JPS63107450A - Motor - Google Patents

Abstract

PURPOSE:To improve the positioning precision, by providing a magnetic sensing element to the fitting piece section bent and integrally formed to a print substrate. CONSTITUTION:Into the centre of a disc-shaped stator yoke 11 a bearing housing 12 is penetrated to be fixed. Inside this yoke 11 multiple stator coils 13 are circularly arranged and fixed. A print substrate 14 is also fixed. Through a pair of bearings 18 a rotating shaft 17 of a rotor 19 is supported, of which a magnet 22 of a rotor yoke 21 is arranged opposite to the abovementioned substrate 14. A field magnetizing surface 22a and a frequency generating magnetizing surface 22b are formed to this magnet 22, while to the abovementioned substrate 14 its coil pattern 23 is formed. To the opposite section of the abovementioned field magnetizing surface 22a an integrally bent and formed rectangular fitting piece section 24 is provided, to which a Hall element 26, a magnetic sensing element, is fitted. A holder of another body is thus dispensed with, so that the trouble arising from it can be eliminated.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a motor in which a rotor magnet is opposed to a printed circuit board.

(Prior Art) As shown in FIG. 7, this type of axial gap type motor has a printed circuit board 2 attached to the stator yoke 1, and the printed circuit board 2 facing the rotor magnet 3. There is one in which a magnetic detection cable 5 such as a Hall element is provided on the printed circuit board 2 in the following manner in order to detect the rotational position of the magnet. That is, an opening 6 is formed in a portion of the printed circuit board 2 facing the field magnetized surface 3a of the rotor magnet 3, and a holder 7 is inserted into the opening 6.
is attached so as to protrude toward the stator yoke 1 side, and the magnetic detection element 5 is supported by the holder 7, so that the printed circuit board 2 and the rotor magnet 3 are brought close to each other. As a result, the frequency power generation magnetized surface formed in the outer circumferential annular region of the field celadon surface 3a of the rotor magnet 3 and the frequency power generation coil pattern correspondingly formed on the printed circuit board 2 are brought closer to each other. It is designed to increase the output by keeping it in the same state.

(Problems to be Solved by the Invention) However, in the conventional configuration described in Section 2, the magnetic detection element 5 is attached to the printed circuit board 2 via the holder 7, so the work of attaching the magnetic detection element 5 is relatively difficult. It's a hassle. Furthermore, there is a problem in that the mounting error of the holder 7 tends to cause a decrease in the positional accuracy of the magnetic detection element 5, and thus a decrease in detection accuracy.

The present invention aims to solve these problems,
Therefore, the object is to provide a motor which can simplify the work of attaching a magnetic detection element and improve the positional accuracy of the magnetic detection element.

[Structure of the Invention] (Means for Solving the Problems) The motor of the present invention includes a mounting piece that is inclined in a direction opposite to the rotor magnet, and is integrated into a portion of the printed circuit board that faces the rotor magnet. Along with forming a bend,
A magnetic detection element is provided on this mounting piece.

(Function) Since the magnetic detection element is provided on the mounting piece that is bent and formed integrally with the printed circuit board, the conventional separate holder is not required, and the problems caused by the holder can be solved.

(Example) Hereinafter, a first example of the present invention will be described based on FIGS. 1 to 3. 11 is a stator yoke formed in a dish shape;
A bearing housing 12 is fixed to the center thereof in a penetrating state. A plurality of stator coils 13 are arranged and fixed in an annular manner on the inner surface of the stator yoke 11.

14 is a printed circuit board fixed to the stator yoke 11;
An opening 15 (
(see FIG. 2), and as shown in FIG. 3, the end face of the stator coil 13 is located within the opening 15. In the stator 16 configured as described above, 17 is a rotating shaft of the rotor 19 supported via a pair of bearings 18 in the bearing housing 12, and a rotor yoke 21 is fixed to the end of the rotor 19 via a boss 2θ. A rotor magnet 22 fixed to the rotor yoke 21 faces the printed circuit board 14 with a slight gap therebetween. A field magnetized surface 22a is formed in an annular region of the rotor magnet 22 facing the stator coil 13, and a multipolar magnetized region is formed on the outer peripheral side of this field magnetized surface 22a. A magnetized surface 22b for frequency power generation is formed. on the other hand,
The printed circuit board 14 has a patterned surface on the side facing the rotor magnet 22, and a frequency power generation coil pattern 23 formed there by printed wiring means faces the frequency power generation magnetized surface 22b. In this case, the gap between the frequency power generation coil pattern 23 and the celadon surface 22b is set to, for example, about 0.3 nua. 1 and 2, reference numeral 24 indicates the field magnetized surface 2 of the rotor magnet 22 of the printed circuit board 14.
It is a rectangular mounting piece that is integrally bent at a portion facing the rotor magnet 2a, and is inclined toward the side opposite to the rotor magnet 22. Specifically, it is formed as follows. That is, as shown in FIG. 2, a U-shaped groove 25 is formed in order to separate the remaining three sides from the printed circuit board 14 except for one outer side of the four sides of the mounting piece 24. 1 on the outer circumference side
This portion is bent with the side portion as the proximal side bending portion 24a. In this embodiment, the base material of the printed circuit board 14 is made of paper abrasive material, and the fiber direction of this base material (direction of arrow A in FIG. 2)
and the proximal side bending portion 24a are made parallel to each other to facilitate bending. The bending of the attachment piece 24 is carried out by heating and softening the proximal bent portion 24a of the attachment piece 24 using heat during soldering, such as reflow soldering.

