Electric drive subsystem for a low-storage requirement hybridelectric vehicle

Integrating an electric machine drive system into the powertrain of a hybrid electric vehicle (HEV) represents a challenging exercise in packaging complex electromechanical and power electronic subsystems. The Ford combined alternator starter (FCAS) and its attendant power and control electronics are physically partitioned because power electronics has not yet evolved to the stage in which fully packaged drives can be realized. A similar situation exists for the control and sensor subsystems necessary for a fully functional high-performance drive. Hardware partitioning requires that more attention be given to installation issues and to mitigating system interactions. The FCAS system consists of an integrated starter/alternator (S/A), an S/A module (SAM), and a vehicle electrical infrastructure that can support the power and energy levels demanded. Our field experience with the FCAS system is presented along with test results obtained from vehicle operation     

A Direct-Flux-Vector-Controlled Induction Generator With Space-Vector Modulation for Integrated Starter Alternator

A direct-flux-vector-controlled scheme of induction generator has been proposed in this paper for future 42-V automobile application. The fundamental relationship between the rotating speed of the stator flux vector and torque is analyzed. A simple structure with only one proportional-integral (PI) controller is shown to implement the torque and flux controls adequately. By controlling the electromagnetic torque of the induction machine, the required dc-bus voltage can be well regulated within the 42-V PowerNet specifications. Fixed switching frequency and low torque ripple are obtained with space-vector modulation technique. Simulation and experimental results indicate that the proposed scheme provides a practical solution for an integrated starter alternator other than the widely applied field-oriented- control scheme.     

浅谈柴油发电机组发电机部分的保护

对于工作电压小于或等于600V的柴油发电机组,其发电机部分必须具备短路和过我保护措施。但是许多普通的保护设备难以起到满意的效果。文章讨论了北美标准中有关发电机保护的要求,各种保护设备的性能,并推荐一些优化发电机保护的方法。     

Dual-inverter control strategy for high-speed operation of EV induction motors

An integrated starter/alternator (ISA) is normally designed to have high pole structure (10-14 poles) for high starting torque. However, its back electromotive force (EMF) at the peak revolutions per minute should be less than its battery voltage for the power flow control. For example, the back-EMF of a 12-pole ISA should be 42 V at 6000 r/min. These types of conflicting requirements lead to a nonclassical motor design that has extremely large field-weakening range (8:1/spl sim/10:1). In this paper, we are considering the use of an induction machine instead of a permanent synchronous machine. As an idea for solving the voltage limit problem, two inverters are utilized with an objective of sharing the required voltage. The secondary inverter only takes care of the reactive voltage component that grows very fast in high-speed operation. Therefore, an extra voltage source is not required for the secondary inverter. Only a capacitor bank suffices for the secondary inverter.     

High-Temperature Superconducting Homopolar Inductor Alternator for Marine Applications

This paper describes a high power density high-temperature superconducting (HTS) electric machine topology that is scalable for marine propulsion and power generation. The design, currently being pursued for airborne applications, is based on homopolar inductor alternator (HIA) technology, which is new within HTS applications. The basic machine design configuration of the HTS HIA is based on a stationary HTS field excitation coil, a solid rotor, and an advanced but conventional stator comprising liquid-cooled air-gap armature winding and an advanced iron core. High power density is obtained by the enhanced magneto-motive force capability of the HTS coil, the increased airgap flux density and armature current loading, and the high tip velocity of the rotor. Preliminary scaled up designs look attractive for three marine applications: propulsion drive, primary ship power generation, and power generation modules. The generators are driven directly by the turbines without the additional complexity of a clutch and gear system. A conceptual design study of a 36-MW 3600-r/min generator, a 4-MW 7000-r/min auxiliary generator, and a 36-MW 120-r/min and 4-MW 132-r/min propulsion motor are summarized.     

DTFC-SVM motion-sensorless control of a PM-assisted reluctance synchronous machine as starter-alternator for hybrid electric vehicles

Permanent magnet-assisted reluctance synchronous machine (PM-RSM) starter alternator systems are credited with good performance for wide speed range in hybrid electric vehicles. This paper proposes a motion-sensorless motor/generator control of PM-RSM from zero speed up to maximum speed, using direct torque and flux control with space vector modulation. A quasioptimal stator flux reference with a flux versus torque functional is proposed. A stator flux observer in wide speed range uses combined voltage-current models for low speeds, and only the voltage model for medium to high speeds, both in proportional-integral closed loop. A novel rotor speed and position observer with a fusion strategy employs signal injection and only one D-module vector filter in stator reference for low speed, combined with a speed observer from the stator flux vector estimation-for medium-high speed. The proposed system is introduced piece by piece and then implemented on a dSpace 1103 control board with a 350-A metal-oxide-semiconductor field-effect transistor-pulse-width modulation converter connected to a 42-Vdc, 55-Ah battery, and a 140-Nm peak torque PM-RSM. Extensive experimental results from very low speed to high speed, regarding observers and drive responses, including artificial loading (motoring and generating), seem very encouraging for future starter-alternator systems.     

