The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Electric propulsion system (EPS) employing Induction Motors (IM) have gained acceptance due to their robust structure, reliability, technological advancement and low cost. This paper presents the technical considerations and design methodology of EPS for urban cars. Direct torque control (DTC) is a prominent technique in controlling the IM due to its easy configuration and fast performance. Nevertheless,...
This work investigates maximum efficiency control strategies of permanent magnet (PM) traction machine drives that are adopted in General Motors (GM) hybrid and electric vehicles. First, three different current vector control techniques, Maximum Torque Per Ampere (MTPA), Maximum Torque Per Motor Loss (MTPML), and Maximum Torque Per System Loss (MTPSL), are presented to identify the most attractive...
In this paper, the impact of transmission gear ratios selection on a Nissan Leaf EV (NLEV) is investigated. The traditional single ratio gearboxes are replaced by multiple ratio ones. The selection of the gear ratio is proved to have a significant impact on electric vehicle's performance and range. A mathematical model of a NLEV is developed for both single and multiple ratio transmission systems...
This paper presents a novel methodology investigating a characteristics of variable leakage flux interior permanent magnet synchronous machine (VLF-IPM) using arc-shaped magnets. In general, motor parameters such as magnet flux, Ψa, inductances on d-q axes, Ld and Lq, are dealt as constant values, while motor parameters need to be dealt as variables depending on load currents for VLF-IPM machines...
Referring to a 4-wheel drive Formula Student Electric vehicle, a fractional-slot synchronous permanent magnet machine has been designed. Torque density has been improved adopting outer rotor topology and lightweight materials. An ironless rotor with PMs placed in an Halbach array configuration allows reduced rotor inertia to be obtained. The results described in the paper provide a quantitative assessment...
This contribution suggests an approach to determine the optimal design of a Permanent Magnet Synchronous Motor for a given application by calculating the effects of coil configuration switching, pole-changing and multi-phase windings. The impact on the torque-speed-characteristic of a motor is evaluated in a normalized parameter plane, enabling the designer to compare the influences by using criteria...
Energy crisis's due to the depletion of fossil fuel and need of pollution free environment has leaded the world automobile technology to switch over to electrical propulsion system in place of gasoline engine in vehicles. Use of multiphase induction motors as the propulsion drive is the powerful solution for electric vehicle where the overall high system reliability and power distribution per phase...
In this paper, design aspects of a 6-pole synchronous reluctance traction motor are presented for improving the machine performance in electrified powertrain applications. An increase in the number of poles at the same current rating amplifies the output torque and reduces the torque pulsations. Moreover, in this machine, anisotropic structure of the rotor eliminates use of cage, windings, and magnets...
This paper deals with the control strategy for synchronous homopolar machine adapted for traction applications. Advantages and disadvantages of homopolar motors are first discussed. Mathematical models and variations of its design are given. The structure of the proposed control strategy is based on field oriented control but it was modified in order to achieve maximum performance according to experimentally...
Some aspects concerning the optimal design and sizing of an asynchronous traction motor are described. The motor must be integrated with a static converter in the traction system of a locomotive driving a multiple unit train. This drive system is aimed for light power applications, and the parameters necessary for the analysis of the regenerative braking system are also accounted for. An algorithm...
This paper validates the advantage of using an integrated electric vehicle-battery model in torque control application. In the integrated electric vehicle-battery model, battery dynamics is explicitly included in the model. A well-known linear quadratic integral (LQI) design is adopted here to have an optimal controller with zero tracking error. The energy consumption is, however, observed through...
Interior permanent magnet synchronous machine (IPMSM) has been widely used in traction application due to high efficiency and high power density. Nowadays, in electric vehicle application, the average efficiency over a driving cycle (AEDC) is more attractive than the efficiency over single working point. The paper deals with the design optimization of the average efficiency over a given driving cycle...
There is the high surge current emerging when the asynchronous traction motor is replaced by PMSM with power down-rejoining on. The high back EMF voltage exists when traction PMSM is passing the switching phase insulator. The reason is due to the constant value existence of the permanent magnet. Aiming at above mentioned problems, this paper analyses the reasons of causing transient surge current...
Electric vehicles are already a reality although their development and spread in urban context are encountering resistance especially due to the lack of electric vehicle charging facilities. Small electric in-wheel motors are perfectly suited to urban driving and their low electric energy consumption can also guarantee a sufficient daily mileage. The present paper proposes a rear wheel drive electric...
Torsional resonances may incur in induction drives due to large harmonic torques produced by the inverter. The torsion can affect the rotor-load system, but more sneaky resonances may arise in the rotor end-rings of fabricated-cage induction motors. Abnormal cage torsions may lead to bar breakage due to high-cycle fatigue. Since the high-frequency speed oscillations are difficult to detect, torsional...
Electrification offers a great potential for commercial vehicles to significantly reduce energy consumption as well as CO2 and pollutant emissions during operation. The project eLift demonstrates the potential of the electrification of a special-purpose vehicle. A conventional diesel catering truck with hydraulic auxiliary lifting unit is to be replaced by a more efficient electrically driven truck...
The paper deals with the vector control of two surface-mounted permanent-magnet (PM) synchronous-motors in configuration “single-inverter dual-motor”, operating also with unbalanced loads. Since this structure is justified by the objective of obtaining low cost drives, a low computation burden sensorless method is proposed in order to further reduce the system complexity. A very simple algorithm for...
Selection of drive's rated power influences not only vehicle's dynamics, but also its energy efficiency. Mentioned above approach requires a multiphysical model, which covers both mechanical and electrical phenomena. This paper discusses how selection of traction drive's rated power influences vehicle energy consumption on example of a trolleybus. A complex mathematical model was developed in Matlab/Simulink...
Interior permanent magnet synchronous motors (IPMSMs) are currently widely utilized as traction motors. The permanent magnets used in IPMSMs are an important factor; thus, high-coercivity permanent magnets with lesser rare-earth elements are in development. This paper proposes two modified versions of double-layered IPMSMs containing a strong magnet to improve their efficiency and reduce their size...
Recently, the increasing requirements and tendencies of higher efficiency systems have caused a substantial impact on electric motor design. Designers tend to change their views on motor topologies to provide the predetermined values of higher efficiency classes (such as IE3, IE4, IE5). Line-start interior permanent magnet synchronous motors (LSIPMSM) are strong candidates for higher efficiency class...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.