共查询到20条相似文献，搜索用时 15 毫秒
1.
The DSC （direct self control） of speed regulation technology was applied to drive a motor running at a certain overloading ratio in intermittent working conditions. To control motor temperatures rising effectively, a finite element method with an iterative approach was applied to simulate real working conditions and analyze the temperature rising of the inner part of the motor. Application of DSC speed regulation realizes the invariable torque output quickly and avoids the peak current at the start state in favor of the motor temperature decreasing. Based on an analysis with the finite limit method, some effective measures were taken to improve the ability of the motor to expel heat. The overload ability of the motor was improved and the stable motor temperature rising was obtained, fulfilling the demands of electrical screw presses. 相似文献
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To elucidate the principles of notable torque and flux ripple during the steady state of the conventional direct torque control (DTC) of induction machines, the factors of influence torque variation are examined. A new torque ripple minimization algorithm is proposed. The novel method eradicated the torque ripple by imposing the required stator voltage vector in each control cycle. The M and T axial components of the stator voltage are accomplished by measuring the stator flux error and the expected incremental value of the torque at every sampling time. The maximum angle rotation allowed is obtained. Experimental results showed that the proposed method combined with the space vector pulse width modulation(SVPWM) could be implemented in most existing digital drive controllers, offering high performance in both steady and transient states of the induction drives at full speed range. The result of the present work imphes that torque fluctuation could be eliminated by imposing proper stator voltage, and the proposed scheme could not only maintain constant switching frequency for the inverter, but also solve the heating problem and current harmonics in traditional induction motor drives. 相似文献
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针对异步电动机直接转矩控制（DTC）系统在低速时由于开关频率不稳定而引起转矩脉动较大的缺点，提出了一种预测控制方法。该方法根据转矩和定子磁链的误差来确定应该施加的参考电压矢量，最后利用空间矢量脉宽调制（SVPWM）方法来合成该矢量，这样即保证了逆变器的开关频率恒定，从而大大降低转矩脉动。仿真结果表明，在低速下定子磁链轨迹近似为圆，转矩脉动不明显。 相似文献
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This paper presents an investigation of inverter fault-tolerant operation for a permanent magnet synchronous motor （PMSM） direct torque control （DTC） system under various inverter faults. The performance of a faulty standard 6-switch inverter driven PMSM DTC system is analyzed. To avoid the loss or even disaster caused by the inverter faults, a topology-modified inverter with fault-tolerant capability is introduced, which is reconfigured as a 3-phase 4-switch inverter. The modeling of the 4-switch inverter is then analyzed and a novel DTC strategy with a unique nonlinear perpendicular flux observer and feedback compensation scheme is proposed for obtaining a continuous, disturbance-flee drive system. The simulation and experimental results demonstrate that the proposed inverter fault-tolerant PMSM DTC system is able to operate stably and continuously with acceptable static and pretty good dynamic performance. 相似文献
