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

Table 2

Back-EMF fluctuation.

Result	Ea1	Ea2	Unit
Back-EMF fluctuation (a)	7.34~7.32	7.325~7.315	V
Back-EMF fluctuation (b)	22.05~21.925	22.025~22.015	V
Back-EMF fluctuation (c)	80.9 ~ 80.5	80.7 ~ 80.69	V