Abstract
This paper introduces the pole ratio adjustment technique to improve the torque characteristics of the doubly salient permanent magnetic machine (DSPM). The electrical characteristics of the machine, namely the magnetic field distribution, flux linkage, back-electromotive force (EMF), and cogging torque, were obtained under open-circuit conditions. The electromagnetic torque and ripple torque were examined under the loaded condition. The simulations, based on the 2D-finite element method, show that the optimal pole ratio for the DSPM structure is with 18 stator teeth and 15 rotor poles. This optimal structure achieves a larger phase back-EMF than the conventional structure, as well as had a better magnetic flux path with a reasonable cogging torque. The on-load test also confirmes that the proposed optimal structure can produce a significantly higher electromagnetic torque than the conventional machine while maintaining a satisfactory torque ripple. Furthermore, an experimental prototype of the DSPM structure having 18/15 stator/rotor poles was fabricated and tested to verify the simulations. The experimental results were in good agreement with the simulations. The design technique and the fabricated prototype demonstrate the DSPM utilization for low-speed/high torque applications.
Highlights
Permanent magnet (PM) machines have been extensively researched due mainly to their outstanding merits, such as no excitation loss, low copper loss, high reliability, high electromotive force (EMF) and torque density (Chau et al, 2008; Ibrahim et al, 2015; Okedu et al, 2021)
The doubly salient PM machine (DSPM) structure contains the PMs mounted in the stator yoke, windings installed on the salient stator poles, while its Permanent Magnet Machine Torque Improvement rotor is a salient pole with no windings or brushes
We proposedly improve the performance of DSPM by using the pole ratio adjustment technique
Summary
Permanent magnet (PM) machines have been extensively researched due mainly to their outstanding merits, such as no excitation loss, low copper loss, high reliability, high electromotive force (EMF) and torque density (Chau et al, 2008; Ibrahim et al, 2015; Okedu et al, 2021). Stator-PM machine is one of the popular type of PM machines, it contains the installed PMs in the stator part (Cheng et al, 2011). It is obviously shown that the DSPM receives much research attention and is suitable for several low-speed applications. The DSPM structure contains the PMs mounted in the stator yoke, windings installed on the salient stator poles, while its Permanent Magnet Machine Torque Improvement rotor is a salient pole with no windings or brushes. Based on the configuration of DSPM, this machine indicates low inertia and light rotor weight; it is suitable for low-speed operation (Cheng et al, 2001a; Cheng et al, 2001b). Many previous studies have attempted to develop the DSPM aiming to be used for electric vehicle applications as well as electrical generation from renewable energy which is a clean energy source (Fan et al, 2006; Boonluk et al, 2020; Srithapon et al, 2020; Boonluk et al, 2021; Okedu and Barghash, 2021; Srithapon et al, 2021)
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