JP4069633B2 - motor - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a motor used in a magnetic disk device, an optical disk device or the like.
[0002]
[Prior art]
Hereinafter, an example of a conventional thin motor used in a magnetic disk device, an optical disk device or the like will be described with reference to the drawings.
[0003]
FIG. 8 is a plan view of the iron core, FIG. 9 is a partially enlarged view for explaining the lead wire processing of the coil wound around the magnetic pole teeth of the iron core, and FIG. 10 is a schematic side view of FIG.
[0004]
In FIG. 8, a plurality of magnetic pole tooth portions 82 having protrusions 81 on both sides in the circumferential direction at the distal end portion in the radial rotation center side, and a magnetic pole tooth coupling portion 83 that connects each magnetic pole tooth portion 82 on the radially outer diameter side. The core 85 is formed by laminating a plurality of cores 84 made of, for example, a silicon steel plate or the like.
[0005]
As shown in FIG. 9, a coil 92 is started to be wound around each magnetic pole tooth portion 91 of the iron core 85 from the magnetic pole tooth coupling portion 93 side, and after winding a predetermined number of turns, it is implanted in the magnetic pole tooth coupling portion 93. The lead wire 94 is led to a wiring holding portion (not shown), and a coil wire is drawn to form a coil of another predetermined magnetic pole tooth portion.
[0006]
Here, in order to secure the number of mounting turns by winding the coil 92 more closely, aligned winding is performed when the coil 92 is wound. That is, the pitch is shifted by the wire diameter of the coil 92 each time one turn is wound densely from the outermost periphery of the magnetic pole tooth portion 91 (on the magnetic pole tooth coupling portion 93 side). When the innermost circumference of the magnetic pole tooth portion 91 is reached, the pitch is shifted to the outer peripheral side (the magnetic pole tooth coupling portion 93 side) by the wire diameter of the coil 92 every time one turn is wound. Further, when the coil 92 corresponding to a predetermined number of coil turns is formed of an even number layer, the coil 92 is started to be wound from the outer peripheral side (the magnetic pole tooth coupling portion 93 side) of the magnetic pole tooth portion 91 and the even layer winding is finished. To move to the winding of another magnetic pole tooth. However, as shown in FIG. 10, when the coil 92 corresponding to a predetermined number of coil turns is formed with an odd number of layers, the lead wire 94 of the coil 92 crosses over the coil 92 and is a wiring holding portion (not shown). Will be led to.
[0007]
[Problems to be solved by the invention]
In recent years, various information devices have been widely used, and efforts to increase the recording density for increasing the recording capacity have been further strengthened, and the demand for smaller and thinner devices has been increasing.
[0008]
As the device becomes smaller and thinner, the coil diameter of the coil that forms the stator of the motor becomes very thin, and it is necessary to align and wind the thin wire rod. It is becoming difficult to pull out the wire.
[0009]
However, in the coil winding to the magnetic pole tooth part of the conventional iron core described above, when the coil is wound by an odd number of layers, the lead wire of the coil crosses over the coil and is led to the wiring holding part. Space for passing the lead wire is required, which obstructs the motor thinning, and the coil lead wire crosses the coil diagonally, so it is aligned in the winding process or other manufacturing processes. There is a problem in that the wound coil is loosened and cannot fit in a predetermined space, and the insulating layer of the coil is damaged, resulting in a problem in motor manufacture.
[0010]
The present invention solves the above-mentioned problems, and by providing a coil locking portion on the side of each magnetic pole tooth portion of the iron core that faces the radial rotating magnet, the lead wire of the coil does not cross over the coil. It is an object of the present invention to provide a motor having a stator that is guided to a holding portion to realize a thin shape and that has a wound winding coil without being loosened.
[0011]
[Means for Solving the Problems]
In order to achieve this object, a motor of the present invention includes a stator in which a coil is wound around an iron core in which thin plate cores are stacked, and a rotor composed of a rotating magnet facing the stator. Protrusions are provided on both sides in the circumferential direction at the tip of the magnetic pole tooth portion on the side facing the rotor. A notch portion is formed in at least one of the portions, and a plurality of wiring holding portions are provided on the magnetic pole tooth coupling portion formed of an insulating material on the iron core, and the coil is connected to the magnetic pole tooth portion of the magnetic pole tooth portion. The coil is advanced from the portion side toward the tip end side, and the lead wire of the coil is folded back through the notch portion and locked to the wiring holding portion .
