| 摘要 |
PURPOSE:To simplify the constitution of the captioned device by disposing electromagnetic coils respectively on the car body and axle sides of a suspension system to supply cyclically variable exciting current to one coil while induced voltage generated in the other electromagnetic coil is detected. CONSTITUTION:Exciting current of sine wave is supplied from an exciting circuit to an electromagnetic coil 1A. Thus, the exciting coil 1A forms a alternating field to generate induced voltage V in an exciting coil 1B. This induced voltage V is determined by the mutual inductance M12 between change amount dI/dt in the exciting current and the exciting coils 1A, 1B, Since this mutual inductance M12 varies with the distance between the coils 1A, 1B, the distance between the coils 1A, 1B, i.e. the displacement of a suspension system can be detected by detecting the change in the induced voltage V accurately with a simple constitution. |
