JPH051967Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) The present invention relates to an armature core used in small electric motors such as laminated core motors, and particularly relates to an armature core that prevents poor insulation in the winding portion. .

(Prior Art) As shown in FIG. 11, an armature core used in a small electric motor such as a laminated core motor has a plurality of ring-shaped pieces having salient poles 1c and grooves for windings. The above-mentioned salient pole of the laminated core 1 is made by laminating 1 g of magnetic plates (for example, silicon steel plates) and fixing them by caulking with rivets 3, etc., and providing a mounting hole 1b for inserting a fixing screw 6 into the motor body etc. An armature core 200 in which a winding 7 is wound around 1c is known.

Figure 12 shows an example of a laminated core type motor in which an armature core with such a shape is used. Brushless motor 11 installed on the 12 side
Here is an example.

This brushless motor 11 is normally provided integrally with a fixed drum 12, and has an armature core 20.
0 is directly attached to the stationary drum 12 by a fixing screw 6 inserted through the attachment hole 1b.

In the figure, reference numeral 19 indicates a rotating shaft of a rotating drum (not shown) of the head drum, 13 indicates a cup-shaped rotor case fixed to a preload boss 20 fixed to the rotating shaft 19 via a mounting screw 18, and 15 indicates a rotor case 13. , i.e., the armature core 200
16 is an FG magnet for frequency power generation to control the rotational speed of the motor 11, and 14 is a wiring board on which a FG pattern for frequency power generation is printed. show.

By the way, the armature core 2 having the shape shown in FIG.
When the laminated core motor 11 having a diameter of 0.00 mm is attached to the head drum of a magnetic recording/reproducing device as shown in FIG.
Particularly in the case of small devices such as VTRs and digital audio tapes (DATs), as the devices become smaller, motors are required to be smaller, and the armature core needs to be smaller in diameter. For this reason, with a smaller diameter armature core, it is not possible to secure a space between the mounting hole and the winding, and with an even smaller diameter armature core, the width of the annular part is narrow, making it difficult to provide space for the mounting hole. As shown in FIG. 13, there is also an example in which the mounting hole 1b of the laminated core 1 is formed in the shape of a slot to secure the engagement part with the fixing screw due to lack of space to provide the mounting hole 1b of the laminated core 1 in the shape of a slotted hole. It is being

(Problem to be solved by the invention) The laminated core 1 constituting the core part of the armature core is
In order to prevent poor insulation in the windings, insulation painting is applied as shown in Figure 14 before winding the windings, but in order to prevent paint from entering the mounting holes 1b during painting, 1b, the portions located on the outer circumferential side of the protective cap 24, that is, the salient pole 1c, the winding groove 1e, and the auxiliary pole 1d.
Insulating coating (hatched area in the figure) is applied to each surface part of the core using electrostatic coating, etc. However, in the case of a small diameter core, the mounting hole 1b is provided close to the edge part 1f of the core. During painting, the attachment hole 1b avoidance portion of the protective cap 24 may reach close to the edge portion 1f of the core. Therefore, when the protective cap 24 is removed after insulation coating, the paint on the edge portion 1f of the core 1 is likely to peel off together with the insulation paint adhered to the outer peripheral surface of the protective cap 24, and the mounting hole 1
The metal base of the edge portion 1f near b may become exposed due to peeling of the insulating paint.

Therefore, as shown in FIG. 15, when the winding 7 is tightly wound around the salient pole 1c of the laminated core by the winding machine and reaches the edge part 1f of the laminated core 1, the In the edge portion 1f and its vicinity, insulation between the winding 7 and the laminated core 1 cannot be ensured due to peeling of the insulating paint, resulting in a situation where insulation failure is likely to occur, which is a problem.

In addition, when fixing the armature core 200 to the motor body or the lower drum of the head drum mentioned above, the head of the fixing screw 6 is in close contact with the surface of the core 1, so that if the winding 7 shifts inward, This was a problem because the winding and the head of the screw 6 could come into contact, causing poor insulation.

The present invention has been made to solve the problems caused by the above-mentioned conventional techniques, and aims to prevent the above-mentioned insulation defects in small-diameter armature cores.

(Means for solving the problems) The present invention provides the following means to achieve the above object.

A plurality of magnetic plates formed in an annular shape having a salient pole and a groove for the winding are laminated, and a winding is wound around the salient pole of a laminated core having a mounting hole provided near the groove for the winding. In the armature core, generally ring-shaped flat plates with through holes formed in alignment with the mounting holes are stacked and fixed on both upper and lower surfaces of the laminated core in the laminating direction, and the salient poles and grooves of the laminated core are fixed. An insulating coating is integrally applied to the surface and the outer peripheral surface of the flat plate.

