| 摘要 |
A method and device for position control of the working organ (12) of a downhole actuator (1), the actuator (1) being connected to a gripper (2) and placed in a borehole (8), and the working organ (12) of the actuator (1) being moved by means of a screw and nut connection (20, 22) driven by a motor (24), and the method comprising: - connecting a transmitter (28) to the actuator (1), the transmitter (28) being arranged to measure, directly or indirectly, the rotary angle of the screw (22); - connecting the transmitter (28) to a control unit (30), the control unit (30) being arranged to receive a set value for how far the working organ (12) is to be moved and, on the basis of the set value, to control the motor (24) to rotate in the desired direction until, on the basis of signals from the transmitter (28), the control unit (30) calculates that the set value has been reached; - setting a set value; and - seeing that the set value is reached. |
