Shape optimization of closed slot type permanent magnet motors for cogging torque reduction using evolution strategy

Journal Article · Sat Mar 01 00:00:00 EST 1997 · IEEE Transactions on Magnetics

DOI:https://doi.org/10.1109/20.582663· OSTI ID:462666

Chun, J S; Jung, H K ^[1]; Yoon, J S ^[2]

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1. Seoul National Univ. (Korea, Republic of). School of Electrical Engineering
2. LG Industrial Systems Co., Ltd., Anyang, Kyongki (Korea, Republic of)

Permanent magnet motors have been used in a wide variety of industrial applications. For the improvement of servo performances in the permanent magnet motors, a closed slot is adopted in the stator and a rare-earth magnet is used in the rotor. Here, the analysis of a permanent magnet type AC servo motor with both a closed slot and a ring shape magnet is performed by using the finite element method (FEM). The saturation of the bridge part connecting two slot teeth is considered for a nonlinear analysis. The optimal design of the stator is presented for minimizing cogging torque. The torques, i.e., cogging and rated torques are expressed in terms of vector potential computed by directly applying the Maxwell Stress Tensor formula. The minimization of cogging torque of sample model is achieved by using the (1+1) Evolution Strategy (ES) and the rated torque must be more than the specific value.

• Sponsoring Organization: USDOE
• OSTI ID: 462666
• Report Number(s): CONF-960725-; ISSN 0018-9464; TRN: IM9719%%136
• Journal Information: IEEE Transactions on Magnetics, Vol. 33, Issue 2Pt2; Conference: 1996 Summer meeting of the IEEE Power Engineering Society, Denver, CO (United States), 28 Jul - 1 Aug 1996; Other Information: PBD: Mar 1997
• Country of Publication: United States
• Language: English

Related Subjects

32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
INDUSTRIAL PLANTS
ELECTRIC MOTORS
PERMANENT MAGNETS
FINITE ELEMENT METHOD
PERFORMANCE
SERVOMECHANISMS
DESIGN
MAGNETIC FIELDS
STATORS