Abstract
This paper uses formal mathematical optimization techniques based on parametric finite-element-based computationally efficient models and differential evolution algorithms. For constant-power applications, in the novel approach described, three concurrent objective functions are minimized: material cost, losses, in order to ensure high efficiency, and the difference between the rated and the characteristic current, aiming to achieve very high constant-power flux-weakening range. Only the first two objectives are considered for constant-Torque applications. Two types of interior permanent magnet rotors in a single-and double-layer V-shaped configuration are considered, respectively. The stator has the typical two slots per pole and phase distributed winding configuration. The results for the constant-Torque design show that, in line with expectations, high efficiency and high power factor machines are more costly, and that the low-cost machines have poorer efficiency and power factor and most importantly, and despite a common misconception, the saliency ratio may also be lower in this case. For constant-power designs, the saliency ratio can be beneficial. Nevertheless, despite a common misconception, when cost is considered alongside performance as an objective, a higher saliency ratio does not necessarily improve the power factors of motors suitable for ideal infinite flux weakening.
Original language | English |
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Article number | 7534769 |
Pages (from-to) | 4730-4739 |
Number of pages | 10 |
Journal | IEEE Transactions on Industry Applications |
Volume | 52 |
Issue number | 6 |
DOIs | |
State | Published - Nov 1 2016 |
Bibliographical note
Funding Information:National Science Foundation
Publisher Copyright:
© 1972-2012 IEEE.
Keywords
- Constant-power operation
- design optimization
- differential evolution (DE)
- finite-element analysis (FEA)
- maximum torque per ampere (MTPA)
- permanent magnet (PM) machine
- power factor
- saliency ratio
ASJC Scopus subject areas
- Control and Systems Engineering
- Industrial and Manufacturing Engineering
- Electrical and Electronic Engineering