Comparative analysis of rotor losses in high-speed permanent magnet machines with different winding configurations considering the influence of the inverter PWM

Abstract

. (2015). Comparative analysis of rotor losses in high-speed permanent magnet machines with different winding configurations considering the influence of the inverter PWM. In Proceedings of the 10th IEEE International Conference on Ecological Vehicles and Renewable Energies (EVER 2015), March 31 -April 2, 2015. Piscataway: Institute of Electrical and Electronics Engineers (IEEE). General rightsCopyright and moral rights for the publications made accessible in the public portal are retained by the authors and/or other copyright owners and it is a condition of accessing publications that users recognise and abide by the legal requirements associated with these rights.• Users may download and print one copy of any publication from the public portal for the purpose of private study or research.• You may not further distribute the material or use it for any profit-making activity or commercial gain • You may freely distribute the URL identifying the publication in the public portal ? Take down policyIf you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim. Abstract-Due to development in fields of materials and power electronics, use of high-speed electrical machines has boosted significantly in recent decades. They are widely used in number of applications, such as electrically assisted turbochargers, flywheel energy storage systems, spindle applications, turbo molecular pumps, micro gas turbines. In applications where high efficiency and high power density are required, the most suitable machine type for high-speed operations is a permanent magnet (PM) machine. In this paper the performance of several different topologies of high-speed PM machines required for use in a micro-gas turbine application are evaluated. Different winding topologies, retaining sleeve materials and magnetization patterns are considered, where the main criterion for the machine performance are eddy current losses in the rotor. Influence of time harmonics in stator currents caused by the inverter Pulse Width Modulation (PWM) is incorporated in the calculation.

Electrical and Mechanical Characteristics of a High-Speed Motor for Electric Turbochargers in Relation to Eccentricity

“…The number of slots should be determined with consideration of factors such as cogging torque, winding configuration, winding factor, the number of turns, power density, radial force, mechanical structure, and manufacturing cost. The latter should be based on whether a given winding can be produced using automation or if manual labor is required [24].…”

Analysis and Design of Novel High Speed Permanent Magnet Machine Considering Magnet Eddy Current Loss

“…To suppress the eddy current loss of rotor, different machine models were proposed. A possible solution to this problem is the optimization of winding, which is the most important factor for these machines because a suitable winding configuration can minimize the spatial harmonics of the armature field (AF) efficiently [13]- [15]. Rotor shape optimization is the best choice to diminish the eddy current loss and cogging torque while increasing the power density and efficiency of the machine; however, these approaches have a disadvantage of a low winding factor; consequently, a high copper loss occurs for the same output torque [16].…”

Magnet Eddy Current Loss Reduction in Permanent Magnet Machines

“…In terms of spatial harmonics reduction, many different methods are proposed in the last decades. Winding optimization is one of the most effective ways since a proper winding design can reduce the MMF harmonics of armature field effectively [10]- [13]. However, this method might lead to low winding factor so that the copper loss will be increased to obtain the same output torque.…”