Indirect field oriented control of an induction motor implemented with an artifical neural network

Bibliography: p. 146-15

Control of BLDC Motor in Presence of Static Rotor Eccentricity

BLDC motors are one of the motor types rapidly gaining popularity. In recent years various researches have been done in the field of motor fault detection and fault tolerant control. However, in the case of rotor problems, especially rotor eccentricity tolerant control a few papers have been presented. Since in sensitive industries, continuous operation with good performance till the maintenance time is very important, operating in the desired condition in presence of this kind of fault is really advantageous. But conventional control methods in presence of eccentricity fault are inefficient. Because they generate phase currents with the same amplitudes and equality of currents and inequality of back-EMFs and phase inductance changes due to eccentricity, leads to intensive torque ripples. So, a new control strategy which can improve motor performance is desirable. In this paper an on-line control method based on Back-EMF estimation is proposed which can increase quality of operation by eliminating load torque pulsation considering rotor eccentricity

Fixed Current Angle Operation Strategy in Low-Speed Sensorless Drive for Improved Torque Capability over Critical Point

This paper proposes a fixed current angle operation strategy in low-speed sensorless drive for improved torque capability of IPMSM. The operating principle of the proposed method and the effect of the critical point on the operating point would be analyzed. Based on the analysis, desirable location of the critical point for the proposed strategy to be effective is discussed. The proposed strategy has a simple control structure and can determine the d-q current references from an one-dimensional table without any additional LUTs for compensation. Analyses and experimental results verify that the actual current traces the MTPA trajectory less than 5 degrees of error bound and that torque capability has been improved from 1.75 p.u. to 2.4 p.u. by the proposed sensorless control method.N