JPH10126984A - Stator iron core of motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the stator iron core of a motor, which can improve the efficiency of the motor, and also in which the stack strength of the ion core of the teeth is high, and stack accuracy such as the roundness of inside diameter, etc., can be achieved. SOLUTION: The stator iron core of a motor, which can improve the efficiency of the motor by so arranging the constitution as to decrease leaked magnetic fluxes by stacking first tooth iron core plates 5 provided each with one place of unbridged part 3 for magnetically separating a tooth 2 and a tooth 2 adjoining each other on the side of the inside periphery sheet by sheet or several sheets at a time, with the positions of the unbridged parts 3 changed, thereby magnetically separating the magnetic fluxes generated in the first tooth iron core plates 5 from the next poles by the unbridged parts 3, and also in which the stack strength of the teeth iron core is high and stack accuracy such as the roundness of inside diameter, etc., can be achieved, can be obtained.

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 an electric motor used for driving a fan of home electric appliances.

[0002]

2. Description of the Related Art Conventionally, the stator core of this type of motor has been
Generally, the configuration was as shown in FIGS. That is, as a method for facilitating coil winding, the tooth core 110 includes a plurality of teeth 112 radially arranged outside a rotor hole 111 in which a rotor (not shown) enters.
Reference numeral 12 denotes a bridging portion 113 which is connected to the outer periphery of the rotor hole 111, and forms a slot 114 between the teeth 112 which serves as a space around which a coil (not shown) is wound.

Further, a projection 115 is provided on the outer periphery of the tooth 112, and an opening 116 for winding a coil around the slot 114 is formed between the projection 115 and the projection 115, and an annular yoke section iron core 117 is formed. Protrusions 118 are provided on the inner peripheral side to form openings 116.
Press fit.

After the coil is wound around the slot 114 through the opening 116, the yoke core 117 is press-fitted to form a stator.

[0005]

In such a structure of the conventional stator core of the electric motor, the efficiency of the coil winding operation is improved because the coil is wound from the outside. Since the teeth 112 and the teeth 112 are connected by the bridging part 113, the magnetic flux generated by excitation by the coil flows from the teeth 112 to the rotor, and generates torque.
A part of the generated magnetic flux is short-circuited through the bridging portion 113 of the tooth 112 and does not pass through the rotor. This short-circuited magnetic flux does not contribute to the generation of torque, so that it becomes an invalid magnetic flux.Excitation current for generating this magnetic flux is lost, which reduces the efficiency of the motor and causes noise and vibration. Is required to be improved.

The present invention solves such a conventional problem, and can improve the efficiency of an electric motor, and also has a high lamination strength of a tooth core, and can easily provide lamination accuracy such as roundness of an inner diameter. An object of the present invention is to provide a stator core for an electric motor.

[0007]

SUMMARY OF THE INVENTION In order to achieve the above object, a stator core of a motor according to the present invention has a toothed core having a plurality of teeth and a yoke core. In the iron core, one or more first tooth core plates each having one non-bridging portion for magnetically separating teeth adjacent to each other on the inner peripheral side of the tooth core are provided. It is obtained by changing the position of the entangled portion and stacking.

According to the present invention, it is possible to improve the efficiency of the motor, to obtain a stator core of the motor in which the lamination strength of the tooth core is high and the lamination accuracy such as the inner roundness is easily obtained. .

[0009]

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a toothed iron core having a slot having an opening for winding a coil on an outer peripheral edge of a plurality of teeth radially provided on the outer circumference of a rotor hole, and a toothed core. In the stator core in a motor having two or more phases and four or more phases and poles, the stator core is divided into a two-phase four-pole or more and a yoke core forming a magnetic path after the coil is wound around the iron core. The position of the non-bridging portion is changed by one or more first toothed core plates each having one non-bridging portion for magnetically separating teeth adjacent to each other on the inner peripheral side of the iron core. The tooth core is laminated with the first tooth core plate having a non-bridging portion in one place, so that the magnetic flux leakage of the tooth core is effectively reduced, and the motor efficiency is reduced. And it is harder to deform as compared to the case where the non-bridging part of the tooth core plate is provided at multiple locations, Is lifting, also has the effect of strength after lamination also increases.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[0011]

【Example】

(Embodiment 1) As shown in FIGS. 1 to 3, teeth 2 radially extend outward on the outer periphery of a rotor hole 1 in which a rotor (not shown) enters.
Is provided at an integer multiple of the number of poles, and one non-bridging portion 3 for magnetically separating the teeth 2 from each other is provided at the inner peripheral edge of the adjacent teeth 2,
The first tooth core plate 5 having the connection cut by the bridging part 4 is
The toothed iron core 6 is formed by changing the position of the non-bridging portion 3 one by one or a plurality of pieces and laminating them.

A slot 7 is formed between adjacent teeth 2 as a space around which a coil (not shown) is wound.
A protrusion 8 is provided on the outer periphery of the tooth portion 2, and an opening 9 for winding a coil around the slot 7 is formed between the protrusions 8. Further, the annular yoke core 10 is provided on the inner peripheral side with a convex portion 11 that fits into the opening 9 provided in the tooth core 6.

