直流电动机中电枢磁动势的轴线位置是由电刷位置决定的，电刷具有箝位的功能。

In DC motor, the locality of axis of armature MMF was determined by the brush position, here the brush possessed a function of clamping.

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直流电动机中电枢磁动势的轴线位置是由电刷位置决定的，电刷具有箝位的功能。

Aimed at the feature that the locality of axis of the armature MMF is determined by the brush in dc motor, a new concept on clamp is proposed.

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针对直流电动机中电枢磁动势的轴线位置由电刷决定的特征，提出了箝位概念，指出自控变频乃是箝位效应的直接后果。

Aimed at the feature that the locality of axis of the armature MMF is determined by the brush in dc motor, a new concept on clamp is proposed.

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