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                Transducer uses medium problem and the way to deal with a situation

                来源: 作者:Stand originally 时间:2008-12-25 Tag: 点击:
                One, harmonic problem and its countermeasure
                The main circuit of transducer is mixed by rectification, inversion commonly 3 parts comprise filter wave, the input is rectification circuit partly, output is inversion circuit partly, they are what involve action by step aside is nonlinear component comprises. In the process that opens circuit, want to produce harmonic. Inferior second harmonic is affected to electromotor load normally bigger, cause torsion pulsatile; And the leakage current that taller harmonic makes transducer outputs cable increases, make electromotor exerts oneself insufficient. The effect that the transducer with lesser capacity produces Gao Cixie wave is lesser, but the capacity when transducer bigger or amount relatively a long time, the interference of causes by electric current of Gao Cixie wave Gao Cixie wave of generation must is like in order to handle, will generate interference to other equipment and detecting element otherwise, serious when the likelihood makes these equipment misoperation. According to statistic, when Gao Cixie wave exceeds 5% , the computer can make mistake; When exceeding 10% , electronic switch can produce misoperation. Because the harmonic of this transducer output must be restrained,be inside the range that permit. Basic method has two.
                1. Cut off the transmission way of interference
                (1) is cut off common the track that ground wire transmission jams. The ground connection of the ground connection of dynamical line and control line is apart, be about to the earthing terminal of dynamical plant receives ground wire to go up, receive the earthing terminal of control equipment this unit dish on metallic crust.
                (The meeting when 2) line stands by the lead that has interference source electricity is disturbed. Wiring depart disturbs effective to eliminating this to plant, often walk along high-pressured cable, power cable, control cable apart with appearance cable, computer cable namely line.
                2. Those who restrain interference source to go up is tall second harmonic
                (1) increases the impedance inside transducer power supply source. Normally the internal resistance of power source equipment fights what can have electric capacity of wave of filter of amortize transducer dc not to have the action of result power, impedance is jumped over inside big, harmonic content is smaller, this kind of internal resistance fights the short circuit impedance that is transformer.
                (2) installs filter. Filter of passive of outfit LC circuit is added before transducer, filter is dropped tall second harmonic, normally filter is dropped 5 times with 7 harmonic.
                (3) installs reactor. Before transducer side installs circuit reactor, can restrain overvoltage of power source side. Be more than 50m or 80m when length of electric machinery cable (blame screen) when, reactor is installed between transducer and electric machinery.
                (4) uses transformer heterogeneous to move. General transducer is 6 pulse commutator, the harmonic that arises accordingly is bigger. If use transformer heterogeneous to move, make phase angle each other differs 30 ° , the △ that be like Y- , △ - the effect that the transformer that △ combines constitutes 12 pulse, can reduce low second harmonic electric current, very good inhibition harmonic.
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