Abstract: An axial flux generator comprising: two magnetic annuli; a coil annulus; the magnetic annuli and coil annulus having a common axis; the two magnetic annuli defining a plurality of magnetic fields around the common axis extending across a gap between the two magnetic annuli and the coil annulus having a sequence of coils around the common axis in the gap such that the lines of magnetic flux from the magnetic fields cut the turns of the coils and this induces electric current in the coils as the magnetic annuli are caused to rotate relative to the coil annulus; wherein each coil has a shape in a plane perpendicular to the common axis where a first position and a second position on the shape are at a radial distance from the common axis that is greater than the radial distance from the common axis of a radially innermost position of the shape by an amount that is at least 60% of the difference in radial distance from the common axis between the radially innermost position and a radially outermost position of the

Abstract: A generator comprising at least one annular stator, the annular stator comprising: an annular plate having an inner circumference and an outer circumference with a series of hollow bosses projecting from a first planar surface of the plate and arranged within and around the outer circumference; and a plurality of coils each located so that a portion is around an associated boss; wherein each hollow boss has an associated recess in a second planar surface of the plate; wherein the generator is constructed and arranged such that the recesses of the hollow bosses are receptive to the induction and passage of cooling fluid in and around the recess.

Abstract: An axial flux rotary generator comprising: two magnetic annuli; a coil annulus; the magnetic annuli and coil annulus having a common axis; the two magnetic annuli defining a plurality of magnetic fields around the common axis extending across a gap between the two magnetic annuli and the coil annulus having a sequence of coils around the common axis in the gap such that lines of magnetic flux cut the turns of the coils and thus induce electric current in the coils as the magnetic annuli are caused to rotate relative to the coil annulus; and at least one first part extending between the two magnetic annuli and at least one second part extending between the two magnetic annuli; wherein the first part is under greater compressive strain than the second part.

Abstract: A generator (10) comprising a series of spaced annular stators (15) sandwiched between a series of rotors (11), the rotors (11) each being separated by annular collars (16), the annular collars (16) defining a central cavity; at least one cooling gas source for supplying gas to the central cavity; vents (23,24,25,26,27,28,31,32,33,34,35) through the annular collars (16) for providing a means of egress for the cooling gas (20) from the central cavity radially outwards over the rotors (11) and the annular stators (15).

Abstract: A generator comprising a series of spaced annular stators sandwiched between a series of rotors, the rotors each being separated by annular collars, the annular collars defining a central cavity; at least one cooling gas source for supplying gas to the central cavity; vents through the annular collars for providing a means of egress for the cooling gas from the central cavity radially outwards over the rotors and the annular stators and the front, rear and side walls of coils embedded in the annular stators.

Abstract: An axial flux rotary generator comprising: two magnetic annuli; a coil annulus; the magnetic annuli and coil annulus having a common axis; the two magnetic annuli defining a plurality of magnetic fields around the common axis extending across a gap between the two magnetic annuli and the coil annulus having a sequence of coils around the common axis in the gap such that lines of magnetic flux from the magnetic fields cut the turns of the coils and thus induce electric current in the coils as the magnetic annuli are caused to rotate relative to the coil annulus, means provided at or towards the central aperture of the coil annulus axial to resist flexure of the coil annulus.

Abstract: An axial flux rotary generator comprising: two magnetic annuli; a coil annulus; the magnetic annuli and coil annulus having a common axis; the two magnetic annuli defining a plurality of magnetic fields around the common axis extending across a gap between the two magnetic annuli and the coil annulus having a sequence of coils around the common axis in the gap such that lines of magnetic flux from the magnetic fields cut the turns of the coils and thus induce electric current in the coils as the magnetic annuli are caused to rotate relative to the coil annulus; characterised in that the coils comprise a wound flat strip conductor.

Abstract: A generator comprises as a first part a stack of disc-like annular rotors spaced one from the other and coaxially located upon and rotating with an elongate central member each rotor having an inner annular portion and an outer annular portion, the outer annular portion bearing and/or comprising a magnetic annulus, one or more spacers being coaxially mounted around the central member in between the inner annular portions of each rotor and abutting against them in such manner such as to brace them to remain orthogonal to the longitudinal axis of the assembly as well as providing the required spacing therebetween, and as a second part, a stack of annular stators interposed between the rotors and mounted over the spacers but having an inner clearance diameter greater than that of the outer diameter of the portion of spacer over which they are located.

