JPS58182465A - Brushless motor - Google Patents

Abstract

PURPOSE:To set up a stator core onto a substrate with excellent positioning accuracy by inserting a spring pin into the pin holes of the stator core, a spacer and the substrate and caulking both end sections of the pin. CONSTITUTION:A plurality of the pin holes 10 are bored at the common positions of the stator core 8, the spacer 7 and the substrate 6. The spring pins 11 are inserted into the pin holes 10 of these stator core 8, spacer 7 and substrate 6. Both end sections of the spring pins 11 are cut, but three members through crushing plastic deformation in case of the cutting are caulked integrally, and the stator core 8 is set up onto the substrate 6. Accordingly, the spring pins 11 are pushed and fast stuck to the inner circumferential surfaces of the pin holes 10 by the spring action of the spring pins 11, and positioning accuracy is further improved.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to means for positioning and fixing a stator core or a stator yoke on a substrate in a brushless motor.

For example, inside the cylindrical part of a cup-shaped rotor yoke,
In a brushless printer, the stator core, which faces the attached rotor magnet through a radial gap, is mounted on a substrate via a spacer.

Conventionally, when attaching the stator core to the substrate, adhesive is applied to each joint surface to fix it. However, the stator core and the board need to be aligned in order to mount detection elements etc. on the board, and in this case, it is necessary to use a 1-positioning jig and tool, which is extremely troublesome to manufacture. There were also 6 and 9 problems with varying accuracy.

Figure 1 is a front side view showing a main part of an example of a conventional device in cross section.

lti rotating shaft, 2 is a bearing, 3 is a housing, 4 is a cup-shaped rotor yoke, cylindrical part of the 4aFi rotor yoke, S is a rotor magnet, 6 is a substrate, 711t spanner, 8 is a stator core, and 9 is a stator coil.

The positions of the stator coil 9 and the detection element (not shown) are aligned, and the stator core, the spacer, and the board 6 are joined individually and with jigs, which requires too much time and effort to be done efficiently. Nakatsu nine.

One object of the present invention is to provide a brushless motor that overcomes the problems of conventional devices.

That is, in the present invention, a plurality of pin holes are provided at a common location in the stator core, spacer, and substrate, and spring pins are inserted into the pin holes of the stator core, spacer, and substrate, and the spring pins are inserted into the pin holes. Both ends are caulked by crushing plastic deformation during cutting, and the stator core is attached to the substrate.

FIG. 2 is a cross-sectional view showing the essential parts of an embodiment of the present invention, and FIG. 3 is a detailed view of the caulking portion thereof.

In each drawing, the same reference numerals indicate four or four monk parts.

A plurality of pin holes 10 (in the figure, one pin hole 10 is shown in each case) are bored in common locations between the stator core 8, the spacer 7, and the substrate 6.

Those stator cores8. Space? 7. Base [617] Insert the sedge ring pin 11 into the bottle hole 10.

-t, both ends of the spring pin 11 are cut, and the ends are swaged together by crushing plastic deformation at the time of cutting, and the stator core 8 is mounted on the substrate 6.

As shown in FIG. 3, the cutting position dimension t of the nine spring pins 11 protruding from the shoulder surfaces of the stator core 8 and the board 6
According to experiments, approximately half of the inner diameter d of the bottle hole IO from the end surfaces of the stator core 8 and the substrate 6 is optimal.

Therefore, it is desirable that the inner diameter d of the pin hole 10 is slightly smaller than the outer diameter of the spring pin U in the normal state (spring pin not inserted into the pin hole 10). Due to the spring action of the sedge ring pin 11, the sedge ring pin 11 is tightly pressed against the inner circumferential surface of the bottle hole 10, and the positioning accuracy is further improved.

FIG. 4 is a side view showing the entire assembled structure of this embodiment and showing the main parts in cross section.

Figure Is5 is a sectional view of another embodiment of the present invention.

This is for when the strength of the board 6 is insufficient, and a non-conductive ring-shaped reinforcing seat 1 is attached to the end of the board 6 of the ring pin 11.
2t-The end portion of the spring pin 11 may be caulked.

FIG. 6 is a cross-sectional view showing essential parts of still another embodiment of the present invention. This is an embodiment of the present invention in a disc-shaped brushless motor having an axial gap.

That is, a disk-shaped bluff motor in which a rotor yoke 14 having a rotor magnet 5 therein and a stator yoke 13 having a stator coil 9 therein, which faces the rotor magnet 5 via 9s in the axial direction, are both disk-shaped. This is an example of a similar implementation. However, in this case, since the spacer 7 for the stator coil 9 is not required between the stator yoke 13 and the board 6, the stator yoke L3 can be mounted directly on the board 6.

By the way, 1. The reason why the Sugering pin 11 is used in the present invention is as follows: (1) When the diameter d of the bottle hole IO is set smaller than the outer diameter of the Sugering pin 11 in the normal state, the outer circumferential surface of the Sugering pin 11 becomes a spring. Stator core 8 (or stator yoke 1)
3) and the inner circumferential surface of the bottle hole 10 of the substrate 6 are press-fitted, so that the positioning accuracy between the stator core 8 and the substrate 6 is greatly improved.

@Sderingpin/ll#i Because it is cylindrical, the amount of plastic deformation (flattening amount) during cutting is greater than that of a solid pin, and strong caulking can be achieved.

It is from.

Since the present invention has such a configuration, the stator core 8
In mounting the stator yoke (or stator yoke 13) on the base &6, positioning and stacking are improved and manufacturing becomes easier.

[Brief explanation of the drawing]

Fig. 1 is a side sectional view of a conventional device, Fig. 2 is a sectional view of essential parts of an embodiment of the present invention, Fig. 3 is a detailed view of the caulking part, and Fig. 4 is a sectional view showing the overall configuration. Figure 5 is a sectional side view of a main part of another embodiment of the present invention, and Figure @6 is a side sectional view showing a main part of still another embodiment of the invention. 1...Rotating shaft, 2...Bearing, 3...How song. 4...Cup-shaped rotor yoke. 4a... Cylindrical part of the coater. 5. Rotor magnet. 6... Board. 7... Stator core, 9... Yonago coil, 10... Bottle hole, 11... Tin ring pin. 12...Non-conductive ring-shaped reinforcement seat, 13...r
Isk-shaped stator yoke, 14...r Isk-shaped rotor yoke. Applicant's agent Kiyoshi Inomata) l-yl Figure 2 Figure '43 Figure 44 Figure 5, 5 Sono

Claims (1)

[Claims] 1. A brushless motor in which a stator core or stator yoke is mounted on a substrate and is mounted inside a rotor yoke and faces a rotor magnet through a gap in the radial or axial direction. A plurality of bottle holes are provided in a common location of the substrate, and a sgelling bottle is inserted into the bottle holes of the stator core or the stator 1 and the substrate,
A brushless motor characterized in that the stator yoke is attached to the stator core 4 and the stator yoke on the substrate by caulking both ends of the Snow cylinder pin by crushing deformation during cutting. 2. The brushless motor according to claim 1, wherein the diameter of the bottle hole is slightly smaller than the outer diameter of the sgelling bottle in a normal state. 3. The brushless motor according to claim 1, wherein the cut point of the nine springs protruding from the end face of the stator core or stator yoke and the substrate is approximately half the inner diameter of the bottle hole from the end face. 4. Su! 9. The brushless motor according to claim 1, wherein a non-conductive ring-shaped reinforcing seat is inserted into the inner part of the base plate, and the bottom part of the sedge ring bottle is caulked.