Abstract
Harmonics can be injected into the permanent magnet (PM) shape to maximize the output torque in five-phase machines. The optimal harmonics of different orders for maximum torque is mathematically derived and validated by the finite element (FE) method in this paper. The output torque of the five-phase machine with sinusoidal shape can be improved by 12.5% by injecting the optimal third harmonic. Meanwhile, 3.2% further more torque improvement can be obtained with the optimal third and fifth harmonics injected. However, the output torque barely change with the seventh harmonic injection. The torque ripple of the machines with shaped PMs is much lower than the machines with conventional tile PM. The electromagnetic performance for all the machines including back electromotive force, average torque, torque ripple, etc., are compared. Finally, the five-phase machine with third and fifth harmonics injection into the rotors is prototyped to verify the analytical and FE analyses.
| Original language | English |
|---|---|
| Article number | 7857071 |
| Pages (from-to) | 4434-4443 |
| Number of pages | 10 |
| Journal | IEEE Transactions on Industrial Electronics |
| Volume | 64 |
| Issue number | 6 |
| Early online date | 15 Feb 2017 |
| DOIs | |
| Publication status | Published - 1 Jun 2017 |
Funding
Manuscript received August 1, 2016; revised November 13, 2016; accepted December 10, 2016. Date of publication February 15, 2017; date of current version May 10, 2017. This work was supported in part by the National Natural Science Foundation of China under Project 51607089, in part by the Natural Science Foundation of Jiangsu Province under Project BK20150744, and in part by the Fundamental Research Funds for the Central Universities under Grant NE2016003.
Keywords
- Average torque
- five-phase machine
- harmonics injection
- magnet shaping
- torque ripple
ASJC Scopus subject areas
- Control and Systems Engineering
- Electrical and Electronic Engineering