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Induction motors have been intensively utilized in industrial applications, mainly due to their efficiency and reliability. It is necessary that these machines work all time with its superior and unwavering quality. So, In this paper direct torque control (DTC) of three phase induction motor drives is presented because this method is embraced as an approximate control method in drive system especially...
The paper describes the direct torque control of the switched reluctance motor drives. A new engineering way for reducing electromagnetic torque ripples in the switched reluctance motor drives was shown. For this purpose, the constructed 3D model which was formed using the Kompas 3D program is presented in the paper. The results of the optimization and simulation using Matlab/Simulink are given.
Design of switched reluctance motor (SRM) with emphases on torque ripple suppression and current reduction is researched in this paper. The motor is operated with direct torque control (DTC) to obtain a good torque control performance. Since motor design and motor control are two important aspects of the motor drive system, to achieve a better performance of the whole system, they should not be treated...
In this paper, a novel hybrid DTC scheme is proposed for asymmetric six-phase PMSM drives, which can achieve faster dynamic response of classical ST-DTC scheme and good steady-state performance of classical SVM-DTC scheme. The key is that a completely novel control strategy for torque and stator flux is designed. Different torque control methods are adopted under dynamic mode and steady-state mode...
The well-known maximum torque per ampere (MTPA) strategy is usually integrated the field oriented control (FOC) to improve the efficiency of interior permanent-magnet (IPM) synchronous motor drives. As an alternative to the FOC, direct torque control (DTC) has attracted extensive attention from both academia and industry in the last few decades, due to its distinctive advantages, e.g., fast dynamic...
Conventional single-vector-based direct torque control (SVB-DTC) has been widely researched owing to its simple control structure, parameter robustness and fast response. However, the SVB-DTC often features large torque and flux ripple. To suppress the large ripple in torque and stator flux, recently, a duty-cycle-based DTC (DCB-DTC) scheme applying a zero vector and a nonzero vector to the drive...
This paper deals with the sensorless direct torque control (DTC) scheme for the permanent magnet synchronous motor (PMSM), where a new estimation algorithm is developed based on the polynomial chaos theory and the extended Kalman filter (EKF) for the sensorless obtaining of the rotor speed, stator flux and electromagnetic torque. The proposed estimator can effectively deal with parametric uncertainties...
Direct torque control using space vector modulation (DTC-SVM) is one of the most popular control methods of induction motor for electric vehicle (eV). This paper proposes DTC-SVM with improved deadbeat control. During uphill and downhill, instant torque changes is problem for drivers. The principle of the developed method is a solution to overcome the torque need on unexpected road conditions. In...
High performance drives with induction machines require use of vector control. The direct torque control and field oriented control are nowadays two most applied vector control methods. The main advantage of the method for direct torque control of induction machines is its simplicity and therefore its robustness. Namely, control variables (the electromagnetic torque and stator flux vector) are estimated...
A new sensorless direct torque control method for PM-Assisted synchronous motor drives is proposed in this paper. The stator flux linkage amplitude and electromagnetic torque are the two controlled variables which are regulated in stator flux frame. Unlike the two most conventional sensorless methods at low speeds, high frequency (HF) rotating carrier voltage injection into stationary reference frame...
This paper proposes a method for direct torque control of Brushless DC (BLDC) motors. Evaluating the trapezium of back-EMF is needed, and is done via a sliding mode observer employing just one measurement of stator current. The effect of the proposed estimation algorithm is reducing the impact of switching noise and consequently eliminating the required filter. Furthermore, to overcome the uncertainties...
In order to solve the conventional direct torque control contradiction between the dynamic and static performance, a permanent magnet synchronous motor system direct torque control architecture is proposed based on space vector modulation strategy. In this method flux and torque are controlled through stator voltage components in stator fluxlinkage coordinate axes and space vector modulation is used...
In this paper, an improved control strategy (ICS) based on the duty ratio modulation, by properly matching the positive voltage vectors with the new zero voltage vectors (ZVVs), is proposed in direct torque control (DTC) of brushless DC motor (BLDCM). The traditional voltage switching table for the six switches of the converter is modified according to this strategy to minimize the torque ripple....
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 investigates the harmonic voltage control strategy of direct torque control for five-phase induction generator (IG) system. In high/medium power applications, the generating function requires the performance of fast dynamic response, good static performance and high utilization of the dc bus voltage. For IG generating system, the direct torque control strategy has the advantages of easy...
Conventional direct torque control (DTC) achieves faster dynamic response compared to field-oriented control in permanent magnet synchronous motor drives (PMSM). However, it usually features large torque and stator flux ripple which deteriorates the steady performance of PSM drive. Various duty- based DTC schemes have been proposed to reduce torque ripple at the expense of increased complexity and...
This paper proposes a method to estimate the stator winding temperature of permanent magnet synchronous motor (PMSM) driven by direct torque control (DTC) strategy, where the stator resistance is used as a direct indicator of the temperature. In this method, the quantitative relationship between the dc current offset and the corresponding changes in torque is derived. The dc current offset is generated...
This paper presents a 12-sector control method, based on the new zero voltage vectors (ZVVs), in direct torque control (DTC) of brushless DC motor (BLDCM). The 12-sector method can apply more new ZVVs in a single control period than the 6-sector method. As the new ZVVs play a key role with respect to preventing the freewheeling current in the switch off phase, this method is better qualified to avoid...
To deal with parametric uncertainty, load disturbance together with other nonlinear factors in highspeed permanent magnet synchronous motor (PMSM) systems, an adaptive robust controller (ARC) is proposed based on direct torque control method. In the high-speed PMSM modeling process, the unknown nonlinear factors, including modeling error and uncertain disturbance, are considered. Based on the optimized...
This paper discusses operating characteristics of a permanent magnet synchronous motor (PMSM) drive system based on direct torque control (DTC). In this system, the whole control system works in a rotating reference frame that is synchronized with the stator flux linkage vector (called M-T frame). The stator flux estimation is also based on a PMSM model in the M-T frame, and thus, this is expected...
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