| 摘要 |
PROBLEM TO BE SOLVED: To provide a flat type vibration motor in which the manufacturing cost is reduced by providing only two armature coils and eliminating dead points for starting. SOLUTION: An annular starter 4 divided into eight equal sections in the peripheral direction and alternately magnetized to N poles and S poles and a rotor 5 of almost fan shape having its face facing the starter 4 and rotatable freely are disposed in a casing, and two armature coils 11 of the 60 deg. coil winding angle are provided at the 150 deg. disposing pitch on the rotor 5, and a non-magnetic weight member 21 is provided between two armature coils 11, and a commutator base 14 with twelve commutators provided in parallel with in the peripheral direction is fixed and a pair of brushes 12 are brought into contact with the above commutators 10 at the 135 deg. electric angle in a casing 3.
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