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An electrical generating system is used for a horizontal directional drilling system. The drilling system has a generally horizontal drill stem that rotates. A generator has first and second components. The first component rotates with the drill stem, while the second component is able to rotate wit

An electrical generating system is used for a horizontal directional drilling system. The drilling system has a generally horizontal drill stem that rotates. A generator has first and second components. The first component rotates with the drill stem, while the second component is able to rotate with respect to the first component. An eccentric mass is rotatably mounted inside of the drill stem and is coupled to the second component, wherein as the drill stem rotates, relative rotational motion is produced between the first and second components and the generator produces electrical power. The eccentric mass is mounted on two spaced apart mounting points inside of the drill stem. The generator provides power to a sonde. The generator is in a housing which has flow channels that allow drilling fluid to flow through the drill stem.

대표청구항 ▼

The invention claimed is: 1. An electrical generating system for use in a horizontal directional drilling system, the drilling system having a generally horizontal drill stem that rotates, comprising: a) a generator having a first component coupled to rotate with the drill stem, and a second compon

The invention claimed is: 1. An electrical generating system for use in a horizontal directional drilling system, the drilling system having a generally horizontal drill stem that rotates, comprising: a) a generator having a first component coupled to rotate with the drill stem, and a second component capable of relative rotation with respect to the first component, one of the first and second components comprising an armature and the other of the first and second components comprising a field; b) an eccentric mass mounted inside of the drill stem and rotatably mounted with respect to the drill stem so that as the drill stem rotates, the eccentric mass can remain stationary; c) the eccentric mass coupled to the second component, wherein when the drill stem rotates, relative rotational motion is produced between the first and second components and the generator produces electrical power. 2. The electrical generating system of claim 1, further comprising a transmission, with an input and an output, the eccentric mass coupled to the transmission input and the second component coupled to the transmission output. 3. The electrical generating system of claim 2, wherein the second component counter-rotates relative to the first component. 4. The electrical generating system of claim 1, further comprising a sonde electrically connected to the generator. 5. The electrical generating system of claim 1, wherein the second component comprises a rotor. 6. The electrical generating system of claim 1, wherein the eccentric mass further comprises two spaced apart mounting points where the mass is rotatably mounted to the drill stem. 7. The electrical generating system of claim 1, further comprising flow channels for drilling fluid flowing through the drill stem. 8. The electrical generating system of claim 1, wherein: a) the second component comprises a rotor; b) the eccentric mass further comprises two spaced apart mounting points where the mass is rotatably mounted to the drill stem. 9. The electrical generating system of claim 1, further comprising: a) a transmission, with an input and an output, the eccentric mass coupled to the second component through the transmission with the eccentric mass coupled to the transmission input and the second component coupled to the transmission output; b) a sonde electrically connected to the generator; c) the second component comprises a rotor; d) the eccentric mass further comprises two spaced apart mounting points where the mass is rotatably mounted to the drill stem. 10. The electrical generating system of claim 1, wherein the eccentric mass is held relatively stationary by gravity as the drill stem rotates. 11. The electrical generating system of claim 1, further comprising an electrical regulator electrically connected to an output of the generator. 12. The electrical generating system of claim 11, wherein the electrical regulator is electrically connected to a load, the regulator connecting the load to the generator output when the generator provides a voltage that exceeds a predetermined threshold.