Dear Vugar Mirzayev,

sure, it is possible but you should have a proper mathematical model of the system, it is necessary for the position estimation. Try to use i.e. Extended Kalman Filter.

Best regards

Lukasz Niewiara first thanks a lot for your answer.

I am writing my thesis on that field and I am going to use first two methods.

1. Method is to get rotor angular position by back emf measurements.

2. Method I am going to apply Sliding Mode Observer.

Do you also think by applying these two methods I can get accurate results for both types of motors ?

Thanks in advance.

Dear Vugar Mirzayev,

both IPMSM and SPMSM are three phase AC motors. The diference is the rotor construction. The SPMSM has the magnets mounted on the surface of the rotor, the IPMSM has the magnets mounted inside the rotor what enables to weaking the rotor flux using the d-axis current component. In my opinion in such a case the back emf method should be modyfied taking into account the actual value of rotor flux.

I think that it is possible to get accurate results using both of the methods for both types of motor.

Best regards

@ Lukasz Niewiara, whether field weakening can only be done on IPMSM, is it not possible to have field weakening for SPMSM