共查询到20条相似文献,搜索用时 156 毫秒
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针对数控机床要达到高速高精度切削的要求,在实际加工应用中,常需在有限行程中作连续性的周期运动,这就要求对周期性轨迹具有跟踪能力和对周期性扰动具有抑制能力。永磁直线同步电机(PMLSM)高速、高响应和直接驱动等优点,使之在高档数控机床中广泛地应用。直线伺服控制系统的基本要求是控制器的设计应有调节能力,分析直线电机伺服控制系统的周期运动特性,设计了基于重复控制器PMLSM伺服系统,以消除周期性参考输入的稳态跟踪误差,实现周期性输入信号的精确跟踪和对周期性扰动的有效抑制。仿真结果表明所提出的控制方案是有效的,提高了系统跟踪精度。 相似文献
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以中凸变椭圆活塞为例,研究了非圆截面零件的车削加工成形原理,在分析了加工过程中对刀具进给的要求的基础上,设计了以音圈直线电机直接驱动刀具的伺服进给系统,并实现了高速往复运动控制,最后在搭建的试验平台上模拟加工椭圆横截面,试验结果验证这套进给系统方案是可行的. 相似文献
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介绍了一种航空放油阀用混合式直线步进电动机驱动控制系统。分析了电机的工作原理,并对电机的末端冲击、平稳运行等关键技术进行了研究,给出了单片机及其细分控制电路和末端降速控制方法。试验结果表明:该电机可作为直线阀门的直接驱动部件。 相似文献
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基于自适应变结构永磁直线电机直接推力速度控制 总被引:1,自引:1,他引:0
针对永磁直线电机参数变化和外部扰动对伺服性能的影响,提出自适应变结构直接推力速度控制设计方法.由推力、磁链误差的积分函数建立滑模面,实际应用中存在的参数变化及负载扰动等不确定因素由自适应率修正.经分析验证,与经典直接推力控制相比,自适应变结构直接推力速度控制算法明显减少了由于系统参数变化和外部扰动引起的速度的推力脉动,能快速准确地跟踪给定指令,在保证系统稳定情况下增强了鲁棒性. 相似文献
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应用于直线电机的平滑切换模糊PID控制方法 总被引:5,自引:4,他引:5
为了适应直线电机的快速动态特性,抑制由于直接驱动使参数摄动和负载扰动等不确定因素对伺服特性的影响,提出了一种新的平滑函数模型,设计了平滑切换式模糊PID复合控制器,并应用于直线电机位置伺服控制。通过模糊控制提高伺服系统的动态性能,用PID控制保证系统的稳态性能,利用平滑函数改善控制切换过程。在PRS-XY型混联机床上的应用表明,该控制算法明显提高了伺服系统的动态性能,减小了位置跟随误差,对非线性扰动因素具有良好的适应性。 相似文献
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A high-performance ac motor control has been developed by employing the vector control concept. Its versatility has been proven through the six years of experience in applications to pinch roll drives of continuous casting plants, machine tool spindle drives, and other drive systems in industry. Equivalent torque characteristics are achieved with ac motors compared to dc motors without direct detection of the magnetic flux. The effect of rotor temperature on the torque characteristics has been compensated to a satisfactory level in actual industrial use by various means. Servo drives, both synchronous motor and induction motor types, have been introduced. The test results show that the performance of ac servo drives is equivalent or superior to that of the PWM-controlled dc servo drives. Furthermore, an example of the direct-drive servo is described, where an ultra-low speed high-torque motor and an ultra-high resolution position sensor play key roles. In addition, the possibility of a more sophisticated servo drive exploiting modern control theory is suggested. 相似文献
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Güngör Bal Erdal Bekiroglu Ramazan Bayindir Hasan Uzel 《Journal of Electroceramics》2008,20(3-4):265-270
Piezoelectric driven ultrasonic motors have been attracted as considerable actuators for the servo speed and position applications
in recent years. These motors have important features and advantages to be preferred in the special movement applications.
Ultrasonic motors have different operating principles and different drive and control systems than the electromagnetic motors.
In this study, microcontroller based digitally controlled drive system has been proposed for a travelling-wave ultrasonic
motor. Drive system includes power circuit, interface electronics circuits and microcontroller parts. Power circuit is combined
from half-bridge serial-resonance inverter to provide highfrequency two-phase voltages. Interface circuits include gate drive,
direction control, opto-coupler and filter circuits. Microcontroller is programmed to generate required digital control signals
for overall control of the motor. Related to the reference speed, the microcontroller generates control signal resulting proper
driving frequency. Consequently, the actual motor speed tracks the reference speed precisely. The speed feedback is taken
from optical encoder and transmitted to the controller as digital speed and position signals. The developed drive system has
been tested experimentally. The obtained results show the effectiveness and reliability of the proposed system. The microcontroller
based drive system can be applied easily and successfully to the ultrasonic motor. 相似文献
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针对永磁直线同步电机(PMLSM)直接驱动伺服系统易受负载扰动、测量噪声及参数变化影响的特点,基于H¥/m方法设计了一个鲁棒二自由度速度控制器,解决了传统单自由度控制器在满足系统跟踪性能和抗干扰性能要求方面存在的矛盾。由于在求解m控制器时应用了标准H¥控制理论,大大提高了m控制器的获得速度。该速度控制器克服了标准H¥控制器保守性的缺点,并且对负载扰动、测量噪声和参数不确定性等干扰的抑制方面也比标准H¥控制器更具鲁棒性。仿真结果及分析表明,所提基于H¥/m方法二自由度速度控制器,满足高精度永磁直线同步电机伺服系统对鲁棒性和快速性的要求。 相似文献
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录像机用伺服电机驱动电路是录像机伺服系统设计中的重要部分.介绍了录像机伺服系统中鼓电机驱动电路、主导轴电机驱动电路设计中使用的专用IC的型号、主要技术特点及应用方法,为录像机伺服系统中电机驱动电路的设计提供了有价值的解决方案. 相似文献
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可顺序控制多台电机的伺服驱动方法 总被引:1,自引:0,他引:1
针对现有伺服驱动器在某些场合应用的不足,设计了一种可顺序控制多台电机的伺服驱动方法,该驱动方法可用于不需轨迹控制的自动控制机械中,利用这种驱动方法可极大地降低系统成本,并具有工作可靠,加工精度高等优点。 相似文献
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ABSTRACT Permanent magnet brushless dc (PMBLDC) motors are increasingly being used in a wide range of applications such as machine tools, robotics and high precision servo applications. A comprehensive analysis which includes modeling and simulation of PMBLDC motor drive is presented in this paper. A mathematical model of the drive is developed with a view to studying the transient response of current controlled voltage source inverter (VSI) fed PMBLDC motor. The drive system consists of discrete PID(Proportional, integral plus derivative) speed controller, the reference current generator, the position sensor, an inverter and the motor. Each part of the drive system is modeled separately and then integrated to study the dynamic behavior of the drive system. The study also examines the effectiveness of the drive system during starting, load perturbation, speed reversal and dc link voltage fluctuation. 相似文献