Stepping motor for meter
AssigneeMinebea Co., Ltd.
InventorsShoji Yoshitomi, Katsutoshi Suzuki, Masatomo Komaki
Life of this patent
Estimating the term…
Abstract
A stepping motor for a meter to rotate a pointer of a meter, the stepping motor for a meter includes: a rotor part having: a cylindrical magnet; and a rotational shaft, which is hollow and made of a resin, and which is molded on an inner periphery of the cylindrical magnet and is coaxial with the cylindrical magnet; a stator part that contains the rotor part therein and has an excitation coil; a front plate made of a resin, and an end plate made of a resin, wherein a fixing part to fix the cylindrical magnet is molded when molding the rotational shaft, and wherein the cylindrical magnet is fixed by the fixing part so that the cylindrical magnet and the rotational shaft are integrated.
Claims6
A stepping motor for a meter to rotate a pointer of the meter, the stepping motor for a meter comprising:
- a rotor part comprising:
- a cylindrical magnet;
- and
- a rotational shaft being hollow and made of a resin, wherein the rotational shaft is molded on an inner periphery of the cylindrical magnet and is coaxial with the cylindrical magnet;
- wherein a stopper part is provided to the rotational shaft,
- wherein a stopper pin is provided on a position corresponding to a radial position of the stopper part that is rotated with rotating of the rotational shaft, and
- wherein the rotation of the rotational shaft is restrained by contacting of the stopper part with the stopper pin,
- a stator part that contains the rotor part therein and has an excitation coil;
- a front plate made of a resin, and
- an end plate made of a resin,
- wherein a holding portion provided to fix the cylindrical magnet is molded when molding the rotational shaft, and
- wherein the cylindrical magnet is fixed by the holding portion so that the cylindrical magnet and the rotational shaft are integrated with omitting a sleeve.
A stepping motor for use as part of a meter to rotate a pointer of the meter, the stepping motor comprising:
- a rotor part comprising:
- a cylindrical magnet;
- and
- a rotational shaft being a unitary construction made of a resin and having a hollow interior area formed therein, wherein the rotational shaft is molded on an inner periphery of the cylindrical magnet and is coaxial with the cylindrical magnet;
- wherein a stopper part is provided to the rotational shaft,
- wherein a stopper pin is provided on a position corresponding to a radial position of the stopper part that is rotated with rotating of the rotational shaft, and
- wherein the rotation of the rotational shaft is restrained by contacting of the stopper part with the stopper pin,
- a stator part that contains the rotor part therein and has an excitation coil;
- a pointer comprising a pointing part and a shaft part;
- a front plate made of a resin, and
- an end plate made of a resin,
- wherein:
- a holding portion provided to fix the cylindrical magnet is molded when molding the rotational shaft,
- the cylindrical magnet is fixed by the holding portion so that the cylindrical magnet and the rotational shaft are integrated, and
- the shaft part of the pointer is inserted into the hollow interior area of the rotational shaft, and is in direct contact with the rotational shaft.
Dependencies are inferred from the claim text.