JP2003230238A - Motor component and motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a motor which is less prone to be harmfully influenced by poor junction between a permanent magnet and a supporting member therefor, and motor components which allow the formation of the motor. <P>SOLUTION: A rotor 1 has a yoke 2, permanent magnets 3, and a rotating shaft 4. The permanent magnets 3 comprise a magnet body 31 and a metallic layer 32 formed on at least part of the surface thereof. The yoke 2 and the metallic layers 32 are metallically bonded together, and thereby the permanent magnets 3 are supported and secured on the yoke 2. The metallic bond is formed by brazing or welding. The metallic layer 32 is preferably constituted of a material containing Ni. The yoke 2 is preferably constituted of stainless steel or a material mainly containing Al. The average thickness of the metallic layer 32 is preferably between 1 to 50 μm inclusive. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a motor component and a motor.

[0002]

2. Description of the Related Art Generally, a motor has a rotor and a stator. Some rotors have a structure in which a permanent magnet is fixed to a yoke.

In such a conventional rotor, the permanent magnet and the yoke are joined by an organic adhesive. However, with conventional adhesives, the adhesive strength varies widely, and in some cases, some or all of the joints may peel off during long-term operation. When such peeling occurs, problems such as abnormal noise and abnormal vibration occurring when the motor is driven, and deterioration of the torque characteristics of the motor occur.
Further, when the above-mentioned peeling progresses, the permanent magnet and the yoke are separated from each other, which causes a problem that the motor is broken or damaged. Such a problem is likely to occur especially in a high torque motor.

Further, in the conventional rotor as described above, in the manufacturing process, the excess organic adhesive sometimes squeezes out from between the permanent magnet and the yoke to the rotor end surface. Such an excess organic adhesive is usually designed with a motor structure in which the excess adhesive is dimensionally tolerable, but the excess adhesive on the end face is subjected to centrifugal force, vibration, and torque fluctuation due to the rotation of the rotor. Since it is directly subjected to the circumferential acceleration due to, peeling, breakage, and falling occur. A part of the adhesive that has fallen off may remain in the motor and adversely affect the motor.

[0005]

SUMMARY OF THE INVENTION An object of the present invention is to provide a motor which is less likely to be adversely affected by a defective joint between a permanent magnet and a supporting member thereof, and a motor component capable of providing the motor. To provide.

[0006]

The above objects are achieved by the present invention described in (1) to (12) below.

(1) A motor component having a permanent magnet having a metal layer on at least a part of its surface and a support member for supporting the permanent magnet, wherein the metal layer is metal-metal bonded to the support member. Accordingly, the motor component, wherein the permanent magnet is supported and fixed to the support member.

(2) The permanent magnet and the support member are joined by brazing or welding.
Motor parts described in.

(3) The motor component according to (1) or (2), wherein the metal layer is made of a material containing Ni.

(4) The average thickness of the metal layer is 1 to 1
The motor component according to any one of (1) to (3) above, which has a size of 00 μm.

(5) The motor component according to any one of the above (1) to (4), wherein the metal layer is formed by electroplating.

(6) The motor component according to any one of the above (1) to (4), wherein the metal layer is formed by electroless plating.

(7) The motor component according to any one of (1) to (6) above, wherein the metal layer is a laminate of two or more layers formed by electroplating and / or electroless plating.

(8) The motor component according to any one of the above (1) to (7), wherein at least the portion of the supporting member that is coupled to the permanent magnet is made of a metal or an alloy material.

(9) The motor component according to any one of (1) to (8), wherein the permanent magnet is a bonded magnet.

(10) The motor component according to any one of (1) to (9) above, which is a rotor.

(11) A motor comprising the motor component described in any one of (1) to (10) above.

(12) The motor according to (11) above, which is a DC motor.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION Preferred embodiments of a motor component and a motor according to the present invention will be described below with reference to the accompanying drawings.

First, a preferred embodiment of the motor component of the present invention will be described. FIG. 1 is a sectional side view showing a preferred embodiment of a motor component (rotor) according to the present invention.