After winding a coil around the slot 7 from the opening 9 of the tooth core 6, the protrusion 11 of the yoke core 10 is wound.
Is press-fitted into the opening 9 of the tooth core 6 and the yoke core 10 is connected to the tooth core 6 to form a stator core.

FIG. 3 is a developed view of the stator core on which the coil is wound, as viewed from the inner peripheral side.
This shows an example in which coils of a two-phase motor are arranged with the phase coils 13.

In the above configuration, when a current flows through the A-phase coil 12, the magnetic flux generated in the first tooth core plate 5 is magnetically separated from the adjacent pole by the non-bridging portion 3, and the B-phase coil 13, the magnetic flux generated in the first tooth core plate 5 is also magnetically separated from the adjacent pole by the non-bridging portion 3, and the magnetic flux short-circuited;
That is, the leakage flux can be reduced.

Further, the tooth core 6 is formed by laminating a first tooth core plate 5 having one non-bridging portion 3 at different positions of the non-bridging portion 3, thereby forming the first tooth core. The non-bridging portion 3 of the plate 5 is such that the bridging portion 4 of the next first toothed iron core plate 5 overlaps every one or more sheets, and the laminated first toothed iron core plate 5 is solid. Since the first toothed core plate 5 has the non-bridge portion 3 only at one place, the deformation of the first toothed core plate 5 is small, and the inner diameter roundness is small. Is held, the lamination strength of the tooth core 6 is high,
The lamination accuracy is easily obtained.

(Embodiment 2) As shown in FIG. 4, one non-bridging portion 3 is provided and the first tooth core plate 5 cut off by the bridging portion 4 is moved to the position of the non-bridging portion 3. Change and stack multiple sheets,
A large number of second tooth core plates 14 having no bridging part 4 are sandwiched between the stacked first tooth core plates 5, and the tooth cores 6 are stacked.
A is formed, and a four-pole A-phase coil 12 and a four-pole B-phase coil 13 are used to arrange a two-phase motor coil to form a stator.

In the above configuration, when a current flows through the A-phase coil 12, the magnetic flux generated in the first tooth core plate 5 having the bridging portion 4 is connected to the adjacent pole by the non-bridging portion 3 provided at one place. The magnetic flux generated in the first tooth core plate 5 by the B-phase coil 13 is also magnetically separated from the adjacent pole by the non-bridging portion 3, and the A-phase coil 12 and the B-phase coil 13 When the current flows, the magnetic flux generated in the second tooth core plate 14 having no bridging part 4 is also completely magnetically separated from the adjacent pole by the second tooth core plate 14. That is, the leakage magnetic flux can be significantly reduced as compared with the case where only the first toothed iron core plates 5 are stacked.

The toothed iron core 6A is formed by laminating a plurality of first toothed iron core plates 5 each having the non-bridging portion 3 at one position while changing the position of the non-bridging portion 3. Since the bridging portion 4 is superimposed on 3, the stacked first tooth core plates 5 are firmly connected to each other with the second tooth core plate 14 having no bridging portion 4 sandwiched therebetween. The strength of the tooth core 6A can be maintained.

(Embodiment 3) As shown in FIG. 5, one non-bridging portion 3 is provided at a break between each pole generated by the winding (eight places in the case of two-phase four-pole), and the bridging portion 4 is provided. The first tooth core plates 5 necessary to form the tooth core 6B are stacked so that the positions of the non-bridge portions 3 of the first tooth core plates 5 that have been cut off by the communication are arranged. The first tooth core plate 5 in which the total number is equally divided by the number of cuts in each pole, and the equal number of sheets are stacked
Are laminated so that the positions of the non-bridge portions 3 are sequentially changed so as to correspond to the cuts of the respective poles to form the tooth core 6B, and the A-phase coil having four poles and the B-phase coil 13 having four poles form two. The stator in which the coils of the phase motor are arranged is configured.

In the above configuration, when a current flows through the A-phase coil 12, the magnetic flux generated in the first tooth core plate 5 is magnetically separated from the adjacent pole by the non-bridging portion 3. As a result, the magnetic flux generated in the first tooth core plate 5 is also magnetically separated from the adjacent poles by the non-bridging portion 3, so that the short-circuited magnetic flux, that is, the leakage magnetic flux can be reduced and the first tooth core plate laminated is provided. Since all the sheets No. 5 are equally divided by the number of cuts in each pole and laminated while changing the position of the non-bridging part, the magnetic separation of each pole is equal to that of the adjacent pole, It is possible to eliminate the occurrence of the balance state.

Further, the tooth core 6B has one non-bridging portion 3 in one place.
Since the total number of the first tooth core plates 5 provided with the cores is divided into equal parts and the positions of the non-bridging parts are changed and stacked, the tooth cores can be firmly stacked. Become.

