JP2023071260A - Resolver stator structure having slit - Google Patents

Abstract

To prevent deterioration of permeability when mounting an annular stator core onto a mating member.SOLUTION: A resolver stator structure having slits comprises: an annularly-formed annular stator core (1) having a number of protruded magnetic poles (3) that protrude inward for each predetermined angle interval; stator windings (4) wound around the respective protruded magnetic poles (3); fastening holes (6) formed on an outer edge (1b) of the annular stator core (1) and outside positions corresponding to the respective protruded magnet poles (3); assembling parts (7) screwed or inserted into the respective fastening holes (6); and slits (12) formed between the respective fastening holes (6) and the respective protruded magnetic poles (3) of the annular stator core (1). A slit width (B) of each of the slits (12) is at least 1.4 to 2.0 times a diameter (A) of a seating face where a head portion (7A) of the assembling part (7) is located.SELECTED DRAWING: Figure 1

Description

TECHNICAL FIELD The present invention relates to a resolver stator structure having slits, and in particular, the slits are designed to prevent the magnetic pole side from being affected by the deterioration of magnetic permeability in the internal stress generating region that occurs when a ring-shaped stator core is fastened to a mating member by an assembly part. It relates to a new improvement to prevent by.

Conventional resolver stator structures having slits of this type include, for example, structures disclosed in Patent Documents 1 and 2.
That is, in the resolver of Patent Document 1, although not shown, a plurality of gaps are formed in the annular stator main body. Then, when a straight line is drawn from the center point of the stator body toward the outside in the radial direction of the stator body, and the straight line is rotated 360 degrees with respect to the center point, the straight line is at least one of the inner gap and the outer gap. is designed to intersect with Therefore, magnetic flux (noise caused by magnetism) entering from the outer peripheral surface side of the stator main body always passes through the radially outer side of each air gap, and most of it is blocked by each air gap. .
In the resolver of Patent Document 2, although not shown, the stator structure includes an annular stator main body, and a stator body extending from the inner peripheral side or the outer peripheral side of the stator main body and extending along the circumferential direction of the stator main body. a stator core having a plurality of tooth portions arranged in parallel with each other; The stator main body includes a plurality of first elongated holes formed in an arc shape along the circumferential direction of the stator main body, and provided corresponding to each of the plurality of first elongated holes. and a plurality of second elongated holes formed in an arc shape. Each second elongated hole is arranged between the corresponding first elongated hole and the tooth portion to face the corresponding first elongated hole with a gap therebetween. The opening angle of the second long hole with respect to the radial center of the stator main body is equal to or greater than the opening angle of the first long hole with respect to the radial center of the stator main body, and the slit prevents adverse effects from external magnetic flux. Configuration.

Further, although not disclosed as a patent document, other conventional configurations manufactured in-house by the applicant of the present invention include configurations shown in FIGS. 9 to 11. FIG.
That is, the configuration shown in FIG. 9 is a disk-shaped ring-shaped stator core 1. On the inner surface 1a of the ring-shaped stator core 1, a large number of protruding magnetic poles 3 protruding inward are formed at predetermined angular intervals. A stator winding 4 is wound around each protruding magnetic pole 3 .

A single fastening hole 6 corresponding to each protruding magnetic pole 3 is formed in the outer edge 1b of the annular stator core 1 having each of the protruding magnetic poles 3. Pins, screws, and rivets are provided in this fastening hole 6. The annular stator core 1 is press-fixed to the mating member 8 such as an automobile or a machine tool by screwing or press-fitting an assembly part 7 made up of, for example, a mating member 8 .
In the above case, in the case of the mounting part 7 consisting of a screw, the head of this mounting part 7 presses/sliding against the surface 1c (shown in FIG. 1) of the annular stator core 1, thereby creating the stress generating region 10. , and the bearing surface diameter A is determined by the head.

Since stress acts on the circumference of the fastening hole 6, a stress generation region 10 is formed outside the bearing surface diameter A. As shown in FIG.
In FIG. 9, the slit 12 shown in FIGS. 10 and 11 is not formed between the projecting magnetic pole 3 and the fastening hole 6, but in any case, the stress generating region 10 is formed in the magnetic path. As a result, the magnetic permeability around the projecting magnetic poles 3 and their fastening holes 6 deteriorates, and the flow of magnetic flux is adversely affected. accuracy was greatly degraded.

10 and 11 are different from the configuration of FIG. 9 described above, in that the slit width B and the bearing surface diameter A of the slit 12 are substantially the same, so that the stress generation region 10 generated around the fastening hole 6 It has been difficult to prevent the spread of .

JP-A-2006-64409 JP 2018-133989 A

Since the conventional resolver shown in FIGS. 10 and 11 is configured as described above, it has the following problems.
In other words, in the conventional configuration described above, in any case, the slit width B of the slit formed in the annular stator core is equal to the fastening hole diameter C of the fastening hole 6 in FIG. The main configuration was to prevent external magnetic flux coming from the outside from adversely affecting the stator windings of the protruding magnetic poles through the ring-shaped stator core and from superimposing an erroneous signal on the resolver detection signal.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems. In particular, when an annular stator core is fastened to a mating member by an assembly part, the internal stress generated from the periphery of the assembly part causes the protruding magnetic poles to become deformed. To obtain a resolver stator structure having a slit that prevents the deterioration of the peripheral magnetic permeability and the deterioration of the precision of a resolver detection signal by means of the slit.

