>> On Tue, Dec 13, 2011 at 12:12 AM, Robert Leguillon >> >> >>> 2) Shorting the coil does create a collapsing magnetic field. The time >>> constant of the collapsing field is proportional to the resistance to >>> electrical current. If the shorted coil collapses at just the right speed >>> w.r.t. the disk rotation, it would cause a "push" in the direction of >>> rotation. There could be a higher rpm of rotation at a lower torque value, >>> and only within the narrow band of rotation frequency.
If there is a "right speed" the values start at lower speed limit and range upwards continuously. Thane does not know if there is an upper limit. Harry
