This paper presents a novel method to eliminate the need for a position sensor in permanent magnet linear motor (PMLM) drives, by using modified Kalman filter estimation algorithm. Due to end effects, the PMLM must operate at large speed dynamics, and its lowest speed can go down to zero velocity. This problem is overcome by using sinusoidal open loop current control for speeds below 0.1m/s. The Kalman filter is engaged when the speed goes above 0.1 m/s. In the investigation, the control and estimation algorithm, together with the PMLM are simulated in MATLAB and SIMULINK. After that, the drive system is implemented in hardware with a DSP controller board. Results show that the Kalman filter is capable of estimating system states accurately and reliability without mechanical sensors. Together with the low-speed open-loop control, the PMLM can be operated under trajectory tracking mode without any position sensors.
|Number of pages||5|
|Journal||PESC Record - IEEE Annual Power Electronics Specialists Conference|
|Publication status||Published - 1 Jan 2001|
|Event||2001 IEEE 32nd Annual Power Electronics Specialists Conference - Vancouver, BC, Canada|
Duration: 17 Jun 2001 → 21 Jun 2001
ASJC Scopus subject areas
- Electrical and Electronic Engineering