Abstract
This paper aims at developing a filtered current gradient method for sensorless switched reluctance motor (SRM) drive under voltage PWM control. By implementing the zero-crossing point estimation algorithm of phase inductance slope, the proposed scheme can effectively avoid the interference signal caused by the advanced turn-on angle and ensure that only one position index pulse, representing the aligned position, is detected in each electric cycle. Meanwhile, a position index pulse delay strategy is developed to estimate the rotor position in real time with single-phase lacking fault-tolerant capability. The effectiveness of the proposed scheme is verified by the simulation on a 150W, three-phase 12/8-pole SRM.
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