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Integrated charging (IC) technology in electric vehicles (EVs) employing conventional power electronics and motor drivetrain components facilitates level 3 fast charging capabilities with reduction in overall weight and cost of the vehicle. However, when the winding inductances of 3-phase interior permanent magnet synchronous machines (IPMSMs) are realized as line inductors for battery charging, due...
In this paper, a novel 3-D sub-domain analytical model is developed to determine magnetic flux distribution in single-cage induction machines (IMs) with skewed rotor bars under no-load condition in an effort to more detailed analysis of spatial harmonics. The proposed model, along with an optimization algorithm, is as an alternative solution to finite-element analysis (FEA) in optimizing the geometry...
In order to design and control a permanent magnet synchronous machine (PMSM) for superior performance over a wide speed range, comprehensive testing methods with accurate measurements are of paramount importance. Moreover, in order to extract the maximum operating capability of the machine with inverter and magnetic saturation, accurate determination of dq-axis inductances over a wide speed range...
In Surface Permanent Magnet (SPM) Synchronous machines with fractional slot concentrated windings (FSCW) configuration, few slot/pole combinations exhibit large spatial harmonic and sub-harmonic fields. Spatial harmonics result in distorted voltage waveforms and cause additional losses thereby deteriorating the machine's performance. From background literature, it has been found that these harmonics...
In this paper, a novel 3-D sub-domain analytical model is developed to determine magnetic flux distribution in a squirrel-cage induction machine with skewed rotor bars under no-load condition. The analytical method is based on the resolution of 3-D Laplace and Poisson's equations in cylindrical coordinates using separation of variables method to calculate the magnetic vector potential for corresponding...
Removal of the gear-box from a conventional all-electric vehicle (EV) power-train and incorporating direct-drive topology is expected to improve motor-to-wheel efficiency. Firstly, this paper discusses the merits and challenges of a novel direct-drive scheme employing a single on-board motor in an EV. Thereafter, motor design targets established for such an application in a typical super-mini EV are...
Surface Permanent Magnet (SPM) synchronous machines with fractional slot concentrated windings (FSCW) have been found to provide high torque density with low torque ripple and cogging torque, making them suitable for direct-drive electric vehicle (EV) application. This paper initially analyses a 3-phase 36/30 FSCW SPM machine for direct-drive application in terms of its space harmonics, steady-state...
Direct-drive electric vehicle motors have requirements such as high-torque, low-speed and a constant power speed range (CPSR) between 3 and 5 depending on the tire size. Furthermore, these motors must deliver lower cogging torque and torque ripple when compared to conventional electric vehicle high-speed motors due to absence of any damping mechanism. Surface permanent magnet synchronous machines...
Understanding the need for improvement in efficiency of an electric vehicle drivetrain system, this paper exclusively discusses various design aspects of a permanent magnet machine drive for direct-drive electric vehicles (EV). Firstly, the motivation to employ a direct-drive configuration in EV is discussed. Thereafter, initial electric machine rating design considerations for a typical Supermini...
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