JP2000166155A - Concentrated winding brushless dc motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a concentrated winding brushless motor in which lead wire connection parts and neutral point of a drive coil are arranged effectively. SOLUTION: A part of a stator core is magnified. A tooth part 12 is formed in the stator core, and has a specified tooth width. On both sides of the tooth part, tooth part tip parts 13 are formed along the surface of a rotor. Slot insulating paper 5 is arranged on an inner edge of a slot part. A drive coil 3 is wound around the tooth part directly, by using a space in the slot part. For the winding work of the drive coil, the drive coil 3 is held by the tip of a nozzle for winding and wound around the tooth part 12 by the needle action of the nozzle. A space secured for the needle action of the of the nozzle is formed between neighboring drive coils. In the space, hollow connection insulating paper 6 is arranged, in which a lead wire connecting part 4 of the drive coil and a neutral point are embedded and arranged. Thereby a concentrated wound type brushless motor whose coil volume is reduced is constituted.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a concentrated winding type brushless DC motor which has a feature in a connection portion of a lead wire of a stator of a motor and is suitable for use as a drive motor of a hermetic compressor.

[0002]

2. Description of the Related Art Recently, with the spread of air conditioners such as air conditioners, it has been required to reduce the size in terms of shape, but to increase energy efficiency in order to save power. It is desired that the driving motor used in the vehicle be reduced in size and increased in efficiency.

Conventionally, a brushless DC motor of a distributed winding type is generally used as a drive motor for a hermetic compressor. However, the applicant of the present invention has concentrated winding to simplify the manufacturing process, reduce the size and increase the efficiency. A brushless DC motor of the type was proposed.

A concentrated winding type brushless DC motor is shown in FIG.
As shown in FIG. 2, the stator is constituted by a stator 1 and a rotor 2, and the stator has a shape as shown in FIG. 2A, and a stator core 11 is formed by laminating stator plates (silicon steel plates). The stator core 11 is provided with a tooth portion 12, and the tooth portion 12 has a predetermined tooth width, and tooth end portions 13 are provided on both sides thereof along the surface of the rotor. A drive coil (not shown) is directly wound around the tooth portion 12 using the space of the slot portion, and a magnetic pole of the stator 1 is formed by a so-called concentrated series winding method. In this example, the stator has four poles and six slots, and a plan view of the stator core 11 is shown in FIG.

The rotor 2 has a shape as shown in FIG. 2B, and a rotor core 21 is formed by laminating silicon steel plates. A permanent magnet 22 is embedded in the rotor core 21. As the permanent magnet 22 of the rotor 2, an ordinary ferrite-based magnet may be used.
A so-called rare earth magnet such as a magnet having a large product, that is, a neodymium magnet made of neodymium, iron, or boron, or a samarium-cobalt-based magnet can be used.

[0006] The rotor 2 is inserted into the center of the stator 1 formed as described above to form a concentrated winding type brushless DC motor, so that the stator is formed smaller than a distributed winding type brushless DC motor stator. be able to.
When the drive coil is directly wound around the tooth portion 12 of the stator core 11 by utilizing the space of the slot portion to form the magnetic poles of the stator 1 by the concentrated series winding method, the concentrated winding motor uses a connecting portion for each slot from its mechanism. Therefore, the treatment is difficult, and the connection part is fixed by being integrated with the core insulator formed by resin molding, or is arranged on the coil end.

However, in this method, since the total amount of resin is increased by performing resin molding, oligomers increase in a compressor using a refrigerant and accumulate in pipes and the like, resulting in poor cooling and the like. In addition, when the motor is arranged on the coil end, unlike the motor of the distributed winding system, it is unstable due to the winding arrangement and is hard to fix.

[0008]

SUMMARY OF THE INVENTION Accordingly, the present invention provides a concentrated winding type brushless DC motor in which a lead wire connecting portion of a driving coil and a neutral point are efficiently arranged when forming a magnetic pole of a stator. The purpose is to:

[0009]

According to a first aspect of the present invention, there is provided a brushless DC motor of a concentrated winding type, wherein a lead wire of a driving coil is utilized in a stator of a concentrated winding type motor by utilizing a space in a slot portion of a stator core. The connection portion and the neutral point were buried in the slot.

