In this topic , the error characteristic of resistance voltage sensor was analyzed in theory , by using electric circuit analysis , the reasons which affected its error were gotten . based on theory analyses , initial structure was designed . then by using fem ( finite element method ) of simple resonance field , several structures electromagnetic field was calculated , and their amplitude errors , phase errors , maximum of electric field intensity and frequency characteristic of amplitude error were contrasted
2.
Constant stator magnetic linkage control frequency converter includes power devices utilizing igbt , drive circuit using three - phase drive ic with multiple protection functions . pwm signal formation circuit in the way of voltage space vector control and realized with pld ( programmable logic device ) devices and compensation for the influence of supply voltage variation and stator resistance voltage drop
3.
First , passive resistance network was selected as direct current biasing network , which offered direct voltage for base through the resistance voltage divider composed of two resistances , among them the upper resistance connected from the dc to base , the lower resistance connected from the base to ground . the collector connected with dc directly
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