JP2000166160A - Concentrated winding brushless dc motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a concentrated winding brushless DC motor in which reliability and productivity of the motor are improved. SOLUTION: A part of a stator core 11 is magnified, and attention is paid to a tooth part 12 which has a prescribed width. In the inner diameter side tooth part as far as an aperture part excepting the tooth part, tooth part tips 13 are formed stretching to both sides of the tooth part 12. A jig insertion hole 14 for lead line treatment is positioned on the outer periphery side in the central part of the tooth part of the stator core 11. A distance (H) between the tooth part 12 and a corner part of a slot bottom part is determined so as to be H>=T/2 with respect to an average tooth width dimension (T) of the tooth part 12. Thus the insertion hole 14 is bored and formed in the direction of a motor shaft. A repeat segment 3 is fixed by inserting a core press fitting part only in the hole 14.

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 is characterized by a structure of a motor stator 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 brushless DC motor of the concentrated winding type is shown in FIG.
6A, the stator has a shape as shown in FIG. 6A, and stator plates (silicon steel plates) are laminated to form a stator core 11. 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, a stator having four poles and six slots is shown.

[0005] This makes it possible to reduce the size of the stator of the brushless DC motor of the distributed winding type. The shape of the stator core 1 is as shown in the plan view of FIG. 7, and tooth tip portions 13 are formed on both sides of the tooth portion 12 so that the distance from the rotor is evenly spaced along the rotor surface. Is done.

The rotor 2 has a shape as shown in FIG. 6B, and a rotor core 21 is formed by laminating silicon steel plates. A magnet 22 is embedded in the rotor core 21. As the magnet 22 of the rotor 2, an ordinary ferrite magnet may be used. However, to reduce the size of the motor, a magnet having a large BH product, that is, a neodymium magnet made of neodymium, iron, or boron, or a samarium-cobalt magnet is used. That is, a so-called rare earth magnet or the like can be used.

[0007] A rotor 2 is inserted into the center of the stator 1 thus formed to constitute a concentrated winding type brushless DC motor. When processing the lead wire of the drive coil of such a concentrated winding type brushless DC motor,
The lead wire is fixed to a relay made of a resin molded product provided in the axial direction of the motor on the outer peripheral side of the coil end and formed integrally with the slot insulator.

This resin molded product relay is thickened in order to secure its strength, so that the amount of resin used increases, and the assembling work also requires much time. It was not optimal for use due to reliability issues.

[0009]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a concentrated winding type brushless DC motor which improves the reliability and productivity of the motor.

[0010]

According to a first aspect of the present invention, there is provided a concentrated winding type brushless DC motor, comprising: a stator core of a concentrated winding type motor; A jig insertion hole for a lead wire processing drilled in the axial direction of the motor such that the distance (H) from the corner portion of the above becomes H ≧ T / 2 with respect to the average tooth width dimension (T); Further, the lead wire of the drive coil is fixed to the relay inserted and fixed in the jig insertion hole.

In a concentrated winding type brushless DC motor according to a second aspect of the present invention, in the stator core of the concentrated winding type motor, the distance between the teeth and the corner of the slot bottom at the outer peripheral side of the center of the stator teeth. (H) has a lead wire processing jig insertion hole drilled in the axial direction of the motor such that H ≧ T / 2 with respect to the average tooth width dimension (T); and the jig insertion hole. The lead wire of the drive coil is fixed to the relay inserted and fixed to the connector, and the jig insertion hole and the relay are provided on an arbitrary number of stator teeth.

[0012] Thus, the stator of the brushless DC motor can be formed small. Also, a jig insertion hole for lead wire processing can be provided on the outer peripheral side of the center of the stator teeth of the stator core of the concentrated winding type motor without affecting the magnetic circuit, thereby improving the reliability and productivity of the motor. Improvement can be achieved.

In a concentrated winding type brushless DC motor according to a third aspect of the present invention, in the stator core of the concentrated winding type motor, the distance between the teeth and the corner of the slot bottom at the outer peripheral side of the center of the stator teeth. (H) has a lead wire processing jig insertion hole drilled in the axial direction of the motor such that H ≧ T / 2 with respect to the average tooth width dimension (T); and the jig insertion hole. It consists of a resin insulation jig inserted and fixed to the, the insertion shaft of the relay has a retaining mechanism in one direction,
The lead wire of the drive coil is fixed to a relay consisting of an annular lead wire fixing means having a cut at the top.

Thus, the stator of the brushless DC motor can be made small. Further, although the relay inserted into the jig insertion hole is made of a resin-made insulating material, the amount of resin used can be reduced. Accordingly, the assembling work is also simplified, and when the motor is used for a hermetic compressor motor, no oligomer is generated, and the reliability and productivity of the motor can be improved.

[0015]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram of a concentrated winding type brushless DC motor according to the present invention which solves the above-mentioned problems. 4 and 5 are state diagrams of the magnetic flux distribution of the stator and the rotor. As shown in FIG. 4, when the magnets 22 of the rotor are positioned with respect to the tooth portions 12 of the stator core, the magnets are in the middle of the magnets and are in a weak state. Paying attention to the magnetic path at that time, the position indicated by 14 has little influence on the magnetic flux path.

