JPH0218688Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a signal generator used as a stator of an inductor rotating signal generator.

[Summary of the invention] The invention provides a signal generator used as a stator of an inductor-rotating signal generator, which has a salient pole part around which a signal generator coil is wound, and a magnet contact part that contacts a permanent magnet. By configuring the iron core by the first and second core forming members and arranging the salient pole forming parts of both core forming members so as to overlap, the thickness of the magnet contacting part can be reduced and the salient pole part This allows the cross-sectional area to be increased.

[Prior Art] When a signal generated at a predetermined rotation angle position of a rotating body is required, for example, when obtaining a signal that determines the ignition timing of an ignition system for an internal combustion engine, an inductor-type rotor and a magnetic path are used. An inductor rotating type signal generator is often used, which is composed of a signal generator having a permanent magnet in the middle.

Figure 4 shows the basic configuration of a conventionally used signal generator. In the figure, 1 is a plate-shaped permanent magnet magnetized in the thickness direction, and 2 is opposed to an inductor type rotor (not shown). Salient pole part 2A and permanent magnet 1
3 is a yoke member coupled to the other magnetic pole surface of the permanent magnet 1. The yoke member 3 consists of a magnet abutting part 3A that comes into contact with the other magnetic pole surface of the magnet 1, and a substrate part 3B that is bent at right angles from the base end of the magnet abutting part 3A toward the salient pole part 2A. 1, the iron core 2, and the magnet contact portion 3A of the yoke member are integrated by a frame (not shown). And salient pole part 2A of iron core 2
A signal generating coil (not shown) is wound around the coil.

The above-mentioned signal generator S is installed near the rotor having an inductor, and the magnetic pole part 2 at the tip of the salient pole part 2A
A1 and the end surface 3B1 of the base plate portion 3B of the yoke member 3 are opposed to the inductor magnetic pole portion of the rotor through a predetermined gap. When the rotor rotates and its inductor magnetic pole portion faces the salient pole portion 2A, the permanent magnet 1
A large magnetic flux flows from the iron core 2 to the magnetic path returning to the permanent magnet 1 through the magnet contact portion 2B, the salient pole portion 2A, the inductor (not shown), the base plate portion 3B of the yoke portion 3, and the magnet contact portion 3A. , due to the magnetic flux change at this time, the salient pole part 2A
A signal voltage is induced in the signal generator coil wound around the

[Problems to be Solved by the Invention] In the above-mentioned conventional signal generator, the iron core 2 is made of a rectangular or square iron plate in which a notch is made in a part to form a salient pole portion 2A. Therefore, in order to secure the cross-sectional area of the salient pole part 2A, the iron core 2
It is necessary to use a fairly thick iron plate to form the . Therefore, there was a problem in that the thickness L of the laminate of the magnet 1 and the magnet contact portion 2B of the iron core 2 increased, and the axial dimension of the signal generator increased.

Further, in the conventional signal generator described above, since the void space 2B1 left after cutting and raising the salient pole portion 2A is formed in the magnet contact portion 2B of the iron core 2, the magnet contact portion 2B is
There was a problem in that the area of B became smaller and the ability to focus the effective magnetic flux was reduced.

In order to prevent the magnetic flux concentration ability from decreasing,
As shown in FIG.
A method has been proposed in which the area of B is prevented from decreasing. However, in this case as well, it is unavoidable that the thickness of the iron plate constituting the iron core increases in order to secure the cross-sectional area of the salient pole portion 2A, and the thickness dimension L of the laminate of the magnet 1 and the iron core 2 increases. The problem is not resolved. Furthermore, in the signal generator shown in Fig. 5, the iron core 2 has an asymmetrical shape and the center of the salient pole portion 2A is shifted from the center of the magnet 1, so the overall shape of the signal generator becomes asymmetrical and the signal generator becomes large. There was a problem of giving shape.

[Means for solving the problems] The present invention is illustrated in FIGS. 1 and 2 showing one embodiment thereof.
As seen in the figure, a permanent magnet 1, a salient pole portion 20A facing the inductor rotor R, and a magnet whose surface opposite to the salient pole portion 20A is in contact with one magnetic pole surface of the permanent magnet 1. Iron core 2 integrally having contact portion 20B
0, a yoke member 3 which integrally has a base plate part 3B fixed to the mounting location and an upright wall part 3A that stands up from the base base part and overlaps with the other magnetic pole surface of the permanent magnet 1.
This is an improved signal generator including a signal generator coil 4 wound around the salient pole portion 20A of the iron core 20.

In the present invention, the iron core 20 includes a first core forming member 21 having a band-shaped salient pole forming part 21a and a plate-like part 21b bent at a substantially right angle from the base end of the salient pole forming part 21a. , a second core forming member 22 having a salient pole forming part 22a which is also in the form of a band and a plate part 22b bent at a substantially right angle from the base end of the salient pole forming part 22a; The salient pole forming portions 21a and 21b of the second core forming members 21 and 22 are overlapped with each other.

