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The multiple main motor drive system for railway vehicles is more excellent than another circuit system of one inverter and one induction motor, from the viewpoint of cost and space-saving of electric equipment. On the other hand, the motors fed by one inverter are controlled collectively. As a result, when re-adhesion control is executed, the traction force and vehicle acceleration of the former...
Electric vehicles mainly work in urban conditions. Due to frequent acceleration and deceleration, the driving and braking torques vary in a large range as well as the motor efficiency. Distributed drive electric vehicles allow for an independent and accurate torque control of each wheel. Based on that, a novel driving and regenerative braking regulation (DRBR) with respect to energy-saving is developed...
This paper presents a traction control strategy via LPV(Linear Parameter Variable) slip ratio control method for independent in-wheel motor electric vehicle. In order to simplify the controller design and implement distributed control system in each wheel, the slip ratio control model with LPV form and uncertain disturbance is derived. Furthermore, a two-degree-of-freedom LPV controller with disturbance...
One of the most important features of electric vehicles is their ability to recover significant amounts of braking energy. The electric motors can be controlled to operate as generators in order to convert the kinetic or potential energy of the vehicle into electric energy that can be stored in the battery and then reused. In a hard braking manoeuvre, the braking torque is much larger than the torque...
This paper presents the traction motor sizing for optimal urban fuel economy in two mild and three strong hybridization powertrains on front-wheel-drive vehicles. The traction motor sizes, by means of motor rated torque and speed, are optimized for maximum urban fuel economy. The two mild hybrids are Belt-Integrated-Starter-Generator (B-ISG) and Crankshaft-Integrated-Starter-Generator (C-ISG) systems...
This paper deals with the advantages of a multi-speed transmission system for an electric axle, in comparison with a single-speed layout. The selection of the gear ratios for the multi-speed application is described in detail for a case study vehicle, for two different electric motor units.
In times of increasing fuel price and environmental consciousness coming to the fore, automotive industry is forced to review its existing concepts of building cars based on combustion engines. In addition to other technologies like hydrogen or fuel cell technologies, electric cars with highly efficient battery power supply play a fundamental role. Especially electric cars with wheel hub drive offer...
For ac railway drives it is desirable to feed the parallel connected induction motors from a common inverter. However, the parallel operation depends on several influences, e.g., the type of inverter, the mechanical transmission system and the characteristic of the wheel-rail contact. In order to understand the behavior a simulation model of the system including both the electrical and mechanical...
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