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Reliability of electric drives is of paramount importance for safety critical applications in transportation, medical and military industries. While numerous fault tolerant machine and inverter topologies have been developed for improving drive reliability, comprehensive reliability evaluation of fault tolerant electric drive systems has not been reported in literature. This paper performs quantitative...
Dual inverter open winding drive (DIOWD) has several advantages over standard 3 phase drive such as multilevel voltage output, lower dc link voltage, high efficiency and better fault tolerant capability. In this paper three DIOWD topologies aiming for high speed and/or safety critical applications are evaluated. Their operation characteristics, VA ratings, efficiencies, harmonic distortion factors...
The presence of saliency/anisotropy in a Permanent Magnet Synchronous Machine (PMSM) is essential to track the rotor position when using high frequency signal injection based sensorless control. At high frequency d-q incremental inductances become dominant over the d-q normal (chord) inductances. In addition when load is applied to the machine cross-coupling inductance arise since the saliency/anisotropy...
The implementation of the phase locked loop (PLL) structured observer in high frequency signal injection schemes requires tuning of the PI controller to lock on the rotor position. The PI controller is tuned depending on the signal to noise ratio (SNR) which is related to the amount of saliency/anisotropy presented in the machine, the amplitude and phase of the incoming modulated carrier signal. Thus,...
Intermittent chaotic phenomena can appear in a dc-dc step down converter when the later is coupled with spurious high frequency signals. It is therefore important to understand why and how these phenomena occur and what is their relationship with the frequency characterises of the spurious injected signals. This paper uses a fast wavelet transform to isolate the frequency of these signals even when...
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