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直线电机在机床给进系统的常见问题

来源:http://www.jnmcd.com 发布时间:2019-06-24 浏览:
(1)发热疑问
(1) Fever Question
由于直线微型电机直接处于散热条件较差的机床内部,其初、次级绕组在停止电磁能质变换进程中所发作的热量,很简单使温度T升高;而且T的升高又将招致电机绕组阻值R增大,该时为确保驱动力输出不变,就要增大其电流I,反过来I的增大又将使T升高,然后构成恶性循环的正反应进程。又由于直线电机的绕组、铁芯就贴在机床导轨上,其成果将严峻招致机床导轨热变形。
Because the linear micro motor is directly in the machine tool with poor heat dissipation condition, the heat generated by its primary and secondary windings in the process of stopping electromagnetic energy transformation simply increases the temperature T; moreover, the increase of T will lead to the increase of the resistance R of motor windings. In order to ensure that the output of driving force remains unchanged, it is necessary to increase its current I, in turn, the increase of I will increase T, and then constitute T. The positive reaction process of vicious circle. Because the windings and iron cores of linear motors are attached to the machine tool guideways, their results will cause severe thermal deformation of the machine tool guideways.
这与旋转电机传动办法相比,一方面应用电机本身轴上的风扇即能较好地散热,另一方面旋转电机经丝杠等传动后,到机床导轨的空间距离已较远,也就不存在由此招致的热变形疑问。所以机床进给体系选用直线步进电机驱动后,处置好其散热疑问是至关重要的一步。
Compared with the transmission method of rotary motor, on the one hand, the fan on the axis of the motor itself can better heat dissipation, on the other hand, the space distance between the rotary motor and the machine tool guide has been far after the transmission of the screw, so there is no question of thermal deformation caused by this. So it is very important to deal with the problem of heat dissipation when linear stepping motor is used in machine tool feed system.
(2)隔磁及防护疑问
(2) Questions about magnetic insulation and protection
由于旋转电机磁场是封锁式的,而直线电机磁场是敞开式的,而且就在机床作业台左近,其工件、切屑和东西等磁性资料很简单被该磁场吸住,而障碍其正常作业。为此,虽然选用电磁式要比永磁式好一点,但其隔磁防护仍不能无视。而且还需考虑对机床冷却液、光滑油等的防护。
Because the magnetic field of rotary motor is blocked, and the magnetic field of linear motor is open, and it is near the machine tool table, the magnetic data of workpiece, chip and east-west are simply absorbed by the magnetic field, which hinders its normal operation. Therefore, although the electromagnetic type is better than the permanent magnet type, its magnetic insulation protection can not be ignored. It also needs to consider the protection of machine tool coolant, smooth oil and so on.、山东自动门电机
(3)负载烦扰疑问
(3) Load Disturbance Question
直线电机传动操控只能是全闭环操控。其作业台负载(工件重量、切削力等)的改动,对一个安稳体系来说即是外界烦扰,若自动调理欠好就会招致体系震荡而失稳。
Linear motor drive control can only be fully closed-loop control. The change of worktable load (workpiece weight, cutting force, etc.) is external disturbance for a stable system. If the automatic adjustment is not good, the system will be shaken and unstable.
因此对整个直线进给驱动体系来讲,除了请求直线电机有较强的带负载才干外,还有必要一同具有速度、方位检测负反应,和高速信息传输、校正、照应才干。而且也应尽量减小导轨间的抵触阻尼,如选用翻腾导轨或磁垫悬浮导轨。另外在加大直线电机容量的一同,若恰当添加作业台自重,对减小其负载烦扰系数会有一定效果。
Therefore, for the whole linear feed drive system, besides requesting the linear motor to have strong ability with load, it is necessary to have the negative reaction of speed and azimuth detection together, and the ability of high-speed information transmission, correction and reference. It is also necessary to minimize the friction damping between the guideways, such as the choice of flip guides or magnetic cushion suspension guides. In addition, in the same way of increasing the capacity of linear motors, if the worktable weight is properly added, the load disturbance coefficient will be reduced to a certain extent.
(4)笔直进给中的自重疑问
(4) Question of Self-respect in Straight Forward Feeding
当直线步进电机应用于笔直进给组织时,由于存在拖板自重,因此有必要处置好直线电机断电时的自锁疑问和通电作业时重力加速度对其影响疑问。为此,除了添加适合的均衡配重块(或用液压支承),断电时采用机械自锁设备外,还有必要在伺服驱动操控模块上采用相应的措施。
When the linear stepping motor is used in the straight feeding organization, it is necessary to deal with the self-locking question when the linear motor is powered off and the influence of gravity acceleration on it when the power is on. For this reason, besides adding suitable balancing weight block (or hydraulic support) and using mechanical self-locking equipment when power is cut off, it is necessary to adopt corresponding measures on servo drive control module.
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