Inductive sensors used in the working principle of the balance

Inductive sensors are mainly used in electronic precision scales, an important feature of the precision balance is to measure the quality of the measured object without measuring the weight of the weight, but the use of electromagnetic force and the measured object to balance the principle of gravity to measure . The weighing pan is connected with the coil through the bracket connecting rod. When the weight of the measured weight mg acts on the coil through the connecting rod bracket in the weighing range, the direction will be upward. At this moment, if the current passes in the magnetic field, the coil will produce a Electromagnetic force F, can be expressed as follows: F = KBLI

Where K is constant (related to the unit of use), B is the magnetic flux density, L is the length of the coil wire, and I is the current through the coil wire. Electromagnetic force F and gravimeter objects on the scale of gravity mg equal to the opposite direction to achieve balance, at the same time in the role of the elastic reed pan support back to its original position. That is, F = KBLI = mg

From the above equation we can see that in the magnetic field of the coil, the current flowing through its internal I is proportional to the mass of the measured object, as long as the measured current I can know the mass of the object m.

Any balance control system in order to further improve its accuracy, the need to add closed-loop control system, if it is said to be worse, the balance is unbalanced, detected by the photoelectric detector coil in the magnet in the transient displacement, the preamplifier And PID regulator to produce a variable output, and then compared to a fixed sawtooth, to adjust the widening pulse width, pulse width modulation and then use to control the current switch, so that the current decreases, while the constant current source is fixed, So that the current flowing through the coil increases, so that the electromagnetic force increases and offset the measured object to reach a new equilibrium.

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