JP2002354751A - Electric motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electric motor which fully cools electric parts equipped within the electric motor and is manufactured with ease. SOLUTION: At the center of the drive substrate 10, a penetrating hole 10a having nearly the same diameter as the inside peripheral face of a first cylindrical part 3a is provided, and a cylindrical blower guide 13 is provided at the penetration hole 10a. Furthermore, an air vent port 13a is provided at the peripheral face of the blower guide 13, and one end of a blower duct is connected to the air vent port 13a of the blower guide 13, while the other end being disposed near a heat sink 11. On the other hand, a rotary shaft 4 is arranged at the center of the rotor 3. A plurality of blades 3c are arranged between a first cylinder part 3a to form the outer periphery of the rotor 3 and a second cylinder part 3b which is fixed to the outer periphery of the rotary shaft 4 and corresponds to the rotor 3 to be integrally formed as the rotor 3. By rotating the rotor 3 in the prescribed direction, air current is generated in the direction of the drive substrate 10, and the air current directly hits the heat sink 11 by way of the air vent duct 14.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to an electric motor,
More specifically, the present invention relates to an electric motor having a cooling fan therein.

[0002]

2. Description of the Related Art Conventionally, an electric motor has a structure shown in a sectional view of FIG. The stator 81 has a plurality of teeth on the inner periphery of the yoke of the stator core. Slots are formed on both sides of the teeth, and the winding 82 is wound around the teeth. On the other hand, the outer periphery of the rotor 83 is a first cylindrical portion 83a, and a rotary shaft 84 is provided at the center thereof. A second cylindrical portion 83b is fixed to the outer periphery of the rotating shaft 84, and the inner peripheral surface of the first cylindrical portion 83a and the outer peripheral surface of the second cylindrical portion 83b serve as a connecting portion for connecting the two. Cylindrical wheel 83
The first cylindrical portion 83a, the second cylindrical portion 83b, and the wheel 83c are integrally formed by a plastic magnet. Further, a tip surface 85 of the tooth portion facing the rotation axis 84 and an outer peripheral surface 86 of the first cylindrical portion 83a.
Are opposed to each other with a gap therebetween, and the rotating shaft 84 of the rotor 83 is
Is supported by a bearing 87. A bracket 88 to which the bearing 87 is fixed holds the stator 81 from both sides.

A drive board 90 on which electronic components are mounted is disposed on one side of a stator 81 in a bracket 88. A transistor inverter IC 89 is provided near the outer peripheral end of the drive board 90, and a heat radiating portion of the transistor inverter IC 89 is fixed to the inner surface of the bracket 88 by a heat conductive adhesive 91.
The heat is dissipated.

However, the heat conductive adhesive 91 is relatively expensive, and it is difficult to obtain a sufficient heat radiation effect. Further, while keeping the heat radiation part of the transistor inverter IC 89 and the bracket 88 insulated, the clearance between them can be kept at a predetermined value. Since it has to be dimensioned, this work takes time and increases costs.

[0005]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems and to provide a motor which can sufficiently cool electronic components provided inside the motor and can be easily manufactured.

[0006]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention is to wind a winding around slots formed on both sides of a plurality of teeth provided on the inner periphery of a yoke portion of a stator core. And a substrate provided on one side of the stator, having a through hole at the center, a substrate on which electronic components are mounted on the surface, a rotating shaft at the center, and a first cylindrical portion on the outer periphery. A rotor having a second cylindrical portion fixed to an outer periphery of the rotating shaft, and integrally molded with a plastic magnet via a connecting portion connecting the first cylindrical portion and the second cylindrical portion. And a bearing that supports the rotating shaft of the rotor, and a bracket attached from both sides of the stator. A plurality of blades fixed to the surface and having base ends fixed at equal intervals on the outer periphery of the second cylindrical portion Becomes, the airflow generated by the rotation of the blades of the rotor, cooling the electronic component.

