| 摘要 |
PURPOSE:To eliminate the influence of disturbance and to improve the accuracy in detecting position by detecting the position of a torch from the change in eddy current that arises in proportion to the distance between a torch and a work. CONSTITUTION:When a torch is approached to a work by moving a robot, the magnetic flux by the high frequency from a pickup coil 24 of an oscillating circuit 26 intersects with the work thus generating eddy current in the work. The eddy current is larger as the distance between the work and the torch, i.e., the distance between a sensor 18 and the work is smaller and since the Q value of the coil of the sensor 18 changes, the oscillation frequency of the circuit 26 changes accordingly. The distance between the work and the torch is thereupon determined by detecting the degree of a change in the oscillation frequency. |
