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Robust Operation of Double-Output AC Machine Drive
Y. Wang,T.A. Lipo,D. Pan 전력전자학회 2011 ICPE(ISPE)논문집 Vol.2011 No.5
This paper presents strategies for maintaining operation of a double-output AC machine drive in the presence of various component failures. With a short/open-switch fault, the drive is capable of operating the AC machine at a reduced power capability by creating an artificial neutral. The procedures of mode transition are shown to depend on the system configuration. This operating method can be applied to both induction and permanent magnet synchronous machines as long as they can sustain a few cycles of increased current. Robust operation of the drive in case of short-circuit fault in the phase winding is also presented. It is also demonstrated in this paper the operating method when one of the two isolated DC sources is interrupted. This work further discusses the two-phase operation mode in which one faulted phase is isolated from the remaining portion of the circuit. Simulink simulation results are presented.
Design and Analysis of a Novel Grid-Connected to Rotor Type Doubly Fed Induction Machine
Yong-Min You,Lipo, T. A.,Byung-Il Kwon IEEE 2012 IEEE transactions on magnetics Vol.48 No.2
<P>This paper proposes a novel grid-connected to rotor type doubly fed induction machine (DFIM) in which the rotor winding is connected to the grid instead of the stator winding. The size and weight of the stator can be reduced on the proposed grid-connected to rotor type DFIM, because the proposed type can use the rotor core more efficiently compared to a conventional grid-connected to stator type DFIM. In order to verify the size and weight reduction of the proposed type, the loading distribution method (LDM) is utilized. As a design result, the outer diameter and weight of the stator on the proposed type have been decreased. Equivalent circuit analysis and finite element analysis (FEA) were performed to verify the design results and to analyze the characteristics of the novel DFIM. Finally, these analysis results are confirmed by experimental results.</P>
Modeling of Novel Permanent Magnet Pole Shape SPM Motor for Reducing Torque Pulsation
Shah, S. Q. A.,Lipo, T. A.,Byung-Il Kwon IEEE 2012 IEEE transactions on magnetics Vol.48 No.11
<P>This paper deals with the modeling of a novel permanent magnet (PM) pole shape for a surface-mounted permanent magnet (SPM) motor so as to generate sinusoidal back EMF and linear electromagnetic torque. Conventional SPM motors have a square-shaped PM pole structure; therefore, square back EMF is generated along with the torque pulsations. This novel SPM motor has sinusoidal PM pole shape in the axial direction; therefore, sinusoidal back EMF is generated due to the sinusoidal magnetic flux distribution. Sinusoidal back EMF eliminates most of the cogging torque; thus, a linear electromagnetic torque is generated. Square and sinusoidal current excitation is provided as to analyze the electromagnetic torque characteristics of SPM motor models. As compared to square current excitation, sinusoidal current excitation shows better linearity as well as average electromagnetic torque for the novel SPM motor model. 3-D finite element analysis (FEA) is utilized to analyze and compare the back EMF, cogging torque, and electromagnetic torque of conventional and proposed novel PM pole shaped SPM motor models for both square and sinusoidal current excitation.</P>
Yong-Min You,Lipo, T. A.,Byung-Il Kwon IEEE 2012 IEEE transactions on magnetics Vol.48 No.11
<P>This paper performs a shape optimization of a grid-connected-to-the-rotor type doubly fed induction generator (DFIG) in which the rotor winding is connected to the grid instead of the stator winding. To analyze the characteristics of a DFIG accurately, a time step 2D-FEA is carried out, which is coupled with Simplorer. To maximize the torque per weight as well as to maintain the efficiency, the Kriging model based on latin hypercube sampling and genetic algorithm are utilized. As an optimal design result, the torque per weight on the optimal model has been increased. Finally, the analysis and the optimal design results are confirmed by the experimental results.</P>
A Novel Two-Phase Permanent Magnet Synchronous Motor Modeling for Torque Ripple Minimization
Fei Zhao,Lipo, T. A.,Byung-Il Kwon IEEE 2013 IEEE transactions on magnetics Vol.49 No.5
<P>This paper proposes a novel two-phase, two-pole, permanent magnet synchronous motor (PMSM) with dual U-core stator structure for torque ripple minimization. The proposed motor is modeled based on the conventional single-phase U-core PMSM with approximate output power and core dimension. Torque ripple in the novel motor can be reduced significantly due to 90 <SUP>°</SUP> electrical angle phase shift in two sets of magnet pairs and 90<SUP>°</SUP> shift in two-phase excitation currents. Characteristics of both PMSMs such as back-EMF, cogging torque and electromagnetic torque are analyzed and compared by using the 3-D finite element analysis (FEA). As shown in the result, the cogging torque and torque ripple in the novel two-phase PMSM are efficiently reduced with sinusoidal back-EMF waveform and reasonable current density value. The validity of both PMSM models is also verified by the comparison between simulated and experimental measured results.</P>
Performance Improvement of Dual-Half-Controlled-Converter and Its Applications in Utility Rectifiers
Y. Wang,D. Panda,T. A. Lipo,D. Pan 전력전자학회 2011 ICPE(ISPE)논문집 Vol.2011 No.5
This paper presents improved control techniques for the three-phase three-wire dual-half-controller-converter (DHCC) using an interleaved pulse-width-modulation (PWM) technique. Compared with the hysteresis controller presented in earlier literatures, the proposed PWM controllers require smaller filtering elements and/or a lower sampling frequency. While the same number of active switches are used compared to a conventional voltage-source-converter (VSC), the current rating for each device in DHCC is significantly lower. The proposed system is free of shoot through and it provides system redundancy. Both simulations and experimental results are presented.