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A new asymmetrical hybrid multilevel inverter topology is presented. The new topology improve the number of the output voltage level greatly through cascading two five-level H-bridge cells. A hybrid PWM strategy is proposed for the new topology that the switches of different cells works in different switching frequency to low switching losses. Lastly, an experimental 17-level asymmetrical inverter...
Abstract-Due to nonlinear electromagnetic characteristics of Switched Reluctance Motor (SRM), as well as complexity of voltage and current waveforms, it is of great difficulty to control SRM optimally and compute power losses. A novel optimal control strategy of Non-Energy Returnable Current Chop (NERCC) was proposed, which is suitable for high power SRM drive. This method can obtain current waveform...
This article presents speed controlling for single phase induction motor. Principally, 9-level, diode-clamp inverter used to control voltages per frequency is widely used because of its high efficiency to control the motor. In this article, ARM7 model ADU7024 is used as microcontroller to generate eight pulse signals and send to the output voltage amplifier by co-connecting to the modulation module...
This paper presents a jerk-constrained time-optimal control (JCTOC) method for a positioning servo. While high jerk, the derivative of acceleration with respect to time, can cause problems such as vibrations and high wear to mechanical parts, it is then important to limit the maximum jerk in many control applications. Many trajectory planning methods have been proposed, limiting the maximum jerk during...
This paper presents design and implementation of voltage source inverter type SVPWM for control a speed of induction motor. This scheme leads to be able to adjust the speed of the motor by control the frequency and amplitude of the stator voltage, the ratio of stator voltage to frequency should be kept constant. The model of control system is implemented in real time Xilinx FPGA XC3S 400E and PI controller...
This paper presents a realization of the space-vector pulse-width modulation (SVPWM) strategy for control system induction motor (IM). In this paper is presented a space vector PWM algorithm for four switch three phase inverters (B4, FSTPI) based on the one for six switch three phase inverters (B6, SSTPI) (principle of similarity) where the ???? plan is divided into 6 sectors and the formation of...
SRM is suitable to be used as drivers of electric bicycle (E-bike). A nonlinear dynamics model based on Matlab/Simulink of E-bike and four regenerative braking strategies of SRM are presented in this paper, such as most feedback power control strategy, most feedback efficiency control, fixed torque control, fixed feedback current control. A hybrid control strategy of PWM mode and current chopping...
Switched reluctance motors (SRM) have gained more popularity in recent years because of their simple structure, low cost, high reliability, and high torque-to-mass ratio. However, the applications of the SRM have been limited because of their large torque ripple, which causes noise and vibration problems. In order to solve these problems, Ca novel direct torque control (DTC) methodology is directly...
The magnetic circuit of switched reluctance motor (SRM) is seriously nonlinear because certain parts of the stator and rotor may go into magnetic saturation and the mutual inductance will be large when the motor works at two-phase excitation. These factors make the control of winds current very difficult. This paper analyzed the inductance of 8/6 SRMs including mutual inductance. Then a novel current...
A high performance modular three-phase utility-interactive converter is designed and implemented in this paper. This converter has three operation modes: grid-connection inverter mode, stand-alone inverter mode and rectifier mode. Control principles and modes of every mode are analyzed in detail and the modular design method is adopted. A simple but valid control strategy is proposed. Finally a 10...
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...
A novel control method for Permanent Magnet Synchronous Motor (PMSM) position servo systems is presented, which can greatly improve the dynamic performance of servo systems. In this method, the maximum reaching velocity control is introduced to reconstruct the conventional three closed-loop PID regulators. Under the new velocity and position control modes (two-segment modes), the PMSM servo systems...
Five-level inverter has been applied to industry and railway traction to solve the difficulty in applying low-voltage or medium-voltage switch devices to high-voltage system. The basic principle of diode-clamped five-level inverter is analysed in this paper. Based on the analysis of diode-clamped three-level inverter, single pulse control method, pulse width modulation(PWM) control methods and a novel...
The developed switched reluctance starter/generator system in low voltage is presented, which is made up of the three-phase 12/8 structure double salient reluctance machine, three-phase asymmetric bridge single polarity power converter and the controller. The three-phase 12/8 structure double salient reluctance machine, the three-phase asymmetric bridge single polarity power converter and the control...
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...
In this paper, the sensorless control of the interior permanent magnet synchronous motors using the sliding mode and the binary observers are compared. Also, the structure of the above observers only uses the voltage equation. Since the parameters of the dynamic equation such as machine inertia or viscosity friction coefficient are not well known and these values can be easily changed during normal...
This paper presents a digital implementation of two-axis position control of microstepping bipolar drive with the controlled current, depending on the load torque applied. The topology of power converter for each motor is the conventional three-phase inverter, using space-vector pulse-width-modulation (PWM) technique. It is well known that the microstepping technique allows the stepping motor rotating...
To solve the problems of torque ripple and inconstant switch frequency of inverter in the conventional direct torque control (DTC) for permanent magnet synchronous motor (PMSM) drive, a novel DTC method using space vector pulse width modulation (SVM) is proposed based on analysis of PMSM mathematical model. In this novel DTC system of PMSM , traditional torque hysteresis controller and flux hysteresis...
A design of two-phase hybrid stepping motor driver with current closed-loop control based on the PIC mcu has been presented. A microstepping technique has been implemented in order to meet the requirement of constant torque and smooth movement, which adjusts the current in each winding in sinusoidal fashion. Binary and decimal subdivision are achieved by software programming in the PIC microcontroller...
This paper presents switched reluctance motor (SRM) torque ripple minimization based on the modified multi-level converter. The TSF control has a low torque ripple, good dynamic performance and high efficiency. And the proposed modified multi-level converter has low cost and high performance. For integrated advantages of the TSF method and the proposed modified multi-level converter, a suitable control...
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