Low inertia direct drive drawworks
First Claim
Patent Images
1. An active heave compensation system for use on a floating drilling platform, the active heave compensation system comprising:
- a travelling block, the travelling block coupled to a drill string, the travelling block positioned to be raised or lowered by the extension or retraction of a wireline;
a drawworks, the drawworks positioned to extend or retract the wireline, the drawworks including;
a drum, the drum coupled to the wireline, and positioned to extend or retract the wireline as the drum is rotated;
a shaft, the shaft coupled to the drum;
a permanent magnet AC motor, the permanent magnet motor including;
a stator, the stator including a plurality of windings, the windings positioned to induce a rotating electromagnetic field into the interior of the stator; and
a rotor, the rotor positioned within the stator, the rotor including a generally cylindrical, hollow rotor body and a plurality of permanent magnets, the permanent magnets coupled to the periphery of the rotor body, the rotor body coupled by one or more extensions of the rotor body directly to the shaft, the rotor positioned to be rotated by the interaction of the rotating electromagnetic field induced by the stator and the permanent magnetic field of the permanent magnets; and
an active heave controller, the active heave controller positioned to control rotation of the drawworks.
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Abstract
A low inertia permanent magnet motor includes a stator and rotor. The rotor includes a generally tubular and hollow rotor body coupled to the shaft of the motor by one or more spokes and/or webs. The permanent magnets of the rotor are coupled to the rotor body. In some embodiments, the low inertia permanent magnet motor may be used to power a drawworks. In some embodiments, the drawworks may be controlled by an active heave compensation controller.
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Citations
13 Claims
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1. An active heave compensation system for use on a floating drilling platform, the active heave compensation system comprising:
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a travelling block, the travelling block coupled to a drill string, the travelling block positioned to be raised or lowered by the extension or retraction of a wireline; a drawworks, the drawworks positioned to extend or retract the wireline, the drawworks including; a drum, the drum coupled to the wireline, and positioned to extend or retract the wireline as the drum is rotated; a shaft, the shaft coupled to the drum; a permanent magnet AC motor, the permanent magnet motor including; a stator, the stator including a plurality of windings, the windings positioned to induce a rotating electromagnetic field into the interior of the stator; and a rotor, the rotor positioned within the stator, the rotor including a generally cylindrical, hollow rotor body and a plurality of permanent magnets, the permanent magnets coupled to the periphery of the rotor body, the rotor body coupled by one or more extensions of the rotor body directly to the shaft, the rotor positioned to be rotated by the interaction of the rotating electromagnetic field induced by the stator and the permanent magnetic field of the permanent magnets; and an active heave controller, the active heave controller positioned to control rotation of the drawworks. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A drawworks for use on a floating drilling platform, the drawworks comprising:
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a drum, the drum coupled to a wireline, and positioned to extend or retract the wireline as the drum is rotated; a shaft, the shaft coupled to the drum; a permanent magnet AC motor, the permanent magnet motor including; a stator, the stator including a plurality of windings, the windings positioned to induce a rotating electromagnetic field into the interior of the stator; and a rotor, the rotor positioned within the stator, the rotor including a generally cylindrical, hollow rotor body and a plurality of permanent magnets, the permanent magnets coupled to the periphery of the rotor body, the rotor body coupled by one or more extensions of the rotor body directly to the shaft, the rotor positioned to be rotated by the interaction of the rotating electromagnetic field induced by the stator and the permanent magnetic field of the permanent magnets. - View Dependent Claims (9, 10, 11, 12, 13)
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Specification