Matsushita Electric Industrial Co., Ltd.

Matsushita Electric Industrial

Kouji Kuyama

Kodo Fukuoka

Shigeru Yoshida

Miyuki Furuya

Makoto Hasegawa

Yukihiro Okada

Hiroyasu Fujinaka

Hiroto Inoue

Taro Kishibe

Hiroyoshi Teshima

Toshiaki Tsuzaki

Mikio Hirano

Shigenori Uda

Hironobu Nishida

Syougo Hamamoto

Shuichi Yamane

Akio Ando

Masashi Senoo

Yuko Otani

A bearing supporter and stator supporter concentric with the bearing supporter and for being mounted with a stator assembly are provided on a motor base. Around the bearing supporter, lower faces of metal terminals are exposed from a bottom face of a base section. The stator assembly is fit on and fixed to the stator supporter. Further the motor base has a stator stopper protruded from the base section, and the stator stopper faces closely a lower end face of an outer wall of the stator assembly in axial direction. This structure allows a motor to be reflow-soldered to a board of an apparatus using this motor, and increases impact-resistance against radial load and thrust load applied to a radial and thrust bearings, a coupling section of the bearing supporter and the motor base, a coupling section of a shaft, a coupling section of the motor and the apparatus.

Small and flat vibrational motor having impact-resistant structure

A turntable device includes a disc base on the circumference thereof, and the disc base has a hardness more than a given level. The surface of the disc base is roughened at a given level in order to prevent the disc from slipping and adhesion to the disc base. The disc base can compensate surface wobble caused by the disc base. A manufacturing method of the turntable device includes the steps of: a) dripping liquid resin mixed with fine particles on the circumference of the turntable; and b) hardening the resin to form the disc base. The turntable device is good for e.g. CD players, optical disc driving apparatuses.

Turntable device and manufacturing method thereof

A motor includes a stator and a rotor facing the stator. The rotor has a magnet and an eccentric weight. The magnet is magnetized in a rotational direction and produces driving magnetic field. The eccentric weight is made of the material having a greater specific gravity than the magnet. The magnet shapes in a cylinder and a part of the cylinder is cut away to form a space. The eccentric weight is placed in the space. A rotational area of the magnet and that of the eccentric weight overlap each other. In this structure, rotation of the rotor spins the eccentric weight, thereby producing large vibrations. The eccentric weight is accommodated by a motor housing for the safety. The thin and compact motor is thus obtainable.

Vibration motor having an eccentric weight and device including the same motor

Motor

According to the present invention, a coreless motor is provided, which comprises: a stator having a circular slot therein, magnets on a wall of the slot, two brushes attached thereto, and metals, which are arranged concentrically; and a rotor having a shaft rotatably supported by the metals, a coil assembly, and a commutator arranged around the shaft, the coil assembly having successive 1st to Nth coils in the slot confronting the magnets and (N+1) taps and a commutator including segments respectively connected to the (N+1) taps, the first to Nth coils connected to the segments through the (N+1) taps respectively, the two brushes selectively contacting with two of the segments successively. The 1st-Nth coils have a sleeve form and each has a rectangular winding pattern, the 1st-Nth coils and the (N+1) taps form a continuous wire, and a coil opening angle is substantially 180.degree. and a coil pitch is 180.degree./(N+1) to 360.degree./(N+1). Open end coils may be provided both ends of 1st-Nth coils to provide loop form taps. The coils may be formed of a high tensile force strength wire. That is, the coils may comprise an alloy including at least copper and silver and having a resistivity from 2.mu..OMEGA..multidot.cm to 3.5.mu..OMEGA..multidot.cm and a tensile force strength from 200 N/mm.sup.2 to 500 N/mm.sup.2.

Sleeve type of coreless motor with reduced starting current

A coreless motor has a cylindrical shell of magnetic material, a column-like magnet securely and coaxially positioned in the shell to form a cylindrical clearance therebetween, and a rotor. The rotor includes a cylindrical winding of a coil, arranged coaxially in the clearance, a commutator mechanically supporting one end of the winding and electrically connected with the coil, and a shaft for supporting the commutator. The motor further includes a pair of brushes arranged in contact with the commutator,such that an electric current is supplied via the commutator to the coil. A first bearing is mounted at an end portion of the magnet adjacent the commutator to rotatably support a first portion of the shaft, and a second bearing is mounted adjacent one end of the shell to rotatably support a second portion of said shaft.

Coreless motor

In a coreless motor, a shaft of the coreless motor does not pass through a magnet but is arranged in series with a columnar magnet on the same axis. The magnet is inserted in a tubular frame made of magnetic material and a coil which is mounted on the shaft is inserted in the gap between the outer surface of the magnet and the inner surface of the frame.

A DC brushless motor for use in various kinds of electric appliances comprises a rotor portion, and this rotor portion includes a rotating shaft and a cylindrical permanent magnet which is rotated with the shaft. A stator portion is provided opposite to the rotor portion, and includes an armature which is located at the inner side of the cylindrical permanent magnet so as to be opposite to and coaxial with the magnet. The armature is provided with a plurality of coils on its peripheries, and has an annular shape as a whole. A circuit board is disposed to be substantially perpendicular to the axis line of the rotating shaft, and the armature is supported above the circuit board. The rotating shaft terminates substantially at the middle of the height of the motor, thus leaving a space between the rotating shaft and the circuit board. An integrated circuit device for driving the motor or drive control of it is provided in the space which faces a central part of the armature, and displaced from the coils on the peripheries of the armature in the radially inward direction of the rotating shaft.

DC brushless motor

Growing community of inventors

Tottori, Japan

Kouji Kuyama