JPH08308191A - Method for manufacturing rotor in claw-type rotating electric machine - Google Patents

Abstract

PURPOSE: To improve the workability of a cutting process by joining a capsule including cylindrical gas discharging bodies protruded from both bottom face sections of the capsule in a solid phase after evacuating the capsule to a vacuum state by discharging e gas from the capsule through the gas discharging bodies and cutting the gas discharging bodies. CONSTITUTION: In a first process, both bottom face sections of a cylindrical body 14 constituting a capsule are covered with lid bodies 15 from which thin hollow cylindrical gas discharging bodies 15a are respectively protruded after parent bodies 11a and 12a which become a pair of pawl type magnetic poles 11 and 12 are put in the cylindrical body 14 while a parent body 13a which becomes a nonmagnetic metallic body 13 is held between the parent bodies 11a and 12a. Then the capsule is evacuated to a vacuum state by discharging a gas from the capsule through the gas discharging bodies 15a and the front end sections of the bodies 15a are sealed. In a second process, the contacting faces of the parent bodies 11a, 12a, and 13a are joined to each other in a solid phase by mutual diffusion in the capsule. In a third process, the gas discharging bodies 15a are partially cut so that their remaining parts can become thin shaft sections 2a which are printed by the bearings 3 of a rotor 2 and necessary cutting work is also performed on the parent bodies 11a, 12a, and 13a also.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a rotor in a claw type rotating electric machine.

[0002]

2. Description of the Related Art Today, a rotating electric machine for rotating a rotor having a two-pole claw-shaped magnetic pole at an extremely high speed is being developed. As a method for manufacturing the rotor in that case, JP-B-56-4091, JP-A-62-62
No. 2,330,45 is known.

The former is a method of manufacturing by overlay welding between a pair of claw-shaped magnetic poles with a non-magnetic metal. However, in this method, when the non-magnetic metal is welded by overlay welding, the magnetic poles are melted, so that the boundary surface does not become a flat state, but becomes an uneven surface state.
The magnetic flux distribution becomes irregular and the electrical characteristics deteriorate.
There is a problem that vibration is likely to occur.

On the other hand, in the latter, the magnetic poles are sealed in a vacuum in a cylindrical capsule with a non-magnetic metal body sandwiched, and this is heated and pressed in an inert gas atmosphere to perform solid phase bonding. Since there is no problem like the former,
In this case, after solid-phase joining, the capsule is removed, and the solid-phase joined magnetic pole and non-magnetic metal body are cut into a required shape to form a claw-shaped magnetic pole. It is said that when both ends of the die pole are machined to a small diameter to form a small-diameter shaft portion that is axially supported on the casing side, the cutting allowance is large and the workability is impaired, and the capsule and the generated cutting waste are also wasted. There's a problem.

[0005]

SUMMARY OF THE INVENTION The present invention was conceived with the object of providing a method for manufacturing a rotor in a claw-type rotary electric machine that can eliminate these drawbacks in view of the above-mentioned circumstances. Attention, in a cylindrical capsule,
A first step of encapsulating a pair of magnetic poles in a vacuum state with a non-magnetic metal body sandwiched between them, a second step of heating and pressurizing this in an inert gas atmosphere for solid phase bonding, and a solid phase bonding In manufacturing the claw-shaped magnetic pole having the third step of subjecting the object to the necessary cutting process, in the first step, the inside of the capsule is removed from the cylindrical gas discharge body protruding from both bottom surfaces of the capsule. After the gas is discharged to make a vacuum state and then the gas discharger is sealed, in the second step, solid phase bonding is performed including the sealed gas discharger. The step (1) is characterized by including a step of cutting the gas discharge body to form a small-diameter shaft portion supported by the bearing of the claw-shaped magnetic pole.

According to the present invention, with this structure, the manufacture of the claw-shaped magnetic pole can be simplified and the waste of the material can be reduced as much as possible.

[0007]

Next, an embodiment of the present invention will be described with reference to the drawings. In the drawings, reference numeral 1 is a casing of a claw-type rotating electric machine (generator), and the casing 1 is formed of a magnetically permeable material to form a magnetic path. A small-diameter shaft portion 2a of a rotor (rotor) 2 manufactured by the method is rotatably supported by a bearing 3. Reference numeral 4 denotes a stator having axially opposite ends supported by support members 5 and 6 formed from a non-magnetic material on the inner peripheral surface of the casing 1. A plurality of teeth 4a whose tips are opposed to each other on the outer peripheral surface of the rotor 2 with a slight gap are provided in a protruding manner, and slots 4 formed between these adjacent teeth 4a.
A stator coil 7 is wound around b. Reference numeral 8 denotes a cylindrical magnetic path member integrally provided on the inner surfaces of both bottom surface portions of the casing. The inner peripheral surface of the magnetic path member 8 closely opposes the outer peripheral surface of the rotor 2, and the outer peripheral surface An excitation coil 9 for exciting the rotor 2 is wound. In addition, one small diameter shaft portion 2a of the rotor 2 protruding from the casing 1
Is linked to a drive source (not shown), and is set to rotate at high speed by power input from the drive source. In the figure, 16 is a coolant inlet, 17 is a coolant outlet, 18 is a partition plate arranged in the gap between the stator 4 and the rotor 2, and the support members 5 and 6 are provided with cooling liquid. Flow paths 5a and 6a for flowing the liquid are formed.

