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New sensorless vector control using minimum-order flux state observer in a stationary reference frame for permanent-magnet synchronous motors

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1 Author(s)
Shinnaka, S. ; Dept. of Electr. Eng., Kanagawa Univ., Yokohama, Japan

This paper proposes a new sensorless vector control method that can be applied to both of salient-pole and nonsalient-pole permanent-magnet synchronous motors (PMSMs). The proposed method estimates the phase of a rotor flux by a newly developed state observer in a stationary reference frame for sensorless vector controls of PMSMs. The flux state observer has the following attractive features: 1) it requires no steady-state conditions for the dynamic mathematical model of the motor; 2) its order is the minimum second; 3) a single observer gain is simply constant over a wide operating range and can be easily designed; 4) it utilizes motor parameters in a very simple manner; and 5) its structure is very simple and can be realized at a very low computational load. The proposed speed-estimation method, which exploits the inherent physical relation of integration/derivation between phase and speed, is very simple and can properly estimate rotor speed. The usefulness of the proposed method is examined and confirmed through extensive experiments.

Published in:

Industrial Electronics, IEEE Transactions on  (Volume:53 ,  Issue: 2 )

Date of Publication:

April 2006

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