JPH10225069A - Manufacture of magnet member, and magnet material, and motor using the magnet material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify the rust-preventive process and the save the space at transportation, by bonding and fixing a magnet member to a fixing member after performing preventive processing for at least surface layer of the magnet, using rust preventive oil. SOLUTION: For magnet material, a magnetic mixture is produced by winding up the magnetic powder to serve as the material of magnet member by the spiral flow being a coater in mixture process 1, and also, blowing resin to serve as a binder against the wound-up magnetic powder. Next, in compressive molding process II, the magnetic mixture is compressive-molded with a press to mold a magnet part, and then in hardening process III, it is heated for hardening, and in rust-preventive oil impregnation process IV, the magnet part is impregnated with rust preventive oil in vacuum. Then, the magnet part impregnated with rust-preventive oil is heated to evaporate the volatile components of the rust-preventive oil to complete a magnet 5, and it is carried to bonding process V. As a result, the rust preventive process is made efficient, and also the magnet and the fixing member can be transported separately, and the space saving at transportation becomes possible.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a method of manufacturing a magnet member used for a motor for driving a floppy disk drive (FDD), a digital audio disk drive (DAD), a printer, a facsimile, a video camera, and the like, and a magnet member. And a motor using the magnet member.

[0002]

2. Description of the Related Art Conventionally, a stepping motor of the same type as a small electric motor 31 as shown in FIG. 9 is used for a carriage such as an FDD or a DAD. Such an electric motor 31
Includes a stator portion 33 fixed to a plate 32 and a magnet member 35 as a rotor portion rotatably held on the plate 32 via a metal bearing 34. The magnet member 35 includes a rotating shaft 36 and a magnet 37. The magnet 37 includes a rotating shaft 36.
Is fixed at a position opposed to the stator portion 33. One end of the rotating shaft 36 is supported by a ball bearing 38.

A conventional magnet member 35 used in such an electric motor 31 is the first prior art in FIG.
0, the mixing step (I ′) → the pressing step (I
I ′) → curing step (III ′) → sealing step (I
V ′) → A magnet 37 formed by performing a predetermined treatment in each step of the rust prevention treatment step (V ′) is attached to the bonding step (V
I ′) is formed by being adhesively fixed to the rotating shaft 36.

First, in the mixing step (I ′), a magnetic powder as a raw material of the magnet 37 and an epoxy resin as a binder for bonding and solidifying the magnetic powder are mixed by the following method to form a magnetic mixture. Is generated. As the magnetic powder, a rare earth magnetic powder such as Nd (neodymium) -Fe (iron) -B (boron) or Sm2 (samarium) -Co17 (cobalt) is used. On the other hand, epoxy resin
It is composed of a main agent and a curing agent, and is used in which the main agent and the curing agent are previously mixed in appropriate amounts before mixing with the magnetic powder. Then, the magnetic powder thus configured is coated with the epoxy resin, that is, a spiral flow process is performed. That is, in a coating device (not shown), the magnetic powder is wound up, and an epoxy resin is sprayed on the wound magnetic powder, whereby the magnetic powder is solidified by the epoxy resin to form a magnetic mixture. Become.

[0005] The magnetic mixture thus formed is thoroughly dried, and then used to prevent the magnetic mixture from sticking to a mold when subjected to compression molding in the next pressing step (II '). Calcium stearate as a lubricant is slightly added. Note that the epoxy resin as a binder is stored in a dry state before coating the magnetic powder in order to prevent a decrease in adhesive strength when the magnetic powder is coagulated and adhered.

Next, in a pressing step (II '), the magnetic mixture produced in the mixing step (I') is subjected to compression molding to form a magnet as a part (this magnet has not undergone a predetermined step, ie, has an incomplete form). (Referred to as a magnet part).
That is, the magnetic mixture is filled in a mold formed in the shape of the magnet 37, and the magnetic mixture is pressed by a press (not shown). Then, the magnetic mixture immediately takes the shape of the magnet 37, and the magnetic mixture is removed from the press. The reason for adopting compression molding as a molding method is that in the case of compression molding, the ratio of the magnetic powder contained in the magnet can be increased as compared with injection molding, and the magnetic properties of the magnet are enhanced. Is possible.

Further, in the curing step (III ′), by heating the magnet component formed in the pressing step (II ′), the epoxy resin of the binder which is a thermosetting resin is solidified, and the magnet component is cured. Is done. In this magnet part, a slight gap is formed between magnetic powders solidified by the binder.
If the gap is left as it is, the lubricating oil for the bearing provided in the ball bearing portion 38 and the metal bearing 34 is diffused when the motor 31 is driven to form a gap between the magnetic powder of the magnet 37. It will penetrate into the gaps made.