As shown in FIG. 1, a rotor (rotor) 1
Is composed of a yoke 2, a permanent magnet 3 joined to the outer peripheral surface side of the yoke 2 (support member), and a rotary shaft 4 fitted in the central portion of the yoke 2.

The yoke 2 is mainly made of a metal or alloy material. Examples of the material forming the yoke 2 include stainless steel, Al, free-cutting steel, brass, and sintered alloys. At least the portion in contact with the permanent magnet 3 is mainly stainless steel, Al, or free-cutting steel. It is preferably composed of materials. This allows the yoke 2
Is a metal layer 3 having sufficient mechanical strength and described later.
The bonding strength (adhesion) with 2 becomes particularly excellent.

As the stainless steel, for example, SUS
304, SUS303, SUS316, SUS316
Fe of L, SUS316J1, SUS316J1L, etc.
Cr-Ni type alloy, SUS405, SUS420J2,
SUS430, SUS434, SUS444, SUS4
29, Fe-Cr type alloys such as SUS430F, and the like. Further, as the free-cutting steel, for example, SUM11, S
UM12, SUM21, SUM22, SUM22L, S
UM23, SUM23L, SUM24L, SUM25,
SUM31, SUM31L, SUM32, SUM41,
Examples include SUM42 and SUM43.

The permanent magnet 3 is a ring-shaped magnet body 3
1 and a metal layer 32 formed on the surface thereof.

The magnet body 31 is magnetized in multiple poles. As the magnet body 31, for example, any magnet such as a cast magnet, a sintered magnet, a bond magnet, rolling, forging, and hot extrusion may be used, and among them, a bond whose shape can be inexpensively manufactured for a rotor. Magnets are preferred. This allows
Excellent magnetic characteristics can be stably obtained.

The bond magnet is mainly composed of magnet powder and a binder resin (binder).

As the magnetic powder constituting the bonded magnet,
For example, a rare earth magnet powder containing a rare earth element, a transition metal and boron as basic components is preferably used.

Rare earth magnet powder (hereinafter simply referred to as "magnet powder")
(Also referred to as) is preferably made of an alloy containing a rare earth element and a transition metal, and particularly, the following [1] to [6]
Is preferred.

[1] R (where R is at least one of rare earth elements including Y) and a transition metal mainly containing Co as basic components (hereinafter referred to as R—Co alloy) To tell).

[2] R (where R is at least one of rare earth elements including Y), a transition metal (TM) mainly containing Fe, and B as basic components (hereinafter,
R-TM-B type alloy).

[3] R (provided that R is at least one of rare earth elements including Y), a transition metal (TM) mainly containing Fe, and an interstitial element mainly containing N Components (hereinafter referred to as R-TM-N-based alloy).

[4] R (where R is at least one of rare earth elements including Y) and transition metals such as Fe (T
M) as a basic component, and a soft magnetic phase and a hard magnetic phase are adjacent to each other (including a case where they are adjacent to each other through a grain boundary phase) (in particular, there is a nanocomposite structure) With.

[5] A mixture of at least two of the compositions [1] to [4]. In this case, it is possible to have the advantages of each magnet powder to be mixed, and it is possible to easily obtain desired magnetic characteristics.

[6] The composition of the above [1] to [4]
Of these, at least one and ferrite powder (for example, B
aO ・ 6Fe_TwoO_ThreeSuch as Ba-ferrite, SrO ・ 6
Fe _TwoO_ThreeSuch as Sr-ferrite and some of these
Transition metals, those substituted with rare earth elements, etc.)
thing. In this case, it has the advantages of each magnet powder to be mixed.
It is possible to obtain desired magnetic characteristics easily.
It

Typical R-Co alloys are:
Examples thereof include SmCo ₅ and Sm ₂ TM ₁₇ (where TM is a transition metal).

Typical R-TM-B type alloys are Nd-Fe-B type alloys, Pr-Fe-B type alloys, and N-Fe-B type alloys.
d-Pr-Fe-B type alloy, Nd-Dy-Fe-B type alloy, Ce-Nd-Fe-B type alloy, Ce-Pr-Nd-
Fe-B based alloys, some of Fe in these are Co, N
Examples thereof include those substituted with other transition metals such as i.

