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A new method for selecting the cost-optimal components of a forward feed drive system is proposed which takes the dynamic behavior of components into account. Therefore, the practical approved method of Doyle's H∞-control optimization is transferred and extended for discrete optimization of components. Inputs are component catalogues (here: motors, gearboxes, ball screw drives) with prices and their...
This paper analyses a torque control structure for load machine used as a dynamometer. Typical area of the use is a mimicking of a mechanical load behaviour in case the mechanical load is not available. Instead of that, the mechanical load is emulated by the load machine with specific torque control. This approach belongs to dynamic emulation of mechanical load methods. Reference torque calculation...
This article considers the ability of large asynchronous machines optimal selection for assigned types of load characteristics by automated self-running time calculation when power grid voltage abnormal decrease takes place.
This paper proposes high back-drivable pseudo I-PD torque control using load-side torque observer with torsion torque sensor. According to previous research, the back-drivability of torsion torque control using torsion torque sensor depends on load-side friction. Therefore, the authors focus on load-side torque control. Load-side torque is estimated using load-side torque observer because load-side...
In the past 20 years, control methods for two-inertia systems have changed from semi-closed control to full-closed control in order to achieve higher precision positioning. Though there is a trend toward the expansion of the use of load-side encoders in the industry, we can hardly say that control methods using load-side information are sufficiently studied. Therefore, our research group has proposed...
The structure and working principle of quartz flexible accelerometer was analyzed, a stress analysis on the accelerometer beam was made according to the principle of mechanics. A structure design for the pendulum reed of accelerometer was developed in accordance with the small-range and high precision requirements. The basic structure parameters of the accelerometer were determined. ANSYS software...
Electric Variable Transmission (EVT), as a new kind of electromechanical energy converter, can be used in hybrid electric power train to make the engine operate efficiently by decoupling the engine speed from the wheels. To further study and develop control strategies of EVT based HEV on the test bench, real driving environment is required. For this purpose, this thesis designs a dSPACE based hardware-in-the-loop...
This paper is concerned with speed tracking control problem for permanent-magnet synchronous drives (PMSM) in the presence of an variable load torque and unknown model parameters. The disturbance of speed control caused by inaccuracy of model parameters has been investigated. A load torque observer has been proposed to observe the load torque and estimate the disturbance caused by inaccuracy of model...
This paper addresses the important topic of joint flexibility identification. Three dynamic models depending on measurements availability are compared. The parameters are estimated by using the ordinary least squares of an over linear system obtained from the sampling of the dynamic model along a closed loop tracking trajectory. An experimental setup exhibits the experimental identification results.
Recently, real-world haptics has been researched for tele-operation system. Conventional bilateral control can achieved corresponding master and slave position and action-reaction law. However, if system has flexible mechanism, performance of conventional bilateral control is degraded. Firstly, vibration occurs at slave load side by its flexibility. Secondly, an error between motor position and position...
This paper presents a field-weakening control method for V/Ɠ-controlled hoist drives. The method is based on the power limitation, which enables a load-dependent maximum speed without load measurement. In order to avoid the pull-out point of the hoist motor, the acceleration is halted if the motor input power exceeds a predefined limit. In addition, an integral (I) controller is used to reduce the...
A filter for trajectories smoothing is presented. The filter provides an output reproducing the input trajectory if this is compliant with given constraints on the velocity, the acceleration and the torque required for tracking it. Otherwise, the filter approximates the input profile guaranteeing that the output trajectory satisfies all the kinematic and dynamic limits. The tracking of the input signal...
Elastically coupled multi-mass systems are found in many industrial applications, like wind energy plants or in robotics. Dynamic load changes often cause peaks in the shaft torsion torque and result in damages to the system. This paper presents a control strategy to reduce the dynamic loads on the drive train and the stress in wind turbines and other multi-mass systems, by directly controlling and...
We present the system design for a novel robotic balance simulator that enables the investigation of the balance mechanisms involved in natural human standing. Our system allows for complete control of task dynamics to mimic normal standing while avoiding the pitfalls associated with applying external perturbations. The system enables subjects to balance themselves according to a programmable physical...
This paper presents a method to identify the elevator load torque when the brake is released. With the friction model, the identification process is converted to a searching question. The principle of the method is illustrated in detail, and the factors that influence the identification process and sliding distance are also analysed. Finally, the proposed method is implemented and verified by the...
This paper analyzes the example of a belt conveyor on coal harbor, and adopts the newly popular Simulink simulation software based Matlab language. This software provides a new solution for system simulation technology, and not only improves the efficiency of computer programming, but greatly enhances programming equality and reliability. The jointly working scope of driving device can be attained...
The basic requirement for studying starting analysis of Induction motor are the starting current of Induction motor and the voltage flicker during start up. This paper will summarize several common methods and provide application guidelines for proper selection of starting devices. Starting method reviewed will include different types of starters, comparative study of results obtained in laboratory...
Uninterruptible motor drives (UMDs) are essential in critical applications, such as pumping stations, conveyor systems, medical apparatus, etc. Thanks to their good specific power characteristics, flywheels as energy storage mediums can be used as short-term energy storage not only in uninterruptible power supplies (UPSs)and UMDs, but in many other applications, vehicular storage and power management...
For the speed sensor-less control in the ultra lower speed range, the mechanical simulator method is applied to cope with the problems due to the extremely lower induced voltage. In the method, however, the mechanical parameterspsila error, such as the error of the inertia, affects the starting performance. To reveal the conditions for the stable starting, we carry out the phase plane analysis under...
This paper presents an architecture to support fast prototyping of augmented reality systems, based on virtual reality. The architecture defines simulation services separated from other aspects of the system. These services support incremental evolution of simulated prototypes into nonsimulated systems. Focus is also placed on user interaction,through the definition of an interaction architecture...
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