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This paper proposes a comparison among FEA field models combined with analytical model, in order to predict with better accuracy the NEMA/IEC performance indicators. Such indicators are the locked-rotor current, efficiency, breakdown torque and locked-rotor torque. The Stationary (S), Time-Harmonic (TH) and Time-Stepping (TS) models have been compared with different simulation features, such as: linear...
Computationally Efficient - Finite Element Analysis (CE-FEA) is detailed and demonstrated on a design optimization study for a sine-wave current regulated Interior Permanent Magnet (IPM) machine. In CE-FEA symmetries of electric and magnetic circuits of AC machines are fully exploited to minimize the number of required magnetostatic solutions. CE-FEA employs Fourier analysis and is capable of accurately...
The paper deals with the derivation of the inductances of permanent magnet synchronous machines equipped by distributed windings and those equipped by concentrated ones. A special attention is paid for the determination of the leakage inductances. A case study is considered where the stator magnetic circuit has the same geometrical parameters for both machines. The calculated inductances are compared...
The influence of flat magnets (FM) in surface- mounted permanent magnet machines (PMM) is analyzed taking the conventional single curved magnet (SCM) configuration as reference. The flat shape of magnets and the air gap between them increase the magnetic circuit reluctance and distort air gap flux density. As a consequence, the back electromotive force (BEMF) decreases due to a reduction in the fundamental...
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