A typical R-TM-N-based alloy is Sm ₂ Fe ₁₇ N prepared by nitriding an Sm ₂ Fe ₁₇ alloy.
_3, TbCu ₇ type phase as the main phase Sm-Zr-Fe-Co
-N-based alloys may be mentioned.

As the rare earth element, Y, La and C are used.
e, Pr, Nd, Pm, Sm, Eu, Gd, Tb, D
Examples thereof include y, Ho, Er, Tm, Yb, Lu, and misch metal, and one or more of these may be included. Examples of the transition metal include Fe, Co, Ni and the like, and one or more of these may be included.

In addition, in order to improve magnetic properties such as coercive force and maximum magnetic energy product, or to improve heat resistance and corrosion resistance, the magnetic material may contain A if necessary.
l, Cu, Ga, Si, Ti, V, Ta, Zr, Nb,
It is also possible to contain Mo, Hf, Ag, Zn, P, Ge, Cr, W and the like.

As the binder resin (binder),
Examples thereof include thermoplastic resins and thermosetting resins.

Examples of the thermoplastic resin include polyamide (eg, nylon 6, nylon 46, nylon 66, nylon 610, nylon 612, nylon 11, nylon 12, nylon 6-12, nylon 6-66), thermoplastic polyimide. , Liquid crystal polymers such as aromatic polyester, polyphenylene oxide, polyphenylene sulfide, polyethylene, polypropylene, polyolefin such as ethylene-vinyl acetate copolymer, modified polyolefin, polycarbonate, polymethyl methacrylate, polyethylene terephthalate, polyester such as polybutylene terephthalate, poly Ether, polyetheretherketone, polyetherimide, polyacetal, etc.
Further, copolymers, blends, polymer alloys and the like containing these as main constituents may be mentioned, and one kind or a mixture of two or more kinds thereof may be used.

Such a thermoplastic resin can be selected in a wide range depending on its type, copolymerization and the like, for example, one in which moldability is emphasized, one in which heat resistance and mechanical strength are emphasized. There is an advantage.

On the other hand, examples of the thermosetting resin include various epoxy resins such as bisphenol type, novolac type and naphthalene type, phenol resin, urea resin, melamine resin, polyester (unsaturated polyester) resin, polyimide resin and silicone resin. , Polyurethane resin, etc., and one kind or a mixture of two or more kinds of them can be used.

The thermosetting resin used (uncured)
May be liquid at room temperature or solid (powdered).

The magnetic characteristics of the magnet body 31 are not particularly limited, but the magnetic energy product (BH) _max is 3
2 kJ / ^{m 3} or more of, more preferably 48kJ / ^{m 3} or more of, more preferably 64kJ / ^{m 3} or more.

In the illustrated structure, the metal layer 32 covers the entire surface of the magnet body 31, but at least a part of the surface of the magnet body 31 (at least a portion contacting with the yoke (support member)). Part).
In this case, the metal layer 32 is preferably formed at least on the entire inner surface side of the magnet body 31.

In the present invention, the magnet body 31 is
Needless to say, a chamfered corner may be used.

A metal layer 32 is formed on at least a part of the surface of the magnet body 31. The metal layer 32 is mainly composed of a metal material.

By providing such a metal layer 32, as described later in detail, it is possible to form an intermetallic bond having a high bonding strength between the permanent magnet 3 and the yoke 2 (support member). . As a result, when the rotor 1 is applied to a motor (in particular, a high torque motor, a motor used repeatedly, a motor used continuously for a long period of time, etc.),
It is possible to more effectively prevent the bonded portion between the permanent magnet 3 and the yoke 2 from peeling off. As a result, it is possible to more effectively prevent problems such as the generation of abnormal noise during driving of the motor and the deterioration of the torque characteristics of the motor. Further, by effectively preventing the peeling as described above, the motor 10 having the rotor 1 is less likely to be damaged or damaged and has excellent reliability.

