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The electrical machines are gaining more and more attentions nowadays, especially for the electric vehicle application. Compared with the radial flux machine, the axial flux machine can have higher torque density and efficiency due to its tight structure. However, most of the axial flux machines are designed with the surface mounted permanent magnets (PMs) rotor, where the reluctance torque ability...
This paper presents the electromagnetic and thermal analysis of a salient-pole synchronous machine and a permanent magnet synchronous machine with very high torque density for a wheel hub traction drive in an electric vehicle. In order to find the best trade-off between a very high peak torque and a high efficiency throughout the whole operating range, four highly utilized machines with an outer rotor...
The electric drive system is one of the most important parts of electric vehicles (EVs), whose function is the conversion between electric energy and mechanical energy. Switched reluctance motor (SRM) has the features of simple construction, high starting torque, wide speed range, high efficiency and high reliability which are appropriate for EVs drive system. Firstly, instantaneous torque control...
Estimation of dimension parameters for an electrical machine has great importance before manufacturing. For this reason, analytical design should be performed in an optimum form. While motor analysis is accomplished by package programs, initial size parameters are intutivily provided and then various trials are examined to get optimum results. In this study, we are trying to find dimensional and electrical...
The design process of direct-driven permanent-magnet (PM) synchronous machines (PMSMs) for a full electric 4 4 sports car is presented. The rotor structure of the machine consists of two PM layers embedded inside the rotor laminations, thus resulting in some inverse saliency, where the -axis inductance is larger than the -axis one. An integer slot stator winding was selected to fully take...
A Unified Field Dual Mechanical Machine is proposed in the paper, which features as spoke type PM arrangement. The presented machine has superior torque behavior compared with traditional type IPM machine. The d-axis current in the new machine has better utility, which make the presented machine a perfect match with the electric vehicle. The torque strengthen effect is analyzed with FEA, and the regular...
This paper presents a comparison of different permanent magnets synchronous motors (PMSM) having a high homopolar or zero-sequence inductance. The high value of zero-sequence inductance is particularly a necessity for certain applications in which the winding coupling is not in Wye connection. Thereby, the homopolar currents which are sources of losses are reduced and minimized. In this study, we...
The electric vehicles need high efficient torque control system. Therefore, this paper proposes the novel excitation interval control method. The excitation intervals are concentrated around the rotor position where the derivative of inductance becomes maximum values. The efficiency of proposed method is superior to the efficiency of conventional methods.
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