Search found 2624 matches

by weber
Sat, 07 Mar 2009, 17:05
Forum: Technical and conversion discussion
Topic: trip meter / charge remaining
Replies: 16
Views: 2178

trip meter / charge remaining

I've used the Victron BMV-600 battery monitor on three solar power systems (48 volt batteries) and the customers seem happy with them. They do Peukert compensation (programmable exponent) and have a relay contact output whose trip point can be programmed based on state-of-charge or voltage, as well ...
by weber
Sat, 28 Feb 2009, 05:27
Forum: Electric motors and controllers
Topic: AC motors, multipoles, torque
Replies: 549
Views: 68665

AC motors, multipoles, torque

From what I see the 22kW 2-pole 132-frame has been removed from ABB catalouge. Also the 11, 15 and 18.5kW have been recategorised as High output. Thanks for letting us know about the new 1/2009 Industrial Performance Motors (IPM) catalog. But there is another ABB motor catalog of interest to us: th...
by weber
Sat, 28 Feb 2009, 00:42
Forum: Electric motors and controllers
Topic: AC motors, multipoles, torque
Replies: 549
Views: 68665

AC motors, multipoles, torque

I don't believe anything special happens around 70 Hz if you're still giving the motor its rated V/f. ABB show graphs of continuous torque up to 100 Hz, although those are for _constant_ voltage above 50 Hz. All that I'd expect to happen as you increase both V and f in proportion is that certain kin...
by weber
Wed, 25 Feb 2009, 08:55
Forum: General EV Discussion
Topic: Electric Beemer
Replies: 144
Views: 14937

Electric Beemer

Sorry, still flame on Ts. (you do mean torque at zero RPM with 50Hz applied I guess) Not breakdown or pullout torque ? Aha! Good question. I never mentioned stall torque, Ts, or torque at zero RPM, which I agree are all the same thing and I agree are all irrelevant to VFD driven motors. You were ap...
by weber
Wed, 25 Feb 2009, 07:13
Forum: General EV Discussion
Topic: Electric Beemer
Replies: 144
Views: 14937

Electric Beemer

Exactly, Danfoss calles it load dependent v/f. Crank it on at low RPM and up to twice the v/f can be applied. I can assure you it works !! The red suzi in lead acid at 1200kg and direct drive leaps off the mark. ... Breakdown torque + extra torque due to incresed v/f at low RPM means peak torque is...
by weber
Wed, 25 Feb 2009, 06:00
Forum: General EV Discussion
Topic: Electric Beemer
Replies: 144
Views: 14937

Electric Beemer

Sorry to be the bearer of bad news, acmotor and Richo, but Woody and coulomb have already said the same thing, and I suspect we all got it from chapter 4 of this, starting on page 9, which I have no reason to doubt: http://library.abb.com/global/scot/scot201.nsf/veritydisplay/c223e9ac8066f9fac1256d2...
by weber
Wed, 25 Feb 2009, 03:16
Forum: General EV Discussion
Topic: Electric Beemer
Replies: 144
Views: 14937

Electric Beemer

I did a little graph comparing direct drive and gears power at the diff. km/h vs power: http://forums.aeva.asn.au/uploads/311/gears.png Woody! Mate! Your blood's worth bottlin'. I was thinking I needed to plot something like that to convince coulomb that we need a 2-pole motor, if we are keeping th...
by weber
Wed, 25 Feb 2009, 01:05
Forum: General EV Discussion
Topic: Electric Beemer
Replies: 144
Views: 14937

Electric Beemer

I'd go for the 11kW 4-pole I can buy rather than a 22kW 2-pole I can't buy. Unless you work for ABB and can get us some sort of confirmation that these can be built... Go ask for a quote on the 22kW 2-pole because that would drop striaght in without any mods required albeit somewhat heavyier. Alas,...
by weber
Wed, 25 Feb 2009, 00:48
Forum: General EV Discussion
Topic: Electric Beemer
Replies: 144
Views: 14937

