直流测速发电机误差及减小误差方法
实际上直流测速发电机的输出特性 并不是严格的线性特性,而与线性特性之间存在有误差。下面讨论产生误差的原因及减小误差的方法。
1.电枢反应的影响
当直流测速发电机带负载时,负载电流流经电枢,产生电枢反应的去磁作用,使电机气隙磁通减小。因此,在相同转速下,负载时电枢绕组的感应电动势比在空载时电枢绕组的感应电动势小。负载电阻越小或转速越高,电枢电流就越大,电枢反应的去磁作用越强,气隙磁通减小的越多,输出电压下降越显着。
为了减小电枢反应对输出特性的影响,应尽量使电机的气隙磁通保持不变。通常采取以下一些措施:
(1)对电磁式直流测速发电机,在定子磁极上安装补偿绕组。有时为了调节补偿的程度,还接有分流电阻。
(2)在设计电机时,选择较小的线负荷和较大的空气隙。
(3)在使用时,转速不应超过线性工作转速,所接负载电阻不应小于负载电阻。
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3、什么叫不匹配,这与碰撞理论一致,当一个物体与另一个惯量相比无穷大的物体发生碰撞时,则会发生这个物体的动量状态翻转,而惯量无穷大的物体运动状态不变,我们称此种现象为惯量不匹配;
4、所以电机的转动惯量与负载的转动惯量相等时(传动比=1),为惯量匹配;
5、如果传动比=10,那么电机的转动惯量等于负载折算到电机轴的惯量(负载惯量/100),为惯量匹配;
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一般情况下,使用没有磁性的34不锈钢废料浇注出来的铸件产品却带有微磁性。什么原因导致的呢?因为:化学成分当量成分控制没有到位。一般的生产厂家为了降低成本把Ni控制下限,8.-8.2%之间,Cr/Ni达到一定数值时钢的组织中出现一定量的铁素体,铁素体是有磁性的;此时采用15~18℃固溶处理可以把铁素体完全溶入奥氏体就不会有磁性了。冷加工硬化。当奥氏体不锈钢在冷加工时产生形变马氏体,形变马氏体使得不锈钢强度增加,而形变马氏体是有磁性的。
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SKF进口轴承润滑的方法,分为脂润滑和油润滑。为了使SKF进口轴承很好地发挥机能,首先,要选择适合使用条件、使用目的的润滑方法。若只考虑润滑,油润滑的润滑性占优势。但是脂润滑有可以简化SKF进口轴承周围结构的特长。液压泵用SKF进口轴承柱塞泵重要的部件是轴承,降低SKF进口轴承中的负压是防止水进入的基本要求,角接触轴承的载荷计算,机车轴承的给油保养十分重要,电动机SKF进口轴承为什么会过热的原因。
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