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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...
A simple robust control method based on an observer with a multiple integrator plant model is investigated for a DC motor based drive with a flexible load. The problem of controlling the drive with unknown parameters and an external load torque is converted to the simple task of state control of the known plant model. The only information required for commissioning is the specified closed loop dynamics...
This paper introduces a new simple sensorless algorithm of estimating the permanent magnet synchronous motor (PMSM) speed and position. The proposed estimation method is implemented using a stator flux/current and a modified back electromotive force (EMF) observer connected in cascade. The flux/current observer based on sliding mode techniques ensures stator currents convergence while the modified...
In order to enhance the tracking performance of the naval artillery servo system, in this paper, a digital servo system was designed, which has the control platform based on DSP as the position loop controller instead of the old analog control platform, has larger power converter equipment as speed loop controller and has the AC motor as the actuator. On the basis of the system, the PID-like fuzzy...
In the single phase induction motors, backward mmf causes torque and speed pulsations. This paper presents a new method to eliminate the instantaneous backward mmf to improve the performance of the single phase induction motor. In the proposed method a calculated reference current which is in quadrature with main winding current instantaneously, is injected to the auxiliary winding. The “Hilbert transformation”...
In this paper, a simulation model of PMSM position servo system is presented briefly first, we then propose a high order periodic adaptive learning compensation (HO-PALC) method for cogging effect on PMSM position and velocity servo tasks. The cogging force is considered as a position-dependent disturbance that is periodic. The key idea of the implemented cogging disturbance compensation method is...
This paper presents a method for modeling and simulation of switched reluctance machine (SRM) system assisted by Maxwell SPICE tool and Simplorer environment. The nonlinear magnetization characteristics of flux linkage and torque for the machine have been considered and calculated by finite element analysis (FEA). From 2D FEA results, a dynamic equivalent circuit of SRM ECE model is constructed into...
This paper introduces the structure of synchronous reluctance with permanent magnet (SR-PM) motor and its principle of direct torque control (DTC), especially focuses on characters of DTC in SR-PM motor. Then the (position/speed) sensorless strategy of SR-PM motor is studied. The key point of sensorless control is estimating the torque angle delta precisely. This paper presents two different compensating...
A phase-difference angle (PDA) controlled pulse width-modulated (PWM) inverter instead of phase voltage modulation and/or frequency changing is proposed to control the speed, and position of a two-phase induction motor. Several characteristics of a two-phase induction motor driven by the PDA inverter are studied to verify the improvement of the motor performances. Also, speed, and position tracking...
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