Motor manufacturing method using single plate for yoke

Abstract

In a motor yoke manufacturing method, a flat metal plate is die-cut into a base plate for a yoke which comprises a bottom wall and a side wall. The base plate is plastically deformed to form a bearing accommodating holder and protrusions on the bottom wall. After a bearing member is placed in the bearing accommodating holder, a resilient plate is placed in contact with the bearing member and the protrusions are plastically deformed to tightly fix the resilient plate to the bottom wall. The base plate is plastically deformed to shape a generally bottomed cylindrical configuration of the yoke. Thus, the yoke is manufactured without a flushing process for removing machining oil or machining debris.