压电贾卡高速响应驱动电路设计与研究

为了适应贾卡经编机机速超过1 500 r/min以上的发展趋势，通过分析经编机对压电贾卡驱动电路驱动贾卡导纱针偏移响应时间的要求，提出了一种高速响应的压电贾卡驱动电路设计方案。对该设计方案中的硬件选址，光电隔离，串入并出和200 V快速开关驱动等主要模块的设计进行详细阐述。在压电贾卡空载状态下的实验测试结果表明，该电路对阶跃信号具有高速的跟踪能力，在频率为35 Hz下，经编机机速为2 100 r/min时能实现快速响应，压电贾卡工作正常。安装在RSJ5/1经编机上进行实际工作测试，结果表明可满足经编机高机速的要求。     

Multiphase Electric Machines for Variable-Speed Applications

Although the concept of variable-speed drives, based on utilization of multiphase machines, dates back to the late 1960s, it was not until the mid- to late 1990s that multiphase drives became serious contenders for various applications. These include electric ship propulsion, locomotive traction, electric and hybrid electric vehicles, ldquomore-electricrdquo aircraft, and high-power industrial applications. As a consequence, there has been a substantial increase in the interest for such drive systems worldwide, resulting in a huge volume of work published during the last ten years. An attempt is made in this paper to provide a brief review of the current state of the art in the area. After addressing the reasons for potential use of multiphase rather than three-phase drives and the available approaches to multiphase machine designs, various control schemes are surveyed. This is followed by a discussion of the multiphase voltage source inverter control. Various possibilities for the use of additional degrees of freedom that exist in multiphase machines are further elaborated. Finally, multiphase machine applications in electric energy generation are addressed.     

Control of switched reluctance drives for electric vehicleapplications

Dynamic controllers of switched reluctance drives adjust at least three variables, i.e., current amplitude, turn-on, and turn-off angles. In electric vehicle (EV) applications high efficiency of the drive over a wide speed range, wide torque bandwidth, and low torque ripple under varying DC-bus voltage conditions are important design goals. Hence, controllers of switched reluctance drives for EVs usually have a complex structure. In this paper, the demands on control accuracy of switched reluctance machine traction drives and the traction controller sampling frequency, which are necessary to take advantage of the switched reluctance machine dynamic capabilities, are discussed. To integrate the traction drive, the control commands need to be actualized with a sampling frequency of at least 100 Hz to meet the high-dynamic requirements of modern vehicle control systems, e.g., active cruise control, antislip control, and active damping of mechanical drivetrain oscillations. It is found that the switching angles have to be adjusted within one-tenth of a mechanical degree. This study shows that switched reluctance drives can fulfill all requirements needed for electric propulsion using standard microcontrollers or digital signal processors     

Development of a linear alternator-engine for hybrid electricvehicle applications

This paper examines the design and operation of a generation system that utilizes a linear crankless internal combustion engine in conjunction with a linear alternator. This system directly utilizes the linear motion of the piston to drive the alternator rather than first converting to rotary motion. The result is a more compact, reliable, and efficient unit as the system has only one moving part, making the system ideal for use in series hybrid electric vehicles. This paper describes the overall system design as well as the subsystems including the engine and alternator. A dynamic simulation is then presented which utilizes the model developed to determine the output characteristics of the system. The prototype system was successfully tested, and experimental results are also included     

x-y addressing methods for iron-garnet display components

The basic principle of iron-garnet light switching arrays for various display applications has recently been published in [1], [2]. This paper discusses in more detail two differentx-yaddressing schemes for high-resolution arrays and outlines the theoretical limits as well as optimization rules for minimum drive power.     

An Ultrahigh-Speed, Low Power Electrical Drive System

New emerging applications in the areas of portable power generation, small turbocompressors and spindles require the development of ultrahigh-speed, low power electrical drives. A 500 000 r/min, 100 W electrical drive system is presented. Because of the ultrahigh-speed requirements, standard machine design and power electronic topology choices no longer apply and the complete drive system has to be considered. A permanent magnet machine with a slotless litz-wire winding is used, which results in a low motor inductance and a high fundamental machine frequency. Three different combinations of power electronic topologies and commutation strategies have been experimentally investigated. A voltage source inverter with block commutation and an additional dc-dc converter is selected as the most optimal choice for the power electronics interface as it results in the lowest volume of the entire drive system due to lower switching losses, no heat sink cooling required, a small number of semiconductor devices, and relatively simple control implementation in a low cost digital signal processor.     

