JP3451655B2 - Rotating electric machine - Google Patents

Description

Detailed Description of the Invention

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotating electric machine equipped with a magnetic closing member for closing a slot opening and a method for manufacturing the same.

[0002]

2. Description of the Related Art In a rotary electric machine, in order to fix and seal a winding wound in a slot of an iron core, a wedge is fitted to close the slot opening. If this wedge is not a magnetic material, due to the non-uniformity of the magnetic flux density in the slot and teeth of the iron core,
Vibration and noise occur during rotation, and output torque fluctuates. Therefore, there is a wedge formed of a magnetic material.

[0003]

However, as shown in FIG. 5, there is a problem that a magnetic flux short circuit loop c is formed between adjacent magnetic poles b through the magnetic wedge a, which is disadvantageous in the magnetic circuit. The present invention has been made to solve the above-mentioned problems, and is a rotating electric machine in which magnetic flux leaking between core teeth is reduced.
And a method for producing the same.

[0004]

In order to achieve the above object, the invention as set forth in claim 1 provides a rotating electric machine equipped with a magnetic closing member for bridging between the core teeth to close the slot opening. <br/> nonmagnetic tissue by transformation by a heat treatment in the magnetic closure member locally forms a, wherein rotary electric machine a substantially central positions the said nonmagnetic structure between the core teeth bridging
To do . In the invention according to claim 2, bridging between the core tooth portions
With a magnetic closing member that closes the slot opening with
Machine manufacturing method, austenitic stainless steel
The magnetic closing member is formed from the rolled steel plate of
Non-magnetic structure is locally formed by transformation by treatment,
The non-magnetic tissue is located between the bridging core teeth
Attach the magnetic closure member to the slot opening so that
And a method of manufacturing a rotating electric machine. Claim 3
In the invention according to claim 2, in the method for manufacturing a rotary electric machine according to claim 2, between the iron core tooth portions bridging the non-magnetic tissue.
Place the magnetic closure member in the slot so that it is located approximately in the center.
It is characterized in that it is attached to the opening. Claim 4
Of the invention, the manufacturing of the rotating electric machine according to claim 2 or 3.
In the method, the heat treatment is performed by irradiating with a laser beam.
It is characterized by performing. In the invention according to claim 5, the contract
The rotating electric machine manufacturing method according to claim 4,
The beam of the magnetic closing member
By transforming the central part, the non-magnetic structure can be formed into a band shape.
And are characterized.

[0005]

In the rotating electric machine, a magnetic closing member, which is heat-treated to locally form a non-magnetic structure, is attached, the core tooth portions are bridged, the slot openings are closed, and the bridge is bridged. Since the non-magnetic tissue is located approximately in the center between the iron core teeth, the magnetic resistance to the effective magnetic flux flowing from the iron core teeth to the gap side is the magnetic closing member bridging the effective magnetic flux between the iron core teeth. It becomes smaller because it passes through the magnetic part.
Further, with respect to the leakage magnetic flux flowing between the iron core teeth through the bridged magnetic closing member, the magnetic resistance becomes extremely large because of the non-magnetic tissue locally formed in the magnetic closing member, and the magnetic circuit is increased. Is cut off.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS (First Embodiment) The first embodiment of the present invention is shown in FIGS.
This will be described with reference to FIG. FIG. 1 is a perspective view of the magnetic wedge 1. In general, austenitic stainless steel transforms from a non-magnetic material to a ferromagnetic material (work-induced martensite) by cold working, and when heated at high temperature after this transformation, it transforms into an austenitic structure and becomes a non-magnetic material. Have. Therefore, the magnetic wedge 1 of the present embodiment is formed of a rolled austenitic stainless steel plate. The material is rolled into a predetermined thickness by cold working, and both ends of the material cut into a predetermined width are sharpened to form the wedge portions 2, and the elongated holes 3 are punched at predetermined intervals in the width direction. Then, a heat treatment of irradiating the central portion in the width direction with a laser beam to locally heat it to a high temperature is performed. By this heat treatment, the central portion in the width direction is transformed and the non-magnetic structure 4 is formed in a band shape.

FIG. 2 is a sectional view of a part of the stator core 11. The slots 12 are formed at regular intervals, and an insulating member 13 is lined inside. A coil 14 is wound inside the slot 12. After the insulating member 17 for insulating between the magnetic wedge 1 and the coil 14 is mounted, the wedge portion 2 of the magnetic wedge 12 is mounted in the mounting groove 16 formed in the corresponding inner surface of the tip end portion of the iron core tooth portion 15 between the adjacent slots 12. Is charged. Magnetic wedge 1
Is fixed by press-fitting or by adhesive after being mounted. The magnetic wedge 1 bridges the adjacent iron core teeth 15 and closes the opening 12a of the slot 12, so that the nonmagnetic tissue 4 formed on the magnetic wedge 1 is located at the center of the opening 12a.

The thickness of the magnetic wedge 1 is preferably 1/4 to 1/2 of the tooth width W of the iron core tooth portion 15. Further, the width of the strip-shaped non-magnetic tissue 4 formed on the magnetic wedge 1 is preferably 2 to 4 times the gap length between the tip of the iron core tooth portion 15 and the rotor (not shown).

