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How to make use of AC motor capacitor to adjust the speed?

by:SMiLer     2021-03-11
How to make use of AC motor capacitor to control the speed? Can be seen from the figure, this is a use of capacitance for single-phase ac motor speed control circuit diagram. Do you know the capacitive reactance? ZC=1/2π fC ( The first C should be a smaller size, technical reasons to play out) Is capacitive reactance is inversely proportional to the frequency, is inversely proportional to the capacity. Capacitive reactance is a voltage drop. Volume is smaller, the greater the capacitive reactance, the greater the voltage drop on capacitance, and the less the voltage on the motor, and voltage on the motor small natural speed is low! In ontology, high wind through capacitance step-down, so the speed is high, volume is the largest. What exquisite electrical unit conversion? Current units: ampere ( 一) , ma ( mA) , microamps ( μ 一) ; The conversion relation of some concrete is: 1 a = 1 ma ma = 1000 & 1000 mu; 一个。 Units: v ( V) , kv ( kV) , millivolt ( mV) , microvolt ( μ V) 。 The conversion relation of some concrete is: 1 kv = 1000 = 1000 v 1 v 1 mv = 1000 mv & mu; V。 (in re units: Ω ) ; The commonly used units are: megohm ( MΩ ) , thousands of Europe ( KΩ ) 。 The conversion relation of some concrete is: 1 MΩ =1000 KΩ 1 KΩ = 1000Ω 。 Capacitor units: ferrari, referred to as 'method, expressed with F, micro method ( μ F or & mu; ) ,,, Nf or n) , leather method ( Pf or p) The conversion relation of some concrete is: 1 f = 1000000 & mu; F 1μ F = 1000 nf 1 nf = 1000 pf
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