JP2001112198A - Motor-driven blower - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a motor-driven blower which increases air cooling effect, in which an electrical winding resistance is reduced, in which a copper wire is wound easily on a magnetic-pole core, and whose operating efficiency is high by improving the shape of a yoke core constituting a stator. SOLUTION: This motor-driven blower is composed of a fan part 2 and a motor part 9, and the stator 6 of the motor part 9 is fixed to the inner side of a bracket 5, whose cross section is circular. The stator 6 is constituted of a pair of opposite magnetic pole cross 14 which comprise exciting windings A, and the stator is constituted of a pair of arcuate yoke cores 18, both ends of which are connected respectively to both ends of the magnetic pole cores 14.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric blower provided with a motor having a stator formed of a plurality of divided members.

[0002]

2. Description of the Related Art FIGS. 6 and 7 are a longitudinal sectional view and a sectional view showing a main part of a conventional electric blower disclosed in Japanese Patent Application Laid-Open No. 8-317579. 6 and 7, reference numeral 100 denotes an electric blower, which includes a fan unit 102 for housing a fan 101;
A motor section 106 for rotating the fan 101 at a high speed is provided. A stator 103 of the motor section 106 is press-fitted and fixed to a bracket 104 and a rotor 105.
Are rotatably supported by the bracket 104. 1
Reference numeral 07 denotes a bearing for supporting the shaft 108 of the rotor 105 from both ends, and reference numeral 109 denotes a motor provided between the fan unit 102 and the motor unit 106 so that the high-speed airflow from the fan 101 can be smoothly motored. A guide vane for guiding to the unit 106.

Next, a stator 10 is attached to the bracket 104.
3 and the rotor 105 will be described. 110 is an exciting winding A made of a copper wire having a small diameter in the center.
Is a magnetic pole member having a magnetic pole 111 wound around the magnetic pole 111 and arm portions 112 extending to the left and right of the magnetic pole 111. A predetermined number of the magnetic pole members 110 are laminated and fixed to form a magnetic pole core-113. The cores 113 are press-fitted and fixed to the bracket 104 so as to face each other. 114 is each magnetic pole core-11
An engagement projection formed inside the third arm 112.

Reference numeral 115 denotes a corner 116 bent inward at both ends.
And a substantially U-shaped yoke member having an engagement concave portion 117 at the outer end of the corner portion 116 to engage with the engagement convex portion 114. A predetermined number of the yoke members 115 are laminated and fixed. Thus, a pair of yoke cores-118 is formed. As shown in FIG. 7, both ends of the yoke core-118 and the magnetic pole core-113 are connected, and the engagement projection 114 and the engagement recess 117 are engaged.
The stator 103 is assembled. Stator-10
3 is press-fitted and fixed inside the bracket 104.

A rotor member 119 is disposed between the magnetic poles 111 of the magnetic member 110 facing each other. The rotor member 105 is formed by lamination and fixed, and a winding (not shown) is formed on the outer periphery. It is made to wind. 120 is magnetic pole 1
It is a winding space formed between 11 and the yoke core-118 and winding the winding A. 121 is an arc-shaped outer air passage formed between the bracket 104 and the yoke core-118, 122
Is an inside air passage formed between the yoke core-118 and the rotor 105.

In such a conventional electric blower 100, after a predetermined number of exciting windings A are wound around the magnetic pole 111, the magnetic pole core-113 and the yoke core-118 are connected and press-fitted and fixed to the bracket 104. In addition, the efficiency of winding the exciting winding A around the magnetic pole 111 can be significantly improved.

[0007]

SUMMARY OF THE INVENTION Generally, motor 10
The performance of No. 6 depends on the magnitude of the product of the current and the number of turns of the exciting winding A and the electric resistance loss of the exciting winding A. That is, in the conventional electric blower as described above, there is no design intention to form a large winding space 120 formed between the magnetic pole 111 and the yoke core-118, and an exciting winding having a small resistance and a large diameter is used. A had to be wound, resulting in poor heat generation efficiency. In addition, the outside air from the fan 101 is distributed to the inner air passage 122 and the outer air passage 121, and the exciting winding A having the highest temperature and the winding (not shown) wound around the rotor 105 are sufficient. There was a problem that air cooling was not possible.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems. By improving the shape of the yoke core constituting the stator, the air-cooling effect is enhanced, and the electrical resistance of the winding is reduced. Still another object of the present invention is to provide an electric blower having a high work efficiency, in which a copper wire is easily wound around a magnetic pole core.

