Abstract
Conventional electric circuit theories make use of two different expressions of state variables. Phasor or vector expression is used for steady state analysis and real value expression is used for transient state analysis. Due to the different expressions steady state and transient state solutions are not compatible and it causes inconvenience and awkwardness in analysis and computer simulation. The spiral vector method proposed in this paper, which makes use of exponential time function for expressing state variables, can treat electric circuit analysis in an unified way and opens up a new area of the unified circuit theory. The spiral vector method is a very powerful tool for analysis and control of AC machines also.1)-4)
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