Abstract: A generator (10) comprising a series of spaced annular stators (15) sandwiched between a series of rotors (11), the rotors (11) each being separated by annular collars (16), the annular collars (16) defining a central cavity; at least one cooling gas source for supplying gas to the central cavity; vents (23,24,25,26,27,28,31,32,33,34,35) through the annular collars (16) for providing a means of egress for the cooling gas (20) from the central cavity radially outwards over the rotors (11) and the annular stators (15).

Abstract: A direct drive rotary generator formed of an elongate cylindrical series of stator annuli and a coaxial elongate cylindrical series of armature annuli and mounted for relative rotational movement around their common axis, the series of stator annuli interleaving the series of armature annuli, and either of the armature/stator annuli having a contiguous or substantially contiguous sequence of coils around its circumference, and the other of the armature/stator annuli having a corresponding sequence of permanent magnets of alternating polarity spaced around its circumference and at the same pitch as that of the coils, the arrangement being such that lines of magnetic flux passing across the air gap between one magnet carrying annulus to the next cut the turns of the coils of the corresponding interleaved coil carrying annulus, and thus induce in the coils electromagnetic forces as the armature is caused to rotate relative to the stator.

Abstract: A rotary generator comprising: at least one magnetic annulus pair comprising a first magnetic annulus and a second magnetic annulus with a gap therebetween; a coil annulus in the gap; the first and second magnetic annuli and the coil annulus having a common axis; the first and second magnetic annuli of the at least one magnetic annulus pair each having: a sequence of principle permanent magnets spaced around the common axis with alternating north and south poles facing the gap, corresponding principle permanent magnets of the first and second magnetic annuli of a magnetic annulus pair, with unlike poles facing the gap, facing each other across the gap such that lines of magnetic flux cross the gap between the corresponding principle permanent magnets, and a sequence of intermediate permanent magnets, each of the intermediate permanent magnets being positioned between two of the principle permanent magnets, each intermediate permanent magnet having adjacent the gap a north pole facing a side of the principle p

Abstract: An axial flux rotary generator comprising: two magnetic annuli; a coil annulus; the magnetic annuli and coil annulus having a common axis; the two magnetic annuli defining a plurality of magnetic fields around the common axis extending across a gap between the two magnetic annuli and the coil annulus having a sequence of coils attached around the common axis in the gap such that lines of magnetic flux from the magnetic fields cut the turns of the coils and thus induce electric current in the coils as the magnetic annuli are caused to rotate relative to the coil annulus; wherein a relative positioning of individual magnetic fields and a relative positioning of centers and sizing of individual coils in the sequence of coils is such that (i) the electric currents in the individual coils of the sequence of coils are in excess of three phases relative to one another, and (ii) the number of common factors other than one between the number of coils in the sequence of coils and the number of individual magnetic field

Abstract: An axial flux rotary generator comprising: two magnetic annuli; a coil annulus; the magnetic annuli and coil annulus having a common axis; the two magnetic annuli defining a plurality of magnetic fields around the common axis extending across a gap between the two magnetic annuli and the coil annulus having a sequence of coils around the common axis in the gap such that lines of magnetic flux from the magnetic fields cut the turns of the coils and thus induce electric current in the coils as the magnetic annuli are caused to rotate relative to the coil annulus, means provided at or towards the central aperture of the coil annulus axial to resist flexure of the coil annulus.

Abstract: An axial flux rotary generator comprising: two magnetic annuli; a coil annulus; the magnetic annuli and coil annulus having a common axis; the two magnetic annuli defining a plurality of magnetic fields around the common axis extending across a gap between the two magnetic annuli and the coil annulus having a sequence of coils around the common axis in the gap such that lines of magnetic flux from the magnetic fields cut the turns of the coils and thus induce electric current in the coils as the magnetic annuli are caused to rotate relative to the coil annulus; characterised in that the coils comprise a wound flat strip conductor.

