Close loop and Open Loop Vector control Methods

What is vector control (closed loop vector) control?   Current s controlled with respect to Torque and flux components in vector control of VFD. This is achieved by VFD based on the rotor position, rotor speed and motor parameters. RPM and torque are controlled rather than output frequency. Relationship between voltage and frequency is decided by operating conditions. In Close loop Vector control generally Encoder…

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How much speed of a motor we can increase beyond rated speed with the help of VFD / Ac drive

How much speed of a motor we can increase beyond rated speed with the help of VFD / Ac drive   In certain applications we need to increase the speed of a motor beyond its rated speed in such cases before increasing the output hz of VFD you should consider few things.   Load Load on the shaft of motor should be considered. If load…

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Using Multiple motors on Single VFD

Selecting VFD (Variable frequency drive) or ac drive Multi motor applications There are few many applications where multiple motors are connected to a single VFD (variable frequency drive) or ac drive. We would like to highlight few things before you chose a VFD for such kind of applications. Overload Protection Full load current of all the motors connected Output choke Disconnect connection for each motor.…

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Application Note for Ac Drives – Elevator

Elevator is basically a vertical transport system for human being and material. Mr. Otis after different inventions in other applications decided to invent an vertical transport machine for human. But the major concern in this was safety. So he develop such a mechanical brakes that even after hanging rope fails machine will not fall down. With this successful experiment he named it as elevators. Then…

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What is life of VFD / Ac drive

What Is Life of VFD? How much AC drive Last? What Is age of AC drives VFD?   There are many such questions peoples always keeps on asking.  Well some of the manufacturers gives working life of ac drives in there catalog ( Like 5 Years, 7 years or 10 years).Some Mentions Life of there components such as Life of dc Bus Capacitors, Life Cycle…

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Energy Saving Using VFD

Energy Saving Using VFD   Today, many companies in the world are looking ways and methods in achieving energy saving for their company operation. Saving Electrical energy is like a increase in profit margin. Ac drive is one of the solution for energy saving. We are feeling proud to share the technology of energy saving with VFD.   We hereby, Look onto a example report…

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Using a VFD / ac drive in EOT crane

EOT Cranes Application Overview Demag Cranes was one of the first companies in the world to produce the first steam-powered crane. With the time today these are known as EOT cranes EOT Cranes Means (Electric Overhead Travelling Crane).They are also known as bridge Cranes. Most of the industries use EOT cranes for Material Handling in the Plant. EOT cranes are rated in terms of Tonnage (e.g. 2T,…

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