Adaptive Two-Stage Extended Kalman Filter Theory in Application of Sensorless Control for Permanent Magnet Synchronous Motor

Table 1

PMSM prototype specification.

Quantity	Value
Nominal torque	4 Nm
Nominal speed	3000 rpm
Stator resistance 𝑅𝑠	0.525 Ω
𝑑 axes inductances 𝐿𝑑	1.65 mH
𝑞 axes inductances 𝐿𝑞	1.65 mH
PM Flux linkage 𝜓𝑓	0.0744 Wb
Rotor inertia	0.54 × 10^−3 kg·m^2
Poles pairs	4