New method of Current Measurement in AC Drives to Achieve More Accuracy and Less Dissipation
Siamak Hamzeei1, Yser Noori Shirazi2, Majid Aghababee3, Vahid Riazi4
1S. Hamzeei, Department of Electrical Engineering, Shomal University, Amol, Iran.
2Y. Noori Shirazi, Department of Electrical Engineering, Islamic Azad University Arak Branch, Arak, Iran.
3M. Aghababaee, Department of Electrical & Electronics Engineering, Imam Khomeini Maritime Sciences University, Noshahr, Iran.
4V. Riazi, Department of Electrical Engineering, Shiraz University, Shiraz, Iran.
Manuscript received on October 22, 2014. | Revised Manuscript received on November 03, 2014. | Manuscript published on December 30, 2014. | PP: 16-20 | Volume-4 Issue-2, December 2014. | Retrieval Number: B3561124214/2013©BEIESP
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© The Authors. Blue Eyes Intelligence Engineering and Sciences Publication (BEIESP). This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/)
Abstract: Speed and Voltage sensor-less control requires current measurement that Provides accurate control with low cost, noise and Complexity. Engine current measurement is essential to eliminate torque distortion achieving uniform torque. The most common method of current estimating is inserting sensing resistance in the path of unknown current. This method incurs massive power dissipation in high output current. The resistance depends on temperature changes and tolerance. Using self-tune method is preferred for eliminating bad effect of heat temperature, components tolerance and noise. In this paper, we solve this problem with using filter-based self-tune current measurement. But the sensed current of filter based method is low and can be cut by noise and is not accepted for current control. So we can use combined method to improve SNR.
Keywords: Current measurement, Combined sensing, Filter, Compensation, Calibration.