And the first and second core forming members 21 and 2
The two overlapping salient pole forming portions 21a and 21b constitute the salient pole portion 20A, and the plate portions 21b and 22b constitute the magnet contact portion 20B.

[Operation of the invention] When the iron core 20 is constituted by the first and second iron core forming members 21 and 22 as described above, the iron core 20
The cross-sectional area of the salient pole portion 20A can be secured by using an iron plate having half the thickness of the conventional one. Therefore, the magnet 1 and the magnet contact part 2 of the iron core
The thickness L of the laminate with 0B can be reduced, and the axial dimension of the signal generator can be reduced. Furthermore, when the core is constituted by the first and second core forming members as described above, it is possible to align the center of the salient pole portion 20A of the core with the center of the magnet 1 without forming a void in the magnet contact portion. Therefore, it is possible to increase the area of the magnet contact portion and improve the magnetic flux focusing ability without making the entire structure asymmetrical.

[Examples] Examples of the present invention will be described below with reference to the accompanying drawings.

1 and 2 show an embodiment of the present invention. In these figures, 1 is a permanent magnet formed into a rectangular plate shape and magnetized in the thickness direction, 20 is a salient pole portion 20A, and It is an iron core having a magnet contact part 20B that is in contact with one magnetic pole surface of the magnet 1, and the iron core 2
0 consists of first and second core forming members 21 and 22 having symmetrical shapes. The first core forming member 21 consists of a band-shaped salient pole forming portion 21a and a plate portion 21b bent at a substantially right angle from the base end of the salient pole forming portion 21a. Salient pole forming portion 22a and salient pole forming portion 2 which are also band-shaped
A plate-shaped portion 22 bent at a substantially right angle from the base end of 2a.
It consists of b. The first and second core forming members 21 and 22 are arranged with the salient pole forming parts 21a and 21b overlapping each other, and the salient pole forming parts 2
1a and 22a constitute a salient pole portion 20A, and plate portions 21b and 22b constitute a magnet contact portion 20B.

Reference numeral 3 designates a yoke member, which includes a magnet abutting portion 3A that is in contact with the other magnetic pole surface of the magnet 1, and a substrate portion that is bent at a substantially right angle from the base end of the magnet abutting portion 3A toward the salient pole portion 20A. 3B, and mounting holes 3C, 3C are provided at both ends of the substrate portion 3 for inserting screws used for mounting the signal generator to the mounting location.

Reference numeral 5 denotes a frame made of an insulating material, and this frame 5 includes the magnet 1, the magnet contact portion 20B of the iron core 20, and the yoke member 3.
It integrally includes a laminate locking part 5A formed to fit the laminate with the magnet contact part 3A and embrace the laminate, and a winding frame 5B fitted to the salient pole part 20A. However, the signal generator coil 4 is wound around the winding frame 5B.

Reference numeral 6 denotes an insulating case that is attached to cover the signal generating coil 4 together with the iron core 20, the magnet 1, and the magnet contact portion 3A of the yoke member 3, and the magnetic pole surface at the tip of the salient pole portion 20A is attached to the end surface of this case. 20A1 is exposed.

To assemble the above signal generator, first, the signal generator coil is wound around the winding frame 5B of the frame 5, and then the first and second core forming members 21 are passed through the space inside the locking part 5A of the frame 5. and 22 salient pole forming portions 21
a and 22a are inserted into the holes inside the winding frame 5B.
Next, the plate-shaped parts 21b and 22b of the core-forming members 21 and 22 are brought into contact with the bottom of the locking part 5A, and the permanent magnet 1 inserted inside the locking part 5A is inserted into the plate-shaped parts of the core-forming members 21 and 22. 21b and 22b. The magnet abutting part 3A of the successor iron member 3 is inserted inside the locking part 5A, and the magnet abutting part 3A is connected to the magnet 1.
The iron core 2 is placed inside the locking part 5A.
The laminated body of the magnet contact portion 20B of the magnet 1 and the magnet contact portion 3A of the yoke member 3 is locked. Next, an insulating resin is injected into the case 6 and hardened, and a part of the case 5 is cut off to expose the tip of the salient pole portion 20A of the iron core 20.

As shown in FIG. 1, the above signal generator S is installed at a fixed position near the rotor R having an inductor magnetic pole part Ra, and has a magnetic pole face 2 at the tip of the salient pole part 20A.
0A1 and side surface 3B1 of base plate portion 3B of yoke member 3
is opposed to the inductor magnetic pole portion Ra through a predetermined gap.

In the above embodiment, the first and second core forming members 21 and 22 have respective salient pole forming portions 21a.
It is preferable that the cutting directions of the cut surfaces at the tips of and 22a be oriented in the same direction with respect to the respective plate-like portions 21b and 22b. When formed in this way, the magnetic pole surface 20A1 at the tip of the salient pole portion 20A
As shown in FIG. 3, the core forming members 21 and 2
It becomes a symmetrical shape on both sides of the superposition surface of 2. Furthermore, the third
In the figure, 21a1 and 22a1 are sheared surfaces formed when punching the materials of the core forming members 21 and 22, and 21a2 and 22a2 are fractured surfaces.

