A With A Displacement Sensor Feedback Servo Mechanism Hall

The sensitive device of magnetism is moved in the magnetic field with gradient, it can reflect the situation moved to export. The output of Hall's component and wired sexual relations of the intensity of magnetic induction:In the type: VH is the voltage of output of Hall's component, SH is the sensitivity of product of Hall's device, B is the intensity of magnetic induction, / is for flowing in control electric current of Hall's component Control electric current / invariable for the time being as magnetic field for even gradient magnetic field, export VH produce displacement of magnet steel of magnetic field and on Hall component on direct radio. So can amount of displacement measured comes with Hall1 s component It has small inertia, respond and wait for the characteristic quickly, except that Hall must move with the unit under test in succession component, There are not other activity parts, so can avoid the disadvantages, such as frictional force, mechanical breakdown, etc., Adapt to doing the on-the-spot trends to test very much. But can keep even gradient magnetic field range strong, Hall's component can only measurement displacement among a small circle (usually only about 1mm). And should keep the magnetic field with even gradient in measuring the area, its magnetic field is designed complicatedly. This has restrained Hall's components from measuring the application of displacement to a great extent. If can utilize Hall's component to measure displacement under the condition of the simple magnetic field, Increase the range of measuring; It inertia little, merit that exposed to make it function in the measurement of vibration and in various kinds of displacement, become a kind of displacement sensor with fine performance .It can solve this difficulty to adopt the feedback servo mechanism.This text divides into five chapters altogether: Chapter one In the introduction, have introduced the common sensor of displacement, has pointed out the fine characteristic of Hall's sensor, put forward the basic task; Chapter two Have introduced the basic operation principle of Hall's component; Chapter three Introduce Hall temperature performance, electromagnetic characteristic, zero error, frequency characteristic and these parameter commonly used compensation method and Hall simple application of component; Chapter four Having recommended the measurement principle of the feedback servo mechanism, systematic implementation method , the experimental result has appeared, structure the mathematics model, and has analysed the error; Chapter five Have pointed out the developing direction in the future while looking forward to .