High-precision positioning and synchronization
To optimize performance, many applications across all industry sectors have a need for precise positioning and synchronization. These applications include:
- rotary tables
- packaging machines
- labelling machines
Traditionally, positioning and synchronization operations have been performed using servo drives. However, many applications do not require the high dynamic performance offered by a servo drive.
Therefore, Danfoss Drives has developed an innovative alternative to servo control. The Integrated Motion Controller (IMC) is functionality that enables an AC drive to perform high-precision positioning and synchronization operations without the need for additional modules or hardware. IMC is now configurable in the software of the VLT® AutomationDrive FC 302.
Advantages of integrated IMC
IMC has many advantages. It works with all conventional motor technologies, with closed loop or open loop control, and offers sensorless homing with torque detection. Drives are adapted to the applications through simple parameterization. This means that knowledge of servo technology or programming languages is not required. As no encoder or additional cables are needed, engineering, installation and commissioning time and costs can be reduced.
IMC offers three types of positioning
The IMC function can be used universally, since it can position absolutely, relatively and with sensor. In absolute position, the position reference refer to a defined machine zero point. This is determined at the start of the machine by the so-called homing run. If an optional feedback system with absolute position is used, this is not necessary because the zero point is set by the encoder. A typical application for this in Leobendorf is “downstream” of the cone oven with an absolute positioning of linear axes. The task here is to place paper in front of the continuously moving candy cones in order to be able to slide them into each other in the next step. The motors used are PM motors that are operated in open loop. The advantage of IMC: The rotary encoder can be eliminated, thus eliminating the costs for the encoder as well as for cabling, evaluation and work time for installation and commissioning. The use of the VLT® AutomationDrive (with IMC) itself also brings savings, because the purchase and installation costs of standard drives are significantly lower compared to a corresponding servo system.