Dear colleagues,
the majority of EKF/UKF implementations for speed sensorless control of PMSM are in alpha,beta frame (i.e. observer is implemented in stationary frame). I wonder why? Equations in dq fame are much more simpler, so the computational requirements should be lower. Is there any evidence that observer doesn't work implemented in dq frame?
In my opinion, and to the best of authors’ knowledge; the simplified EKF('i.e. with reduced state dimention),( in dq frame) is used only for speed estimation and without rotor position estimation .... the reason resides mainly in the abc/dq cordinate transformation.... .
Elsewhere, you can read carfully this research paper.Article Torque Ripple Minimization in Predictive Torque Control Meth...
best regards,
To transform in the d-q frame for PMSM we need the rotor position which is being estimated. In general, calculating the estimates from the stationary frame measurements in somewhat easier because it is independent of the parameter being estimated.
If you have an incorrect rotor position estimate for vector control it will result in axis misalignment and the operation will tend to be unstable due to the electromagnetic torque which is a function of the q-axis current.
- Badges
- Science topic
- Similar topics
- Econ
- Manufacturing
- Industry