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A novel planar motor based on the switched reluctance (SR) principle has been developed. This motor has the advantages of simple structure, low cost and ease of manufacture. The motor is highly reliable and can work in hostile working environments. However, in many industrial applications, the motor's performance is subject to practical constraints, such as mechanical noise, load disturbance and friction. The motor cannot cope with these difficulties under classical PID control scheme. Therefore an auto-disturbance rejection control (ADRC) strategy is proposed to overcome these problems. An ADRC velocity control strategy is implemented on the planar motor, and its performance is then compared with a classical PID controller. Experiment results demonstrate that the motor is more resistant to disturbances under this new control scheme. It confirms that ADRC is an effective solution to overcome the inherent control problems of the SR planar motor. It is expected that the same method can be applied to other SR machines with the same promising results. [ABSTRACT FROM AUTHOR]

A controller design methodology to regulate the output voltage of a phase-shifted resonant converter is presented. The design objective is to overcome the highly nonlinear characteristics of the phase-shifted resonant converter observed when the load is unknown. The control goal is to maintain the output voltage at desired values in the presence of large load perturbations by varying the phase angle of the full-bridge converter. The controller is derived using passivity theory which ensures that the closed-loop system is exponentially convergent and that only a single output feedback is required. An adaptive version is deduced to estimate the output load resistance for the passivity control. This feature allows the use of an extra output current sensor to be avoided. The structure of the controller derived using passivity theory is very simple. Laboratory experiments performed using a digital signal processor system confirm the robustness of the converter with the passivity-based controller. [ABSTRACT FROM AUTHOR]