Search found 58 matches

by aegidius
Tue, 14 Sep 2010, 00:48
Forum: Technical and conversion discussion
Topic: NCOP14 V2
Replies: 27
Views: 4111

NCOP14 V2

Bikes are specifically not covered under a NCOP13 (section LV) modification for electric drive (code LV1). http://www.infrastructure.gov.au/roads/vehicle_regulation/bulletin/pdf/NCOP13_Section_LV_Alternative_Power_3Feb2006.pdf Electric bikes will be an ICV. NCOP14 does not mention bikes at all. From...
by aegidius
Mon, 13 Sep 2010, 13:00
Forum: Electric motors and controllers
Topic: New Mars motors
Replies: 6
Views: 4346

New Mars motors

Mars Electric sent me this reply to an enquiry about the ME1003. It seems that the brushes were the weak link in the 709 and they have beefed them up. --------------------------------------------------- The ME0709 and the ME1003 motors have the same armature. Armature Resistance is 0.012 Ohms. The d...
by aegidius
Mon, 13 Sep 2010, 02:02
Forum: AEVA QLD Branch
Topic: September Meeting
Replies: 4
Views: 1354

September Meeting

please do!
by aegidius
Sun, 12 Sep 2010, 21:46
Forum: Scooters, mopeds and electric toys
Topic: QUT electric Bike
Replies: 12
Views: 3858

QUT electric Bike

G'day Ron,
Was the bike certified under anything like the current system with QT? Did you need an engineer? I'm on the hunt for one who has certified a bike..

Giles.
by aegidius
Sun, 12 Sep 2010, 21:31
Forum: AEVA QLD Branch
Topic: September Meeting
Replies: 4
Views: 1354

September Meeting

I cannot be there since I've a holiday booked :-) but I would like to see a summary if anyone is taking notes, videoing, or whatever.
by aegidius
Sun, 12 Sep 2010, 21:30
Forum: AEVA QLD Branch
Topic: Motorbike conversion
Replies: 5
Views: 2866

Motorbike conversion

I'd still like to do a bike (in Qld). QT has told me that any bike conversion would be an individually constructed vehicle, but that shouldn't make it impossible. Difficulty would be finding an approved engineer who has certified one. Does anyone know any in Qld?
by aegidius
Wed, 08 Sep 2010, 20:42
Forum: Electric motors and controllers
Topic: AC motors, amping it up. :P
Replies: 58
Views: 9064

AC motors, amping it up. :P

So... in summary, if you take any 3phase motor, and: - rewire it for half voltage by paralleling some windings, and - run it back at its original voltage at double the frequency, you can then pull twice the current at twice the RPM, and get (roughly) 4 times the power? (relative to its nameplate tha...
by aegidius
Sun, 05 Sep 2010, 22:00
Forum: Electric motors and controllers
Topic: Questions and more questions and some back stroy
Replies: 40
Views: 4964

Questions and more questions and some back stroy

Thanks all for the enlightening discussion - much appreciated. I have been reading up on VFD's too, and can see that it's not all that different to BLDC, except for the sinewave thing which means that all 6 mosfets/igbts get the PWM, not just the bottom three. AC motors are interesting beasts, the i...
by aegidius
Sun, 05 Sep 2010, 18:01
Forum: Electric motors and controllers
Topic: New AC controller now available
Replies: 46
Views: 8998

New AC controller now available

Just a question on low voltage and ACIM's - assuming the motor has multiple pole pairs, could you split the windings and reconnect in parallel? Then your Japanese 100V-per-phase motor becomes 50V, or even less if there are more things to connect in parallel. (I assume they are already in delta conne...
by aegidius
Sun, 05 Sep 2010, 17:43
Forum: Electric motors and controllers
Topic: Questions and more questions and some back stroy
Replies: 40
Views: 4964

Questions and more questions and some back stroy

Even a lowly industrial AC induction motor can produce 12x its nominal power at close to its nominal efficiency when driven appropriately. My 11kW 80kg AC motor could produce 132kW (mechanical output) for 60 seconds if I had the batteries/controller. http://forums.aeva.asn.au/smileys/smiley17.gif I...
by aegidius
Fri, 03 Sep 2010, 12:54
Forum: Electric motors and controllers
Topic: Golden Motor - any experience?
Replies: 25
Views: 8876

Golden Motor - any experience?

LightningEV wrote: I had some pics of the motor pulled down somewhere I'll have to post them up, It is of very simple design, almost crude, but very cheap.$.


Please do, I'd like to see that - such info is hard to come by.
by aegidius
Thu, 02 Sep 2010, 23:43
Forum: Electric motors and controllers
Topic: Golden Motor - any experience?
Replies: 25
Views: 8876

Golden Motor - any experience?

What's a 7000B? Do you mean GM's 5000B? The 10K is vaporware then - I'll believe it when I see it (working in a vehicle, that is!) I had a feeling that as the power goes up, the need for sine wave drive is greater - I have built small BLDC controllers before but nothing like 10kW. GM are giving no d...
by aegidius
Thu, 02 Sep 2010, 18:40
Forum: Electric motors and controllers
Topic: Questions and more questions and some back stroy
Replies: 40
Views: 4964

Questions and more questions and some back stroy

I can't for the life of me work out why AC has this blind following... Ok so I get the whole regen thing for what it worth, but from a power to weight perspective AC seems to comes in a poor second. Regen is certainly available to DC drives. OK, it's a bit hard with pure series wound motors, but wi...
by aegidius
Tue, 24 Aug 2010, 19:51
Forum: Electric motors and controllers
Topic: Golden Motor - any experience?
Replies: 25
Views: 8876

Golden Motor - any experience?