[0007] Further, an insertion hole for the substrate is inserted between a side surface of the rotor in the direction of the substrate and a side surface of the bracket corresponding to the side surface, and a ventilation hole is provided on a circumferential surface. A cylindrical air blower guide is provided, and the airflow blown from the side surface of the rotor toward the substrate in parallel with the rotation axis is changed in a direction perpendicular to the rotation axis.

In addition, there is provided a ventilation duct having one end connected to the ventilation port on the outer periphery of the ventilation guide and the other end disposed near the electronic component.

Further, an opening of the air guide in the side direction of the bracket is closed.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an electric motor according to the present invention will be described in detail with reference to the drawings. FIG. 1 is a sectional view showing an embodiment of an electric motor according to the present invention, and FIG. 2 is a perspective view showing a main part of FIG. The stator 1 has a plurality of teeth on the inner periphery of the yoke of the stator core. Slots are formed on both sides of the teeth and the winding 2 is wound thereon. On the other hand, rotor 3
Has a first cylindrical portion 3a at an outer peripheral portion, and has a rotating shaft 4 at the center thereof. A second cylindrical portion 3b is fixed to the outer periphery of the rotating shaft 4. Further, an inner peripheral surface of the first cylindrical portion 3a and an outer peripheral surface of the second cylindrical portion 3b are connected to a connecting portion 12 connecting the two. The first cylindrical portion 3a, the second cylindrical portion 3b, and the connecting portion 12 are integrally formed of a plastic magnet. Further, the tip end surface 5 of the tooth portion facing the rotation shaft 4 and the outer peripheral surface 6 of the first cylindrical portion 3a are opposed to each other with a gap therebetween, and the rotation shaft 4 of the rotor 3 is supported by the bearing 7. . The bracket 8 to which the bearing 7 is fixed is
The stator 1 is held from both sides.

A drive board 10 having a transistor inverter IC 9 is disposed in the bracket 8 on one side of the stator 1. Transistor inverter IC
The surface of 9 is provided with a heat sink 11 for heat radiation. The drive substrate 10 has a disk shape, and has an insertion hole 10a having substantially the same diameter as the inner peripheral surface of the first cylindrical portion 3a at the center. A blowing guide 13 is provided. One end of the air guide 13 is provided with a flange,
It is fixed to the back surface of the drive substrate 10 with an adhesive. Also,
The other end of the air guide 13 is in contact with the side surface of the bracket 8, and is entirely covered by the side surface of the bracket 8.
Further, a ventilation port 13 a is provided on the circumferential surface of the air guide 13, and one end of the air duct 14 is connected to the air guide 13.
And the other end of the heat sink 1
1 is disposed in the vicinity.

On the other hand, the rotor 3 has a function of a connecting portion 12 between a first cylindrical portion 3a forming the outer periphery of the rotor 3 and a second cylindrical portion 3b corresponding to the rotor 3. It has a plurality of blades 3c. The blade 3c has a distal end fixed to the inner peripheral surface of the first cylindrical portion 3a, and a proximal end fixed to the second cylindrical portion 3b.
Are arranged at equal intervals on the circumference of the circle, and the rotor 3 is rotated in a predetermined direction to blow air in the direction of the drive substrate 10. In the rotor 3, the first cylindrical portion 3a, the blades 3c, and the second cylindrical portion 3b are integrally formed by a plastic magnet, so that a special fan for blowing air is created and the labor for assembling is omitted. be able to.

The operation of the above configuration will now be described. When the rotor 3 rotates in a predetermined direction, the blades 3c also rotate at the same time, so that an airflow is generated in the direction of the drive substrate 10. The airflow is guided into the inside of the air guide 13, but since the end is entirely covered by the side surface of the bracket 8, the air flows into the air vent 13 a on the outer periphery of the air guide 13 and cools the heat sink 11 through the air duct 14. I do. The blown air flows through the slots of the teeth of the stator 1 from the outer peripheral end of the drive board 10 and returns to the suction side of the rotor 3 while being cooled on the inner surface of the bracket 8.

