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Lithium iron phosphate batteries (LiFePO4) are becoming one of the main power resources for electric vehicles (EVs), and the non-uniformity of cells in a battery pack has become the bottleneck to improve battery usable capacity. Many active balancing approaches are proposed to transfer charge among the cells to achieve the uniformity based on terminal voltage. This paper proposes a new balancing approach...
A charge equalizer with a combination of asymmetrical pulse-width-modulation (APWM) and pulse-frequency-modulation (PFM) control based on modified half-bridge converter for electric vehicles (EVs) is proposed in this paper. The reliability of the charge equalizer can be enhanced because the split capacitors are not required and the soft-switching of power switches can be achieved by the proposed control...
This paper proposes a new and simple while cost-effective method for light electric vehicles regenerative brake with BLDC motor (Brushless DC Motor). The power stage topology of this electric vehicles' motor controller is similar to traditional BLDC motor controller. There is not necessary to use additional power converter, such as a boost converter, or other electric energy storage system for regenerative...
Plug-in Electric Vehicles (PEVs) have become more and more popular and make our life more convenient. But it also brings us some trouble. Because of the insufficient power capacity of the distribution feeders, excessive load may break down the whole system. For that reason, it is crucial for us to limit the amount of power through each distribution feeder. In this paper we design a distributed charging...
This paper proposes a new open-slot fault-tolerant permanent-magnet (FTPM) motor for electric vehicles. The key of the proposed motor is to introduce the open-slot stator design method into the FTPM motors, in which the halbach permanent-magnet array rotor is adopted. The proposed FTPM motor not only retains the merits of high power/torque density and high fault-tolerant capability, but also offers...
In the electric vehicle(EV) system, the Technology for the efficient operation of a battery is one of the most important technologies. By the voltage difference between the cell and between modules of electric car battery, it will not be able to efficiently use the battery. Using the voltage balancing method to each of the battery modules to increase the available space for the battery module, it...
The hardware and control algorithms of low cost scheme for integrated dual AC motor drive system with the function of a rectifier to perform as single-phase on-board electric vehicles (EVs) integrated battery charger are presented in this paper. In the system, a five-leg inverter is proposed; two legs are for the auxiliary motor, three are needed for the main traction motor. Both motors are three...
Multiple-motor drive system is usually adopted in electric vehicles, high speed rail and some industry applications, such as textile, steel and paper making. In order to save cost and simplify structure, a dual permanent magnet synchronous motors (D-PMSMs) drive system fed by a five-leg inverter is investigated in this paper. Based on the space vector pulse width modulation (SVPWM) method, unity power...
This paper presents a comparative study of constant power speed range of permanent magnet brushless (PMBL) machines with different d-axis inductance for electric vehicles (EVs). According to the flux weakening principle, three typical operation cases, namely, characteristic current is higher, lower than and equals current limitation, are given and analyzed in details. By the finite element analysis...
This paper presents an electric vehicle battery charger based on a new LLC converter with two transformers in parallel. This topology achieves zero-voltage switching (ZVS) for main switches in entire load range and zero-current switching (ZCS) for output rectifier diodes under certain conditions. Moreover, the resonant tank consists of two transformers in parallel to avoid high magnetizing current...
This paper proposes a method to drive a three phase induction motor with a two phase inverter using field oriented control (FOC). FOC is suitable because it can produce full torque at zero speed and is capable of quick response. This strategy is also applicable during inverter failure. In this paper, design strategy and some results of an FOC controlled two phase inverter will be presented.
At present, the battery management system (BMS) of lots of electric vehicles (EV) with different types cannot communicate normally with AC charging piles in residential quarter. The paper proposed a coordinated charging strategy for EV aggregator in residential quarter without collecting the state of charge (SOC) of EVs. The method obtains the constant charging time of EVs by certainty analysis, then...
In Electric Vehicle (EV) application, a torque reference of IPMSM (Interior Permanent Magnet Synchronous Motor) depends on accelerator operation. As a torque reference changes instantaneously, IPMSM drive system requires fast current response to track a torque reference. General PI control which is used in industrial application causes time delay in transient state. To improve the performance of control,...
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