JP2000060036A - Stator core of dynamoelectric machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the stator core of a dynamoelectric machine with which the ease of a work for inserting coil conductors into slots can be realized, while restraining the complexity of a teeth assembly work. SOLUTION: The protruding part of respective teeth 11 for the constriction of slots 12 is integrally formed on a cylindrical part 2 made of soft magnetic thin plates. With this constitution, a dynamoelectric machine which has the small magnetic reluctance of a gap between a stator, and a rotor can be formed only by inserting the cylindrical part 2 in an axial direction after coil conductors are inserted into the slots 12 and facilitating for inserting the coil conductors into the slots 12 can be realized, while the complexity of a teeth assembly work is suppressed. Furthermore, since the cylindrical part 2 has high magnetic reluctance parts 3 at positions corresponding to the center parts in the circumferential direction of the slots 12, leakage flux between adjacent teeth can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stator core of a rotating electric machine having soft magnetism and made of an electromagnetic laminated steel sheet or the like.

[0002]

2. Description of the Related Art A major problem with rotating electric machines, especially stators, is that the operation of inserting a coil conductor into a slot having a narrow opening is not easy. Another problem is that the slot insertion of the coil conductor is not easy, so that the coil conductor cannot have a large cross-sectional area. For this reason, loss and heat generation due to an increase in coil resistance are inevitably increased. is there.

Of course, if the opening of the slot is not narrowed, the insertion of the coil conductor becomes easy, but the magnetic field cross-sectional area of the gap portion having a small magnetic permeability decreases, and the magnetic resistance of the rotating electric machine greatly increases. It is conventionally known that a problem of an increase in cogging torque is caused. In order to solve this problem, Japanese Patent Laid-Open Publication No. Hei 10-145990 discloses that a separate tooth portion that fits with the base tooth portion is separately provided for the ring-shaped base tooth portion on the yoke side. A tooth-divided stator core that narrows the opening of a slot into which a coil conductor has been inserted has been proposed.

[0004]

However, in the above-mentioned tooth-divided stator core, the separate tooth portion needs to be fixed for each tooth, so that the operation of inserting the coil into the slot is facilitated. A new problem arises in that the assembly work becomes complicated. The present invention has been made in view of the above problems, and an object of the present invention is to provide a stator core of a rotating electric machine that realizes an easy operation of inserting a coil conductor into a slot while suppressing the complexity of teeth assembly work. And

[0005]

According to the stator core of the rotating electric machine according to the first aspect of the present invention, the projecting portion for narrowing the slot of each tooth is collectively formed by the cylindrical portion made of a soft magnetic thin plate. After inserting a coil conductor into a slot having a large opening, a rotating electric machine with a small magnetic resistance in a gap between a stator and a rotor can be formed only by inserting the cylindrical portion in the axial direction, and the teeth assembly work is complicated. This facilitates the operation of inserting the coil conductor into the slot while suppressing the formation of the coil conductor.

Further, since the cylindrical portion is located at the center in the circumferential direction of the slot and has a high magnetic resistance portion, the magnetic flux leaking between adjacent teeth can be reduced. According to the configuration of the second aspect, in the stator core of the rotating electric machine according to the first aspect, the high magnetic resistance portion is formed by a wedge-shaped portion formed from the outer peripheral surface of the cylindrical portion and having a wedge-shaped cross section. Excellent in practicality because it can be manufactured by simple press working.

According to a third aspect of the present invention, in the stator core of the rotating electric machine according to the first aspect, the high magnetic resistance portion is formed of a thin portion thinner than other portions of the cylindrical portion. Since it can be manufactured by simple press working, it is excellent in practicality, and the magnetic resistance against the leakage magnetic flux of the thin portion can be increased, and the leakage magnetic flux can be reduced.

According to a fourth aspect of the present invention, in the stator core of the rotating electric machine according to the first aspect, since the high magnetic resistance portion has a long groove formed in the axial direction of the core, it is manufactured by a simple punching process. It is practical because it can be done, and
The magnetic reluctance of the long groove in the core circumferential direction can be increased, and the leakage magnetic flux can be reduced. According to a fifth aspect of the present invention, in the stator core of the rotating electric machine according to any one of the first to fourth aspects, the cylindrical portion is further made of a magnetic material that becomes non-magnetic by heat treatment, and the high magnetic resistance portion is heated. Since it is formed by processing, a high magnetic resistance portion can be easily formed.

According to a sixth aspect of the present invention, in the stator core of the rotary electric machine according to any one of the first to fifth aspects, a thin soft magnetic plate is further spirally laminated in the axial direction of the core to form a cylinder. Since the portion is formed, eddy current loss in the cylindrical portion can be reduced.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the stator core of the rotating electric machine according to the present invention will be described with reference to the following embodiments.

