A Speed Sensor Fault-Tolerant Control of the CPPM Machine for Electric Vehicle

Zheran Li, Yesong Li, Xinhua Li

Abstract


A speed sensor fault-tolerant control (FTC) strategy for electric vehicle is proposed in electric vehicles using a consequent-pole permanent-magnet (CPPM) machine. In order to obtain good FTC performance at low speed region, a HF voltage injection method is proposed to detect the rotor position from the magnetic saliency. This magnetic saliency of a CPPM machine is analysed by the finite-element analysis (FEA), and the high-frequency (HF) impedances are measured to confirm the saliency. At high speed range, the extended-electromotive force (EMF) method is applied when the failure of the speed sensor is detected. The speed sensor FTC strategy is verified effective by experimental results on a 25kW CPPM machine at different operating conditions. The reliability is enhanced and smooth transition to the fault-tolerant operation is realized.

DOI: http://dx.doi.org/10.5755/j01.eee.20.7.5087


Keywords


CPPM machine; Electric vehicle; Speed sensor fault-tolerant; High-frequency signal injection; Extended-EMF.

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Print ISSN: 1392-1215
Online ISSN: 2029-5731