Patent ID: 7518282

Claim:
A rotor comprising: a first layer having a plurality of commutators formed thereon; a second to an n-th layer—wherein n is 4 or greater—having a plurality of patterned coils formed thereon, the patterned coils connected with the commutators; insulation layers interposed in-between the first to the n-th layers; blind via holes configured to connect the commutators of the first layer with the patterned coils formed on the second layer and connect the patterned coils formed on the (n−1)-th layer with the patterned coils formed on the n-th layer; and a plurality of through holes configured to connect the patterned coils formed on the second to the (n−1)-th layers, wherein the patterned coils located on the second to the (n−1)-th layers are connected by means of different through holes.