Further, by providing the metal layer 32, the corrosion of the magnet body 31 can be prevented more effectively. As a result, the motor 10 has stable characteristics over a long period of time.

As the metal material forming the metal layer 32,
For example, Ni, Cu, Cr, Fe, Zn, Cd, Sn,
Examples thereof include Pb, Al, Au, Ag, Pd, Pt, Rh, and the like, and alloys containing at least one of these. Among these, it is preferable that the metal material forming the metal layer 32 is mainly Ni. As a result, the adhesion (bonding strength) between the magnet body 31 and the yoke 2 becomes particularly excellent.

The average thickness of the metal layer 32 is not particularly limited, but is preferably 1 to 50 μm, and 5 to 40 μm.
Is more preferable.

When the average thickness of the metal layer 32 is within the above range, the adhesiveness (bonding strength) between the magnet body 31 and the yoke 2 is further improved.

As a method of forming the metal layer 32, for example,
Wet plating methods such as electroplating, immersion plating, electroless plating, vacuum deposition, sputtering, thermal CVD, plasma C
Examples include chemical vapor deposition (CVD) such as VD and laser CVD, dry plating such as ion plating, and thermal spraying. Among these, wet plating is preferable, electroplating,
Electroless plating is more preferred. By using wet plating as a method of forming the metal layer 32, a uniform metal layer 32 having excellent adhesion (bonding strength) to the magnet body 31 and the yoke 2 (support member) can be formed with a relatively simple apparatus. It can be easily formed. Such an effect becomes more remarkable when electroplating or electroless plating is used.

In electroplating, the composition of the metal layer (metal plating layer) 32 to be formed can be easily adjusted by adjusting the composition of the plating solution. As a result, for example, the corrosion resistance of the metal layer 32 and the magnet body 3
1, the affinity for the yoke 2 (support member) and the like can be easily adjusted.

In electroplating, the film thickness, density, etc. of the metal layer 32 can be easily adjusted by adjusting the electrolysis conditions such as the current density.

The electroplating is preferably performed under the following conditions, for example. The bath temperature during electroplating is not particularly limited, but is preferably 20 to 70 ° C,
It is more preferably 40 to 65 ° C.

When the bath temperature is less than the lower limit value described above, a decrease in plating rate, uneven gloss, and abnormal precipitation are likely to occur. On the other hand, when the bath temperature exceeds the above upper limit, abnormal precipitation and decomposition of the brightener are likely to occur.

The current density during electroplating is
It is not particularly limited, but is preferably 0.1~8.0A / dm ^2, and more preferably 0.5~6.0A / dm ^2.

When the current density is a value within the above range, the metal layer 32 having excellent adhesion (bonding strength) with the magnet body 31 and the yoke 2 (supporting member) and efficiently forming a uniform and dense metal layer 32 is formed. can do.

In electroless plating, the film thickness and density of the metal layer (metal plating layer) 32 to be formed can be easily adjusted by adjusting the liquid temperature, the plating time and the like. As a result, for example, the corrosion resistance physical properties of the metal layer 32,
The affinity to the magnet body 31 and the yoke 2 (support member) can be easily adjusted.

Further, in the electroless plating, the metal layer 32 having a uniform film thickness can be formed on a cylindrical material to be plated such as the magnet body 31 without any special adjustment.

The electroless plating is preferably performed under the following conditions, for example. The bath temperature during electroless plating is not particularly limited, but as an example, in the case of nickel-boron-based electroless plating, it is preferably 50 to 70 ° C, and more preferably 55 to 65 ° C.

If the bath temperature is less than the lower limit value, the plating rate tends to decrease and abnormal precipitation tends to occur. On the other hand, the bath temperature is
When it exceeds the upper limit, the bath solution is likely to be decomposed.

Prior to the formation of the metal layer 32, the surface of the magnet body 31 may be pretreated. Examples of the pretreatment include blast treatment, alkali washing (alkali degreasing treatment), acid washing, water washing (including pure water washing), organic solvent washing, ultrasonic washing, and bombarding. By performing such pretreatment, for example, the adhesion between the magnet body 31 and the metal layer 32 can be further improved.