[0012]
With this configuration, the position of the coil wound around each magnetic pole tooth portion is accurately regulated without providing a member for regulating the position of the coil, and the coil wound in alignment is not loosened. The aligned winding state can be maintained, and the lead wire drawn from the coil does not contact the coil and does not overlap with the coil. No space is required, and the thickness can be reduced accordingly.
[0013]
In addition, the notch portion of the iron core is formed by a line connecting the notch bottom portion on the magnetic pole tooth portion coupling portion side and the end portion on the magnetic pole tooth portion coupling portion side of the opening, and a center line passing through the rotation center of the magnetic pole tooth portion. The angle θ formed is 90 ° or less, and the bottom of the notch is located on the outer side in the circumferential direction from the outermost circumferential surface of the coil wound around the magnetic pole teeth, so that the notch is locked to the notch. It is also possible to maintain and secure the aligned winding of the coil wound around the magnetic pole tooth portion without dropping the coil from the notch portion.
[0014]
Furthermore, the protrusion provided at the tip of the magnetic pole tooth is located on both sides in the circumferential direction from the tip of the magnetic pole tooth to the radial magnetic pole tooth coupling part, and at least the protrusion on the side where the coil is locked By making the end surface of the magnetic pole tooth portion from the tip to the tip portion slightly outside the circumferential outermost circumferential surface of the wound coil, the lead wire drawn from the coil may come into contact with the coil In addition, the coil does not overlap with the coil, and does not require a space in the direction of the axis of rotation for the lead wire.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0016]
(Embodiment 1)
1-4 is a figure for demonstrating the structure of the stator in this Embodiment 1, FIG. 1 (a) is a top view of the stator comprised with an iron core and a coil, FIG.1 (b) is a coil. FIG. 2 is a plan view for explaining the shape of one magnetic pole tooth portion of the core constituting the iron core, and FIG. 3 is FIG. FIG. 4 is a side view of FIG. 3.
[0017]
In FIG. 1, magnetic pole teeth A1, A2, A3, B1, B2, B3, and C1, C2, C3 are included, and these magnetic pole teeth A1, A2, A3, B1, B2, B3, and Coils 3a, 3b and 3c are wound around an iron core 2 having a magnetic tooth coupling portion 1 for connecting C1, C2 and C3 so as to form an odd number of layers with a predetermined number of turns, and the iron core 2 and the coils 3a and 3b are wound. , 3c constitute a stator 4. As is well known, a rotating magnet (not shown) magnetized with a plurality of magnetic poles is arranged opposite to the iron core 2 on the radially inner side (rotation center O side) of the stator 4, that is, on the side opposite to the magnetic pole tooth coupling portion 1. It is installed. The coil 3a is started from the coil winding start 3as, and is wound in the order of the magnetic pole tooth portions A1, A2, and A3. Similarly, the coil 3b is wound from the coil winding start 3bs to the magnetic pole tooth portions B1, B2, and B3, and the coil 3c is wound from the winding start 3cs to the magnetic pole tooth portions C1, C2, and C3 in this order. The respective winding end lines 3ae, 3be and 3ce are concentrated at a relay point 5 with a wiring board (not shown) disposed on the iron core 2 to form a common contact. Further, as shown in FIG. 1B, a wiring holding portion 6 formed of an insulating material on the iron core 2 and having a laterally inverted L-shape is provided between the magnetic pole tooth portion C3 and the magnetic pole tooth portion A1. It is provided between each of the magnetic pole tooth portions except for and in the vicinity of the magnetic pole tooth portion C3. The lead wires 7a, 7b, and 7c of the coils 3a, 3b, and 3c wound around the magnetic pole tooth portions A1, A2, A3, B1, B2, B3, C1, C2, and C3 are respectively connected to the magnetic pole tooth portions. A1, A2, A3, B1, B2, B3, and C1, C2, C3 are arranged on the inner side in the radial direction, on the opposite side of the magnetic pole tooth coupling portion 1, that is, on the tip portion facing the rotating magnet (not shown). The coil is locked by the wiring holding portion 6 disposed on the magnetic pole tooth coupling portion 1 through the concave portion of the notch portion 9 provided on either one of the protruding portions 8 provided on both sides in the direction, and the coil Or loosening from the upper surface of the magnetic pole tooth coupling portion 1 of the iron core 2 to the outside or inside in the radial direction. Here, FIG. 1 illustrates a nine-pole motor, but the present invention is not limited to this.
