ABSTRACT
Elevator is a common drag equipment in production and life. The application of
AC motor is more and more widely used. The asynchronous motor speed control
system with digital frequency converter is an important drag control system in the
current industrial production.
In recent years, the research of AC motor VVVF and its related technology has
become an important topic in the field of modern electric drive. With the introduction
of new power electronic devices and microprocessors and the development of the
theory of AC motor control, the technology of AC variable frequency speed regulation
will also make great progress.
In this paper, the theory of variable frequency speed regulation, inverter
technology and SPWM production principle are studied. On this basis, a new type of
digital three-phase SPWM variable frequency speed regulation system is designed.
Through the principle of circuit, power electronic technology, MCU and its interface
technology, automatic control principle, electric machine and drag foundation, electric
drag automatic control. The application of knowledge of system, automatic detection
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