An electrical power generator assembly (10a) for using kinetic energy from a flowing fluid (12) to generate electrical power. The electrical power generator (10a) includes a blade assembly (14) and at least one primary coil (52). The blade assembly (14) having a head end (16) for facing incoming flo
An electrical power generator assembly (10a) for using kinetic energy from a flowing fluid (12) to generate electrical power. The electrical power generator (10a) includes a blade assembly (14) and at least one primary coil (52). The blade assembly (14) having a head end (16) for facing incoming flowing fluid (12), a tail end (18) spaced from the head end (16) for facing in the direction of the flowing fluid (12), and a rotational axis (20) extending between the head end (16) and the tail end (18). The blade assembly (14) includes a blade arrangement (44) which is arranged in generally helical fashion about the rotational axis (20), and at least one mounting formation (26, 36) connected to the blade arrangement (44). Each mounting formation (26, 36) is adapted to permit mounting of the blade assembly (14) for rotation about its rotational axis (20), so that in use fluid flowing past the electrical power generator assembly (10a) interacts with the blade arrangement (44) to rotate the blade assembly (14) about its rotational axis (20). The at least one primary coil (52) is connected to the blade arrangement (44) for rotation with the blade arrangement (44). The at least one primary coil (52) is energizable and being arranged in use to interact with at least one stationary secondary coil (54b) to generate electrical power in response to rotation of the blade assembly (14).
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1. An electrical power generator assembly for using kinetic energy from a flowing fluid to generate electrical power, the electrical power generator assembly including: a blade assembly having a head end for facing incoming flowing fluid, a tail end spaced from the head end for facing in the directi
1. An electrical power generator assembly for using kinetic energy from a flowing fluid to generate electrical power, the electrical power generator assembly including: a blade assembly having a head end for facing incoming flowing fluid, a tail end spaced from the head end for facing in the direction of the flowing fluid, and a rotational axis extending between the head end and the tail end, the blade assembly including a blade arrangement which is arranged in a generally helical fashion about the rotational axis, and at least one mounting formation connected to the blade arrangement, the at least one mounting formation being adapted to permit rotation of the blade assembly about the rotational axis when the flowing fluid interacts with the blade arrangement to rotate the blade assembly;at least one primary coil connected to the blade arrangement for rotation with the blade arrangement, the at least one primary coil being energizable and being arranged to interact with at least one stationary secondary coil to generate electrical power in response to rotation of the blade assembly;an elongated open-ended shroud extending between the head end and the tail end, the shroud having a head end section through which the flowing fluid can enter the shroud, a tail end section through which the flowing fluid can exit the shroud, and an elongated intermediate section extending between the head end section and the tail end section, the shroud being connected to and surrounding the blade assembly so that the shroud rotates with the blade assembly; anda stator disposed adjacent the shroud,wherein the at least one primary coil is integrated into the head end section of the shroud and the at least one stationary secondary coil is integrated into the stator. 2. The power generator assembly as claimed in claim 1, wherein the electrical power generator includes a plurality of primary coils, each primary coil being connected to one of the blades at or adjacent the tip of the blade. 3. The power generator assembly as claimed in claim 1, wherein the electrical power includes a current supply electrically connected to the at least one primary coil for energizing the at least one primary coil in order to induce a magnetic field around the at least one primary coil. 4. The power generator as claimed in claim 1, wherein the electrical power generator assembly also includes a current supply electrically connected to the at least one secondary coil for energizing the at least one secondary coil in order to induce a magnetic field which induces a current in the at least one primary coil. 5. The power generator assembly as claimed in claim 1, wherein the electrical power generator includes a plurality of said secondary coils. 6. The power generator assembly as claimed in claim 1, wherein the blade assembly includes an elongated shaft extending between the head end and the tail end, the shaft having a longitudinal axis aligned with the rotational axis of the blade assembly, and the blade arrangement being mounted on and radiating from the shaft. 7. The power generator assembly as claimed in claim 6, wherein the blade arrangement terminates shy of the ends of the shaft, and wherein the at least one mounting formation is provided on an end portion of the shaft, and wherein the shaft and the blade assembly are rotatably mounted or supported by the at least one mounting formation. 8. The power generator assembly as claimed in claim 6, wherein each mounting formation includes a bearing element mounted on the shaft and adapted to be connected to a support structure to permit rotation of the blade assembly relative to said support structure. 9. The power generator assembly as claimed in claim 1, wherein the blade arrangement includes a plurality of beams which are longitudinally spaced in said generally helical fashion along the shaft. 10. The power generator assembly as claimed in claim 9, wherein each beam is mounted on the shaft such that it is adjustably rotatable around the rotational axis of the shaft, to permit adjustment of the pitch of the blade assembly. 11. The power generator assembly as claimed in claim 9, wherein the blade arrangement further includes a web or skin extending along the lengths of and connected to each pair of adjacent beams, such that the blade arrangement, irrespective of the pitch of each beam is uninterrupted across its surface. 12. The power generator assembly as claimed in claim 1, wherein the blade arrangement includes one or more continuous helical blades. 13. The power generator assembly as claimed in claim 1, wherein the blade arrangement, when seen in side elevation, tapers from the head end thereof to its tail end. 14. The power generator assembly as claimed in claim 1, wherein the shroud is connected to a tip of each blade of the blade arrangement, the connection between the shroud and the tip of each blade being substantially impervious to fluid. 