Stepping motor and manufacturing method thereof
First Claim
1. A method of manufacturing a stator member for a stepping motor, comprising the steps of:
- placing a coil member on a mold, the coil member having a central shaft portion and a pair of flange portions extending from both ends of the central shaft portion, the coil member having wirings wound around the central shaft portion between the pair of flange portions, the central shaft member having an inner peripheral wall defining a cylindrical hollow portion;
placing at least one yoke member on a mold, the yoke member including an annular base plate portion and a plurality of teeth-shaped magnetic pole portions extending upright from the base plate portion, the teeth portions being inserted into the cylindrical hollow portion of the coil member from its one end, one surface of each of the teeth portions facing the mold being in contact with a surface of the mold;
pressing the yoke member and the coil member toward each other in a direction along the central shaft portion of the coil member so that the base plate portion of the yoke member may be brought into contact with one flange portion of the coil member; and
providing hardenable material in a space enclosed by the surface of the mold and surfaces of the pressed together coil member and the yoke member, to thereby integrally unite the coil member and the yoke member into one stator member.
1 Assignment
0 Petitions
Accused Products
Abstract
A method of manufacturing a stator member for a stepping motor of the present invention comprises the steps of: placing a coil member on a mold; placing a yoke member on a mold with its teeth portions being inserted into a cylindrical hollow portion of the coil member from its one end, one surface of each of the teeth portions facing the mold being in contact with a surface of the mold; pressing the yoke member toward the coil member in a direction along the central shaft portion of the coil member so that a base plate portion of the yoke member may be brought into contact with a flange portion of the coil member; and providing hardenable material in a space enclosed by the surface of the mold and surfaces of the coil member and the yoke member, to thereby integrally uniting the coil member and the yoke member into one stator member.
68 Citations
21 Claims
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1. A method of manufacturing a stator member for a stepping motor, comprising the steps of:
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placing a coil member on a mold, the coil member having a central shaft portion and a pair of flange portions extending from both ends of the central shaft portion, the coil member having wirings wound around the central shaft portion between the pair of flange portions, the central shaft member having an inner peripheral wall defining a cylindrical hollow portion; placing at least one yoke member on a mold, the yoke member including an annular base plate portion and a plurality of teeth-shaped magnetic pole portions extending upright from the base plate portion, the teeth portions being inserted into the cylindrical hollow portion of the coil member from its one end, one surface of each of the teeth portions facing the mold being in contact with a surface of the mold; pressing the yoke member and the coil member toward each other in a direction along the central shaft portion of the coil member so that the base plate portion of the yoke member may be brought into contact with one flange portion of the coil member; and providing hardenable material in a space enclosed by the surface of the mold and surfaces of the pressed together coil member and the yoke member, to thereby integrally unite the coil member and the yoke member into one stator member. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method of manufacturing a stator member for a stepping motor, comprising the steps of:
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placing two pairs of yoke members on two coil members in such a manner that teeth portions of each pair of the yoke members are inserted into a cylindrical hollow portion of a central shaft portion of each of the coil members from both ends thereof, each of the coil members having the central shaft portion and a pair of flange portions extending from both ends of the central shaft portion, each of the coil members having wirings wound around the central shaft portion between the pair of flange portions, the central shaft portion having an inner peripheral wall defining the cylindrical hollow portion, each one of the pairs of yoke members including an annular base plate portion and a plurality of teeth-shaped magnetic pole portions extending upright from the base plate portion, the teeth portions of each one pair of the yoke members being arranged along the inner peripheral wall of corresponding one coil member such that each two adjacent teeth, portions of selected one of the pair of yoke members sandwich each corresponding one tooth portion of the other one of the pair of yoke members; placing on a mold the coil members on which the pairs of yoke members are thus mounted in such a manner that the coil members are stacked one on the other in a direction along the central shaft portions thereof, one surface of each of the teeth portions of the yoke members facing the mold being in contact with a surface of the mold; compressing the thus stacked members in a direction along the central shaft members of the coil members so that the base plate portions of the yoke members may be brought into contact with both the flange portions of the coil member on which the yoke members are mounted and the flange portions of the coil members facing each other may be brought into contact with each other; and providing hardenable material in a space enclosed by the surface of the mold and surfaces of the pressed together coil members and the yoke members, to thereby integrally uniting the coil members and the yoke members into one stator member. - View Dependent Claims (10)
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11. A stator for a stepping motor, comprising:
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a coil member having a central shaft portion having an axis and a pair of flange portions extending from both ends of the central shaft portion, said coil member having wirings wound around the central shaft portion between the pair of flange portions, the central shaft portion having an inner peripheral wall defining a cylindrical hollow portion; a pair of yoke members, each of said yoke members including an annular base plate portion and a plurality of teeth-shaped magnetic pole portions extending upright from the base plate portion, the teeth portions being inserted into the hollow portion of the central shaft of said coil member from its both ends to thereby extend along the inner peripheral wall thereof, the base plate portions being in contact with the flange portions of said coil member, the teeth portions of said pair of yoke members being arranged along the inner peripheral wall of said coil member such that each two adjacent teeth portions of selected one of said pair of yoke members, sandwich each corresponding one tooth portion of the other one of said pair of yoke members; and a hardened material structure filled in a space formed by a cylindrical surface defined by surfaces of the teeth portions facing the axis of said coil member and surfaces of said coil member and said yoke members. - View Dependent Claims (12, 13, 14, 15, 16, 17)
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18. A stator for a stepping motor, comprising:
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two coil members, each having a central shaft portion having an axis and a pair of flange portions extending from both ends of the central shaft portion, each of said coil members having wirings wound around the central shaft portion between the pair of flange portions, the central shaft portion having an inner peripheral wall defining a cylindrical hollow portion, said two coil members being stacked one on the other in a direction along their axes; two pairs of yoke members, each of said including an annular base plate portion and a plurality of teeth-shaped magnetic pole portions extending upright from the base plate portion, one pair of said yoke members being mounted on one of said coil members and the other pair of yoke members being mounted on the other one of said coil members in such a manner that the teeth portions of each one pair of said yoke members are inserted into the hollow portion of the central shaft of corresponding one of said coil members from its both ends to thereby extend along its inner peripheral wall and the base plate portions of each one pair of said yoke members are in contact with the flange portions of corresponding one of said coil members, the flange portions of said coil members facing each other being in contact with each other, the teeth portions of each one of said pair of yoke members being arranged along the inner peripheral wall of corresponding one of said coil members such that each two adjacent teeth portions of selected one of said each pair of yoke members sandwich each corresponding one tooth portion of the other one of said each pair of yoke members; and a hardened material structure filled in a space formed by a cylindrical surface defined by surfaces of the teeth portions facing the axis of said coil members and surfaces of said coil members and said yoke members. - View Dependent Claims (19, 20, 21)
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Specification