2009 IEEE International Electric Machines and Drives Conference 2009
DOI: 10.1109/iemdc.2009.5075176
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A new technique of cogging torque suppression in direct-drive permanent magnet brushless machines

Abstract: In direct-drive electric propulsion systems, where there is no reduction gear to minimize and absorb the adverse effects due to cogging torque generated by the permanent magnet (PM) machine, minimization of cogging torque generation is of particular importance. In this paper, a novel axial pole pairing method is proposed to minimize cogging torque generation in a special three-phase outer-rotor PM brushless machine, which uses uneven stator poles to enhance back electromotive force (EMF). Analytical formulas o… Show more

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Cited by 22 publications
(19 citation statements)
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“…The cogging torque needs to be minimized since it is often considered to be one of the origins of noise and vibration. Various cogging reduction techniques have been introduced in many literatures including tooth width design, teeth paring, notching, PM shape design [38], axial pole pairing [39], non-uniformly distributed teeth [40], pole shifting [41], and so forth [42]. It seems that the skewing is the most common and effective in many cases.…”
Section: Cogging Torquementioning
confidence: 99%
“…The cogging torque needs to be minimized since it is often considered to be one of the origins of noise and vibration. Various cogging reduction techniques have been introduced in many literatures including tooth width design, teeth paring, notching, PM shape design [38], axial pole pairing [39], non-uniformly distributed teeth [40], pole shifting [41], and so forth [42]. It seems that the skewing is the most common and effective in many cases.…”
Section: Cogging Torquementioning
confidence: 99%
“…Cogging torque is a distorting periodic torque generated by the tendency of the rotor magnetic field to be aligned with the stator poles [23], [24]. These torque oscillations produce vibrations and additional noise and are present even if no torque production is commanded (i.e., without currents circulating through the stator).…”
Section: Introductionmentioning
confidence: 99%
“…A great amount of scientific literature regarding cogging torque minimization can be found, which can be broadly divided into two approaches: (i) the ones focused on altering the physical machine design [24], [28]- [34] and (ii) the ones based on pre-commissioning processes to evaluate the cogging torque for further compensation [27], [35], [36]. Inconveniences exist in both approaches, being the most relevant the unavoidable actions to be taken before the manufacturing for the first approaches and the accurate pre-commissioning process, with the compulsory use of high resolution resolvers or encoders at some point, for the second ones.…”
Section: Introductionmentioning
confidence: 99%
“…The reduction of the cogging toque is especially important in direct-drive propulsion systems where there is no gear to minimize or absorb the cogging torque. Its minimization can be achieved through stator teeth pairing, optimal magnet pole-arc and stepped rotor skewing [6]. The proper design of the magnets plays a significant role in a good motor design in terms of the cogging torque minimization.…”
Section: Introductionmentioning
confidence: 99%