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Zeszyły Problemowe - Maszyny Elektryczne Nr 86/2010

control strategies offer good dynamie response of the motor below base speed. although constant d-axis cur-rent coinponent strateg}' is numerically less complex and appears to be better solution for applications with Iow speed and high dynamie demand.

Mariusz Korkosz, Politechnika Rzeszowska, Rzeszów Adrian Młot, Politechnika Opolska, Opole

OGRANICZANIE PULSACJI MOMENTU ELEKTROMAGNETYCZEGO W BEZSZCZOTKOWYM SILNIKU PRĄDU STAŁEGO O SKOŚNYCH MAGNESACH

TORQUE RIPPLE REDUCTION BY USING MULTI-SLICE FE MODELLING OF BRUSHLESS DC MOTOR WITH SKEWED MAGNETS

Abstract: The intention of this paper is to look at inulti-slice two-dimensional finite element modeling of a brushless DC motor w ith and without magnet skew. The results obtained are compared with experimental measurements on a typical machinę without skew structure of the magnet. A standard approach to reducing cogging torąue is to skew the magnet structure with respect to the rotor. Altematively. the stator core can be skewed as well. This paper will consider the case of magnet skew only. From the finite element analysis (FEA) results. it shows that the bnishless DC motor with 10° magnet skew^r angle with 5 slices had better performance tlian the motor with different values of skew angle. Additionally the difference betwecn a physical machinę with un-skewed magnets and a model of skewed magnet machinę are show-n.

Grzegorz Badowski, Jerzy Hickiewicz, Krystyna Macek-Kamińska, Marcin Kamiński Politechnika Opolska, Opole

Wojciech Herman, PGE Elektrownia Opole SA, Brzezie

POŚREDNI POMIAR ELEKTROMAGNETYCZNEGO MOMENTU SILNIKA INDUKCYJNEGO

INDIRECT MEASUREMENT OF ELECTROMEGNETIC INDUCTION MOTOR TORQUE

Abstract: The principle assign of slow variable induction motor torque based on power measurement taken by motor was briefly presented in the paper. Sample wavefonns of motor load torque received of based on regis-tered waveform input power were shown. It seems that in case of high-pow er driver, which continuously reg-istration electrical quantity such as power or current input is currently often applying. registration of slow vari-able load torque can be comfortable to assessment of motor work.

Maria Dems, Krzysztof Komęza, Jacek Szulakowski Politechnika Łódzka, Łódź

STRATY PODSTAWOWE I DODATKOWE W RDZENIU WYSOKOOBROTOWYCH SILNIKÓW INDUKCYJNYCH MAŁEJ MOCY

BASIC AND ADDITIONAL CORE LOSSES OF THE HIGH-SPEED SMALL SIZE INDUCTION MOTORS