Active Flux Concept for Motion-Sensorless Unified AC Drives

被引:368
作者
Boldea, Ion [1 ]
Paicu, Mihaela Codruta [1 ]
Andreescu, Gheorghe-Daniel [2 ]
机构
[1] Univ Politehn Timisoara, Dept Elect Engn, Timisoara 300223, Romania
[2] Univ Politehn Timisoara, Dept Automat & Appl Informat, Timisoara 300223, Romania
关键词
AC motor drives; active flux; estimation; magnetic anisotropy; sensorless control; variable speed drives;
D O I
10.1109/TPEL.2008.2002394
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 [电气工程]; 0809 [电子科学与技术];
摘要
Rotor and stator flux orientations are now standard concepts in vector and direct torque control of ac drives. The salient-pole rotor machines, where magnetic saturation plays a key role, still pose notable problems in flux, rotor position and speed estimations for motion-sensorless control, especially in the low-speed range (below 30 rpm in general), leading to numerous dedicated state observers. This letter introduces a rather novel (or generalization) concept-active flux or torque-producing flux-and its utilization in all ac drives by employing a unified state observer for motion-sensorless control in a wide speed range. The active-flux concept turns all salient-pole traveling field machines into nonsalient-pole ones. The active-flux vector is aligned to the rotor d axis for all synchronous machines and to the rotor-flux vector axis for induction machines. This way, the rotor position and speed observer seems more amenable to a wide speed range, with smaller dynamic errors. This observer, based on the active-flux concept, is pretty much the same for all ac drives. An example of implementation for an interior permanent-magnet synchronous motor with weak permanent magnets and large magnetic saliency that compares very favorably with respect to most signal injection methods, down to 1 rpm and up to 4000 rpm, is provided through digital simulations. Experiments are under way.
引用
收藏
页码:2612 / 2618
页数:7
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