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A new brushless doubly-fed double stator double rotor (DSDR) generator based on permanent magnet field modulation for the wind power application is proposed in this paper. This generator adopted double stator to achieve the decoupling of the control winding and power winding. To improve the power density, a freely rotating rotor is introduced. To achieve the variable-speed constant-frequency operation...
The HEFS machines were proposed by reducing the permanent magnet (PM) length of a flux-switching permanent magnet (FSPM) machine and introducing a set of field windings into the saved space. Thus, the HEFS machines shares the identical motor laminations, meanwhile different PM and field winding locations. Based on 2D finite element analysis (FEA), this paper is focused on the comparison of electromagnetic...
This paper presents a new sensorless starting method for 12/8-pole doubly salient permanent-magnet (DSPM) motors. The method can detect the rotor position at standstill, and then a specific start-up method is used to accelerate the motor up to a middle-speed where conventional sensorless control algorithms based on the back-EMF can work properly. The proposed scheme employs only one current sensor...
The doubly salient permanent magnet (DSPM) machine with full-pitched windings has the advantages such as high power density and high reliability, which has the potential in the applications of wind power generation. There are different ways to improve the full pitched DSPM machine for high performance. Then three topologies of the full pitched DSPM generator are proposed in this paper. The structure...
The conventional doubly salient permanent magnet (DSPM) machine has concentrated windings in stator and unipolar flux linkage. This paper presents a novel single phase DSPM generator with full-pitched winding, offering higher efficiency and less copper consumption. The static characteristics of the proposed DSPM generator are analyzed based on the finite element method. It is shown that the full-pitched...
A new fault diagnosis method of inter-turn short circuit detection in generator rotor windings based on wavelet transform is presented. The detection method is based on the singularity characteristics of the induced electromotive force signal of search coil in the air gap. Electromagnetism characteristic of turbo-generator rotor windings is analyzed. Wavelet transform was applied to the detection...
This paper reviews the concepts, developments and applications of the novel permanent magnet brushless machines having magnets and windings in the stator with particular emphasis on operation principles, electromagnetic performance, design and control aspects. The key features of the machines are summarized. Moreover, the recent development and emerging research directions of the machines are also...
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