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异步电机按定子磁链定向的转矩连续控制 总被引：5，自引：0，他引：5
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研究了异步电机直接转矩控制的方法,利用MATLAB／SIMULINK仿真工具对直接转矩控制系统进行了建模和仿真．结果表明：直接转矩控制具有鲁棒性强、转矩动态响应速度快等优点． 相似文献
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徐石交 《岳阳职业技术学院学报》2008,23(2):68-71
本文提出了一种基于数字信号处理器(TMS320F240)的异步交流电机直接转矩控制系统.通过研究异步电机直接转矩控制原理.给出了系统硬件框图;最后对系统进行了实验.实验结果表明系统能够实现电机快速动态响应这一特征且在交流调速中具有一定的实用价值. 相似文献
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研究目的：四轮独立驱动汽车四个车轮的电机转矩可以正、反向输出,有必要对其底盘集成控制系统进行针对性设计以保证各车轮间的协调运作。集成控制系统一般可以分为上层运动控制器和下层力分配器。对于运动控制器的设计,同类研究一般采用滑模控制方法来处理汽车运动的非线性特征,其中终端滑模控制因具有高的稳态精度和有限时间收敛的特点而成为研究热点。对于力分配器的设计,通常方法不能在保证运算效率的同时考虑到执行器的约束,从而很难应用于实际。本文采用终端滑模控制方法来设计运动控制器,通过分析驾驶员操作行为从而更好地追踪理想的车辆运动目标;并提出一种简单有效的转矩分配控制策略,通过考虑轮胎附着极限从而将运动总力分配至四个车轮上。创新要点：本文创新性地将终端滑模控制应用到底盘集成控制系统以实现车辆纵向、侧向及横摆运动的联合控制;本文提出了一种新颖的转矩分配控制策略,将复杂的有约束控制分配问题分解至若干个简单的无约束分配子问题。研究方法：本文采用分层式协调控制方案（图1）,应用非奇异和全局快速终端滑模控制方法设计运动控制器,提出一种基于伪逆矩阵的有约束转矩分配策略,应用驾驶员最优预瞄加速度模型来描述和分析人-车闭环系统的运动响应,通过MATLAB/Simulink和CarSim的联合仿真对所设计的四轮独立驱动汽车转矩分配方法进行对比验证。所设定的三个仿真工况包括：开环方向盘角阶跃输入（图6、7及表2）、闭环双移线工况（图8–10）和闭环对开路面制动（图11–15）,分别用以测试车辆横摆、侧向及纵向方向上的动力学响应。重要结论：本文提出的基于终端滑模控制的四轮独立驱动汽车转矩分配方法将车辆的稳态转向特性由不足转向转变为中性转向,驾驶员从而? 相似文献
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高速定位系统中,电机工作在力矩控制模式下不但克服了位置模式下的低响应特性,又克服了速度模式下调试PID参数耗时长,难以获得最佳效果的不足,通过引入和实施改进的PID和加速度前馈等高级控制算法,能给控制系统带来更好的高速、高精度响应特性。 相似文献
11.
何跃军 《深圳职业技术学院学报》2014,(1):11-15
介绍了一种电机驱动控制器的设计方案．该控制器控制对象为功率在1～5kW范围内的无刷电动机,适用于多种中型电动车的驱动控制．与采用传统的直流电机或异步电机驱动控制器相比,本驱动控制器采用无刷电机作为驱动电机,具有能流密度高、使用寿命长、调速范围宽、维护成本低等优点．驱动控制器采用正弦波空间矢量控制（SVPWM）策略,既保留有同步电机矢量控制策略的动力性能好、转矩脉动低等优点,又省略了矢量控制所必须需的转子编码器,因而控制方式更为简洁、可靠,且成本低．驱动控制器以Microchip公司的DSPIC33FJ32MC204控制芯片作为控制核心,使用大功率MOSFET作为开关管,分立式驱动电路驱动,具有驱动信号硬件互锁、过流、欠压、过压、过热等多重保护功能． 相似文献
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WANG Wei JIN Ruo-jun JIANG Jing-ping 《浙江大学学报(A卷英文版)》2007,8(12):1889-1893
This paper develops a unified methodology for a real-time speed control of brushless direct-current motor drive systems in the presence of measurement noise and load torque disturbance. First, the mathematical model and hardware structure of system is established. Next, an optimal state feed back controller using the Kalman filter state estimation technique is derived. This is followed by an adaptive control algorithm to compensate for the effects of noise and disturbance. Those two algorithms working together can provide a very-high-speed regulation and dynamic response over a wide range of operating conditions. Simulated responses are presented to highlight the effectiveness of the proposed control strategy. 相似文献
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In order to deal with torque pulsation problem caused by traditional control method for brushless DC （BLDC） motor and to achieve high precision and good stability, a novel control strategy is proposed. Compared with the traditional control scheme, by using phase voltage as a control objective and making waveform of phase current approximately quasi-sinusoidal, torque ripple of BLDC motor is reduced from the original 14% to 3.4%, while toque is increased by 3.8%. Furthermore, by detecting zero-crossings of back electromotive force （BEMF） with non-conducting phases, sensorless control is realized. The new control strategy is simple. It can minimize torque ripple, increase torque, and realize sensorless control for BLDC motor. Simulation and experiments show good performance of BLDC motor by using the new control method. 相似文献
