| 摘要 |
PURPOSE:To obtain an accurate rotating frequency output by varying the number of one variation of periodic magnetic frequencies in poles of a drive multipolar magnet to 2n times. CONSTITUTION:A frequency generator is formed of a drive multipolar magnet 1' having an irregular portion and a generating coil 5' having generating strands 4'a, 4'b for detecting a periodic change of a magnetic flux. A radial slot 2' is formed on the magnetizing surface of this magnet 1'. In this case, the magnet 1' is formed with slots at an equal pitch so that periodic variations in the magnetic flux of 2n times (n=1,2,...) occur in one pole together with the slots 2', and 180 deg. of an electric angle is displaced to the pitch in the adjacent pole with the boundary of the pole as a reference. Thus, the voltages induced at the strands 4'a, 4'b cancel to each other in the boundary, and only the voltage except the boundary is outputted as a rotating frequency output. |
