Design Optimization of Asymmetric Salient Permanent Magnet Synchronous Machines

Abstract

This work sets forth a design paradigm for a permanent-magnet synchronous machine (PMSM) architecture that employs rotational asymmetry to obtain an improved constant power speed range performance and increased torque density. A population-based multi-objective optimization design approach is used to design the new machine topology and compare it to a conventional symmetrical surface mounted PMSM. Results obtained demonstrate that improved performance is attainable with the asymmetrical design. Validation of the results is carried out by means of three dimensional finite element analyses.

Multi-Objective Optimization Design of Fractional Slot Concentrated Winding Permanent Magnet Synchronous Machines

“…Parameters s t , r t , c t and m t are integers used to establish a mapping between the stator, rotor, conductor and magnet materials, respectively, and a database that contains the properties of different steel, conductor and permanent magnet materials [11], [12]. Parameter n sp is an integer which maps into a pair of prechosen S s and P combinations.…”

“…Applied constraints are listed in Table 2 along with a brief description. Further information on all constraints can be found in [11], [12] and [18].…”

“…Electric machine optimization design techniques have been applied in [7]- [12]. For instance in [8], a multi-objective optimization design of a surface mounted PMSM actuator for aero-space application was considered.…”

“…The method is based on the work done in [11], where therein a rigorous multi-objective optimization problem was presented for an integer-slot distributed-winding (ISDW) SM-PMSM. The presented work, compared to aforementioned papers, has the advantage of being computationally efficient, based on analytical modelling, and thus with comparable accuracy to FEA methods [11], [12]. In addition, it allows incorporating a huge design space (22 parameters or more), which increases the probability of reaching a more optimum solution, and easily allows studying the effect of simultaneously changing the values of these parameters on the overall performance of the machine.…”

PM-Assisted Synchronous Reluctance Machine Flux Weakening Control for EV and HEV Applications

“…P ERMANENT Magnet Synchronous Machines (PMSMs) have been traditionally considered as appropriate candidates for Electric Vehicle (EV) and, specially, for Hybrid Electric Vehicle (HEV) applications, due to their high power density and high efficiency [1]. However, these technologies require high density magnetic materials to produce the rotor flux, usually sintered neodymium-iron-boron (NdFeB) alloys, and other rare-earth materials, such as dysprosium (Dy), leading to high price, risk of depletion and resource monopoly issues [2], [3].…”