BLDC Design 102

[safe]

The "twin" idea...

Very, very good... run two motors at high efficiency and not have to spin at ridiculous rpms makes gearing a lot easier too.

Two MY1020 750 Watt motors should be just about right. Throw in "Boost Control" so that you can at times run at high efficiency and at others you can run at high power.

Total weight 20 lbs... price about $160... nice...

 

[eP]

Yes, we are coming back to eP's earlier proposal: one motor with high efficiency at high-loading, another motor with high efficiency for the flats.

Use one, the other or both...

No TD we are not coming back. We have two parallel ways for two different kinds of vehicle.

Entry vehicle - 2 motors as smaller hub couldn't be enough efficient at wide range of speed (5-40 mph)

Advanced vehicle - 1 motor but very high efficient at nominal power out (above 96% ). Such motor could be still very efficient even at 1/8 nominal rpm (above 80%), so it is quite enough for driving or assistance at high grade slope (+10%).

PS. You didn't buy clever jew story about $10k inverter i hope :wink:
If you don't know i have to explain - jews hate us even more than Arabs i'm sure.

 

[eP]

The "twin" idea...
...
Two MY1020 750 Watt motors should be just about right. Throw in "Boost Control" so that you can at times run at high efficiency and at others you can run at high power.

Total weight 20 lbs... price about $160... nice...

Two high rpm motor is not very good idea as all the time one set of gear must work.
If you use one geared and one hub gearless most of the time silent hub is working at flat and low grade slope. Noisy geared you use at rare high grade slopes.

 

[TylerDurden]

E-Bicycles do not care about race, religion or country, neither do I.

E-Bicycles will make a difference for one planet.

Two motors on the bike are good for today, a single motor in the lab is good for tomorrow.

There are many good brains here, but we waste cpu-cycles arguing about worse, when we can talk about better.


:?

 

[eP]

E-Bicycles do not care about race, religion or country, neither do I.

E-Bicycles don't care, but jew members can't stop to show us theirs hate to Poles even at this forum as you can see above.
I suppose you don't speak polish so you couldn't read all above.

E-Bicycles will make a difference for one planet.

Two motors on the bike are good for today, a single motor in the lab is good for tomorrow.
:?

You are wrong.
A single motor was in lab 15 years ago and 10 years ago on the road.
So now well designed single motor is what we need and what we can do.
Strong magnets are many times cheaper now than 15 or 10 years ago.

 

[TylerDurden]

Randy (ebikemaui) has made a good motor.

I would like to make one too, but I don't know how yet.

Randy has shared many good tricks and he might show us some more... please?

 

[Miles]

Just came across this

http://www.itek.co.il/samot/map.swf

 

[Lowell]

200kg? Plus rider, or including rider? I don't think there's anywhere to put so much weight. I weigh about 80kg... why do you need to carry so much? 2 people on 1 bike?

So all or most cars in Canada are only 1 seat place ?
How do you think: why people (abroad of Canada) driving 4-5 seat autos mostly ?
Or didn't you know that ?

If you're going to ride for pleasure only, why go electric? That would imply the whole bike is an extra expense.

For longer range, for health (easy high grade climbing ), for pleasure again, for more independence on the road (high power always ready - human power is far less than horse power ).

If money is tight, spending $ on putting an electric motor on a bicycle doesn't make much sense. I'd be figuring out ways to make more money...

Yeah i see the best way is working in Canada at $60 per hour

Two wheel vehicles don't solve traffic problems? That's news to me, because if I'm on my bike, that means one car is parked in the garage. As for hospital stays, I don't know how much they cost per day as Canada has a very good health care system. $54/mo covers 1 person.

http://www.health.gov.bc.ca/msp/infoben/premium.html

Yours cementary system is very good too i suppose
Churchyards have enough area. We all going to that place at the end, but i see you want to go there a little bit faster (+50 mph ) :lol:

I'm trying to picture 2 x 100kg dudes on an ebike with 600W.... :lol:
I suppose since my rear rack is rated for 75kg someone could ride on the back, but she certainly wouldn't be over 60kg! What do 4 and 5 seat cars have to do with bikes?

BC is not a bad place to live, and there's a high demand for tradesmen right now. Seems as though people want cushy IT jobs these days, and nobody wants to do 'real' work anymore. But if you are smart you can make money anywhere in the world. One of my customers that we did an 850hp Supra and 425hp supercharged S2000 for makes $$ from internet porn.

50mph going to put you into the grave? Who are you, Ralph Nader?

 

[TylerDurden]

HEY... leave my buddy Ralph outta this mess... he may be a kook and a prick, but we have safer cars now. Nobody's perfect.

I've owned numerous Corvairs (even 400+hp), and it became a good car after Ralph trashed its early versions. Too bad GM had the same shitferbrains with the 'Vair as they did for the EV1.

 

[Toorbough ULL-Zeveigh]

The problem wasn't with the Corvair. It was with drivers not knowing how to properly control a vehicle with a rear weight bias. During the Fiero's run every winter I saw at least 3 of them wrapped around a pole. That's because when a mid/rear engine car begins to slide whether it's at high speed on dry pavement or low speed on ice the worst thing you can do is drop throttle in a panic. It only causes the car to spin out of control. Ralphie-boy totally missed the mark, blaming a convenient scapegoat by focusing on some minor teething problems with the Corvair to launch his career.

 

[EbikeMaui]

Randy (ebikemaui) has made a good motor.

I would like to make one too, but I don't know how yet.

Randy has shared many good tricks and he might show us some more... please?

Motor stators and housings are made by the millions all around the world for cheap that could be made into MORE efficient ebike motors. The "good trick" is in figuring it out by reading more.To find the best stator and rotor for it's use! Add three 75 cent hall sensors in the right place and hook up the wires to the right controller and batteries correctly and your set! You won't figure it out unless you read more. All you need is right here already pasted all over the net. try PM rotors. A rotor is not so hard to make if you have a CNC mill , a design and a chunck of steel.
http://www.ee.kth.se/php/modules/publications/reports/2004/IR-EE-EME_2004_006.pdf
Rotor design #2 is what I have used mostly but the field strenth can be improved by using less magnet material with less core material= even stronger, more efficient, with less weight at less total costs.

 

[EbikeMaui]

Randy (ebikemaui) has made a good motor.

I would like to make one too, but I don't know how yet.

Randy has shared many good tricks and he might show us some more... please?