APPLIANCES AND EQUIPMENT
Variable Voltage Variable Frequency (VVVF) Lift Drive
Variable Voltage Variable Frequency (VVVF) Lift Drive employs frequency inverter technology which regulates input voltage and frequency throughout the journey, drawing much less current during acceleration and deceleration.
Operating characteristics of different motor drives.
When compared with other modes of drives, one can see that the VVVF drive offers low starting current (approximately 1.8x of the rated current), high power factor (i.e. better efficiency in power supply) with good ride quality and floor leveling. It can reduce motor starting currents by as much as 50 to 80% compared with conventional motor drives. Further, wear and tear of the equipment can also be less during start/stop of the motor by using VVVF motor drive.
One example in Hong Kong using VVVF technology can be found at Po On Market and WSD Staff Quarters at Kwai Fong. It has been shown that this low noise level drive enables over 40% of energy saving with improved riding comfort.
A local example of VVVF drive in lift application.
