JPH04128082U - Coil bobbin for outer rotor type motor - Google Patents

Abstract

(57) [Summary] [Purpose] A coil bobbin that is mounted in the circumferential groove between the flanges of an inner yoke of an outer rotor type motor made of a magnetic material that integrally has multiple flanges on the outer periphery of the central cylinder. Regarding. A bobbin structure is provided that is effective in reducing the manufacturing cost (parts cost and assembly cost) of the entire motor. [Structure] The coil bobbin is an integrally molded plastic product, and the two semicircular bodies 20a and 20b are connected to the hinge part 20.
They are connected at c and form a ring shape as a whole. The semicircular bodies 20a and 20b have a U-shaped cross section and include a cylindrical portion 21 and two flanges 22.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This idea is based on an outer rotor in which a ring-shaped rotor is placed around the outer periphery of the stator. The present invention relates to a motor type motor, and particularly to a coil bobbin attached to a yoke of a stator.

0002

[Conventional technology]

A stepping motor with a permanent magnet type claw pole structure has magnetic pole teeth due to its sheet metal structure. It constitutes a magnetic circuit surrounding the column and the excitation coil. This is a common inner rotor Not limited to the type of motor, for example, the outer The same applies to rotor type motors.

0003 In a conventional general claw pole stator, the magnetic pole tooth row for one phase is made of two sheets of metal. By attaching a large number of claws to the plate and aligning the claws of two sheet metal parts correctly facing each other. It is composed of Then, a coil wound on a bobbin is sandwiched between the two sheet metal parts. I'm absorbed in it. In this structure, each stator part (sheet metal part) is assembled together. Due to positioning error, the air gap of the magnetic pole tooth row is not uniform, and therefore the motor There was a problem in that the static angle accuracy of the data varied greatly.

0004 As a means to solve this problem, for example, Japanese Patent Laid-Open No. 61-135356 discloses As shown, slits are formed in one sheet metal part in the form of dashed lines. A technique is known in which magnetic pole tooth rows for two phases are formed on one sheet metal part by this method. According to this technique, the position and shape accuracy of the magnetic pole tooth row is extremely improved.

[0005] Adopting technology to form a magnetic pole tooth row using broken line slits in one sheet metal part, The present inventors previously proposed an outer rotor-type stepping motor with the structure shown in FIGS. 1 and 2. Developed a motor. First, regarding the previously proposed outer rotor type stepping motor. , will be explained in detail based on FIGS. 1 and 2.

[0006] 5 is an inner yoke, which integrally has three flanges 5a on the outer periphery of the central cylindrical portion. It is a magnetic material. Two circumferential grooves are formed on the outer periphery of the inner yoke 5 by three flanges 5a. are formed, and a plastic half-split bobbin 7 shown in FIG. 3 is placed in each groove. is set, and the coil 8 is wound on it.

[0007] Reference numeral 6 denotes an outer yoke made of a ring-shaped magnetic material. A magnetic pole tooth row is formed by the slits 6a. The inner diameter of the outer yoke 6 is a flange. 5a, and as shown in the figure, there is a ring-shaped The outer yoke 6 is fitted in a tight fit.

[0008] 9 is a bearing fixed to the center hole of the inner yoke 5, and 3 is inserted through the bearing 9 and rotates. The rotor shaft is rotatably supported, and 15 is a retaining ring that stops the rotor shaft 3 from moving in the axial direction. , 1 is a cup-shaped case fixed to the upper end of the rotor shaft 3, 2 is a cup-shaped case This is a rotor magnet consisting of a ring-shaped permanent magnet fixed to the inner peripheral surface of the rotor magnet.

[0009] The inner diameter of the rotor magnet 2 is slightly larger than the outer diameter of the outer yoke 6. The magnetic pole face faces the magnetic pole tooth row of the outer yoke 6 with a slight gap therebetween. In addition The magnetization pattern of the rotor magnet 2 and the pattern of the magnetic pole tooth row on the stator side are usually Since it may be the same as the permanent magnet type stepping motor, it will not be described in detail here.

0010 Further, 10 is a base plate fixed to one end surface of the inner yoke 5 with a screw 11. A terminal portion 14 for external connection is integrally formed on a part of the outer periphery. Be The base plate 10 is made of a metal plate, and the terminal part 14, which is thinner than other parts, is After forming an insulating layer on the surface, a wiring pattern 13 is formed by printed wiring on it. Ru. Then, the coil 8 The terminal end 12 is pulled out and soldered to the wiring pattern of the terminal portion 14.