As described above, when the bearing lubricating oil diffused from the ball bearing portion 38 and the metal bearing 34 enters the gap, the ball bearing portion 38 and the metal bearing 34
Insufficient lubricating oil for bearings reduces the bearing function, causing bearing loss and motor seizure. Therefore, it is necessary to fill this gap. In addition, it is necessary to fill the gap in order to prevent the adhesive from being sucked into the gap in the bonding step (VI ′) and insufficient bonding.

Therefore, in a sealing process (IV '), which is a process subsequent to the hardening process (III'), in order to fill gaps formed between the magnetic powders and to prevent intrusion of lubricating oil for bearings. Then, an anaerobic acrylic resin as an impregnating liquid is vacuum impregnated in a vacuum drying chamber into a gap formed in the magnet component. That is, the magnet component formed in the curing step (III ′) is washed, and then dipped in an acrylic resin liquid in a vacuum dryer.

Then, the magnet component takes in acrylic resin into the gap, and the gap between the magnet components is filled with the acrylic resin and filled. Next, in the magnet component thus vacuum impregnated with the acrylic resin, excess acrylic resin adhering to the surface is washed with a solvent having a good affinity for the acrylic resin. Further, heat is applied to the cleaned magnet component to cure the acrylic resin, thereby completing the sealing process (IV ′) of vacuum impregnating the magnet component with the acrylic resin.

As described above, the sealing treatment step (I
V ') passes through the rust-proofing process (V')
The surface is coated with an epoxy resin for preventing rusting. As a method of coating this epoxy resin, the surface of the magnet component is primed with an epoxy resin,
It is carried out by two spray coatings in which a top coat is applied after further drying. Then, after the epoxy resin for rust prevention is applied, the magnet component is entirely heated to dry and harden the epoxy resin on the surface. The magnet component formed in this manner is bonded and fixed to a predetermined position of the rotating shaft 36 with an adhesive in a bonding step (VI ′), and a magnet member 35 as a rotor unit is formed.

In addition, since the coating of the epoxy resin in the rustproofing step (V ') is troublesome and costly, the purpose is to make the rustproofing step (V') easier.
As in the second related art shown in FIG. 11, the magnet member 35 may be formed by a simple method. In the second prior art, in each of the steps from the mixing step (I ′) to the sealing processing step (IV ′), a predetermined process is performed on the magnet component in the same procedure as in the first prior art.

In the second prior art, a bonding step (V ″) is performed after the sealing step (IV ′).
That is, the magnet component, which has been completed up to the sealing process (IV ′), is bonded and fixed to a predetermined position of the rotating shaft 36 with an adhesive and a temporary magnet member (hereinafter, magnet member 35a)
Is formed). The thus configured magnet member 35a is coated with a rust-preventive oil for preventing rust on the surface of the magnet 37 in the rust-preventive treatment step (VI ") to form the magnet member 35 as a finished product. As a method for this application, the magnet member 35a is immersed in a rust-proof oil tank containing rust-proof oil,
This is performed by drying 5a to volatilize excess rust preventive oil.

If such a method is adopted, the application of the epoxy resin in the rust-proofing step (V ') in the first prior art described above is omitted, and the magnet member 35a is simply rust-proofed. The rust-proofing step (VI ") is completed only by immersing in an oil bath and drying, so that the rust-proofing step (VI") is extremely simplified. In addition,
In the second prior art, the rust prevention step (VI ") is performed after the bonding step (V"). It is considered that if the rust-preventive oil adheres to the fixed surfaces of the magnet 37 and the rotating shaft 36, it will hinder the adhesion between the magnet 37 and the rotating shaft 36.
Is fixed to the rotating shaft 36, and then the rustproofing process (V
I ″)).

[0015]

SUMMARY OF THE INVENTION As described above, the first
In the prior art, the rust prevention process (V ') takes time and effort, and the manufacturing cost of the magnet member 35 increases. Further, in the second conventional technique adopted to improve the first conventional technique, the following problem arises because the rust prevention treatment step (VI ") is performed after the bonding step (V"). Has occurred.

That is, when the manufacturing factory of the magnet member 35 and the assembly factory of the electric motor 31 are physically separated from each other, the magnet 37 needs to be rust-proofed at the manufacturing factory before being transported to the assembly factory. There is. The reason is that if the magnet 37 is not transported after being subjected to a rust proof treatment, there is a fear that a defect due to rust may occur during the transportation. Therefore, if the manufacturing method of the second conventional technique is adopted under these conditions, the magnet member 35 in which the magnet 37 is adhered and integrated with the rotating shaft 36 at the manufacturing factory is transported to the assembly factory. Therefore, compared with the case where the magnet 37 and the rotating shaft 36 are separately transported and the bonding process is performed in an assembly factory, it is necessary to increase the transport space, and the transport cost is increased.