The composition of each portion of the metal layer 32 may or may not be constant. For example, the metal layer 32 may be one whose composition changes gradually (gradient material) along its thickness direction.

The metal layer 32 is formed by, for example, a forming method,
It may be a laminate of a plurality of layers having different formation conditions and compositions.

The permanent magnet 3 as described above is supported and fixed to the yoke 2 by the metal layer 32 being metal-metal bonded to the yoke 2 (support member).

As described above, the present invention is characterized in that the permanent magnet is supported and fixed to the support member by the intermetallic bond formed between the metal layer and the support member.

The intermetallic bond formed between the metal layer and the support member has a greater bonding strength than the conventional organic adhesive bond. Therefore, when the rotor 1 is applied to a motor (in particular, a high torque motor, a motor used repeatedly, a motor used continuously for a long period of time, etc.),
It is possible to more effectively prevent the bonded portion between the permanent magnet 3 and the yoke 2 from peeling off. As a result, it is possible to more effectively prevent problems such as the generation of abnormal noise during driving of the motor and the deterioration of the torque characteristics of the motor. Further, by effectively preventing the peeling as described above, the motor 10 having the yoke 2 is less likely to be damaged or damaged, and has excellent reliability.

The intermetallic bond as described above may be formed over the entire contact surface between the metal layer and the supporting member, or may be formed partially. When the metal-to-metal bond is formed on a part of the contact surface, it is preferable that the metal-to-metal bond is formed at substantially even positions in the circumferential direction. As a result, the joining between the permanent magnet 3 and the yoke 2 becomes particularly stable.

Examples of the method for forming the intermetallic bond include brazing, welding, pressure welding and the like. Of these, brazing or welding is particularly preferable. As a result, the bonding strength between the permanent magnet 3 and the yoke 2 can be made particularly excellent.

As a brazing material used for brazing, for example,
Solder, silver solder, copper solder, phosphorous copper solder, brass solder, aluminum solder, nickel solder, and the like can be used, and they can be appropriately selected and used according to the constituent material of the metal layer 32, the constituent material of the yoke 2, and the like.

As the welding, resistance welding, arc welding, plasma welding, spot welding or the like can be used.

The rotary shaft 4 is usually made of a metal material such as stainless steel. As stainless steel, for example, S
US304, SUS303, SUS316, SUS31
Fe such as 6L, SUS316J1 and SUS316J1L
-Cr-Ni system alloy, SUS405, SUS420J
2, SUS430, SUS434, SUS444, SU
Fe-Cr type alloys such as S429 and SUS430F are listed.

On the tip side of the rotary shaft 4 (lower side in FIG. 1),
A groove 41 for fixing a pulley, an impeller, etc. is provided.

Next, a preferred embodiment of the motor of the present invention will be described. FIG. 2 is a sectional side view of a motor having the motor component (rotor) shown in FIG.

As shown in FIG. 2, a motor (DC motor)
The reference numeral 10 includes the rotor (rotor) 1, the stator (stator) 5, and the casing 6 described above.

The stator 5 is composed of a core 51 made of a laminated body of silicon steel plates punched into a desired shape, and a coil (three-phase coil) 52 formed by winding the core 51.

The casing 6 has an end bracket 61.
, A top bracket 62, a housing 63, and a closing member 64.

A bearing support portion (bearing house) 611 for supporting the bearing 7 of the rotating shaft 4 of the rotor 1 is formed near the inner center of the end bracket 61. A bearing (bearing) 7 is fitted and fixed to the bearing support portion 611.

A bearing support portion (bearing house) 621 for supporting the bearing 8 of the rotary shaft 4 of the rotor 1 is formed near the center of the inside of the top bracket 62. The bearing 8 (bearing) is fitted and fixed to the bearing support portion 621.

The rotary shaft 4 is rotatably supported by the bearing 7 fitted in the bearing support portion 611 of the end bracket 61 and the bearing 8 fitted in the bearing support portion 621 of the top bracket 62. . The outer peripheral surface of the permanent magnet 3 faces the inner peripheral surface of the stator 5 via a predetermined gap (gap).

