The dc grounding method 2

Multipoint earthing: ground wire of each system USES more short wire grounding method, called the multipoint earthing. When a signal or a high frequency of electromagnetic interference or using fast logic, coupling capacitance coupling effect will produce some kind of interference, then lead length become the main contradiction, multipoint earthing must be used to minimize the series impedance, and to minimize the standing wave. Multipoint grounding method is applied to the high frequency circuit (f > 10 MHZ). Before two hundred and thirty, interference is called radio frequency interference, because most of the noise and interference signal from the radio frequency. Today the electronic computer, digital technology and logic circuit constantly expand the application field, the interference is known as the electromagnetic interference (emi) now. Electromagnetic interference including conductive electromagnetic interference, the interference energy sent through a wire or cable from one circuit to another circuit. Reduce the conductive electromagnetic interference is through reasonable design of the circuit, filter acmotor2.blogspot.com and rational grounding circuit is used to realize; 

The radiation electromagnetic interference of the energy is transmitted through the electromagnetic field in air. In the design of casing and casing, by choosing reasonable shielding materials, single phase asynchronous motor construction technology and equipment arrangement and the reasonable grounding technology and so on to reduce the radiation electromagnetic interference. Which deal with grounding engineering is the most important technical measures preventing electromagnetic interference. Most of low frequency interference is coupled to each other through the line, the previously mentioned common impedance coupling. When two circuit electric current flows through the same public impedance of a circuit when the current is 5kw permanent magnet generator formed on the impedance voltage will affect the www.dongfeng-motor.com other circuit, which is common impedance coupling. If a common grounding network in different places respectively connected to the attachment. Due to the common impedance coupling relationship, the attachment will be Vg1 and Vgz voltage between the connection of the ground voltage is not the same. Vg1 and Vgz is interfering voltage, after amplification could directly affect the communication or control signals. Multipoint grounding allow there is a lot of the advantages of the loop, then at the same time, use of low frequency circuit can be harmful, if you have the above situation, can consider to adopt the method of mixed ground.