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.
The asymmetrical-pole ratio installed in the partitioned stator doubly salient permanent magnet machine (PS-DSPM) is proposed. Its particular outer stator teeth number is varied to improve the electromagnetic performances. The electromagnetic indicators including the magnetic flux distribution, magnetic flux linkage, back-electromotive force (back-EMF), cogging torque, electromagnetic torque, and ripple torque are investigated and then, compared with the conventional PS-DSPM by finite element analysis simulation. The results illustrate that the symmetrical distribution of the magnetic flux firstly is achieved by all proposed machines. The flux linkage magnitude is increased due mainly to the increase of the magnetic flux paths and winding slots when the increased outer stator teeth number. Especially, we found that the asymmetrical-pole PS-DSPM with 30 outer stator teeth has the suitable outer stator teeth number since it can produce the higher back-EMF waveform with a robust outer stator structure than the other proposed machines as well as a conventional machine. Moreover, the average electromagnetic torque with small ripple torque is reached by this proposed machine, which is 39.29% enhanced from the conventional one under the same copper loss. Hence, the asymmetrical-pole PS-DSPM having 30 outer stator teeth is the novel alternative machine for PS-DSPM improvement.
This paper introduces the pole ratio adjustment technique to improve the torque characteristics of the doubly salient permanent magnetic machine (DSPM). The electrical characteristics of the machine, namely the magnetic field distribution, flux linkage, back-electromotive force (EMF), and cogging torque, were obtained under open-circuit conditions. The electromagnetic torque and ripple torque were examined under the loaded condition. The simulations, based on the 2D-finite element method, show that the optimal pole ratio for the DSPM structure is with 18 stator teeth and 15 rotor poles. This optimal structure achieves a larger phase back-EMF than the conventional structure, as well as had a better magnetic flux path with a reasonable cogging torque. The on-load test also confirmes that the proposed optimal structure can produce a significantly higher electromagnetic torque than the conventional machine while maintaining a satisfactory torque ripple. Furthermore, an experimental prototype of the DSPM structure having 18/15 stator/rotor poles was fabricated and tested to verify the simulations. The experimental results were in good agreement with the simulations. The design technique and the fabricated prototype demonstrate the DSPM utilization for low-speed/high torque applications.
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