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Power Electronics in Transportation, 1998

Date 22-23 Oct. 1998

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Displaying Results 1 - 16 of 16
  • Power Electronics in Transportation (Cat. No.98TH8349)

    Publication Year: 1998
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    Freely Available from IEEE
  • Author index

    Publication Year: 1998 , Page(s): 0_9
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    Freely Available from IEEE
  • Comparative analysis of torque-controlled IM drives with applications in electric and hybrid vehicles

    Publication Year: 1998 , Page(s): 3 - 10
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    This paper presents torque-controlled drives based on machine flux and torque estimation. The theoretical aspects of these methods are discussed and a comparative analysis is provided with emphasis on DSP implementation and experimental results. The problems in the application of these techniques to propulsion systems are also discussed and possible solutions are presented View full abstract»

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  • Power electronics for propulsion and energy charging of electric vehicles by high slip linear induction machines

    Publication Year: 1998 , Page(s): 37 - 42
    Cited by:  Papers (1)  |  Patents (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (408 KB)  

    The paper presents some possible arrangements of electronic converters oriented to the on board regulation of batteries' charge in small vehicles motorised by linear induction machines. The convenience is shown of adopting an on board wound secondary translator and a long stator motor with the aim of traction and contact-less charging system, during the steering operations. Furthermore, the modification of translator current by proper electronic converters allows a speed regulation too according the mechanical characteristic of thrust in different conditions of batteries' charge. For the different analysed arrangements the mechanical characteristics are compared and discussed in order to obtain suitable suggestions for the choice of traction drive View full abstract»

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  • EMI experimental comparison of PWM inverters between hard- and soft-switching techniques

    Publication Year: 1998 , Page(s): 71 - 77
    Cited by:  Papers (15)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (624 KB)  

    Electromagnetic interference (EMI) is a major concern for inverter driven motor drives. The sources of EMI have been commonly identified as coming from high switching dv/dt and di/dt rates interacting with inverter parasitic components. The reduction of parasitic components relies on highly integrated circuit layout and packaging. On the other hand, switching dv/dt and di/dt can be potentially reduced by soft-switching techniques. In this paper, the EMI sources of a hard-switching SPWM inverter are identified and measured with separation of common-mode and differential-mode noises. The noise reduction by an auxiliary resonant snubber inverter is presented. The test condition and circuit layout is described as the basis of the study. Finally, the experimental EMI spectra of both hard- and soft-switching inverters is compared View full abstract»

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  • Soft-switched MCT/IGBT inverter for motor drive applications

    Publication Year: 1998 , Page(s): 53 - 62
    Cited by:  Papers (1)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (800 KB)  

    The use of MCTs in a soft switched PWM inverter application is presented. The MCTs are power devices that are capable of handling high di/dt and high dv/dt. Their weak point is high turn-off switching losses. A topology of the MCT/IGBT inverter is proposed. To minimize the switching losses, the devices are soft switched on at zero voltage switch (ZVS) conditions and turned off at zero current switch (ZCS) conditions. An auxiliary resonant commutated pole (ABCP) inverter is presented and analyzed for soft switching of MCT/IGBT modules of a PWM inverter for motor drive applications. A novel ARCP control technique is presented that is based on pre-calculated gating times. It reduces the cost of the ARCP controller with no need for high speed sensing devices View full abstract»

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  • Multilevel inverters for electric vehicle applications

    Publication Year: 1998 , Page(s): 79 - 84
    Cited by:  Papers (29)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (488 KB)  

    This paper presents multilevel inverters as an application for all-electric vehicle (EV) and hybrid-electric vehicle (HEV) motor drives. Diode-clamped inverters and cascaded H-bridge inverters: (1) can generate near-sinusoidal voltages with only fundamental frequency switching; (2) have almost no electromagnetic interference (EMI) and common-mode voltage; and (3) make an EV more accessible/safer and open wiring possible for most of an EV's power system. This paper explores the benefits and discusses control schemes of the cascade inverter for use as an EV motor drive or a parallel HEV drive and the diode-clamped inverter as a series HEV motor drive. Analytical, simulated, and experimental results show the superiority of these multilevel inverters for this new niche View full abstract»

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  • Bi-directional DC to DC converters for fuel cell systems

    Publication Year: 1998 , Page(s): 47 - 51
    Cited by:  Papers (90)  |  Patents (6)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (344 KB)  

    This paper first describes the need of a bi-directional DC to DC converter for a fuel cell system. Various combinations of current-fed and voltage-fed converters are explored for the application of different voltage levels. With a preliminary study, putting current-fed on low-voltage side and voltage fed on high voltage side indicated higher efficiency than the other way around. Two low-side circuit topologies were then selected for hardware implementation. One is the L-type half-bridge current-fed converter, and the other is full-bridge current-fed converter. The high-side circuit topology is fixed with a full-bridge voltage-fed converter. Two systems were built and tested to full power. The results indicate that the combination with the full-bridge converter on the low-voltage side is more efficient than the combination with the L-type half-bridge converter on the low-voltage side for both charging and discharging modes View full abstract»

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  • Efficiency and cost-effectiveness of AC drives for electric vehicles improved by a novel, boost DC-DC conversion structure

    Publication Year: 1998 , Page(s): 11 - 19
    Cited by:  Papers (18)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (924 KB)  