[0018]
In FIG. 2, each magnetic pole tooth portion 22 of the iron core 21 constituting the iron core 2 has a radially inner side that is opposite to the magnetic pole tooth coupling portion 1, that is, a tip portion on the side facing the rotating magnet (not shown). The protrusions 23 are provided on both sides in the circumferential direction, and the outermost distal end surface 23a of the protrusions 23 on both sides is from the outermost part in the circumferential direction of a coil (not shown) wound around the magnetic pole tooth part 22. Is also formed on the outside, and a substantially U-shaped cutout 24 is formed on one of the protrusions 23 on both sides. The notch 24 is a line 29 that connects a notch bottom 26 on the side where a coil (not shown) is locked, that is, the pole tooth coupling part 25 side, and an end 28 on the pole tooth coupling part 25 side of the opening 27. And the center line 30 passing through the rotation center of the magnetic pole tooth portion 22 of the iron core 21 around which the coil is wound is 90 ° or less, and the notch bottom portion 26 of the notch portion 24 is wound. The coil (not shown) has a substantially U-shape that is located outside the outermost circumferential surface in the circumferential direction. By setting the angle θ to be 90 ° or less, that is, a right angle or an acute angle, the coil locked to the notch portion 24 does not fall off from the notch portion 24. A predetermined number of iron cores 21 having such a shape are laminated to form the iron core 2.
[0019]
3 is an enlarged view of the vicinity of one magnetic pole tooth portion B3 in FIG. 1. From the winding start 3bs, the coil 3b is wound around the one magnetic pole tooth portion B3 of the iron core 2 by a predetermined number of turns. The lead wire 7b is drawn out toward the wiring holding portion 6 through the notch portion 31 of the magnetic pole tooth portion B3. A notch bottom 32 of the notch 31 is outside the circumferential outermost surface 33 of the wound coil 3b, and the wiring holding part 6 has a magnetic pole tooth B3 and a magnetic pole tooth C3 adjacent thereto (see FIG. The lead wire 7b drawn out to the wiring holding part 6 can come into contact with the coil 3b wound around the magnetic pole tooth part B3 when viewed from above in the rotation axis direction. Absent.
[0020]
As shown in a side view in FIG. 4, the lead wire 7b is locked to the notch 31 of the magnetic pole tooth part B3 and drawn in the direction of the wiring holding part 6 (not shown). 2 is not pulled out above the outermost circumferential surface 41 in the rotation axis direction of the coil 3b.
[0021]
Here, the notch portion formed in the magnetic pole tooth portion is formed by winding a coil with a line connecting the notch bottom portion on the magnetic pole tooth portion coupling portion side and the end portion on the magnetic pole tooth portion coupling portion side of the opening. If the angle θ formed with the center line passing through the rotation center of the magnetic pole tooth portion of the iron core is 90 ° or less, it is substantially V-shaped as shown in FIG. 5A or as shown in FIG. The opening 51 has a trapezoidal shape smaller than the cutout bottom 52, or protrudes radially inward to the end face on the side where the coil (not shown) is locked in the opening 53 as shown in FIG. You may make it the key shape in which the protrusion part 54 was provided.
