Endless Sphere

For what I know it should work at higher phase current as well, but it will put some demands on the electronics (especially the current sensors). I think it'll be a case of just trying and seeing when and why it fails, and then fix that. At the moment though it will go to the max of my power supply,...

I wish I knew so much about physics, electronics etc. to push things further than global companies like Texas Instruments are capable. Just fyi: I stumbled across a video explaining the TI Instaspin technology, I think I haven't seen it on the forum yet: https://youtu.be/szgVUfyX8JM I looked at thi...

I would love to see this development spread to every available controller as an option. However, I must be realistic when I state that any new development that is useful will be reverse-engineered and copied. So...your first controller model must be the most profitable to you. 48V/52V providing 60A...

1) 4.95V should be enough i its very stable, the chip automatically resets when it drops to 4.5V or so... 2) When the processor starts the first thing it does is look at the setup pin and go either setup or motor mode. After that there is no way to change the mode anymore. The processor starts: this...

Trying it out with my small (I think 4025) RC motor. With phase current and the computer showing the real time (rotor position) phase info. Note how the phase info is continuous and not just 6-stepping. DIIBAARAKss I added some AGC's inside the code to make it easier to try different motors. I tried...

I still haven't finished building the old version of the controller...and now you have started the ideal version of what I'd like to have on the trike. :) Well, I'll finish the ones I have and see how they're doing, then when you finish this design I'll see if there's any way to "patch in" the new ...

Hi Arber, Just to answer your questions: 1) yes it can work with only 1 throttle, in the setup menu you can specify only to use throttle 1 and not throttle 2. 2) I would indeed pull the reset on a fault detection, pull the reset (MCLR) to ground. This puts the chip in reset, a consequence of which b...

cleaned up my table to show the (simple) wiring more clearly. Also strapped it in to try to prevent any motor movement and to measure the pulling power (this is with 15A amplitude phase current again). UsajWB_Yy8E At the end of the video I mention I went all the way to the limit of my power supply, ...

Now I added the capability to run with a (15A) phase current. I set a fixed phase current as there is no throttle connected yet. In the video you can hear me flipping on the 15V/5V power supply (and thus cold-starting the processor). Note how the motor always starts and pulls in the same direction (...

As a main on/off switch I would just completely disconnect the battery. If you just want to shut down the low voltage part, I would interrupt both the high voltage going into the 15V DCDC and also the line where it measures the battery voltage (else it will supply a few mA via this resistor to the 5...

It is all going in the main brain unit...

I had it working with a little bit of phase current about a month ago (before some mayor rework, back then there was still a 50-50 chance of the direction being wrong), there's a video in another thread. I still have to add the capability to drive phase current to this version, and then I'll make a ...

As you may know from another thread, I'm busy developing sensorless start from standstill with full torque. Basically as if the (BLDC) motor had hall sensors or is using a resolver, but without either of these. This is where I am now:

Good info, thanks guys! I'm going to go ahead and put my brain on top. I want as thin of a package as I can get. I started cutting the second copper plate yesterday and will hopefully have it soldered this weekend. Should be rock and roll after that with the other components. Can you post a picture...

You can change the location of the brain board, just make 100% sure all connections are correct and not flipped. You can use a single high watt resistor to drop the voltage into the brain board. I just imagined a bunch of 100 Ohm 0.5W resistors would be the easiest to include in a kit because then e...

a non-EV related picture... not bad for a 750cc ICE (75 mpg in US units)

Watch out, the power rating values are only correct for the 100 Ohm example... with 50mA and the voltage you want to drop you can calculate the required rating. 40V and 50mA means you dissipate 2W, the resistor you use should be able to take this . When using 100 Ohm 0.5 W resistors for instance, yo...

Important remarks: R1: According to lebowskis video one page back this resistor ("tbd") should reduce the battery voltage to around 40 V at ~15 mA. A voltage drop of from 80 to 40V would mean a resistor value of 2.7 kOhm. Value in the kit: 220 Ohm (just a 3V reduction). Is this ok? R2: I think this...

Its a 5V chip (a 33EV from microchip), but for now it is all very early stages. Main thing to see is how it holds up under high throttle...

I have some opamp circuits, mainly to help the ADCs...

No chance... the hardware is just not there

:D my idea for getting full 360 info has worked, now I get reliable info about whether the phase is 0-179 or 180-359. So all combined I now get full 360 degree info (smooth, not just 6 levels) about the rotor position, sensorless at standstill. Processing time is around 10 to 20 msec for the first r...

Just spent 2 days programming, but ran into a problem with the 33EV I'm using... some obscure mistake in the silicon explained in the errata (but who reads those ?). Luckely there's other ways to skin a cat...

I have only a 50W iron, it just takes some time to heat everything up. Main thing to look out for is that the stuff on the opposite side of the board does not de-solder during this long heating time, so I had my L shaped heatsink there to keep things cool (clamped on with some clothes pins)

Is this the method where they measure inductance using the rise time of the current ? Don't you get only a 1 out of 6 info from this (so only 60 degrees resolution) ?

INFORM method ? I dont follow the literature and like to do everything myself, is more fun... at high speed I will switch over to backemf based sensorless of course.