Other names for this are frequency converter, ac drive converter, etc. The term refers specifically to electronic drives controlling the speed of ac motors by adjusting the frequency and voltage delivered to the motor. A variable frequency drive vfd is a type of motor controller that drives an electric motor by varying the frequency and voltage supplied to the electric motor. A better understanding of vfds will lead to improved application and selection of both equipment and hvac systems. The acs 6000 medium voltage drive for speed and torque con trol of 3 36 mw induction or synchronous motors is a member of the abb ac drives product family. Usually 1024 to 4096 incremental encoders symbols are used as a motor speed feedback and in. Product brochure medium voltage ac drive acs 6000, 3 36. Variable frequency drives vfd s popular speed control devices used in industrial, commercial and residential applications. Ac drive control speed of ac motor by varying output voltage and frequency through sophisticated microprocessor controlled electronics device. What is the difference between vfd and vvvf drive used for controlling the speed of induction motors. Huge energy savings potential operating centrifugal fans, pumps and compressors vary frequency of electrical supply to an induction motor to vary the motor speed. Vvvf is listed in the worlds largest and most authoritative dictionary database of abbreviations and acronyms vvvf what does vvvf stand for. Other names for a vfd are variable speed drive,adjustable speed drive, adjustable frequency drive, ac drive,microdrive, and inverter.
Variable frequency drive vfd usage has increased dramatically in hvac applications. What is the difference between vfd and vvvf drive used for. Vvvf control variable voltage and variable feriquency. How a vfd or variable frequency drive works technical. The vfds are now commonly applied to air handlers, pumps, chillers and tower fans. Describes the functioning of vfd or variable frequency drive. Use pdf download to do whatever you like with pdf files on the web and regain control. Variable frequency drive vfd basic configuration the basic configuration of a variable frequency drive is as follows. Nowadays vvvf drive used extensively for speed control serves this purpose alsoread full topic and get free pdf file. Star delta connection diagram and working principle. Ac induction motors design and control how it works. While studying about different speed drives, i came across these two terms. Variable frequency drive operating principle whilst there are a number of variations in variable frequency drive design. This paper provides a general overview of the use and application of variable speed drives in lift systems, discussing both current systems and recent advances in this area.
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