(Function) By overlapping flat plates on both the upper and lower surfaces of the laminated core and applying an integral insulation coating, the coating on the surface of the laminated core is prevented from peeling off when the protective cap used for insulation coating is removed, and the winding This prevents insulation failure between the winding wire and the laminated core during winding.

In addition, when the armature core is attached to a base such as a motor body, the head of the fixing screw is located on a flat plate, so the distance between the screw head and the winding is equal to the thickness of the flat plate, and the screw Contact between the head and the winding is avoided.

(Example) Hereinafter, an example of the present invention will be described in detail based on the drawings.

1 and 2, a laminated core 1 forming the core part of the armature core according to the present invention has a plurality of salient poles 1c and a commutative pole 1d that protrude radially along the outer peripheral surface, and a salient pole. It is formed by laminating a plurality of annularly formed magnetic plates (for example, silicon steel plates) 1g having a winding groove 1e located in the rib portion of the laminated core 1. A plurality of mounting holes 1b for engaging fixing screws are provided near 1e. The figure shows an example in which the groove is formed in the shape of a slot. In addition, each magnetic plate 1 is provided in the annular portion of the laminated core 1.
g A hole 1a for inserting a rivet 3 for fixing the lamination is bored.

In the present invention, the laminated core 1 formed in this way
After overlapping round-shaped flat plates 2 with through holes formed in the upper and lower sides in the stacking direction that correspond to and have the same position and shape as the mounting hole 1b and the rivet hole 1a, respectively, the flat plates 2 are laminated. Each magnetic plate 1 of core 1
It is caulked and fixed by the rivet 3 together with g. The material of the flat plate 2 is the same as that of the magnetic plate 1g.
Alternatively, a material that can be coated with insulation, such as a non-ferrous metal type, is suitable, but a hard resin that can be coated with insulation may also be used.

As shown in FIGS. 3 and 4, a laminated core 1 is formed by overlapping and fixing flat plates on the upper and lower surfaces in the laminating direction.
After covering the upper and lower surfaces of the cap with a substantially cylindrical protective cap 4 having an outer diameter smaller than the outer circumferential diameter of the flat plate 2 and having an outer diameter located on the outer circumferential side from the position of the through hole 2b of the flat plate 2 at the time of installation. An insulating coating 5 (indicated by mesh lines in the figure) is applied to the entire surface of the laminated core 1 outside the protective cap 4 and the outer peripheral surface of the flat plate 2.

In the present invention, as described above, the ring-shaped flat plates 2 are stacked and fixed on top and bottom of the laminated core 1, and the laminated core 1
Since the insulation coating was applied at the same time, the insulation coating was applied to the outer circumferential surface of the flat plate 2 so as to be continuous with the edge part 1f of the laminated core 1. Therefore, as shown in FIG. When installing, screw 6
Between the head of the head and the upper surface of the flat plate 2 and the winding part,
They are separated by the thickness of the flat plate 2. Therefore, when the winding 7 is wound to form the armature core 100 as shown in FIG. 6, poor insulation between the winding 7 and the metal base of the laminated core 1 or the head of the screw 6 may occur. Prevented.

Note that the thickness of the flat plate should be thicker than the sum of the diameter of the winding and the thickness of the insulation coating.
Approximately 0.5mm to 1.0mm is appropriate.

In addition, according to the present invention in FIGS. 3 to 6, in order to apply insulation coating (shaded area in the figure) with the flat plate 2 superimposed on the laminated core 1, the protective cap 4 is removed after coating. Even if the insulating coating on the flat plate 2 around the protective cap 4 peels off together with the paint adhered to the outer circumferential surface of the protective cap 4, the coating on the outer circumferential surface of the flat plate 2 and the coating on the edge portion 1f of the laminated core 1 will also peel off. There is no problem, and the insulation between the laminated core 1 and the winding 7 is ensured, and poor insulation of the winding portion is prevented.

In addition, although the above embodiment shows an example in which the salient poles are applied to an armature core provided on the outer circumferential side of the core, the same applies to an armature core where salient poles are provided on the inner circumferential side of the core. Applicable.

FIG. 7 shows another embodiment of the present invention, and shows an application example where the laminated core 1 does not have a commutating pole. In addition, this example shows an example in which the mounting holes for mounting fixing screws and the through holes 2b of the flat plate 2 overlapping the upper and lower surfaces of the laminated core 1 are provided in the form of open holes. Note that the shaded areas in the figure indicate the insulation coating locations.

