NON-CONTACT FLUXGATE POSITION SENSOR FOR MONITORING THE STATE OF THE VALVE
Abstract
The aim of the study is to develop a non-contact fluxgate position sensor to control the open
/ closed state of the valve. There are many examples of the use in modern technology of elements
or devices that interact with a magnetic field. One of the most urgent tasks is to use the influence
of the magnetic field as a means of control or as a component of the control environment. The use
of magneto-optical sensors for monitoring the functioning of technical objects is due to their noncontact
measurement method, the ability to measure not only magnetic, but also various other
physical quantities, the relative simplicity, reliability and low cost of the design of the sensitive
element, flexibility in use, operation in low-temperature and high-temperature environments.
One of the sensors of this type is a fluxgate magnetic field converter. Valves of various
pneumohydraulic systems are an example of the object of introduction of a fluxgate sensor.
The essence of the task is to create a non-contact limit switch of the valve spool, signaling the
closed or open state of the valve and transmitting this information to the control system. It is proposed
to divide this task into stages and their sequential implementation. First, a search and analysis
of existing solutions that implement the position sensor using the fluxgate control method is
carried out to improve the design being developed. Next, the initial design of the sensitive element
of the fluxgate transducer is developed, according to the initial design, a geometric 3D model of
the sensitive element is created, and the proposed material of the constituent elements of the sensor
is selected. With the help of numerical methods of computer simulation, the operation of the
sensor is simulated and its output characteristic is determined under various operating modes.
According to the design characteristics, the optimal design and configuration of the sensor's sensing
element is selected and calculated. As a result of the simulation, assembly and working drawings
of the sensor are developed. The proposed method for solving the problem is characterized by
the complexity of studying nonlinear magnetic systems and their modeling. The results of this study
can be recommended for the development of magneto-optical sensors of this or another type and
for the study of materials with nonlinear magnetic properties.
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