Introduction
Sensitive Device (VICTIM) is a general name of the interference object in the electrical system.
Type
Sensitive device can be a small electronic component, a circuit board assembly, or a separate power plant, or even a large system.
Features
When the sensitive device is used by the electromagnetic energy emitted by the electromagnetic hazel, it will be injured, and even electromagnetic hazards will occur, resulting in its performance degradation or failure.
Generally, sensitive devices such as devices, equipment, division systems, or systems are both electromagnetic harassment sources, and are sensitive devices.
Sensitive device example
1, the frequency converter (VARIABLE-FREQUENCY DRIVE, VFD) is the application of frequency conversion technology and microelectronic technology, and controls the AC motor by changing the motor operating power frequency. Power control equipment. The inverter is mainly composed of rectifier (AC variable DC), filtering, inverter (DC change), brake unit, drive unit, detecting unit micro treatment unit, and the like. The inverter adjusts the voltage and frequency of the output power supply by the interior of the internal IGBT. According to the actual needs of the motor, the power supply voltage thereof is supplied, which in turn achieves energy saving, speed up, and the other, there are still many protection functions. Such as overcurrent, overvoltage, overload protection, etc. As industrial automation is constantly increasing, the inverter has also been very widely used.
2, motor MOTOR is a device that converts electrical energy into mechanical energy it is a spool that generates a rotary magnetic field and acts on a rotor such as a murine-cage closed aluminum frame to form magnetoal power rotation. Most of the electric motor is divided into DC motor and the electric motor and the AC motor power system. Most of the electric motor can be a synchronous motor or asynchronous motor motor stator magnetic field speed and rotor rotation speed does not hold the synchronous speed motor mainly consisting of stator and rotor. The direction of the force movement in the magnetic field is in the direction of the current direction and the magnetic field direction of the magnetic field. The motor work principle is the action of the magnetic field to the current force to rotate the motor
3, the programmable logic controller, It uses a class of programmable memories for its internal storage programs, perform logical operations, sequential control, timing, counting and arithmetic operation, etc., and controls various types of machinery through digital or analog input / output. Or production process.
4, the contactor is divided into AC contactor (voltage AC) and DC contactor (voltage DC), which is applied to electric power, distribution and electricity. The contactor is generally meaningful to generate a magnetic field in industrial electricity to generate a magnetic field to close the contact to achieve the appliance of the load.
The AC contactor uses the main point to open and closing the circuit, and the control loop is turned on with auxiliary contact.