[0011] In Fig. 1, 16 is a flat washer and 17 is a spring washer, which connects the rotor and stator. This is to ensure smooth rotation of the rotor while eliminating looseness.

0012

[Problem that the idea aims to solve]

The previously proposed outer rotor stepping motor shown in Figures 1 and 2 has multiple Rather than meshing protrusions on yoke parts to form a magnetic pole tooth row, Since the magnetic pole tooth row is formed on the yoke 6, the accuracy of the pattern of the magnetic pole tooth row depends on each part. It no longer depends on the assembly accuracy of the cylindrical part, and the plurality of flanges 5a can be aligned around the outer periphery of the central cylindrical part. Since the stator is constructed by combining the inner yoke 5 provided on the body and the outer yoke 6, Its basic features include a simplified structure and easy assembly. But figure The structure shown has the following problems that should be improved.

[0013] As mentioned above, in the structure of FIGS. 1 and 2, between each flange 5a on the outer periphery of the inner yoke 5, Set the half-split bobbin 7 shown in Fig. 3 in the circumferential groove, and wind the coil 8 on it. ing. Here, set two half-split bobbins 7 in one groove and wind the coil 8. There was a problem in that the workability during attachment was very poor. In other words, the halved bobbin 7 and the inner Since the fitting force with the groove of the arc 5 is weak, the half bobbin 7 may fall off at the start of winding, or The halved bobbin 7 slipped and spun during the line, resulting in poor workability. Therefore, the half-split If you attach the bottle 7 to the inner yoke 5 with adhesive before winding the coil, the winding process will be easier. Although the workability is improved, the process of gluing the halved bobbin 7 to the inner yoke 5 is increased. Therefore, the overall workability does not improve much. Also, two coils can be installed in one coil mounting groove. Since the halved bobbin 7 is used, the number of parts is large and the cost is high.

[0014] Note that the above problem is not limited to the stepping motor with the structure shown in FIGS. 1 and 2. If the relationship between the stator yoke and coil bobbin is similar, other outer rotor type models This also occurs for data.

[0015] This idea was made in view of the conventional problems mentioned above, and its purpose was to An outer rotor type motor made of a magnetic material that has multiple flanges integrated around the outer periphery of the cylindrical part. The coil bobbin is installed in the circumferential groove between the flanges of the inner yoke of the motor. This reduces the manufacturing cost (parts cost and assembly cost) of the entire motor. The aim is to provide an effective bobbin structure.

[0016]

[Means to solve the problem]

The coil bobbin of the outer rotor type motor according to this invention is made of plastic. a substantially C-shape that is integrally molded with the inner yoke and fits into a substantially semicircular portion of the circumferential groove of the inner yoke. a substantially C-shaped semicircle that fits into the remaining semicircular portion of the circumferential groove; With the body and these two semicircular bodies combined in a ring shape, one end of both semicircular bodies is aligned. It is equipped with a hinge part that connects to the body.

[0017]

[Effect]

With the two semicircular bodies separated by the hinge part, insert the two semicircular bodies into the inner part. Fit into the circumferential groove of the yoke, and then use the elastic force of the hinge to assemble both semicircular bodies into a ring shape. Make it match. Now the two semicircular bodies fit snugly into the circumferential groove of the inner yoke. do.

[0018]

【Example】

FIG. 4 shows a first embodiment of this invention. This coil bobbin is plastic It is an integrally molded product, and the two semicircular bodies 20a and 20b are connected by a hinge part 20c. Therefore, it has a ring shape as a whole. The cross-sectional shape of the semicircular bodies 20a and 20b is It is U-shaped and has a cylindrical portion 21 and two flanges 22.

[0019] The two semicircular bodies 20a and 20b are symmetrical with respect to the diameter line, and have a hinge. The hinge part 20c and the opposite side are completely separated, and only the hinge part 20c has two semicircular Bodies 20a and 20b are connected. The hinge portion 20c of this embodiment is the flange 2 It is set at the outermost circumference of 2, and the inner circumference is separated by a slit 23. There is. The elastic force of the hinge part 20c moves the two semicircular bodies 20a and 20b as shown in the figure. It acts to combine into a ring shape.

