초록 ▼

A downhole compressor system is disclosed for assisting in extracting gas from the well. The system comprises a compressor 14, an electric motor 10 for driving the compressor 14 which motor has a stator winding and a rotor 12 and, in use, is lowered into the well together with the compressor. A cont

A downhole compressor system is disclosed for assisting in extracting gas from the well. The system comprises a compressor 14, an electric motor 10 for driving the compressor 14 which motor has a stator winding and a rotor 12 and, in use, is lowered into the well together with the compressor. A control system 18, which when in use is disposed outside the well, is connected to the stator winding for controlling the current supply to the motor 10. The control system 18 receiving a signal indicative of the speed and phase of the rotor from a feedback sensor 16 mounted for rotation with the rotor 12. In the invention, the feedback sensor is a current generator having a permanent magnet 16a mounted for rotation with the rotor 12 and a second stator winding 16b connected to the control system 18.

대표청구항 ▼

1. A downhole compressor system for assisting in extracting gas from the well, the system comprising:a compressor; an electric motor for driving the compressor, wherein the motor has a stator winding and a rotor and, in use, the motor is lowered into the well together with the compressor; a control

1. A downhole compressor system for assisting in extracting gas from the well, the system comprising:a compressor; an electric motor for driving the compressor, wherein the motor has a stator winding and a rotor and, in use, the motor is lowered into the well together with the compressor; a control system connected to the stator winding for controlling the current supply to the motor, which control system, in use, is disposed outside the well; and a feedback sensor mounted for rotation with the rotor for supplying to the control system a signal indicative of the phase and speed of rotation of the rotor, characterized in that the feedback sensor is a current generator having a permanent magnet mounted for rotation with the rotor and a second stator winding disposed in the motor and connected to the control system. 2. The compressor system as claimed in claim 1, wherein the control system further comprises:means for comparing an amplitude of an output signal of the generator with a reference amplitude at a same rotor speed and a known temperature, to provide an estimate of a temperature of the rotor. 3. The compressor system as claimed in claim 2, wherein the generator is operative to produce a sinusoidal output signal having a frequency that is a whole number multiple of a frequency of rotation of the rotor; and wherein the system further comprises:means for comparing at least two amplitudes of signal cycles generated during a same revolution of the rotor in order to detect vibration of the rotor. 4. The compressor system as claimed in claim 3, wherein the motor comprises a permanent magnet mounted on the rotor.5. The compressor system as claimed in claim 3, wherein the motor is selected from a group of motor types consisting of AC Motors, DC Motors, Brushless DC Motors, Servo Motors, Brushed DC Servo Motors, Brushless AC Servo Motors, and Stepper Motors.6. The compressor system as claimed in claim 2, wherein the motor comprises a permanent magnet mounted on the rotor.7. The compressor system as claimed in claim 2, wherein the motor is selected from a group of motor types consisting of AC Motors, DC Motors, Brushless DC Motors, Servo Motors, Brushed DC Servo Motors, Brushless AC Servo Motors, and Stepper Motors.8. The compressor system as claimed in claim 1, wherein the generator is operative to produce a sinusoidal output signal having a frequency that is a whole number multiple of a frequency of rotation of the rotor; and wherein the system further comprises:means for comparing at least two amplitudes of signal cycles generated during a same revolution of the rotor in order to detect vibration of the rotor. 9. The compressor system as claimed in claim 8, wherein the motor comprises a permanent magnet mounted on the rotor.10. The compressor system as claimed in claim 8, wherein the motor is selected from a group of motor types consisting of AC Motors, DC Motors, Brushless DC Motors, Servo Motors, Brushed DC Servo Motors, Brushless AC Servo Motors, and Stepper Motors.11. The compressor system as claimed in claim 1, wherein the motor comprises a permanent magnet mounted on the rotor.12. The compressor system as claimed in claim 1, wherein the motor is selected from a group of motor types consisting of AC Motors, DC Motors, Brushless DC Motors, Servo Motors, Brushed DC Servo Motors, Brushless AC Servo Motors, and Stepper Motors.