[0009]

The electric blower according to the present invention comprises a fan section and a motor section.
A stator having a stator section, which is fixed inside a bracket having a circular cross section, wherein the stator has a pair of magnetic pole cores having exciting windings and opposite ends of the magnetic pole cores; And a pair of arc-shaped yoke cores each having both ends connected to the portion.

[0010] Further, a clearance for ventilation between the outer surface of the yoke core and the bracket is smaller than the inner space between the rotor of the motor portion and the yoke core. Is formed.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 1 to 3 show a first embodiment of the present invention. FIG. 1 is a longitudinal sectional view of an electric blower, FIG. 2 is a transverse sectional view of a bracket portion, and FIG. 3 is a magnetic pole core forming a stator. It is an exploded perspective view of a yoke core. In the figure, reference numeral 1 denotes an electric blower, a fan unit 4 comprising a fan 2 and a guide blade 3 for moving a high-speed rotating airflow from the fan 2 to a motor unit 9 described later, and an exhaust port 5A.
And a motor portion 9 comprising a rotor 6 press-fitted and fixed inside a substantially cylindrical bracket 5 having a rotor and a rotor 8 rotatably supported at both ends by bearings 7. ing.

Numeral 14 denotes a magnetic pole 10 having an inner surface formed in a substantially semicircular shape, an arm 11 extending linearly to the left and right from the magnetic pole 10, and an engaging projection 12 provided inside the arm 11. A magnetic pole core formed by laminating and fixing the magnetic pole members 13 formed as described above. Reference numeral 18 denotes an arc-shaped yoke member 17 having an engagement concave portion 16 at each of both end portions 15 for engaging with the engagement convex portion 12, and an inner surface of the bracket 5 and an outer surface thereof having substantially the same diameter.
Are laminated and fixed to form a yoke core. The stator 6 includes a pair of magnetic pole cores 14 which are arranged so as to face each other in advance.
Are formed by connecting a pair of yoke cores 18 so as to face each other. A is magnetic pole core-14
An exciting winding made of a copper wire wound around the magnetic pole 10 by a predetermined number before connecting the yoke core 18 to the magnetic pole 10, and 19 is a winding space formed between the magnetic pole 10 and the yoke core 18. It is.

The rotor 8 is disposed between the magnetic poles 10 and has a number of U-shaped grooves 20 on its outer periphery. The U-shaped grooves 20 are provided with a winding B made of a copper wire. Reference numeral 21 is an arc-shaped inner space formed between the rotor 8 and the yoke core 18.

At the time of assembling the electric blower 1 constructed as described above, first, the exciting winding A is wound around the magnetic pole 10 of the magnetic pole core 14. At this time, since the yoke core 18 is previously formed in an arc shape, the winding space 18 can be widely secured, so that a relatively large-diameter copper wire having a small electric resistance can be used. Next, the engaging concave portions 17 of the yoke core 18 are respectively engaged and fixed to the engaging convex portions 12 at both ends of the magnetic pole core 14 arranged opposite to each other, and the stator 6 is mounted. Form. Then, the stator 6 is directly press-fitted and fixed inside the bracket 5 using a jig.

Thereafter, various parts are assembled, and the motor unit 9 and the fan unit 2 are connected to complete the assembly of the electric blower 1. As a result, when the motor section 9 is energized, the outside air passes through the fan section 4 by the fan 2 rotating at a high speed, and flows into the motor section 9 through the guide vanes 3. At this time, since most of the outside air passes through the inner space 21 between the rotor 8 and the yoke core 18, the exciting winding A and the winding B, which have been heated to a high temperature, are surely cooled and exhausted. It is discharged from the mouth 5A. In addition, since the yoke core 18 is in contact with the inside of the bracket 5, the bracket 5 can be used as a magnetic path, so that the effective magnetic path width is widened and iron loss is improved. That is, it becomes a high-efficiency electric blower.

Embodiment 2 FIG. 4 shows a second embodiment of the present invention, and is a cross-sectional view of a motor unit 9.
In the figure, the same components as those of the first embodiment are denoted by the same reference numerals,
Description is omitted. In the drawing, reference numeral 18A denotes an arc-shaped yoke core having an outer surface located slightly inward of the bracket 5A, and a ventilation gap 22 between the bracket 5A and the bracket 5A.
Is formed. The area ratio of the ventilation gap 22 is sufficiently smaller than that of the inner space 21. Numeral 23 denotes a projection formed on the inner side surface of the bracket 5A for securely securing a guide and ventilation gap 22 when the stator 6A is press-fitted and fixed to the bracket 5A. In such a configuration, the outside air from the fan 2 enters the motor portion 9 and passes through the ventilation space 22 as well as the inner space 21 of the bracket 5A. As a result, the entire periphery of the bracket 5A is reliably cooled. The projection 23 may be provided on the yoke core-18A side.