[0020] Therefore, the two semicircular bodies 20a and 20b are connected on both sides with the hinge part 20c as the border. It can be transformed to expand. There are two semicircular bodies 20a and 20b. After expanding it to a certain extent, fit it into the circumferential groove between the flanges of the inner yoke 5 (see Fig. 1). can be included. And remove the force that spreads the two semicircular bodies 20a and 20b Then, the two semicircular bodies 20a and 20b are linked by the elastic force of the hinge part 20c. The inner yoke 5 is restored to its original shape and fits snugly into the central cylindrical portion of the inner yoke 5. Put a coil on top of this Roll.

[0021] FIG. 5 shows a second embodiment of this invention. This is the bobbin smell of the first example. Then, the tips of the two semicircular bodies 20a and 20b on the opposite side of the hinge part 20c are connected to each other, A fitting convex portion 24 is provided on one side so that it can be connected in a ring-shaped state. A fitting recess 25 is provided on the other side. Insert this bobbin into the inner yoke in the same way as above. 5, and the protrusion 24 is fitted into the recess 25. Then two semicircular bodies 20 The tips of a and 20b are also firmly connected, and the bobbin is firmly fixed to the yoke 5. It will be done.

[0022] FIG. 6 shows a third embodiment of this invention. This is the coaxial bobbin of the first embodiment. It is a single part in the form of two pieces connected at a predetermined distance above. In other words, two hints A bridge portion 26 is provided between the bridge portions 20c to integrate the two bobbins. Figure 1, For the two-phase motor shown in Fig. 2, only one bobbin is required for the double bobbin of this embodiment Can be assembled.

[0023] FIG. 7 shows a fourth embodiment of this invention. In this embodiment, the hinge portion 20c The formation positions of the two semicircular bodies 20a and 20b are different from those of the previous three embodiments, and the cylindrical portions of the two semicircular bodies 20a and 20b are 21 is provided with a hinge portion 20c. In this case, two semicircular bodies 20a and 20 so that the flange 22 on the outer circumferential side of the hinge portion 20c does not interfere when b is expanded. A V-shaped notch 27 is formed between the flanges 22.

[0024]

[Effect of the idea]

This idea consists of a magnetic material that has multiple flanges integrated around the outer periphery of the central cylindrical part. Mounted in the circumferential groove between the flanges of the inner yoke of an outer rotor type motor. One type of coil bobbin that is attached by connecting two half-split bobbins with a hinge. Since the number of parts constituting the motor is reduced. plastic Even if the parts (bobbins) that are integrally molded in If the number of bobbin parts used is reduced, costs can be reduced. Also, Compared to the conventional technology that uses two half-split bobbins for one circumferential groove of the yoke. This invention greatly simplifies the work of installing the bobbin and winding the coil.

[Brief explanation of drawings]

[Figure 1] Cross-sectional view of an outer rotor stepping motor that is the premise of the present invention, which was previously proposed by the present inventors.

[Figure 2] Partially cutaway perspective view of the stator assembly in the same motor.

[Figure 3] Perspective view of a conventional bobbin used in the above motor

[Fig. 4] A configuration diagram of a bobbin according to the first embodiment of this invention.

[Fig. 5] A configuration diagram of a bobbin according to a second embodiment of this invention.

[Fig. 6] A configuration diagram of a bobbin according to a third embodiment of this invention.

[Fig. 7] A configuration diagram of a bobbin according to a fourth embodiment of this invention.

[Explanation of symbols]

2 Rotor magnet 3 Rotor shaft 5 Inner yoke 5a Flange 6 Outer yoke 6a Slit 7 Half bobbin 8 Coils 20a, 20b Semicircular body 20c Hinge part

Claims (1)

[Scope of utility model registration request] 1. A coil bobbin mounted in a circumferential groove between the flanges of an inner yoke of an outer rotor type motor made of a magnetic material integrally having a plurality of flanges on the outer periphery of a central cylindrical portion, the coil bobbin comprising: a substantially C-shaped semicircular body that is integrally molded from plastic and fits into a substantially semicircular portion of the circumferential groove of the inner yoke; and a substantially C-shaped semicircular body that fits into the remaining semicircular portion of the circumferential groove. An outer rotor comprising a C-shaped semicircular body and a hinge portion that integrally connects one end of both semicircular bodies when the two semicircular bodies are combined in a ring shape. Coil bobbin for type motor.