The efficiency improvement of capacitor motor with ferrite magnetic wedges

Kaga, Akio; Anazawa, Yoshihisa; Akagami, Hideo

doi:10.1109/tmag.1986.1064633

Cited by 19 publications

(2 citation statements)

References 2 publications

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“…Ferrite slot wedges can decrease the cogging torque due to the reduction in the imbalance of the magnetic resistance between the slots and the stator teeth. However, these wedges do have drawbacks in terms of the vibration and frangibility [2]. Recently, soft magnetic composite (SMC) slot wedges have been studied.…”

Section: Introductionmentioning

confidence: 99%

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A Novel Skewed-Type Iron Slot Wedge for Permanent Magnet Synchronous Generators for Improving Output Power and Reducing Cogging Torque

Kang¹,

Moon²,

You³

et al. 2015

Journal of Electrical Engineering and Technology

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-This paper proposes a novel skewed-type iron slot wedge that can improve both the cogging torque and the output power of a permanent magnet synchronous generator (PMSG). Generally the open slot structure is adopted in a PMSG due to its convenient winding work, but the high cogging torque is undesired. Firstly, an iron slot wedge was utilized to reduce the cogging torque of an open slot type PMSG. However, the output power of the machine decreased rapidly with this method. Thus, a proposed skewed type iron slot wedge is presented to improve the output power as well as the cogging torque as compared to the open slot type. Shape optimization of the skewed-type iron slot wedge is performed to simultaneously maximize the output power and reduce the cogging torque. The Kriging model based on the Halton sequence method and a genetic algorithm are used to optimize the design.

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Section: Introductionmentioning

confidence: 99%

“…Table 1 gives the specifications of an open-slot-type PMSG. Ferrite and SMC have been widely used for conventional slot wedges [2]. However, ferrite is vulnerable to vibrations and is limited in terms of the possible shape designs.…”

Section: Introductionmentioning

confidence: 99%

A Novel Skewed-Type Iron Slot Wedge for Permanent Magnet Synchronous Generators for Improving Output Power and Reducing Cogging Torque

Kang¹,

Moon²,

You³

et al. 2015

Journal of Electrical Engineering and Technology

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Reduction of higher harmonic sequences in terminal voltage of an AC exciting synchronous generator using magnetically anisotropic slot wedges

Ide

Watanabe

Sato

et al. 1995

Electrical Engineering Japan

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This paper describes relationships between characteristics of a magnetically anisotropic slot wedge and voltage higher harmonics in an ac exciting synchronous generator terminal due to permeance ripple caused by an open‐slot‐type rotor. From the relationships obtained, practical guidelines were formulated for machine designs applying the magnetically anisotropic slot wedge. The results are as follows. (1) Equivalent permeability of the magnetically anisotropic slot wedge became isotropic wedge permeability for air‐gap flux ripple. (2) Two ways were identified to reduce voltage‐higher harmonics by using the slot wedges. (3) The level of leakage flux passing through the anisotropic slot wedge was determined only by its permeability in the width direction. (4) Effectiveness of the magnetic anisotropic slot wedges inserted into the stator slots was verified from experimental results using a model machine of the open‐ slot‐type rotor.

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Performance optimization design and analysis of bearingless induction motor with different magnetic slot wedges

Cheng

Sun

et al. 2019

Results in Physics

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The efficiency improvement of capacitor motor with ferrite magnetic wedges

Cited by 19 publications

References 2 publications

A Novel Skewed-Type Iron Slot Wedge for Permanent Magnet Synchronous Generators for Improving Output Power and Reducing Cogging Torque

A Novel Skewed-Type Iron Slot Wedge for Permanent Magnet Synchronous Generators for Improving Output Power and Reducing Cogging Torque

Reduction of higher harmonic sequences in terminal voltage of an AC exciting synchronous generator using magnetically anisotropic slot wedges

Performance optimization design and analysis of bearingless induction motor with different magnetic slot wedges

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