Pole Pitch is naturally equal to the total number of armature slots divided by the number of poles in the machine. If there are 96 slots on the armature periphery and 4 numbers of poles in the machine, the numbers of armature slots come between two adjacent poles centres would be 96/4 = 24. Hence, the pole pitch of that DC machine would be 24. Then the second consideration while selecting number of slot is slot per pole should lie between 9 to 16. When it is 9 we will get slot as 54 when it is 16 slot is 96. From a we got 73 to 103.
2014 IEEE Energy Conversion Congress and Exposition (ECCE)
Year: 2014 | Conference Paper | Publisher: IEEE
Abstract: This paper presents a feasibility study between a design for synchronous reluctance (SyncRel) motors with integer slots/pole, i.e. 36 slots/4poles and fractional slots/pole, slots per pole ratio higher than 3, i.e. 18 slots/4poles configuration. The analysis is extended also to low energy permanent magnet assisted synchronous reluctance motor (PM SyncRel). It is found that the integer slots/pole solution have a better efficiency for SyncRel, while fractional slots/pole solutions benefit the PM SyncRel design. Potentially, integer slots/pole designs might have higher torque ripple and lower power factor than fractional slots/pole solutions. The presence of very low energy permanent magnets, as bonded plastic ferrite leads to significant increase in the constant torque speed range and power output.
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2011 International Conference on Electrical Machines and Systems>1 - 4
Abstract
The PMSG (permanent magnet synchronous generator) with the rated power of 2MW which is driven directly without gear system is designed by equivalent magnetic-circuit method. In order to study the characteristics of permanent magnet generator directly driven by wind turbine with the rated power of 2MW, comparative study of the performance both of no load and rated load was studied under different design features such as the choice of the number of slots per pole and the pole embrace. The results based on FEA (Finite Element Analysis) show that the appropriate choice of slot number per pole and pole embrace has a significant effect on the performance of direct-drive permanent magnet generators. It can weaken the effect of no load voltage harmonics and help the direct-drive permanent magnet generators to obtain the better performance
Identifiers
book ISBN : | 978-1-4577-1044-5 |
book e-ISBN : | 978-1-4577-1043-8 , 978-1-4577-1042-1 |
DOI | 10.1109/ICEMS.2011.6073738 |
Authors
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Liu, Ting
- College of Electrical and Information Engineering, Hunan University, 410082, China
Huang, Shoudao
- College of Electrical and Information Engineering, Hunan University, 410082, China
Deng, Qiuling
- College of Electrical and Information Engineering, Hunan University, 410082, China
Pu, Qingyun
- College of Electrical and Information Engineering, Hunan University, 410082, China
![Fractional number of slots per pole Fractional number of slots per pole](https://en.engineering-solutions.ru/files/images/motor/pmsm/rotor_ipmsm.jpg)
Keywords
TorquePermanent magnetsWind turbinesForgingSynchronous generatorsHarmonic analysis
TorquePermanent magnetsWind turbinesForgingSynchronous generatorsHarmonic analysis