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Answer Posted / m_anwar
The speed of a series motor with no load connected to it
increases to the point where the motor may become damaged.
Usually, either the bearings are damaged or the windings
fly out of the slots in the armature. There is a danger to
both equipment and personnel. Some load must ALWAYS be
connected to a series motor before you turn it on. This
precaution is primarily for large motors. Small motors,
such as those used in electric hand drills, have enough
internal friction to load themselves.
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