Abstract:
The main goal of the thesis is to offer new solutions for the sensorless control system
of the permanent magnet synchronous machines in a wide speed range.
A novel concept called “active flux” is introduced for unified motion sensorless AC
drives and particularity, in this thesis for the IPMSM and PM-RSM.
The key element of a sensorless controlled drive is the estimation of the rotor
position and speed. Different estimation methods exist in the literature, but achieving
low speed operation was possible by now only with the signal injection method.
Based on the “active flux”, this estimation is now achieved much simpler and with
less computation effort than using signal injection mehod.
To show the versality of the novel active flux concept, experimental results from two
different experimental platforms, containing two PMSMs prototypes (the IPMSM and
PM-RSM) and with four proposed control methods (vector control, direct torque
control and two equivalent proposed strategies for wide speed range ) are presented
and discussed.
Consequently, once the performance of the position sensorless control drive is
presented, the position sensored one is not included in the thesis.
