Hideki Miyazaki Tatsuyuki Yamamoto Hitoshi Kobayashi Atsushi Yokoyama OVERVIEW: Hitachi researches and develops control technologies and systems for electric vehicle motors that provide better energy effi ciency and safety. This has included using an EV test vehicle to demonstrate the use of the electric motor in traction control and antilock braking, utilizing the rapid changes in torque made ...

It has been suggested that myosin II exerts traction forces at the posterior ends and retracting pseudopodia of migrating cells, but there is no direct evidence. Here, using a combination of total internal reflection fluorescence (TIRF) microscopy and force microscopy with a high spatial resolution of approximately 400 nm, we simultaneously recorded GFP-myosin II dynamics and traction forces un...

The paper present’s a survey of the wheel vehicles drives with electric and hybrid drive system. For electric and hybrid vehicle applications, wheels motor and magnetic circuits cutting motor drives, represented a new attractive solution for their lightness and compactness. The wheels are directly driven by the electric motor, and the gears are not necessary anymore. An alternating solution of ...

A dominating source for the radiated acoustic noise from a train at low speeds is the traction motor. This noise originates from electromagnetic forces acting on the structure resulting in vibrations on the surface and thus radiated noise. It is often perceived as annoying due to its tonal nature. To achieve a desirable acoustic behavior, and also to meet legal requirements, it is of great impo...

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In development and testing by DuPont with ABB Industrie AG Switzerland (a subsidiary of the multinational ABB group) and Siemens AG, two of the world’s foremost traction motor manufacturers, Kapton CR shows corona resistance or voltage endurance of greater than 100,000 hr at 20 kV/mm (500 V/mil) at 50 Hz. Kapton CR also provides twice the thermal conductivity (0.385 W/m·K) of standard Kapton. T...

The paper deals with a Dual Induction Motor control. A control strategy based on the Average Differential Control (ADC) is developed and adapted to work as an anti-slip control in a railway traction system. In addition to cancel the behaviour deviation between the motors supplied by a single inverter in case of an adhesion loss (or an unbalanced load), the proposed control strategy permits an a...

This paper describes slope traversability analysis for a planetary exploration rover based on a terramechanics approach. In this research, the slope traversability is defined as consisting both of slope climbing and traversing (crossing) capabilities. The authors have been investigated traction mechanics between a wheel of a rover and loose soil. Applying our advantages in the wheel-soil intera...

These Interior permanent magnet machines using integral slot windings or non-overlapping concentrated windings are designed for traction applications. Four direct drive traction motors are analyzed: two 25 kW motors and two 100 kW motors at rated speed of 1000 min. Analytical computations are verified by finite element analysis utilizing Cedrat’s Flux2D. Concentrated tooth coil winding machines...

In modern traction propulsion applications, voltage source inverter (VSI) fed traction motors today operate very close to borderline conditions. With new emerging semiconductor technologies, higher inverter switching frequencies will be possible and high inverter dv/dt-rates appear, resulting in transient overvoltages at the machine which increase the stress on the insulation system and lead to...