Tokyo Parts Industrial Co., Ltd.

Satoru Shimosegawa

Tadao Yamaguchi

Masahiro Takagi

Kentaro Fujii

Tetsushi Yashima

Tetushi Yashima

An axial-air-gap brushless vibration motor has an eccentric rotor R in which an axial-air-gap magnet and an arched weight are provided in a rotor yoke which is rotatably mounted on a shaft fixed to a yoke bracket. A stator base is attached to the yoke bracket which includes a magnetic portion receiving the magnetic field of the magnet and a nonmagnetic portion. One Hall sensor and a drive circuit member for receiving output of the Hall sensor are disposed so that they do not overlap on a radial plane, of the stator base which has single-phase air-core armature coils installed. A cover member is welded to the yoke bracket.

Axial-air-gap brushless vibration motor containing drive circuit

An eccentric rotor wherein a printed wiring board in which commutator segments are formed at a first surface, two wound air-cored coils arranged with a prescribed arrangement angle about the shaft as a center at the second surface of the printed wiring board, and a weight are integrally molded into a disk-like shape with a resin by injection molding. The weight comprises a first surface of the weight which is exposed at the side surface of the rotor together with the first surface of the printed wiring board and a second surface of the weight which is exposed at the other surface of the rotor together with the wound air-cored coil. The resin which integrates the aforementioned components and forms an outer peripheral resin portion having a circular-arc periphery about the shaft as a center. The outer contours of the weight and printed wiring board are so formed as to assume positions separated from the outer periphery inwardly in a circular-arc portion. In the circular-arc portion at the outer periphery of the rotor, a continuous circular-arc protrusion covering the first surface of the weight and the first surface of the printed wiring board at one surface side of the rotor is formed integrally with the outer peripheral resin portion.

Growing community of inventors

Isesaki, Japan

Satoru Shimosegawa