High-Precision Constant-Speed-Rotation Control Using Nonlinear Compensation

High-Speed and High-Precision Position Control Using a Nonlinear Compensator

surge control in constant speed centrifugal compressors using nonlinear model predictive control

surge is one of the two destructive factors in compressors. surge is the stream instability phenomenon in compressor that imposes severe damages to the compressors. nowadays, suppressingsurge phenomenon is one of the most important issues in oil and gas industries, especially when flow reduction or gas reflux is considered. according to moore-greitzer compressor model, this paper designs an act...

High Precision, Wide Speed Range Rotation Sensing with UFDC-1

The application specific paper describes a high precision, wide speed rotation sensing approach based on the Universal Frequency-to-Digital Converter (UFDC-1). Such design approach lets significantly simplify the design process, reduce time-to-market and production price and produce tachometers and tachometric systems with high metrological performances and digital self-adaptive smart rotation ...

Nonlinear speed observer for high-performance induction motor control

In this paper, we consider tbe problem of estimah ing the angular velocity of an induction motor using encoder measurements. -0 methods are compared, In tbe first method, tbe speed is found by calculating the backward differes~ce of tbe position measurem ent and low-pass filtering the result. In the second method, the velocity is estimated using a nonlinear observer constructed using the known ...

Chopped nonlinear magneto-optic rotation: A technique for precision measurements

We have developed a technique for precise measurement of small magnetic fields using nonlinear magneto-optic rotation (NMOR). The technique relies on the resonant laser beam being chopped. During the on time, the atoms are optically pumped into an aligned ground state (Δm= 2 coherence). During the off time, they freely precess around the magnetic field at the Larmor frequency. If the on-off mod...