Evenson, McKeown, Edwards & Lenahan, P.L.L.C.
Revolving armature for rotary electric machinery
 A plurality of insulator-coated coils wound in slots of a magnetic core in multiple layers have end portions including at least contact portions without insulator coatings and connected to risers of a commutator, and adjacent portions next to the contact portions but out of the risers. A stepped portion is formed in at least one of the adjacent portion of an upper coil and the adjacent portion of a lower coil of the insulator-coated coils wound in multiple layers at a location where the upper coil and the lower coil face each other in crossing relation. A sufficient gap distance between the upper and lower coils is ensured at the location where the coils cross each other, and the productivity of revolving armatures is improved. 
Hitachi, Ltd.
Y H H Y
Y10T H01R H02K Y10T
additional inventional inventional additional
Yoshimi Shigeru
Mori Yumiyama