Update: the web page http://www.goldenmotor.com/ --> BLDC link has changed. The HPM-10K is no longer "coming soon" but there is still no PayPal link or price for it. I do note that the BLDC controller has changed though - it's now in 300A and 500A versions, with regen. They did tell me there would b...
by aegidius
Thu, 08 Jul 2010, 04:22
Forum: Technical and conversion discussion
Topic: Solutions Knowledge Base
Replies: 20
Views: 2594

Solutions Knowledge Base

I really like the idea of a collection of data that car workshop manuals will not tell you. Things like: - how much particular cars weigh, both tare and GVM - how much the bits you take out weigh - how much room there is for motor - other gotchas, like how to deal with car computers when the engine ...
by aegidius
Thu, 08 Jul 2010, 04:21
Forum: Technical and conversion discussion
Topic: Solutions Knowledge Base
Replies: 20
Views: 2594

Solutions Knowledge Base

.
by aegidius
Mon, 21 Jun 2010, 03:54
Forum: Scooters, mopeds and electric toys
Topic: Ebike Power limits, proposed legislation
Replies: 73
Views: 15378

Ebike Power limits, proposed legislation

So, does this mean that the pedals could turn a generator, making the bike a series hybrid? Andreas Fuchs in Germany has done this (google should find him). It's tricky to get right, and it will never be as efficient as a chain, but it's certainly do-able. But you could not get a free lunch - under...
by aegidius
Fri, 18 Jun 2010, 22:49
Forum: Electric motors and controllers
Topic: Golden Motor - any experience?
Replies: 25
Views: 8876

Golden Motor - any experience?

Price details in $US below. Good value! I asked if he had a rep in Oz but don't expect much - their website lists a bike shop in Blakehurst, NSW who are not answering any emails. If they still exist, they would only have stocked the small hub motors. -------- Original Message -------- Subject: Re: H...
by aegidius
Wed, 16 Jun 2010, 17:48
Forum: Electric motors and controllers
Topic: Golden Motor - any experience?
Replies: 25
Views: 8876

Golden Motor - any experience?

Usually current is along the X-axis, because it's easier to do the motor maths with current as the independent variable. For a PM motor, torque is proportional to current, so it's equivalent to put that on the X-axis as well. The RPM is almost constant because it's a PM motor - a series motor would ...
by aegidius
Wed, 16 Jun 2010, 15:16
Forum: Electric motors and controllers
Topic: Golden Motor - any experience?
Replies: 25
Views: 8876

Golden Motor - any experience?

Performance curves.. the interesting bit is off to the right :-) but I think we can extrapolate. This is for 60V input.
Image

No prices, sorry.
Controller is available for the HPM5000, but this one will need a bit more current capacity.
by aegidius
Wed, 16 Jun 2010, 03:33
Forum: Electric motors and controllers
Topic: Golden Motor - any experience?
Replies: 25
Views: 8876

Golden Motor - any experience?

Emailed Golden motor and got this reply: (I'll upload the curves in a min)

Hi Giles,

The 10KW motor will be available in July.
Attached is the motor performance curve and photo.

Thanks,

Philip Yao

by aegidius
Tue, 15 Jun 2010, 14:20
Forum: Electric motors and controllers
Topic: Golden Motor - any experience?
Replies: 25
Views: 8876

Golden Motor - any experience?

I'd be worried about circulating currents, and all those little relays to go wrong. Also, you probably need all the volts/rpm you can get, to keep the revs down. But it's tempting to have a 2-speed motor.
by aegidius
Sun, 13 Jun 2010, 23:40
Forum: Electric motors and controllers
Topic: Golden Motor - any experience?
Replies: 25
Views: 8876

Golden Motor - any experience?

Interesting large BLDC motor here - water cooled 200A continuous at up to 72V, 600A for 30 sec. Weighs 17kg. Could be a good light alternative to those 80kg+ motors, with water cooling taking care of the low thermal mass that you get with light motors. http://www.goldenmotor.com/ click on BLDC Motor...
by aegidius
Sun, 13 Jun 2010, 23:13
Forum: Scooters, mopeds and electric toys
Topic: Ebike Power limits, proposed legislation
Replies: 73
Views: 15378

Ebike Power limits, proposed legislation

Gow864 wrote:Take our "P" platers, are they forced to drive cars with only 20hp? No, they can jump in daddys prosche if they want to.


Not on bikes they can't. But of course you can get killed just as dead on a learner-legal 250 or a postie bike.
by aegidius
Sun, 13 Jun 2010, 14:55
Forum: Scooters, mopeds and electric toys
Topic: Ebike Power limits, proposed legislation
Replies: 73
Views: 15378

Ebike Power limits, proposed legislation

I was at an EV seminar recently; one of the talks was on electric assisted bikes. I seem to recall that the author stated that Lance Armstrong could manage a peak of about 300 W for short bursts. So if you put in a lazy 50 W of your own power, plus 250 W of assist, you're up at elite racing bike le...