Endless Sphere

Note that if you have three wires going to motor windings, due to Kirchoff's Current Law, once you know the current in two of the phases, you automatically know the current in the third. My first hybrid (Honda Civic Hybrid) had only two current sensors for the three phase traction motor for that re...

ASI are pretty conservative with their ratings. I ran their bac4000 controller with the 100kv wind of the 8057. Did the auto tune and set up as per the manual and everything worked.

This whole situation has made me tear up and break down more then once, my only option left is to remove everything from the frame and attempt to fit an aftermarket mid-drive setup to the existing mounting holes Unfortunately as you've probably noticed the Bosch motor mounts are non standard and I ...

One question that's bothering the electronics noob that I am: why do vesc require that powerful drv's ? Is that a design choice ? Originally I think Benjamin wanted to reduce the component count and cost to make it easier for users to solder their own vescs from blank pcbs. The drv isn't a particul...

Those are some fine looking boards!

Have you seen the zero speed sensorless HFI (high frequency injection) feature in the latest firmware?

On the vesc you will need to configure it for 0% power at 1ms pulse and 100% power at 2ms pulse. By default it might be something like 0% power at 1.5ms, with 1ms and 2ms pulses giving full power in forward and reverse.

How are you measuring phase current?

I made the switch to Linux this year. Still some games and cad software which need windows. I didn't want to dual boot and didn't like mucking around trying to get them to run well under Linux. I've been running windows in a kvm which seems to give pretty much the same performance as a regular insta...

What I've done on a couple of batteries is just pour epoxy potting compound over the top of the cell holders without any sort of mold. This was over 4 years ago and the batteries have all done fine and it seems it will hold until the cells no longer have useful capacity/IR. The sides of the cells ar...

I'm curious how the no load current looks at higher rpm. The rotor looks quite thin.

Mechanically it looks good though.

If you try all different phase combinations and the phase runner always gives the same "No current on yellow phase" error then problem should be the controller. If the phase runner detects a shorted phase then it disables the mosfets and refuses to drive the motor. Not the case here. I think your ph...

These controllers are smart so all phase combinations are equally valid. Swapping a pair of wires will make the motor run backwards.

It sounds like your motor is fine if it works in sensorless. The ASI controllers are quite sensitive to phase shorts to ground or positive supply, even if its not a dead short. I'm not sure I have really used the halls sensor start-up or not with this set-up because I think I have always gotten this...

Just wondering but why aren't people just buying the controller straight from ASI and getting the included 1 hour programing walkthrough with a controls engineer from ASI? I imagine its just cost. I didn't consider the extra support and bluetooth app of the evaluation kit to be worth $150. I bought...

I've tried a very old version of bacdoor from when Grin first introduced their phase runner and it worked fine with the new bac4000. I asked asi if the new software was ok on old controllers and that too they said was ok, but some objects in the dictionary will be different. No settings went horribl...

If you go to sampled data can you capture the hall sensor values stepping through their six states as the motor turns?

5. Any motor is capable of only so much wattage. Current is what heats up a motor, not voltage. So to maximize motor wattage, run it at higher voltage and less phase current so it heats up less. I feel like this interpretation of voltage and current is where a lot of misunderstanding comes from. Mo...

Bummer DRV dead before you even put any power through the mosfets? Hopefully this new drv is more robust than the 8301/8302.

Cold joint on DRV current sense would cause it. This new DRV is leadless right?

Powervelocity.com wrote: ↑

Oct 16 2019 1:29pm

I am also considering offering a GPS/LTE extension for the BT module and the controller to enable remote features like alarm/tracking and cloud data logging.

Have you seen the most recent version of vesc tool that logs and displays gps/maps along with the usual measurements?

The whopping pole count of 42 means you need a 50000 erpm capable controller just to spin the shaft at 2500 rpm. If you go through some old posts here you will find some tests on large Hobby King outrunners demonstrating extreme core losses at high speed. No idea if this is the case with T-motor but...

How do you like the light pattern? Does it do a good job for you in fully dark situations at say 28 mph? Would a second one (800 lumens total) help? In complete darkness I'm not confident I could avoid all potholes etc at 28mph. More comfortable at 20 mph. Similar situation for off road. I'm sure a...

Just upgraded my front light recently to the following from Grin: Roxim X4 Ebike Light https://www.ebikes.ca/shop/electric-bicycle-parts/lights/roxim-x4-ebike-light.html I've been using that Roxim one for about two years now. Not the brightest light out there but a very sensible output for urban ri...

I haven't used the maytech one but if it is anything like the Flipsky one it means the lid on the case has an O-ring. The pcb itself won't have any conformal coating and water can still track inside the case through the connectors and wires.

What about ditching the extender pack bms and parallelling all the balance connections between the old pack and new. Effectively making one big pack controlled by the Bosch bms, which is presumably of higher quality than the one on the extender pack. It would require modifying the Bosch battery (whi...

Unfortunately on the vesc the brake/reverse mode doesn't function as a cutoff. Instead the commanded motor output is the brake value subtracted from the throttle value. So if you do full throttle and half brake, you will get half throttle. Maybe when you hold both the throttle and brake, the throttl...