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This paper presents an improved speed sensorless vector control method for general-purpose induction motors (IMs). The proposed method is based on the d-q axis dynamic model of the induction motor and an improved closed-loop flux observer, which can achieve precise rotor and stator flux estimation over a wide speed range. And then, a rotor-speed-estimation method, based on fuzzy control theory, is...
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...
Two magnetic fields produce radial force on rotor when the difference of their pole pair numbers is 1. Based on this principle, this paper introduces the bearingless motor with a single set of 5-phase windings. The MMF waveform produced by multiphase windings is analyzed, based on which the winding configuration of 5-phase bearingless motor is introduced. The two needed magnetic fields are produced...
This paper has analyzed the vibration and acoustic noise caused by electro-magnetic torque fluctuation of brushless DC motor (BLDC motor). Through the analysis of electromagnetic torque, its components were determined: this paper proposed that electro-magnetic torque consists of a cyclical fluctuation whose harmonic frequencies are 6n (n=1, 2, 3......) times of phase current frequency. By measuring...
Compared with traditional fuel vehicles, electric vehicles need to deal with the problem of mapping relationship between accelerator pedal and motor-driving torque. At present, this problem is mainly resolved by means of PID control and Fuzzy control. However, the issues on stability, real-time performance, adaptability and complex achievement follow, too. In this paper, a neuromuscular-like model...
To solve the problems with the conventional direct torque control (DTC) of high speed permanent magnet synchronous motors (PMSM), a variable structure sliding mode direct torque control (VSS-DTC) without sensor is proposed in this paper. The control law of high speed PMSM VSS-DTC and the methodology of speed estimation are presented. The simulation model of the sensorless VSS-DTC system is built and...
Direct torque control of brushless DC motor (BLDC) is complex for turn-off phase. And the direct torque control of brushless DC motor based on hyper space vector solved the problem, however, the torque ripple was obvious. A modified method is presented in this paper in order to reduce the torque ripple based on hyper space vector. For the turn-off phase only affects the stator flux linkage but not...
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...
In this paper, a novel passive boost converter for SR drive with high demagnetization voltage is proposed. A simple passive circuit is added in the front-end of conventional asymmetric converter, which consists of three diodes and one capacitor. Based on this passive network, the two capacitors can be connected in series or parallel in different operation status. So the terminal voltage of the converter...
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...
As a motor designed for electric vehicles (EVs), the stator-doubly-fed doubly salient (SDFDS) motor has the advantage of regulating the field flux independently and effectively. To satisfy the demands of high efficiency and fast torque response in wide range of velocity for EVs, a loss model based controller (LMC) is used to realize the on-line efficiency optimization and high dynamic response of...
To minimize the ripples of the torque and flux linkage and to fix the variable switching frequency produced in the conventional direct torque control (DTC) system for permanent magnet synchronous motors (PMSM), the fuzzy controller was introduced into the PMSM DTC, and a PMSM Fuzzy DTC system based on DSP TMS320LF2407 was implemented. Experimental results show that the proposed Fuzzy DTC system has...
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...
This paper presents the analysis and operation of doubly fed induction generator (DFIG)-based wind power generation system under unbalanced network voltage conditions. The limited voltage and current ratings, the control capabilities of both the grid-side and the rotor-side converter (GSC & RSC) for unbalanced network voltage compensation are investigated in detail. A new current control scheme,...
Several types of interior permanent magnet synchronous motor have been utilized in the wide rage of applications. The characteristics of their cogging torque and average torque and d and q- axis inductance were clarified for the different shapes of rotor magnet and two types of stator windings. This paper clarifies the characteristics of radial attractive force and vibration for the different shapes...
The V/F controlled induction motor driver systems always suffer from middle frequency oscillations under light load conditions. Many methods were sponsored but always complex and parameters dependent. This paper present one simple and reliable method which can improve the systemspsila stability: First, one efficient dead-time compensating method was present, which can reduce the distortion of phase...
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 brushless DC motor with two sets of control channels is presented in this paper; it will be used in an electro-mechanical actuation (EMA) of the next generation more electric-aircraft (MEA). If either of the two channels is failure the motor work under the single channel mode, i.e. fault tolerant operation mode. There exists mutual inductance between the two sets of control channels, so the parameters...
In this paper, a speed estimation and control strategy for induction motor drive based on an indirect field-oriented control is presented. The rotor speed estimator based on a RBF neural network utilizes stator voltage and current measured values to calculate the rotor speed, and the control approach based on a sliding-mode controller with an integral sliding surface is proposed in order to regulate...
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