JP5816914B2 - Annular stator structure for resolver - Google Patents

Description

  The present invention relates to a ring-shaped stator structure for a resolver, and in particular, a collar of an attachment portion is formed by a resin molding portion formed on a ring-shaped iron core, and a rib and an exposed outer peripheral portion are formed to improve noise resistance and thermal shock resistance. It relates to new improvements to obtain improvements.

Conventionally used examples of the ring-shaped stator structure for a resolver include, for example, the structures described in Patent Documents 1 and 2, but the structure actually manufactured as a product is shown in FIGS. The configuration disclosed in FIG.
That is, in the case of the conventional configuration 1 shown in FIG. 3, a ring-shaped iron core 1 that protrudes inward and has a plurality of protruding tooth portions 2 formed at predetermined angular intervals is used. On the outer peripheral surface 1a, a plurality of mounting portions 3 that are integral with the ring-shaped iron core 1 and project in the radial direction and have mounting holes 3a are formed at predetermined angular intervals.

  The first and second end faces 1b and 1c of the ring-shaped iron core 1 are formed as an integral or two-piece insulating cover portion 4 as shown by a one-dot chain line on the first end face 1b of FIG. 1b and the second end face 1c.

Further, in the conventional configuration 2 shown in FIG. 4, a plurality of projecting tooth portions 2 projecting inwardly are formed on the inner surface 1d of the ring-shaped iron core 1 so as to project in the radial direction at predetermined angular intervals. A plurality of attachment portions 3 protruding outward along the radial direction are formed on the outer peripheral surface 1 a of the core 1, and a cylindrical collar 3 </ b> A is formed on each attachment portion 3.
The collar 3A is formed with a mounting hole 3a which is a bolt hole for mounting the annular iron core 1 to a motor or the like.

Unlike the configuration in which the insulating cover portion 4 is formed integrally or with a body as shown in FIG. 3, the annular iron core 1 shown in FIG. 1) and is positioned by a large number of pins in the mold, and the entire ring-shaped iron core 1 is injection-molded integrally to form a resin molded portion 6.
The resin molded portion 6 is formed so as to include an outer peripheral surface 1a of the ring-shaped iron core 1, an attachment portion 3, and each protruding tooth portion 2. From the resin molded portion 6, the outer peripheral surface 1a and the attachment of the ring-shaped iron core 1 are attached. The state which covers so that the part 3 may not be exposed outside is comprised.

US Pat. No. 6,838,804 US Pat. No. 6,028,383

Since the conventional ring-shaped stator structure for a resolver is configured as described above, the following problems exist.
That is, as shown in FIG. 3, when the outer peripheral surface 1a of the ring-shaped iron core 1 is mounted on a motor or the like using a bolt hole-shaped mounting hole 3a, the mounting hole 3a functions as a noise antenna. Due to the noise input through 3a, the S / N ratio of the output signal of the resolver is deteriorated, and the rotational position detection accuracy is deteriorated.

Moreover, since the outer peripheral surface 1a of the ring-shaped iron core 1 shown in FIG. 4 is completely covered with the resin molded portion 6, for example, due to the difference in thermal shrinkage between the ring-shaped iron core 1 and the resin molded portion 6 during a thermal shock. The generated stress could not be relieved, and a crack occurred in the resin molded portion 6, causing a failure or the like.
Moreover, since the outer peripheral surface 1a of the ring-shaped iron core 1 is completely covered with the resin molding part 6, the ring-shaped iron core 1 before molding can be positioned as it is at a predetermined position in the mold of the injection molding machine. First, in order to perform this mounting, a large number of pins must be provided along the circumferential direction in the mold, and the resin-molded portion 6 is formed by injection molding after pressing and fixing the annular iron core with each pin. Therefore, the structure of the mold was complicated.
In addition, after the molding, the pin hole 5 formed when the pin is pulled out remains in the resin molding portion 6 of the annular core 1.
The pin hole 5 remaining in the resin molded part 6 is a factor for causing stress to concentrate on the pin hole 5 and causing cracks in the resin molded part 6 when the annular core 1 is used as a resolver thereafter. It was.

