| 摘要 |
The present invention is directed to a downhole apparatus for quickly generating and regulating variable output electric power by varying the alignment of a pair of axially adjacent permanent magnets (84, 82) rotating within an armature (88) having electrically conductive windings. Each of the permanent magnets (84, 82) comprises a plurality of permanent magnetic segments having circumferentially alternating magnetizations. One of the permanent magnets (82) is fixed to the drive shaft (86) and the other permanent magnet (84) is movably mounted on the drive shaft (82) to enable t he alignment or misalignment, as desired, of the magnetizations of the respecti ve magnetic segments on the pair of permanent magnets (84, 82). When the magnetizations are completely aligned, the maximum electrical power is generated in the windings of the main armature (88); conversely, when the magnetizations are completely misaligned, zero electrical power is generated . Thus, the output power is regulated by varying the alignment of the pair of permanent magnets (84, 82), which is accomplished with a drag torque generat or which creates a drag torque that is transmitted to the movable permanent magnet (84) by a torque converter.
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