Speed Control of BLDC Motor using PWM with Drive Cycle

For PI Speed Control we need a Controlled Voltage Source but for PWM Speed Control we didn't need a Controlled Voltage Source

The BLDC motor can be controlled using a PI controller but we need a controlled voltage source for this. But using PWM speed controlled we didn't need a controlled voltage source [we can also use Battery directly]. I have given the ECE-15 drive cycle and check its correctness.