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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...
Removal of the gear-box from an existing electric vehicle (EV) power-train incorporating direct-drive topology is expected to improve motor-to-wheel efficiency. Firstly, this paper discusses the need for a novel direct-drive scheme employing a single on-board motor in an EV. Electric machine and drive design targets for such a supermini EV with direct-drive scheme are fixed based on analytical equations,...
Rare Earth Permanent Magnet (REPM) motor acoustics plays an increasingly important role in automotive mechatronic components and systems, due to more vehicle electrification and ever-increasing market demand. A large number of factors affect PM motor acoustic behavior. One of major contributing factors is the motor cogging torque. This paper reports industrial practice and control of motor cogging...
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...
The design of synchronous reluctance machines involves a lot of variables that usually lead to unpredictable machine performance. It is difficult to achieve a proper rotor barrier design that yields satisfactory results, in terms of torque ripple, average torque, etc. Geometry optimizations could be required to find optimum solutions on the basis of some objective functions. However, a good knowledge...
The paper deals with the design of permanent magnet synchronous traction motor (PMSM) that was based on volume and stator windings of asynchronous traction motor with an output power 210 kW. The proposed PMSM was built with permanent magnets (PM) placed on the surface of the rotor. There will be described the basic parameters as well as analytical analysis of losses in the machine, with emphasis on...
The paper deals with the design of Permanent Magnet Synchronous traction Motor (PMSM) that was based on volume and stator windings of asynchronous traction motor with an output power 70 kW. The proposed PMSM was built with permanent magnets (PM) placed as barriers into the rotor. There will be described the basic parameters as well as design and the results of type test realized on PMSM with rotor's...
Electric drive systems, which include electric machines and power electronics, are a key enabling technology for advanced vehicle propulsion systems that reduce the petroleum dependence of the ground transportation sector. To have significant effect, electric drive technologies must be economical in terms of cost, weight, and size while meeting performance and reliability expectations. This paper...
This paper introduces an enhanced permanent magnet motor, that has been optimized for small passenger cars propulsion. The proposed motor configuration utilizes efficiently the energy stored in the permanent magnets and provides optimal power density under specific size constrains and traditional material technology. Finite element modeling enables to determine the detailed motor configuration, through...
Hybrid vehicles, which employ a technology combining gasoline and electric motors, are a hot item these days for transporters looking for ways to cut their fuel bills. To date, commercial systems implement diesel assisted electrical drives. As such the electrical motor is placed in a series or parallel configuration to assist the combustion engine. In the series configuration, the generator mounts...
An axial flux permanent magnet brushless motor is designed with variable stator alignment of independent stators, thus allowing field-weakening via a controllable and variable generated-voltage constant. This feature is particularly valuable in vehicle traction motors with large constant-power speed-ratio, where there is also a strong desire to eliminate gear changes and keep the overall size of the...
An axial flux permanent magnet brushless motor is designed with selectable stator alignment of independent stators, thus allowing a controllable and variable generated-EMF constant. This feature has particular value in vehicle traction motors with large constant power speed ratios, where there is also a strong desire to eliminate gear changes and keep the overall size of the motor drive small. The...
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