Won-Sang Im

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There is the possibility of an open-switch fault in a three-phase ac-dc pulsewidth-modulation (PWM) converter due to problems with the switching devices. In this case, the converter causes unbalanced input ac currents including increased harmonics and dc-link voltage ripples. In this paper, the one-open-switch fault case of six switching elements is(More)
This paper proposes a detection and compensation algorithm of two non-ideal output signals of a resolver to reduce position error. Practically, a resolver generates position errors because of the amplitude imbalance and imperfect quadrature between the two output signals of the resolver. In this paper, a digital signal processor (DSP) based(More)
The wheelchair motion has propulsion and rotation components and the x-y axis signals of the joystick also can be expressed as the control command of these components. Using this phenomenon, the torque distribution method of two driving wheels and the model following control algorithm based on the propulsion and the rotation model of the electric wheelchair(More)
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