JPH07255649A - Vacuum cleaner - Google Patents

Abstract

PURPOSE:To reduce the size of a vacuum cleaner, by reducing a motor size and installing a cord winder on the periphery of the frame of the motor. CONSTITUTION:A rare earth magnet 5 such as samarium cobalt, etc., is used for the stator of a vacuum cleaner motor to reduce the outer diameter of the motor. A cord winder is easily mounted on the outer periphery of the motor by adjoining a brush part 4 and a blowing fan 10 by integrating the brush part 4 and a bracket 9 serving as a part of a fan case 11. The end of the rare earth magnet 5 is shaped into a wedge and integrated into a yoke 6 to reduce the leak flux of the motor stator. A protrusion and a slit are set on the yoke 6 and a frame 7 respectively to make positioning and constructing easier.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric motor and a cord winding device for an electric vacuum cleaner.

[0002]

2. Description of the Related Art Conventionally, as disclosed in Japanese Patent Laid-Open No. 53-53163, a cord winding device is provided so as to surround the outer periphery of an electric motor of an electric vacuum cleaner, which is shown in FIG. Show. In FIG. 5, a field winding 20 is provided in the stator, and a cord winding device 21 is concentrically provided so as to surround the outer periphery of the frame 7 of the electric motor. Further, in this electric motor, like the electric motor of a general electric vacuum cleaner, the brush portion 22 is installed on the side opposite to the blower fan 10, and the cord winding device 2 is provided.
1 has a shape that also surrounds the brush portion 22.

The details of the brush section 22 are shown in FIG. Since the brush 16 needs to be positioned vertically on the frame 7 of the electric motor and is directly attached to the cylindrical portion of the frame 7, the brush holder 23 is shaped so as to follow the frame 7.

Further, as disclosed in Japanese Utility Model Publication No. 60-41823, there is also known one in which a rare earth magnet is attached to the inner circumference of a yoke of a stator to reduce the size of an electric motor.

[0005]

In the conventional motor having the field winding 20 in the stator, the outer diameter of the frame 7 becomes large, and when the cord winding device 21 is installed on the outer periphery of the frame 7, a predetermined length is obtained. In order to wind up the cord, it is necessary to increase the outer diameter of the cord winding device 21.

When the brush portion 22 is provided on the side opposite to the blower fan 10 like the electric motor of a general electric vacuum cleaner, there are protrusions on both sides of the frame 7, and the shape of the cord winding device 21 is protruded. It could not be easily incorporated into the frame 7 of the electric motor, avoiding objects and having a complicated shape.

Further, as shown in FIG. 6, since the brush holder 23 is shaped so as to extend along the frame 7, it is necessary to assemble the brush portion 22 and the parts of the cord winding device 21 while holding the electric motor by hand. It took time.

On the other hand, if a magnet piece of a rare earth magnet is adhered or fixed to the inner circumference of the yoke of the electric motor in order to reduce the size of the electric motor, leakage flux is likely to occur because the magnetic piece has a large magnetic flux density.

An object of the present invention is to provide an electric vacuum cleaner in which the cord winding device can be compactly and easily assembled on the outer circumference of the motor by downsizing the electric motor and changing the arrangement of parts.

[0010]

The electric vacuum cleaner of the present invention comprises:
A DC motor with a rare earth magnet incorporated in the stator is used to reduce the outer diameter of the electric motor, and a cord winding device is installed on the outer periphery of the electric motor. The brush portion is located adjacent to the blower fan, a flange is provided on the frame of the electric motor, and the bracket of the electric motor, which also functions as a part of the fan cover, and the brush portion are integrally attached.

Further, a rare earth magnet piece having wedge-shaped ends on both sides is incorporated into a yoke of the electric motor to form a stator, and a protrusion for fixing the yoke to the frame is provided in parallel with the shaft.
The frame has slits corresponding to the protrusions.

[0012]

By using a rare earth magnet having a large magnetic flux for the stator of the electric motor, the stator is miniaturized and the cord winding device can be compactly installed on the outer periphery of the electric motor.

Further, the brush part of the electric motor is adjacent to the blower fan by integrally attaching the bracket partly functioning as a part of the fan case and the brush part to the flange on one side of the electric motor, and the protruding part on one side of the frame of the electric motor is eliminated. The cord winding device can be easily incorporated.

The end portion of the rare earth magnet embedded in the yoke of the electric motor has a wedge shape, so that the magnetic flux easily enters the armature and the leakage magnetic flux can be reduced.

