基于转子磁链模型的永磁同步电机转子位置估计策略

doi:10.19595/j.cnki.1000-6753.tces.170814

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Abstract A rotor position estimation strategy for sensorless permanent magnet synchronous motor based on improved sliding mode observer (SMO) and tangent function phase-locked loop (PLL) is proposed. The improved sliding mode observer utilizes an adaptive feedback gain associated with motor rotor electrical speed to derive a position estimator based on rotor flux model, and constant flux linkage is introduced to calculate the rotor position of the motor to avoid changing speed affect the accuracy of rotor position estimation. In order to avoid the position estimation error in the forward and reverse rotation of the motor, a phase-locked loop structure based on tangent function is established, which makes the system asymptotically stable at each equilibrium point. Compared with the traditional estimation strategy based on back EMF, the strategy proposed in this paper can effectively overcome the problem of inaccurate position estimation at low speed condition and the position estimation error increase caused by steering mutation. The new position estimation strategy proposed in this paper is compared with the traditional strategy based on back EMF, and the comparative experiment results verify the validity and practicability of the proposed strategy.

Key words： Permanent magnet synchronous motor sliding mode observer phase-locked loop flux model tangent function

Received: 12 June 2017 Published: 12 July 2018

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TM301

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.170814 OR https://dgjsxb.ces-transaction.com/EN/Y2018/V33/I13/2963

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