Flux weakening control of permanent magnet machine based aircraft electric starter-generator

Abstract

This paper presents control analysis and design for an aircraft electric starter-generator system based on a Permanent Magnet Machine (PMM) operated in Flux-Weakening mode (FW). The focus is on detailed stability analysis which helped to discover an intrinsic instability when operating the PMM in FW mode. An adaptive voltage magnitude controller, including a variable current limit, is proposed and shown to guarantee stable operation. The analytical findings are verified by experimental investigation.

Attenuating saturated-regulator operation effect of brushless DC motors through genetic-based fuzzy logic estimator

“…This is realized by advancing the phase angle of the currents with reference to the back emf. There are many studies that address the issue of FW operation from various aspects [6][7][8][9][10][11][12][13]. As already emphasized, the conventional FW method has severe disadvantages such that it leads to more power losses in the motor and inverter as well as has the risk of irreversible demagnetization of the permanent magnets [6][7][8][9][10].…”