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This paper describes a new and straightforward approach to estimate the air-gap flux position in induction machines. The proposed scheme is based on the injection of a high-frequency oscillating stator voltage instead of a three-phase high-frequency voltage, thus allowing a reduction in audible noises and torque ripple. The main feature of the proposed approach is that a simple air-gap flux tracking algorithm is developed using the amplitude variation of the high-frequency component of the zero-sequence voltage. Moreover, the zero-sequence voltage is sensed at the output of the inverter rather than at motor terminals. The estimated position is not influenced by load and parameter variation and can be performed at any frequency, including low and zero frequency. An experimental prototype has been implemented showing the performance of the proposed approach. [ABSTRACT FROM AUTHOR]

This paper describes a low-power Switched Reluctance motor drive for home appliances featuring close to unity power factor and low cost. The proposed drive includes a compact Power Factor Controller input stage based on a quasiresonant boost topology. The converter structure is suitable for integration and allows one to develop an inexpensive chip implementing all the main functions required by such a drive. Experimental results on a prototype are presented to evaluate the efficiency of the proposed drive. [ABSTRACT FROM AUTHOR]