Regarding: [How to improve torque and RPM of a DC motor?](https://electronics.stackexchange.com/questions/43066/how-to-improve-torque-and-rpm-of-a-dc-motor)

Based on the accepted response to the question… in section #1, speed of the motor related to magnet strength, would this would work?

Since RPM varies based on magnet strength, what if the magnets were in an open frame, with each magnet hinged to one side with a spreader screw at the opposite side. If the motor were running off a power supply set to X volts, it seems the RPM would increase if you turned the spreader screw to causing the magnets to open away from the armature like a clam shell (reducing their strength due to distance relative to the armature). I’m not sure this has any practical application, but sounds like it would be cool to see in action.