JP2678015B2 - Electric motor stator core - Google Patents

Description

Description: 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 and the like.

2. Description of the Related Art Conventionally, a stator core of a motor of this type has generally been configured as shown in FIGS. That is, as a method for facilitating coil winding, the tooth core 110 has a plurality of teeth 112 arranged radially outward of a rotor hole 111 into which a rotor (not shown) is inserted. It is connected to the outer circumference of the rotor hole 111 by a bridging portion 113, and is adjacent to the tooth 112.
A slot 114 is formed between 112 and serves as a space around which a coil (not shown) is wound. Protrusions 115 projecting laterally are provided on the outer periphery of the teeth 112, and an opening 116 for winding a coil around the slot 114 is formed between the protrusions 115 and the adjacent protrusions 115. Reference numeral 117 denotes a ring-shaped yoke core, and a protrusion 118 is provided on the inner peripheral side of the yoke iron core 117. After the coil is wound around the slot 114 through the opening 116, the protrusion 118 is opened. It was press-fitted into the portion 116 and configured as a yoke stator.

In such a conventional configuration, the coil is wound around the tooth core.
Since the efficiency of the coil winding work is improved because it is performed from the outside of 110, the teeth 112 of the tooth core 110 and the teeth 112 are bridged to each other.
Since they are connected by 13, the magnetic flux generated by being excited by the coil flows from the tooth 112 to the rotor and generates torque, but a part of the generated magnetic flux is short-circuited through the bridging portion 113 of the tooth 112. It will not pass through the rotor. Since this short-circuited magnetic flux does not contribute to the generation of torque, it becomes an ineffective magnetic flux, and the exciting current for generating this magnetic flux becomes a loss, resulting in a problem of reducing the efficiency of the electric motor.

The present invention solves such a problem, and maintains the mechanical function as a connecting part that connects adjacent teeth and reduces the magnetic flux that short-circuits, thereby improving the efficiency of the electric motor. The purpose is to provide a child iron core.

Means for Solving the Problem In order to solve this problem, the first technical means of the present invention is a tooth core having a plurality of teeth radially provided on the outer periphery of a rotor hole, and a tooth core of the tooth core. A yoke portion core that is fitted to the outer peripheral portion to form a magnetic path, and the number of non-bridging portions provided on the inner peripheral edge portions of the teeth that are adjacent to each other is different.
The core plates of different types are superposed with the positions of the non-bridging parts shifted, and are laminated so as to sandwich a plurality of core plates having no bridging part.

A second technical means is a tooth core having a plurality of teeth radially provided on the outer circumference of a stator hole, and a yoke portion fitted to the outer circumference of the tooth core to form a magnetic path. An iron core, and the tooth cores are overlapped with each other by shifting the positions of the non-bridging portions to superimpose two types of iron core plates having different numbers of non-bridging portions provided on the inner peripheral edges of adjacent teeth Is sandwiched and laminated by an iron core plate having a bridge portion.

By the above technical means, the inner peripheral edge portion of the tooth core is determined while the position of the non-bridge portion is determined by one or a plurality of iron core plates having a number of non-bridge portions in the tooth core inner diameter more than the number of poles. By stacking so that at least one bridging portion of the iron core plate is disposed in the core, the tooth cores are integrated and the mechanical function is maintained.

Further, since the tooth core is composed of an iron core plate having a larger number of non-bridged portions than the number of poles on its inner peripheral edge, it is possible to eliminate the leakage magnetic flux that circulates the inner peripheral edge of the tooth core, and It is possible to improve the motor efficiency.

Then, in the first technical means, the iron core plates shown above are laminated until the tooth cores are integrated and maintain the mechanical function, and the other iron core plates having no bridging portion are laminated. As a result, the magnetic flux that circulates around the inner peripheral edge of the tooth core is eliminated, and the magnetic flux between adjacent teeth, that is, between adjacent poles, is greatly reduced to reduce the excitation current. Can be greatly reduced and the motor efficiency can be greatly improved.

Further, in the second technical means, the iron core plate shown above is used to maintain the mechanical function, and the iron core plate having the bridging portion is laminated on the inner peripheral edge of all the teeth to form the tooth core. Therefore, it is possible to reduce the leakage magnetic flux circulating around the inner peripheral portion of the tooth core to some extent, further improve the integral strength of the tooth core, and greatly improve the mechanical function.

