Bldc/ foc / hyrid

This is where you may discuss Electric Skateboard ESC/VESC Speed Controllers.
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Posts: 6
Joined: Wed Aug 02, 2017 4:53 pm

Bldc/ foc / hyrid

Post by Jack » Thu Aug 03, 2017 7:17 am

I just want to make sure I have a thorough understanding of these modes.

BLDC - tried and proven. No sensors needed. Might have to kick start as it will cog from standstill

FOC - quiet. Less too speed compared to bldc. Smooth start no need to kickstart. Might not work on 12S???

Hybrid - best of both worlds. Should work fine on 12S.

Am I correct here?

Posts: 12
Joined: Tue Aug 01, 2017 1:27 pm

Re: Bldc/ foc / hyrid

Post by Hillso » Thu Aug 03, 2017 7:18 am

FOC doesn't mean no kick start, maybe a bit of a less kick. For me, it's less noise and just a better riding feel to me.

Hybrid requires hall effect sensors in your motor. It runs BLDC, not FOC. At a certain erpm, which you can set, it will turn off the sensors. The reason is a pure sensor mode is inefficient at higher speeds. Sensor are only there for low speed torque. So hybrid mode fixes this.

FOC though, if ran in sensored mode, will do the same thing as hybrid, but in FOC, instead of BLDC.

Posts: 9
Joined: Thu Aug 03, 2017 7:09 am

Re: Bldc/ foc / hyrid

Post by Glider » Thu Aug 03, 2017 7:27 am

I'll say what I know for sure

BLDC and FOC can both be sensored or unsensored and the first two have nothing to do with the latter
Hybird or Sensored modes NEED sensors
BLDC has an audible hum while accelerating and braking
BLDC switching frequency is much lower than FOC (which is why FOC is more likely to blow your VESC
Your likely-hood of blowing your VESC on FOC increases with higher eRPM. This is why hubs are great for 12s FOC as their kv is typically lower than belt setups

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