Performance Improvement of Concentrated-Flux Type IPM PMSM Motor with Flared-Shape Magnet Arrangement

Abstract

This study demonstrates that the use of a flared-shape rotor structure in interior permanent magnet (IPM) permanent magnet synchronous motor (PMSM) yields better performance than the basic IPM PMSM motor, using a spoke structure with ferrite magnets. To concentrate the effective magnetic flux, the proposed rotor structure is composed of a number of ferrite magnets, which are inserted in a flared shape in the rotor core. This paper shows the comparison with the analysis results of 2D finite element method (FEM), and it is shown that the proposed IPM PMSM motor can be an effective substitute for the basic IPM PMSM motor, which requires low torque ripple and high efficiency. In particular, the proposed flared IPM PMSM motor has lower pulsation of torque and superior efficiency, as well as lower acoustic noise and vibration, compared to the basic IPM PMSM motor. To verify the performance improvement of the proposed model, a prototype of the proposed model was manufactured. It was experimentally confirmed that the proposed model has lower torque ripple and higher efficiency than the basic model. Based on this performance improvement, the proposed flared IPM PMSM motor is suitable for electric vehicles and home appliances.

Performance Enhancement of High Speed Interior Permanent Magnet Synchronous Motors Using Superior Magnetic Material

“…The stator core, teeth and rotor core were designed using M19 (non-oriented silicon steel) material. M19 material exhibits a saturation level of 1.8 T [25]. The 0.5 mm of air-gap thickness is taken into account for all three ratings.…”

Approximation of Permanent Magnet Motor Flux Distribution by Partially Informed Neural Networks

“…Such flux distortions cause higher harmonics in no-load EMF and torque deformations. The influence of motor construction on the flux distribution, EMF, and torque are well described [21][22][23]. Especially, for interior permanent magnet motors, where the magnets are embedded inside the rotor, deformation of flux distribution is non-negligible and the simplified model (1) is unacceptable.…”

Design of External Rotor Ferrite-Assisted Synchronous Reluctance Motor for High Power Density

“…Low-cost ferrite permanent magnets (Fe-PM) such as Y30 and Y32H grades PMs have been considered alternative options in the industry [4,5]. Various design approaches have been suggested to increase the torque and power density, such as multi-phase windings, outer rotor structure, salient type rotors, spoke-PM rotor, and transverse flux topology [6][7][8][9][10]. However, maintaining high torque density while ensuring demagnetization-free operations has been challenging until recently due to Fe's low coercive force and low energy density.…”

“…Instead, Fe-PMaSynRM can offer low-cost, better constant power-speed range, and comparable torque density compared to RE-PM-based IPM [13][14][15]. Thus, extensive research has been conducted on Fe-PMaSynRM to achieve high torque density, torque ripple, risk of irreversible demagnetization and mechanical deformation [6,[16][17][18].…”