Dynamoelectric machine having encapsulated coil structure with one or more of phase change additives, insert molded features and insulated pinion

An electric motor including an armature and a stator, the armature, comprising:

• a shaft having a lamination stack thereon;
• the lamination stack having a plurality of slots in which magnet wires are wound forming coils having end coils at opposed ends of the lamination stack;
• thermally conductive plastic molded around the coils including the end coils;
• and
• at least one feature pre-formed of material having a thermal conductivity higher than that of the thermally conductive plastic insert molded on at least one of the end coils when the plastic is molded so that it is disposed on an outer surface of the end coil.

A power tool having an electric motor including an armature and a stator, the armature, comprising:

• a shaft having a lamination stack thereon;
• the lamination stack having a plurality of slots in which magnet wires are wound forming coils having end coils at opposed ends of the lamination stack;
• thermally conductive plastic molded around the coils including the end coils;
• and
• at least one feature pre-formed of material having a thermal conductivity higher than that of the thermally conductive plastic insert molded on at least one of the end coils when the plastic is molded so that it is disposed on an outer surface of the end coil.