Is the three phase voltage output from inverse Park / Clarke a "decimal voltage"? Or is it modulated by PWM
The Clarke-Park transform and its inverse convert 3ph to quadrature polar (sin+cos) signals and visa versa so that FOC can be implemented easier for controlling no load speed with voltage and regulating torque with current.  The average voltage and current is modulated by a high frequency duty cycle to regulate speed depending on the load and motor capacity.
Visual explanation. https://www.mathworks.com/solutions/power-electronics-control/clarke-and-park-transforms.html?back=https%3A%2F%2Fwww.google.com%2Fsearch%3Fclient%3Dsafari%26as_qdr%3Dall%26as_occt%3Dany%26safe%3Dactive%26as_q%3DWhat+is+the+Clarke-Park+transform+for+FOC+motors%26channel%3Daplab%26source%3Da-app1%26hl%3Den