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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...
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...
Variable voltage and frequency supply to a.c drives is invariably obtained from a three-phase voltage source inverter. A number of Pulse width modulation (PWM) schemes are used to obtain variable voltage and frequency supply. The most widely used PWM schemes for three-phase voltage source inverters are carrier-based sinusoidal PWM and space vector PWM (SVPWM). There is an increasing trend of using...
The paper presents a complete mathematical analysis of a sinusoidal BLDC motor commutation. The motor is supplied from a DC source via a 6-leg inverter using the 120degON operation. The commutation period of 60 electrical degrees is divided into two sub-periods, for which the corresponding differential equations are solved using the initial and final conditions. The obtained model is simple to apply;...
High speed compact BLDCM (Brushless DC Motor) is much used for a robot and medical application because of the high torque and high speed characteristics. This paper presents a simple PLL based speed control scheme for a high speed compact BLDCM. Without any complex calculation of actual speed and design of speed controller, a simple phase difference between reference and actual hall sensor signal...
Direct torque control based on space vector modulation (SVM-DTC) preserve DTC transient merits, furthermore, produce better quality steady-state performance in a wide speed range. In this paper, a torque fuzzy logic controller was designed to substitute the original torque PI controller, and a fuzzy SVM-DTC system based on the torque fuzzy controller was given. A new integration algorithm for estimating...
PWM technology has been widely used in motor drive systems today. To avoid the short-circuit condition, dead-time must be inserted to the PWM driving pulses. The addition of dead-time increases the harmonic of output voltage, makes the waveform of winding current more badly. The ripple of motor torque and speed is also increased by the addition of dead-time. The influence of dead-time is more remarkable...
This paper presents a high performance direct torque control (DTC) theme for the induction motor (IM). To solve those problems associated with conventional DTC, such as high current, flux and torque ripple, variable switching frequency, the space vector modulation (SVM) is implemented in the DTC to guarantee the constant switching frequency of the inverter. Meanwhile, the design of a robust speed...
A novel sensorless control for switched reluctance motor (SRM) driven by the three-phase full-bridge inverter is proposed. The most commonly used drive for SRM is the asymmetric half-bridge inverter but its main disadvantage is the cost due to the number of switches and diodes required to realized the drive, in comparison with the much cheaper and more widely available three-phase full-bridge inverter...
The configuration of a permanent magnet synchronous motor (PMSM) system of one dual-redundancy PMSM and two inverters is presented in this paper. The angular difference problem is studied because the two motors are connected to the same shaft with a different alignment, and the importance of compensating the angular difference is presented. In addition, this paper offers a method to measure the angular...
The dual three-phase induction motors can eliminate the pulsing torque of 6 times the fundamental frequency. In order to acquire more improvement, the lowest pulsing frequency should be increased further while the magnitude decreased. Torque pulsation is caused by the harmonic currents of order 6nplusmn1 (n=2, 4......). So the key to eliminating the pulsation is reducing the substantial harmonics...
A newly control strategy for brushless dc motor drives is present. The three-dimensional X-Y-Z coordinate is adopted, and the off-phase axis is put on the Z axis, while the axis of two excited-phases on the XY plane. Compared with the complicated three dimensional locus of voltage vector and flux-linkage vector, their projections on XY plane are more concise. The projections of voltage vector are...
A novel maximum power point tracking (MPPT) strategy is presented in the paper. When wind speed varies, the wind turbine could obtain a big torque difference by adopting the novel strategy to achieve the aim of tracking the optimum turbine speed fleetly. The square wave permanent magnet synchronous generator (PMSG) is adopted in this paper for considering the characteristic of the diode rectifier-Boost...
To compensate the voltage imbalance of the two split dc-link capacitors in a four-switch three-phase inverter fed direct torque control system, a modified space vector modulation (SVM) approach is proposed in this paper. The theory, design, and implementation of the modified SVM based DTC are discussed in detail, a new sector division method based on the real basic voltage vectors is introduced and...
The transient and steady state operations of a closed loop variable speed 6-pulse PWM inverter-fed permanent magnet synchronous motor [PMSM] drive system are simulated. Performance of the system covering important operational aspects while using a hysteresis controller or a modified predictive current controller were evaluated over a wide range of speed. Comparison of the results provide insight into...
In this paper, a new direct torque control (DTC) method of multi-phase induction motor for electrical propulsion is proposed. The classical DTC method for three phase induction motor uses the hysteresis-loop controller based on the switching table, in which the stator flux and torque ripple exists obviously. The new DTC method mentioned above applies the space vector PWM (SVPWM), which can achieve...
This paper mainly discusses several methods on widening the speed-regulating range of rare earth permanent magnet brushless direct current motor (BLDCM). The simulation of traditional three-phase inverter structure and the three-phase bridge based on Buck chopper is analysis on the speed-regulating range. The calculation formulas of inductance and capacitance in Buck chopper are given. DSP is designed...
The permanent magnet brushless DC motor speed control system (PMBDCSCS) is simple control, high power density and high performance, and used in many domains. The voltage inverter used widely in the PMBDCSCS operates commonly in the six PWM methods: H_PWM_L_PWM, ON_PWM, H_PWM_L_ON, H_ON_L_PWM, PWM_ON and PWM_ON_PWM. In this paper, the six PWM methods are introduced in theory and are compared in detail...
Four-switch three-phase inverter (FSTPI) is usually adopted as the topology for continuous fault-tolerant operation of a direct torque (DTC) system when inverter fault occurs. Due to that the FSTPI can only provide four voltage space vectors with unequal amplitude, the DTC system performance will deteriorate to a certain extent. To enhance the performance of permanent magnet synchronous motor (PMSM)...
Speed control of salient pole permanent magnet synchronous motor (PMSM) is studied based on energy-shaping and port-controlled Hamiltonian (PCH) system theory. Firstly, the PCH speed control model of PMSM is established. Secondly, the desired equilibrium point of the system is obtained based on maximum torque per ampere (MTPA) control principle. Then the speed controllers are designed when the load...
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