高出力 應用을 위한 永久磁石 移入形 同期 릴럭턴스 電動機의 特性解析
Characteristic analysis of permanent magnet assisted synchronous reluctance motor for high power application
고출력응용 영구자석 릴럭턴스전동기 전기공학;
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The performance of a synchronous reluctance motor(SynRM) in terms of torque and power factor depends on the d and q-axis inductances L_(d) and L_(q) of the machine. The large difference(L_(d)-L_(q)) and ratio(L_(d)/L_(q)) of two inductances are good for the machine's properties. Therefore, considerable attention has been paid in the past to improve rotor design of SynRM. The torque density and power factor of SynRM can be greatly increased by adding a proper quantity of permanent magnet. It is called permanent magnet assisted synchronous reluctance motor(PMASynRM). However, when a proper quantity of permanent magnet is chosen to counteract the quadrature magneto motive force, rotor ribs must be saturated by means of an additional magnet quantity. The effects of saturation and iron losses are often important issues in the performance of PMASynRM. The saturation effect in the d-axis of the rotor is very different from that of the q-axis because the nature of the magnetic paths is different. In the case of d-axis excitation, the saturation is the combined effect of saturation in the stator yoke, stator teeth, and rotor ribs, and can reduce the L_(d) inductance by as much as 50%. Finite element method has the ability to model the complicated internal structure within a PMASynRM and to model magnetic saturation to a high degree of accuracy. In this paper, finite element analysis for a PMASynRM is presented and the characteristic analysis of inductance and torque is performed under the effect of saturation. Comparisons are given with inductance and torque characteristics of normal SynRM and those according to quantity of residual flux density (0.1T to 0.4T) in PMASynRM, respectively. The focus of this paper is characteristic analysis of d and q-axis inductances and torque according to magnetizing quantity of interior permanent magnet for PMASynRM. TMS320C31 DSP installed experimental devices and test machines are equipped and performance characteristics according to load are investigated. The d and q-axis current component ratios, load angles of a PMASynRM are investigated quantitatively on the basis of the proposed analysis method and the experimental test. Comparisons are given with output characteristic curves of normal SynRM and those according to the load in PMASynRM, respectively. And it is confirmed that the proposed model results in high output power performance.