While I was trying to find the gain (K constant) of a motor, I gave different voltages to see if I will have the same gain constant in each of them.
While doing it, I come through an issue. When I vary the voltage directly from the power supply the motor rotates at the right speed, for example: if I change the voltage from 24V to 12V, the motor speed drops exactly to the half. However, if I do the same thing with the PWM (ie: give PWM = 50% ) the motor rotates at a higher speed than the half value.
Has anyone have an explanation for this? this is crucial as the PWM will be used to control the motor speed and position.
Thank you for your help.