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In this paper, consider the effect of the load inertia fluctuation for surface-mounted permanent magnet synchronous motor (SPMSM), the problem of dynamic response of SPMSM is studied. A backstepping control algorithm based on disturbance observer (DO) is proposed. Firstly, according to the equation of motor speed, the minimum-order observer is established to observe the disturbance value of load inertia,...
Permanent Magnet Synchronous Motor (PMSM) as the key component of the Electric Vehicles (EVs), has numerous advantages over other synchronous motors. Fault diagnosis is essential to guarantee the safety and continuity of the operation for EVs. An undetected fault in the PMS M system may lead to high repair cost, or even catastrophic failure. Among lots of faults in the PMSM, the most serious are short...
Precise fault diagnosis of the pitch system in wind turbines is essential and is of practical significance for evaluating it by the usage of the SCADA (Supervisory Control And Data Acquisition) system. Firstly, the fault mechanism of the pitch system is investigated, including the source classification of the faults, and their direct connections with the SCADA data. Secondly, state feature extraction...
In this paper, the tracking control for a mechanical system with friction and backlash is considered. Friction and backlash nonlinearities often act on the main obstacles for high precision control. Based on the LuGre friction model and the Backlash model, a robust adaptive control algorithm is developed to compensate for friction and backlash nonlinearities by using backstepping design techniques...
This paper proposes a new joint mechanism for a snake-like robot to travel in hazardous areas for rescue tasks. In a complex environment, it is necessary to preform an efficient three-dimensional motion. But, a serial snake-like robot could hardly do that because of the limitation of its 1-DOF joint structure. To meet the requirement of flexible locomotion, a parallel mechanism was proposed which...
With the developments of robotics, more and more rehabilitation robots are used to assist traditional training in rehabilitation field. In this paper, a novel ankle robot combined with 3 degrees of freedom, full fill passive-active training, subjective awareness and objective training requirements was proposed. The requirement of ankle robot was analyzed based on the ankle physical structure and real...
With the development of aging society, the number of hemiplegia patients grows rapidly and over 75% of survivors suffering hemiplegia need rehabilitation training. To assist therapists, series of rehabilitation training robots were carried out. However, most of current researches are only focusing on function training. They ignore the importance of neurological rehabilitation in early phrase of hemiplegia...
Since the intricate and dangerous working environment of steam generator, it's risk for workers to complete fastening bolts of blocking plate. The paper introduces a fastening bolt method based on image recognition. The mechanical structure and control system were proposed gradually to be a carrier for the method. Then the image recognition adapted the Canny algorithm to realize the image binaryzation...
A precision positioning servo system for micro machining tools is designed to fit the needs of practical application in domestic and abroad marker. The construction of the servo system ensures the microscale machine tool has a hard-material machining capability with characteristics of compact size, high precision, ample force output. The compact size and ample force output are achieved by using short-lead...
A positioning system is established and tested for meso machine tools. The design aims to develop practical microscale machine tools, improve the capability in difficult-to-machine material processing, resolve the contradiction between small size and high torque output. In order to maintain a mini volume and in terms of nowadays technology, ball screw driven by AC motor is the only way to achieve...
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