(Embodiment 4) As shown in FIG. 6, the third toothed iron core plate 15 having the non-bridging portions 3 provided at every other location in half of the total slot is placed at the position of the non-bridging portions 3. A plurality of second tooth core plates 14 having no bridging part are sandwiched and stacked by the stacked third tooth core plates 15 to form a tooth core 6C. The pole A-phase coil 12 and the four-pole B-phase coil 13 constitute a stator in which coils of a two-phase motor are arranged.

In the above configuration, when a current flows through the A-phase coil 12, the magnetic flux generated in the third tooth core plate 15 is provided with the non-bridging portion 3 in one half of all the slots.
The magnetic flux generated in the third tooth core plate 15 by the B-phase coil 13 is magnetically separated from the adjacent pole, and the current is applied to the A-phase coil 12 and the B-phase coil 13 by the B-phase coil 13. The magnetic flux generated in the second tooth core plate 14 having no flow bridging portion is also completely magnetically separated from the adjacent pole, so that short-circuited magnetic flux, that is, leakage magnetic flux is not generated at all, and the efficiency is reduced. It is greatly improved and the generation of electromagnetic noise can be prevented.

[0025]

As is clear from the above embodiment, according to the present invention, the first toothed core plate provided with only one non-bridging portion is used, so that a plurality of non-bridging portions can be formed. Providing a stator core for an electric motor that has higher lamination strength, is easier to achieve lamination accuracy such as inner diameter roundness, and has less leakage magnetic flux and improved motor efficiency as compared to the one provided. it can.

Further, the first non-bridging portion is provided only in one place.
The use of the second tooth core plate having no toothed iron core plate and no bridging portion greatly reduces the occurrence of leakage magnetic flux as compared to the case where only the first tooth iron core plate is used. Can be.

Further, since the non-bridging portion of the first toothed iron core plate, which is obtained by equally dividing the total number of sheets to be stacked as the toothed iron core at the cut of each pole generated by the winding, is arranged and stacked, each electrode is laminated. In both cases, the magnetic separation from the adjacent poles is equivalent, so that the occurrence of a magnetic unbalance state can be eliminated.

Further, since the third tooth core plate provided with the non-bridging portion every other place at half of all the slots and the second tooth core plate having no bridging portion are used, In principle, no magnetic leakage occurs between adjacent poles, so that efficiency can be improved and generation of electromagnetic noise can be prevented.

[Brief description of the drawings]

FIG. 1 is a plan view of a tooth core of a stator core according to a first embodiment of the present invention.

FIG. 2 is a plan view of a yoke core of the stator core.

FIG. 3 is an exploded view of the stator iron core with a coil wound thereon as viewed from the inner peripheral side.

FIG. 4 is a developed view of a stator core according to a second embodiment of the present invention, in which a coil is wound around a stator core, as viewed from an inner circumferential side;

FIG. 5 is a development view of the stator core according to the third embodiment of the present invention, in which a coil is wound around the stator core as viewed from the inner peripheral side.

FIG. 6 is a developed view of a stator core according to a fourth embodiment of the present invention, in which a coil is wound around the stator core as viewed from the inner peripheral side.

FIG. 7 is a plan view of a tooth core of a conventional stator core.

FIG. 8 is a plan view of a yoke core of the stator core.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Rotor hole 2 Teeth 3 Non-bridge part 4 Bridge part 5 First teeth core plate 6 Teeth core 6A-6C Teeth core 7 Slot 10 Yoke core 12 A-phase coil 13 B-phase coil 14 Second tooth core plate 15 Third tooth core plate

Claims (4)

[Claims] 1. A tooth core having a slot having an opening for coil winding on an outer peripheral edge of a plurality of teeth provided on an outer periphery of a rotor hole, and a tooth core having an outer periphery after coil winding on the tooth core. In a stator core of a motor having two phases and four or more phases and poles of a type divided into a yoke core forming a magnetic path and being fitted, the tooth cores are adjacent to each other on the inner peripheral side. Core of an electric motor in which one or more first toothed core plates provided with one non-bridging portion for magnetically dividing the teeth to be formed and one or more non-bridging portions are laminated by changing the position of the non-bridging portion . 2. A plurality of first toothed iron core plates provided with one non-bridging portion are laminated by changing the position of the non-bridging portion, and the first toothed iron core plates laminated are completely bridged. The stator core for an electric motor according to claim 1, wherein a plurality of second tooth core plates having no teeth are sandwiched and laminated. 3. The method according to claim 1, further comprising the steps of:
The total number of the first tooth core plates forming the tooth cores is equally divided by the number of the cuts of the respective poles so that the non-bridge portion of the tooth core plate is located, 2. The stator core of an electric motor according to claim 1, wherein the non-bridging portions are stacked at different positions for each tooth core plate. 4. A non-bridging portion having one slot in every other slot
/ 2, a plurality of third toothed iron core plates are stacked at different positions of the non-bridging portions, and the stacked third toothed iron core plates have no second bridging portion. 2. The stator core for an electric motor according to claim 1, wherein a number of core plates are sandwiched and laminated.