Stepping motor
AssigneeMatsushita Electric Industrial Co., Ltd.
InventorsSatoshi Suyama, Toru Arakawa
Life of this patent
Estimating the term…
Abstract
A compact stepping motor is equipped with at least four stator plates positioned in parallel with each other, a rotor with a rotary axis perpendicular to the stator plates, and at least two energizing coils each positioned between each two of the stator plates. The rotor is positioned out of the energizing coils. The center axes of the coils and the rotary axis of the rotor are in parallel with each other. One coil is positioned between one pair of stator plates and one coil is positioned between the other pair of stator plates and share a common center axis. Circumferentially arranged stator poles extend from each stator plate perpendicularly to the each stator plate so as to surround the rotor at a specified distance.
Claims10
A stepping motor comprising:
- at least two pairs of parallel stator plates each having a first hole and a second hole having a circular circumference from which a plurality of stator poles are extended in a perpendicular direction to each plate of said pair of stator plates and arranged circumferentially at predetermined constant intervals, each pair of stator plates of said at least two pairs of stator plates being disposed so that said stator poles of said each pair of stator plates are arranged alternately so as to form a cylindrical space surrounded by said alternately arranged stator poles, one stator plate of one of said pairs of stator plates of said at least two pairs of stator plates being in contact with one stator plate of another pair of stator plates of said at least two pairs of stator plates so that one end of said cylindrical space formed by said one pair of stator plates coincides with one end of said cylindrical space formed by said another pair of stator plates to form an extended cylindrical space;
- a cylindrical rotor disposed within said extended cylindrical space and having a plurality of alternately arranged N and S permanent magnet poles at a side surface thereof, each of said permanent magnet poles extending in a direction parallel to a rotational axis of said rotor and opposing said stator poles at a predetermined constant distance from said stator poles;
- a common core rod penetrating said at least two pairs of parallel stator plates each through said first hole so as to be in parallel to said rotational axis of said rotor;
- and
- at least one pair of energizing coils each disposed between said each pair of stator plates and wound around said common core rod so that said common core rod magnetically couples said at least two pairs of parallel stator plates, whereby said rotor is positioned out of each of said at one pair of energizing coils.
Dependencies are inferred from the claim text.