8 to 10 show still another embodiment of the present invention, showing a modified example of a flat plate shape superimposed on both upper and lower surfaces of the laminated core.

In small diameter armature cores, the space between the windings is an important factor in the direction of rotation of the motor. For this reason, especially for small-diameter cores, as shown in FIG. 8, the outer circumferential shape of the flat plate 2 superimposed on both the upper and lower surfaces of the laminated core 1 in the laminating direction is recessed inward so as to avoid the position of the winding groove 1e. It is better to form a star shape in which only the fixing screw mounting part protrudes, since the winding 7
Since the position of the flat plate 2 is not restricted by the outer periphery of the flat plate 2, the winding space can be larger than that of the annular flat plate shown in FIGS. 1 to 6.

In addition, as shown in Figure 8, the insulating coating at this time is applied to the shaded area in the figure, the outer peripheral surface of the flat plate 2, and the salient pole 1.
c, applied to the entire surface of the commutating electrode 1d and the groove portion 1e.

In this way, in the embodiments shown in FIGS. 8 to 10, the head of the fixing screw can be positioned in the plane of the flat plate 2 while effectively securing the winding space. The distance from the winding can be secured by the thickness of the flat plate 2, and poor insulation due to contact between the screw head and the winding can be prevented. In addition, if the protective cap used during painting is provided in the same shape as the star-shaped flat plate, the insulation coating on the laminated core side and the outer peripheral surface of the flat plate can be applied reliably, and the insulation between the winding and the laminated core edge can also be ensured. can.

(Effects of the invention) As explained above, in the present invention, flat plates are superimposed and fixed on both upper and lower surfaces in the lamination direction of the laminated core that forms the core part of the armature core, and the salient poles (and complementary poles) of the laminated core are fixed. By applying insulating coating to the surface of the winding groove and the outer circumferential surface of the flat plate, an insulating coating wall is formed on the outer circumferential surface of the flat plate over the edge of the laminated core, so that the edge of the winding and laminated core Insulation failures caused by contact with parts are prevented.

In addition, when tightening the fixing screws for attaching and fixing the armature core to the motor body, the head drum of a magnetic recording device, etc., the head of the fixing screw is located on the surface of the flat plate due to the interposition of the flat plate. There is no risk of damaging the painted part, the insulation of the edge part of the laminated core is ensured, and no insulation failure occurs during winding. In addition, since there is a flat plate between the protective cap used during insulation painting and the laminated core, the insulation paint on the core side will not peel off when the protective cap is removed after painting, and the core edge and core surface will not peel off. insulation is ensured. For this reason,
The flat plate can be formed into a star shape in which only the winding portion is concave inward, and a sufficient winding space can be secured.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of the core configuration of an armature core representing an embodiment of the present invention, FIG. 2 is a schematic sectional view taken along the line shown in FIG. 1, and FIG. 3 is a core portion of an armature core according to the present invention. A cross-sectional view of the core part of the armature core and the protective cap for insulating coating, showing the state at the time of insulating coating.
Fig. 4 is a top view of the core portion of the armature core, Fig. 5 is a schematic cross-sectional view taken along the line of Fig. 4 showing the armature core according to the present invention when fixing screws are attached, and Fig. 6 is a schematic sectional view taken along the line of Fig. 6. FIG. 7 is a top view of the armature core showing another embodiment of the present invention, and FIG. 8 is a top view of the armature core showing another embodiment of the present invention. FIG. 9 is a top view of the core part of the child core, FIG. 9 is a partially enlarged view, FIG. 10 is a top view of the armature core, FIG. 11 is a perspective view of the armature core showing a conventional example, and FIG. 13 is a perspective view of the core portion of an armature core showing a conventional example, FIG. 14 is a top view of the same, and FIG. 15 is a top view of an armature core showing a conventional example. It is a diagram. 1... Laminated core, 1b... Mounting hole, 1c... Salient pole, 1e... Groove for winding, 1g... Magnetic plate, 2...
...flat plate, 2b...through hole, 5...insulating coating, 7...
Winding, 100...armature core.

Claims (1)

[Scope of utility model registration request] A plurality of magnetic plates formed in an annular shape having a salient pole and a groove for the winding are laminated, and a winding is wound around the salient pole of a laminated core having a mounting hole provided near the groove for the winding. In the armature core, generally ring-shaped flat plates with through holes formed in alignment with the mounting holes are stacked and fixed on both upper and lower surfaces of the laminated core in the laminating direction, and the salient poles and grooves of the laminated core are fixed. An armature core whose surface and the outer peripheral surface of the above-mentioned flat plate are integrally coated with an insulating coating.