Sensorless Speed Control of Axial Gap Permanent Magnet Motor Using Sliding Mode Observer
Keywords:back-emf, sliding mode, axial gap self-bearing motor, PLL, PMSM
The permanent magnet synchronous motor drive system incorporates magnetic bearings to perform high speed control and balance rotor control between the two stators. The paper designed a system to perform adjusting motor speed sensor-less based on measured current, axial position and voltage reference components. The electromotive force (back-EMF) generated in the stator is estimated by a Sliding mode observer. The angular position and velocity rotor is calculated through the α-β com-ponents of the back-EMF. An improved phase-locked loop to correct the estimated angular position to exactly follow the true value. The motor drive is built in a vector control structure based on field-oriented control. The simulation results show that the proposed phase-locked loop-coupled observer is fully capable of meeting system control requirements in the medium speed range and above.
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