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Based on the Lyapunov's direct method, a new learning control design is proposed. The proposed technique can be applied in two ways: it is either the standard backward recursive design or its extension. In the "rst case, the design yields a class of learning control with a di!erence learning law, under which the class of nonlinear systems is guaranteed to(More)
In this paper, a systematic procedure to design the robust ∞ H fuzzy controller for a nonlinear active magnetic bearing (AMB) system affected by time-varying parametric uncertainties is presented. First, the continuous-time Takagi-Sugeno (T-S) fuzzy model is employed to represent the nonlinear AMB system. Next, based on the obtained fuzzy model, sufficient(More)
This paper presents the design and implementation of a DSPbased controller for a super high-speed (>80,000 rpm) permanent magnet synchronous motor (PMSM). The PMSM is a key component of the centrifugal compressor drive of a reverse Brayton cryocooler that is currently under development for NASA and Florida Solar Energy Center. The design of the PMSM(More)
Flywheel energy storage (FES) devices have been a popular method of energy storage because of their low maintenance requirements and ability to charge and release substantial amounts of energy in a short period of time. The amount of energy stored in an FES device mainly depends on the angular velocity of the rotor. The objective of the rotor design is to(More)
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