When the magnet 22 of the rotor is positioned with respect to the teeth 12 of the stator core as shown in FIG. 5, the magnet is in a state where the magnetism is strongest because the magnet is completely opposed.
Paying attention to the magnetic path at that time, the position indicated by 14 has no influence irrespective of the magnetic flux path.

Therefore, the position of 14 can be said to be an optimal position for providing a jig insertion hole for processing a lead wire formed in the axial direction of the motor while minimizing the influence on the magnetic path. Therefore, the present invention utilizes this phenomenon to position and drill a jig insertion hole for lead wire processing.

FIG. 1 is an enlarged view of a part of the stator core 11,
One tooth portion 12 is focused on, and the tooth portion 12 has a predetermined tooth width, and extends to both sides of the tooth portion 12 on the inner diameter side tooth portion up to the opening except the tooth portion. An end portion 13 is formed.

The position of the jig insertion hole 14 for lead wire processing is as follows.
Distance (H) from the center outer periphery of the teeth 12 of the stator core 11 to the teeth 12 and the corners of the bottom of the slot.
However, it is determined that H ≧ T / 2 with respect to the average tooth width dimension (T) of the tooth portion 12, and a jig insertion hole 14 for lead wire processing is formed by drilling in the axial direction of the motor. FIG. 2 is a plan view of the stator core 11 thus formed.

The relay 3 shown in FIG. 3 is inserted into the jig insertion hole 14 only at the core press-fitting portion and fixed.
Drive coil (not shown) using space in slot
Is wound directly, and a lead wire of a drive coil is fixed to the relay to form a stator core of a concentrated winding type brushless DC motor. The jig insertion hole 14 and the relay 3 need not be provided on all the teeth, but can be provided on any number of the stator teeth 12 as appropriate.

Next, FIG.
This will be described in detail with reference to FIG. 3A is a front view of the relay 3, FIG. 3B is a side view, and FIG. 3C is a bottom view. The relay 3 is made of an insulating material made of resin, and is inserted into the insertion shaft 31 of the relay 3 in a forward direction at the time of insertion.
In the pulling-out direction, there is provided a stopping means 33 in one direction, which acts as a stopper, and an annular lead wire fixing means 32 having a cut 34 in a part thereof is formed at the top of the relay 3. Then, the lead wire of the drive coil is pushed into the lead wire through hole from the cut 34 of the annular lead wire fixing means 32 and fixed.

[0022]

As described above, the present invention provides a brushless D
The stator of the C motor can be formed in a small size, and a jig insertion hole for lead wire processing is provided on the outer peripheral side of the center of the stator teeth of the stator core of the concentrated winding type motor without affecting the magnetic circuit. be able to. Further, although the relay inserted into the jig insertion hole is made of a resin-made insulating material, the amount of resin used can be reduced. Therefore, the assembling work is also simplified, and when the motor is used for a motor for a hermetic compressor, the reliability and productivity of the motor can be improved without generation of oligomers.

[Brief description of the drawings]

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

FIG. 2 is a front view, a side view, and a plan view of a relay.

FIG. 3 is a relationship diagram between a motor rotation angle and a torque.

FIG. 4 is a state diagram of a magnetic flux distribution of a stator and a rotor.

FIG. 5 is a state diagram of a magnetic flux distribution of a stator and a rotor.

FIG. 6 shows a stator and a rotor of a concentrated winding type brushless DC motor.

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

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Stator 11 Stator core 12 Tooth part 13 Tooth tip part 14 Jig insertion hole 2 Rotor 21 Rotor core 22 Magnet 3 Intermediate element 31 Intermediate element insertion axis 32 Lead wire fixing means 33 Detachment preventing means 34 Break

 ──────────────────────────────────────────────────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 Keihan Hon-dori Sanyo Electric Co., Ltd. F-term (reference) 5H002 AA01 AB01 AE08 5H019 AA07 CC03 DD01 EE01 EE14 5H604 AA05 BB01 BB14 BB17 CC01 CC05 CC15 QB12

Claims (3)

[Claims] 1. In a stator core of a concentrated winding type motor, the distance (H) from the center of the stator teeth to the corners of the slot bottoms is H ≧ H with respect to the average tooth width dimension (T). It has a jig insertion hole for lead wire processing drilled in the axial direction of the motor so as to be T / 2, and the lead wire of the drive coil is fixed to the relay inserted and fixed in the jig insertion hole. Concentrated brush type D characterized by the following:
C motor. 2. The brushless DC motor according to claim 1, wherein the jig insertion hole and the relay are provided on an arbitrary number of stator teeth. 3. The relay comprises a resin insulation jig,
2. The concentrated winding system according to claim 1, wherein the insertion shaft of the relay has a pull-out preventing means in one direction and an annular lead wire fixing means having a cut in a part at a top thereof. Brushless DC motor.