Electricity: motive power systems – Automatic and/or with time-delay means – Speed or rate-of-movement
Reexamination Certificate
2005-09-06
2005-09-06
Ro, Bentsu (Department: 2837)
Electricity: motive power systems
Automatic and/or with time-delay means
Speed or rate-of-movement
C417S024000, C175S101000
Reexamination Certificate
active
06940245
ABSTRACT:
A downhole compressor system is disclosed for assisting in extracting gas from the well. The system comprises a compressor14, an electric motor10for driving the compressor14which motor has a stator winding and a rotor12and, in use, is lowered into the well together with the compressor. A control system18, which when in use is disposed outside the well, is connected to the stator winding for controlling the current supply to the motor10. The control system18receiving a signal indicative of the speed and phase of the rotor from a feedback sensor16mounted for rotation with the rotor12. In the invention, the feedback sensor is a current generator having a permanent magnet16amounted for rotation with the rotor12and a second stator winding16bconnected to the control system18.
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Scarlet Jeremy Adam
Sidey Roger
Corac Group PLC
Fleit Kain Gibbons Gutman Bongini & Bianco P.L.
Gibbons Jon A.
Messulam Alec
Ro Bentsu
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