柴油发电机组DSP控制系统人机界面设计

文章采用以ST7920为控制器的点阵式液晶,设计了应用于柴油发电机组控制的人机界面,给出了DSP芯片TMS320F2812与液晶模块的硬件接口电路。软件的编写采用模块化方法,分为驱动层、功能层和应用层三个部分。其中驱动层为面向硬件的底层驱动程序。功能层是以底层驱动为基础编写的中层功能函数,最后通过应用层对功能函数的调用完成了人机界面的菜单设计。     

Using the induction motor as a flux sensor: new control perspectives for zero-speed operation of standard drives

Although sensorless techniques are among the preferred topics of many researchers around the world, the challenge they represent in terms of finding a robust and effective solution for sensor elimination in AC machine drives has not yet been completely solved. This is especially true for induction motor (IM) drives that still remain the "drive choice" for most of the lowand medium-performance applications. This paper discusses how standard control methods of IM drives can be improved by adopting a sensorless flux estimation procedure.     

A resonant MOSFET gate driver with efficient energy recovery

High frequency pulse-width modulation (PWM) converters generally suffer from excessive gate drive loss. This paper presents a resonant gate drive circuit that features efficient energy recovery at both charging and discharging transitions. Following a brief introduction of metal oxide semiconductor field effect transistor (MOSFET) gate drive loss, this paper discusses the gate drive requirements for high frequency PWM applications and common shortcomings of existing resonant gate drive techniques. To overcome the apparent disparity, a new resonant MOSFET gate drive circuit is then presented. The new circuit produces low gate drive loss, fast switching speed, clamped gate voltages, immunity to false trigger and has no limitation on the duty cycle. Experimental results further verify its functionality.     

Transceiver Front-End Technology for Software Radio Implementation of Wideband Satellite Communication Systems

The evolution of satellite communication systems for the design of both the satellite’s communication payload and the ground-station are towards the implementation of such systems using the Software Radio (SR) technology. This paper focuses on a key element of the SR, that is, the wideband front-end which still poses the greatest technological challenge for design and proliferation of SR. In particular, we look at the front-end architecture of wideband receivers, outline the key aspects of the design of such front-end systems, specify the performance metrics associated with their design, present an architecture of a promising wideband analog to digital converter, and finally present the results of our design, implementation, and test campaign of a prototype PC-based SR system. This revised version was published online in July 2006 with corrections to the Cover Date.     

Evaluation of alternative evolutionary programming techniques for optimization of an automotive alternator

One of the primary design requirements of automotive generation systems is maximizing power density subject to the constraint of minimizing the overall system cost. However, with the progress made in the reduction of automotive drive train noise, the torque ripple of the generator has been found to be a dominant noise source under idle conditions at high electrical loads. Thus, an added design constraint is the minimization of the torque ripple produced by the machine. In order to evaluate alternative machine designs (and select an optimal), numerical tools are typically applied. In this research, a focus is placed on the creation of numerical tools that can be used to effectively search for an optimal design. A primary tool is an evolutionary algorithm (EA) that has been integrated within a customized magnetic equivalent circuit (MEC) model of the machine. The selection of an EA that is most likely to converge to an optimal solution in the least amount of time is described along with its use in selecting an optimal rotor-pole geometry.     

Robotics and automation applications of drives and converters

The current design limits of power electronics have a significant effect on robotics and automation applications of drives and converters. This paper treats the major design limits that include dynamic range, reliability of power electronics, precision engineering and reliability, productivity and reliability, and drive motion control standards. For each of these limits, the paper identifies and discusses the salient issues and relates them to promising new technologies and, thus, to the future challenges in power electronic systems     

基于CAN总线的车用爪极交流发电机综合实验平台的研究

文章在介绍CAN现场总线特点的基础上，着重介绍了自行开发的面向车用爪极交流发电机实验测试与控制网络系统的组成与工作原理，并就混合励磁发电机性能测试与控制方法进行了探讨。该系统利用计算机作平台，并采用多传感器的数据融合技术，将方差、模糊理论、专家知识引入车用发电机测试领域，快速有效地建立发电机产品的性能评估与质量保证体系。     

Software Agents in Industry: A Customized Framework in Theory and Praxis

Recently, distributed agents are increasingly adopted in automation control systems, where they are used for monitoring, data collection, fault diagnosis and control. However, existing agent platforms do not always fulfill the requirements of practical automation applications in respect of real-time properties and resource usage. Often, they offer a lot of functionality that is not necessary in automation and leads to significant overhead in respect of design effort and runtime resources. To meet the specific requirements of the automation domain, a resource-efficient agent platform was developed, which relies on established concepts of agent platforms, but modifies and supplements them accordingly. This platform is implemented in Java and in several C++ variants. This paper describes the architecture of the platform and discusses several performance issues. Results of various performance tests are presented in comparison to the established agent platform JADE. Finally, a practical use case is presented, where the platform is utilized to drive a hardware-in-the-loop emulation and testing environment.