Systems and methods for determining proper phase rotation in downhole linear motors
AssigneeBaker Hughes Holdings LLC
InventorRenato L. Pichilingue
Life of this patent
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Abstract
Systems and methods for determining proper phase rotation in a linear motor that may be used in an ESP system, where the phase rotations associated with power and return strokes are initially unknown. The method includes providing power to the motor for multiple cycles and monitoring the load (e.g., by monitoring current drawn by the motor) on the motor to determine in which direction (phase rotation) the load on the motor increases. This direction corresponds to the power stroke of the motor. The direction of increasing load is then associated with the power stroke and the motor is operated normally.
Claims11
A method for determining proper phase rotation in a linear motor, wherein phase rotations associated with power and return strokes are initially unknown, the method comprising:
- providing power to a linear motor, wherein the power drives the motor for a plurality of cycles, wherein each cycle includes a stroke in which a mover of the motor moves in a first direction and a stroke in which the mover moves in a second direction which is opposite the first direction;
- monitoring a load on the motor during the plurality of cycles;
- determining, for each of the first and second directions, whether the load on the motor during the strokes in the corresponding direction increases over the plurality of cycles;
- if the load on the motor during the strokes in the first direction increases and the load on the motor during the strokes in the second direction remains substantially constant, associating the first direction with a power stroke and associating the second direction with a return stroke;
- if the load on the motor during the strokes in the second direction increases and the load on the motor during the strokes in the first direction remains substantially constant, associating the second direction with the power stroke and associating the first direction with the return stroke;
- and
- provide power to the linear motor having respective power output characteristics associated with the power stroke and return stroke.
A method for determining proper phase rotation in a linear motor, wherein phase rotations associated with power and return strokes are initially unknown, the method comprising:
- providing power to a linear motor, wherein the power drives the motor for a plurality of cycles, wherein each cycle drives a mover of the motor in a stroke in a first direction and a stroke in a second direction which is opposite the first direction;
- monitoring a load on the motor during the plurality of cycles;
- identifying one of the first and second directions for which the load on the motor increases during corresponding strokes over the plurality of cycles;
- if the load on the motor during the strokes in the first direction increases, providing power to the linear motor having power stroke characteristics during strokes in the first direction and providing power to the linear motor having return stroke characteristics during strokes in the second direction;
- and
- if the load on the motor during the strokes in the second direction increases, providing power to the linear motor having power stroke characteristics during strokes in the second direction and providing power to the linear motor having return stroke characteristics during strokes in the first direction.
A method for determining proper phase rotation in a linear motor, wherein phase rotations associated with power and return strokes are initially unknown, the method comprising:
- providing power to a linear motor, wherein the power drives the motor for a plurality of cycles, wherein each cycle drives a mover of the motor in a stroke in a first direction and a stroke in a second direction which is opposite the first direction;
- monitoring a load on the motor during the plurality of cycles;
- identifying one of the first and second directions for which the load on the motor remains substantially constant during corresponding strokes over the plurality of cycles;
- if the load on the motor during the strokes in the first direction remains substantially constant, providing power to the linear motor having return stroke characteristics during strokes in the first direction and providing power to the linear motor having power stroke characteristics during strokes in the second direction;
- and
- if the load on the motor during the strokes in the second direction remains substantially constant, providing power to the linear motor having return stroke characteristics during strokes in the second direction and providing power to the linear motor having power stroke characteristics during strokes in the first direction.
Dependencies are inferred from the claim text.