Convert step output to sine output

Question

Aldiaz Nabil Faekar 2015-5-17

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/217158-convert-step-output-to-sine-output

回答： Marcos Gritti 2015-5-17

Hi, does anyone knows how to convert step to sine waves? its going to used on dc motor positioning. i used arduino simulink for run the motor. i have trouble for its acceleration. errors comes high then the motor cannot accelerate smoothly. Then i have to convert the errors/PWM from high variables to "incremental" variables without losing to much rise time(represent with red line). maybe this pictures can describe clearly. anyone have the solution about this?

All the answers will be appreciate. Thanks alot

Aldiaz

2 个评论
显示无隐藏无

Image Analyst 2015-5-17

Do you have to start with the step, or can you just generate the sine wave with sin() immediately and not even worry about creating the step function?

Star Strider 2015-5-17

Yours is actually a linear control problem. You need a mathematical model of your motor, and then design your control system around it to meet your requirements.

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

Marcos Gritti 2015-5-17

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/217158-convert-step-output-to-sine-output#answer_179433

在 MATLAB Online 中打开

If i don't misunderstood, you want to smooth the input signal to the motor? If it is, you can add a low pass filter between the signal source and the motor.

function output = lowpassfilter(input, tau)
persistent lastvalue;
    if isempty(lastvalue) || isnan(lastvalue)
        lastvalue = 0;
    end
    dt = 0.1;
    lastvalue = lastvalue*(1-dt/tau) + dt*input/tau;
    output = lastvalue;
end