Structural Design of Partitioned Stator Doubly Salient Permanent Magnet Generator for Power Output Improvement

Abstract

Partitioned stator doubly salient permanent magnet generators (PS-DSPGs) have been extensively used for electrical generation mainly due to their high reliability, high electromotive force (EMF), and high-power output. Therefore, we aim to improve the output power of a PS-DSPG by designing the optimal configuration of generator pole structure. Electrical characteristics including the magnetic flux linkage distribution, phase EMF, cogging torque, voltage regulation, and power output profile were characterized by using the finite element method. After optimizing the generator pole structure including the angle of air gap arc width, it was found that the proposed PS-DSPG with 18/15 (stator/rotor) pole structure with optimized air gap arc width could produce higher EMF of about 23.24% than a conventional structure because this structure has the suitable number of pole structures. Also, an analysis of voltage regulation and power output profiles under the loaded condition were carried out, and it was indicated that the PS-DSPG based on the suitable 18/15-pole structure could provide the best machine performance where the output power is 11.63% higher than the conventional structure. Hence, the proposed PS-DSPG with 18/15-pole structure can appropriately be utilized for electrical generation, especially in low-speed operated generator applications.

A Novel Asymmetrical-Pole PS-DSPM with Variation of Outer Stator Teeth Number for An Improvement of Electromagnetic Performances

“…However, the rotor iron piece and PM of these proposed machines are determined to be fixed as 8 pieces and 14 pieces, respectively, in order to study particularly the variation of outer stator teeth number. The outer stator teeth parameters of each proposed machine are precisely designed by the numerical linear order method [19]. The designed outer stator teeth parameters and also, the other structural parameters of all proposed machines are indicated in Table 1.…”

“…The machine properties of the PS-DSPM structure are reported in [18]. Additionally, the pole configurations in PS-DSPM consisting of the stator tooth, the rotor pole and the PM number, are an important factor for the influence on the electromagnetic performances [19], [20]. Many studies have presented the development of these pole configurations for improving the PS-DSPM however, the pole configurations must be simultaneously varied as the symmetrical-pole ratio [21].…”

Analysis of the Rotor Magnetomotive Force of Built-In Radial Permanent Magnet Generator for Vehicle

“…Compared with the built-in tangential PMG, the permanent magnet steel (PMS) of the surface-mounted PMG and the built-in radial PMG is closer to the main air gap, and the distance between the PMSs is closer too, so there is less magnetic leakage between them. Moreover, compared with the surface-mounted PMG, the built-in radial PMG has high structural strength and high reliability and therefore has become the future development trend [4][5][6][7]. However, the rotor magnetic field of this generator is provided by two adjacent radial PMSs in series and therefore needs to pass through two PMSs.…”

Electromagnetic Torque Improvement of Doubly Salient Permanent Magnet Machine Using Pole Ratio Adjustment Technique

“…Next, the square envelope and asymmetrical-pole techniques were introduced for achieving larger slot area and lower torque ripple of DSPM (Zhang et al, 2019;Xu et al, 2020). Recently, several structural design techniques have been performed to improve the performance of DSPM, i.e., stator pole configuration design (Sriwannarat et al, 2018;Lounthavong et al, 2019;Lounthavong et al, 2020), partitioned-stator with asymmetrical pole (Sriwannarat et al, 2020a), optimizing the number of poles Sriwannarat et al (2019) and pole configuration adjustment technique (Sriwannarat et al, 2020b).…”