Classroom on demand

Welcome to Classroom on demand, your source for educational materials related to the vertical transportation industry. This site represents the knowledge and expertise of the best engineers and mechanics in the elevator industry, and will help those new to the elevator industry learn about the basic workings of elevator systems, and also will serve as a reference for people with more experience.

Variable Voltage, Variable Frequency (VVVF)

A method of controlling an AC motor to vary the torque and speed by varying voltage amplitude and frequency.

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