Linear Induction Basics
Linear induction point absorbers (a.k.a. linear point absorbers) use the same principle of power generation as hydraulic point absorber generators (capturing wave energy using a floating buoy and translating it into electrical energy). However the similarities end there. Hydrualic systems require multiple energy conversions between moving fluids, gears, and generators. Induction power takeoff systems requires only one moving part, a magnetic translator rod, resulting in reduced mechanical complexity and increased efficiency (up to 25%). Another advantage of linear induction systems is that they can be dampened electronically. This means that if the velocity increases rapidly (due to increasing wave height), some energy can be used to increase the resistance of the linear drive and thus generate more electricity (similar to a screen door dashpot). Due to recent cost decreases in the control devices and the advanced materials required to make linear induction generators, it is likely that these systems will become increasingly economically feasible near future.