According to a second aspect of the present invention, there is provided a brushless DC motor of a concentrated winding type for needle operation of a winding nozzle when a driving coil is wound around a slot of a stator core in a stator of a concentrated winding type motor. The lead wire connection part and the neutral point of the drive coil are buried in the slot by utilizing the space secured in (1).

Thus, when forming the magnetic poles of the stator, the connecting portions are fixed by being integrated with the core insulator formed by resin molding, or the lead wire connecting portions of the drive coil and the connecting portions are not disposed on the coil ends. A brushless DC motor of a concentrated winding type in which a neutral point is buried in a slot and efficiently arranged can be realized.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a concentrated winding type brushless DC motor according to the present invention will be described with reference to FIG. FIG. 1 is an enlarged view of a part of a stator core 11 of the stator shown in FIG. 2 (A). The stator core 11 is provided with a tooth portion 12, and the tooth portion 12 has a predetermined tooth width and has a A tooth tip 13 is provided along the surface of the rotor. A slot insulating paper 5 is arranged on the inner edge of the slot, and the drive coil 3 is directly wound around the tooth 12 using the space of the slot.

In the winding operation of the driving coil, the driving coil 3 is held at the tip of the winding nozzle, and is wound around the tooth portion 12 by the needle operation of the nozzle. At this time, a space reserved for the needle operation of the winding nozzle is formed between the adjacent drive coils, and the hollow connection portion insulating paper 6 is arranged in this space, and the lead of the drive coil is inserted therein. The wire connection part 4 and the neutral point are buried and arranged.

Similarly, for all the magnetic poles, the lead wire connection portion and the neutral point of the drive coil are buried and arranged in the slot by utilizing the space of the slot portion of the stator core.
Concentrated winding brushless D with reduced coil volume
Constructs the stator of the C motor.

[0015]

As described above, the present invention provides a brushless D
The stator of the C motor can be formed in a small size, and at the time of forming the magnetic poles of the stator, the connection portion is fixed by integrating with a core insulator formed by resin as in the related art, or is arranged on the coil end. Using the space reserved for needle operation of the winding nozzle when winding the drive coil without using it, the lead wire connection part and neutral point of the drive coil are buried in the slot and placed efficiently As a result, it is possible to realize a brushless DC motor of the concentrated winding type capable of reducing the coil volume.

[Brief description of the drawings]

FIG. 1 is a partially enlarged view of a stator core of the present invention.

FIG. 2 shows a concentrated winding type brushless DC motor stator and rotor.

FIG. 3 is a plan view of a stator core.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Stator 11 Stator core 12 Tooth part 13 Tooth tip part 2 Rotor 21 Rotor core 22 Magnet 3 Drive coil 4 Lead wire connection part 5 Slot insulating paper 6 Connection insulating paper

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Masaaki Takezawa 2-5-5 Keihanhondori, Moriguchi-shi, Osaka Sanyo Electric Co., Ltd. (72) Inventor Toshito Yanashima 2 Keihanhondori, Moriguchi-shi, Osaka 5-5-5 Sanyo Electric Co., Ltd. (72) Inventor Keishiro Igarashi 2-5-5 Keihan Hondori, Moriguchi-shi, Osaka Pref. Sanyo Electric Co., Ltd. (72) Inventor Shigemi Koiso, Moriguchi-shi, Osaka 2-5-5, Keihanhondori Sanyo Electric Co., Ltd. F-term (reference) 5H019 AA07 CC03 DD01 5H604 AA05 AA08 BB01 BB14 BB17 CC01 CC05 CC16 DB26 PB03 QB12 QB15

Claims (2)

[Claims] In a concentrated winding type motor stator, a lead wire connecting portion and a neutral point of a drive coil are buried in a slot by utilizing a space of a slot portion of a stator core. Brushless DC motor. 2. A lead wire connecting portion of a driving coil in a stator of a concentrated winding motor using a space secured for a needle operation of a winding nozzle when winding a driving coil around a slot portion of a stator core. And a concentrated winding type brushless DC motor, wherein a neutral point is embedded in a slot.