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Today's elevators are increasingly demanding speed, safety, comfort and intelligence, while old-fashioned elevators are struggling to meet today's demands. An elevator drive control scheme based on 51 series chips is designed. The VVVF (variable Voltage Frequency Control) technology is selected as the transmission control mode of the system. The single-chip microcomputer control technology and the SPWM (sinusoidal pulse width modulation) technology are adopted to change the frequency and voltage of the traction motor power supply. The purpose of accurately controlling elevator speed is realized. It has some practicability in the field of retrofit of old elevator and design of new elevator system.

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