Position sensing of permanent magnet machine position sensorless drive at high speed with low sample over rotor operating frequency ratio
Journal
2017 IEEE 3rd International Future Energy Electronics Conference and ECCE Asia
Pages
1205-1209
ISBN
9781509051571
Date Issued
2017
Author(s)
Abstract
This paper improves the permanent magnet (PM) machine position sensorless drive specifically for high speed operation. To obtain the rotor position, an approximation is typically assumed on the position estimator where the estimated position is almost equal to the actual position per sample instant. This small signal approximation might not be valid at high speed when the ratio of sampling frequency over the rotor operating frequency is lower than 10. In this paper, the limitation of EMF-based sensorless drive at high speed is analyzed. By modifying the position estimator without the small signal approximation, it is shown that the drive can improve to operate at the speed of 30-krpm with only five sampling points per electrical cycle (f sample /f e =5). A PM machine is experimentally evaluated to verify the proposed estimation method.
SDGs
Publisher
Institute of Electrical and Electronics Engineers Inc.
Type
conference paper