Fig. 1. Rotor position estimator
Fig. 2. Conventional rotor position estimator
Fig. 3. Block diagram for time constant analysis
Fig. 4. Time constant by the operation frequency (a) Time constant (b) Enlarged waveform
Fig. 5. Proposed rotor position estimator
Fig. 6. HPF bode plot analysis (a) HPF with fixed cutoff frequency (b) HPF with variable cutoff frequency
Fig. 7. Applying method
Fig. 8. Vector diagram of estimated flux
Fig. 9. Phase lead compensator block diagram
Fig. 10. Proposed flux based sensorless control
Fig. 11. Experiment set (a) Control board (b) Stator (c) Rotor
Fig. 12. Vector diagram of estimated flux
Fig. 13. Flux estimation performance at 50 rpm (a) Conventional method (b) Proposed method
Fig. 14. Flux estimation performance at 200 rpm (a) Conventional method (b) Proposed method
Fig. 15. Flux estimation performance at 600 rpm (a) Conventional method (b) Proposed method
Fig. 16. Flux estimation of proposed method (a) 600rpm (b) 1200rpm
Fig. 18. Phase error at 50rpm (a) Conventional method (b) Proposed method
Fig. 17. Phase compensation by rotor speed (a) 50rpm (b) 200rpm (c) 600rpm (d) 1200rpm
Fig. 19. Phase error at 200rpm (a) Conventional method (b) Proposed method
Fig. 20. Phase error of proposed method (a) 600rpm (b) 1200rpm
Table 1. Experiment parameter
Table 2. Cutoff frequency of HPF in experiment
참고문헌
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