[0022]
Further, as shown in FIG. 6, the protrusion 62 provided on the magnetic pole tooth portion 61 is radially inward of the magnetic pole tooth portion 61, opposite to the magnetic pole tooth coupling portion (not shown), that is, a rotating magnet (not shown). ) In the vicinity of the tip 63 on the side opposite to the tip 63, that is, a portion slightly outside in the radial direction from the tip 63, and larger in the circumferential direction on both sides near the tip 63 than the circumferential outermost surface 65 of the coil 64, and The circumferential width of the magnetic pole tooth portion 61 from the protrusion 62 to the tip portion 63 is formed to be equal to or greater than the circumferential width of the wound coil 64, and the lead wire of the coil 64 is It is good also as a latching | locking part. Further, the end face of the magnetic pole tooth portion 61 from the protruding portion 62 on the side where the coil 64 is not locked to the tip portion 63 is the same surface as the end surface 66 of the protruding portion 62 on the side where the coil 64 is not locked. You may make it the shape cut | disconnected so that only the end surface of the magnetic pole tooth part 61 from the protrusion part 62 of the stop side to the front-end | tip part 63 may be a little outside the circumferential direction outermost peripheral surface of the coil 64 wound.
[0023]
In the above-described embodiment, a rotating magnet (not shown) magnetized with a plurality of magnetic poles is provided on the inner side in the radial direction (rotation center O side) of the iron core 2 around which the coils 3a, 3b, 3c are wound. The inner rotor type structure is configured so as to be opposed to 2, as shown in FIG. 7 (a), on the radially outer side of the iron core around which the coil is wound (on the side opposite to the rotation center), It goes without saying that an outer rotor type configuration in which the rotating magnet is opposed to the iron core may be adopted. In FIG. 7A, since the shape of the plurality of magnetic pole tooth portions connected to the magnetic pole tooth coupling portion 71 is substantially the same, by describing one of the magnetic pole tooth portions 72, Change to the whole description. A plurality of magnetic pole tooth portions including the magnetic pole tooth coupling portion 71 and the magnetic pole tooth portion 72 constitute an iron core 73, and a coil is formed in each magnetic pole tooth portion of the iron core 73 into an odd layer with a predetermined number of turns by a predetermined procedure. The stator 74 is formed by being wound. A rotating magnet (not shown) magnetized with a plurality of magnetic poles is arranged on the outer side in the radial direction of the iron core 73 (on the side opposite to the rotation center O), that is, on the side opposite to the magnetic pole tooth coupling portion 71, and its inner peripheral surface is It faces the iron core 73. A notch 76 is provided in one of the protrusions 75 provided on both sides in the circumferential direction at the distal end of the magnetic pole tooth portion 72 in the radial direction, that is, on the side facing the rotating magnet (not shown). It has been. The coil 77 is started to be wound around the magnetic pole tooth portion 72 from the coil winding start 77 s and wound around the odd layer by a predetermined number of turns, and then the lead wire 77 a is locked to the notch portion 76 and is implanted in the magnetic pole tooth coupling portion 71. And a wiring holding portion 78 having a substantially T-shaped cross section, which is made of an insulating material such as a resin as shown in FIG. After being turned, the winding end line 77e is collected at the relay point 79. The lead wire 77a is locked by the notch 76, and, as in the above-described embodiment, the coil loosens or protrudes radially outward or inward from the upper surface of the magnetic pole tooth coupling portion 71 of the iron core 73, or the lead wire is This prevents contact with the top or bottom of the coil. The magnetic pole tooth part is connected by the magnetic pole tooth coupling part on the radially inner side (rotation center O side), and is opposed to the rotating magnet on the radially outer side of the magnetic pole tooth part, and the tip part of the magnetic pole tooth part facing the rotating magnet The shape of the notch provided in the protrusion at the tip of the magnetic pole tooth part is the same as that of the above-described embodiment (inner rotor type). Detailed description will be omitted here.
[0024]
As described above, according to the first embodiment, the coil wound around the magnetic pole tooth portion is engaged with the protrusion provided on the tip portion of the iron core facing the rotating magnet of the magnetic pole tooth portion. By forming the notched portion, the position of the coil wound around each magnetic pole tooth portion is accurately regulated without providing a member for regulating the coil position, and the coil wound in an aligned manner is loosened. It is possible to maintain the state of the aligned winding without causing the. And, by making the notch bottom part of the notch part outside in the circumferential direction from the outermost peripheral part of the wound coil, the lead wire drawn from the coil does not come into contact with the coil, It does not overlap on or under the coil, does not require a space in the direction of the rotation axis for the lead wire, and can be made thinner accordingly.
