外文翻譯---電動(dòng)汽車外轉(zhuǎn)子定子pm無(wú)刷電機(jī)驅(qū)動(dòng)器的比較-在線瀏覽
2024-10-02 17:12本頁(yè)面
【正文】 its different field patterns at different field excitations (?350 Aturns, 0 Aturns, and +1000 Aturns). It verifies that PMHB motor drive has the flux controllable ability.Fig. 5. Magnetic field distributions. (a) DSPM. (b) PMHB with ?350 Aturn. (c) PMHB with 0 Aturn. (d) PMHB with +1000 Aturns.V. COMPARISON OF MOTOR DRIVE PERFORMANCES Based on the same peripheral dimensions and the identical outerrotor configuration, the two statorPM motor drives are designed. Their corresponding design data are listed in Table I.Since the DSPM motor can acmodate more PMs than the PMHB one, its power density is 167% of the PMHB one. However, this merit in power density is offset by the high cost of PMs. From Table I, it can be seen that the DSPM motor utilizes the PM volume up to 502% of the PMHB one. Based on the present international rates, the PM material cost of the DSPM motor is US$ as shown in Table II, which is much higher than the US$ of the PMHB one. Hence, it leads to the total material cost of the DSPM motor is over 174% of the PMHB one. The corresponding cost per unit power and per unit torque of the PMHB motor is significantly less than that of the DSPM one. Thus, the PMHB motor is much more costeffective than that of the DSPM one. TABLE I PARAMETERS OF DSPM AND PMHB MOTOR DRIVES Armature current density5 A/mm2Armature phases3Rotor outside diameter mmRotor inside diameter mmAirgap length mmStack length mmPM excitationNdFeBPM remanent flux densityField excitationDC field windingsRated power kW2 kWRated torque34 Nm20 NmRated voltage380 V220 VShaft diameter 70 mm40 mmSpeed900 rpm04000 rpmPower density122 W/kg73 W/kgPM volume cm3 cm3DC winding volume cm3TABLE IICOSTING OF DSPM AND PMHB MACHINESItemsDSPM machinePMHB machinePM cost USD USDDC winding cost USDArmature winding cost USD USDIron cost USD USDTotal material cost USD USDCost per unit torque USD/Nm USD/NmCost per unit power USD/kW USD/kWBy using the CFTTSFEM, the electromagnetic characteristics of the two motor drives are calculated and pared. Fig. 6 shows the airgap flux density distributions of both motor drives, indicating that the PMHB motor drive can offer a very wide range of flux control (up to 9 times). Then, the flux linkage of the DSPM machine at full magnetization level is shown in Fig. 7(a), whereas those of the PMHB machine are puted at different magnetization levels with various field currents and shown in Fig. 7(b). It can be seen that the two motor drives have the similar forms of flux linkages, but have different amplitudes. Due to the use of more PMs, the DSPM motor drive can definitely produce higher torque than the PMHB motor one. Nevertheless, as shown in Fig. 8, the PMHB motor drive can utilize flux strengthening to achieve the torque up to % of the DSPM motor one, even though its PM volume is only % of the DSPM one. Also, since the PMHB motor drive inherently provides low airgap flux density than the DSPM motor one while they have a similar toothslot structure, the PMHB motor drive can offer significantly lower cogging torque than that the DSPM motor one as depicted in Fig. 9. It also illustrates that the cogging torque of both motor drives is small due to the use of concentrated armature windings with 36/24 fractionalslot structure. When the two motor drives run in the starting mode, their transient torque responses (normalized by the rated values) are pared as shown in Fig. 10. When they start a load torque of 40 Nm, their armature currents can still be limited to 2 times the rated value. It can be also found that the PMHB motor drive can produce much higher starting torque in the presence of flux strengthening at 750 Aturn. When both of the statorPM machines work in the generation mode, their noload EMF waveforms at different speeds are shown in Fig. 11. Because of uncontrollable flux, the DSPM machine generates speeddependent EMF waveforms. On the contrary, the PMHB machine can uniquely achieve constantamplitude EMFs by the use of flux strengthening at 250 rpm and flux weakening at 1000rpm, which covers all the constantpower speed range of the inwheel EV drive. Hence, the PMHB machine can keep the constant output voltage for directly charging the battery.Fig. 6. Airgap flux density distributions. (a) DSPM. (b) PMHB.VI. CONCLUSIONTwo emerging statorPM motor drives (the DSPM and the PMHB types) have been quantitatively pared. Based on the same peripheral dimensions and outerrotor 36/24pole topology, the two motor drives have undergone detailed performance analysis. Compared with the DSPM motor drive, the PMHB motor drive takes the definite merit of fl
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