Embodiment 3 FIG. 5 shows a third embodiment of the present invention, and is a cross-sectional view of a motor unit 9.
In the figure, the same components as those of the first embodiment are denoted by the same reference numerals,
Description is omitted. In the drawing, reference numeral 18B denotes a yoke core in which a part of the outer surface facing the bracket 5 is cut out so that a flat surface 24 is formed, and further, bent portions 25 are formed at both ends. Reference numeral 22A denotes a ventilation gap formed between the flat surface 24 and the bracket 5, and the opening area thereof is sufficiently smaller than the inner space 21. Due to such a configuration, the outer peripheral portion of the yoke core -18B is reliably cooled by the outside air passing through the ventilation gap 22A.

[0018]

Since the present invention is configured as described above, it has the following effects.

By dividing the stator into a magnetic pole member and a yoke member formed in an arc shape substantially the same as the inner diameter of the bracket, the winding operation of the exciting winding can be facilitated and the winding can be facilitated. Since a large space can be secured, a large-diameter copper wire with low electrical resistance can be used, achieving high efficiency.Also, most of the outside air flows into the arc-shaped inner space, so that the flow of outside air is smooth. And the exciting winding A and the winding B, which have been heated to a high temperature, can be reliably cooled. Further, since the outer periphery of the yoke core is formed to have the same shape as the inner diameter of the bracket, the yoke core serves as an insertion guide for the bracket, so that the stator can be easily press-fitted and fixed, and the bracket can be connected to the magnetic path. It is possible to improve iron loss.

Further, a yoke core constituting a stator is provided.
By providing a ventilation gap having a smaller opening area than the inner space between the bracket and the bracket, the air cooling of the stator can be reliably performed.

[0021]

[Brief description of the drawings]

FIG. 1 is a vertical sectional view of an electric blower according to Embodiment 1 of the present invention.

FIG. 2 is a cross-sectional view of the electric blower showing the first embodiment of the present invention.

FIG. 3 is an exploded perspective view of a main part showing the first embodiment of the present invention.

FIG. 4 is a partially cutaway cross-sectional view of an electric blower according to a second embodiment of the present invention.

FIG. 5 is a partially cutaway cross-sectional view of an electric blower showing a third embodiment of the present invention.

FIG. 6 is a longitudinal sectional view showing a conventional electric blower.

FIG. 7 is a cross-sectional view of the electric blower in FIG.

[Explanation of symbols]

4 Fan part, 5 bracket, 6 stator, 8
Rotor, 9 motor parts, 10 magnetic poles, 13 magnetic pole members, 14 magnetic pole cores, 17 yoke members, 18 yoke cores, 19 winding spaces, 21 inner spaces, 22 ventilation gaps, 23 Protrusion, A winding.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification code FI Theme coat ゛ (Reference) H02K 1/14 H02K 1/14 A 5H607 1/20 1/20 A 5/04 5/04 7/14 7 / 14 A (72) Inventor Yuji Takahashi 1728-1, Komaeda, Hanazono-cho, Osato-gun, Saitama Prefecture Inside Mitsubishi Electric Home Equipment Co., Ltd. In-house F-term (reference) 3H022 AA03 CA50 DA03 DA07 3H033 AA02 BB02 BB06 BB20 CC01 CC03 DD25 DD29 EE03 EE05 EE19 3H035 AA01 AA06 5H002 AA07 AA09 AA10 AB06 AC08 AD00 AE08 5H605 AA01 BB05 DD02 CC05 DD02 CC01 DD01 DD02 DD09 DD16 FF04 KK10

Claims (2)

[Claims] 1. A motor comprising a fan section and a motor section.
A stator having a stator section, which is fixed inside a bracket having a circular cross section, wherein the stator has a pair of magnetic pole cores having exciting windings and opposite ends of the magnetic pole cores; An electric blower, comprising: a pair of arc-shaped yoke cores each having both ends connected to a portion thereof. 2. A ventilation gap between an outer surface of the yoke core and the bracket, which is narrower than an inner space between a rotor of the motor and the yoke core. The electric blower according to claim 1, wherein the blower is formed.