Variable frequency drives and encoder systems

Abstract

Variable frequency drives (VFDs) and rotary encoders have become indispensable in modern conveyor technology.

They are both complex electronic components, however, so that certain rules need to be adhered to.

Variable frequency drives can be differentiated into V/f controlled and sensorless control variable frequency drives.

Encoder systems are sensors mounted on the rotor shaft which can record information about the instantaneous rotor position and speed.

If a motor is used together with a rotary encoder and variable frequency drive in a closed control loop, it is usually referred to as a servo system or the VFD is then referred to as a servo controller.

The differences between the various types of variable frequency drives and encoders are explained in the following chapter.