What is a Variable Frequency Drive?
How does a VFD Work?
What is a VFD? (Part 1)
By: Dave Polka
How Drive Changes Motor Speed
Just how does a drive provide the frequency and voltage output necessary to change the speed of a motor? That’s what we’ll look at next. Fig. 6 shows a basic PWM drive. All PWM drives contain these main parts, with subtle differences in hardware and software components.