Hi,
at the moment I am wondering about if I need phase voltage sensing for the motor control. I am designing my own hardware with the VESC Software. I will use BLDC mode and Current control. Is it useful to measure the phase voltage or do I need it for the software control? I didn´t find anything yet. Usually traction inverters don´t have phase voltage so I did not find any advantages.
Does somebody have experience with that?
Thanks and best regards,
Flo
No. You need phase voltage sense. Everything uses phase voltage sense. Why do you want to remove some resistors? Traction inverters have phase voltage sense but you're welcome to post schematics of (working) ones that don't.
Usually you just measure phase current because that´s what you control. I only want to aks if the software is working without phase voltage sense.
Just look at some reference designs (TI, Wolfspeed Cree...) e.g.https://www.ti.com/lit/ug/tidueg8a/tidueg8a.pdf?ts=1612343530717&ref_url...
I had a deeper look at how field weakening would work once it is supported by the VESC project and I could not find a use for voltage sensing for that use case either. I am assuming that voltage sensing will allow one to calculate the effective drive efficiency or help with regenerative braking, but I am merely brainstorming about it, I am not sure of this.