SOLO Motor Controllers

[regmeister]

I was fed this video today. Someone here may find this company of interest. Mods, please go ahead and delete if already in another thread.
www.solomotorcontrollers.com
"Extremely Low Speed Sensorless control of BLDC/PMSM - High Frequency Injection"

 

[chuyskywalker]

The VESC ecosystem has HFI control mode(s) as well -- just got them within the last year, I think. That said, just like the above, it's ear piercingly bad to use. Maybe this is great for something like a battlebot, where low speed / high torque in a noisy arena is awesome, but....for a lot of what's done around these parts, this would be extremely annoying.

 

[mxlemming]

The VESC ecosystem has HFI control mode(s) as well -- just got them within the last year, I think. That said, just like the above, it's ear piercingly bad to use. Maybe this is great for something like a battlebot, where low speed / high torque in a noisy arena is awesome, but....for a lot of what's done around these parts, this would be extremely annoying.

VESC has 3 HFI modes. There's the old one based on fft and the newer ones based on a tracking pll.

The new ones are much much quieter. With smaller and high performance hardware, the HFI can be run silently.

The solo sounds rather loud by comparison, though i think some of that is due to the speed control loop struggling at such low speed.

I've included HFI in my code base (pll based) for about 1.5 years now, it can be run silent by selecting a PWM frequency above 25khz.