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全自动高速低温离心机速控电路的设计
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作者 杨栋 李锦一 《设备管理与维修》 1990年第4期40-41,共2页
目前,中高档高速低温离心机的速控电路普遍采用手动分档或无级调速并行的结构。这种结构很容易使触点机械磨损和氧化,并且每次启动前首先都需人工置速度零位,然后逐档分时人工调整加速。若启动前不置零位或启动后短时间内调速过高,则电... 目前,中高档高速低温离心机的速控电路普遍采用手动分档或无级调速并行的结构。这种结构很容易使触点机械磨损和氧化,并且每次启动前首先都需人工置速度零位,然后逐档分时人工调整加速。若启动前不置零位或启动后短时间内调速过高,则电机启动和加速力矩太小,使电机不能启动或启动后速度响应不上去,容易烧坏电机。总之,采用这种调速结构故障率高、操作麻烦。 展开更多
关键词 离心机 速控电路 设计
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Vibration Analysis and Direct Control of XY Table Automated Assembly Machines
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作者 Charfeddine Mrad 《Journal of Mechanics Engineering and Automation》 2013年第1期7-13,共7页
XY table automated assembly machines ensure time saving and quality improving in the electronics industry. Recently, due to the need of higher operation speeds and lighter machines in PCB (Printed Circuit Board) ass... XY table automated assembly machines ensure time saving and quality improving in the electronics industry. Recently, due to the need of higher operation speeds and lighter machines in PCB (Printed Circuit Board) assembly, a challenging problem has arisen which is the table positioning vibration. The high speed with the machine flexibility, make the positioning vibration inevitable although the inner control. The positioning vibration is to be reduced otherwise the machine becomes useless. Firstly, the machine is modeled, the positioning vibration is formulated, and then analyzed. Secondly, using the analysis, three direct control methods are identified to decrease the positioning vibration, they are based on the kinematics, dynamics, and operation of the machine. Thirdly, the methods are examined numerically to evaluate their efficiency. Lastly, the identified methods are discussed to conclude on their application. The results are a real contribution in the vibration control of XY table automated assembly machines, which is classified as industrial knowhow. 展开更多
关键词 Assembly machines XY table positioningvibration vibration analysis direct control.
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