Search found 3 matches

by skycurve
Jun 04 2018 3:49pm
Forum: Motor Technology
Topic: Lebowski's motor controller IC, schematic & setup, new v2.A1
Replies: 1819
Views: 222320

Re: Lebowski's motor controller IC, schematic & setup, new v2.A1

In INFORM (indirect flux detection using online reactance measurement) some pwm patterns are applied "out of order" of field oriented control and measure the current derivative depending on voltage. This method is much quieter than injecting current waves on imaginary axis (I_imag). Requires your al...
by skycurve
Jun 04 2018 2:43pm
Forum: Motor Technology
Topic: Lebowski's motor controller IC, schematic & setup, new v2.A1
Replies: 1819
Views: 222320

Re: Lebowski's motor controller IC, schematic & setup, new v2.A1

I have read a paper where they used an FPGA to measure the currents @20MHz, but I also think that deadtime is too short and full of noise because of the switching FETs. Than you inject some kind of short pwm pattern like INFORM method and calculate the current derivative, right? Do you have two diff...
by skycurve
Jun 04 2018 1:10pm
Forum: Motor Technology
Topic: Lebowski's motor controller IC, schematic & setup, new v2.A1
Replies: 1819
Views: 222320

Re: Lebowski's motor controller IC, schematic & setup, new v2.A1

That sounds very interesting. This kinda worked but was horribly unreliable and audible noisy to boot So you calculate the rotor position without injecting any pwm pattern and without injecting any "I_imag" (Id) currents? Do you measure the Ld and Lq inductance (anisotropy) while the deadtime and tu...