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The following publication describes the method used to calculate current waveforms optimized for minimum RMS value of the current and at the same time ripple-free output torque of the transverse flux reluctance machine. Due to the similarities with switched reluctance machines it is also applicable for this type of electric motors. The method described here, requires detailed characteristics of the...
The main power of joint-texas experimental tokamak (J-TEXT) power supply is a 100MVA pulse generator unit, which is consisted of a 1417kW motor, a 75T flywheel and a 100MVA pulse generator. The generator unit was designed in USA, with a grid of 12kV/60Hz, but in China the grid is 10kV/50Hz. Due to the difference of grid frequency, the rotational speed can only reach 5/6 of the rated value, and the...
A sensorless method named Direct Flux Control (DFC), which only requires the different voltages between a neutral point of permanent magnet synchronous machine (PMSM) and an artificial neutral point during switching states of pulse width modulation (PWM) signals, is implemented on a real time system with a PMSM. The DFC method is a continuous excitation method and can attain the estimated rotor position...
The traditional simplified flux linkage method needs the single phase conduction by turns and current chopping control method as its preconditions. However, the single phase conduction by turns results magnetic coupling between the turn-on and turn-off angle of the system, adversely, realized optimal efficiency or minimize torque ripple in the sensorless speed control system. So the improved simplified...
This paper presents a synthesis of a switching table by means of sliding mode theory for a direct power control (DPC) of electrical systems. It is applied to the control of a variable speed wind system based on a doubly fed induction generator (DFIG). Control of active and reactive stator power exchanged with the grid is achieved by delivering to rotor side converter (RsC) references voltage rotor...
This paper presents a direct torque control technique for Brushless DC motors with non-sinusoidal back electromotive force. Direct torque control has some benefits such as faster torque response and reduced torque ripple for driving the Brushless DC motors. The Sliding mode observer, which is robust to parameter uncertainties, can be used to estimate the back-EMF and generate the torque. It is employed...
This paper presents a novel fast speed response control strategy for the poly-phase induction motor drive system based on flux angle. The control scheme is derived in rotor field coordinates and employs the estimation of the rotor flux and its position. An adaptive notch filter is proposed to eliminate the dc component of the integration of signals used for the rotor flux estimation. To improve the...
This paper presents a direct current controlled pwm method for control of four-switch, three phase BLDC motor. The main features of this converter are twofold: the first is the reduction of switches and freewheeling diode count, the second is the reduction of conduction losses. For effective utilization of the developed system, a novel direct current controlled pwm scheme is designed and implemented...
This study presents bi input-extended Kalman filter (BI-EKF) based speed-sensorless direct torque control (DTC) of induction motors (IMs). For this aim, all states required for the speed-sensorless control system as well as commonly known parameter uncertainties related to stator resistance Rs, rotor resistance R'r, and load torque tL including also viscous friction term have been estimated by using...
This paper presents the idea of using the Switched Reluctance Motor (SRM) as an alternative to previously used drives, in wide good and other industrial applications. In order to show the advantage of the SRM, the speed control of a switched reluctance motor (SRM) is designed by blending two artificial intelligence techniques, genetic algorithms and fuzzy PI control. Here the Genetic Algorithm (GA)...
In this paper we propose the use of a multisensor switching strategy for fault tolerant speed-sensorless vector control of induction motors. The proposed strategy combines three current sensors and associated observers that estimate rotor speed and flux. The estimates provided by the observers are compared at each sampling time by a switching mechanism which selects the sensors-observer pair with...
In this paper, experimental results for a singularity-free control algorithm capable of adapting for unknown control direction is presented. Specifically, the adaptive control design is implemented on a simple DC motor/inertial load system where the influence of the voltage control input is uncertain. Specifically, the controller is not sure whether a positive/negative torque is produced when a positive...
A variable structure sliding mode unknown input observer (VSSM-UIO) is investigated to estimate the speed of permanent magnet brushless DC motor (BLDC) in this paper, which features in very good robustness to the parameters uncertainty and disturbance. Using the phase voltage mathematical model of BLDC, the observer is deduced by supposing back-EMF as an input disturbance, which has a good performance...
A high torque ripple in a given motor always presents a challenge for the speed control, since this ripple may lead to excessive actuation and ultimately may even lead to instability. The conventional solution is to low pass filter the measured speed, but this lowers dynamic control performance. This paper presents a new method to accurately calculate the average speed and a time variant approximation...
This paper proposes a modeling method for characterization of single-phase brushless dc (BLDC) fan motors in applications to information appliances. The nonlinear back-EMF induced by the rotor flux with stator winding is modeled by a look-up table. By parameter identification and computer simulation, this modeling method assists designers in waveform analysis and control loop design. Simulation results...
This paper proposes a fuzzy sliding-mode speed controller for high performance IM drive application. The sliding-mode speed controller of asynchronous induction motors is discussed firstly. Then, the fuzzy control is used for optimizing the switching on the sliding surface. Finally, the robust performance of the speed controller is validated with simulations and experiments.
Induction motor speed sensorless torque control, which allows operation at low and zero speed, optimizing both torque response and efficiency, is proposed. The control is quite different than the conventional field-oriented or direct torque control. A new discontinuous stator current FPGA based controller and rotor flux observer based on sliding mode and Lyapunov theory are developed analyzed and...
This paper presents a novel sensorless control architecture, which is dedicated for mixed-mode IC implementation, for many low-cost applications of brushless DC (BLDC) motors over wide speed ranges. In order to measure the back-EMFs over a whole PWM switching cycle from low to full duty ratio, a hybrid back-EMF zero-crossing detection circuit is presented to sense and compare the back-EMFs without...
The switched reluctance motor (SRM) has many benefits owing to its low cost, simple and rugged construction, and comparatively high torque-to-mass ratio. Because of the saturation effect and the variation of magnetic reluctance with respect to rotor position, all the relevant characteristics of the machine are highly nonlinear functions of both rotor position and phase current. The ultimate outcome...
A matrix converter is an electricity converter to operate direct conversion of variable voltage variable frequency (VVVF) without DC link part. Some applied examples of motor drives by the matrix converter are shown [1]. This paper presents basic characteristic of parallel-connected dual induction motor drives with the matrix converter. Purposes of this system are low cost and saving space in the...
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