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: 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 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