A resolver stator structure having slits according to the present invention comprises a ring-shaped stator core having a ring-like overall shape and having a number of protruding magnetic poles protruding inwardly at predetermined angular intervals, and a coil wound around each protruding magnetic pole. a stator winding, a fastening hole formed at an outer position corresponding to the protruding magnetic pole on the outer edge of the annular stator core, an assembly part to be screwed or inserted into the fastening hole, and the fastening hole of the annular stator core. a slit formed between the projecting magnetic pole and the slit, wherein the slit width of the slit is at least 1.4 times the diameter of the bearing surface on which the head of the assembly part is located; The slit width of the slit is 1.4 to 2.0 times the bearing surface diameter of the fastening hole, and the fastening hole is formed in the vicinity of only the slit of the annular stator core. In addition, the ring-shaped stator core is fixed to the mating member by screwing or fitting through the attachment part screwed or inserted into the fastening hole.

Since the resolver stator structure having slits according to the present invention is configured as described above, the following effects can be obtained.
That is, a ring-shaped stator core having a ring-shaped overall shape and having a large number of protruding magnetic poles protruding inward at predetermined angular intervals, a stator winding wound around each of the protruding magnetic poles, and the ring-shaped stator core. fastening holes formed at outer positions corresponding to the protruding magnetic poles on the outer edge; assembly parts to be screwed or inserted into the fastening holes; The slit width of the slit is at least 1.4 times the diameter of the bearing surface on which the head of the assembly part is located, so that the stress area generated by mounting the annular stator core to the mating member , the transmission is prevented by the slits, the magnetic permeability of the protruding magnetic poles is almost unchanged, and the resolver output from the stator windings of the annular stator core can obtain stress-free signals.
Moreover, since the slit width of the slit is 1.4 to 2.0 times the bearing surface diameter of the fastening hole, it can be applied to resolvers ranging from ultra-compact resolvers to large resolvers.
Further, since the fastening hole is formed in the vicinity of only the slit of the annular stator core, it is possible to efficiently prevent a change in magnetic permeability due to stress generated by the assembly parts fastened to the fastening hole. can.
Further, by fixing the ring-shaped stator core to the mating member by screwing or fitting through the assembly part screwed or inserted into the fastening hole, the ring-shaped stator core can be easily attached to the mating member by the assembly part. becomes possible.

1 is a plan view of a resolver stator structure according to an embodiment of the invention; FIG. 2 is an enlarged cross-sectional view of a main part of FIG. 1; FIG. 2 is an enlarged plan view of a main part of FIG. 1; FIG. FIG. 3 is a plan view of a main part showing a slit with a diameter of 1.4 times the bearing surface diameter of FIG. 2 ; FIG. 5 is a plan view showing the stress generation region of FIG. 4; FIG. 6 is a plan view showing that stress isolation is possible in a slit having a diameter of 1.4 times the bearing surface diameter of FIG. 5 ; FIG. 5 is a plan view showing a slit having a diameter twice as large as that of the bearing surface shown in FIG. 4; FIG. 8 is a plan view showing a state in which stress generating regions are formed in FIG. 7; FIG. 4 is a plan view showing a part of a conventional resolver stator structure in which slits are not formed; FIG. 10 is a plan view of a resolver stator structure showing a state of a conventional stress generation region and slits; FIG. 10 is a plan view showing a conventional slit width bearing surface diameter, a slit, and a stress generation region;

In a preferred embodiment of the resolver stator structure having slits according to the present invention, especially when the ring-shaped stator core is fastened to the mating member by the assembly parts, the influence of the deterioration of the magnetic permeability of the stress generating region generated around it is reduced. A slit having a slit diameter of at least 1.4 times the diameter of the bearing surface is used to prevent the protruding magnetic pole from being caught.

Preferred embodiments of the resolver stator structure having slits according to the present invention will be described below with reference to the drawings.
Identical or equivalent portions to those of the conventional example are denoted by the same reference numerals.
Reference numeral 1 in FIG. 1 denotes a disk-shaped ring-shaped stator core. On the inner surface 1a of the ring-shaped stator core 1, a large number of protruding magnetic poles 3 protruding inward are formed at predetermined angular intervals. there is A stator winding 4 is wound around each protruding magnetic pole 3 .

The outer edge 1b of the annular stator core located outside the protruding magnetic poles 3 is attached to a mating member 8 made of an automobile, a machine tool, or the like. It is attached via an attachment part 7.
In the above-described case, the annular stator core 1 is rotated by screwing or inserting the mounting part 7 into the mating member 8 through the fastening hole 6 provided in the outer edge 1b of the annular stator core 1 and rotating it. It is firmly pressed and fixed to the counterpart member 8 .
The fastening holes 6 are formed only in the vicinity of the slits 12 of the annular stator core 1 .

