TRICONEX-3101 The application of sensors in the automation industry
Definition of sensor
A sensor is a device that converts a physical or chemical quantity into an electrical signal that is easy to use. According to the International Electrotechnical Committee (IEC), “A sensor is a pre-component in a measurement system that converts input variables into signals that can be measured.” According to Gopel et al., “A sensor is a sensitive element that includes a carrier and a circuit connection,” while “a sensor system is a system that combines some kind of information processing (analog or digital) capability.” Weighing sensor is an integral part of the sensing system, which is the first gateway through which the measured signal is input.
TRICONEX-3101 The sensor converts one form of energy into another. There are two categories: active and passive. Active sensors convert one form of energy directly into another without the need for an external source of energy or excitation.
Passive sensors cannot directly convert the energy form, but they can control the energy or excitation energy input from another input, and the sensor undertakes the work of converting the specific characteristics of an object or process into quantities. Its “objects” can be solids, liquids, or gases, and their states can be static or dynamic (i.e. procedural). Object properties can be detected in many ways after being transformed and quantified. The properties of an object can be physical or chemical in nature. According to its working principle, it converts object characteristics or state parameters into measurable electrical quantities, and then separates the electrical signals and sends them to the sensor system for evaluation or marking.
TRICONEX-3101 The basic torque sensor is formed by attaching a special torsion measuring plate to a special elastic shaft and forming a variable bridge. The shaft is fixed on: (1) the secondary coil of the energy toroidal transformer, (2) the primary coil of the signal toroidal transformer, and (3) the printed circuit board on the shaft, which contains the rectifier and stable power supply, instrument amplifier circuit, V/F conversion circuit and signal output circuit. Fixed on the housing of the sensor:
(1) TRICONEX-3101 excitation circuit, (2) primary coil of energy toroidal transformer (input), (3) secondary coil of signal toroidal transformer (output), (4) signal processing circuit
Working process
±15V power supply is provided to the sensor, the crystal oscillator in the excitation circuit generates 400Hz square wave, the AC excitation power supply is generated through the TDA2030 power amplifier, and the energy toroidal transformer T1 is transferred from the stationary primary coil to the rotating secondary coil. The resulting AC power supply is passed through the rectification and filtering circuit on the shaft to the ±5V DC power supply. The power supply is used as the working power supply of operational amplifier AD822. The high precision voltage regulator power supply composed of the reference power supply AD589 and the dual operational amplifier AD822 generates a precision DC power supply of ±4.5V, which acts as both a bridge power supply and a working power supply for the amplifier and V/F converter.