Search found 37 matches

by widodo
Jun 23 2010 12:19am
Forum: Motor Technology
Topic: When to go from PWM to Block coil commutation ?
Replies: 9
Views: 1143

Re: When to go from PWM to Block coil commutation ?

Okay sounds logical to me . LFP thanks for pointing out max allowed battery current completely forgot about that. Another question : How long does the commutation last from point A to B ? Because we have the varying duty cycle PWM at less than full throttle or a single full block-pulse at full thro...
by widodo
Jun 22 2010 9:36pm
Forum: Motor Technology
Topic: e-Buggy: Alternator Conversion
Replies: 145
Views: 47332

Re: e-Buggy: Alternator Conversion

... Anybody managed to fit halls to alternators? Because sensorless start-up is no good for a 40kg vehicle! .. I did, while it was on the advance side and on a fixed location, my Car ESC still working OK, thought you could clearly see that it now running warmer. You could see how it was done from p...
by widodo
May 11 2010 7:39pm
Forum: Motor Technology
Topic: e-Buggy: Alternator Conversion
Replies: 145
Views: 47332

Re: e-Buggy: Alternator Conversion

Last night (on work :D ) I've found interesting patent related to automatic field weakening, using discrete electronic parts (it's from 1980.!). Think that widodo is using something similar, but with processor. :shock: Wow, Unfortunatelly, I was still 10 years old that days and the Internet was onl...
by widodo
May 09 2010 6:52am
Forum: Motor Technology
Topic: e-Buggy: Alternator Conversion
Replies: 145
Views: 47332

Re: e-Buggy: Alternator Conversion

Windtalker, I found that my Rotor saturates at around 5-6 volt. Hence, I supposed after that you will only gets temp increase rather than flux increase. Still your experiment with 40V supply really draw my interest (My ESC only supports 4S), Please do update us on the top RPM for a 5V rotor, and 40V...
by widodo
May 08 2010 5:29am
Forum: Motor Technology
Topic: e-Buggy: Alternator Conversion
Replies: 145
Views: 47332

Re: e-Buggy: Alternator Conversion

IIRC the timing advance is depending on momentary RPM and load: the higher the RPM the more timing advance is necessary for the best output. I believe the sensored infineons may have an auto-advance algorithm, because I felt some small vibrations comming from the motor under certain conditions and ...
by widodo
May 08 2010 5:09am
Forum: Motor Technology
Topic: e-Buggy: Alternator Conversion
Replies: 145
Views: 47332

Re: e-Buggy: Alternator Conversion

Krumpi, windtalker & Olaf, thanks for the input. Anyway, installed the motor today, but the bench test shows that though the torque is big, it does takes quite some amps and makes my 25C 3S lippo warm up quite rapidly :shock: (this quite old battery hence might be one of the reason together with the...
by widodo
May 05 2010 12:28am
Forum: Motor Technology
Topic: e-Buggy: Alternator Conversion
Replies: 145
Views: 47332

Re: e-Buggy: Alternator Conversion

Slight advancing halls is a way to make motor to achieve higher speeds, but current rises, and running in reverse is problematic, because phase shifting comes too late. Advancing is used on rc models, running in one direction, but I think it's not for us on ev. I've used dremel-like tool to make sp...
by widodo
May 03 2010 7:18pm
Forum: Motor Technology
Topic: e-Buggy: Alternator Conversion
Replies: 145
Views: 47332

Re: e-Buggy: Alternator Conversion

Fligh High: It's Atmel product alright, I see that it has 3 external interrupt already, so you could connect Hall directly to them. Anyway, I see that you only have 2 timer for PWM, I supposed the 128 also support the a/b 8 bit pwm out in its timer. Just make sure that all Interrupt support level ch...
by widodo
May 02 2010 9:54pm
Forum: Motor Technology
Topic: e-Buggy: Alternator Conversion
Replies: 145
Views: 47332

Re: e-Buggy: Alternator Conversion

If I am at the building stages will open a new topic here at motor-conversions "Fligh High's alternator motor conversion experiments" :D Maybe people will find it interesting....As I said before think this will be a good year for Alternator-conversions , hopefully we will all have some good and fun...
by widodo
Apr 30 2010 7:45pm
Forum: Motor Technology
Topic: e-Buggy: Alternator Conversion
Replies: 145
Views: 47332

Re: e-Buggy: Alternator Conversion

Widodo; I took my camera this morning, but only got one shot before the batteries were flat. Spare set of batteries were for wife's camera and did not fit. Overall length is 46cm. Weight @ 55KGs. Sorry for the imperial tape. Could not find metric tape this morning. Wow :shock: :shock: ! look at tho...
by widodo
Apr 28 2010 7:36pm
Forum: Motor Technology
Topic: e-Buggy: Alternator Conversion
Replies: 145
Views: 47332

Re: e-Buggy: Alternator Conversion

That is for the nominal voltage of Li-ion 3.7V but it is higher than nominal when fully charged. What I heard is that you shouldn't runn them over 30V it worked with two lead acid in series on video I think just to be save you could just cut down the ESC shrink-wrap, detach the heat-sink and confir...
by widodo
Apr 28 2010 12:41am
Forum: Motor Technology
Topic: e-Buggy: Alternator Conversion
Replies: 145
Views: 47332

Re: e-Buggy: Alternator Conversion

I'm back :D @Magnus: Welcome, hope you could work your alternator as directed by daj @dajsinjo: congratulation, seems the 200A controller works flawlessly, perhaps we should list down all the controller that has been proved to be working. Do you have any problem in starting it up ?, what is the lowe...
by widodo
Apr 15 2010 6:47pm
Forum: Motor Technology
Topic: e-Buggy: Alternator Conversion
Replies: 145
Views: 47332