In this case, a slit 12 having a slit width B is formed between the projecting magnetic pole 3 and the fastening hole 6 . That is, the slit 12 is formed radially inward of the annular stator core 1 from the fastening hole 6 . When the head portion 7A of the mounting part 7 is pressed against the surface 1c, the surface 1c of the ring-shaped stator core 1 has a stress generation region 10 indicated by a dotted line in FIG. A region is formed.

Between the fastening hole 6 and the protruding magnetic pole 3, that is, between the mounting part 7 and the protruding magnetic pole 3, a slit width of at least 1.4 times the length of the bearing surface diameter A of the bearing surface 20 is provided. A slit 12 composed of B is formed. The fastening holes 6 and the slits 12 are not formed corresponding to all the protruding magnetic poles 3, but are formed inside the protruding magnetic poles 3 for every single jump. Also, if the slits 12 are formed inside all the projecting magnetic poles 3, the annular stator core 1 does not have the mechanical strength.
Although there is a possibility that the stress generating region 10 generated around the mounting part 7 is formed on the side of the protruding magnetic pole 3 due to the mounting by the mounting part 7, the slit 12 prevents the stress on the side of the protruding magnetic pole 3 from occurring. It is possible to prevent the formation of the generating region 10, maintain the magnetic permeability of the protruding magnetic poles 3 in a normal state, and rotate the rotor (not shown) through the stator windings 4 wound around the protruding magnetic poles 3. can obtain the resolver output signal by

When the screw shown in FIG. 2 is used as the mounting part 7, the screw is integrally provided with a threaded portion 7a and a head portion 7A having a diameter larger than that of the threaded portion 7a. The bearing surface 20 is pressed toward the counterpart member 8 and rotated, so that the stress generating region 10 is formed on the surface 1c of the annular stator core 1 as indicated by the dotted line.
Further, each slit 12 is formed corresponding to the protruding magnetic poles 3 that are separated from each other among the protruding magnetic poles 3 .

FIG. 3 is an enlarged plan view showing another configuration of the essential part of FIG. Considering the thickness of the annular stator core 1 and the distance between the projecting magnetic poles 3 and the fastening holes 6, it can be said to be a limit value.
Incidentally, the numerical value of the slit width B being 1.4 times the bearing surface diameter A is the minimum value that appears as an effect.

4, 5, and 6 are plan views of the essential parts of the ring-shaped stator core 1 when the aforementioned limit value of the slit width B is 1.4 times the bearing surface diameter A. FIG.

7 and 8 show a state in which the aforementioned slit width B is 2.0 times the bearing surface diameter A. FIG. When the ring-shaped stator core 1 is thin and the radially protruding magnetic poles 3, the slits 12 and the fastening holes 6 are located close to each other, the above-mentioned 2.0 times is the structural maximum limit. , 1.4 times is the minimum limit. That is, since the thickness of each stator piece in the present invention is extremely thin, the limit for press molding is 2.0 times.
Moreover, the magnetic flux E shown in FIGS. 1, 3, and 6 indicates that the normal resolver output is obtained without the adverse effect of the stress generating region 10 on the protruding magnetic pole 3 side due to the slit 12. .

In the resolver stator structure having slits according to the present invention, the slits prevent the magnetic pole side from being affected by deterioration of the magnetic permeability of the stress generating region that occurs when the ring-shaped stator core is fastened to the mating member by the assembly parts. By setting the slit width to 1.4 to 2.0 times the bearing surface diameter, the expansion of the stress generating region toward the protruding magnetic pole side is prevented and the detection accuracy of the resolver is maintained.

1 Ring-shaped stator core 1a Inner surface 1b Outer edge 1c Surface 3 Protruding magnetic pole 4 Stator winding 6 Fastening hole 7 Mounting part 7A Head 7a Threaded portion 8 Opposite member 10 Stress generation area 12 Slit 20 Seat surface A Seat surface diameter B Slit width C Fastening Hole diameter E magnetic flux

Claims (4)

A ring-shaped stator core (1) having a ring-shaped overall shape and having a large number of protruding magnetic poles (3) protruding inward at predetermined angular intervals, and a stator winding wound around each of the protruding magnetic poles (3). A wire (4), a fastening hole (6) formed at an outer edge (1b) of the annular stator core (1) at an outer position corresponding to the protruding magnetic pole (3), and a screw or An assembly part (7) to be inserted, and a slit (12) formed between the fastening hole (6) of the annular stator core (1) and the protruding magnetic pole (3),
A resolver stator characterized in that the slit width (B) of the slit (12) is at least 1.4 times the bearing surface diameter (A) on which the head (7A) of the assembly part (7) is located. structure. 2. The resolver according to claim 1, wherein the slit width (B) of the slit (12) is 1.4 to 2.0 times the bearing surface diameter (A) of the fastening hole (6). stator structure. 3. The resolver stator structure according to claim 1, wherein the fastening hole (6) is formed in the vicinity of only the slit (12) of the annular stator core (1). The ring-shaped stator core (1) is fixed to the mating member (8) by screwing or fitting through the assembly part (7) screwed or inserted into the fastening hole (6). 4. A resolver stator structure according to any one of items 1 to 3.

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