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This paper presents the results of research into the application of an active battery switching system in the drivetrain of a prototype electric vehicle. The system's purpose is to increase the drivetrain's electrical efficiency especially in the partial-load range. Efficiency is increased using a switching unit that allows the vehicle's traction-battery circuitry to be changed during operation and...
In this article a three-phase BLDC motor controller for use in an Ultra-Light Electrical Vehicle is presented. The control is performed using a Programmable Logic Device (CPLD), which doesn't require any additional processor. In this way a robust and low-complexity control is obtained. For extending the speed range of the BLDC, a phase advance circuit is implemented as well. The power consumption...
Interior permanent magnet synchronous machines (IPMSM) are preferably used for traction drives in electric vehicles. These are characterized by high efficiency and high torque as well as power density. The generation of reference currents for the field-oriented control is realized by look up tables (LUT). In these LUT the entire machine characteristic is described. The reference currents are selected...
An electrical losses (copper and iron losses) minimization control of interior permanent magnet synchronous motors is proposed in this paper. Until now a Look-up Table based maximum torque per armature current control strategy was proposed by authors. That is a control to minimize copper losses. Meanwhile, the efficiency deteriorates as a result that the iron losses increase sharply in high speed...
In this paper, first, an equivalent scalar dynamic model for the three-phase brushless dc (BLDC) motor is derived to simplify the control of the electric vehicle (EV) drive. Then, an equivalent armature current sensing technique is proposed for synthesizing the three-phase line current by using the low-side switches of the inverter as current sensors. No additional current sensors are required and...
Accurate modelling of permanent magnet (PM) DC motors is a prerequisite for expedient feedback design of electric powered mobility vehicles. This paper identifies the parameters in the ideal equations for PM DC motors and considers the methods used to measure and calculate them accurately. However, the ideal PM DC motor equations' outcomes are rarely accurate compared with actual results and measurements...
In modern vehicles, the integrated starter-alternator (ISA) is an electrical machine that has to crank up the internal combustion engine, and to generate electric power during normal driving. Therefore, the ISA has to exhibit high torque and a wide constant-power speed range. This paper reports some design criteria, analysis and test results of an ISA that has been developed using a fractional-slot...
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