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design problem faced on PWM brushless motor speed control

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By using a frequency to voltage converter, I got the DC voltage for varying speed on motor. Now, I am going to design the rest for by varying loading of the motor, difference speed will appear. I would like to maintain the constant speed by varying the loading.
How can I design the error amplifier and the rest circuit (i mean the feedback path only).
As I know to varying the speed on motor, I can varying voltage on the negative input of PWM comparator. So, I can use the feedback of the Freq. to DC. converter output the feed into that input to control.
For the open loop speed control, I think that there should have no problems. But how can I design the error amplifier and the rest for the close loop design? Any professional guy can help me.

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