Download e-book for kindle: Industrial Control Technology by Peng Zhang

By Peng Zhang

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Changes in the magnetic field cause the bridge voltage to be deflected. This voltage is amplified and supplied to a Schmitt trigger after conditioning. If the effective signal reaches an adequate level, the output stage is set accordingly. The sensor is used for the noncontact rotational speed detection on ferromagnetic sensing objects such as gearwheels. The distance between the sensed object and the surface of the active sensor is described as air gap. The maximum air gap is dependent on the geometry of the object.

12 The Hall effect. them to one side of the conductor. This is most evident in a thin, flat conductor as illustrated. A build up of charge at the sides of the conductors will balance this magnetic influence, producing a measurable voltage between the two sides of the conductor. The presence of this measurable transverse voltage is called the Hall effect, after E. H. Hall who discovered it in 1879. Note that the direction of the current I in the diagram is that of conventional current, so that the motion of electrons is in the opposite direction.

Because the performance of an RVDT is essentially similar to that of a transformer, excitation voltage changes will cause directly proportional changes to the output (transformation ratio). However, the voltage out to excitation voltage ratio will remain constant. 5% typically has no effect on sensor accuracy and strict voltage regulation is not typically necessary. Excitation frequency should be controlled within ±1% to maintain accuracy. 2 Application Guide The following factors should be considered when selecting an LVDT (AC, alternating current; DC, direct current): (1) (2) (3) (4) measurement range armature type AC–AC vs DC–DC environment.

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