Abstract
This paper investigates the optimal design method of switched reluctance machines (SRMs) for mitigating torque ripple and improving average torque under the low speed operation. In order to produce high torque for hill climbing or overload start-up of micro electric vehicles (EVs) and reduce the converter capacity, an SRM with four times torque overload capability and two times speed range with constant power is needed. To improve the SRM performance, first, a new method called multiphase excitation (MPE) method for calculating resultant static torque is adopted, which takes the cross-coupling and magnetic saturation into consideration to reduce the calculation error bought by the traditional method called single-phase excitation (SPE) method; second, optimal methods, including parameters sensitivity analysis, multi-objective optimization function, and winding connection types, have been taken to release the magnetic saturation, to improve average torque, and to depress torque ripple. Compared with the initial scheme, the torque ripple is minimized from 55.33% to 14.84% and the average torque is improved by 8.36%. The experimental results validate the effectiveness of the proposed methods.
Highlights
Permanent magnet synchronous motors (PMSMs) are widely used in electric vehicles (EVs) and hybrid electric vehicles (HEVs) for its high torque density, high power density and high efficiency [1]–[3]
The PMSMs with rareearth materials such as Neodymium and Dysprosium are high in cost and there is a concern about the irreversible demagnetization of permanent magnet under high temperature [4], [5]
OF THE multiphase excitation (MPE) METHOD AND THE single-phase excitation (SPE) METHOD When the Switched reluctance machines (SRMs) operating at low speed with severe saturation, the back electromotive force (EMF) is low and the current can be regarded as the chopping current in the conduction interval
Summary
When the SRMs operating at low speed with severe saturation, the back electromotive force (EMF) is low and the current can be regarded as the chopping current in the conduction interval. Multi-objective and multi-variable functions which combine the average torque and the torque ripple by weighted factors are adopt to obtain the optimal solutions. These two are the most insensitive parameters. We can observed that the partial saturation in stator yoke has been relieved
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