Further, in the first and second prior arts, before the rust prevention treatment is applied to the magnet, the magnet is subjected to a sealing treatment so that lubricating oil for bearings enters the gaps formed between the magnetic powders. It is necessary to prevent this, and this step lengthens the manufacturing process, lowers the manufacturing efficiency, and increases the manufacturing cost. Furthermore, in the first and second prior arts, only the surface of the magnet 37 is subjected to rust prevention treatment for preventing rust, so that if the surface of the magnet 37 is damaged for any reason, There is a problem that the inside of the magnet 37 is oxidized from the damaged part and rust is generated.

In the first and second prior arts, in a sealing treatment step (IV ′), anaerobic acrylic resin is vacuum impregnated into gaps formed in the magnet component,
Excess acrylic resin is washed with solvent. Therefore, an epoxy resin mixed with magnetic powder as a binder of the magnet 37 swells with an acrylic resin, a solvent, or the like, which causes a problem that dimensional control of the magnet 37 is not easy.

In view of the above-described problems, the present invention simplifies the rust-proofing process of a magnet member and places a factory for manufacturing components such as a rotor magnet and a shaft and a factory for assembling a motor physically separated from each other. It is an object of the present invention to provide a method for manufacturing a magnet member that can save a space for transporting the magnet member even in a related case.

It is a further object of the present invention to provide a method for manufacturing a magnet member which can improve the manufacturing efficiency by simplifying the sealing process and shortening the entire manufacturing process. Another object of the present invention is to provide a method of manufacturing a magnet member that does not cause rust on the magnet even when the surface of the magnet is damaged. Still another object of the present invention is to provide a magnet member in which the dimension of the surface of the magnet can be easily controlled. Further, the present invention is advantageous in that the rust does not easily occur in the rotor portion, the bearing function can be maintained for a long period of time, and the dimensional control of the rotor portion can be easily performed. It is an object of the present invention to provide a motor capable of saving a space for transporting a magnet member even when the factory is physically separated from the factory.

[0021]

In order to achieve the above object, a method of manufacturing a magnet member according to the present invention is to fix a magnet manufactured by compression molding a mixture of magnetic powder and a resin serving as a binder. In a method of manufacturing a magnet member fixed to a member, at least a surface layer of the magnet is subjected to rust-preventive treatment using rust-preventive oil, and then the magnet and the fixing member are bonded and fixed.

According to a second aspect of the present invention, in addition to the first aspect, the surface layer and the inside of the magnet are rust-proofed by impregnating the magnet with a rust-preventive oil. . Further, in the manufacturing method of the magnet member according to the third aspect, in addition to the invention of the second aspect, the gap generated between the surface layer of the magnet and the inner magnetic powder is sealed simultaneously with the rust prevention treatment. Furthermore, the method for manufacturing a magnet member according to claim 4 is the method according to claims 1 and 2.
Or in addition to the invention described in 3, the magnetic powder is a rare earth magnet powder made of Nd (neodymium) -Fe (iron) -B (boron).

In view of the above-mentioned object, a magnet member according to a fifth aspect of the present invention provides a magnet formed by compression molding a mixture of magnetic powder and a resin serving as a binder, and bonding and fixing the magnet. A rust-proofing treatment with rust-proof oil is performed on a surface layer including at least a fixing surface of the magnet with the fixing member.

The magnet member according to claim 6 is
In addition to the fifth aspect of the present invention, the surface layer and the inside including the surface where the magnet is fixed to the fixing member are subjected to a rust-proof treatment with rust-proof oil. Furthermore, in the magnet member according to the seventh aspect, in addition to the invention according to the sixth aspect, the rust-preventive oil seals a gap generated in a surface layer including a fixing surface of the magnet with the fixing member and an inner magnetic powder. I have. Further, in the magnet member according to the eighth aspect, in addition to the invention according to the fifth, sixth or seventh aspect, the magnetic powder may be Nd (neodymium) -Fe (iron)-
It is a rare earth magnet powder made of B (boron).

In view of the above-mentioned object, a motor according to a ninth aspect of the present invention is configured such that the magnet of the magnet member according to any one of the fifth to eighth aspects is a rotor and the fixed member is a shaft. The magnet member is used as a rotor.

According to the first aspect of the present invention, at least the surface layer of the magnet is subjected to rust-preventive treatment using rust-preventive oil, and then the magnet and the fixing member are bonded and fixed. When the motor and the motor assembly factory are physically separated from each other, the magnet and the fixing member can be transported separately, and the transport space can be reduced compared to the conventional technology. Become.

