開關式磁阻馬達自軸承控制

磁阻馬達經由凸極的激磁可產生一吸引力，而此吸引力可分為切線方向與徑向的力量，切線方向的力量即為轉矩，而徑向力量會因為馬達結構而互相抵銷，在這種特殊的狀態下三相12/8磁阻馬達可經由選擇不同的激磁極來同時產生徑向力與轉矩，也就是說在可以分別激磁各極電流的情形下同時控制徑向力與轉矩，使轉子在沒有軸承的情形下控制在氣隙的中央。本論文針對12/8極磁阻馬達提出一套自軸承控制系統，即轉子僅需要單邊軸承並限制軸向移動，而徑向位置則利用徑向力控制使轉子穩定於中央，本文除了分析馬達轉矩與徑向力、建立其數學模式，並提出一自軸承控制法則，最後將控制法則以DSP控制器實現並以實驗驗證之。

關鍵字

12/8SRM ；徑向力控制；自軸承

並列摘要

Switched reluctance motors develop torque through an attraction force between the stator poles and the rotor teeth. This attraction force can be divided into tangential and radial force components. The tangential force converts to the rotational torque, and the net radial force is generally zero due to the geometrically balanced motor structure. Due to its special structure, the shaft radial force and torque of a three-phase 12/8 switched reluctance motor can be separately controlled by proper selection of pole currents. Therefore, when all the pole currents can be controlled independently, it is possible to control the radial force to counterbalance the external force acting on the shaft. Consequently, the rotor can be controlled to a position near the center of the air gap when it does not have a rotational bearing. In this paper, a control scheme for self-bearing of a 12/8 pole SRM drive is proposed. The rotor needs only one bearing for rotation and to constrain the axial movement. The other end can move freely in radial direction but is balanced with the radial force produced by the motor. Motor torque and radial force characteristics is analyzed and modeled, the self-bearing control scheme is developed and presented. The proposed control scheme is also implemented with a DSP and verified experimentally.

並列關鍵字

12/8SRM ； Radial force control ； self-bearing

參考文獻

[1] T.J.E. Miller, Switched Reluctance Motors and Their Drives, Oxford, 1993.

[2] D.E. Cameron, J.H. Lang, and S.D. Umans, “The origin and reduction of acoustic noise in doubly salient variable-reluctance motors”, IEEE Trans. on Industry Applications, vol. 28, no. 6, Nov./Dec. 1992, pp. 1250-1255.

[3] N. Sadowski, Y. Lefevre, C.G.C. Neves, and R. Carlson, “ Finite elements coupled to electrical circuit equations in the simulation of switched reluctance drives: attention to mechanical behaviour”, IEEE Trans. on Magnetics, vol. 32, no. 3, May 1996, pp. 1086-1089.

[4] B. Fahimi, G. Suresh, and M. Ehsani, “Design considerations of switched reluctance motors: vibration and control issues”, Conference Record of the 1999 IEEE-IAS, vol. 4, 1999, pp. 2259-2266.

[5] B. Fahimi and M. Ehsani, “Spatial distribution of acoustic noise caused by radial vibration in switched reluctance motors”, Conference Record of the 2000 IEEE-IAS, vol. 1, 2000, pp. 114-118.

國際替代計量

開關式磁阻馬達自軸承控制

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