The ring-shaped stator structure for a resolver according to the present invention has a ring-shaped iron core that protrudes inward and has a plurality of protruding tooth portions formed at predetermined angular intervals, and is formed to protrude from the outer peripheral surface of the ring-shaped iron core. A plurality of attachment portions having holes, and a first molded end surface, a second end surface, an outer peripheral surface of each of the ring-shaped iron cores, the respective protruding tooth portions, the mounted molded portions, and a resin molded portion integrally formed by injection molding in the mounted holes. A cylindrical collar is formed by the resin molded portion formed in the mounting hole, and at least a part of the outer peripheral surface of the annular iron core has an exposed outer peripheral portion exposed to the outside from the resin molded portion. is formed, wherein the said resin molded portion in which the first covering the end face and second end face, in a configuration in which the rib projecting along the axial direction of the annular iron core is formed over the entire circumference of the annular iron core, before The exposed outer peripheral part is the mounting part. Is formed on the rib outer peripheral surface the a peripheral surface of the ribs, the annular iron core in a plan view, the first of the annular iron core in a shape a repetition of the irregularities from the outer and outwardly from the inside with inward-facing The arc-shaped recess formed in the second end surface and formed in the resin molding portion corresponds to each of the mounting portions, and the exposed outer peripheral portion places the resin molding portion of the annular iron core in the mold of the injection molding machine. It is the structure used for positioning in the said metal mold | die when shape | molding by .

Since the ring-shaped stator structure for a resolver according to the present invention is configured as described above, the following effects can be obtained.
That is, a ring-shaped iron core having a plurality of projecting tooth portions projecting inward and formed at predetermined angular intervals, and a plurality of mounting portions having projecting holes formed on the outer peripheral surface of the ring-shaped iron core, The first end surface, the second end surface, the outer peripheral surface of the ring-shaped iron core, the protruding tooth portions, the mounting portion, and a resin molding portion integrally formed by injection molding on the mounting hole. A cylindrical collar is formed by the formed resin molded portion, and an exposed outer peripheral portion exposed to the outside from the resin molded portion is formed on at least a part of the outer peripheral surface of the annular iron core, and the first end surface and The resin molded portion covering the second end surface is formed with ribs protruding along the axial direction of the ring-shaped iron core, so that there is no noise antenna, and it is affected by noise from an external motor or the like. Hard and resistant to thermal shock Production of the resolver is possible.
Further, since the exposed outer peripheral portion is formed between the mounting portions, positioning of the ring-shaped iron core in the mold becomes easier than a configuration using a conventional pin.
In addition, since the rib is continuously formed over the entire circumference of the ring-shaped iron core, the strength of the resin molded portion can be increased, and a resolver resistant to thermal shock can be obtained.

It is a top view which shows the ring-shaped stator structure for resolvers by this invention. It is an AA expanded sectional view of FIG. It is a top view which shows the conventional structure 1 of the conventional ring-shaped stator structure for resolvers. It is a top view which shows the conventional structure 2 of the conventional ring-shaped stator structure for resolvers.

  The present invention is a resolver in which the collar of the mounting portion is integrally formed by the resin molding portion formed on the ring-shaped iron core, and the rib and the exposed outer peripheral portion are formed to improve noise resistance and thermal shock resistance. An object is to provide a ring-shaped stator structure.

A preferred embodiment of a ring-shaped stator structure for a resolver according to the present invention will be described below with reference to the drawings.
In addition, the same code | symbol is attached | subjected and demonstrated to a part the same as that of a prior art example, or an equivalent part.
In FIG. 1, what is indicated by reference numeral 1 is a ring-shaped iron core made of a laminated type or the like, and an inner surface 1d of the ring-shaped iron core 1 protrudes inward and is formed at predetermined angular intervals. The protruding tooth portion 2 is formed.

On the outer peripheral surface 1 a of the ring-shaped iron core 1, a plurality of attachment portions 3 that protrudes outward along the radial direction are formed integrally with the ring-shaped iron core 1.
The first end surface 1b, the second end surface 1c, the outer peripheral surface 1a, the protruding tooth portions 2, the mounting portions 3 and the mounting holes 3a of the ring-shaped iron core 1 are integrally formed by injection molding using an injection molding machine (not shown). A resin molded portion 6 is formed.

The above-described ring-shaped iron core 1 shown in FIG. 1 shows a state in which a resin molded portion 6 is injection-molded in a mold of an injection molding machine, and a part of the outer peripheral surface 1a of the ring-shaped iron core 1 is The exposed outer peripheral portion 10 is exposed and formed on a part of the outer periphery of the ring-shaped iron core 1 because it is exposed outward from the concave portion 6 </ b> A formed on the outer periphery of the resin molded portion 6. In addition, the arc-shaped recessed part 6B formed in the said resin molding part 6 is formed corresponding to each said attachment part 3. As shown in FIG.