According to the second aspect of the present invention, the surface layer and the inside of the magnet are rust-proofed by impregnation with a rust-preventive oil. Rust can be prevented from being generated from the damaged part. Further, according to the third aspect of the present invention, since the sealing treatment and the rust-prevention treatment of the surface layer and the inside of the magnet are performed at the same time, the production process of the sealing treatment and the rust-prevention treatment is significantly larger than that of the prior art. Is shortened to In addition, even when the magnet is damaged beyond the surface layer of the magnet, lubricating oil for bearings is prevented from penetrating into the surface layer and the inside of the magnet from the damaged area, and rust is prevented from being generated from the damaged area. Is done.

Further, according to the present invention, the magnetic powder is Nd (neodymium) -Fe (iron) -B (boron).
, The magnetic properties when the rotor magnet component is incorporated in the motor are excellent, and it is possible to provide a good rotor magnet.

According to the fifth aspect of the present invention, at least the surface layer including the fixing surface of the magnet is subjected to a rust-preventive treatment. As a result, the magnet member has a reduced space for transportation and a reduced manufacturing cost.

According to the sixth aspect of the present invention, the surface layer and the inside of the magnet are subjected to rust prevention treatment.
Even if the surface of the magnet is damaged, a magnet member that does not cause rust on the surface layer of the magnet can be provided. Furthermore, according to the invention of claim 7, since the surface layer and the inside of the magnet are sealed with rust-preventive oil, even if the magnet layer is damaged beyond the surface layer,
The lubricating oil for bearings is prevented from entering the gap of the magnet surface layer from the damaged portion and becoming insufficient. Further, it is possible to provide a magnet member in which the dimension of the surface of the magnet can be easily controlled without the swelling of the member serving as the binder.

Further, according to the invention of claim 8, the magnetic powder is Nd (neodymium) -Fe (iron) -B (boron).
, The magnetic properties when the rotor magnet component is incorporated in the motor are excellent, and a good magnet member is obtained.

According to the ninth aspect of the present invention, since the magnet member according to any one of the fifth to eighth aspects is incorporated in a motor as a rotor, rust occurs on the rotor. It is possible to provide a motor that is difficult to maintain bearing performance for a long period of time and that facilitates dimensional control of the rotor portion.

[0033]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a method of manufacturing a magnet member according to an embodiment of the present invention, a magnet member formed by the manufacturing method according to the embodiment of the present invention, and a motor using the magnet member will be described. 1
This will be described with reference to FIG.

Prior to the description of the magnet member manufacturing method and the magnet member, the motor 2 using the magnet member 1 obtained by this manufacturing method will be briefly described with reference to FIG. This motor 2 is a motor using the magnet member 1 according to the embodiment of the present invention. This motor 2 has the same configuration as the conventional electric motor 31 of FIG. 9 and is mainly composed of a stator section 3 and a rotor section 4. The magnet member 1 is used as the rotor unit 4. The magnet member 1 includes a magnet 5 as a rotor magnet.
And a shaft 6 serving as a fixing member for fixing the magnet 5
It is composed of The detailed structure of the motor 2 will be described later.

As shown in FIG. 1, the magnet member 1 is
Mixing step (I) → compression molding step (II) → curing step (I
II) → A magnet 5 formed by performing a predetermined process in each step of the rust-preventive oil impregnating step (IV) is bonded and fixed to a shaft 6 as a fixing member in a bonding step (V).

First, in the mixing step (I), a magnetic powder as a raw material of the magnet member 1 and a resin as a binder for bonding and solidifying the magnetic powder are mixed by the following method to form a magnetic mixture. . As the magnetic powder, a rare earth magnetic powder such as Nd (neodymium) -Fe (iron) -B (boron) or Sm2 (samarium) -Co17 (cobalt) is used. On the other hand, the resin serving as the binder is a thermosetting resin and is made of an epoxy resin that is completely cured at a temperature of about 100 ° C. or more. This epoxy resin is
It is composed of a main agent and a curing agent, and is used in which the main agent and the curing agent are previously mixed in appropriate amounts before mixing with the magnetic powder.

The magnetic powder thus configured and the resin serving as a binder are subjected to a coating treatment. That is,
The magnetic powder is wound up by a spiral flow, which is a coating device (not shown), and a magnetic mixture is generated by spraying a binder on the wound up magnetic powder. The mixing ratio between the magnetic powder of the magnetic mixture thus produced and the resin as the binder is about 98% by weight of the magnetic powder and about 2% by weight of the resin as the binder.

The magnetic mixture thus produced is thoroughly dried, and then a small amount of calcium stearate is added. The calcium stearate serves as a lubricant for preventing the magnetic mixture from sticking to the mold in the compression molding step (II). Then, the magnetic mixture generated in the mixing step (I) is carried to the compression molding step (II).

