Analytical modelling and optimisation of line start LSPM synchronous motors

This study presents a comprehensive analytical analysis of line start permanent magnet (LSPM) synchronous motors in both steady-state and transient domains. The PM flux, the back-EMF and the winding inductances are first calculated in the steady-state based on the hybrid solution of magnetic circuit...

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Bibliographic Details
Published in:IET electric power applications 2020-03, Vol.14 (3), p.398-408
Main Authors: Ghahfarokhi, Mohammadreza M, Aliabad, Aliakbar Damaki, Boroujeni, Samad Taghipour, Amiri, Ebrahim, Faradonbeh, Vahid Zamani
Format: Article
Language:English
Subjects:
back‐EMF voltage
comprehensive analytical analysis
finite element analysis
genetic algorithms
hybrid solution
individual motor torque components
line start permanent magnet synchronous motors
line start PM synchronous motors
magnetic circuit
magnetic circuits
magnetic islands
motor voltage relations
optimisation constraint
permanent magnet motors
presented analytical modelling
Research Article
starting capability
steady‐state performance
synchronous motors
torque
transient domains
transient speed response
winding inductances
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Summary:This study presents a comprehensive analytical analysis of line start permanent magnet (LSPM) synchronous motors in both steady-state and transient domains. The PM flux, the back-EMF and the winding inductances are first calculated in the steady-state based on the hybrid solution of magnetic circuit and the magnetic islands. Next, the motor voltage relations are mapped into an arbitrary d-q reference frame to dynamically assess the transient speed response as well as the individual motor torque components. Based on the presented analytical modelling, the parameters of the motor are optimised via genetic algorithm to maximise the back-EMF voltage and the overall steady-state performance. Given the parabolic relation between the back-EMF and the braking torque, the starting capability of the motor is defined as the optimisation constraint. Finally, the analytical results are verified by using a finite element analysis software package.
ISSN:1751-8660
1751-8679
1751-8679
DOI:10.1049/iet-epa.2019.0644