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For a single-motor parallel hybrid electric vehicle, during mode transitions （especially the transition from electric drive mode to engine/parallel drive mode, which requires the clutch engagement）, the drivability of the vehicle will be signifi- cantly affected by a clutch torque induced disturbance, driveline oscillations and jerks which can occur without adequate controls. To improve vehicle drivability during mode transitions for a single-motor parallel hybrid electric vehicle, two controllers are proposed. The first controller is the engine-side controller for engine cranking/starting and speed synchronization. The second controller is the motor-side controller for achieving a smooth mode transition with reduced driveline oscillations and jerks under the clutch torque induced disturbance and system uncertainties. The controllers are all composed of a feed-forward control and a robust feedback control. The robust controllers are designed by using the mu synthesis method. In the design process, control- oriented system models that take account of various parameter uncertainties and un-modeled dynamics are used. The results of the simulation demonstrate the effectiveness of the proposed control algorithms. 相似文献
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乔维德 《宁波职业技术学院学报》2010,14(5):8-12
针对常规模糊控制器在永磁同步电机直接转矩控制中超调量大、响应慢、脉动大等问题,提出一种基于遗传算法的模糊自适应PI控制器的速度调节器设计方案,结合遗传算法与模糊PI控制,应用遗传算法优化模糊自适应PI控制器的模糊控制规则和量化因子ke、kec及比例因子kuP、kuI,以确保永磁同步电机直接转矩控制系统响应具有最优的动态响应和稳态性能。仿真与试验结果表明,与传统模糊PI控制相比,该设计方法具有适应性强、动态响应好、鲁棒性强等优点,取得了比较满意的控制效果。 相似文献
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徐君鹏 《河南科技学院学报》2007,35(3):62-65
Fuzzy systems are currently being used in a wide field of industrial and scientific applications. Since the design and especially the optimization process of fuzzy systems can be very time consuming, it is convenient to have algorithms which construct and optimize them automatically. In order to improve the system stability and raise the response speed, a new control scheme, direct - torque neuro - fuzzy control for induction motor drive, was put forward. The design and tuning procedure have been described. Also, the improved stator flux estimation algorithm, which guarantees eccentric estimated flux has been proposed. 相似文献
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针对直流力矩的闭环调速控制,提出一种渐近调速算法,主要解决调速过程的快速、平稳、精确控制问题.介绍算法,并给出实现这一算法的技术方案.方案以数字信号处理器为核心,与集成马达控制器和锁相倍频测速单元共同组成闭环随动控制系统.给出驱动控制通道设计和速度反馈通道设计,并对测速单元的测量方法做出精度分析. 相似文献
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乔维德 《金华职业技术学院学报》2010,10(3):28-32
针对感应电机直接转矩控制中存在较大转矩脉动的特点,提出基于神经网络与模糊逻辑的感应电机直接转矩控制策略,用训练好的神经网络建立定子磁链观测器,将模糊控制算法引入逆变器状态开关选择器,通过对转矩误差、定子磁链误差和磁链位置角的模糊分级来实现逆变器开关的分级控制。仿真及实验结果表明,与常规DTC相比,该控制方法转矩、转速、磁链响应速度快、响应脉动小,具有良好的稳态跟踪性能和优异的动态响应。 相似文献
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乔维德 《江西电力职业技术学院学报》2009,22(4)
为简化无刷直流电机控制系统结构的同时又能使其具有较快的转矩响应速度,提出一种适用于无刷直流电机直接转矩控制的神经网络模糊推理控制方案,用神经网络定子磁链观测器取代传统的定子磁链观测器,采用模糊控制算法设计逆变器开关状态选择器。利用MATLAB对系统两种不同控制方法的仿真实验结果进行比较,通过比较得出,本文的控制方法转矩、转速、磁链响应快、脉动小,具有优良的稳定跟踪性能和较快的动态响应,具有一定的工程研究价值。 相似文献
20.
电机定子电阻的变化影响了直接转矩控制系统的低速性能.定子电阻的变化具有非线性、时变性等特点,难以建立精确的数学模型,因此提出了基于小波神经网络的定子电阻线辨识的方案,该网络采用梯度下降算法训练,可用于对定子电阻进行在线的辨识.仿真实验测试结果表明该辨识器能够精确辨识定子电阻值,从而有效地改善了直接转矩控制系统的低速性能. 相似文献