JP2008245452A - Motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a motor capable of improving a disadvantage of conventional motors which lies in the fact that stress is generated on the connection portion of a leading line by external forces to cause a contact failure and a break. <P>SOLUTION: The motor with an inner-rotor structure includes: a stator core having a claw magnetic pole; a toroidal coil; and a resin molded bobbin having circular flanges on the upper and the lower. Further, the motor includes a stator pack provided with a projection on a portion of the circumference of one flange of the bobbin. A leading line holding portion is constituted by bending the projection toward the other flange. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an electric motor, and more particularly to an inner rotor structure electric motor having an annular coil.

  Electric motors, particularly claw pole type motors, are used in the OA field and the automobile field because of their low cost configuration and simplicity of the drive circuit. A plurality of upper and lower claw magnetic poles are provided on the inner periphery of the stator core, and an annular coil is sandwiched between the upper and lower claw magnetic poles so that a single stator set for one phase is integrally formed by molding. A ring-shaped magnet rotor that is rotatably supported through a predetermined gap is provided on the inner peripheral side of each of the two, and a single stator set having the same shape is arranged in the axial direction while being shifted by 120 degrees in electrical angle. A three-phase claw pole type motor constituting a phase is proposed in Patent Document 1.

  FIG. 7 shows such a conventional inward-rotating three-phase claw pole type motor, wherein 1 is a shaft, 2 is a rotor, 3 is a magnet attached to the rotor 2, 4 is an annular coil, and 5 and 6 are for one phase. The stator core.

  The annular coil 4 is insulated and inserted between the stator cores 5 and 6, and the whole is resin-molded to constitute a stator set.

FIG. 8 is an enlarged view of a portion where the lead wire 9 is connected to the winding start 7 and winding end 8 of the annular coil 4. Reference numeral 11 denotes a connecting portion 11 in which a lead wire 9 is connected to the winding start 7 and the winding end 8, and a heat-shrinkable insulating tube 10 is inserted into the connecting portion 11.
JP 2007-039077 A

  However, the following problems have arisen in the conventional drawing work of the annular coil.

  (1) Due to the external force applied to the lead wire, stress is generated in the annular coil and the lead wire connecting portion, and the reliability against contact failure and disconnection is insufficient.

  (2) The outer periphery of the stator core is circular, and the connecting portion that connects the lead wire to the winding start and winding end of the annular coil is located on the circumference of the stator core and is fixed by a resin mold. Affected by.

  (3) Taping or the like is necessary for the insulation treatment of the annular coil, and workability is poor.

  (4) Since pressure is applied to the connecting portion during resin molding and may come into contact with the stator core, it is necessary to insert an insulating shrinkable tube or the like, and workability is poor.

  The present invention aims to solve the above problems and improve the reliability and workability of leader lines.

  An electric motor of the present invention is an inner rotor structure electric motor comprising a stator core having claw magnetic poles, an annular coil, and a resin-molded bobbin having circular flanges on the upper and lower sides, and a part of the outer periphery of one flange of the bobbin. It has a stator set which provided the convex part and bent this convex part to the other flange direction, and comprised the leader line holding part.

  The electric motor of the present invention is an inner rotor structure electric motor comprising a stator core having claw magnetic poles, an annular coil, and a resin-molded bobbin having upper and lower circular flanges, and an outer periphery of one of the flanges of the bobbin. It has a stator set in which a protruding portion is provided, and the protruding portion is bent at a substantially right angle to the other flange direction to form a lead wire holding portion.

  Further, a space for connecting the end of the annular coil and the lead wire is provided in a part of the stator core, and the lead wire holding portion is brought into contact with the inner surface of the stator core facing the space to prevent the lead wire holding portion from falling. It is characterized by doing so.

  The stator core is formed of a dust core, and the entire stator assembly including the stator core, the annular coil, and the bobbin is resin-molded.

  Further, a U-shaped groove is provided in the leader line holding portion, and the leader line is inserted into the U-shaped groove.

  Further, the lead wire holding portion is provided with a stopper to clamp the lead wire.

  According to the electric motor of the present invention, the following excellent effects can be obtained.

  (1) The lead wire is securely fixed by a lead wire holding portion, a stopper, a resin mold, and the like, and has a structure that is not affected by external force at all. Thus, the reliability against contact failure and disconnection can be remarkably improved.

  (2) Since the annular coil is wound around a resin bobbin, taping or the like for insulation treatment is unnecessary, and workability is improved.

  (3) The lead wire holding portion is provided with a U-shaped groove portion for inserting a lead wire, so that the lead wire can be easily inserted into the lead wire holding portion after connecting the beginning and end of winding of the annular coil and the lead wire.