Electric Beemer

Sorry Richo, But it really looks like this. http://forums.aeva.asn.au/uploads/690/BMW_ICEvEV2.GIF I assume this is meant to be a 4-pole 11 kW motor that's 2 times overvoltaged, e.g. a rewound 3GAA 132 005-**E. If so, we haven't allowed for slip in the positioning of the peak. It would really be at a...
by weber
Tue, 24 Feb 2009, 23:16
Forum: General EV Discussion
Topic: Electric Beemer
Replies: 144
Views: 14937

Electric Beemer

Hi coulomb, acmotor, Richo, Johny and woody, (sorry I left Johny and woody off last time) Here are the numbers for all the ABB long 132 frame motors with 4 poles or less. All have 88 to 91% efficiency at nominal power. I've only given the last part of the product code since the first part is 3GAA 13...
by weber
Tue, 24 Feb 2009, 21:45
Forum: General EV Discussion
Topic: Electric Beemer
Replies: 144
Views: 14937

Electric Beemer

The gearbox side [of the rubber coupling] has a splined socket that is about 1.06 " in dia and the motor shaft is 1.125", so I should be able to have it bored out and a keyway cut so it will fit the front motor OK. The driveshaft side just has the tubular driveshaft so that can be cut off and a key...
by weber
Tue, 24 Feb 2009, 21:23
Forum: General EV Discussion
Topic: Electric Beemer
Replies: 144
Views: 14937

Electric Beemer

But I was wondering if there were other reasons to prefer 4-pole over 2-pole; power to weight (as much as 3x?) was mentioned in one thread, for example. Edit: that thread is here . Hi Coulomb, acmotor and Richo, That sounds like a freak of a particular catalog to me. In the current ABB catalog, loo...
by weber
Tue, 24 Feb 2009, 20:23
Forum: General EV Discussion
Topic: Electric Beemer
Replies: 144
Views: 14937

Electric Beemer

Thanks fuzzy-hair-man. Nevilleh, that looks to me like it would work just fine to couple between the motors, provided you do _not_ have any pin in that bush. In the propshaft application, that pin and bush is needed to provide the front support bearing for the first section of propshaft, precisely _...
by weber
Tue, 24 Feb 2009, 19:45
Forum: General EV Discussion
Topic: Electric Beemer
Replies: 144
Views: 14937

Electric Beemer

Thanks for the mounting advice, I'll have a look at that web site. One thought I had was to use another rubber "doughnut" coupler the same as the one that BMW use to couple the gearbox to the drive shaft. I don't think it will take any axial offset at all though. It is self aligning when used with ...
by weber
Tue, 24 Feb 2009, 18:56
Forum: General EV Discussion
Topic: Electric Beemer
Replies: 144
Views: 14937

Electric Beemer

4 pole motors deliver twice the torque of 2 pole motors up to rated speed, for the same power rating motor. Hence twice the starting torque. Hi Johny, That's true for the same power-rating motor, but not for the same size-and-weight motor. In the long 132 frame size in the ABB catalogs, a 4 pole of...
by weber
Tue, 24 Feb 2009, 18:12
Forum: General EV Discussion
Topic: Electric Beemer
Replies: 144
Views: 14937

Electric Beemer

With regard to motor mounting, especially with two motors in line, does anyone have any suggestions as to the best way to do this? I was thinking of making a sold Al frame to fit on the original rubber engine and gearbox mounts and mounting the motors rigidly in this frame. Looks like they would bo...
by weber
Sat, 21 Feb 2009, 09:40
Forum: Technical and conversion discussion
Topic: Direct Drive: Mechanical issues
Replies: 48
Views: 8245