In the conventional signal generator, as shown in FIG. 6, a sheared surface 2a1 and a fractured surface 2a2 generated during punching of the material are formed on the tip surface of the salient pole portion 2A of the iron core, and the salient pole portion Since the tip of 2A has an asymmetric shape, when this signal generator is used, the signal waveform will differ depending on the rotation direction of the rotor. Therefore, if it is necessary to obtain a signal with the same waveform no matter which direction the rotor rotates, the tip of the salient pole part 2A should be cut flat as shown by the chain line in Figure 6. Alternatively, it is necessary to take measures such as punching out the material of the iron core by high-precision press processing, and in either case, an increase in cost is unavoidable.

On the other hand, as in the present invention, the iron core 20 is
and the second core forming members 21 and 22, the cutting direction of the cut surfaces of the tips of the salient pole forming parts 21a and 22a is set to the respective plate parts 21b and 2.
By orienting the salient pole part 20A in the same direction as the salient pole part 20A, the tip surface of the salient pole part 20A can be made into a symmetrical shape. However, the signal waveforms can be made equal.

In the above embodiment, the side surface 3B1 of the base plate portion 3B of the yoke member 3 was made to face the rotor to magnetically couple the yoke member 3 to the rotor, but the magnetic path configuration of the signal generator In some cases, the rotor and the yoke member 3 may be magnetically coupled by arranging the attachment portion (made of a magnetic material) for attaching the yoke member 3 and the rotor to face each other through a narrow gap.
Further, the signal voltage may be induced by leakage magnetic flux from the magnet 1 without particularly actively magnetically coupling the yoke member 3 to the rotor.

[Effects of the invention] As described above, according to the invention, since the iron core is composed of the first and second core forming members, it is possible to use iron plates having half the thickness of the conventional one as the iron plate forming the iron core. Thus, the cross-sectional area of the salient pole portion can be secured. Therefore, the thickness L of the laminate of the magnet and the magnet abutting portion of the iron core can be reduced, and the axial dimension of the signal generator can be reduced. In addition, since the iron core is composed of the first and second core forming members, the center of the salient pole part of the iron core can be aligned with the center of the magnet without forming a void in the magnet contact part, making the whole asymmetrical. There is an advantage that the area of the magnet contact portion can be increased without making the shape into a specific shape, and the ability to focus the magnetic flux can be improved.

[Brief explanation of the drawing]

FIG. 1 is a schematic configuration diagram showing an embodiment of the present invention;
FIG. 2 is a perspective view of essential parts showing the iron core, magnet, and yoke member in the same embodiment, FIG. 3 is a partially enlarged side view showing the shape of the tip of the salient pole part in the same embodiment, and FIG.
5 and 5 are perspective views of essential parts showing the iron core, magnet, and yoke member in different conventional examples, respectively, and FIG. 6 is a partially enlarged side view showing the shape of the tip of the salient pole part of the iron core in the conventional signal generator. It is. DESCRIPTION OF SYMBOLS 1... Permanent magnet, 20... Iron core, 20A... Salient pole part, 20B... Magnet contact part, 21... First iron core forming member, 21a... Salient pole forming part, 21b...
Plate-shaped portion, 22... Second core forming member, 22a...
... salient pole forming part, 22b... plate-shaped part, 3... yoke member, 3A... magnet contact part, 3B... substrate part, 4...
...Signal generator coil, 6...Case.

Claims (1)

[Claims for Utility Model Registration] (1) A permanent magnet 1, a salient pole portion 20A facing the inductor rotor R, and a surface of one magnetic pole surface of the permanent magnet 1 opposite to the salient pole portion 20A. An iron core 20 that integrally has a magnet contact portion 20B that is in contact with the magnet contact portion 20B.
, a yoke member 3 which integrally includes a substrate portion 3B fixed to an attachment location and an upright wall portion 3A that stands up from the substrate portion and overlaps the other magnetic pole surface of the permanent magnet 1; and the iron core 20. In the signal generator including the signal generating coil 4 wound around the salient pole portion 20A, the iron core 20 includes a band-shaped salient pole forming portion 21a,
22a and plate-shaped portions 21b, 22b bent at a substantially right angle from the base end portions of the salient pole forming portions 21a, 22a.
first and second core forming members 21,
salient pole forming portions 21a, 22a of the first and second core forming members 21, 22;
are superposed on each other, and the first and second core forming members 21, 22
The salient pole forming parts 21a and 22a constitute the salient pole part 20A, and the plate-like part 21
A signal generator characterized in that the magnet contact portion 20B is constituted by b and 22b. (2) The first and second core forming members 21 and 22
Utility model registration claim No. 1, characterized in that the cut surfaces of the tips of the salient pole forming portions 21a, 22a are formed so that the cutting direction thereof faces in the same direction with respect to the respective plate-like portions 21b, 22b. The signal generator according to item 1.