Next, in the compression molding step (II), the magnetic mixture is compression-molded by a press machine 7 as shown in FIG. Then, the magnetic mixture becomes the original shape of the magnet 5, that is, is formed into a magnet part 5a as shown in FIG. This press machine 7 is a rotary type continuous press machine and has a material tank 8 for storing materials.
And a mold 9 having a plurality of molds formed in the shape of a magnet part 5a serving as an original form of the magnet 5, and the mold 9
And a pressing die 10 that moves up and down with respect to the mold 9 in order to press the material filled in the mold.

Then, the magnetic mixture is charged into a material tank 8 of a press machine 7, filled into a plurality of molds 9 from the material tank 8, and pressed by a pressing die 10. At this time, the pressing time of the magnetic mixture by the pressing die 10 is about 0.7 seconds. by this,
The magnetic mixture becomes the magnet component 5a almost instantaneously,
The mold 9 is removed from the mold. As shown in FIG. 3, the magnet component 5a in this state is in a state where the resin serving as a binder is not completely solidified, and a gap S is formed between the surface layer of the magnet component 5a and the magnetic powder inside.
Exists. Then, in this state, the magnet component 5
a is carried to the curing step (III).

Next, in the curing step (III), the magnet component 5a formed in the compression molding step (II) is heated and cured. That is, as shown in FIG. 4, the magnet component 5 a is fixed to a rotating device 11 that is provided in a hot air drying chamber and applies hot air evenly to each part of the magnet component 5 a. Hot air is blown by the hot air dryer 12 while being rotated. The temperature of the warm air from the warm air dryer 12 is about 200 ° C., and the warm air is evenly applied to the magnet part 5a to any part for about 10 minutes or more. Note that the magnet component 5a may be simply placed in the hot air drying room without using the rotating device 11. In this case, it is preferable not to pile up the magnet components 5a in order to prevent an excessive rise in temperature of the magnet components 5a.

As described above, when hot air is applied to the magnet component 5a, the temperature of the magnet component 5a gradually increases, and after 10 minutes, the temperature of the magnet component 5a decreases by about 1
It reaches 00 ° C. When the temperature of the magnet component 5a reaches 100 ° C., the resin serving as a binder contained in the magnet component 5a is completely hardened and solidified to solidify and adhere the magnetic powder. In this way, in the curing step (III), the solidification and adhesion of the magnetic powder are reliably performed, thereby preventing the magnetic powder from peeling off the magnet 5. Thus, the magnet component 5a
By hardening a binder made of a thermosetting epoxy resin, the magnetic powder is bonded and solidified to form the magnet component 5a.

Next, in the rust preventive oil impregnation step (IV), the rust preventive oil 13 is vacuum impregnated into the magnet component 5a by the following method. The rust-preventive oil 13 is used for sealing the gap S formed between the surface layer of the magnet 5 and the magnetic powder inside and for rust-preventing the magnet 5.

As shown in FIG.
A bottle 16 containing rust-preventive oil 13 is installed in a vacuum drying chamber 15 which can be sucked in at 4 and evacuate the internal space. In the bottle 16, the magnet component 5a that has been subjected to a predetermined process in each step up to the curing step (III) is placed. In this state, when the air in the vacuum drying chamber 15 is exhausted by the pump 14 to make the internal space vacuum, the rust preventive oil 13 impregnates the gap S between the magnetic powder formed on the surface layer of the magnet component 5a and inside. Will be done.
Further, by heating the magnet component 5a impregnated with the rust-preventive oil 13 in this manner, the volatile components of the rust-preventive oil 13 are volatilized in the air, and the excess oil is removed to complete the magnet 5.

The magnet 5 thus completed is
The gap S formed in the surface layer and inside is filled with the rust-preventive oil 13. That is, the magnet 5 has been sealed. At the same time, the magnet 5
The surface layer and the inside are subjected to rust prevention treatment. Then, the magnet 5 is carried to a bonding step (V) for bonding and fixing the magnet 5 to the shaft 6. Since the magnet 5 has been rust-proofed at this time, the magnet 5 is transported to another factory located at a physically separated place, and the motor assembling step including the bonding step (V) is performed. It may be performed at a factory. At this time, since the magnet 5 is not adhered and fixed to the shaft 6, it has a shape that is easy to transport.

If the gap S in the magnet 5 is not filled at all, the following problem may occur.
That is, the motor 2 incorporating the magnet 5 includes:
As shown in FIG. 8, at one end of the shaft 6, a concave portion 6 a, a steel ball 18, and a bearing oil 19 filled in the vicinity of the concave portion 17 a are provided as radial and thrust bearings.
And a sliding bearing comprising: The motor 2 is provided with a metal bearing 27 as a bearing for supporting the intermediate portion of the shaft 6 in the radial direction, and the metal bearing 27 is also filled with bearing oil 27a.

