The frequency control of fan water pump is energy-saving analytic author: Cai morning far unit: Energy-saving fall bad news, increasing benefit is the direction that whole society should try hard for it. The electromotor of our country occupies the 70 ％ of 60 ％ ～ of countrywide electricenergy production with n, equipment of fan, water pump year the 1/3 that power consumption occupies countrywide electric power to use up. The traditional method that uses at the equipment such as fan, water pump is the fender that be exported through adjusting or enters the mouth, valve degree will control wind force and water supply amount, its output power to be used up in great quantities the process flows in cut of ground of fender, valve in. Additional, because be in normally in the design to satisfy peak value requirement, the abundant quantity of water pump type selecting often passes big, also created not due waste. According to fan, water pump kind torsion is characteristic, use frequency control implement will move section discharge, wind force, greatly managing electric energy. Analyse below in fan water pump kind the effect that transducer uses to be able to be achieved in load. One, when achieve through frequency control energy-saving. It is with water pump below for the exemple bright, by the graph 1 can see: Discharge Q direct ratio is at N3 at direct ratio of N2 power P at direct ratio of N2 torsion T at direct ratio of H of pressure of rotate speed N in ordinary water pump flow control use valve will adjust, if the graph shows 2 times: The relation of conduit obstruction H and discharge Q is H direct ratio at RQ2, among them when R is obstruction coefficient electric machinery to move in constant speed, discharge falls for 100% circumstances (working place is A) , power of water pump axis is equivalent to the area that Q1AH1O place includes. Electric machinery moves in constant speed when, the measure that adopts adjustable valve obtains the discharge of 70% (working place is B) , will bring about tubal block to increase, power of water pump axis is equivalent to the area that Q2BH2O place includes, so axial power drops not quite. When using frequency control to control flow, because conduit character does not have a change, water pump character produces change (working place is C) , axial power and the area that Q2CH3O includes become direct ratio. Its section energy and the area that CBH2H3 includes become friend direct ratio, power input is reduced greatly. If the graph shows 3 times: Mention before no less than, the cube of axial power P and rotate speed N becomes direct ratio. Use transducer to undertake timing, drop when discharge 80% when, rotate speed also drops 80% , and axial power N will drop 51 of rated power. 2% , if discharge drops 60% , axial power N can drop 21 of rated power.
6% , the efficiency influence of the loss of efficiency that still needs to because rotate speed is reduced,consider to be able to be caused of course and additional control equipment.
Although such, this energy-saving number also is very considerable, because this is in the machinery of fan water pump, use rotate speed to control means to adjust wind force or discharge, be in energy-saving going up is an effective method. 2, 2 when frequency control place comes true energy-saving frequency control adjusts output voltage automatically according to laden circumstance, pass the optimal excitation to electric machinery, reduced effectively without work loss, raise systematic power factor, reduce noise of electric machinery job, prolong electric machinery service life. The total electric current of electromotor (IS) is electric current of electric machinery excitation (IM) and electric current of electric machinery moment of force (the vector of IT) and, the electric current of excitation of electric machinery of of power factor; that the cosine value of IS and IM included angle is electromotor namely decides the voltage that goes up at be being added in electric machinery coil, below labour frequency condition, alternating voltage is 380V constant and changeless, because this excitation electric current also won't change; to be below frequency conversion condition, transducer detects automatically laden moment of force, according to real load the decision outputs voltage, because this reduces output tension automatically when load is inferior, in order to maintain highest power factor.
Because transducer reduced electric current of electric machinery excitation automatically, make the total electricity that exports total electric current to work under labour frequency apparently, managing this function is in the loss in circuit and the of loss; that do not have result power Denver this AEO function is called in VLT series transducer (Automatic Energy Optimization, ) of automatic and energy-saving function.
Writer unit: Shanghai ferry believes address of transducer limited company: District of Shanghai new city 248 lane 5 3 buildings 200083 Email: Office@sinodrive.
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