In Permanent-Magnet Synchronous Generators (PMSGs) the reduction of cogging torque is one of the most important problems in their performance and evaluation. In this paper, at first, a direct-drive vertical-axis wind turbine is chosen. According to its nominal value operational point, necessary parameters for the generator is extracted. Due to an analytical method, four generators with differen...

Permanent magnet synchronous motors (PMSMs) having high power density and efficiency are rigorously researched in various premium applications. Among PMSMs, many studies have been conducted on interior permanent (IPMSMs) to improve torque ripple, but its accurate estimation is not straightforward. Therefore, a six-pole nine-slot (6p/9s) IPMSM adopted as base model due popularity academia indust...

This paper presents the design considerations for a fractional slot multi-phase modular permanent magnet (PM) machine with single-layer concentrated windings. The winding factors for various slot/pole number combinations are calculated to identify the optimal slot/pole number combinations for different phase numbers. In addition, the electromagnetic performance influenced by flux gaps (FGs), su...

This paper presents a new method to find available slot–pole combination of a permanent magnet (PM) vernier motor with fractional-slot concentrated winding (FSCW) configurations instead of the conventional design rule. To this aim, for a common structure of PM vernier machines with FSCW, the air gap flux densities including modulation flux due to vernier effects are investigated from the magnet...

The calculation and reduction of cogging torque are fundamental to the evaluation optimisation motor performance. Considering that accuracy calculated by analytical method (AM) is low, an accurate model effective air-gap length considering actual stator slot structure suitable for any proposed, 6p36s surface-mounted permanent magnet synchronous (SPMSM) accurately verified finite element (FEM). ...

Fractional slot, PMSM motors with a properly designed electromagnetic circuit allow for obtaining high power density factors (more than 4 kW per 1 kg of total motor weight). The selection the number magnetic poles to specific dimensions and operating conditions motor, as well slots selected is subject analysis in this article. This issue extremely important because it affects mass value shaft t...