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MVME2603-1161
MVME2603-1161当两头的线圈通上电流时,根据右手螺旋定则,会产生方向指向右的外加磁感应强度B(如粗箭头方向所示),而中间的转子会尽量使自己内部的磁感线方向与外磁感线方向保持一致,以形成一个短闭合磁力线回路,这样内转子就会按顺时针方向旋转了。 当转子磁场方向与外部磁场方向垂直时,转子所受的转动力矩大。注意这里说的是“力矩”大,而不是“力”大。诚然,在转子磁场与外部磁场方向一致时,转子所受磁力大,但此时转子呈水平状态,力臂为0,当然也就不会转动了。补充一句,力矩是力与力臂的乘积。其中一个为零,乘积就为零了。 当转子转到水平位置时,虽然不再受到转动力矩的作用,但由于惯性原因,还会继续顺时针转动,这时若改变两头螺线管的电流方向,如下图所示,转子就会继续顺时针向前转动,
MVME2603-1161
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