Comparison of a linear and a non-linear state observer for sensorless control of PM machines
- Resource Type
- Authors
- Manfred Schroedl; Florian Demmelmayr; Markus Troyer
- Source
- 2013 IEEE International Symposium on Sensorless Control for Electrical Drives and Predictive Control of Electrical Drives and Power Electronics (SLED/PRECEDE).
- Subject
- Engineering
Observer (quantum physics)
business.industry
Rotor (electric)
Traction (engineering)
Counter-electromotive force
law.invention
Nonlinear system
Control theory
law
Position (vector)
Inverse trigonometric functions
State observer
business
- Language
This paper presents two different state observers for position-sensorless control of permanent magnet synchronous machines (PMSMs). Both methods improve the angular rotor position and determine the machine speed of a back electromotive force (back-EMF) model [1]. The Arctan observer calculates the electrical rotor position from real and imaginary flux-linkage components with a common arctangent function. A novel observer with non-linear feedback coefficients, called Sin/Cos observer, omits this calculation and improves the quality of the position information. Dynamic measurements on an outer rotor traction machine [2] verify the characteristics of the presented observer techniques.