Re: e-Buggy: Alternator Conversion

You could just monitor "Mixing" from the motor RPM (for the unsesored version, need to install a magnet in the pulley), in my case, I believe this is safer compares with the current monitor through the shunt resistor and needs shorter instruction in the programming side. Anyway, I'll have to go, but...
by widodo
Apr 13 2010 9:10pm
Forum: Motor Technology
Topic: e-Buggy: Alternator Conversion
Replies: 145
Views: 47332

Re: e-Buggy: Alternator Conversion

Hello! This is my first post, and I am not trying to steel your thread. I've converted small alternator last summer, but it's still on the table, I have no time to build a vehicle for it. If I saw correct, your (Mr Widodo) hall-sensors are in the "claws" of the stator. My sensors are between claws ...
by widodo
Apr 11 2010 10:42pm
Forum: Motor Technology
Topic: e-Buggy: Alternator Conversion
Replies: 145
Views: 47332

Re: e-Buggy: Alternator Conversion

Hi Widodo , said I would keep you company well here I am :wink: Good to see that you have made some progress ! And nice to see that people are still interested in a alternator-motor conversion here at Endless-sphere. Unfortunately I've had very litlle time these past two weeks to look into the elec...
by widodo
Apr 11 2010 7:42pm
Forum: Motor Technology
Topic: e-Buggy: Alternator Conversion
Replies: 145
Views: 47332

Re: e-Buggy: Alternator Conversion

Thanks Guys, Your material use is inspired. I had considered using perf board and ic sockets but didn't know it it were feasible. With care, you should be able to go from prototype to use. I will look at cell phones with different eyes - not as irritating annoyances but as raw materials for use. Cou...
by widodo
Apr 11 2010 12:38am
Forum: Motor Technology
Topic: e-Buggy: Alternator Conversion
Replies: 145
Views: 47332

Weekly Update

After a whole week long waiting for the component to arrives from Singapore, Finally the Home Made Controller is up and run now. :D :D Still with all three passes running perfectly, Torque ripple still quite noticeable which in turns limit the maximum achievable RPM, Initial suspect was : 1. there a...
by widodo
Apr 06 2010 11:22pm
Forum: Motor Technology
Topic: e-Buggy: Alternator Conversion
Replies: 145
Views: 47332

Re: e-Buggy: Alternator Conversion

We constructed 50 or more 110VAC output devices from many different brands of alternators. Just a switch to interrupt the power to the rotor. The AC voltage was controlled by rpm. Too many people put heavy loads on this system and complained after burning out their alternators. It's true, we had qu...
by widodo
Apr 06 2010 9:45am
Forum: Motor Technology
Topic: e-Buggy: Alternator Conversion
Replies: 145
Views: 47332

Re: e-Buggy: Alternator Conversion

I removed the brushes and regulator. IF you go Permanent magnet, it will be difficult to keep the slip rings from being destroyed. I got readings up to 14 V, but, I have the 3 delta windings seperated. Might be why I got low readings, and, the belt kept jumping off. That's my safety overspeed prote...
by widodo
Apr 06 2010 9:27am
Forum: Motor Technology
Topic: e-Buggy: Alternator Conversion
Replies: 145
Views: 47332

Re: e-Buggy: Alternator Conversion

Widodo, My readings lead me to believe that the mosfet bridge is a two-way bridge and one of the things you have to watch out for is regen into a full battery. Isn't electronics fun. Just look at Live for Physics' video of blowing shit up :mrgreen: http://www.youtube.com/watch?v=dree0rTr1HM Ha ha.....
by widodo
Apr 06 2010 5:22am
Forum: Motor Technology
Topic: e-Buggy: Alternator Conversion
Replies: 145
Views: 47332

Re: e-Buggy: Alternator Conversion

Widodo, I am wondering about the regen possibilities with varying the rotor voltage. It would be logical that increased voltage would increase the generated voltage. I am going to spin the altermotor up with another motor and check the output while varying the rotor voltage. It will give me somethi...
by widodo
Apr 05 2010 6:30pm
Forum: Motor Technology
Topic: e-Buggy: Alternator Conversion
Replies: 145
Views: 47332

Re: e-Buggy: Alternator Conversion

What are you going to do with the current induced in the winding, from passing through the flux created by the stator, when your coil is not energized? Will you not have a troubling voltage to deal with? The controller energized the rotor as a function of stator power, high excitation for start up ...
by widodo
Apr 05 2010 6:08pm
Forum: Motor Technology
Topic: e-Buggy: Alternator Conversion
Replies: 145
Views: 47332

Re: e-Buggy: Alternator Conversion

Something that interests me about those PMAs is the large gaps between the magnets. That seems to me to be plenty of space to add coils around the permanent magnets. I need to first find out how the flux of a permanent magnet behaves with a coil wrapped around it. If with current in the proper dire...
by widodo
Apr 04 2010 8:18pm
Forum: Motor Technology
Topic: e-Buggy: Alternator Conversion
Replies: 145
Views: 47332

Re: e-Buggy: Alternator Conversion

Widodo, I have been closely following your posts both here and at RCGroups and am working on building a controller. I have the stator bridge fairly well figured out but am undecided on how to drive the rotor. Thanks for all your info. Thanks Salty, means a lot knowing that I'm doing a good thing, a...
by widodo
Apr 04 2010 7:43pm
Forum: Motor Technology
Topic: e-Buggy: Alternator Conversion
Replies: 145
Views: 47332

Re: e-Buggy: Alternator Conversion

John, you really make my day :D , really glad that it could help you out Anyway, If I may, I would like to take you back to the reasoning why alternator (as it is) really interesting for me as an "electronically and mechanically challenged" person before going out into PMA. 1. Torque and Rpm: Confir...