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The stable operation regions are the important issues for direct torque control (DTC) system of permanent magnet synchronous motor (PMSM). The influences of the parameters, such as voltage, current, flux linkage and load angle, on the system operation are investigated through the analysis model presented in this paper. The analysis results show that the parameters must be properly regulated within...
This paper presents a comparison between Field Oriented Control and Direct Torque Control methods of a Matrix Converter-fed (MC) Permanent Magnet Synchronous Motor (PMSM). MC is becoming widely used because of the unity power factor and the lack of energy storage element. FOC method calculates the duty of MC states with use of geometric relations between voltage and current vectors. DTC method, on...
For the traditional direct torque control of induction motor, the ripple of flux linkage and torque is serious, and the inverter switching frequency is not constant. This paper proposes a deadbeat direct torque control strategy of induction motor. The control algorithm of speed identification based on model reference adaptive system is analyzed. By using back electromotive force as the error vectors...
Like all industrially manufactured products, interior permanent magnet synchronous machines are subject to deviations due to production tolerances. In particular, deviations in the permanent magnet flux and the air gap thickness cause considerably high torque errors and influence efficiency. Especially for traction drives in hybrid or electric vehicles this is not acceptable. In this paper, the impact...
This paper adopts a deadbeat-direct torque control (DB-DTC) algorithm in interior permanent magnet synchronous motor (IPMSM), which is realized by combining the deadbeat predictive control algorithm with space vector pulse-width modulation (SVPWM). In order to achieve both the smooth torque and flux linkage responses in just one sample time period, control voltage vectors are derived and the limited...
This paper firstly introduces the mathematical equations of PMSM (permanent magnet synchronous motor), an overview of direct torque control (DTC) and a DTC based on sliding mode control for PMSM, and then builds PMSM control system simulation models with above two methods in MATLAB /Simulink environment. Finally, we got the starting response, torque ripple and load perturbation responses of DTC and...
In this paper, a pure torque loop control method without flux linkage observer and a modified double closed loop control method with a couple of derived simple equations for the control of the stator flux linkage amplitude were proposed for direct torque control (DTC) of brushless DC motor (BLDCM), using a 2-phase conduction mode. The objectives of the novel control strategies are trying to simplify...
An efficiency optimization control strategy of the direct torque controlled interior permanent magnet synchronous motors is proposed. Firstly, the mathematical model of the IPMSM is established in the rotor frame considering iron losses. Secondly, the function relationship between the power losses and the output torque, speed and stator flux is analyzed, and the computational formula of the stator...
When permanent magnet synchronous motors (PMSMs) are driven in the ultra-high-speed region, it is necessary to shorten the control period because of the increase in the motor fundamental frequency. Reducing calculation amounts of drive system control for shorter control period is easily applied to applications because it requires simply changing the control software. This paper proposes a calculation...
Coasting is a fuel-saving driving mode that is usually active when the vehicle slows down. In an electric vehicle (EV), coasting can be achieved by letting the q-axis current to be set to zero. However, braking action often occurs at high speeds when the gas pedal is tipped off. That is, negative torque is produced while the q-axis current is equal to zero. Such a braking torque reduces the coasting...
DC power technology of permanent magnet synchronous generator (pMSG) has been used widely in aircraft, car and so on. However, DC output voltage ripple of PMSG are large in traditional direct torque control (DTC). The output voltage ripple is mainly due to large torque ripple generator. To reduce the ripple, a novel direct q-axis flux linkage control method is proposed. This method selects the optimized...
This paper presents a high performance torque control of Permanent Magnet Synchronous Motors using a real time simulator with a Finite Element Analysis (FEA) based motor model. This model can simulate some behaviors of the actual motor includes nonlinear characteristics such as spatial harmonics and magnet saturations. Therefore, a model based control developed with FEA based motor model takes some...
When direct torque control (DTC) is applied to permanent magnet synchronous motor (PMSM) drives, the relationship between the torque and stator flux linkage is important for high-efficiency drives because DTC requires them as references. In the stator flux linkage synchronous frame (M-T frame), the torque equation is described as a simple equation using the T-axis current. However, the M-axis current...
This paper presents high performance control techniques of permanent magnet synchronous motor by using a real-time simulator with a finite element analysis based motor model. These techniques enable to consider nonlinear characteristics of PMSM in motor drives because FEA based motor model can takes into account of spatial harmonics and magnetic saturation. Therefore, these techniques take some advantages...
This paper proposes a mechanical sensorless drive system based on direct torque control for permanent magnet synchronous motor. In the proposed system, the whole control system works in a rotating reference frame that is synchronized with the stator flux linkage vector. The armature voltage in the stationary reference frame does not required for the flux estimation. In addition, the proposed system...
Direct Torque Control (DTC) of brush less DC (BLDC) motor having trapezoidal back emf with a reduced torque ripple is presented in this paper. Unlike conventional six step PWM technique, a quasi square wave current is obtained by selecting the voltage vectors from the pre defined switching table, which results in faster torque response compared to the conventional scheme. In the constant torque region...
This paper presents an improved direct torque control (DTC) method for permanent magnet synchronous motors. The proposed DTC method generates the diver signal with SVPWM for the fixed switching frequency and low torque ripple relative to conventional hysteresis controllers. Different with the popular SVM-DTC, the proposed method obtains amplitude and angle of reference voltage vector directly by the...
During the past five years, flux-switching permanent magnet synchronous machines (FSPMSMs) have began to find potential applications for electric vehicle, wind generation, etc. for their high torque density, great thermal dissipation ability, strong mechanical robustness, etc. Unfortunately, FSPMSMs compared to traditional rotor-inserted PMSMs suffer greater magnetic saturation and torque ripple for...
A simplified direct torque control method is introduced in order to solve difficult situations in flux linkage observation and control of the direct torque control of brush less DC motor. This simplified direct torque control adopts a simplified structure without flux linkage observation and control. To calculate torque of motor in back electromotive force shape function method is simple and effective,...
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