Thermistor temperature sensor ferrite

Thermistor temperature sensor ferrite(1) Structure thermistor temperature sensor from the shell ferrite, ferrite, the reed switch and a permanent magnet, and the like. Magnetic reed switch in the circuit configuration of two annular permanent magnets and ferrite. The use of ferrite magnetic properties with drastic temperature changes, so that the reed switch is turned on or off. SuchCrank Position Sensor are generally used to control the electric car radiator fan and hydraulic lights.(2) WorkThermal ferrite is a ferromagnetic material, when more than a certain temperature, the permeability of the ferrite sharply, which has a ferromagnetic body from the paramagnetic (weakly magnetic) rapidly changing nature of such abrupt changes in temperature called the Curie temperature. Curie features you can make use of the reed switch is turned on or off.Need to use different sintering material composition and heat treatment methods available in different Curie temperatures. For example, to control the engine cooling water temperature is maintained at 65 to 100%: between two ferrite when the Curie temperatures of 100 ℃, 65 ℃, the corresponding temperature range of the magnetic field strength becomes the form shown in Figure 2-6 shows the flux ring.When the ambient temperature is lower than the thermal ferrite 65 ℃, the two ferrite ferromagnetic material magnetized by the permanent magnet, and with the formation of a magnet and reed switch the contacts of the magnetic field lines through a through and produce suction, so that contact is closed, as shown in Figure 2-6a. When the ambient temperature is higher than the thermal ferrite 100 ℃, two ferrite permeability sharply, into a normally magnetic material is not substantially sensitive magnetized ferrite, ferrite exists no equivalent . Magnetic field of the permanent magnet, the reed switch contacts and generate a magnetic field lines through the suction, the contact is closed, as shown in Figure 2-6c. When the ambient temperature sensitive ferrite 65 ~ 100 ℃ in between, wherein a Curie temperature of 65 ℃ ferrite magnetic material into a normally is not magnetized, and 100 ℃ becomes ferromagnetic ferrite body which is magnetized and the permanent magnet is formed with the left one magnet. Then
Reed switch lines through the contacts and generates a magnetic repulsive force, the contact opens