, 00:51
- Forum: Members Machines
- Topic: Renard's BMW
- Replies: 237
- Views: 35444
Renard's BMW
The Zeva precharger utilises a solid state relay for switching precharge. It's tough to get them rated for voltages much higher than that. However your circuit above would avoid that problem. Hi all http://forums.aeva.asn.au/smileys/smiley1.gif The CPC1968 I use in the higher voltage precharger is ...
- Mon, 19 Aug 2013, 19:57
- Forum: AEVA WA Branch
- Topic: conversion advice please!
- Replies: 2
- Views: 945
conversion advice please!
Lapsed rego won't make much difference for the licensing process because when the time comes to get it re-licensed as an electric vehicle, the car has to pass a normal pit inspection anyway. You'd just have to get a Temporary Movement Permit to get it down to the pits if it is out of license. Howeve...
- Sat, 20 Jul 2013, 20:35
- Forum: For Sale/Wanted
- Topic: FS: Alltrax AXE4834 controller, near new, $150
- Replies: 5
- Views: 732
FS: Alltrax AXE4834 controller, near new, $150
Hi all, I recently purchased an Alltrax AXE4834 motor controller from EV Works on behalf of a client for use in an electric trolley, but they ended up wanting more torque so I had to upgrade them to a controller with more amps on tap. As such I now have a spare AXE4834 here, near new, with only a mo...
- Fri, 19 Jul 2013, 22:48
- Forum: Members Machines
- Topic: Glenn_aircooled Project tricycle
- Replies: 40
- Views: 5042
Glenn_aircooled Project tricycle
Reminds me of an old saying: There are three types of liars in the world. Liars, damned liars, and battery manufacturers! It's a pity there's no regulation on claims of battery capacity. Wouldn't it be great if there was an online database of independent test results for all the various cells availa...
- Wed, 26 Jun 2013, 19:27
- Forum: Members Machines
- Topic: Johny's Electric Vogue
- Replies: 287
- Views: 47881
Johny's Electric Vogue
Seems like a reasonable hypothesis. I can confirm that damaging devices from shoot through as a result of diode turn-off being slower than transistor turn-on is a real danger when using gate resistors around 10ohms (relative to your 100nC gate charge). I've blown up devices in similar ways before. I...
- Tue, 25 Jun 2013, 00:14
- Forum: Members Machines
- Topic: Johny's Electric Vogue
- Replies: 287
- Views: 47881
Johny's Electric Vogue
Capacitive load hey... so, turn it into a proper buck converter with added output inductor, and switch faster (like 20kHz)? Edit: On further consideration, I don't see how a capacitive load could explain the blown freewheel diode as well as the IGBT. The load might have acted enough like a short cir...
- Sun, 23 Jun 2013, 19:35
- Forum: General EV Discussion
- Topic: WA EV trial report
- Replies: 4
- Views: 728
WA EV trial report
This seems to be almost twice the consumption of higher efficiency AC motored EVs with regen braking etc. A point worth noting for the EV conversion industry. I think we're talking apples and oranges here. The Focus is not a small car. An more interesting comparison, I think, is with the production...
- Sun, 23 Jun 2013, 01:47
- Forum: For Sale/Wanted
- Topic: A few Tri-win DC40D-1250 water pumps, $30ea
- Replies: 4
- Views: 562
A few Tri-win DC40D-1250 water pumps, $30ea
Hi TJ,
Rated for 60degC - a little marginal for a cooling circuit I'll admit, certainly couldn't use it to water cool an ICE, but it is probably good to keep EV gear running below this temp anyway!?
Rated for 60degC - a little marginal for a cooling circuit I'll admit, certainly couldn't use it to water cool an ICE, but it is probably good to keep EV gear running below this temp anyway!?
- Sat, 22 Jun 2013, 04:34
- Forum: For Sale/Wanted
- Topic: A few Tri-win DC40D-1250 water pumps, $30ea
- Replies: 4
- Views: 562
A few Tri-win DC40D-1250 water pumps, $30ea
Hi all, I recently looked into getting a small pump for the water cooling circuit in my RX7, and after a bit of a hunt found a model with the right specs from a company called Tri-win. Unfortunately their minimum order was 5pcs, so I have 4pcs spare! So, does anyone need a cheap water pump (for moto...
- Sat, 15 Jun 2013, 03:18
- Forum: Technical and conversion discussion
- Topic: 70mm^2 Shielded Cable
- Replies: 6
- Views: 2047
70mm^2 Shielded Cable
Here in OZ, Huber Suhner may be an option. Check the Automotive Products catalogue link on the right of this page: http://www.hubersuhner.com/en/Products/Low-Frequency/Signal-and-Power-Cables e.g their "Radox" series screened battery cable, available up to 150sqmm. It may be hideously expensive thou...
- Thu, 06 Jun 2013, 21:49
- Forum: Technical and conversion discussion
- Topic: EV200 vs LEV200 contactors
- Replies: 10
- Views: 2322
EV200 vs LEV200 contactors
Pretty sure that is the primary difference, the LEVs don't have a coil economiser so use a bit more power when energised.
I'm more a fan of the EV200. Using 2W instead of 15W for the coil means they run cooler and should last longer.
I'm more a fan of the EV200. Using 2W instead of 15W for the coil means they run cooler and should last longer.