Direct Drive: Mechanical issues

Thanks to everyone for lots of helpful discussion. The funny thing is, I'm coming back to the idea that to get the performance people naturally expect from a sports car like an MX-5/Miata, we're gunna hafta keep the _whole_ gearbox and clutch, despite using an AC induction motor and VF drive and des...
by weber
Sat, 21 Feb 2009, 07:56
Forum: Technical and conversion discussion
Topic: Direct Drive: Mechanical issues
Replies: 48
Views: 8245

Direct Drive: Mechanical issues

Got a reply from Ross Pink. He just greased the slip yoke, so there was no oil inside the gearbox tail/extension housing to bother the e-motor. But he says that isn't a good long term solution. You would at least have to add a nipple so you didn't have to take it apart to regrease. He was more conce...
by weber
Sat, 21 Feb 2009, 07:50
Forum: Technical and conversion discussion
Topic: Direct Drive: Mechanical issues
Replies: 48
Views: 8245

Direct Drive: Mechanical issues

acmotor wrote: Guys, does anyone know the low down on the line up of uni joints on the ends of telescopic drive shafts ?

The two yokes on opposite ends of the shaft have to line up in order to cancel out each other's non-linearities. Pictures here:
http://www.gwb-essen.de/fahrzeugbau/eng ... te_10.html
by weber
Thu, 19 Feb 2009, 18:42
Forum: Technical and conversion discussion
Topic: Direct Drive: Mechanical issues
Replies: 48
Views: 8245

Direct Drive: Mechanical issues

Johny has it right. There is no added bearing and the gearbox tail/extension housing just goes over the shaft and bolts to the adapter plate, exactly as it does on the original gearbox. Woody, the speedo isn't the only reason to use the gearbox tail. As I explained at the start of this thread, there...
by weber
Thu, 19 Feb 2009, 16:22
Forum: Technical and conversion discussion
Topic: Direct Drive: Mechanical issues
Replies: 48
Views: 8245

Direct Drive: Mechanical issues

The purpose of the bush is not to provide a bearing surface, but rather to stop the yoke from getting too much sideways movement on the output shaft. ... The purpose of the bush was not to provide a bearing surface but rather limit the amount of slip yoke sideways movement on the output shaft. The ...
by weber
Thu, 19 Feb 2009, 05:45
Forum: Technical and conversion discussion
Topic: Direct Drive: Mechanical issues
Replies: 48
Views: 8245

Direct Drive: Mechanical issues

that would work , you would need to be careful when you weld the output shaft actually when i think about it you may have trouble with the coupling as you shouldnt use rubber in the oil may need to make a splined coupling which would mostprobably starting to get a little to expensive why dont you u...
by weber
Thu, 19 Feb 2009, 04:05
Forum: Technical and conversion discussion
Topic: Direct Drive: Mechanical issues
Replies: 48
Views: 8245

Direct Drive: Mechanical issues

Here's my best effort so far:
Image
by weber
Wed, 18 Feb 2009, 21:57
Forum: Electric motors and controllers
Topic: AC motors, multipoles, torque
Replies: 549
Views: 68665

AC motors, multipoles, torque

Regarding the 400Hz motor: 270 Nm * 5000 rpm * 2 * pi /60 = 140 kW (peak) So it sounds like field-weakening starts at around 5000 rpm (with 400 V), which might be about 180 Hz (4 pole) allowing for slip. If so, and assuming Tmax/Tn = 3, its performance sounds similar to a 400 V 15 kW (cont.) 60 Hz m...
by weber
Wed, 18 Feb 2009, 18:48
Forum: Electric motors and controllers
Topic: AC motors, multipoles, torque
Replies: 549
Views: 68665

AC motors, multipoles, torque

Here's what I emailed to <info@400hertz.net>: Dear 400Hz, There is some interest at present in your http://www.400hertz.net/Products/ME-400-200-416.htm on the Australian Electric Vehicle Association forum. http://forums.aeva.asn.au/viewtopic.php?p=9229&t=585#p9229 Can you tell us if the 150 kW is a ...