Speed Sensor-Less Control System of Surface-Mounted Permanent Magnet Synchronous Motor Based on Adaptive Feedback Gain Supertwisting Sliding Mode Observer

Table 3

Back-EMF fluctuation.

Result	FFG-STA-SMO	AFG-STA-SMO	Unit
Error (a)	0.3225	0.175	Rpm
Error (b)	0.275	0.0975	Rpm
Error (c)	0.27	0.27	Rpm
Position error (a)	0.0043	0.0007	Deg
Position error (b)	0.00037	0.00009	Deg
Position error (c)	0.00016	0.00016	Deg