[Stiive]

Originally Posted by Arlo

Cool I would like to see the code and some scematics if possible. I can link my BLDC controller thread if you like. I am planning to spend next winter writing code to make it better. I have only just got the code good enough to run it sensored with no feed back (open loop).

Yeh a link would be good. Did you build the hardware yourself?
Im still working on my schematic with all the recent changes i've been making. Will prob put it up soon for feedback

[bjfreeman]

Originally Posted by Stiive

What control method are you using on your current controller? Whats going to be different in the version? Faster sample rate with the new chip?

the throttle is can msgs from the TCM, or the Joystick.
the Motor is half bridge with dual encoder feedback.
It currently has two winding halleffects and temperature sensing.
I want to add more sensing, upgrade to CAN 2.0
Lastly I have to build 3 more, so decided it was time to upgrade. Just could not find the Micro to do it Till the STm32f4

[Arlo]

Here is the link and as you can see its all open and I have had a lot of help. IM still working on it and learning as I can. I have a long way to go but Im to busy to do to much till fall. http://endless-sphere.com/forums/vie...p?f=30&t=30851

[bjfreeman]

I am still editing the page on the controller.
However it will give you an idea and information.

[PStechPaul]

While looking for information about this sort of project, I found the following links which may be helpful.
http://curmot.eie.fceia.unr.edu.ar/M...ol_FOC_DTC.pdf
http://courses.engr.illinois.edu/ece...Sorchini06.pdf
http://www.waset.org/journals/waset/v45/v45-54.pdf
http://iaesjournal.com/online/index....wnload/141/pdf
http://www.idc-online.com/technical_...0Inverters.pdf
http://ljs.academicdirect.org/A12/035_056.pdf
http://www.vnulib.edu.vn:8000/dspace...dev1206-04.pdf
http://icee2007.dei.uc.pt/proceedings/papers/380.pdf

I was thinking of designing my own VFD but I think it is beyond my abilities for anything more than a very simple implementation. So these links are only raw information that may prove useful. Good luck with your project. I will follow it with interest.

[Stiive]

Originally Posted by bjfreeman

you mentioned monitoring voltage. you might find this useful.
http://roadwarrior.free-man.com/can/...anBusway.shtml

Hey mate, can you please explain the working of this volt-meter? Still stumped

[bjfreeman]

Originally Posted by Stiive

Hey mate, can you please explain the working of this volt-meter? Still stumped

it is a current hall effect (100 amp) with two Hall effects on each side to act as voltage sensors.
it is powered by 5volts and gives a 0-2.5 volt output.
the resistors have to be calculated to give a 5-10volt reading across the Hall device at 40ma.
Hope I was clear enough, I have a habit of not explaining fully.

[PStechPaul]

I was also wondering about the voltage sensing for this. From what I can see from the schematic and layout on http://roadwarrior.free-man.com/can/...anBusway.shtml, there are two hall-effect devices on either side of a current sensing coil, and I assume this measures the main DC supply from the battery pack. I don't know the exact voltages and currents involved, but I would imagine at least 400 amps and 600 VDC (240 kW) since IIRC you have something like a 500 HP motor on your RV.

So, my first question would be how the PCB can handle the 400 amps of current. And my second question is the voltage and power rating of the resistors for your voltage sensors. If the hall effect sensors have a 40 mA coil, then the resistors would need to be rated at 600*0.04 or 24 watts, and also must be rated for 600V, which may require several in series.

There are hall effect voltage sensors which operate on 10mA which would reduce the power to 6 watts. http://www.bbautomacao.com/home_hall..._CYHVS025.html

Another question is why it is necessary to measure the input and the output, since there is only the sense coil in between, which should drop only 100 mV or less (and even that is 40 watts).

If you have external shunts or voltage dividers, then I can understand how this might work. But otherwise I, too, am stumped.

[bjfreeman]

There are other Hall sensors that are good to 1000 amps. as I mention. This is meant for a 70 amp charger.
I am about to make the ones for the AC controller that sense the Current in the Bus bars.
it is on my list of lists, of my some, 15 projects I am involved in.
the sensor you reference requires a DC-DC for plus/minus 15v.
I find it interesting that someone worries about 60watts when the system deal with 250KW.
ever see the ceramic wire wound resistors?

[JRoque]

Hi. Last time (many moons ago) I used those Allegro sensors, I ended up soldering the bus wires directly to the sensor terminals instead of using the PCB traces. A direct connection from a bus bar would work well too.

How's the accuracy on those parts? IIRC they use the same part die for the different models and amp it to match the different current handling. That means the higher the current rating, the lower the precision. Could be good enough for the application though.

JR