Design of a cost-effective hybrid-magnet multi-flux barrier IPM motor for rare-earth usage reduction in electric vehicles
This study designed an interior permanent-magnet motor combining rare-earth and ferrite magnets with a multi-flux-barrier rotor. Multi-objective optimisation reduced rare-earth magnet use by about 11% and estimated material cost by 7.14%, improving torque-per-cost by 7.43%, while simulations retained back-EMF, torque and efficiency close to the benchmark.