Welcome to college.

+Texas Instruments Many thanks. I wish to have a flexible system that will allow me to close the loop on my motion controller instead of servo drive which is a common practice. Can InstaSPIN or Design Drive suite be applied in robotics or CNC applications? How well AC induction motor compares with brushless DC in applications requiring precise positioning? Kind regards, Nikola

+Nikola Radakovic InstaSPINcomes in two basic variations; InstaSPIN-FOC and InstaSPIN-MOTION. Both implement a field oriented control algorithm. We typically see InstaSPIN-FOC used with sensorless applications, and InstaSPIN-MOTION used with sensored systems. Another way to look at the differences is that InstaSPIN-FOC is used primarily for speed control applications, and InstaSPIN-MOTION is used for position control applications. So for robotics and CNC applications, it sounds like InstaSPIN-MOTION might be a better fit. In regards to AC induction motors in position control applications, they can be a little more complicated to control due to the slip between rotor and rotor flux. As long as you use a shaft sensor, this solution can be implemented. However, I typically see permanent magnet machines used for servo applications (especially in sub-horsepower applications) due to the increased power density and smaller size possible.

+Texas Instruments I read your Users Guide InstaSPIN-FOC and InstaSPIN-Motion. Might I notice that Piccolo processor used in InstaSPIN is a MIPS one core CPU. In order to implement slave motors or parallel kinematics, I unfortunately don't see a way to apply simultaneous multitreading. Time slice threading on one core would cause inconsistent timing. As a result parallel axis would compete and cause internal strains like in a case of delta robot or gantry mill where we have two or more motors driving the same axis at the same time. However, I would like to ask you a few questions related to SpinTAC API , more precisely SpinTAC Plan . My idea is to make a post processor for G-Code and translate it for InstaSPIN . As far as I understood , you use a state machine for motion control.So in my case of G-Code, to move from a point A to point B I need to create two configuration states using a function STPOSPLAN_addCfgState(ST_POS_PLAN_Handle, int32_t, _iq24,int32_t) . Every transition from point n to point n+1 requires additional state. In that case my SpinTAC Position Plan would leak the memory of your CPU. Is it possible to load a position plan from external memory? What are the units of second and third argument of function STPOSPLAN_addCfgState(ST_POS_PLAN_Handle, int32_t, _iq24, int32_t) ? Documentation states that these two parameters are called PostStepInt_mrev and PostStepFrac_mrev.How do we determine the values of PostStepInt_mrev and PostStepFrac_mrev ? Many thanks, Nikola

+Texas Instruments Where is Dave Wilson's 10 part series and mathematical proof papers? I cannot find them on site www.ti.com/motorblog.

TI bought LT before this vid

Do you really need any extra resolution for this presentation?

@@DehimVerveen 2yrs later, please ask him that question again

@@DehimVerveen Another summer came and went and we're still waiting for the answer. Miguel, give us a sign of life! For the love of Christ!

+Nikola Radakovic Dear Nikola, Read chapter 34, Electrical Technology book, authored by Theraja

e2e.ti.com/support/archive/motor/m/spice

Thanks for your question. The simulation program used was LTSpice.

Where can we get the slides?

May we know, why u are using LT Spice rather than Tina

LT Spice is built from the ground up to deal with discontinuities. Therefore, LT Spice is great for this since it uses PWM signals.

Thank you! You should follow any guidelines from your instructor on what style to use to list video resources. Good luck!

it doesn't convert! in fact these signal haven't any unit. these are just numbers that we define and label

Hi Kieran: Our experts in the motor drivers E2E community may be able to help with questions on FOC. e2e.ti.com/support/applications/motor_drivers/

Yes, the net current has to be zero. Whatever is entering through phase A and B MUST come out of phase C. If not there would be charge accumulation.

I agree net current is zero then "Is" value is zero all the time .How it can drive the motor then ?

When you plug something on the wall, on your socket the net current is also zero. What comes through one cable leaves through the other. Still you can use the fridge, laptop, etc.. Make sure you understand that first

Oh right one of them serves as a return path after load.. didn't strike at that moment..Thank you.

i think you can

I think the post part in clip is some description of sensorless vector control, In case they didn't have rotor position sensor to tell the angle at all. Or may be he use estimated angle from calculation as a feed forward angle in model observer. Actually say, he make use estimated rotor angle to calculate desired torque current instead of real angle from rotor sensor as an excuse that sensor always give lagging value on anytime. So he forwarding estimated it and use them instead.