  Moreover, the said resin molding part 6 protrudes outside along the axial direction B from the said 1st end surface 1b and the 2nd end surface 1c, as FIG. 2 which is AA expanded sectional drawing of FIG. As shown in FIG. 1, the rib outer surface 11a, which is the outer peripheral surface of the rib 11, is formed from the inner side to the outer side and the opposite direction. It is comprised by the shape which becomes an uneven | corrugated repetition.

  As shown in FIG. 1, for example, seven exposed outer peripheral portions 10 formed on a part of the outer peripheral surface 1 a of the ring-shaped iron core 1 are formed and positioned between the mounting portions 3. When positioning the ring-shaped iron core 1 in the mold of an injection molding machine, by pressing the exposed outer peripheral portions 10 from the end faces 1b and 1c with a jig in the mold, The annular iron core 1 can be positioned and held in the mold without using the pins that have been used.

With the ribs 11 formed in the resin molded portion 6 and having a ring shape, it is possible to manufacture a resolver that is resistant to thermal shock without the possibility of a stress-concentrated crack due to a conventional pin hole or the like.
In addition, the collar 3A formed in the mounting hole 3a in each mounting portion 3 has a rod in each mounting hole 3a when the ring-shaped iron core 1 is installed in a mold and the resin molding portion 6 is molded. By inserting (not shown), a collar 3A made of a ring-shaped resin is formed in a portion excluding the rod, and the mounting hole 3a is covered with the collar 3A without exposing the magnetic part. Therefore, it is possible to obtain a resolver that is hardly affected by noise from a motor or the like.
Since the collar 3A is a cylindrical body, the through-hole 3aA inside the collar 3A functions as a mounting hole for passing a bolt when connecting the resolver to a motor or the like.

  The ring-shaped stator structure for a resolver according to the present invention forms the collar of the mounting portion by the resin molded portion formed on the ring-shaped iron core, and forms the rib and the exposed outer peripheral portion to obtain the improvement in noise resistance and thermal shock resistance. Can do.

DESCRIPTION OF SYMBOLS 1 Ring-shaped iron core 1a Outer peripheral surface 1b 1st end surface 1c 2nd end surface 1d Inner surface 2 Projection tooth part 3 Attachment part 3a Attachment hole 3A Color 3aA Through-hole 6 Resin molding part
6A recess
6B Arc-shaped recessed part 10 Exposed outer peripheral part 11 Rib 11a Rib outer peripheral surface B Axial direction

Claims (1)

A ring-shaped iron core (1) having a plurality of protruding tooth portions (2) formed inwardly and projecting at predetermined angular intervals, and formed to protrude from the outer peripheral surface (1a) of the ring-shaped iron core (1) A plurality of mounting portions (3) having mounting holes (3a), a first end surface (1b), a second end surface (1c), an outer peripheral surface (1a) of the ring-shaped iron core (1), and the protruding tooth portions. (2), the mounting portion (3) and the resin molding portion (6) integrally formed by injection molding in the mounting hole (3a),
A cylindrical collar (3A) is formed by the resin molding part (6) formed in the mounting hole (3a), and the resin is provided on at least a part of the outer peripheral surface (1a) of the annular iron core (1). An exposed outer peripheral portion (10) exposed to the outside from the molding portion (6) is formed, and the ring-shaped iron core is formed on the resin molding portion (6) covering the first end surface (1b) and the second end surface (1c). in resolver annular stator structure ribs projecting in the axial direction (B) (11) is characterized in that it is formed over the entire circumference of the annular iron core (1) (1), the exposed outer peripheral portion (10) is formed between the mounting portions (3), and the rib outer peripheral surface (11a) which is the outer peripheral surface of the rib (11) is an outer side from the inside when the ring-shaped iron core (1) is viewed in a plane. And an arc-shaped recess formed on the first and second end faces (1b, 1c) of the ring-shaped iron core (1) in a shape that is repeatedly concave and convex from the outside to the inside, and formed on the resin molded part (6) (6B) corresponds to each mounting part (3) above The exposed outer peripheral portion (10) is used for positioning in the mold when the resin molded portion (6) of the annular iron core (1) is molded in a mold of an injection molding machine. A resolver ring-shaped stator structure characterized by comprising .

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