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In order to analyze the magnetic field distribution and thrust performance of the U-channel air-core permanent magnet linear synchronous motor (UAPMLSM), an analytical model is proposed based on the equivalent magnetization intensity method. The detailed analytical solutions of the magnetic flux density and thrust considering space harmonic components are derived, and then validated by the finite-element...
In this paper, an optimal design method of a high power permanent magnet synchronous generator (PMSG) turbine by wind is proposed. The expression of the cogging torque was studied based on the Fourier analysis. A method of permanent magnet shifting to reduce cogging torque was presented. In this paper a prototype for 5MW generator was built and a comparative study of the performance both of no load...
Two permanent magnet synchronous motors (PMSM) whose rotor magnetic circuit structures were radial and tangential were designed. vector potential and energy methods were used to calculate the electromagnetic parameters of the motors. Based on the mathematical model, the torque characteristics were calculated, control performances within constant torque and constant power control area were analysed...
High-performance motor drive applications require smooth torque with minimum torque ripple. Considering the structure characteristic of surface-mounted permanent magnet machine, this paper describes the causes of torque ripple of it. From a machine design standpoint, the paper has analyzed the reasons that cause torque ripple generated by the interaction between the motor current and harmonic back-EMF,...
Cogging torque is one of the important issues for permanent magnet machines. Due to the interaction between the permanent magnets and slotted armature lamination, there exists cogging torque in slotted permanent magnet machines, which may cause noise and vibration. To reduce the cogging torque, the expression of the cogging torque was studied based on the Fourier analysis in this paper. Based on the...
This paper analyzed the no load air gap flux density waveform of surface mounted permanent magnet synchronous motor (PMSM) and then proposed a new method to improve the air gap flux density waveform. Multiple permanent magnets are adopted as a main pole for motor instead of a single one, and the mathematical model to eliminate the harmonics is derived. According to the mathematical model, a PMSM finite...
Nowadays, there has been much interest and studies in direct-drive permanent magnet synchronous generator (PMSG) due to its high efficiency and reliability with the rapid development of the power semiconductor devices. MW class permanent magnet synchronous generator (PMSG) is an important trend for larger capacity and higher power density. The present paper is aimed to outline the design, including...
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