[0025]
【The invention's effect】
As described above, the motor of the present invention includes a plurality of magnetic pole tooth portions and a magnetic pole tooth coupling portion that connects the magnetic pole tooth portions, and the periphery of the tip portion on the side of each magnetic pole tooth portion facing the radial rotating magnet. Protrusions are provided on both sides in the direction, and an iron core in which a notch is formed in one of the projecting parts on both sides is wound around each magnetic pole tooth part, and the lead wire is And a stator formed of a coil locked to a notch formed in the portion.
[0026]
By adopting such a motor configuration, it is possible to accurately regulate the position of the coil wound around each magnetic pole tooth portion without arranging a member for regulating the position of the coil. It is possible to maintain the state of the aligned winding without causing the coil to be loosened, and further, the lead wire of the coil drawn out from the coil wound around each magnetic pole tooth portion does not contact the coil In addition, since the coil does not overlap with the coil, there is no need for a space in the direction of the rotation axis for the lead wire, and the motor can be thinned.
[Brief description of the drawings]
FIG. 1A is a plan view showing a stator composed of an iron core and a coil according to Embodiment 1 of the present invention, and FIG. FIG. 2 is a plan view for explaining the shape of the magnetic pole tooth portion in the first embodiment of the present invention. FIG. 3 is an enlarged view of a portion A in FIG. 1 of the first embodiment of the present invention. 3 is a side view of FIG. 3 according to the first embodiment of the present invention. FIG. 5 (a) is a partial plan view showing another example of the shape of the notch according to the first embodiment of the present invention. FIG. 6 (c) is a partial plan view showing another example of the shape of the notch in the first embodiment of the present invention. FIG. 6 is a partial plan view showing another example of the shape of the notch in the first embodiment of the present invention. FIG. 7 (a) is a partial plan view showing an example in which the notch in the first embodiment of the present invention has a cut shape. The top view (b) which shows the other example of the stator comprised with the iron core and coil in Embodiment 1 of this invention is for showing the schematic shape of the wiring holding part in the other example of Embodiment 1 of this invention. FIG. 8 is a plan view showing a conventional iron core used in a thin motor. FIG. 9 is a partially enlarged view showing a lead wire process of a coil wound around a conventional magnetic pole tooth portion. Schematic side view of 9 [Explanation of symbols]
1,25,71 Magnetic pole tooth coupling portion 2,73 Iron cores 3a, 3b, 3c, 64, 77 Coils 3as, 3bs, 3cs, 77s Coil winding start 3ae, 3be, 3ce, 77e Winding end wire 4, 74 Stator 5, 79 Relay points 6, 78 Wiring holding portions 7a, 7b, 7c, 77a Lead wires 8, 23, 62, 75 Protruding portions 9, 24, 31, 76 Notched portion 21 Iron cores 22, 61, 72, A1, A2, A3 , B1, B2, B3, C1, C2, C3
Magnetic pole tooth part 23a Front end face 26, 32, 52 Notch bottom part 27, 51, 53 Opening part 28 End part 29 Line 30 Center line 33, 41, 65 Outermost peripheral surface 54 Projection part 63 Front end part 66 End face O Rotation center θ Angle

Claims (1)

A stator formed by winding a coil on an iron core in which thin cores are laminated, and a rotor composed of a rotating magnet facing the stator, and the iron core includes a plurality of magnetic pole teeth and the magnetic pole teeth. Magnetic pole teeth coupling portions to be connected, and at the tip portions of the respective magnetic pole tooth portions facing the rotor, protrusions are provided on both sides in the circumferential direction, and At least one of the notches is formed ,
A wiring holding part formed of an insulating material on the iron core and provided on the magnetic pole tooth coupling part.
The coil is advanced from the magnetic pole tooth portion toward the tip end side from the magnetic pole tooth coupling portion side,
The motor is characterized in that the lead wire of the coil is folded back through the notch and is locked to the wiring holding part .

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