instaspin-foc vs instaspin-motion

Mustafa Gulec

I plan to design a controller for a Crane-hoist type constant load and require high torque at start-up and require a variable speed profile like an elevator and ride of the load should be bumpless. So what are the differences between instaspin-foc vs instaspin-motion and which should i choose to accomplish my task? I plan to use acim but may use pmsm too, using encoder is not a problem but it would be good to use sensorless option but not a must. Thanks.

over 12 years ago

0 ChrisClearman over 12 years ago

TI__Guru** 119680 points

you should use InstaSPIN-MOTION as it provides better speed control and a low jerk motion profile.

0 Mustafa Gulec over 12 years ago in reply to ChrisClearman

Intellectual 540 points

Ok, thanks. Can I switch easily between them to test? Can instaspin-motion identify motor without rotating it or how much does it require identifying?

0 ChrisClearman over 12 years ago in reply to Mustafa Gulec

TI__Guru** 119680 points

yes, InstaSPIN-MOTION builds upon InstSPIN-FOC.

The general development process is to get the machine running with auto tuned FOC and a non-tuned speed PI. Then you switch to InstaSPIN-MOTION where you use the SpinTAC inertia ID and controller to quickly tune your speed loop. Then you can add movements and create a plan.

The motor identification is optional (you can also just input the values of Rs, Ls, and Flux if known) and requires an un-loaded motor. It does need to spin up to do the flux and Ls measurements. The intertia testing does a quick spin of the motor and requires it to also be un-loaded but it should be coupled to anything that will normally be in the system (gears, drums, etc.).

0 Mustafa Gulec over 12 years ago in reply to ChrisClearman

Intellectual 540 points

Oh I understand better now, thanks. Do I need to know which vector control method is used (e.g. rotor flux oriented FOC, stator flux oriented FOC or DTC etc) since each have them some differences especially from the perspective of motor parameters that must be known. Do these details given in the documentations?

0 ChrisClearman over 12 years ago in reply to Mustafa Gulec

TI__Guru** 119680 points

no, it isn't necessary to understand the details of the method / reference.

yes, the details are given in the documentation.

i recommend following the process outlined in this post

http://e2e.ti.com/support/microcontrollers/c2000/f/902/t/287352.aspx

C2000™︎ microcontrollers

C2000 microcontrollers forum

instaspin-foc vs instaspin-motion