If the magnet member 1 is incorporated into the motor 2 without filling the gap S between the magnets 5 at all, the bearing oil 19, 27a easily enters the gap S when flowing out of the bearing portion due to impact or the like. That is, since the bearing oils 19 and 27a move from the bearing portion to the gap S, the bearing oils 19 and 27a become insufficient in the bearing portion. In such a case, the slidability of the bearing is remarkably reduced, and the bearing becomes difficult to function smoothly. Therefore, bearing loss, wear of the bearing, and the like may cause seizure of the motor.

As shown in FIG. 6, when the rotor S 1 is assembled into the motor 2 without filling the gap S at all, the bearing oils 19 and 27a cause the gap S to be reduced.
The magnet 5 was incorporated into the motor 2 while the gap S was substantially filled with the rust-preventive oil by the rust-preventive oil-impregnating step (IV) of the present embodiment, while the amount of penetration was about 0.008 g. In this case, the amount of the bearing oils 19 and 27a entering the gap S is about 0.002 g.

As described above, when the rust-preventive oil is infiltrated into the gap S of the magnet 5 by vacuum impregnation so as to substantially fill the gap S, when the magnet 5 is incorporated into the motor 2, the concave portion 6a as a sliding bearing and The bearing oil 19 and the bearing oil 27a of the metal bearing 27 filled in the vicinity of the steel ball 18 penetrate into the gap S, and the bearing oil 19, 27a
Has an effect of preventing a phenomenon of flowing out of the bearing portion and becoming insufficient. Further, in the bonding step (V), it is possible to prevent the adhesive from being sucked into the gap S between the magnets 5 and to reduce the bonding strength.

Next, in the bonding step (VII), as shown in FIG. 7, the magnet 5 formed through each step as described above is first inserted into the shaft 6 through the insertion hole 5a. At this time, the insertion position of the magnet 5 is set at a position shifted from the end of the shaft 6 on the side where the recess 6a is located by a predetermined distance toward the other end. When or after the magnet 5 is inserted into the shaft 6, an adhesive is applied to the boundary between the inner peripheral surface of the insertion hole 5 a of the magnet 5 and the outer peripheral surface of the shaft 6, and the magnet as the rotor unit 4 is formed. The member 1 is fixed more firmly.

The rotor section 4 thus formed is
In the insertion hole 20a of the first yoke 20 and the insertion hole 21a of the second yoke 21 which are the central portions of the stator portion 3 of the motor 2 shown in FIG. The yoke 21 is inserted and assembled so as to face the pole teeth 21b.

The structure of the motor 2 shown in FIG. 8 is as follows. First, the stator portion 3 includes two coil bobbins 22 and 22 coaxially arranged in the axial direction, and first yokes 20 and 20 which are fixed to the outside of the coil bobbins 22 and 22 and also serve as a case. Coil bobbin 2
It is mainly composed of disk-shaped second yokes 21, 21 fixed back to back inside 2, 22, and windings 23, 23 wound on coil bobbin 22. The coil bobbin 22 is formed of an insulating member including a cylindrical winding body 24 and a flange 25 extending circumferentially outward from both axial ends of the winding body 24. Windings 23 each having a predetermined number of turns are wound around the outer periphery of the winding drum portion 24. Both ends of the winding 23 are connected to a power supply (not shown) so that power is supplied to the winding 23.

On the outside of one flange 25,
The first yokes 20, 20 are fixed respectively. The first yoke 20 is formed of a conductive metal member, and has a wall portion 20c extending from the outer circumferential end so as to surround one of the coil bobbins 22. In the vicinity of the center of the first yoke 20, an insertion hole 20a is formed.
Are provided on the inner peripheral side of the winding drum section 24 from the edge of the pole piece.

On the outside of the other flange portion 25,
The second yokes 21 and 21 are fixed so that they are back to back. The second yoke 21 is formed of a conductive metal member, and has an insertion hole 21a near the center.
And a plurality of pole teeth 21b bent from the edge of the insertion hole 21a toward the inner peripheral side of the winding drum portion 24. The pole teeth 20b and the pole teeth 21b of the first yoke 20 and the second yoke 21, which are fixed to the flange portions 25, 25, respectively, are arranged in a staggered manner on the inner periphery of the winding drum portion 24. . The first yoke 20 and the second yoke 21 are excited when power is supplied to the winding 23.

