Controllers and power electronics
Masatsugu Takemoto
In this chapter, a digital controller and a sample program for controlling a bearingless motor are introduced. This is a general-purpose structure that can be modified and tailored to a specific bearingless drive application.
19.1 Structure of digital controllers
Currently, digital control using digital signal processors (DSP) is usually used in a bearingless drive to realize the system. This is because:
1. The drive inverters generate a lot of electromagnetic noise due to switching. However, the interference caused by this noise in the control loop of the magnetic suspension can be reduced by using digital control. In particular, digital control can protect the delicate derivative ...
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