Abstract: A rotary generator comprising: at least one magnetic annulus pair comprising a first magnetic annulus and a second magnetic annulus with a gap therebetween; a coil annulus in the gap; the first and second magnetic annuli and the coil annulus having a common axis; the first and second magnetic annuli of the at least one magnetic annulus pair each having: a sequence of principle permanent magnets spaced around the common axis with alternating north and south poles facing the gap, corresponding principle permanent magnets of the first and second magnetic annuli of a magnetic annulus pair, with unlike poles facing the gap, facing each other across the gap such that lines of magnetic flux cross the gap between the corresponding principle permanent magnets, and a sequence of intermediate permanent magnets, each of the intermediate permanent magnets being positioned between two of the principle permanent magnets, each intermediate permanent magnet having adjacent the gap a north pole facing a side of the principle p

Abstract: A generator comprises as a first part a stack of disc-like annular rotors spaced one from the other and coaxially located upon and rotating with an elongate central member each rotor having an inner annular portion and an outer annular portion, the outer annular portion bearing and/or comprising a magnetic annulus, one or more spacers being coaxially mounted around the central member in between the inner annular portions of each rotor and abutting against them in such manner such as to brace them to remain orthogonal to the longitudinal axis of the assembly as well as providing the required spacing therebetween, and as a second part, a stack of annular stators interposed between the rotors and mounted over the spacers but having an inner clearance diameter greater than that of the outer diameter of the portion of spacer over which they are located.

Abstract: An axial flux rotary generator comprising: two magnetic annuli; a coil annulus; the magnetic annuli and coil annulus having a common axis; the two magnetic annuli defining a plurality of magnetic fields around the common axis extending across a gap between the two magnetic annuli and the coil annulus having a sequence of coils attached around the common axis in the gap such that lines of magnetic flux from the magnetic fields cut the turns of the coils and thus induce electric current in the coils as the magnetic annuli are caused to rotate relative to the coil annulus; wherein a relative positioning of individual magnetic fields and a relative positioning of centers and sizing of individual coils in the sequence of coils is such that (i) the electric currents in the individual coils of the sequence of coils are in excess of three phases relative to one another, and (ii) the number of common factors other than one between the number of coils in the sequence of coils and the number of individual magnetic field

Abstract: A direct drive rotary generator formed of an elongate cylindrical series of stator annuli and a coaxial elongate cylindrical series of armature annuli and mounted for relative rotational movement around their common axis, the series of stator annuli interleaving the series of armature annuli, and either of the armature/stator annuli having a contiguous or substantially contiguous sequence of coils around its circumference, and the other of the armature/stator annuli having a corresponding sequence of permanent magnets of alternating polarity spaced around its circumference and at the same pitch as that of the coils, the arrangement being such that lines of magnetic flux passing across the air gap between one magnet carrying annulus to the next cut the turns of the coils of the corresponding interleaved coil carrying annulus, and thus induce in the coils electromagnetic forces as the armature is caused to rotate relative to the stator.

Abstract: A float for use in capturing energy from waves, said float comprising: a central body providing buoyancy, said float further comprising: a leading part which has a leading surface which, in use of the float, is inclined upwards from horizontal such that the top of said leading surface projects further from said central body than the bottom of said leading surface and/or a trailing part which, in use of said float, extends downwards from said central body and presents a trailing surface which is inclined downwards from horizontal such that the top of said trailing surface is closer to said body than the bottom of said trailing surface.

Abstract: A wave energy converter comprising: a linear generator comprising an armature and a stator; a float connected by a linkage to the armature; wherein the weight of the armature and the linkage bear downwards upon the float and one of the armature and stator comprises electrical coils and the other of the armature and stator comprises a stack of permanent magnets, the arrangement being such that during the ascending portion of a passing wave, the buoyancy of the float causes the armature to rise, and as the wave falls away, the combined weight of the float, linkage and armature causes the armature to fall, electricity thereby being generated upon the upstroke and the downstroke, the stack of permanent magnets or electrical coils of the armature being sufficiently sized in terms of deadweight to procure that the combined weight of the armature, linkage and float and any other travelling components act sufficiently against the electromotive force being generated by the linear generator upon the downward stroke to