DC motor PI current control block not connecting

Hi everyone,

I am trying to implement PI current control of a DC motor. I was using the controlled PWM voltage block and H-bridge for the same. I am unable to connect the output of the PI block to the input of the PWM block. I thought it may be because the output of the PI will have units of A and the PWM block was set of voltage. I tried connecting a resistor but again the wire was not connecting them. There is an option for 'unit expression' in the pwm block but I have no clue as to what should be written in there. Could anyone pl explain to me where I am going wrong?

Answer 1

[Arkadiy Turevskiy]

The output of PI Controller block is the Simulink signal, but the inputs of Controlled PWM Voltage block are Physical Signals- more on the difference here .

You need to convert Simulink signal to Physical Signals to connect two blocks. This example show exactly what you need to do - both in terms of connecting the blocks (look into Feedback Controller subsystem) and in terms of how to tune PID gains.