The rotor 2 is formed of a pair of claw-shaped magnetic poles 11 and 12 facing each other and a non-magnetic metal body 13 sandwiched between the magnetic poles 11 and 12. In this structure, one of the magnetic poles 1 is excited by exciting the exciting coil 9.
When the rotor is rotated in a state in which 1 is an N pole and the other magnetic pole 12 is an S pole, a magnetic path as shown by an arrow in FIG. 1 is formed, and electromagnetic induction of the stator coil 7 based on the magnetic path generates electricity. All of the above are the same as conventional ones. Reference numeral 20 denotes a terminal terminal to which the coil end portion of the stator coil 7 is connected.
Is attached to the casing 1 in a penetrating manner inside and outside through a pair of inner and outer insulating materials 21 having a sealing material 21a in the middle.

Next, a method of manufacturing the rotor 2 will be described. First, in the first step, a cylindrical body that forms a capsule with a mother body 13a that is a non-magnetic metal body 13 is sandwiched between the mother bodies 11a and 12a that form the pair of claw-shaped magnetic poles 11 and 12, respectively. After being placed in the member 14, the bottom surface portions of the tubular member 14 are attached to the small-diameter hollow tubular gas discharge body 1
The lid 15 is provided with a protruding projection 5a. By the way, the lid 1
For fixing 5 to the tubular member 14, appropriate welding means such as TIG welding can be adopted. After doing so, the air in the capsule is discharged from the gas discharger 15a to make the inside of the capsule a vacuum state, and thereafter, the tip of the gas discharger 15a is sealed.

Next, in the second step, the one in which the sealed gas discharge body 15a is still provided is put into a heating furnace filled with an inert gas such as argon gas, and the temperature is raised. By raising the pressure to 1100 ° C. and the pressure to 1200 kg / cm ² and maintaining this state for several hours, the mother bodies 11a, 12a, and 13a in the capsule are solid-phase bonded by their mutual contact surfaces by mutual diffusion. The constituting cylindrical member 14 and lid 15 are also solid-phase bonded to the opposing mother body, and the gas discharge body 15a is in a solid state in which the gas discharge passage is closed by diffusion. Then, the temperature is lowered to collect argon gas and the capsule is taken out.

Finally, in the third step, the capsules taken out are cut and processed. In this case,
The portion corresponding to the gas discharge body 15a is cut so as to become the small-diameter shaft portion 2a axially supported by the bearing 3 of the rotor 2, and
The necessary cutting processing is performed also on the respective mother portions 11a, 12a, 13a, and the rotor 2 is manufactured by this.

In the embodiment of the present invention constructed as described above, when the rotor 2 is manufactured by using the solid phase joining method, the small-diameter shaft portion 2a on which the rotor 2 is axially supported by the bearing 3 is Since it is formed by using the small-diameter gas discharge body 15a provided in the lid body 15 as it is to make the inside of the capsule a vacuum, it has a large cutting allowance like the one formed by cutting the conventional magnetic pole bodies 11a and 12a. There is no end. As a result, the workability of the cutting process of the small-diameter shaft portion 2a is improved, and a large amount of cutting chips can be avoided.

Further, in this one, the gas discharge body 15
When a is made of a non-magnetic metal body, the small-diameter shaft portion 2a becomes a non-magnetic body, and it is avoided that this becomes a magnetic path. As a result, the formation of the magnetic path passing through the small-diameter shaft portion 2a and the bearing 3 is eliminated, and the quality of members such as the bearing 3 and the sealing material is protected, and at that portion, for example, as in the above-described embodiment, the rotor 2 is provided. When sensors such as the rotational position detection sensor 19 are provided, these sensors can be protected from magnetism.

The present invention is not limited to the above embodiment, but when the diameter of the small-diameter shaft portion of the rotor is formed to be large, the gas discharge body formed on the lid of the capsule is By inserting one end of a rod body made of a magnetic metal or a non-magnetic metal and bringing the insertion end of the rod body into contact with the base body and performing the second step, the base body and the rod body And the capsule are solid-phase-bonded to each other, so that they can be formed on the shaft portion having a large diameter.

[0015]

In summary, since the present invention is constructed as described above, the small-diameter shaft portion of the rotor which is rotatably supported by the bearing is a capsule when the rotor is formed by the solid phase joining method. Since a small-diameter gas exhaust body provided to create a vacuum inside is formed by solid-phase bonding,
Unlike the conventional method of cutting the magnetic pole part, the cutting allowance does not become large, making it possible to perform the work process of the small diameter shaft part with good workability and reduce the cutting waste, which also improves the cost. Can be measured.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional side view of a claw-type rotating electric machine.

FIG. 2 is a sectional front view of a claw-type rotating electric machine.

FIG. 3 is an explanatory view showing a manufacturing process of a rotor.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Casing 2 Rotor 2a Small shaft part 3 Bearing 4 Stator 7 Stator coil 11 Magnetic pole 11a Base 12 Magnetic pole 13 Non-magnetic metal body 14 Cylindrical member 15 Lid 15a Gas discharge body 16 Coolant inlet 17 Coolant outlet

Claims (2)

[Claims] 1. A first step of enclosing a pair of magnetic poles in a vacuum state in a cylindrical capsule so as to sandwich a non-magnetic metal body, and solid-state bonding by heating and pressing this in an inert gas atmosphere. In manufacturing the claw-shaped magnetic pole by including the second step of performing the solid cutting and the third step of performing the necessary cutting process on the solid-phase bonded product, in the first step, the protrusions are formed from both bottom surface portions of the capsule. There is a step of discharging the gas in the capsule from the installed cylindrical gas discharge body to make it in a vacuum state, and then sealing the gas discharge body. In the second step, the sealed gas discharge body is included. Solid phase joining is included, and the third step is characterized by including a step of cutting the gas discharge body to form a thin shaft portion supported by the bearing of the claw-shaped magnetic pole. A method for manufacturing a rotor in a claw-type rotating electric machine. 2. The method for manufacturing a rotor in a claw-type rotating electric machine according to claim 1, wherein the capsule is made of a non-magnetic metal body.