Sea wave to electrical energy conversion plant

• US 6,864,592 B1
• Filed: 07/14/2000
• Issued: 03/08/2005
• Est. Priority Date: 07/16/1999
• Status: Expired due to Fees

• Current Assignee: Trident Energy Limited
• Original Assignee: Hugh-Peter Granville Kelly
• Inventors: Kelly, Hugh-Peter Granville
• Primary Examiner(s): Waks, Joseph
• Application Number:
  US10/031,661
• Time in Patent Office: 1,698 Days
• Field of Search: 290/42, 290/53, 417/330, 417/331, 605/01
• US Class Current: 290/42
• CPC Class Codes: F03B 13/1855 where the connection between wom and conversion system takes tension and compression F03B13/187, F03B13/1875 take precedence
• CPC Class Codes: Y02E 10/30 Energy from the sea, e.g. using wave energy or salinity gradient

Abstract

Apparatus for converting the motion of sea wave energy to electrical energy includes one or more float driven linear generators, in which the inertial mass of the float and any linkage means to the linear generator is minimised. In order to generate electrical power consistently upon both the upstroke and downstroke of the float, the moving part of the generator is so sized that its gravitational weight acting upon the float, together with that of the float itself and any intermediate linkage means, is substantially equal to half the total buoyancy of the float.

Claims

1. An apparatus of wave energy to electrical energy power conversion comprising:

at least one linear generator having a stator and an armature which can be linearly driven relative to the stator to generate electrical energy and at least one float linked to the armature by link means and which, in use, is immersed in the sea to be subject to the action of waves to drive the armature, the at least one float, the link means and the armature thereby constituting a wave-driven mass;

wherein the weight of the wave-driven mass is substantially equal to half the upthrust provided by the water displaced by the at least one float(s) when fully immersed in the water, and wherein the contribution to the weight of the wave driven mass of the at least one float and the link means is negligible compared with that of the armature; and

further comprising control means used to regulate the effective load impedance presented to the generator or generators in accordance with the strength of the prevailing wave motion acting upon the at least one float, the regulation being such as to ensure that the electromagnetic damping of the motion of the armature of the or each generator as it generates electricity, is always such as to optimise the generation of power.

2. The apparatus of claim 1, wherein the average horizontal area occupied by the at least one linear generators does not exceed to any material extent the horizontal area occupied by the at least one float and any perimeter space surrounding the at least one float for the effective operation and motion thereof.

3. The apparatus of claim 1, wherein the at least one float is equipped with one or more paddles, suitably contoured, to augment the force of the sea waves acting upon the at least one float.

4. The apparatus of claim 1, wherein the at least one float is so contoured as to minimise any wave latent forces acting upon it, while maximising its buoyancy.

5. The apparatus of claim 1, wherein the stator of the at least one linear generator is maintained stationary and substantially perpendicular to the sea bed, and the armature thereof is affixed directly to the at least one float for traversing the stator in accordance with the motion of the waves acting upon the at least one float.

6. The apparatus of claim 1, wherein the stator of the at least one linear generator is held in a cage above sea level.

7. The apparatus of claim 6, wherein the link to the float is a direct extension of the armature of the at least one generator.