In order to provide, for example, three Hall elements 26 as magnetic detection elements on the mounting piece 24 bent in this way,
Three fitting holes 27 (see Fig. 1) are formed, and each fitting hole 2
A Hall element 26 is fitted into each of the holes 7, thereby causing the Hall element 26 to face the field magnetized surface 22a. Then, lands are formed in the vicinity of each fitting hole 27 on the pattern surface (field magnetized surface 22a side) of the mounting piece 24, and the terminals of the Hall element 26 are reflowed onto each of these lands. Soldering is done by soldering. Note that 28 is a spring for regulating the position of the rotating shaft 17.

According to the first embodiment, the mounting piece 24 is integrally bent and formed on the printed circuit board 14 so as to be inclined on the side opposite to the rotor magnet 22, and the distance between the mounting piece 24 and the rotor magnet 22 is Since the Hall element 26 is directly attached to the mounting piece 24 without using a holder after expanding the Hall element 26, the work of attaching the Hall element 26 is simplified compared to the conventional method in which the Hall element 26 is attached via a holder. This not only contributes to automation of assembly, but also improves the positional accuracy of the Hall cable 26 and improves detection accuracy. Moreover, even when the gap between the printed circuit board 14 and the rotor magnet 22 is reduced as in this embodiment, the problem of contact between the conventional holder and the rotor magnet is solved, and in addition, the mounting piece on which the Hall element 26 is provided can be removed. Reference numeral 24 designates a part of the printed circuit board 14, and a land is formed on this mounting piece 14, and the terminal of the Hall element 26 can be soldered to the land. Compared to the conventional structure shown in FIG. 1, it can be moved away from the rotor magnet 22, and the soldering portion can also be prevented from coming into contact with the rotor magnet 22.

In the above embodiment, the base material of the printed circuit board 14 is made of paper material to reduce the cost of the printed circuit board 14; 24a, the proximal side bending portion 24a can be easily bent.

Furthermore, since the fitting hole 27 is formed in the mounting piece 14 and the Hall cable 26 is fitted into the fitting hole 27, the positioning of the Hall element 26 is sometimes difficult when soldering the terminal of the Hall element 26. This can be done through the fitting hole 27, and soldering can also be done to prevent the Hall element 26 from tilting later.

In the first embodiment, the proximal bent portion 24a of the mounting piece 24 is bent by soldering by heating and softening it with the heat of time. However, the present invention is not limited to this. The second embodiment of the present invention shown in FIGS. 4 and 5 may be formed in the same manner. That is, in the first embodiment, the groove 25 is punched out around the mounting piece 24 at the same time as the printed circuit board 14 is punched out, but in the second embodiment, the groove 25 is not formed and the printed circuit board 14 is punched out. During processing (for example, bush pack manufacturing method), three sides of the attachment piece 24 are simultaneously sheared, and the remaining side (!!end side bent portion 24a) is press-formed by bending.

FIG. 6 shows a third embodiment of the present invention. In this embodiment, an insertion hole is formed at the tip of the mounting piece 24 in order to prevent the bending angle of the mounting piece 24 from decreasing due to springback or the like. For example, a screw 28 is inserted as a fixing device into the stator yoke 11, and the tip of this screw 28 is threaded into the stator yoke 11. In this case, if the screw 28 is made of a non-magnetic material,
This screw 28 does not cause disturbance of the magnetic flux distribution, and the second problem of magnetic properties can be avoided.

In each of the embodiments described above, the mounting piece 24 is formed into a rectangular shape, but the present invention can be modified in various ways without departing from the scope of the invention, such as a semicircular shape.

[Effects of the Invention] As is clear from the description below, the present invention provides a magnetic detection element on a mounting piece that is integrally bent on a printed circuit board, so the conventional holder is no longer necessary. Become,
This has the excellent effect of simplifying the installation work of the magnetic detection element and improving the positional accuracy of the magnetic detection element.

[Brief explanation of the drawing]

1 to 3 show a first embodiment of the present invention,
Figure 1 is a cross-sectional view taken along the line 1-1 in Figure 2, Figure 2 is a bottom view of the printed circuit board with the rotor removed, and Figure 3 is a cross-sectional view taken along the line ■-■ in Figure 2. 4 is a view corresponding to FIG. 1 showing a second embodiment of the present invention, FIG. 5 is a view corresponding to FIG. 2, and FIG. 6 is a view corresponding to FIG. 1 showing a third embodiment of the present invention. FIG. 7 is a diagram corresponding to FIG. 1 showing a conventional example. In the drawings, 14 is a printed circuit board, 22 is a rotor magnet, 24 is a mounting piece, 24a is a proximal bent portion, 26 is a Hall element (magnetic detection element), and 27 is a fitting hole.

Claims (3)

[Claims] 1. A rotor magnet is arranged to face a printed circuit board, and a mounting piece is formed integrally with a portion of the printed circuit board that faces the rotor magnet, and is inclined toward the side opposite to the rotor magnet;
A motor comprising a magnetic detection element provided on the mounting piece. 2. 2. The motor according to claim 1, wherein the base material of the printed circuit board is made of a paper material, and the bent portion on the proximal end side of the mounting piece portion is parallel to the fiber direction of the base material. 3. Claim 1, characterized in that the mounting piece portion is formed with a fitting hole for fitting the magnetic detection element.
The motor according to item 1 or item 2.