Application of a multiobjective minimization technique for reducing the torque ripple in permanent-magnet motors

Journal Article · Wed Sep 01 04:00:00 EDT 1999 · IEEE Transactions on Magnetics (Institute of Electrical and Electronics Engineers)

DOI:https://doi.org/10.1109/20.799073· OSTI ID:20000593

Borghi, C A; Casadei, D; Cristofolini, A; Fabbri, M; Serra, G

The demand for high performance permanent-magnet (PM) motors is continuously increasing in industrial applications because of their high efficiency and power density. The main design parameters of a permanent-magnet motor, which reduce the total torque ripple, are determined. A two-step design procedure is utilized. First the geometry of the permanent-magnet rotor is derived by a one-dimensional field analysis coupled to a multiobjective minimization technique. The objective function of the minimization is defined as a combination of the electromotive force harmonic components induced in the stator and of the harmonic components of the air-gap magnet permeance. As a second step, a two-dimensional numerical model, solved through a finite element method, is adopted to further improve the analysis of the magnetic field. This allows the optimization of the magnet arc width and the minimization of the cogging torque. The method described has been used for the design of a three-phase, six-pole, permanent-magnet synchronous motor. Experimental tests have been carried out to verify the results obtained by the design procedure.

• Research Organization: Univ. of Bologna (IT)
• OSTI ID: 20000593
• Journal Information: IEEE Transactions on Magnetics (Institute of Electrical and Electronics Engineers), Journal Name: IEEE Transactions on Magnetics (Institute of Electrical and Electronics Engineers) Journal Issue: 5Pt3 Vol. 35; ISSN IEMGAQ; ISSN 0018-9464
• Country of Publication: United States
• Language: English

Related Subjects

32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
ALGORITHMS
COMPUTER-AIDED DESIGN
DESIGN
ELECTRIC MOTORS
FINITE ELEMENT METHOD
INDUSTRIAL PLANTS
PERFORMANCE
PERMANENT MAGNETS
TORQUE