In the rotary electric machine using the stator iron core 11 having the above structure, the effective magnetic flux flowing from the iron core tooth portion 15 bridged by the magnetic wedge 1 to the air gap side passes through the ferromagnetic portion of the magnetic wedge 1. Reluctance becomes small. On the other hand, the core tooth portion 15
For the magnetic circuit of the leakage flux from the magnetic wedge 1 through the magnetic wedge 1 to the adjacent iron core tooth portion 15, since the non-magnetic tissue 4 is locally formed in the magnetic wedge 1 substantially at the center in the width direction, The resistance becomes so large that the magnetic circuit is cut off. Further, since the holes 3 elongated in the width direction are punched out at predetermined intervals in the magnetic wedge 1 to increase the electric resistance, the eddy current loss due to the alternating magnetic flux does not increase. Further, since the magnetic wedge 1 is mounted and fixed in the mounting groove 16 of the iron core tooth portion 15, it is not necessary to narrow the opening 12a smaller than the width of the slot 12 in order to prevent the magnetic wedge 1 from falling off. Therefore, the winding work of the coil 14 becomes easy.

(Second Embodiment) FIG. 3 is a perspective view of a magnetic wedge 21 according to a second embodiment. A magnetic plate material 23 having a predetermined shape having a wedge portion 22 at its tip is punched out from a rolled austenitic stainless steel plate transformed into a ferromagnetic material by cold working. Then, the magnetic plate members 23 are laminated and both sides of the central portion are integrally joined by welding to form the magnetic wedge 21. The band-shaped welded portion 24 is transformed into a non-magnetic structure due to a high temperature during welding, and is a joint and non-magnetization treatment performed at the same time.

(Third Embodiment) FIG. 4 is a sectional view of a part of a stator core 31 showing a third embodiment. Similar to the first embodiment, the slots 32 are formed at regular angular intervals, and an insulating member 33 is lined. A coil 34 is wound inside the slot 32. An insulating member 35 is attached so as to close the opening 32a of the slot 32. Then, the magnetic ring member 36 fitted in the stator iron core 31 bridges the tips of the adjacent iron core teeth 37, and the slots 32
The opening 32a is closed.

Similar to the second embodiment, the magnetic ring body 36 is obtained by punching and laminating a ring-shaped magnetic plate material from a rolled austenitic stainless steel rolled steel sheet transformed into a ferromagnetic body by cold working and slotted. 32 are welded at intervals of forming angles and integrally joined. The axial band-shaped welded portion 38 transforms into a non-magnetic structure due to the high temperature during welding. The welded portion 38 is positioned so as to be positioned in the middle of the openings 32a of the slots 32 and fitted into the stator core 31, and the openings 32a of all the slots 32 can be closed by one action.

[0013]

The rotating electric machine of the present invention has the above-mentioned structure, and since the magnetic closing member has a small magnetic resistance in the thickness direction and a large magnetic resistance in the width direction, the iron core tooth portion does not increase the leakage magnetic flux. It is possible to reduce the non-uniformity of the magnetic flux density between the air gaps and the air gaps, suppress vibration and noise, and reduce the iron loss due to the pulsating magnetic flux.

[Brief description of drawings]

FIG. 1 is a perspective view of a magnetic wedge according to a first embodiment.

FIG. 2 is a sectional view of a part of the stator core of the first embodiment.

FIG. 3 is a perspective view of a magnetic wedge according to a second embodiment.

FIG. 4 is a sectional view of a part of a stator core showing a third embodiment.

FIG. 5 is a cross-sectional view of a part of a conventional stator core.

[Explanation of symbols]

1,21 ... magnetic wedge 4 ... Non-magnetic tissue 11, 31 ... Stator core 12, 32 ... slots 12a, 32a ... opening 15, 37 ... Iron core teeth 24, 38 ... Welded part 36 ... Magnetic ring

─────────────────────────────────────────────────── --Continued from the front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) H02K 3/493

Claims (5)

(57) [Claims] 1. A rotating electrical machine equipped with a magnetic closing member for bridging between core teeth to close a slot opening, wherein a non-magnetic structure is locally formed on the magnetic closing member by transformation by heat treatment , and bridging. The non-magnetic tissue is located substantially in the center between the iron core teeth. 2. A slot opening is formed by bridging between core teeth.
In the manufacturing method of the rotating electric machine equipped with the magnetic closing member for blocking
Te, said magnetic by rolling steel austenitic stainless steel
Of the elastic closing member, and by the transformation by heat treatment
A non-magnetic tissue is locally formed, and the non-magnetic tissue is located between the bridging core teeth.
Attach the magnetic closure member to the slot opening so that
A method of manufacturing a rotating electric machine, comprising: 3. The iron core in which the nonmagnetic structure is bridged.
Place the magnetic closure member so that it is located approximately in the center between the teeth.
The device is mounted in the slot opening.
A method for manufacturing a rotating electric machine according to. 4. A laser beam is irradiated to perform the heat treatment.
The rotary electric machine according to claim 2 or 3, characterized in that
Machine manufacturing method. 5. The magnet is irradiated by the laser beam.
Of the non-magnetic material by transforming the central portion of the elastic closing member in the width direction.
The tissue according to claim 4, wherein the tissue is formed in a band shape.
Manufacturing method of the rotating electric machine.