| The switched reluctance driver (SRD) is a novel methanol-electronic device with the virtue of simple structure and high efficient. The rotor position information in SRD is essential in detaining the switching instants for proper control of speed, torque and further optimizing the motor operation performance. So rotor-position estimation is a necessary factor of a SRD to run properly. As the drawbacks of the traditional direct rotor-position detecting schemes, which are liable to be influenced by the environment factors, the indirect rotor-position estimation techniques, applying some of SRD's electronic parameters to work out rotor position information, are so that created and developed rapidly.The paper first gives a comprehensive review of the available indirect rotor-position estimation techniques for SRD. On the basis of the review, the basic idea of amplitude modulation (AM) encoder technique is described and analyzed in details. Then two indirect rotor-position estimation schemes based AM technique are discussed.The fundamental idea behind one scheme is to realize AM technique in one of the non-conducting phases. A computer model based MATLAB has been developed to analyze this scheme. Both sensing-coils technique and AM technique are got applying in another scheme. In this scheme, sensing-coils are connected in opposite order, which are different from the main-coils, avoiding interference from main-coils. Meanwhile, a new way to obtain discrete rotor-position signals is proposed, which utilizes the geometrical characteristic of inductance curves of SRD. This scheme has been implemented on a 6/4, 6kW drive system and the experimental results are verified.
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