A mounting plate 26 for mounting the motor 2 to another device is fixed to one end of the stator portion 3 thus configured. An insertion hole 26a is provided in the center of the mounting plate 26, and a metal bearing 27 is fitted in the insertion hole 26a. Further, one first yoke 20 is provided on the other end side of the stator portion 3.
, A spring portion 29 formed by cutting and raising the center of the bearing plate 28, the steel ball 18 placed on the spring portion 29, and the spring portion 2.
And a cover 30 for closing an opening formed by cutting and raising 9 from the outside.

On the other hand, the rotor section 4 is constituted by a magnet member 1 comprising a shaft 6 and a cylindrical magnet 5 having an insertion hole 5a. That is, the magnet 5
After being manufactured as a magnetic member by the above-described method, it is magnetized, and then the shaft 6 is inserted into the insertion hole 5a.
The rotor unit 4 is configured by bonding and fixing the magnet 5 to one end of the shaft 6 (see FIG. 7).
The rotor section 4 is arranged with respect to the stator section 3 such that the magnet 5 faces the pole teeth 20b and 21b. When the pole teeth 20b and 21b are excited, the rotor section 4 is connected to the magnet 5 and the pole teeth 20b and 21b. The rotor portion 4 is rotated by a repulsive force or an attractive force due to a magnetic force generated therebetween.

A recess 6a is formed at one end of the shaft 6, and the vicinity of the recess 6a is filled with the bearing oil 19 as described above. The concave portion 6a is provided between the steel ball 18 placed on the spring portion 29 and the bearing oil 1.
The sliding bearing is constituted by contacting through the bearing 9. Further, the shaft 6 is constantly urged in the other end direction by the spring portion 29, and is configured to be movable in the axial direction. Further, the middle part of the shaft 6 is
The bearing is radially supported by a metal bearing 27 fitted in the bearing. Note that the radial dimension of the magnet 5 is formed to be larger than the insertion hole 26 a provided in the mounting plate 26, so that the rotor portion 4 is prevented from coming off in the direction of the mounting plate 26.

In the method of manufacturing a magnet member and the embodiment of the magnet member and the motor using the magnet member according to the present invention, the magnet member 1 is formed by the above-described method. Various changes can be made within the range not changed. For example, in the present embodiment, the magnet component 5a is impregnated with the rust-preventive oil 13 in a vacuum in the rust-preventive oil
Although the rust prevention treatment and the sealing treatment of the surface layer and the inside of a are performed simultaneously, the rust prevention treatment and the sealing treatment may be performed separately.

That is, in the same manner as in the first and second prior arts described above, after the magnet member 5a is subjected to each processing from the mixing step to the sealing step, the rust-preventive oil 13
May be fixed to the shaft 6 by performing the rust-prevention treatment according to the above. Regarding the rust prevention treatment, the surface layer and the inside of the magnet member 5a are not impregnated with rust prevention oil by vacuum impregnation, but the magnet member 5a is simply immersed in a rust prevention oil bath and only the surface layer of the magnet member 5a is subjected to rust prevention treatment. You may do it.

Although the motor 2 is configured as a so-called stepping motor as shown in FIG. 8, it is not particularly limited to the above-described configuration, but uses the magnet member 1 manufactured by the manufacturing method of the present invention. The type and the configuration of the motor are not limited as long as the motor performs the operation.

[0061]

As described above, in the method for manufacturing a magnet member according to the first, second, third and fourth aspects of the present invention, after the magnet is subjected to rust-proof treatment using rust-proof oil, the magnet and the fixing member are fixed. , The rust prevention process is more efficient, and even when the magnet member manufacturing plant and the motor assembly plant are physically separated from each other, the magnet and the fixing member Can be transported separately, and the transport space can be reduced as compared with the prior art.

According to the second aspect of the present invention, since the surface layer and the inside of the magnet are rust-proofed, even if the magnet layer is damaged beyond the surface layer, rust may be generated from the damaged portion. Is prevented. Furthermore, in the method for manufacturing a magnet member according to the third aspect, the rust prevention treatment and the sealing treatment are performed simultaneously, so that the manufacturing process of the sealing treatment and the rust prevention treatment is greatly shortened as compared with the prior art. As a result, the manufacturing efficiency is improved, and the manufacturing cost can be further reduced. Further, even when the magnet is damaged beyond the surface layer of the magnet, the lubricating oil for bearings is prevented from entering the gap formed inside the magnet from the damaged portion. With such a configuration, defects such as burn-in of the motor due to lack of oil are further reduced, and a highly reliable motor can be provided.

According to the present invention, since the magnet is subjected to the rust-preventive treatment with rust-preventive oil, the magnet and the fixing member are transported separately in manufacturing, so that the motor assembly factory As a result, the magnet member has a reduced space for transportation and a reduced manufacturing cost. According to the sixth aspect of the present invention, since the rust-preventive treatment with the rust-preventive oil is also applied to the inside of the magnet, even if the surface of the magnet is damaged, rust is generated on the magnet. This can be prevented.

