Abstract
To prevent irreversible demagnetization of a permanent magnet (PM) for interior permanent magnet synchronous motors (IPMSMs) by flux-weakening control, a robust PM flux-linkage nonsingular fast terminal-sliding-mode observer (NFTSMO) is proposed to detect demagnetization faults. First, the IPMSM mathematical model of demagnetization is presented. Second, the construction of the NFTSMO to estimate PM demagnetization faults in IPMSM is described, and a proof of observer stability is given. The fault decision criteria and fault-processing method are also presented. Finally, the proposed scheme was simulated using MATLAB/Simulink and implemented on the RT-LAB platform. A number of robustness tests have been carried out. The scheme shows good performance in spite of speed fluctuations, torque ripples and the uncertainties of stator resistance.
Highlights
Permanent magnet synchronous motors (PMSMs) are widely used as motors in electric vehicles, electrical traction systems, industrial applications, wind generation and defense, due to their high energy efficiency, high torque-to-weight ratio, high power factor, fast response, rugged construction and reliable operation [1,2,3]
Permanent magnet (PM) demagnetization faults often occur in the practical application of PMSMs by flux-weakening control and, in severe cases, even cause irreversible demagnetization [4]
The main contribution of this study is to propose a robust nonsingular fast terminal-sliding-mode observer (NFTSMO) to detect PM flux-linkage demagnetization faults for interior permanent magnet synchronous motors (IPMSMs) by flux-weakening control
Summary
Permanent magnet synchronous motors (PMSMs) are widely used as motors in electric vehicles, electrical traction systems, industrial applications, wind generation and defense, due to their high energy efficiency, high torque-to-weight ratio, high power factor, fast response, rugged construction and reliable operation [1,2,3]. To prevent PM demagnetization, many solutions [5,6,7] have been proposed for optimizing the magnetic circuit and, reducing the risk of PM demagnetization from the motor-design standpoint; this may lead to increasing manufacturing cost, but can reduce maintenance costs. This approach is referred to as the static prevention method. A dynamic monitoring method can provide accurate PM flux-linkage information by online monitoring of the PMSM control system, which can effectively prevent the occurrence of more serious demagnetization and decrease the extent of irreversible demagnetization
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