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S. Mohamed, Y. (2006). SPEED AND PARAMETER IDENTIFICATION FOR SENSORLESS VECTOR CONTROL OF INDUCTION MOTORS AT VERY LOW SPEED. JES. Journal of Engineering Sciences, 34(No 1), 123-143. doi: 10.21608/jesaun.2006.110096
Yehia S. Mohamed. "SPEED AND PARAMETER IDENTIFICATION FOR SENSORLESS VECTOR CONTROL OF INDUCTION MOTORS AT VERY LOW SPEED". JES. Journal of Engineering Sciences, 34, No 1, 2006, 123-143. doi: 10.21608/jesaun.2006.110096
S. Mohamed, Y. (2006). 'SPEED AND PARAMETER IDENTIFICATION FOR SENSORLESS VECTOR CONTROL OF INDUCTION MOTORS AT VERY LOW SPEED', JES. Journal of Engineering Sciences, 34(No 1), pp. 123-143. doi: 10.21608/jesaun.2006.110096
S. Mohamed, Y. SPEED AND PARAMETER IDENTIFICATION FOR SENSORLESS VECTOR CONTROL OF INDUCTION MOTORS AT VERY LOW SPEED. JES. Journal of Engineering Sciences, 2006; 34(No 1): 123-143. doi: 10.21608/jesaun.2006.110096

SPEED AND PARAMETER IDENTIFICATION FOR SENSORLESS VECTOR CONTROL OF INDUCTION MOTORS AT VERY LOW SPEED

Article 8, Volume 34, No 1, January and February 2006, Page 123-143  XML PDF (364.51 K)
Document Type: Research Paper
DOI: 10.21608/jesaun.2006.110096
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Author
Yehia S. Mohamed*
Electrical Engineering Department, Faculty of Engineering, Minia University, Minia, Egypt.
Abstract
A novel sensorless vector controlled induction motor drive system is presented in this paper. In this system, compensation of the drift components of the stator voltage vector is done by offset voltage vector estimation to improve the low-speed drive characteristics. The motor speed is estimated from the difference between the estimated synchronous and slip speed. An effective on-line method for estimating both stator and rotor resistances is introduced in this system to achieve high-precision control at low-speed. The estimation method for rotor resistance is based on the error signal between the command value of reactive power and its actual value being based on stator voltage and current measurements. On the other hand, the error between the magnitude of the stator current command and its measured value is used to estimate the stator resistance variations from its set value. This paper clarifies that the low-speed estimation is possible with stator and rotor resistance estimation and the zero-speed control is achieved under load condition. Simulation results are provided to demonstrate smooth steady-state operation and high dynamic performance of the drive system at very low-speed and at zero-speed.
Main Subjects
Electrical Engineering, Computer Engineering and Electrical power and machines engineering.
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