Recent content by SRFirefox

Have you had any beta testers successfully integrate an Axiom board with unique inverter electronics? I've been messing with some hybrid vehicle inverters and getting my feet wet with Axiom for the price of the control board and some time learning to interface it to a Prius seems like a good and...

Serious piece of kit there. I'd be interested to see what an Axiom with 1200V switches could do with it - last I read the control board isolation was good for 800V bus. Are the spinning cases integrated into the motor or is there a shaft behind them? The example motor you linked is an in-runner...

Congrats! I look forward to seeing it mounted on a bike! :D

It could be for a magnet on a shaft or wheel to do revolution counting. If you connected it to the phase output and it wasn't up to the voltage it may have broken that particular sensor. Measure the point with a multimeter when it's not connected to anything. If it's at logic high it probably...

This is a very cool project, and I have some ideas that this will be perfect for. In the short term, the SS looks like just the ticket for my smaller e-bike projects. Does the ENNOID-BMS-SS work without enabling or installing the main MOSFET/Contactor? I have a project right now that could use...

Very cool! Is the field weakening firmware based on the Power Designs experimental branch of the VESC firmware?

The QS 138 70H is a popular choice and those who use it say it's very torquey. As torque is a product of current, any appropriate controller that runs on 48V should be able to max out its torque potential just fine. It will just run at a proportionately lower power/rpm than at it's rated 72V...

I've been thinking about this on and off and after a little digging, found a thermal conductivity figure for Kapton of .12W/m*K. Inexpensive thermal pad I've seen around has a conductivity of 1-2W/mK. Based on these numbers, a .5-1mm thick piece of ordinary silicon thermal pad has the same...

Believe it. If you don't believe me, ask around with some of the folks with higher speed bikes how many Wh it takes to go a kilometer at different speeds. Air resistance above a shockingly low speed - the rule of thumb appears to be 25mph/40kph - becomes the dominating system loss. If you don't...

I've read bits and pieces of the InstaSpin documentation, and I think there's support for overmodulation built into it. How much faster that would make a motor spin I don't know, but it might account for what you're talking about.

I think you're confusing energy per speed and energy per distance. It takes more energy for unit distance to go faster due to the poor aerodynamics that you will get on any motorcycle unless it is completely covered in a fairing or shell. 25Wh/km is the energy usage per kilometer at low speed -...

That's good to know too, but I can't figure out how to acquire one, as much as trying to specify one. It's not listed in the BOM on the Hackaday blog or anywhere else that I've been able to find.

Out of curiosity, how does Axiom get the cold plates specified for operation? This is one of the obvious (to me) advantages of buying a pre-built Axiom, but I can think of other uses of the manufacturer's cold plates as well.

So I've had a couple DRVs fail (not unexpected with my messing around), but I seem to be having the issue that when I reach 40ish amps phase @50% duty that my DRVs throw faults. As in all the faults. My test motor is a mid-monster that I'm running as a self-contained dyno to test the Cheap...

Thanks for the offer, Amberwolf, but unfortunately the meter would be cheaper than a trip to meet you. Much appreciated!