| In this paper, the development and apply about variable-frequency regulating speed technology of induction motor and single-chip microprocessor technology is reviewed. The principle of two-phase induction motor is described. The vector control mathematical model of two-phase induction motor is infered in theory. The vector and coordinate transform theory of two-phase induction motor are built. A single-chip microprocessor controlled voltage-controlled inverter-fed vector control variable frequency variable speed system of two-phase induction motor is presented by applying both vector transform theory and sinusoidal pulse width modulation theory and single-chip microprocessor technology. In addition, a reasonable vector controlled system structure block diagram and corresponding program block diagram are put forward by both software and hardware. According to the characteristics of the repertoire of MCS-51, the complicated vector operation is simplified in the program structure and the all-digitization is achieved in the vector control system. In the end, the conclusive analyse of vector control variable-frequency system is presented.
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