Abstract：Strap-Automatic vertical drilling system is a kind of integrated drilling device centralizing the mechanical electrical, and hydraulic areas that can effectively solve the technical problem of deviation control and fast drilling. Permanent magnet synchronous motor (PMSM) control system is its significant part to achieve the electronically controlled hydraulic-driven rotary steering feature. To suppress the inverter loss and narrow pulse-width which often occur when the supply voltage of PMSM control system changes in wide range with high-temperature environment of the underground, a maximum pulse width space vector modulation (MPW-SVM) method of switching frequency adjusting on-line is proposed in this paper. Six 60 degree sectors are subdivided into twelve small 30 degree sectors to realize the optimal distribution of zero vectors for effectively suppress the switching loss and narrow pulse-width when the power supply operates at the maximum range. Meanwhile, several fuzzy logic rules are applied varying from the modulations to fulfill the function of on-line adjusting of switching frequency, and furthermore to suppress the current ripple during the normal voltage. The proposed method is verified by the experimental results.
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2013, Vol. 28 