- Thu, 30 May 2013, 04:23
- Forum: Members Machines
- Topic: StudentEV's Daihatsu Conversion
- Replies: 106
- Views: 14302
StudentEV's Daihatsu Conversion
The manual does list "hardware over-current protection", so I wonder if it would do it if I dialed down the maximum current in the software? I think at the moment I don't have a maximum current set. That does sound like a hardware over-current system tripping. Most modern controllers have a softwar...
- Wed, 29 May 2013, 03:09
- Forum: Members Machines
- Topic: StudentEV's Daihatsu Conversion
- Replies: 106
- Views: 14302
StudentEV's Daihatsu Conversion
Kellys don't last long enough to be second hand http://forums.aeva.asn.au/smileys/smiley2.gif (Sort of joking, though I have witnessed a lot of failures over the years. Also the ones in the little silver cases lack the sustained power you need in a car, and the bigger ones seem to have a clumsy curr...
- Sat, 25 May 2013, 23:16
- Forum: Members Machines
- Topic: Ian Hooper's RX7 Conversion
- Replies: 102
- Views: 27457
Ian Hooper's RX7 Conversion
Oh man. I just need to vent.. After the driveshaft coupling came apart again a few weeks back, I had a new extra-beefy one made at great expense. Installed that today, went for a test drive, coupling seems good.. Then the Zilla packs it in again with the same old comms error which I thought was fixe...
- Mon, 20 May 2013, 04:39
- Forum: Members Machines
- Topic: Renard's BMW
- Replies: 237
- Views: 35444
Renard's BMW
The 0.47uF capacitor across IGBT probably isn't doing much harm nor good, except maybe harm to itself, and possibly a small amount of snubbing. Either way I'd be inclined to remove it, or put it in series with say a 10ohm resistor to make a proper RC snubber. What's your switching frequency? If you'...
- Sat, 11 May 2013, 20:26
- Forum: Technical and conversion discussion
- Topic: Some "don'ts" for EV building
- Replies: 60
- Views: 13568
Some "don'ts" for EV building
Don't be overambitious Or accept that your project will end up taking longer, costing more, and with a higher chance of failures. Simple designs are easier to build, maintain, and are usually more reliable. Unless you enjoy extensive troubleshooting, it is best to use well-proven, off the shelf com...
- Sun, 14 Apr 2013, 18:30
- Forum: Technical and conversion discussion
- Topic: Wanted: short busbar standoffs
- Replies: 6
- Views: 1695
Wanted: short busbar standoffs
Doesn't look like something that'd be too hard to make. Here's a piece of copper stock that might do the trick? http://www.ebay.com.au/itm/Copper-Bar-3-4-dia-x-250-mm-Steam-Sculpture-OG-/251255416967?pt=AU_Supplies&hash=item3a7ffd6887&_uhb=1#ht_500wt_1057 Edit: Or, get one of those 35mm ones and cut...
- Sun, 14 Apr 2013, 05:40
- Forum: EV Motoring
- Topic: Mercedes SLS Electric Drive
- Replies: 5
- Views: 1139
Mercedes SLS Electric Drive
It is a very slick machine, I like it a lot. Way out of the price range of normal people, but a great demonstration of things to come. I look forward to the day when I can get a 4WD electric car with torque vectoring (or I might just have to make one). I think it is a shame though that the thing end...
- Mon, 08 Apr 2013, 00:48
- Forum: Batteries, charging, management and monitoring
- Topic: Controlling the 12v aux battery
- Replies: 10
- Views: 2368
Controlling the 12v aux battery
It will be interesting to see how low you can get the current usage on this device. Adding any current draw at all to my 75mA will make the battery flatten even quicker. I note that according to the manual, the FGD+ draws about 35mA - so there is about half my usage! The low voltage cutout draws ve...
- Sun, 07 Apr 2013, 02:33
- Forum: Batteries, charging, management and monitoring
- Topic: Controlling the 12v aux battery
- Replies: 10
- Views: 2368
Controlling the 12v aux battery
I certainly agree that the IOTAs are not an ideal solution, being originally designed to run off AC, and being far from weatherproof. But they've always been good value and have been used in a *lot* of EVs over the years, for the most part giving pretty reliable service. Back when I was with EV Work...
- Sun, 07 Apr 2013, 00:22
- Forum: Batteries, charging, management and monitoring
- Topic: Controlling the 12v aux battery
- Replies: 10
- Views: 2368
Controlling the 12v aux battery
For the RX7 I'm using an IOTA DLS-55 HV DC/DC converter. I have two contactors in the vehicle, one (with precharge) for the motor controller, and an auxiliary contactor mid-pack (located at the +ve side of the rear pack) which effectively splits the pack voltage in half, and stops all loads on the H...
- Sat, 06 Apr 2013, 19:06
- Forum: Members Machines
- Topic: Ian Hooper's RX7 Conversion
- Replies: 102
- Views: 27457
Ian Hooper's RX7 Conversion
I'll get the prototype into the RX7 today and see how it goes. If it works as it should, I'm happy to send one your way for mates' rates http://forums.aeva.asn.au/smileys/smiley1.gif It basically has a comparator holding a power MOSFET closed whenever input voltage is above 12V, with a very slow res...
- Fri, 05 Apr 2013, 07:41
- Forum: Members Machines
- Topic: Ian Hooper's RX7 Conversion
- Replies: 102
- Views: 27457
Ian Hooper's RX7 Conversion
Hi all, First, the big news: The RX7 passed its pit inspection today and is officially road legal & licensed! http://forums.aeva.asn.au/smileys/smiley32.gif Not the most trouble-free process, quite a few hiccups along the way, but great to have this milestone done so I can start driving the car regu...