Influence of Rotor Design on Electromagnetic Performance in Interior Permanent Magnet Machines

Abstract

Nowadays, Interior Permanent Magnet Synchronous Machines (IPMSM) are widely adopted in various sectors such as automotive, railway or public transportation (ebuses, trams, etc.). Among the benefits that these machines present, they offer a number of design degrees of freedom. Furthermore, they can operate over a wide speed range, with a good flux weakening capability. One of the main challenges is to define a complete geometrical parametrization, in order to identify an optimal structure that satisfies the design requirements. In this paper, a detailed analysis of the rotor structure is carried out looking at understanding the effects of the geometrical parameters on key performance indexes (e.g. flux density harmonic content, torque capability, torque ripple, etc.). Based on the preliminary analysis, an optimization procedure is implemented for the design of a Nabla-shaped rotor to satisfy the electromechanical performance of a case study traction motor. The results are showing how an optimal machine can be designed with a reduced amount of permanent magnet, by optimizing the rotor structure.

Synchronous Reluctance Machines: A Comprehensive Review and Technology Comparison

“…As discussed in [46], the q-axis inductance is usually higher compared to an equivalent SPM, therefore generally IPM are more suitable if a wide constant power speed range is desired. Indeed, the constant power in flux-wakening mode of operation is achievable at lower Volt-Amps ratings compared to surface mounted PM machine [47], [48], [49].…”

“…By solving phasor diagram (Fig. 14) the FW capability can be increased if the ratio between q-axis inductance and PM flux follows the relation (8) [49]:…”

A Review on Electromagnetic rotor machines

“…Stator Compared to copper and iron losses, The losses of a rotor in a machine are usually small There will be, but the rotor due to overheating failed. [7]. Flux Magnetic by explaining the number of tubes Circuit analysis, to improve flux linkages Integration at different stages of the machine techniques, of a double-rotor configuration Characteristics are provided.…”