[0011]

Embodiment 1 A stator core according to Embodiment 1 will be described below with reference to FIG. FIG. 1 is a partial front view of the stator core after the teeth assembly is completed. The stator core has a core main part 1 made of a laminated electromagnetic steel sheet having teeth 11 and slots 12 on the inner peripheral part, and a soft core that is in close contact with the inner peripheral surface of the core main part 1 and covers the opening of the slot 12. A cylindrical portion 2 is formed of a magnetic thin plate. The cylindrical portion 2 has a high magnetic resistance portion 3 having a high magnetic resistance and located at the center in the circumferential direction of the opening of the slot 12.

The cylindrical portion 2 is formed in a cylindrical shape by laminating a soft iron plate or an electromagnetic steel plate having a rectangular cross section and a narrow line shape in the axial direction of the core main portion 1 and bonding with a resin or the like. The high magnetic resistance section 3 is formed from a wedge-shaped section formed from the outer peripheral surface of the cylindrical section 2 and having a wedge-shaped cross section. This wedge-shaped portion may be formed by cutting after forming the cylindrical portion 2 into a cylindrical shape,
Preferably, the narrow wire soft iron plate is press-formed at a predetermined distance before being formed into a cylindrical shape, and the narrow wire soft iron plate is wound around a drum or the like and their axial positions are aligned. It is easier.

In assembling the stator, a coil (not shown) is inserted into the slot 12 of the core main part 1 from the opening of the slot 12, and then the cylindrical part 2 is pushed in while being in contact with the inner peripheral surface of the core main part 1. In addition, at the time of this pushing,
It is also possible to use the above-mentioned drum used for winding a thin linear soft iron plate, push it in, and then remove this drum again.

[0014]

Embodiment 2 Another embodiment will be described with reference to FIG. In this embodiment, the high magnetic resistance portion 3 of the cylindrical portion 2 shown in FIG. 1 is a thin portion (less than 1/4) thinner than other portions. Even in this case, the same operation and effect as those of the first embodiment can be obtained.

[0015]

Embodiment 3 Another embodiment will be described with reference to FIGS. In this embodiment, the high magnetic resistance portion 3 of the cylindrical portion 2 shown in FIG. 1 is formed by connecting a plurality of long grooves 31 formed in a line in the axial direction of the core main portion 1 and connecting portions formed between the long grooves 31 and at both ends. 32
It is composed of

According to this method, it is possible to easily manufacture the semiconductor device by using a very simple punching process before or after forming the cylindrical shape.

[0017]

Embodiment 4 Another embodiment will be described with reference to FIG. In this embodiment, the high magnetic resistance portion 3 of the cylindrical portion 2 shown in FIG.
A magnetic material that becomes non-magnetic by heat treatment as the material of the cylindrical part. Here, a rolled austenitic stainless steel sheet is used, and the high magnetic resistance part is composed of a non-magnetic region formed by heat treatment with a YAG laser pulse. It is.

The YAG laser pulse may be irradiated before or after forming the cylindrical shape, and may be irradiated from both sides or from one side. Furthermore, irradiation may be performed after the cylindrical portion 2 is pushed into the core main portion 1, and in this case, the positioning of the high magnetic resistance portion 3 is simplified.

[Brief description of the drawings]

FIG. 1 is a partial front view of a stator core of a rotating electric machine according to a first embodiment.

FIG. 2 is a partial front view of a stator core of a rotary electric machine according to a second embodiment.

FIG. 3 is a partial front view of a stator core of a rotating electric machine according to a third embodiment.

FIG. 4 is a partial plan view of the vicinity of a high magnetic resistance portion 3 of a stator core of a rotating electric machine according to a third embodiment.

FIG. 5 is a partial front view of a stator core of a rotary electric machine according to a fourth embodiment.

[Explanation of symbols]

1 is a core main part, 2 is a cylindrical part, 3 is a high magnetic resistance part, 11 is a tooth, and 12 is a slot

Claims (6)

[Claims] 1. A cylindrical portion made of a soft magnetic core having an inner peripheral portion having slots and teeth, and a soft magnetic thin plate that is in close contact with the inner peripheral surface of the core main portion and covers the opening of the slot. Wherein the cylindrical portion has a high magnetic resistance portion having a high magnetic resistance located at a central portion in a circumferential direction of the opening of the slot. 2. The rotating electric machine according to claim 1, wherein the high magnetic resistance portion has a wedge-shaped portion formed from an outer peripheral surface of the cylindrical portion and having a wedge-shaped cross section. Stator core. 3. The stator for a rotating electric machine according to claim 1, wherein said high magnetic resistance portion is formed to be thinner than other portions of said cylindrical portion. core. 4. The stator core of a rotating electric machine according to claim 1, wherein said high magnetic resistance portion has a long groove formed in an axial direction of said core. 5. The stator core of a rotating electric machine according to claim 1, wherein the cylindrical portion is made of a magnetic material that becomes non-magnetic by heat treatment, and the high magnetic resistance portion is made by heat treatment. A stator core for a rotating electric machine having a formed nonmagnetic region. 6. The stator core of a rotating electric machine according to claim 1, wherein said cylindrical portion is formed of a soft magnetic plate spirally laminated in an axial direction of said core. Stator core of rotating electric machine.