15. The power generator assembly as claimed in claim 1, wherein the blade arrangement includes a plurality of beams and said webs or skins, a tip of each web or skin is also connected to the shroud. 16. The power generator assembly as claimed in claim 1, wherein the connections between the webs or skins and the shroud are substantially fluid impervious connections. 17. The power generator assembly as claimed in claim 1, wherein the shroud is of thin wall construction, and converges along at least part of its length from the head end section to the tail end section, the convergence corresponding to the tapering of the blade assembly. 18. The power generator assembly as claimed in claim 1, wherein the shroud is of multi-section or unitary moulded construction. 19. The power generator assembly as claimed in claim 18, wherein the shroud has a circular cross-sectional profile, so that the head end section and the tail end section of the shroud are flared in bell mouth fashion. 20. The power generator assembly as claimed in claim 1, wherein the head end section of the shroud converges towards the intermediate section, and the tail end section diverges away from the intermediate section, such that the shroud is generally in the form of a converging-diverging venturi having a converging elongated throat defined by the intermediate section. 21. The power generator assembly as claimed in claim 1, wherein the power generator assembly includes a slotted ejector arrangement behind the shroud. 22. The power generator assembly as claimed in claim 21, wherein the slotted ejector arrangement is adjacent the shroud tail end section. 23. The power generator assembly as claimed in claim 21, wherein the slotted ejector arrangement is connected to, and rotates with, the shroud. 24. The power generator assembly as claimed in claim 21, wherein the slotted ejector arrangement is not connected to, and does not rotate with, the shroud. 25. The power generator assembly as claimed in claim 21, wherein the slotted ejector arrangement includes a plurality of spaced apart tubular sections. 26. The power generator assembly as claimed in claim 25, wherein the slotted ejector arrangement diverges diametrically away from the shroud. 27. The power generator assembly as claimed in claim 21, wherein the slotted ejector arrangement is of unitary construction, with a helical slot therein. 28. The power generator assembly as claimed in claim 27, wherein the assembly includes a drive means adapted to vary the axial length of the slotted ejector arrangement. 29. The power generator assembly as claimed in claim 27, wherein the assembly includes a drive means adapted to vary the axial length and radial width of the slotted ejector arrangement. 30. The power generator assembly as claimed in claim 1, wherein the intermediate section of the shroud converges from the head end section towards the tail end section. 31. The power generator assembly as claimed in claim 1, wherein the at least one mounting formation includes a bearing element connected to an end section of the shaft, the bearing element being mounted on an anchored support structure to rotate the power generator assembly relative to the support structure. 32. An electrical power generator assembly for using kinetic energy from a flowing fluid to generate electrical power, the electrical power generator assembly including: a blade assembly having a head end for facing incoming flowing fluid, a tail end spaced from the head end for facing in the direction of the flowing fluid, and a rotational axis extending between the head end and the tail end, the blade assembly including a blade arrangement which is arranged in a generally helical fashion about the rotational axis, the blade assembly including an elongated open-ended shroud extending between the head end and the tail end of the blade assembly, the shroud having a head end section through which the flowing fluid can enter the shroud, a tail end section through which the flowing fluid can exit the shroud, and an elongated intermediate section extending between the head end section and the tail end section, the shroud being connected to and surrounding the blade arrangement so that the shroud rotates with the blade arrangement;at least one mounting formation connected to the blade arrangement, the at least one mounting formation being adapted to permit rotation of the blade assembly about the rotational axis when the flowing fluid interacts with the blade arrangement to rotate the blade assembly;at least one permanent magnet connected to the blade arrangement for rotation with the blade arrangement, the at least one permanent magnet being arranged to interact with at least one stationary secondary coil to generate electrical power in response to rotation of the blade assembly; anda stator disposed adjacent the shroud,wherein the at least one permanent magnet is integrated into the head end section of the shroud and the at least one stationary secondary coil is integrated into the stator. 33. An electrical power generator assembly for using kinetic energy from a flowing fluid to generate power, the electrical power generator assembly including: a blade assembly having a head end for facing incoming flowing fluid, a tail end spaced from the head end for facing in the direction of the flowing fluid, and a rotational axis extending between the head end and the tail end, the blade assembly including a blade arrangement which includes a plurality of blades spaced along the length of the rotational axis, and at least one mounting formation connected to the blade arrangement, the at least one mounting formation being adapted to permit rotation of the blade assembly about the rotational axis when the flowing fluid interacts with the blade arrangement to rotate the blade assembly;at least one primary coil connected to the blade arrangement for rotation with the blade arrangement, the primary coil being arranged to interact with at least one stationary secondary coil to generate power in response to rotation of the blade assembly;an elongated open-ended shroud extending between the head end and the tail end of the blade assembly, the shroud having a head end section through which the flowing fluid can enter the shroud, a tail end section through which the flowing fluid can exit the shroud, and an elongated intermediate section extending between the head end section and the tail end section, the shroud being connected to and surrounding the blade assembly so that the shroud rotates with the blade assembly; anda stator disposed adjacent to the shroud,wherein the at least one primary coil is integrated into the shroud head end section and the at least one stationary secondary coil is integrated into the stator.
Baarman, David W.; Bachman, Wesly J.; Lord, John J., Hydro-power generation for a water treatment system and method of supplying electricity using a flow of liquid.
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