| 摘要 |
PURPOSE:To permit the correct detection of the position of a movable piece and a speed signal by a method wherein the row of magnetic detecting element in a series, in which the direction of the flux of the permanent magnet of an operating polarity coincides with the direction of flux generated in a flat coil itself by the conduction of electric current, is selected in accordance with the moving direction of a linear motor to detect it as the position of the movable piece or the speed signal. CONSTITUTION:When a permanent magnet 22 approaches a Hall element 16a in the non-conducting condition of a flat coil 11 upon moving a movable piece 20 into a direction F, for example, the vertical component of flux on the Hall element 16a becomes equal to the vertical component of flux generated from the permanent magnet 22 because the flat coil 11 itself is in the non-conducting condition and flux is not generated. Accordingly, the Hall element 16a is made ON. Next, when the permanent magnet 22 approaches the Hall element 16b under the non-conducting condition under non-conducting condition of the flat coil 11, the vertical component of the flux on the Hall element 16b becomes equal to the vertical component of the flux from the permanent magnet 22. Accordingly, the Hall element 16b is made ON. |
