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CCS/LAUNCHXL-F28069M: Instaspin sensored vs sensored audible noise and smoothness of motion

Uladzimir
Intellectual 470 points
Part Number: LAUNCHXL-F28069M


Tool/software: Code Composer Studio

We are working on platform that sways in horizontal plane by sine law assignment. It must move silently and smoothly.
Right now we have incremental encoder on motor shaft and experimenting with the sensorless control too. We are wondering, what is difference comparing sensored vs sensorless control in meaning of:
1) audible noise - which method tends to making louder noise?
2) smoothness of motion - which method tends to be smoother?

We realize that much depends on how well the system is tuned in both cases (PI regulators etc), but still, is there at least theoretical difference?

  • 0
    TI__Guru** 115500 points
    As you mentioned, the rotor position is from FAST estimator in sensorless-FOC, and is from the position sensor in sensored-FOC. The sensored-FOC should often have a better position control performance than sensorless-FOC scheme.
    1). As talked above, sensored one should be a good choice.
    2). The same as 1), sensored one is better.

    Please have a look at the instaSPIN user's guide, it has a more detailed description of the difference to two schemes and theoretical description.