    On the basis of a comparative approach, the design analysis of 3φVSI is reviewed, pointing-out the drawbacks of battery voltage variations on IGBT and capacitor bank sizing. Boost converters would compensate for such drawbacks, however a comparative analysis justifies why the common single-leg boost is to be avoided and how two-phase or H-Bridge converters can do the job, outlining design properties of multiphase conversion structures. A novel inductive coupling reactor is presented to improve further the design of boost-supplied AC drive, showing possible overall benefits by comparative analysis. These are confirmed by prototype realization. Particular concern is dedicated to loss measurements techniques, due to the very high efficiency of the prototype converter View full abstract»

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  • A sensorless direct torque control technique for permanent magnet synchronous motors

    Publication Year: 1998 , Page(s): 21 - 28
    Cited by:  Papers (4)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (372 KB)  

    A novel sensorless direct torque control scheme for permanent magnet synchronous motor (PMSM) is presented. The rotor position and actual torque is estimated based on the stator flux estimation. The error between the estimated and command torque controls the stator flux and voltage vector to obtain the desired torque. Computer simulation and experimental results are presented to substantiate the proposed scheme View full abstract»

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  • Prime mover for hybrid electric propulsion system

    Publication Year: 1998 , Page(s): 109 - 116
    Cited by:  Patents (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (920 KB)  

    One of the current trends in power electronics in transportation is towards a mechatronically-controlled, hybrid electric, drive-by-wire, all-wheel driveable propulsion system, incorporating a prime mover called the Fijalkowski engine-a novel reciprocating, five-stroke cycle, twin-opposed-piston, internal combustion engine with a `two-in-one' silent drive-shaft generator/motor-a macroelectronically-commutated, magnetoelectrically-excited, brushless AC-DC/DC-AC macrocommutator composite-flydisc-rotor generator/motor, and six or eight steerable, motorized and/or generatorized wheels with the macroelectronically-commutated, magnetoelectrically excited, brushless DC-AC/AC-DC macrocommutator wheel-hub motors/generators with much higher performance and greater compactness not only at the interconnection stage View full abstract»

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  • Evaluation of advanced automotive electrical system architectures using MAESTrO

    Publication Year: 1998 , Page(s): 85 - 92
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (744 KB)  

    The capabilities of the present 12-V point-to-point electrical system architecture are being changed by the electrical load and fuel efficiency requirements of the next-generation of automobiles. Furthermore, with the advent of electric and hybrid vehicles, there is a greater next to develop low-cost architectures which reduce the weight, increase the efficiency and improve the reliability of the electrical system. Although a large number of alternative architectures have previously been suggested, they have not been evaluated rigorously. Hence, it is not clear what concept or combination of concepts will allow the system to meet its performance objectives at minimum cost. This paper uses the software tool MAESTrO to design advanced electrical system architectures and identify those that have superior performance and are economically competitive View full abstract»

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  • Effect of switching frequency of soft switched inverter on electric vehicle system

    Publication Year: 1998 , Page(s): 63 - 69
    Cited by:  Papers (3)
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    The electric vehicle (EV) induction motor has smaller resistance and inductance than the general induction motor in order to meet the load requirement of the EV driving system. To improve the quality of the motor phase currents, the switching frequency must be increased which will lower the ripple current into the induction motor. This makes the inverter conduction losses and motor losses decrease, and the DC link capacitance smaller. On the other hand, it makes the inverter switching losses increase. However, increased switching loss can be minimized by soft-switching topologies. This paper shows the effects of the switching frequency and soft-switching topologies on the overall efficiency of the specified EV system with simulation results View full abstract»

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  • Soft commutated direct current motor

    Publication Year: 1998 , Page(s): 95 - 102
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    A novel soft commutated direct current (DC) motor is introduced. The current of the commutated coil is intentionally drained before the brush disconnects the coil. This prevents the spark generation that normally occurs in conventional DC motors. A similar principle can be applied for DC generators View full abstract»

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  • Device evaluation and filter design for 20 kW inverter for hybrid electric vehicle applications

    Publication Year: 1998 , Page(s): 29 - 36
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (592 KB)  

    In inverter design for electric vehicle applications there are several major requirements that should be met. The inverter should be able to operate bidirectionally with reasonably high efficiency under a high ambient temperature. Therefore it is critical to select the suitable main switches for the inverter. In this paper seven types of devices (including 3 dual IGBTs, 1 intelligent dual IGBT, 2 six-packed intelligent IGBTs and 1 intelligent dual MCT) have been evaluated with respect to efficiency and thermal management, under hard switching, ZVS and ZCS operating conditions. An input inverter EMI filter has been proposed and possible filter inverter interaction is being discussed. Favorable working frequencies for the devices under different conditions are given View full abstract»

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  • Influence of motor drive parameters on the robust stability of electric power steering systems

    Publication Year: 1998 , Page(s): 103 - 108
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (372 KB)  

    This paper investigates the robust stability of an electric power steering system. The stability analysis is carried out by using an eighth order model of the vehicle and steering system dynamics. The general case where the vehicle becomes unstable at high speed and under wet road conditions is examined. In this situation, the characteristic equation of the linearized vehicle model has roots in the right-half complex plane. The vehicle is stabilized by the use of yaw and lateral acceleration state feedback to the electric power steering assist mechanism. It is shown that the vehicle is robustly stabilized for large variations in the vehicle dynamics and motor drive parameters View full abstract»

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