| 摘要 |
1,248,773. Transformers. J. MARLOW. 23 Sept., 1968 [2 Oct., 1967], No. 45045/68. Heading H1T. [Also in Division G1] A displacement transducer comprises a ferromagnetic core 11 which includes two overlapping limbs 19, 21 circumscribing the latter of which is a movable short-circuited conductor, 57, mechanically connected to a movable device 35 and between which is an air gap 43. The core is energized from an alternating source 23 by a primary winding 59 in series with the primary 61 of a transformer 63. Movement of the conductor along the flux density gradient causes a variation of opposing magnetomotive force which varies the voltages induced in differential secondary windings 65, 67 and generates a displacement dependent difference voltage which is sensed by a readout device, 69. Alternatively a displacement may be measured from variations of voltage induced in a secondary winding 71. A second displacement may be measured using an additional conductor 22 on the other limb 19. In the embodiment of Fig. 2 the two limbs are arcuate so that short-circuited conductors 109, 110 connected to a rotatable shaft 111 give. a measurement of angular displacement (over a range which is less than 360 degrees) on a readout device connected between terminals 132, 133. A permanent magnet 112 coupled to the shaft induces a voltage, which is a linear function of angular velocity, in a secondary winding 115 wound on a third limb 93, 94, 95, connected to form a continuous flux path with the two arcuate limbs. The embodiment shown in Fig. 3 uses limbs 118, 119 which are concentric annuli and are connected by a limb 120, 121, 122. Angular displacement of a shortcircuit conductor 126 coupled to a rotatable shaft 115 is indicated by variations of voltages induced in differentially-connected secondary windings 129, 130 when the primary winding 123 is energized from an alternating source. |
