Abstract
This paper compares permanent magnet synchronous motors with rare earth permanent magnets (PM) and those with ferrite PM, and it suggests that ferrite PM can replace rare earth PM. Therefore, the two models with the same output were compared and analyzed by comparing the mechanical and electromagnetic characteristics. Finally, the study is validated experimentally.
Highlights
High-speed permanent magnet (PM) motor has been used in many industrial fields with high output and high efficiency by using rare-earth PM having high coercive force and residual magnetic flux density due to the development of PM manufacturing technology.1,2 it is difficult to use rare earth PMs in mass production owing to the unstable supply of rare earths and their high cost
In order for ferrite PM with relatively low residual magnetic flux density to obtain the same output as rare earth PM, proper rotor and stator design is needed to secure magnetic force
Because it is a high-speed motor, the Torque per unit rotor volume (TRV) values were selected in the range of 7–14 for the ferrite PM model and 14–42 for the rare earth PM model
Summary
High-speed permanent magnet (PM) motor has been used in many industrial fields with high output and high efficiency by using rare-earth PM having high coercive force and residual magnetic flux density due to the development of PM manufacturing technology. it is difficult to use rare earth PMs in mass production owing to the unstable supply of rare earths and their high cost. High-speed permanent magnet (PM) motor has been used in many industrial fields with high output and high efficiency by using rare-earth PM having high coercive force and residual magnetic flux density due to the development of PM manufacturing technology.. In order for ferrite PM with relatively low residual magnetic flux density to obtain the same output as rare earth PM, proper rotor and stator design is needed to secure magnetic force. The high-speed PM synchronous motor design considering the electromagnetic-mechanical characteristics was carried out to manufacture two models with Fig. 1(a) rare earth PM or Fig. 1(b) ferrite PM. Based on the comparison results, it is suggested that ferrite PM, a non-rare earth magnet, can replace rare earth PM in the manufacture of high-speed PM synchronous motor
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