Brushless motor drive will surpass 200 yuan.
Generally, the speed of high-power brushless motor is within 3000 rpm. If the rotor is made into the two poles with the least number of poles, it is estimated that it can reach tens of thousands of revolutions. Due to the increase of frequency, the working voltage needs to be increased accordingly. Ha ha ha, then the control drive part is valuable.
Summary:
The idea is ok, there is no need to do it. If we bring the control part and motor back from the unit, we can study it. But don't give up.
Your idea is whimsical, but it is not a patent.