The basic knowledge of high-pressured transducer

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5 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. 5, V/f mode is V of the voltage when what meaning frequency drops also drops into scale, this problem already was answering 4 specifications. Maintain V/f to compare constant the most fundamental control pattern that control is frequency control of asynchronous electric machinery, it controls the voltage that transducer outputs while the power source frequency that dominates electric machinery changes, make of both it is than V/f constant, make the magnetic flux of electric machinery keeps constant thereby. In electric machinery rated moving circumstance falls, the voltage drop that the stator resistor of electric machinery and leakage resist is smaller, the carries voltage and electric machinery reaction electromotive force of electric machinery is approximate and equal. V/f comparing is constant the main problem that controls existence is low speed function poorer. Its reason is what voltage drop of resistor of stator of electric machinery of the asynchronous when low speed occupies scale to greaten, already cannot oversight, cannot think stator voltage and electromotive force of electric machinery reaction are approximate and equal again, still control magnetic flux of irretentive already electric machinery certainly by V/f comparing constant. Of electric machinery magnetic flux reduce the electromagnetism torsion that causes electric machinery necessarily; Additionally the dead band time of transducer power parts of an apparatus also is the main reason that affects performance of electric machinery low speed, dead band time causes voltage to drop to still can cause torsion at the same time pulsatile, the oscillation that can cause rotate speed, electric current is returned below certain condition. V/f comparing is constant control is commonly used go up at general transducer. This kind of transducer basically is used at the timing function of fan, water pump, and not tall to timing scope requirement circumstance. V/f comparing is constant pilot stresses a good point is the control of open loop speed that can have electric machinery. 6, when changing V and F in proportion, how does when metabolic frequency drops, the torsion of electric machinery reduce tension into scale ground completely, so as a result of communication impedance decrescent resistor is changeless, will cause the torsion that arises below low speed to have reduced liability. Accordingly, v/f is given when low frequency, should make output voltage to rise a few, so that obtain certain starting torsion, this kind of compensation says to increase start. Can use all sorts of method implementation, have the method that has automatically, choice V/f mode or adjust the method such as potentiometer. 7, alleged open loop is the sensor of speed of electric machinery furnish that what meaning uses to place, actual rotate speed feedback has pilot to control equipment, call " closed circuit " , need not speed sensor runs cry " open loop " , general transducer is open loop means more. 8, the overload of protective function output of high-pressured transducer oneself, output flows too, under-voltage of overvoltage of electrified wire netting, electrified wire netting, electrified wire netting breaks overheat of under-voltage of generatrix of overvoltage of generatrix of report, dc, dc, transformer, be short of power source of photograph, control to drop report, overheat of parts of an apparatus of drive breakdown, power. CNC Milling