  (4) Even if pressure is generated during resin molding, the lead wire is fixed to the connecting portion of the lead wire and there is no possibility of contact with the stator core.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 is a perspective view of a leader line portion in Embodiment 1 of the present invention. In this embodiment, the outer periphery of a flange 13 of an annular bobbin having a U-shaped cross section formed of resin and having circular flange portions 12 and 13 on the upper and lower sides. A plate-like convex portion 15 is integrally formed on a part of the surface. FIG. 2 shows a state in which the protruding portion 15 is bent at a substantially right angle in the direction of the other flange 12 to form a lead wire holding portion 15. The bent part of the convex part 15 is used as a leader line holding part.

  FIG. 3 is a cross-sectional view of the leader line portion of the stator assembly, and FIG. 4 is an explanatory diagram of the leader wire portion of the stator assembly. A portion corresponding to the motor lead wire 9 of the stator cores 5 and 6 is provided with a space portion 16 for accommodating the connection portion 11 between the winding start 7 and winding end 8 of the annular coil and the lead wire 9. The outer peripheral surface of the lead wire holding portion is brought into contact with the inner peripheral surfaces of the stator cores 5 and 6 facing the stator core space portion 16 to prevent the lead wire holding portion from falling down.

  The stator cores 5 and 6 can be formed by a compression molding process using a dust core material.

  Since the electric motor of the present invention is configured as described above, the lead wire holding portion is pressed by the upper and lower stator cores 5 and 6 and does not fall in the direction of the arrow as shown in FIG. The connecting portion 11 between the winding start 7 and the winding end 8 of the annular coil is held at a certain interval by a partitioning portion 20 having a barbed portion 19, and the connecting portion 11 remains in the stator cores 5, 6 even when molding pressure is applied during resin molding. Do not touch.

  In another embodiment of the present invention, the lead wire 9 connected to the annular coil is pushed into the U-shaped groove 18 having the stopper 17 from above the lead wire holding portion 15 as shown in FIGS. According to this embodiment, when the leader line 9 is inserted into the U-shaped groove 18, it is easy to insert the leader line 9 in the direction A as shown in FIG. 6, but the stopper 17 is like a wedge. It is difficult to bite 9 and leave in the B direction opposite to A.

  Further, according to this embodiment, even if an external force in the B direction is applied to the lead wire 9, this external force is not applied to the connecting portion 11, and the reliability can be improved.

  According to this embodiment, after the connection work between the annular coil and the leader line is completed, the leader line 9 can be inserted into the U-shaped groove 18 from above, and the workability can be greatly improved. Further, the inserted leader line 9 does not come out upward due to the action of the barb 19 provided in the partition part 20.

  As described above, according to the electric motor of the present invention, the reliability against contact failure and disconnection can be remarkably improved, and if the workability can be improved, a great effect can be obtained, and mass production can be performed at low cost.

It is explanatory drawing of the leader line part of the electric motor of this invention. It is explanatory drawing of the leader line part of the electric motor of this invention. It is sectional drawing of the leader line part of the electric motor of this invention. It is explanatory drawing of the leader line part of the stator assembly of the electric motor of this invention. It is a front view of the leader line part of the electric motor of this invention. It is a top view of the leader line part of the electric motor of this invention. It is a disassembled perspective view which shows the conventional electric motor. It is a perspective view of the leader line part of the conventional electric motor.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Shaft 2 Rotor 3 Magnet 4 Ring coil 5 Stator core 6 Stator core 7 Beginning of winding 8 End of winding 9 Leader wire 10 Insulating tube 11 Connection part 12 Flange part 13 Flange part 15 Convex part, leader line holding part 16 Space part 17 Stopper 18 U-shape Groove 19 Maple 20 Partition

Claims (6)

  In an inner rotor structure electric motor comprising a stator core having a pawl magnetic pole, an annular coil, and a resin molded bobbin having a circular flange above and below, a convex portion is provided on a part of the outer circumference of one flange of the bobbin, An electric motor comprising a stator set in which a lead wire holding portion is formed by bending a convex portion toward the other flange.   In an inner rotor structure electric motor comprising a stator core having a pawl magnetic pole, an annular coil, and a resin molded bobbin having a circular flange above and below, a convex portion is provided on a part of the outer circumference of one flange of the bobbin, An electric motor comprising a stator set in which a lead wire holding portion is formed by bending a convex portion substantially perpendicular to the other flange direction.   A space for connecting the terminal of the annular coil and the lead wire is provided in a part of the stator core, and the lead wire holding portion is brought into contact with the inner surface of the stator core facing the space so as to prevent the lead wire holding portion from collapsing. The electric motor according to claim 1, wherein the electric motor is provided.   4. The electric motor according to claim 1, wherein the stator core is formed of a dust core, and the entire stator assembly including the stator core, the annular coil, and the bobbin is resin-molded.   5. The electric motor according to claim 1, wherein a U-shaped groove is provided in the lead wire holding portion, and the lead wire is inserted into the U-shaped groove.   6. The electric motor according to claim 1, wherein a stopper is provided on the leader line holding portion to clamp the leader line.

Images