Embodiments A first embodiment of the present invention will be described below with reference to FIGS.

1 to 3, a plurality of teeth 2 are radially arranged on the outer periphery of a rotor hole 1 into which a rotor (not shown) is inserted, and 6 are provided at inner peripheral edges of adjacent teeth 2. An iron core plate 4a having one non-bridged portion 3a and an iron core plate 4b having two non-bridged portions 3b at different positions from the non-bridged portion 3a of the iron core plate 4a are laminated by an arbitrary number. The tooth core 5 is formed. Adjacent teeth 2
Between the protrusions 7 is formed with a slot 6 which is a space around which a coil (not shown) is wound, and a protrusion 7 is provided on the outer periphery of the tooth portion 2. An opening 8 for winding is formed. Reference numeral 9 denotes an annular yoke core, which is provided with a convex portion 10 on the inner peripheral side of the yoke core 9 and is press-fitted into the opening 8. Then, after winding the coil around the slot 8 through the opening 8, the yoke core 9 is press-fitted to form a stator core.

And in FIG. 4, the A-phase coil 11 and the B-phase coil 12
It shows an example in which coils of a phase motor are arranged.

In the above configuration, current flows through the A-phase coil 11 and the iron core plate
The magnetic flux generated in 4a is magnetically separated from the adjacent pole by the non-bridged portion 3a, and the magnetic flux generated in the iron core plate 4b by the B-phase coil 12 is magnetically separated from the adjacent pole by the non-bridged portion 3b. Therefore, the short-circuited magnetic flux, that is, the leakage magnetic flux is greatly reduced.
That is, the leakage magnetic flux circulating around the inner peripheral edge of the tooth core 5 is greatly reduced by being blocked by the non-bridge portions 3a and 3b.

Further, the non-bridged portion 3a which is located at the inner peripheral edge of the slot 6 of the tooth core 5 and separates and divides the iron core plate 4a, and the non-bridged portion 3b which separates and divides the iron core plate 4b are the inner periphery of the tooth core 5 The parts are provided at different circumferential positions, that is, different slots 6.
Therefore, the bridging portion of the iron core plate 4a or the iron core plate 4b is always arranged at the inner peripheral edge of the tooth core 5 having a plurality of laminated iron core plates 4a and 4b, and the tooth core is It can be mechanically connected and integrally held, and leakage of magnetic flux can be greatly reduced.

As described above, according to the first embodiment, the tooth core 5 is provided with the iron core plate 4a having the six non-bridged parts 3a and the iron core plate 4a at a different position.
Since the iron core plates 4b having the individual non-bridge portions 3b are combined and laminated, the iron core plates 4a and 4b can be mechanically connected and held, and leakage of magnetic flux can be greatly reduced.

Next, a second embodiment of the present invention will be described with reference to FIG. The tooth core 5 of the second embodiment has a plurality of iron core plates 4a having three non-bridged portions 3a and two non-bridged portions.
It is composed of a plurality of iron core plates 4b having 3b, and the non-bridge portion 3a
And 3b are characterized in that they are laminated at different positions. By doing so, the iron core plates 4a and 4b can be connected and held, and the leakage of magnetic flux can be greatly reduced. The operation is the same as that of the first embodiment, and will be omitted.

Next, a third embodiment of the present invention will be described with reference to FIG. The tooth core 23 of the third embodiment has an iron core plate 21a having six non-bridged portions 20a, an iron core plate 21b having two non-bridged portions 20b, and an iron core plate 22 having no bridged portion 26. And the non-bridge portions 20a and 20b are displaced from each other and the core plate 21
It is characterized by a structure in which a and the iron core plate 21b are superposed and laminated so as to sandwich the iron core plate 22. With this configuration, the iron core plate 21a and the iron core plate 22 are connected and held, and leakage of magnetic flux can be significantly reduced. The operation is the same as that of the first embodiment and will not be described.

In the embodiment, a stator having two poles and eight slots and a short pitch winding is used, and the number of non-bridged portions of each iron core plate is 2, 3 or 6, but any number of poles slots is used. The number, the number of non-bridging portions, and the deviation of the positions of non-bridging portions may be used, and the invention can be applied to a full-pitch winding, and there is no difference in the action and effect.

