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A novel sensorless control drive for an interior permanent magnet motor

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5 Author(s)
S. Saha ; Matsushita Electr. Ind. Co. Ltd., Osaka ; T. Tazawa ; K. Narazaki ; H. Murakami
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In this paper, development of a novel PWM drive system for an interior permanent magnet (IPM) motor without using any current and position sensors is reported. The uniqueness of the drive system lies in defining a wide angle energisation period (more than 120° but less than 180°) and modulating the voltage waveform appropriately such that the zero-cross of the induced back EMF is always detected during the current zero-cross period. Hence, the sensorless control strategy of the wide angle drive is made identical with the traditional 120° drive where, the turning ON of a new phase every time calls for the perfect back EMF zero-cross detection and an appropriate delay. Valid experimental results are presented for a 150° PWM drive. At the end, feasibility of a 165° drive is also discussed

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Industrial Electronics Society, 2001. IECON '01. The 27th Annual Conference of the IEEE  (Volume:3 )

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