Conceptual design of sleeve rotor synchronous reluctance motor for traction applications. Issue 5 (1st May 2016)

• Record Type: Journal Article
• Authors: Reddy, Patel Bhageerath; Grace, Kevin; El‐Refaie, Ayman
• Is Part Of: IET electric power applications. Volume 10:Issue 5(2016)
• Page Start: 368
• Page End: 374
• Publication Date: 2016-05-01
• Subjects: rotors -- reluctance motors -- traction motors -- demagnetisation -- permanent magnet machines; sleeve rotor synchronous reluctance motor -- traction application -- synchronous reluctance machine -- high speed traction motor design -- SynRel machine -- rare‐earth material -- demagnetisation -- uncontrolled generation mode -- permanent magnet machine -- rotor mechanical retention -- power density -- rotor loss -- torque ripple; Electric power -- Periodicals; Electric power systems -- Periodicals; 621.305
• DOI: 10.1049/iet-epa.2015.0266
• Languages: English
• ISSNs: 1751-8660

Abstract

Abstract : Synchronous reluctance machines are very appealing for high speed traction motor design due to their robustness, simple structure, absence of magnets, and simple control. The absence of magnets means that synchronous reluctance (SynRel) machines are not susceptible to price variability and sustainability of rare‐earth materials. Moreover, there are no concerns about demagnetisation or uncontrolled generation mode. However, the challenge of achieving a good constant power to speed ratio is dependent on the mechanical aspects of the design. Conventional SynRel designs perform poorly compared with the permanent magnet machines due to the presence of bridges and/or centre posts in absence of the magnets to help saturate these regions. In this case, the challenge of rotor mechanical retention is addressed with the help of a sleeve on the rotor to reduce the need for bridges and/or centre posts. Design optimisation including the mechanical aspects of the sleeve is presented in this study. The final design with a sleeve will be shown to be superior to a conventional design in terms of power density, rotor losses, saliency and torque ripple.