In such a motor 10, by energizing the coil 52 of the stator 5 via a conductor wire (not shown), the core 51 is excited and torque is generated in the rotor 1. In this case, the energization of the coil 52 is controlled based on the detection signal from the rotor position sensor that detects the position of the rotor 1, preferably by a motor drive control means (not shown) including an inverter.

As described above, in the present invention, the permanent magnet 3 and the yoke 2 (supporting member) are connected by the metal-to-metal connection having a high bonding strength, so that even when torque is generated in the rotor 1. It is possible to more effectively prevent peeling off of the joint portion between the permanent magnet 3 and the yoke 2. As a result, it is possible to more effectively prevent problems such as the generation of abnormal noise during driving of the motor and the deterioration of the torque characteristics of the motor. Further, by effectively preventing the peeling as described above, the motor 10 having the yoke 2 is provided.
Is less likely to cause failure or damage, and has excellent reliability.

The present invention is preferably applied to a high torque motor. Thereby, the effect of the present invention becomes more remarkable. That is, as in the conventional case, even when a permanent magnet and a supporting member thereof have a small joint strength, even in a high torque motor that is difficult to realize due to problems such as reliability,
The present invention can be suitably applied.

In the illustrated configuration, the motor 10 is a DC motor. When the motor 10 is such a DC motor, the effect of the present invention becomes more remarkable. That is,
Since a DC motor generally has a high maximum torque, the present invention can be applied more suitably.

Although the motor component and the motor of the present invention have been described above based on the illustrated embodiment, the present invention is not limited to this.

For example, in the above-described embodiment, the metal layer 3
Although 2 covers the entire surface of the magnet main body 31, it may be formed on at least a part of the surface of the magnet main body 31 (at least a part of a portion in contact with the yoke (support member)). In this case, the metal layer 32 is preferably formed at least on the entire inner surface side of the magnet body 31.

Further, on the surface of the yoke 2 (support member),
A metal layer having the same composition as the metal layer 32 formed on the surface of the magnet body 31 may be formed. Thereby, the bonding strength between the permanent magnet 3 and the yoke 2 (support member) can be further increased.

The motor component of the present invention is not limited to the rotor, and may be any component.

Further, in the above-described embodiment, the structure in which the supporting member is the yoke has been described, but the supporting member is not limited to this, and may be, for example, a rotating shaft, a casing or the like.

The motor to which the present invention is applied is a DC
It is not limited to a motor and may be of any type.

Further, the bearing of the motor to which the present invention is applied is not limited to the rolling bearing, and may be, for example, a sliding bearing.

[0095]

EXAMPLES Next, specific examples of the present invention will be described.

[Manufacture of Rotor (Motor Parts)] (Example 1) A rotor (motor parts) as shown in FIG. 1 was manufactured as follows.

First, if the alloy composition is (Nd _0.7 P
r _0.3 ) _10.5 Fe _bal. A magnet powder represented by B ₆ , an epoxy resin, and a small amount of a hydrazine-based antioxidant were mixed, and these were kneaded at room temperature for 30 minutes to prepare a composition for a bonded magnet (compound).

At this time, the compounding ratios (weight ratios) of the magnet powder, the epoxy resin and the hydrazine-based antioxidant were 97.5 wt%, 1.3 wt% and 1.2 wt%, respectively.

Next, this compound was weighed and filled in the mold of the press machine, and the pressure was 13 at room temperature in the absence of a magnetic field.
After compression molding at 70 MPa, the epoxy resin was cured by heating at 170 ° C. for 1 hour to obtain a cylindrical bonded magnet. This bonded magnet was subjected to a polishing treatment in the height direction, and the outer diameter was 28.2 mm and the inner diameter was 26.2.
A cylindrical bonded magnet having a size of mm × height 4.6 mm. After that, the bonded magnet was subjected to barrel polishing so that each ridge had a radius of R0.
It was ground to 2 and used as a magnet body.

