Wobble generator for standard converters
For drives with periodic traversing motion, for technological reasons, the drive inverter frequency should periodically change around the selected frequency setpoint. To implement this, a periodically changing supplementary setpoint (the wobble signal) is superimposed on the frequency setpoint.
The wobble generator function has not been implemented in standard drive inverters. However, there are various ways of generating a "wobble generator".
The following example is described using the free blocks of a MICROMASTER 440.
The example describes the emulation of the wobble function using...
- the free blocks – index term OSCILLATOR,
- the PID controller,
- the S7 control.
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(STEP 7 V5.x)
Reference to SINAMICS CU240x with firmware < V4.0 removed.