philharmonia 发表于 2007-4-19 18:39:06

卧式和立式机床,计算步进电机输出的总力矩M---[求教]

<SPAN lang=EN-US style="FONT-SIZE: 9pt; FONT-FAMILY: ??; mso-bidi-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体">
<P><BR style="mso-special-character: line-break">请问各位老师:</P>
<P>&nbsp;&nbsp; 如果数控机械滑台上的伺服电机改为步进电机,为选择步进电机,<SPAN style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-ascii-font-family: ??; mso-hansi-font-family: ??">计算电机输出的总力矩</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; FONT-FAMILY: ??; mso-bidi-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体"><FONT face="宋体, MS Song">M时(公式如下),对于卧式和立式的机床,公式代数是否一致?对于立式机床,滑台立置,由于滚珠丝杠没有自锁,Mf---<SPAN style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-ascii-font-family: ??; mso-hansi-font-family: ??">导轨摩擦折算至电机的转矩 是否为零?请老师们给予帮助.谢谢啦~~</SPAN></FONT></SPAN></P>
<P><SPAN lang=EN-US style="FONT-SIZE: 9pt; FONT-FAMILY: ??; mso-bidi-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体"><FONT face="宋体, MS Song"><SPAN style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-ascii-font-family: ??; mso-hansi-font-family: ??"><SPAN style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-ascii-font-family: ??; mso-hansi-font-family: ??">计算电机输出的总力矩</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; FONT-FAMILY: ??; mso-bidi-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体"><FONT face="宋体, MS Song">M <BR><BR>M=Ma+Mf+Mt (1-3) <BR>Ma=(Jm+Jt).n/T×1.02×10ˉ2 (1-4) <BR><BR></FONT></SPAN><SPAN style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-ascii-font-family: ??; mso-hansi-font-family: ??">式中</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; FONT-FAMILY: ??; mso-bidi-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体"><FONT face="宋体, MS Song"> <BR>Ma ---</FONT></SPAN><SPAN style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-ascii-font-family: ??; mso-hansi-font-family: ??">电机启动加速力矩</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; FONT-FAMILY: ??; mso-bidi-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体"><FONT face="宋体, MS Song">(N.m) <BR>Jm</FONT></SPAN><SPAN style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-ascii-font-family: ??; mso-hansi-font-family: ??">、</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; FONT-FAMILY: ??; mso-bidi-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体"><FONT face="宋体, MS Song">Jt---</FONT></SPAN><SPAN style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-ascii-font-family: ??; mso-hansi-font-family: ??">电机自身惯量与负载惯量</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; FONT-FAMILY: ??; mso-bidi-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体"><FONT face="宋体, MS Song">(Kg.cm.s2) <BR>n---</FONT></SPAN><SPAN style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-ascii-font-family: ??; mso-hansi-font-family: ??">电机所需达到的转速</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; FONT-FAMILY: ??; mso-bidi-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体"><FONT face="宋体, MS Song">(r/min) <BR>T---</FONT></SPAN><SPAN style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-ascii-font-family: ??; mso-hansi-font-family: ??">电机升速时间</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; FONT-FAMILY: ??; mso-bidi-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体"><FONT face="宋体, MS Song">(s) <BR><BR>Mf=(u.W.s)/(2πηi)×10ˉ2 (1-5) <BR><BR>Mf---</FONT></SPAN><SPAN style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-ascii-font-family: ??; mso-hansi-font-family: ??">导轨摩擦折算至电机的转矩</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; FONT-FAMILY: ??; mso-bidi-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体"><FONT face="宋体, MS Song">(N.m) <BR>u---</FONT></SPAN><SPAN style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-ascii-font-family: ??; mso-hansi-font-family: ??">摩擦系数</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; FONT-FAMILY: ??; mso-bidi-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体"><FONT face="宋体, MS Song"> <BR>η---</FONT></SPAN><SPAN style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-ascii-font-family: ??; mso-hansi-font-family: ??">传递效率</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; FONT-FAMILY: ??; mso-bidi-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体"><FONT face="宋体, MS Song"> <BR><BR>Mt=(Pt.s)/(2πηi)×10ˉ2 (1-6) <BR><BR>Mt---</FONT></SPAN><SPAN style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-ascii-font-family: ??; mso-hansi-font-family: ??">切削力折算至电机力矩</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; FONT-FAMILY: ??; mso-bidi-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体"><FONT face="宋体, MS Song">(N.m) <BR>Pt---</FONT></SPAN><SPAN style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-ascii-font-family: ??; mso-hansi-font-family: ??">最大切削力</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; FONT-FAMILY: ??; mso-bidi-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体"><FONT face="宋体, MS Song">(N) </FONT></SPAN></SPAN></FONT></SPAN></SPAN></P>

随风而去 发表于 2007-4-19 19:49:06

Re: 卧式和立式机床,计算步进电机输出的总力矩M---[求教]

汗颜~~~~

以前我们在这方面选型的工作都是由机械工程师算的~~~~

呵呵~~~

期待高手们解答哩~~~~

philharmonia 发表于 2007-4-19 21:32:17

Re: 卧式和立式机床,计算步进电机输出的总力矩M---[求教]

我现在在做这方面的课程设计,真棘手~~

期待老师们解答~~~~

philharmonia 发表于 2007-4-22 17:40:22

Re: 卧式和立式机床,计算步进电机输出的总力矩M---[求教]

为防止滑台下滑而安置制动器,如用制动器产生的摩擦力将滑台和滑台上部件的自重平衡掉,算法是否就和卧式的一样了?请老师们给予帮助.谢谢啦~~

随风而去 发表于 2007-4-26 18:16:06

Re: 卧式和立式机床,计算步进电机输出的总力矩M---[求教]

顶起来看看,瞧有没有高手解答~~~

philharmonia 发表于 2007-4-26 22:46:15

Re: 卧式和立式机床,计算步进电机输出的总力矩M---[求教]

在卧式请况下,摩擦力是由可滑动部件重力产生的。机械滑台和立柱连接,可以用链条将平衡重和滑台的滑动部件相连接,平衡滑动部件自重。为选择步进电机计算转矩时,导轨摩擦折算至电机的转矩 是否为零呢?期待高手~~

syw开门造车 发表于 2007-4-26 22:56:10

Re: 卧式和立式机床,计算步进电机输出的总力矩M---[求教]

卷毛艺术家 网友好!

你在4楼的发言:“为防止滑台下滑而安置制动器,如用制动器产生的摩擦力将滑台
和滑台上部件的自重平衡掉,算法是否就和卧式的一样了?”

我认为不一样,因为,卧式是克服摩擦力的问题,而立式克服的是重力加速度问题。

我不知道我的理解对否?

syw070426---22.55

syw开门造车 发表于 2007-4-27 16:05:33

Re: 卧式和立式机床,计算步进电机输出的总力矩M---[求教]

卷毛艺术家 网友好!

今天去了趟沈阳,在一个楼寓乘坐电梯时想到了本帖这道题,可以借用电梯做一比喻:

同等重量的电梯向上提升时用的功,和向下运动时用的功是不一样的,因为存在
一个重力加速度。

如果,将电梯按上轮子放倒,进行前后牵引,两个方向做的功是相同的。

syw070427---16.05

philharmonia 发表于 2007-4-27 22:43:08

Re: 卧式和立式机床,计算步进电机输出的总力矩M---[求教]

syw开门造车网友好!

我感觉计算Ma ---电机启动加速力矩(N.m) 时应考虑重力加速度;

可Mf---导轨摩擦折算至电机的转矩(N.m) 应怎样考虑?谢谢~~

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