Patent ID: 9531218
Filing Date: 2016-12-27
CPC Classification: E01F,G08G,H02J

Claim Text:
1. A magnetic force generating device for application to a first object that is movable relative to a second object, the second object providing a first magnetic force, said magnetic force generating device comprising: a controllable power source; a coil to be disposed on the first object, and configured to receive electrical power from said controllable power source; a sensing module to be disposed on the first object adjacent to said coil, and configured to sense a distance between the first object and the second object; a switch module configured to make or break electrical connection between said controllable power source and said coil; and a processor coupled to said controllable power source, said sensing module and said switch module; wherein, when the distance sensed by said sensing module is shorter than a threshold value, said processor is configured to control said controllable power source to generate a driving current having a magnitude negatively correlated to the distance sensed by said sensing module, and to control said switch module to make electrical connection so that the driving current generated by said controllable power source is provided to said coil, said coil generating a second magnetic force in response to the driving current, the second magnetic force being repulsive to the first magnetic force.