Next, a fourth embodiment of the present invention will be described with reference to FIG. The tooth core 40 of the fourth embodiment has an iron core plate 42a having two non-bridged portions 41a and an iron core plate 42b having six non-bridged portions 41b, and all teeth are bridged portions. It is characterized in that it is composed of an iron core plate 44 having 43, the non-bridge portions 41a and 41b are displaced from each other, and the iron core plates 42a and 42b are superposed and sandwiched by the iron core plates 44 and laminated. With this configuration, the iron core plates 42a, 42b and the iron core plate 44 are connected and held, and leakage of magnetic flux can be significantly reduced. In addition,
The operation is the same as that of the first embodiment, and will be omitted.

In the above-mentioned embodiment, the stator having two poles and eight slots and the short pitch winding is used, but it is applicable to any number of poles, slots and full pitch winding.
There is no difference in its action and effect.

EFFECTS OF THE INVENTION As is clear from the above description of the embodiments, according to the present invention, two types of iron core plates having different numbers of non-bridge portions provided on the inner peripheral edge portions of adjacent tooth cores are provided. By stacking the bridges by shifting their positions, the mechanical function as a connecting part that connects adjacent teeth is maintained, the magnetic flux that short-circuits is significantly reduced, the exciting current is significantly reduced, and the The efficiency can be improved. Then, two kinds of iron core plates having different numbers of non-bridging portions provided in the inner peripheral edge portions of adjacent teeth are overlapped with each other by shifting the positions of the non-bridging portions to have no bridging portion. Since multiple iron core plates are laminated so as to sandwich them, non-bridged parts are formed in all laminated iron core plates, and the use of iron core plates that do not have bridging parts further reduces the exciting current. It is possible to obtain the effect that the mechanical function can be maintained while achieving the above.

In addition, two kinds of core plates with different numbers of non-bridging portions provided on the inner peripheral edges of adjacent tooth portions are overlapped with each other by shifting the positions of the non-bridging portions, and all teeth are bridged portions. Since it is sandwiched and laminated by iron core plates having, it is possible to reduce the magnetic flux that short-circuits, and it is possible to significantly increase the strength of the bridging portion as compared with the case where plate iron cores separated from each other are used. can get.

[Brief description of the drawings]

FIG. 1 is a plan view of a tooth portion of a stator core according to a first embodiment of the present invention, FIG. 2 is a development view of an inner peripheral side main portion of the tooth portion of the first embodiment, and FIG. FIG. 4 is a plan view of the yoke portion of the first embodiment, FIG. 4 is a development view of an inner peripheral side of a stator core wound with the coil of the first embodiment, and FIG. FIG. 6 is a development view of the inner circumference side of the stator core wound with the coil of the example, FIG. 6 is a development view of the inner circumference side of the stator core of the third embodiment in which the coil is wound, and FIG. FIG. 8 is a plan view of a tooth portion of a conventional stator core, and FIG. 9 is a plan view of the yoke portion of the conventional stator core. is there. 1 ... Rotor hole, 2 ... Tooth, 3,3a, 3b, 20a, 20b, 41a, 41b
…… Non-bridged parts, 4a, 4b, 21a, 21b, 22,42a, 42b, 44 …… Core plate, 5,23,40 …… Tooth core, 9 …… Yoke part core, 26,43…
… Bridge section

Claims (2)

(57) [Claims] 1. A tooth part core having a plurality of teeth radially provided on the outer periphery of a rotor hole, and a yoke part core fitted to the outer periphery of the tooth part core to form a magnetic path, A plurality of core plates having no bridging part, wherein two kinds of core plates having different numbers of non-bridging parts are provided at inner peripheral edge parts of adjacent teeth of the tooth part cores by shifting the positions of the non-bridging parts. A stator core of an electric motor that is constructed by stacking two core plates. 2. A tooth core having a plurality of teeth radially provided on the outer circumference of a stator hole, and a yoke core that is fitted to the outer circumference of the tooth core to form a magnetic path. The tooth cores are overlapped with each other by shifting two positions of the non-bridging portions of the core plates having different numbers of non-bridging portions provided at the inner peripheral edge portions of the adjacent teeth, and all the teeth have bridging portions. A stator core of an electric motor, which is formed by sandwiching and stacking the core plates.