Alternator - Explore the Science & Experts | ideXlab

Scan Science and Technology

Contact Leading Edge Experts & Companies

Alternator

The Experts below are selected from a list of 267 Experts worldwide ranked by ideXlab platform

David J. Perreault – 1st expert on this subject based on the ideXlab platform

  • Design and Evaluation of a 42-V Automotive Alternator With Integrated Switched-Mode Rectifier
    IEEE Transactions on Energy Conversion, 2010
    Co-Authors: Sai Chun Tang, Thomas A. Keim, David M. Otten, David J. Perreault

    Abstract:

    This paper presents techniques for the design of high-power Lundell Alternators with integrated switched-mode rectifiers. A multisection stator winding and interleaved rectifier arrangement is introduced that enables high power levels to be achieved using small semiconductor devices, and which greatly reduces the output filter capacitor requirements. We also demonstrate control methods suited for this interleaved system. In addition to accurate closed-loop output voltage control, we introduce methods to provide (partial) synchronous rectification for reduced loss, and to provide tight load-dump transient control. The proposed technology is validated in the design and experimental evaluation of a 42-V, 3.4-kW Alternator with fully integrated power electronics and controls. The prototype Alternator achieves approximately a factor of 2.1 increase in power and 1.6 increase in power density as compared to a conventional diode-rectified Alternator.

  • Thermal modeling of Lundell Alternators
    IEEE Transactions on Energy Conversion, 2005
    Co-Authors: Sai Chun Tang, Thomas A. Keim, David J. Perreault

    Abstract:

    Thermal analysis of Lundell Alternators used in automobiles is presented. An analytical thermal model for Lundell Alternators is proposed, and procedures for acquiring the model parameters are elucidated. Based on the thermal model, the temperature profile of an operating Lundell Alternator can be predicted analytically. The predicted Alternator temperatures are found to be consistent with the experimental measurement. The presented models and measurement methods are useful for embedding switched-mode power electronics into the Alternator with low manufacturing cost.

  • automotive power generation and control
    IEEE Transactions on Power Electronics, 2004
    Co-Authors: David J. Perreault, V. Caliskan

    Abstract:

    This paper describes some new developments in the application of power electronics to automotive power generation and control. A new load-matching technique is introduced that uses a simple switched-mode rectifier to achieve dramatic increases in peak and average power output from a conventional Lundell Alternator, along with substantial improvements in efficiency. Experimental results demonstrate these capability improvements. Additional performance and functionality improvements of particular value for high-voltage (e.g., 42 V) Alternators are also demonstrated. Tight load-dump transient suppression can be achieved using this new architecture. It is also shown that the Alternator system can be used to implement jump charging (the charging of the high-voltage system battery from a low-voltage source). Dual-output extensions of the technique (e.g., 42/14 V) are also introduced. The new technology preserves the simplicity and low cost of conventional Alternator designs, and can be implemented within the existing manufacturing infrastructure.

Caiyong Ye – 2nd expert on this subject based on the ideXlab platform

  • Study of a Novel High-Speed Compensated Pulsed Alternator With Multistage Stator Cores
    IEEE Transactions on Plasma Science, 2019
    Co-Authors: Jiangtao Yang, Caiyong Ye, Xin Liang, Fei Xiong

    Abstract:

    The compensated pulsed Alternators (CPAs) have good applications in high-energy lasers, electromagnetic rail guns, and other electromagnetic launch devices. Among various electrical machine topologies, homopolar inductor Alternators (HIAs) have attracted interest as CPAs due to their merits of simple and reliable structure, brushless excitation, and high-speed operation. However, the length of the conventional HIA is difficult to expand because it is limited by the rotor diameter, and the rotor diameter is restricted by the maximum speed of rotor tip, which results in low-energy storage capacity of a single machine. Besides, HIA suffers from the relatively low-power density due to its unipolar air-gap flux density (UAFD). To solve these problems, two novel HIAs with multistage stator cores (HIA-MSCs) are proposed in this paper. One is HIA with UAFD (HIA-UAFD) and the other is HIA with unipolar and bipolar air-gap flux density (HIA-UBAFD). First, the structure and operation principle of HIA-MSCs are illustrated. Then, the key parameters of HIA-MSCs are derived, and the corresponding models are built. Finally, the electromagnetic performances of HIA-MSCs are investigated by 3-D finite-element analysis method. Compared with HIA-UAFD, HIA-UBAFD has relatively higher discharge current and output power, which indicates that HIA-UBAFD is a better candidate for the pulsed Alternator.