Next, the obtained magnet body was washed. As the cleaning of the magnet body, first, alkali cleaning (alkali degreasing treatment) is performed at 60 ° C. for 5 minutes, followed by pure water ultrasonic cleaning for 2 minutes, acid cleaning (5 wt% hydrochloric acid) for 1 minute, and pure water ultrasonic cleaning. Washing was carried out for 2 minutes.

A metal layer made of Ni was formed on the surface of the magnet body thus washed. The metal layer was formed by electroplating. The bath temperature and current density of the plating solution in electroplating are 50 ° C. and 0.5, respectively.
It was A / dm ² .

The average thickness of the metal layer thus formed was 25 μm on the outer peripheral side and 18 μm on the inner peripheral side.

A yoke made of free-cutting steel (SUM21) and a rotary shaft made of stainless steel (SUS420J2) were prepared, and the rotary shaft was fitted in the center of the yoke.

Next, a permanent magnet was joined to the outer surface of the yoke to form an intermetallic bond between the metal layer and the yoke, to obtain a rotor (motor component) as shown in FIG. .

The permanent magnet and the yoke were joined by brazing as described below. First, after heating the yoke in which the rotating shaft was fitted, solder was applied to the outer surface of the yoke.

Next, the yoke was inserted into the hollow portion of the permanent magnet in a heated state and then cooled to form an intermetallic bond on almost the entire contact surface between the permanent magnet and the yoke.

The permanent magnet coupled to the yoke as described above was magnetized to have 6 poles. The maximum magnetic energy product (BH) _max of the permanent magnet was 75.6 kJ / m ³ .

Example 2 A yoke made of Al was used as the yoke, and the average thickness of the metal layer was 27 μm on the outer peripheral side.
A rotor was manufactured in the same manner as in Example 1 except that the inner peripheral side was 20 μm.

(Comparative Example) An epoxy resin coating was applied to the surface of the magnet body manufactured in the same manner as in Example 1. That is, a permanent magnet was manufactured in the same manner as in Example 1 except that an epoxy resin layer was formed instead of the metal layer composed of Ni.

A yoke made of free-cutting steel (SUM21) and a rotary shaft made of stainless steel (SUS420J2) were prepared, and the rotary shaft was fitted in the center of the yoke.

The permanent magnet obtained as described above was adhered to the outer surface side of the yoke into which the rotary shaft was fitted.

Adhesion between the permanent magnet and the yoke was performed as follows. First, an organic adhesive (XNR3506 (product name), manufactured by Nagase Chemtex Co., Ltd.) was applied to each of the outer surface of the yoke into which the rotary shaft was fitted and the inner surface of the permanent magnet.

Next, this yoke is inserted into the hollow portion of the permanent magnet, and in that state, a thermosetting treatment is carried out at 100 ° C. for 1 hour, so that the permanent magnet and the yoke are almost entirely contacted with each other. Glued.

After the bonding, it was confirmed that the surplus adhesive protruding from between the permanent magnet and the yoke did not interfere with other members, and no particular treatment such as shaving was performed. After that, the permanent magnet was magnetized into 6 poles.

[Evaluation of Rotor] With respect to the rotor manufactured as described above, the adhesive strength between the permanent magnet and the yoke was measured.

The measurement of the adhesive strength was carried out using a tensile compression tester (made by Imada Seisakusho). The results are shown in Table 1.

[Manufacture and Evaluation of Motor] A motor as shown in FIG. 2 was manufactured by using the rotor manufactured in each of the examples and comparative examples.

For each motor thus obtained, the energization operation to the coil of the stator (energization time: 30 seconds, maximum rotation speed: 4500 rpm, repetitive operation) was performed 500 times.
Repeated 00 times.

Then, each motor was disassembled, and the joint between the permanent magnet and the yoke was visually and microscopically observed.

The results are evaluated according to the following four-step criteria.
evaluated. ⊚: No peeling is observed at the joint between the permanent magnet and the yoke by visual observation or observation with a microscope. ◯: No peeling is observed at the joint between the permanent magnet and the yoke by visual observation. Δ: A slight peeling is observed at the joint between the permanent magnet and the yoke by visual observation. X: Visual observation clearly shows separation at the joint between the permanent magnet and the yoke. The results are shown in Table 1.

