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                Knowledge of frequency conversion technology

                来源: 作者:Stand originally 时间:2008-12-25 Tag: 点击:
                1, what is transducer?

                Transducer is the knows action to will be versed in commutation of frequency power source is another frequency electric energy control equipment that uses electric power semiconductor device.

                2, what is the differentia of PWM and PAM?

                PWM is modulation of width of English PulseWidthModulation(pulse) abbreviate, change the pulse width that pulse lists by definite pattern, in order to adjust sendout and means of undee a kind of tone pitch. PAM is modulation of extent of English PulseAmplitudeModulation(pulse) abbreviate, it is the pulse range that changes pulse line by definite pattern, the way of a kind of modulation that exports value of a quantity and weaveform in order to adjust.

                3, what do electric profiling and electric flow pattern have to differ?

                The main circuit substantially of transducer can divide it is two kinds: Miao of  of wall of Miao cut fade is good blow be troubled by stretch tight Yang Xi shakes  melt Jian seeks  of Gan Deng sole to stretch tight dice Mi returns Qian of elaborate of chasm of solemn twinkling ㄊ Bian of Si of  of wall of 5 Si fade having enough is blown be troubled by stretch tight Yang Xi shakes  melt Jian seeks Gan Deng sole

                4, why the voltage of transducer and voltaic proportionate change?

                Electric current has flowed inside the magnetic flux that the torsion of asynchronous electromotor is electric machinery and rotor between interaction and of generation, below rated frequency, if tension is constant and reduce frequency only, so magnetic flux is too big, magnetism loop is saturated, serious when burn down electric machinery. Accordingly, frequency and voltage want to be changed into scale ground, change namely while frequency conversion is led, control transducer outputs voltage, make the magnetic flux of electromotor keeps certain, avoid the generation of weak magnetism and magnetism saturation phenomenon. Means of this kind of control is multi-purpose at fan, pump kind wait energy-saving model transducer.

                5, when electromotor uses drive of labour frequency power source, voltage drops an electric current increase; To transducer drive, if frequency drops when voltage also drops, so whether does electric current increase?

                Frequency drops (low speed) when, if output same power, criterion electric current increases, but in torsion certain condition falls, electric current is almost constant.

                6, when using transducer to run, the starting electric current of electric machinery, starting torsion how?

                Use transducer movement, heighten frequency and tension accordingly as the acceleration of electric machinery, starting electric current is by limitation under 150% rated electric current (basis machine kind different, for 125%~200%) . When power source of the frequency that use worker worker starts directly, starting electric current is 6~7 times, accordingly, will produce machine electric the concussion that go up. Use transducer drive to start smoothly (starting time lengthens) . The 1.2~1.5 that starting electric current is rated electric current times, starting torsion is 70%~120% rated torsion; Enhance functional transducer automatically to containing torsion, starting torsion is 100% above, can take full load to start.

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