Induced pole rotor structure for line start permanent magnet synchronous motors

• Published in: IET electric power applications Vol. 8; no. 4; pp. 131 - 140
• Main Authors: Ugale, Rajaram Tukaram, Chaudhari, Bhalchandra Nemichand, Baka, Srinivas, Dambhare, Sanjay Shamrao, Pramanik, Ashutosh
• Format: Journal Article
• Language: English
• Published: London The Institution of Engineering and Technology 01.04.2014; Institution of Engineering and Technology; The Institution of Engineering & Technology
• Subjects: A.c. Machines; Applied sciences; brushless dc motors; circumferentially magnetised magnets; Direct current; Electrical engineering. Electrical power engineering; Electrical machines; Electromagnets; Exact sciences and technology; finite element analysis; heteropolar performances; induced pole rotor structure; induction motors; inverter driven motors; Inverters; invertors; line start permanent magnet synchronous motors; magnet conflguration; Miscellaneous; permanent magnet motors; Permanent magnets; Poles; Power electronics, power supplies; Prototypes; radially magnetised magnets; rotor conflguration; Rotors; spoke magnet rotor LSPMSM; spoke magnets; Spokes; standard induction motor; Synchronous motors; time‐stepping flnite element methods; Various equipment and components; rotors; line start permanent magnet synchronous motors; induction motors; inverter driven motors; standard induction motor; induced pole rotor structure; finite element analysis; synchronous motors; heteropolar performances; invertors; brushless dc motors; spoke magnets; rotor conflguration; time-stepping flnite element methods; spoke magnet rotor LSPMSM; circumferentially magnetised magnets; magnet conflguration; permanent magnet motors; radially magnetised magnets; Performance evaluation; Inverter; Prototype; Benchmarking; Permanent magnet motors; Asynchronous motor; Rotor; Steady state; Standards; Synchronous motor; Finite element method; Direct current magnet; Ac motor; Time domain method; Brushless machine; Electric motor; Permanent magnet; Comparative study
• ISSN: 1751-8660; 1751-8679; 1751-8679
• DOI: 10.1049/iet-epa.2013.0223

This study presents a rotor structure, for a line start permanent magnet synchronous motors (LSPMSMs), which can be applied to other types of inverter driven motors, such as brushless dc and permanent magnet synchronous motors. In this development, the magnet configuration is a combination of both circumferentially (spoke) as well as radially magnetised (embedded) magnets which are so arranged that induced poles are generated in alternate positions in the heteropolar structure, thereby reducing the quantity of permanent magnets in the rotor. Both the transient as well as steady-state performances of the machine have been analysed by using time-stepping finite element method. For experimental demonstration a prototype which uses spoke magnets (P1), plus two prototypes (P2 and P3) of the proposed magnet arrangement have been built. The former (P1) is used for benchmarking the performance of the proposed configuration. Results have indicated that the rotor configuration reported here (P2) with reduced magnet volume gives better performance than the spoke magnet rotor LSPMSM. Also, the performances of prototype LSPMSMs are compared with that of the standard induction motor of the same frame size and physical dimensions.