In the high speed range, vector control of rotor flux orientation of an induction machine implements good perfornance. However, the perfornance in low speed rang deteriorates because of the inaccurate estimation of ro...
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ISBN:
(纸本)9623675445
In the high speed range, vector control of rotor flux orientation of an induction machine implements good perfornance. However, the perfornance in low speed rang deteriorates because of the inaccurate estimation of rotor flux and speed. In this paper, modified voltage model for rotor flux estimation and neuron model-reference adaptive system (MARS) for speed estimation are used to improve the perfornance of speed sensorless vector control. To improve the accuracy of rotor flux estimation, the stator resistance is identified on-line. The experimental results show that the proposed scheme yields improved perfornance in low speed range.
It is a new testing technology that ice thickness is measured by making use of electric conductivity in water and in ice. The electric conductivity in water gradually decrease from strong to weak during the state of w...
详细信息
ISBN:
(纸本)9806560612
It is a new testing technology that ice thickness is measured by making use of electric conductivity in water and in ice. The electric conductivity in water gradually decrease from strong to weak during the state of water changing from liquid into solid. Bases on this characteristics, a new sensor structure for measuring thickness of ice layer and its testing method are developed in the paper, and its application to hydrologic gauging is also briefly introduced.
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