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This paper presents two discontinuous pulse width modulation (DPWM) methods for three phase Vienna rectifiers with different performance optimization targets. One for switching loss minimization and one for switching loss reduction with the neutral point voltage controllability. Due to the current commutation characteristics if Vienna rectifiers, the available space voltage vectors are limited. With...
Coupled inductor has been widely adopted in VR applications for many years because of its benefits such as reducing current ripple and improving transient performance. In this presentation, coupled inductor concept is applied to interleaved MHz totem-pole CRM PFC converter with GaN devices. The coupled inductor in CRM PFC converter can reduce switching frequency variation, help achieving ZVS and reduce...
This work presents detailed analysis for the Common Mode Voltage (CMV) in a two stages cascaded gradient driver system. The vector modulation method is proposed to eliminate or reduce the CM voltage in a cascaded system without a neutral or ground point. The method is demonstrated through two stages example but can be extended to topology with more stages in cascaded. Meanwhile, the power stage output...
Hybrid electromagnetic interference (EMI) filters (HEFs) which are composed of an active filter and a passive filter, have been proposed to reduce the size and weight of conventional passive EMI filters. However, accurate models that can be used to predict the stability and performance of HEFs have not been developed. To cope with this, this paper presents a modeling technique for a hybrid common-mode...
This paper presents the analysis of mixed mode noise in an H-bridge PWM converter. Based on the definition of differential mode (DM) and common mode (CM) noise voltage source and noise current and the time domain voltage and current relationship, noise prediction models are proposed in frequency domain for CM, DM and mixed mode (MM) noise with the consideration of system symmetry regarding the noise...
We analyzed the local behaviors of both time and space harmonic magnetic fluxes in this research to improve the efficiency of inverter feeding induction motors. As a result, we clarified that: (1) the magnetic flux of time harmonics passes in parallel through rotor bars, and (2) the magnetic flux of space harmonics passes radially through the rotor bars from the delay side in the direction of rotation...
A simplified analysis of influence of pole pairs on the steady-state behavior of induction motors is presented. The analysis makes simplifying assumptions to express relationship between key steady-state performance parameters of 2-pole reference motor compared to its multiple pole counterparts. The analysis is performed using considerations of fixed geometrical dimensions on one hand and fixed output...
This paper puts forward a concept for measuring rotor eccentricity in an wound rotor induction machines. The analysis is fully developed in the theory section then an experimental rig is described and measurements taken. These are compared to the calculated values. Using pole-specific search windings are necessary in a wound rotor machine because standard sideband current measurement techniques are...
The estimation of electrical losses is a basic requirement for motor design based on efficiency optimization. A utility and accurate electrical loss calculation method for induction motors utilizing 2-D finite element analysis is proposed in this paper. The stator copper losses are directly calculated on the basis of Joule's Law; the rotor copper losses are expressed as the integration of current...
The paper describes an improved method to control a Pseudo Direct Drive (PDD) permanent magnet machine with only one sensor on the low-speed rotor (LSR). Due to the magnetic coupling between the two rotors, the PDD machine exhibits low stiffness and non-linear torque transmission characteristics, and hence, the position of the high-speed rotor (HSR) cannot be determined using simple gearing ratio...
Most of the failures in oil-lubricated journal bearings are associated with mechanical instabilities produced by lubrication system problems or bearing wear, and result in increased shaft vibration. Therefore, monitoring of the journal bearing condition in the field mainly relies on analysis of proximity probe or accelerometer signals. However, not all motors with journal bearings are equipped with...
In this study, we developed an algorithm for the dynamic characteristic analysis of irreversible demagnetization. The conventional static characteristic analysis of irreversible demagnetization considers only d-axis magnetic flux components. However, the accuracy of this method is limited in its analysis of irreversible demagnetization characteristics when the motor is actually rotating. Therefore,...
A simple and accurate AC resistance model is essential for online estimation of copper loss which can be utilized in several ways of controlling and monitoring. This paper presents application of Squared Field Derivative on three-phase IPM machine to model AC resistance of rectangular conductors. It focuses on Finite Element Analysis to validate analytical model. The deviations from analytical model...
A cascaded brushless doubly fed induction machine (CBDFIM) drive with the same active rotor volume and comparable extended constant torque and constant power regions as those of the doubly fed induction machine (DFIM) is proposed and theoretically demonstrated. To achieve the appealing goal, the drive system is configured to supply the power winding with a constant voltage constant frequency (CVCF)...
In this paper, optimal waveforms to control constant instantaneous torque of switched reluctance motors while minimizing copper losses are computed by using the pattern search as an optimization algorithm. Optimal torque sharing using two quadratic and one linear functions is proposed to approximate the optimal torque waveforms accurately. The optimal torque sharing was verified with a 3.75 kW, 3820...
Search algorithms that reduce the time to solve the direct model predictive control (MPC) problem are proposed in this paper. By allowing for suboptimal solutions, the computational complexity of the underlying optimization problem can be significantly reduced, albeit by sacrificing (to a certain degree) optimality. Two approaches are presented and discussed. The first approach requires quadratic...
Current sensor integration in commercial power semiconductor modules is generally based on shunt resistance methods. The resulting losses and lack of galvanic isolation present opportunities for improvement. This paper describes the integration of sub-millimeter sized giant magnetoresistive (GMR) point field detectors (PFDs) into commercial IGBT modules to provide nearly-lossless, galvanically isolated...
This paper investigates the uncontrolled generator (UCG) operating characteristics of permanent magnet (PM) synchronous machine drives using current-source inverters with normally-on switches. This special mode occurs when a PM machine is spinning at a high speed and gating signals are simultaneously removed from all of the inverter switches. This investigation shows that the UCG operating characteristics...
This paper presents a high performance control of interior permanent magnet synchronous motor (IPMSM) incorporating a neuro-fuzzy controller (NFC) coupled with a loss minimization algorithm (LMA). Among numerous LMAs, a loss model based controller (LMC) offers fast response with minimum torque pulsations. Thus, an LMC is developed in this work to optimize the efficiency of the drive while an adaptive...
This paper compares Scalar and Vector control of three phase nonlinear interior permanent magnet synchronous motor (IPMSM) in healthy and under inter turn fault (ITF) state. Finite element method based model of IPMSM is used for simulation, which considers all nonlinearities and magnetic characteristics of the core such as saturation, cross magnetization, core loss, and skin effect. In order to study...
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