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Abstract
This paper proposes a new simple vector control method for sensorless drive of permanent-magnet synchronous motors (PMSMs). The proposed method takes an approach to estimate directly phase of the quasi-optimal stator current through control of the power factor phase instead of estimation of rotor phase. It is established based on new analysis of motor characteristics and has the following attractive features: 1) it can be applied to both of salient and non-salient pole PMSMs; 2) stator current control quasi-minimizing copper and/or iron loss is directly performed; 3) it is insensitive to motor parameter variation, and does not requires motor parameters with precision; 4) it is simple. Simple and practical rules for selecting design parameters of the method are clearly given based on the analysis. Effectiveness of the analysis and usefulness of the proposed method are verified through experiments.
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