A novel machine family – dual-rotor, Radial-Flux, Permanent-Magnet (RFPM) machines -has demonstrated that it can substantially improve machine torque density and efficiency. The objective of this paper is to provide a performance comparison between two major alternatives of this technology: Surface-mounted dual-rotor RFPM machines and Axial-Flux Permanent-Magnet (AFPM) machines. The comparison ...

In this paper, a comprehensive parametric analysis for an axial-flux permanent magnet synchronous generator (AFPMSG), designed to operate in a small-scale wind-power applications, is presented, and the condition for maximum efficiency, minimum weight and minimum cost is deduced. Then a Computer-Aided Design (CAD) procedure based on the results of parametric study is proposed. Matching between t...

Subdomain models have been widely used to quickly model the fields and torque of surface-mounted permanent-magnet machines (SMPMMs). Nevertheless, when magnetic saturation occurs, those which assume permeability iron parts be infinite tend inaccurate. More recently, two types developed that take finite into account, but a comparison is still lacking. This article compares subdomain SMPMMs. In s...

The permanent magnet synchronous motors (PMSMs) as the completely symmetrical three-phase machines, which are usually driven by voltage signals. Unfortunately, a PMSM system suffers from different lumped disturbances, such internal parametric perturbations and external load torques, speed regulation problem should be addressed within operation situations. Characterizing current variation of mot...

Surface mounted permanent magnet Vernier (SPM-V) machines, because of their high torque density and multi-pole structure, are promising candidates for low-speed direct-drive applications. To achieve density, the SPM-V machines generally designed with gear ratios. Therefore, operating frequencies can be much higher than those conventional SPM machines. This potentially increases alternating curr...

In many machines, where permanent magnets are used, the effects due to cogging torque generated by permanent magnets (PMs) aggravate the output characteristics of the machines. This paper presents the method for reducing cogging torque in surface-mounted permanent magnet synchronous motor (SPMSM). A new cogging torque suppression method called axial pole pairing is proposed. Compared to convent...