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Direct Torque Control (DTC) is considered as one of the latest and most efficient techniques that can be used for the speed and/or position tracking control problem of induction motor drives. However, the main drawbacks of classical DTC are the variable switching frequency that could exceed the maximum allowable switching frequency of inverters and also the ripples it has over the current and torque,...
A novel sensor-less algorithm for decoupled control of torque and reactive power of a class of doubly-fed machines like the conventional wound rotor induction machine (DFIM) or the emerging brushless reluctance machine (BDFRM), has been proposed in this paper. The control concept has been derived from the first principles of torque production and magnetisation of the machines and requires only the...
An improvement over a recently published control strategy is presented. The goal consists in reducing the acoustic noise caused by a PWM-Controlled Induction Machine Drives. It is a technique that uses a sinusoidal modulator wave (with harmonics injection) and a modulated frequency triangular carrier signal, and after comparing them, the modulated wave is obtained. The technique generates an efficient...
A concept of an integrated and distributed inverter for switched reluctance machines is introduced. The application at hand is an outer-rotor direct drive designed for railway traction applications. A five-phase switched reluctance machine (SRM) was developed and is used to demonstrate the function of the integrated and distributed inverter. The distribution is achieved by supplying each phase coil...
In this work we present the study and identification of the frequencies of the signals implied in a sine PWM control based on DSP of electrical machines, especially in a three-phase motor of induction. We will also try this identification will be used as a basic for a later analysis of the influences they will originate in the acoustic noise level emitted by the machine.
The main features of an electric drive for electric vehicles (EVs) should be the capability to exploit the maximum torque in the whole speed range, a weak dependence on the motor parameters, a good robustness against the variations of the dc-link voltage and, whenever possible, the maximum efficiency. In this paper a control scheme for induction motors, with all these features, is presented. The performance...
This paper presents a new hybrid cascaded H-bridge multilevel inverter (HCMLI) motor drive DTC control scheme for electric vehicles or hybrid electric vehicles where each phase of the inverter can be implemented using only a single DC source. Traditionally, each phase of the inverter require n DC source for 2n + 1 output voltage levels. In this paper, a scheme is proposed that allows the use of a...
The inverter-fed induction motor drive system may become unstable at low frequencies and light load. Taking the inverter-fed five phase induction motor drive system as an example, the small disturbance mathematic model of whole system is deduced, based on small disturbance model of induction motor and switching model of inverter system, the three-dimensional unstable region is presented and discussed...
This paper presents a new position control method for transverse flux machines. Since the torque ripple is one of the most important reasons for the low dispersal of transverse flux machines, a great importance has to be attached to subordinate torque control. Based on a look-up table, the torque is controlled by a time-discrete converter state changing. Speed and position are superordinately controlled...
On the basis of the mathematics of two-phase hybrid stepping motor, a control system with current cut-off feedback for hybrid stepping motor is presented in this paper to solve the problem that the phase current decrease with increasing frequency. The system consists of a SCM, some special integrated chips and a Programmable Logic Device (PLD). The system using special integrated chip and programmable...
This text aims to solve such problems as the large pulsation of battery electric locomotive traction motor torque at low speed, the unpredictable frequency spectrum of the torque, and the large frequency and wastage of high-speed inverter switching. Starting from space voltage vector, this text adopts the method of multiple vector synthesis and mutual switch control of motor air-gap flux according...
Multilevel inverters have been used widely because of their high power capability, lower output harmonics and lower commutation losses and so on. Their main disadvantage is their complexity, requiring a great number of power devices and complex control method. In this paper, a new topology is proposed based on H-bridge cascaded inverter. The new topology produces a significant reduction in the number...
This paper researches the precision horizontal machining center feeding permanent magnet synchronous servo system of NC (Numerical control) machine and its application in the background of “High-end CNC (Computer numerical control) machine tools and basic manufacturing equipment,” science and technology major project. As the PMSM (Permanent Magnet Synchronous Machine) servo system using traditional...
Multi-phase motors are nowadays considered for high-power variable-speed drive applications due to numerous advantages that they offer when compared to their three-phase counterparts. Multi-phase voltage source inverters are invariably used to provide multi-phase variable voltage and variable frequency with appropriate pulse width modulation (PWM) control. In this paper, a novel PWM algorithm for...
This paper presents a fuzzy logic controller (FLC) based direct torque control of induction motor (IM) drive to reduce the ripple in developed torque and stator flux. First the effect of amplitude of torque hysteresis band on the torque ripple of an IM motor is discussed. Finally, a strategy to reduce the ripple in the developed torque and stator flux is proposed by controlling the amplitude of the...
With traction motor control system as the research object, this thesis proposes three-level inverter traction motor direct torque control(DTC) based on the fuzzy control, which study the control technique of traction motor. Simulation experiments show that: three-level inverter traction motor direct torque control based on the fuzzy control can not only double the capacity, but also can make the output...
This paper addresses the control design for a three-stage solid stage transformer (SST). When two or more independently controlled converter stages are cascaded, which is the case for the three-stage SST, the interaction among the stages can lead to instability. Normally, the input and output impedances of the cascaded stages need to be examined according to the impedance criterion to ensure stability...
The control algorithms proposed in the literature so far for the Double Output Induction Machine Based Variable Speed Constant Frequency (VSCF) stand alone generators suffer from the disadvantage of loss of `field orientation' during sudden load disturbance at the machine terminal. As a result, undesirable transients are observed in the load voltage during such transients. This paper presents a new...
For fluctuations of the DC bus voltage in dual PWM motor drive system, which is caused by the frequent changes in motor running, the generation mechanism is analyzed. A new control strategy for dual PWM system is proposed, which is based on EL model and the load power feed forward. By using DC steady state voltage compensation and the Power load forecasting, the stable DC voltage and the unity power...
The controller design is a challenging task for the electric propulsion system (EPS) of the hybrid electric vehicle (HEV), which influences the economical efficiency and emission performance of HEV significantly. A single-axle parallel hybrid powertrain configuration for the IVECO vehicle is described firstly. Secondly, a DSP-based controller design procedure including hardware and software is given...
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