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As a new type of automatic transmission in recent several years, dual clutch transmission (DCT) owns the advantages of both automated manual transmission (AMT) and hydraulic automatic transmission (AT), and shows a huge development potential in automatic transmission family. In this paper, a dynamic model of the shift process for a six-speed wet-type DCT is presented, the simulation model has been...
To meet the need of main drive motor and the low speed high torque requirement of load, a synchronous motor and gear reducer were used .However, they have many serious drawbacks, such as high cost, low transmission efficiency ects. In this paper, a novel structure of motor which the number of slots per pole per phase q is less than 1 was proposed. It can solve the problems in direct drive system and...
The permanent magnet synchronous motor (PMSM) is increasingly playing an important role in alternating current(AC) transmission system. Recently, lots of researches have been investigated for the PMSM system without speed and position sensors. The Vector-control system based on fuzzy self-tuning PID is proposed in this paper. The new algorithm based on fuzzy self-tuning PID can improve the performance...
In this paper, an optimization is reported for the determination of time response (Tr) and power (P) of Electric Vehicle. The electric constant of back-electromotive-force, stator d- and q- axes inductances, switching period, battery voltage, stator resistance and torque gear ratio were selected as factors being able to influence the Tr and P. The optimization process was carried out with Doehlert...
The saving energy with train operation is more important than before from the view points of the global environment. However the energy saving design on the traction equipments sometimes has a trade off relation against the down sized and lighter weight traction equipments. In this paper, an optimizing method of the generic algorithm is applied to the numerical simulation to calculate the consuming...
This paper presents a new technique for online identification of an induction motor rotor time constant. The technique is designed for a shaft-sensorless indirect field-oriented control induction motor drive with a model reference adaptive system (MRAS)-based speed estimator. The MRAS estimator is sensitive to the changes in the rotor time constant, and on line identification of that parameter is...
This paper investigates the possibility to use a power split electric Continuously Variable Transmission e-CVT as the core of a vessel power management unit which is able to produce both mechanical power for driving the propeller shafts, and electrical energy for supplying the onboard electric power system. The proposed system can be operated in three modes: full electric, full thermal and hybrid...
The central European 16.7-Hz railway grid is fed-beside by own power sources- by rotary and static converters. In context of recent low-frequency stability problems in the Scandinavia region, primary the interaction of four-quadrant line-side traction-converter control and surrounding rotary converters is a major concern. Therefore, adequate models for time-domain simulation are necessary. In this...
The power chain of a cable car has to meet special requirements concerning grid coupling and drive concept: On the grid side very low short-circuit power is available and on the drive side the bearable torque ripple is very low. Due to the long cable connections, the use of very line friendly line-side converter topologies and control concepts is a must. The minimization of the torque ripple is the...
This paper presents the design and analysis of a novel machine family of Slotless Permanent Magnet Brushless DC motors (PMBLDC) for precise positioning applications of spacecrafts. Initial design, selection of major parameters and air gap magnetic flux density are estimated using the analytical model of the machine. The proportion of the Halbach array in the machine was optimized using FE to obtain...
Interior permanent magnet-synchronous machines (IPMSM) feature many favourable properties for e-mobility application as high power density and good efficiency. However, they require careful modelling because of strong anisotropies of the rotor, as they are also known from salient-pole synchronous machines. These anisotropies are often accounted for by different values for the d-axis and q-axis inductances...
In this paper a stiffening technique for cage rotors of induction machines is proposed and analyzed, aimed at reducing the mechanical oscillations excited by the traction torque harmonics. The solution is simple, consisting of stiffening blocks inserted between couples of adjacent copper bars, overhanging from the rotor stack. The insertion of the stiffening blocks yields an increase of the lowest...
Aiming at the disadvantages of conventional analog DC speed adjusting in mine hoists, based on the analysis DC speed control system mathematical model, this article induces application of full digital DC speed adjusting device based on 6RA70 DC device. This article gives the drive system hardware configuration and software design. This system has performed stably, safely and economically, gaining...
The demand for high reliability motor drives increases every day, especially in aircraft where traditional, nonelectric systems (hydraulic, pneumatic) are being replaced by electrical actuators following the More Electric Aircraft (MEA) trend. Electric drives for aerospace need a fault-tolerant design approach to achieve reliability objectives with optimized architectures reducing redundancies, over-sizing...
The analysis of the transitory regimes of the motor is very important for the tuning of electric parameters and of the maximal values of the oscillating electromagnetic torque. Current shocks cause torque shock. They send the appliance running and binding traction device. The analysis in this article is part of a larger study that follows electric locomotive modernization - LE-040-3500 kW. By equipping...
Optically-induced forces can lead to mechanical deformation for micro- or nano-structures. Scattering optical forces and gradient optical forces, both originating from the linear momentum of light, have been widely demonstrated. Here we suggest the use of gyroscopic optical forces, originating from the angular momentum of light, to facilitate mechanical deformation. We calculated gyroscopic precession...
This paper presents a speed controller for an interior permanent magnet synchronous motor (IPMSM) based on adaptive backstepping method. IPMSM speed is acquired through extended-EMF method, which is simple to achieve and has a good dynamic performance. A novel nonlinear control strategy, backstepping, is used to design speed tracking and current controllers. The system can achieve fast speed tracking...
Firstly, to minimize the ripples of the electric magnetic torque and flux linkage produced in the conventional direct torque control (DTC) system for permanent magnet synchronous motors (PMSM); this paper proposes a expected space vector modulation (ESVM) strategy of DTC. The expected voltage was produced by SVM. PI controller was used in flux and torque controller, instead of hysteresis comparator...
Mobile robots consist of a mobile platform with one or many manipulators mounted on it are of great interest in a number of applications. Combination of platform and manipulator causes robot operates in extended work space. The analysis of these systems includes kinematics redundancy that makes more complicated problem. However, it gives more feasibility to robotic systems because of the existence...
The role of motor control in development of low back pain is subject of many researches both in theoretical and experimental fields. In this work flexion-extension movement of lumbar spine have been controlled by three different methods, including feedback linearization (FBL), PD control and their combinations. The model involves 7 links: 1 link for pelvis, 5 links for lumbar vertebrae and 1 link...
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