Patent ID: 8281686

Claim:
An eddy-current actuated balancer, comprising: a barrel for mounting on a spindle of a rotating machine, said barrel comprising a first end, a second end opposite to said first end and a locating wall located on said first end; at least two balancing wheels sleeved onto said barrel, each said balancing wheel carrying a counterweight at a border area thereof; a washer sleeved onto said barrel and set between said balancing wheels; an elastic ring sleeved onto said barrel; a lock ring fastened to the second end of said barrel; and each said balancing wheel carries at least one pulsed magnetic field generator for generating a pulsed magnetic field to act upon the associating balancing wheel, the generated pulsed magnetic field from each said pulsed magnetic field generator comprising at least one vertical component that acts upon the wheel surface of the associating balancing wheel; said at least two balancing wheels, said washer and said elastic ring are clamped between said locating wall of said barrel and said lock ring; said pulsed magnetic field generators are controlled to generate a pulsed magnetic field acting upon said balancing wheels respectively during rotation of said balancing wheels for inducing an eddy current so that the cross product of the respective eddy current and the respective pulsed magnetic field causes formation of a thrust force in a tangent direction reversed to the direction of rotation of said spindle that causes the associating balancing wheel to make an angular displacement.