  • Design and Research of a High-Speed and High-Frequency Pulsed Alternator
    IEEE Transactions on Plasma Science, 2017
    Co-Authors: Caiyong Ye, Jiangtao Yang, Xin Liang, Wei Xu

    Abstract:

    Pulsed Alternators have the merits of high energy and power densities, which are applied to a wide range of applications, such as the electromagnetic launch, the pulsed laser, and the pulsed high magnetic field. A new type of high-speed and high-frequency pulsed Alternator integrating an Alternator and a motor, is proposed in this paper. A solid rotor which is made of high-strength alloy steel with high yield strength is used in the pulsed Alternator, so it can work at a high tip speed. This machine consists of two Alternators and a motor which share one rotor and one field winding. According to different voltage levels and operation frequencies, the motor and the Alternators with different stack lengths and pole-pairs are designed, respectively. Therefore, it has the abilities of being driven by low-frequency current and discharging high-frequency pulses. In this paper, the basic structure and fundamental of the pulsed Alternator are introduced, the specific parameters of the prototype are given, and the performances are verified by the simulation. The results show that the machine proposed in this paper is suitable for the applications that require high-frequency pulsed discharge.

  • Optimized Design and Simulation of an Air-Core Pulsed Alternator
    IEEE Transactions on Plasma Science, 2015
    Co-Authors: Caiyong Ye, Kexun Yu, Hua Zhang, Lei Tang

    Abstract:

    The air-core pulsed Alternator has been studied for more than three decades. However, its optimized design theories are still rarely reported. The performance of the air-core pulsed Alternator-based pulsed-power system is often closely associated with the electrical machine parameters, the system structure, and the load requirements. The parametric optimization of this type of Alternator has a very important influence on the performance. This paper focuses on the optimization theory of the air-core pulsed Alternator design, including the optimization of the magnetic field distribution, the turn number of armature winding, and the turn number of field winding. The features of the magnetic field distribution in the air-core pulsed Alternators are analyzed based on the analytical expressions. By designing a ferromagnetic shield put on the outside of the stator, the radial magnetic field component increases and the circumferential one decreases. The optimization principles of the winding turn numbers are also deduced based on the system circuit and operation mode. The optimization theories are verified by system-level dynamic simulation. Finally, some rules are summarized, which are beneficial to the optimized design of the air-core pulsed Alternator.

V. Caliskan – 3rd expert on this subject based on the ideXlab platform

  • automotive power generation and control
    IEEE Transactions on Power Electronics, 2004
    Co-Authors: David J. Perreault, V. Caliskan

    Abstract:

    This paper describes some new developments in the application of power electronics to automotive power generation and control. A new load-matching technique is introduced that uses a simple switched-mode rectifier to achieve dramatic increases in peak and average power output from a conventional Lundell Alternator, along with substantial improvements in efficiency. Experimental results demonstrate these capability improvements. Additional performance and functionality improvements of particular value for high-voltage (e.g., 42 V) Alternators are also demonstrated. Tight load-dump transient suppression can be achieved using this new architecture. It is also shown that the Alternator system can be used to implement jump charging (the charging of the high-voltage system battery from a low-voltage source). Dual-output extensions of the technique (e.g., 42/14 V) are also introduced. The new technology preserves the simplicity and low cost of conventional Alternator designs, and can be implemented within the existing manufacturing infrastructure.

  • A New Design for Automotive Alternators
    , 2000
    Co-Authors: David J. Perreault, V. Caliskan

    Abstract:

    This paper introduces a new design for Alternator systems that provides dramatic increases in peak and average power output from a conventional Lundell Alternator, along with substantial improvements in efficiency. Experimental results demonstrate these capability improvements. Additional performance and functionality improvements of particular value for highvoltage (e.g., 42 V) Alternators are also demonstrated. Tight load-dump transient suppression can be achieved using this new design and the Alternator system can be used to implement jump charging (the charging of the high-voltage system battery from a low-voltage source). Dual-output extensions of the technique (e.g., 42/14 V) are also introduced. The new technology preserves the simplicity and low cost of conventional Alternator designs, and can be implemented within the existing manufacturing infrastructure.