Powerfull motor 90A or 150A alternator ?

[dudewheresmycar]

Hi, I have e-bike that now using a car alternator 90A bosch, winding is 1,6mm of copper, magnets are 12pcs of 35x7x2mm, the diameter of stator is 104mm. I have constant 2kW of power, but i want more. I found on junkyard 150A alternator, but copper winding is 1,5mm and internal resistance is double than 90A alternator that iam using now. But the diameter of stator is bigger, 112.45mm. Question is, would i get a bigger power from 150A alternator if the magnetic circuit at 150A alt is bigger ? Or no, i will get less power than 90A because internal resistance of coils is double.
Thanks, and sorry for my english, i am Czech

 

[Nobuo]

Good question, by my very small experience on this, I guess it depends basically on how much copper it is in each alternator and the power of the magnets,
a pair of photos of each one would be helpful

 

[dnmun]

how can you use an alternator for a motor? do you have a picture of this device and has it been tested to evaluate the power it puts out? how do you commute the phases and how did you handle the wiring to the diodes?

 

[parabellum]

Do you have pictures(external/internal) ? Haven't seen the first car alternator originally comming with PMs.
Have dealt with modified rotor type, for wind mill.
To dnmun: Diodes go out and you get simple 3 phase motor as result, not very efficient BTW.

 

[dudewheresmycar]

some photos of project are there : http://stepus68.rajce.idnes.cz/E-kolo

 

[dnmun]

like way cool. very original for this place but i guess this conversion is more well known in other places.

i can see you are using a 3 phase invertor so the trick is to work out the wiring sequence for the phase wires. is the invertor home made also?

i could see where you were comparing the wire gauge in the stator. the difference is almost imperceptible. neat work.

add your location to your avator. always nice to have a log chain to lock the bike to. or is that for the dog? he pulls the car. car looked lightweight too.

 

[dudewheresmycar]

thanks, no its power stage from 200A china rc regulator + hobbyking 40A bldc sensorless controller mcu, I am using 2pcs of lipo 6s 5Ah, i have them in paraler so i have 22,2V 10Ah, Motor power is about 2kW constant power at 45Celsius, current is about 110A...
difference in wire gauge is at 90A alt is 1,7mm, at 150A alternator is 1,5mm and there is more teeth, more turns of winding thats why 150A have a double internal resistance than 90A alternator so, if i will use same magnets for 150A alternator, power will be less or more ?

 

[parabellum]

thanks, no its power stage from 200A china rc regulator + hobbyking 40A bldc sensorless controller mcu, I am using 2pcs of lipo 6s 5Ah, i have them in paraler so i have 22,2V 10Ah, Motor power is about 2kW constant power at 45Celsius, current is about 110A...
difference in wire gauge is at 90A alt is 1,7mm, at 150A alternator is 1,5mm and there is more teeth, more turns of winding thats why 150A have a double internal resistance than 90A alternator so, if i will use same magnets for 150A alternator, power will be less or more ?

I don't think those 2 things go together, higher R and higher current. Those values usually move in oposite direction.

 

[bigmotherwhale]

I am trying to use a 190amp water cooled alternator as a motor as well, i took it apart and to my surprise it has perm magnets fitter on the armature as well as coils!

well that expalins why it spins up without power to the armature coil

this is the first one i have ever seen like this.

its a really nice alternator and the motor phase wires are 4mm diameter, 0.1 ohms measured unreliably on a multi meter its probably more like 0.1ohm

it looks more like a PM magnet motor inside than an alternator - the lamination's are very thin and it is covered in heat transfer silicone. which means i cant see whether its star or delta.

 

[parabellum]

I am trying to use a 190amp water cooled alternator as a motor as well, i took it apart and to my surprise it has perm magnets fitter on the armature as well as coils!

well that expalins why it spins up without power to the armature coil

this is the first one i have ever seen like this.

its a really nice alternator and the motor phase wires are 4mm diameter, 0.1 ohms measured unreliably on a multi meter its probably more like 0.1ohm

it looks more like a PM magnet motor inside than an alternator - the lamination's are very thin and it is covered in heat transfer silicone. which means i cant see whether its star or delta.

Interesting. Can you post some pictures? What is the gen brand and model? Where is it used in?

 

[bigmotherwhale]

sure here they are

http://s936.photobucket.com/user/bigmotherwhale/slideshow/alternator

 

[parabellum]

sure here they are

http://s936.photobucket.com/user/bigmotherwhale/slideshow/alternator

Thanks. Where is this generator used in? 12V system?

 

[bigmotherwhale]

yes it is 12v water cooled and its made by hitachi. for Audi Q8