Flat-type vibration motor for cellular phone, has pair of coil unit each having pair of armature coil assemblies that are similarly wound and connected in common neutral point

摘要

A pair of brushes (60) are spaced apart at an interval of an electrical angle in the range pi //2 to 3 pi //2. A coil unit (90) having a pair of armature coil assemblies is formed on an upper surface of an upper board (70). A pair of armature coils (91-94) in each of the assembly are similarly wound and are connected in a common neutral point such that the coil assemblies are conducted to have an electrical phase difference of pi //2.