Abstract
The doubly salient permanent magnet (DSPM) machines are very attractive for low-speed power generation. In this work, we propose a design technique to improve the output power of the DSPM generator by an adjustment of pole configuration. The number of stator and rotor poles, split ratio, as well as the stator pole arc of the generator, were proposedly adjusted and optimized. The output characteristics of the generator including the magnetic flux linkage, electromotive force, harmonic, cogging torque, electromagnetic torque, output voltage and output power were analyzed through finite element analysis. The symmetrical magnetic field distribution of all generators was firstly verified. Then, the results indicated that this particular generator was optimized at 18 stator poles and 12 rotor poles, while the split ratio and the stator pole arc should be set as 0.78 and 6.15 degrees, respectively. The proposed optimal generator could provide a significant improvement in the output voltage and the output power compared to the conventional structure. The output power of 1.28 kW can be reached by the optimal structure, which was two times higher than that of the conventional structure. The physical explanation regarding to the structural modification was also given. The proposed design technique can be applied for improving the output power of the DSPM machines.
Highlights
Permanent magnet (PM) machines have received considerable research attraction over the past decades mainly due to their outstanding features, such as high torque density, high power density, high reliability, robust structure and low thermal impact [1,2]
The results indicated that both magnetic flux linkage and electromotive force (EMF) were strongly impacted by a variation of stator pole arc
A design technique to improve the electromagnetic performance of doubly salient permanent magnet generator (DSPMG) was
Summary
Permanent magnet (PM) machines have received considerable research attraction over the past decades mainly due to their outstanding features, such as high torque density, high power density, high reliability, robust structure and low thermal impact [1,2]. The DSPM machines, in which all PMs are located at the stator slot opening, incorporate remarkable qualifications over the other machine types, such as simple configuration, high efficiency, high power density, good mechanical integrity and robustness [12,13,14]. These machines indicate high cost efficiency, since they require less magnet volume compared with the conventional PM synchronous machines. Several outstanding properties of the DSPMG were reported afterward [5,16,17]
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