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Papers by mohammad rahman

Research paper thumbnail of A direct torque-controlled interior permanent-magnet synchronous motor drive without a speed sensor

IEEE Transactions on Energy Conversion, 2003

Research paper thumbnail of Analysis of current controllers for voltage-source inverter

IEEE Transactions on Industrial Electronics, 1997

Current-controlled pulsewidth modulated (PWM) inverters are widely used in high-performance AC dr... more Current-controlled pulsewidth modulated (PWM) inverters are widely used in high-performance AC drives because they give high dynamic responses in such systems. This paper presents a comparative study of several current controllers. Particular attention is paid to the hysteresis controller and the ramp-comparator controller, due to their simplicity and widespread use. An improved ramp comparator is proposed in which the current error signals are compared to three 120° phase-shifted triangular waveforms. This eliminates the zero voltage vector applied to the inverter and reduces the inherent amplitude and phase errors. Computer simulations are used to compare the performances. Fast Fourier transform technique is used to show the power spectrum of the current waveforms. Experimental results validate the simulated performances

Research paper thumbnail of Fuzzy Logic Based Speed Control of an IPM Synchronous Motor Drive

Journal of Advanced Computational Intelligence and Intelligent Informatics, 2000

Abstract: This paper presents the fuzzy logic based speed control of an interior permanent synchr... more Abstract: This paper presents the fuzzy logic based speed control of an interior permanent synchronous motor (IPMSM) drive. The fundamentals of fuzzy logic algorithms related to motor control applications are illustrated. A new fuzzy speed controller for the IPMSM drive is designed. The ...

Research paper thumbnail of Performances of fuzzy-logic-based indirect vector control for induction motor drive

IEEE Transactions on Industry Applications, 2002

Research paper thumbnail of Nonlinear control of interior permanent-magnet synchronous motor

IEEE Transactions on Industry Applications, 2003

Research paper thumbnail of An analysis of bearingless AC motors

IEEE Transactions on Energy Conversion, 1994

Page 1. IEEE Transactions on Energy Conversion, Vol. 9, No. 1, March 1994 61 A.Chiba Member, IEEE... more Page 1. IEEE Transactions on Energy Conversion, Vol. 9, No. 1, March 1994 61 A.Chiba Member, IEEE Dept. of EE Faculty of Sci.& Tech. Science Univ. of Tokyo 2641 Yamazaki, Noda, Chiba, Japan, 278 Tel. + 81(471)24 - 1501 Fax. + 81(471)24 - 2150 AN ANALYSIS OF ...

Research paper thumbnail of Design and analysis of permanent magnet-type bearingless motors

IEEE Transactions on Industrial Electronics, 1996

Abstract-Magnetic bearings have been applied to high speed and high power electric machines for m... more Abstract-Magnetic bearings have been applied to high speed and high power electric machines for machine tools, turbomolec-ular pumps, etc. Bearingless motors can be expected to realize high speed and high power ratings because magnetic bearing functions are integrated ...

Research paper thumbnail of A direct torque-controlled interior permanent-magnet synchronous motor drive without a speed sensor

IEEE Transactions on Energy Conversion, 2003

Research paper thumbnail of Analysis of current controllers for voltage-source inverter

IEEE Transactions on Industrial Electronics, 1997

Current-controlled pulsewidth modulated (PWM) inverters are widely used in high-performance AC dr... more Current-controlled pulsewidth modulated (PWM) inverters are widely used in high-performance AC drives because they give high dynamic responses in such systems. This paper presents a comparative study of several current controllers. Particular attention is paid to the hysteresis controller and the ramp-comparator controller, due to their simplicity and widespread use. An improved ramp comparator is proposed in which the current error signals are compared to three 120° phase-shifted triangular waveforms. This eliminates the zero voltage vector applied to the inverter and reduces the inherent amplitude and phase errors. Computer simulations are used to compare the performances. Fast Fourier transform technique is used to show the power spectrum of the current waveforms. Experimental results validate the simulated performances

Research paper thumbnail of Fuzzy Logic Based Speed Control of an IPM Synchronous Motor Drive

Journal of Advanced Computational Intelligence and Intelligent Informatics, 2000

Abstract: This paper presents the fuzzy logic based speed control of an interior permanent synchr... more Abstract: This paper presents the fuzzy logic based speed control of an interior permanent synchronous motor (IPMSM) drive. The fundamentals of fuzzy logic algorithms related to motor control applications are illustrated. A new fuzzy speed controller for the IPMSM drive is designed. The ...

Research paper thumbnail of Performances of fuzzy-logic-based indirect vector control for induction motor drive

IEEE Transactions on Industry Applications, 2002

Research paper thumbnail of Nonlinear control of interior permanent-magnet synchronous motor

IEEE Transactions on Industry Applications, 2003

Research paper thumbnail of An analysis of bearingless AC motors

IEEE Transactions on Energy Conversion, 1994

Page 1. IEEE Transactions on Energy Conversion, Vol. 9, No. 1, March 1994 61 A.Chiba Member, IEEE... more Page 1. IEEE Transactions on Energy Conversion, Vol. 9, No. 1, March 1994 61 A.Chiba Member, IEEE Dept. of EE Faculty of Sci.& Tech. Science Univ. of Tokyo 2641 Yamazaki, Noda, Chiba, Japan, 278 Tel. + 81(471)24 - 1501 Fax. + 81(471)24 - 2150 AN ANALYSIS OF ...

Research paper thumbnail of Design and analysis of permanent magnet-type bearingless motors

IEEE Transactions on Industrial Electronics, 1996

Abstract-Magnetic bearings have been applied to high speed and high power electric machines for m... more Abstract-Magnetic bearings have been applied to high speed and high power electric machines for machine tools, turbomolec-ular pumps, etc. Bearingless motors can be expected to realize high speed and high power ratings because magnetic bearing functions are integrated ...

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