Electric motor
First Claim
1. An electric motor comprising:
- a plurality of stator coils wound around a magnetic pole of a stator core, and of which lead wires are led to an external diameter side in the vicinity of one end of the stator core;
a connecting conductor holder being an insulating annular member having a through hole at the central part, in which a plurality of accommodating grooves opened to one side and formed in belt shape in circumferential direction are provided in diameter direction so as to be located in close proximity to the lead wires of said stator coils;
a first connecting conductor and a second connecting conductor each comprising a belt-like conductor accommodated in said accommodating grooves of said connecting conductor holder, and connecting terminals provided projecting from said belt-like conductor to the external diameter side of said connecting conductor holder and each connected to a predetermined lead wire of said stator coils;
wherein the lead wires of said stator coils of same phase are connected to each other through said first connecting conductor, and the lead wires to be connected to an electrically neutral point of said stator coils are connected through said second connecting conductor; and
a plurality of said first connecting conductors are provided, each having a cross-sectional area sized to make electric resistance of each phase equal after connecting the lead wires of said stator coils.
1 Assignment
0 Petitions
Accused Products
Abstract
A small-sized and inexpensive electric motor in which connection of a stator coil is easy, the connecting portion occupies a small space, and stable torque characteristics are obtained by making electric resistance uniform. A coil bobbin is mounted on a magnetic pole of a stator core, and a stator coil is fitted. A lead wire is led to an external diameter side of one end of the stator core. A connecting conductor holder with a common coil-connecting conductor, connecting conductors for each phase and a through hole is mounted on an end of a coil bobbin. The common coil-connecting conductor has connecting terminals projecting in radial directions, and the connecting conductors for each phase have such a cross-sectional area as to equalize electric resistance of each phase after connecting the stator coil. The through hole is formed to allow a bearing-housing portion to be inserted.
129 Citations
8 Claims
-
1. An electric motor comprising:
-
a plurality of stator coils wound around a magnetic pole of a stator core, and of which lead wires are led to an external diameter side in the vicinity of one end of the stator core;
a connecting conductor holder being an insulating annular member having a through hole at the central part, in which a plurality of accommodating grooves opened to one side and formed in belt shape in circumferential direction are provided in diameter direction so as to be located in close proximity to the lead wires of said stator coils;
a first connecting conductor and a second connecting conductor each comprising a belt-like conductor accommodated in said accommodating grooves of said connecting conductor holder, and connecting terminals provided projecting from said belt-like conductor to the external diameter side of said connecting conductor holder and each connected to a predetermined lead wire of said stator coils;
wherein the lead wires of said stator coils of same phase are connected to each other through said first connecting conductor, and the lead wires to be connected to an electrically neutral point of said stator coils are connected through said second connecting conductor; and
a plurality of said first connecting conductors are provided, each having a cross-sectional area sized to make electric resistance of each phase equal after connecting the lead wires of said stator coils. - View Dependent Claims (2, 3)
-
-
4. An electric motor comprising:
-
a plurality of stator coils wound around a magnetic pole of a stator core, and of which lead wires are led to an external diameter side in the vicinity of one end of the stator core;
a connecting conductor holder being an insulating annular member having a through hole at the central part, in which a plurality of accommodating grooves opened to one side and formed in belt shape in circumferential direction are provided in diameter direction so as to be located in close proximity to the lead wires of said stator coils;
first connecting conductors having a belt-like conductor accommodated in said accommodating grooves of said connecting conductor holder, and connecting terminals provided projecting from the mentioned belt-like conductor to the external diameter side of said connecting conductor holder and each connected to a predetermined lead wire of said stator coils;
second connecting conductor having a conductor plate mounted on a side of the connecting conductor holder opposite said plurality of accommodating grooves, and connecting terminals projecting from the conductor plate to the external diameter side of said connecting conductor holder and each connected to a predetermined lead wire of said stator coils;
wherein the lead wires of said stator coils of same phase are connected to each other through said first connecting conductor, and the lead wires to be connected to an electrically neutral point of said stator coils are connected through said second connecting conductor. - View Dependent Claims (5, 6, 7)
-
-
8. An electric motor comprising:
-
a plurality of stator coils wound around a magnetic pole of a stator core, and of which lead wires are led to an external diameter side in the vicinity of one end of the stator core;
a connecting conductor holder being an insulating annular member having a through hole at the central part, in which a plurality of accommodating grooves opened to one side and formed in belt shape in circumferential direction are provided in diameter direction so as to be located in close proximity to the lead wires of said stator coils;
a first connecting conductor and a second connecting conductor each comprising a belt-like conductor accommodated in said accommodating grooves of said connecting conductor holder, and connecting terminals provided projecting from said belt-like conductor to the external diameter side of said connecting conductor holder and each connected to a predetermined lead wire of said stator coils;
wherein the lead wires of said stator coils of same phase are connected to each other through said first connecting conductor, and the lead wires to be connected to an electrically neutral point of said stator coils are connected through said second connecting conductor;
said first connecting conductor has a rectangular cross-section; and
a plurality of said first connection conductors are provided, and said rectangular-cross section of each one of said plurality of said first connecting conductors is varied in width to make electric resistance of each one of said plurality of said first connecting conductors equal after connecting the lead wires of said stator coils.
-
Specification