Optimal Pole Number and Winding Designs for Low Speed–High Torque Synchronous Reluctance Machines

Abstract

This paper studies the feasibility of using synchronous reluctance machines (SynRM) for low speed-high torque applications. The challenge lies in obtaining low torque ripple values, high power factor, and, especially, high torque density values, comparable to those of permanent magnet synchronous machines (PMSMs), but without resorting to use permanent magnets. A design and calculation procedure based on multistatic finite element analysis is developed and experimentally validated via a 200 Nm, 160 rpm prototype SynRM. After that, machine designs with different rotor pole and stator slot number combinations are studied, together with different winding types: integral-slot distributed-windings (ISDW), fractional-slot distributed-windings (FSDW) and fractional-slot concentrated-windings (FSCW). Some design criteria for low-speed SynRM are drawn from the results of the study. Finally, a performance comparison between a PMSM and a SynRM is performed for the same application and the conclusions of the study are summarized.

Performance Improvement of Existing Three Phase Synchronous Reluctance Machine: Stator Upgrading to 5-Phase With Combined Star-Pentagon Winding

“…The rotor of the reference SynRM was optimized with its stator in [22] to obtain an improved performance. A rotor with 4-poles is selected as it has been proved in [24] that a 4-poles rotor shows a better performance. Consequently, 20, 40 and 60 slots are the possible number of slots of the 5-phase stator which achieve the constrains of (2) and Table I.…”

“…However, unfortunately, a simple and balanced 5phase winding might not be possible from the existing 3phase stator. This is because, most of the existing 3-phase stators were manufactured to give an integer number of slots per pole per phase with 3-phase winding (18,24,36 or 48slots and 2, 4 or 6-poles) [15]. Consequently, a fractional number of slots per pole per phase will be obtained when applying a 5-phase winding to these stators.…”

Admixed recurrent Gegenbauer polynomials neural network with mended particle swarm optimization control system for synchronous reluctance motor driving continuously variable transmission system

“…By use of some optimal design methods, 1,2 the synchronous reluctance motors (SynRMs) have high power factor, high efficiency and low torque ripple compared with the induction motors (IMs). The SynRMs have been diffusely applied in the moving fluids and the textile industry, such as water well pumps and fiber spinning machines.…”

Comparison of Dual-Permanent-Magnet-Excited Machines and Surface-Mounted Permanent Magnet Machines in Terms of Force

“…Low-speed permanent magnet (PM) machines have attracted increasing attention in several fields, such as wind power generation, electric vehicles, electric vessels, home appliances, etc. [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15]. They can offer so-called direct-drive operation, which is beneficial for avoiding disturbances caused by a gearbox [7].…”