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ACI Scalar Control in Low Speeds

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Hi Everyone,

I have a question related with Encoder speed measurement. I have a quadrature encoder in my system and I read the speed successfully. But there are only 60 teeth on motor side. Therefore I have little problem while reading low speeds and this problem affect my motor control at low speeds.

I am using f28377d in my control card and I am trying to control Induction Machine with v/f control. Does anyone have any suggestion to improve the control at low speeds?

To read the low speeds successfully,  I tried to make register change in my control loop i.e. I set the QCAPCTL.UPPS register to 2 at start , and then change it to 4 when it goes over 120rpm. But in c2000 forum it is said that it is a bad idea that change the register dynamically. 

Any comment would be appreciated.

Thank You


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