As described above, since the rotor 3 is provided with the blades 3c, no special place for disposing the blower fan is required, and the motor can be downsized. Further, since the airflow is circulated along the inner surface of the bracket 8 from the center of the electric motor, the entire bracket 8 can be efficiently cooled. Further, since the air guide 13 is provided, the air flow can be blown out in any direction of the drive substrate 10. In addition, by using the blower duct 14, it is possible to intensively cool an arbitrary component on the drive board 10. Further, by adopting a structure in which the opening of the air guide 13 in the side direction of the bracket 8 is closed, the same effect can be obtained even if the side of the bracket 8 is separated from the opening of the air guide 13.

[0015]

As described above, according to the electric motor of the present invention, the distal end is fixed to the inner peripheral surface of the first cylindrical portion, and the proximal end is positioned on the circumference of the second cylindrical portion. It is a structure of a connecting part consisting of multiple blades fixed at equal intervals, and the airflow generated by the rotation of the rotor blades cools the electronic components, so that a special place for arranging the blower fan is required. And the motor can be downsized. In addition, since the airflow circulates from the center of the motor along the inner surface of the bracket, efficient cooling can be performed on the entire bracket.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of a motor according to the present invention.

FIG. 2 is a perspective view showing a main part of FIG.

FIG. 3 is a sectional view showing a conventional electric motor.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Stator 2 Winding 3 Rotor 3a 1st cylindrical part 3b 2nd cylindrical part 3c Blade 4 Rotating shaft 5 Tip surface 6 Outer peripheral surface 7 Bearing 8 Bracket 9 Transistor inverter IC 10 Driving board 10a Insertion hole 11 Heat sink 12 Connection Part 13 Ventilation guide 13a Ventilation port 14 Ventilation duct

 ──────────────────────────────────────────────────続 き Continued on the front page F-term (reference) 5H002 AB08 AC06 AD04 AD09 AE08 5H609 BB03 BB19 PP02 PP16 QQ02 QQ10 QQ12 QQ23 RR03 RR06 RR07 RR10 RR24 RR27 RR33 RR35 RR38 RR42 RR43 RR44 RR69 RR73 CB01 A06 PP11 QA03 QA10

Claims (4)

[Claims] 1. A stator having windings wound around slots formed on both sides of a plurality of teeth provided on an inner periphery of a yoke portion of a stator core, and disposed on one side of the stator. A through hole is provided at the center, a substrate on which electronic components are mounted on the surface, and a rotating shaft is provided at the center, a first cylindrical portion is provided on the outer periphery, and a second cylindrical portion is fixed to the outer periphery of the rotating shaft. A rotor integrally molded with a plastic magnet via a connecting portion that connects the first cylindrical portion and the second cylindrical portion, and a bearing that supports the rotating shaft of the rotor. An electric motor comprising a bracket attached from both sides of the stator, wherein the connecting portion has a distal end portion fixed to an inner peripheral surface of the first cylindrical portion, and a proximal end portion of the second cylindrical portion. It consists of a plurality of blades fixed at equal intervals on the outer circumference, and the airflow generated by the rotation of the rotor blades Ri, motor, characterized by comprising cooling the electronic component. 2. A board is provided between a side surface of the rotor in the direction of the substrate and a side surface of the bracket corresponding to the side surface, and a ventilation hole is provided on a circumferential surface of the rotor. 2. A cylindrical air blower guide, wherein an airflow blown from a side surface of the rotor toward the substrate in parallel with the rotation axis is changed in a direction perpendicular to the rotation axis. Electric motor. 3. The electric motor according to claim 2, wherein one end is connected to the ventilation port on the outer periphery of the air guide, and the other end is provided with an air duct arranged near the electronic component. . 4. The electric motor according to claim 2, wherein an opening of the air guide in a side direction of the bracket is closed.