According to the seventh aspect of the present invention, since the surface layer and the inside of the magnet are subjected to rust-preventive treatment and sealing treatment with rust-preventive oil, even if the magnet is damaged beyond the surface layer of the magnet, the bearing can be used. It is possible to prevent the lubricating oil for use from entering the gap formed inside the magnet from the damaged portion, and to provide a magnet member in which the dimension of the surface of the magnet can be easily controlled.

According to the motor of the ninth aspect, the magnet member according to any one of the fifth to eighth aspects is incorporated in the motor as a rotor part, so that rust does not easily occur on the rotor part. Bearing performance can be maintained for a long time,
In addition, a motor that facilitates dimensional control of the rotor can be provided.

[Brief description of the drawings]

FIG. 1 is a diagram showing steps of a method for manufacturing a magnet member according to an embodiment of the present invention.

2A and 2B are views for explaining a compression molding step in the embodiment of the present invention, wherein FIG. 2A is a perspective view showing a material tank and a mold, and FIG. FIG.

FIG. 3 is an overall perspective view showing the internal structure of the magnet component formed by the compression molding process shown in FIG. 2 with a part cut away, and an enlarged view showing a part with the part cut away;

FIG. 4 is a diagram for explaining a curing step in the embodiment of the present invention.

FIG. 5 is a diagram for explaining a rust-preventive oil impregnating step in the embodiment of the present invention.

FIG. 6 is a cross-sectional view of a motor using a magnet member impregnated with rust preventive oil and a motor using a magnet member not impregnated with rust preventive oil according to an embodiment of the present invention. It is the graph which showed the relationship of the quantity which enters a clearance gap.

FIG. 7 is a diagram for explaining a bonding step in the embodiment of the present invention.

FIG. 8 is a cross-sectional view of a motor using a magnet member manufactured by a method of manufacturing a magnet member according to an embodiment of the present invention as a rotor unit.

FIG. 9 is a sectional view showing an electric motor of the same type as a conventional stepping motor using a rotor magnet manufactured by a conventional manufacturing method.

FIG. 10 shows a first method of manufacturing a conventional magnet member.
FIG. 4 is a view showing the steps of the manufacturing method of FIG.

FIG. 11 shows a second method of manufacturing a conventional magnet member.
FIG. 4 is a view showing the steps of the manufacturing method of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Magnet member 2 Motor 4 Rotor part 5 Magnet (rotor magnet) 6 Shaft 13 Antirust oil S Clearance

Claims (9)

[Claims] 1. A method for manufacturing a magnet member, comprising fixing a magnet manufactured by compression molding a mixture of magnetic powder and a resin serving as a binder to a fixed member,
A method for manufacturing a magnet member, comprising subjecting at least a surface layer of the magnet to rust-preventive treatment using a rust-preventive oil, and then bonding and fixing the magnet and the fixing member. 2. The method of manufacturing a magnet member according to claim 1, wherein the magnet is impregnated with the rust-preventive oil to perform a rust-proof treatment on a surface layer and inside of the magnet. 3. The method for manufacturing a magnet according to claim 2, wherein a gap formed between a surface layer of the magnet and the magnetic powder inside the magnet is sealed simultaneously with the rust prevention treatment. 4. The magnetic powder according to claim 1, wherein the magnetic powder is Nd (neodymium) -F.
4. The method for manufacturing a magnet member according to claim 1, wherein the rare earth magnet powder is made of e (iron) -B (boron). 5. A magnet member comprising: a magnet formed by compression-molding a mixture of magnetic powder and a resin serving as a binder; and a fixing member formed by bonding and fixing the magnet. At least a surface layer including a fixing surface with the fixing member,
A magnet member characterized by being subjected to rust-proofing treatment with rust-proof oil. 6. The magnet member according to claim 5, wherein a surface layer and an inside of the magnet including a fixing surface with the fixing member are subjected to a rust-preventive treatment with the rust-preventive oil. 7. The magnet according to claim 6, wherein the rust-preventive oil seals a gap formed in a surface layer of the magnet including a fixing surface of the magnet with the fixing member and an inner portion of the magnetic powder. Element. 8. The magnetic powder according to claim 1, wherein the magnetic powder is Nd (neodymium) -F.
The magnet member according to claim 5, 6 or 7, wherein the magnet member is a rare earth magnet powder composed of e (iron) -B (boron). 9. The magnet member according to claim 5, wherein the magnet member is a rotor magnet, and the fixed member is a shaft, so that the magnet member is used as a rotor portion. And the motor.