[0121]

[Table 1]

As is clear from Table 1, in the rotor (motor component) obtained in the present invention, the bonding strength between the permanent magnet and the yoke (supporting member) was large, and the variation was small. Further, in the motor manufactured by using these rotors, the permanent magnet is reliably supported and fixed to the yoke (supporting member) even after being used for a long period of time.

From these results, it can be seen that according to the present invention, it is possible to provide a highly reliable motor in which the adverse effect due to the permanent magnet being separated from the yoke (support member) is unlikely to occur.

On the other hand, in the rotor (motor component) obtained in the comparative example, the bonding strength between the permanent magnet and the yoke (supporting member) was small, and the variation was large. In addition, in the motor of the comparative example, the joint strength between the permanent magnet and the yoke (support member) was reduced by repeated use.

Further, in the motor of the comparative example, the abnormal noise started to be generated when the number of energizing operations reached about 20,000 times. This abnormal noise occurs when the number of energizing operations is about 3
It has become especially large since it reached the 0000th time.

Further, when the motor of the comparative example was disassembled after the above-mentioned energization operation, the residue of the organic adhesive was present inside the motor.

[0127]

As described above, according to the present invention, it is possible to provide a motor which is unlikely to be adversely affected by a defective joint between a permanent magnet and a supporting member thereof, and a motor for which the motor can be provided. Parts can be provided.

In particular, the present invention can be preferably applied to a motor used in a high torque range, which has been difficult to apply conventionally.

Further, the reliability of the motor is further improved by appropriately selecting the constituent material of the supporting member, the constituent material of the metal layer, the forming conditions of the metal layer and the like and combining them.

[Brief description of drawings]

FIG. 1 is a cross-sectional side view showing a preferred embodiment of a motor component (rotor) of the present invention.

FIG. 2 is a cross-sectional side view of a motor having the motor component (rotor) shown in FIG.

[Explanation of symbols]

1 ... Rotor 2 ... Yoke 3 ... Permanent magnet 31 ...
… Magnet body 32 …… Metal layer 4 …… Rotating shaft 5 …… Stator 51 …… Core 52 …… Coil 6 …… Casing 61 …… End bracket 611 …… Bearing support part 62 …… Top bracket 621 …… Bearing support Part 63 ... Housing 64 ... Blocking member 7 ...
Bearing 8 ... Bearing 10 ... Motor

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Isao Kokonoki             Seiko, 3-3-3 Yamato, Suwa City, Nagano Prefecture             -In Epson Corporation (72) Inventor Tadashi Kobe             Seiko, 3-3-3 Yamato, Suwa City, Nagano Prefecture             -In Epson Corporation F-term (reference) 5H621 AA03 AA04 BB07 BB10 GA01                       GB10 HH03                 5H622 AA04 CA05 CA10 DD02 QA02

Claims (12)

[Claims] 1. A motor component comprising a permanent magnet having a metal layer on at least a part of a surface thereof, and a support member supporting the permanent magnet, wherein the metal layer is metal-metal bonded to the support member. The permanent magnet is supported and fixed to the support member by the above. 2. The motor component according to claim 1, wherein the permanent magnet and the support member are joined by brazing or welding. 3. The motor component according to claim 1, wherein the metal layer is made of a material containing Ni. 4. The average thickness of the metal layer is 1 to 100 μm.
The motor component according to any one of claims 1 to 3, wherein m is m. 5. The motor component according to claim 1, wherein the metal layer is formed by electroplating. 6. The motor component according to claim 1, wherein the metal layer is formed by electroless plating. 7. The motor component according to claim 1, wherein the metal layer is a laminate of two or more layers formed by electroplating and / or electroless plating. 8. The motor component according to claim 1, wherein at least a portion of the support member that is coupled to the permanent magnet is made of a metal or an alloy material. 9. The motor component according to claim 1, wherein the permanent magnet is a bond magnet. 10. The motor component according to claim 1, wherein the motor component is a rotor. 11. A motor comprising the motor component according to any one of claims 1 to 10. 12. The motor is a DC motor.
The motor according to 1.