Further, the stator is easily positioned on the frame by the slit of the frame corresponding to the projection parallel to the axis provided on the yoke, and the assembling and fixing becomes easy.

[0016]

The present invention will be described with reference to the drawings.

FIG. 1 is a sectional view of a main part of an electric vacuum cleaner according to the present invention, in which an armature 2 and a commutator 3 are attached to an armature shaft 1, and a brush portion 4 and a commutator 3 are passed through. Electric power is supplied to the winding (not shown) of the armature 2.

A rare earth magnet 5 such as samarium cobalt is embedded in the inner circumference of the yoke 6, a flange 8 is provided on one side of the frame 7 on the outer circumference of the yoke 6, and the brush portion 4 is integrated with the bracket 9. Installed. A blower fan 10 is attached adjacent to the brush portion 4, and a fan case 11 covers the blower fan 10. The bracket 9 also serves as a part of the fan case,
The air sucked by the blower fan 10 passes through the fan case 11 as shown by the arrow, part of which cools the inside of the electric motor to come out from the other side of the frame 7, and part of it goes out of the bracket 9 to the outside of the electric motor. Go on.

The cord winding device 12 is provided concentrically with the frame 7 so as to surround the outer periphery of the frame 7.

FIG. 2 is a schematic sectional view of the electric motor portion of the vacuum cleaner of the present invention, in which a rare earth magnet 5 made of samarium cobalt magnet or the like is embedded in the inner circumference of the yoke 6. The magnetic flux generated by the rare earth magnet 5 is 6000 gauss, which is almost the same as the magnetic flux generated by the conventional field winding 20, and the end portion 13 has a shape in which the cross-sectional area decreases toward the tip of the outer circumference, for example, the end. The cross section of the portion 13 is wedge-shaped toward the outer periphery, and the small-sized rare earth magnet 5 having a high magnetic flux density is embedded in the yoke 6 to facilitate fixing and the magnetic flux is directed toward the inside of the armature 2 from the outer periphery of the yoke 6. To reduce the leakage flux.

A plurality of protrusions 14 parallel to the armature shaft 1 are provided on the outer peripheral surface of the yoke 6, and the slits 15 of the frame 7 corresponding to the protrusions 14 allow the yoke 6 to be easily positioned and fixed to the frame 7.

FIG. 3 is a view showing the details of the brush section 4,
It comprises a brush support 17 slidably supporting the brush 16, a terminal 18 for supplying electric power to the brush 16, and an insulating brush holder 19 having a mounting portion. Inside the brush holder 19, a lead wire and a spring (not shown) are provided. is there. The brush 16 and the terminal 18 are electrically connected by a lead wire, and the spring is for pressing the brush 15 to the commutator 3.

Here, the case where a conventional electric motor is used with a suction power of about 360 w and the case where the electric motor of the present invention is used is compared.

The armature and the blower fan are the same, and the axial dimension is also 75 mm. By changing the field by the winding to the field by the rare earth magnet, two poles having a thickness of the yoke 6 of 5 mm and the thickness of the rare earth magnet 5 of 130 ° within a range of 130 ° are provided, and the gap between the armature 2 and the yoke 6 is set to 0. If it is 0.5 mm, the outer diameter of the frame 7 of the electric motor is 50 mm.

The explanatory view of FIG. 4 shows the result of measuring the suction power of this electric motor alone. Due to the pressure loss due to the piping, the pressure loss due to the filter and the dust bag, the suction power of the electric vacuum cleaner is 36 when the suction power of the electric motor is 400w.
It becomes 0w.

Therefore, the outer diameter of the conventional electric motor is 85 m.
Since it is m, the outer diameter dimension is reduced to 59%.

As described above, since the outer diameter of the electric motor is reduced, the inner diameter of the cord winding device provided so as to surround the outer periphery of the electric motor can be reduced, and the vacuum cleaner can be downsized as a whole.

When the cord winding device 12 is assembled, the blower fan 10 and the brush portion 4 are provided on one side, and the cord winding device is assembled and mounted easily from the other side without these protrusions. You can

[0029]

As described above, according to the present invention, the outer diameter of the electric motor is reduced by incorporating the rare earth magnet having a large magnetic flux density in the stator of the electric motor, and the space around the outer periphery of the electric motor is effectively used to provide the cord winding device. Since it is installed, the vacuum cleaner can be downsized.

Since the end portion of the rare earth magnet has a wedge-like shape whose cross-sectional area decreases along the outer circumference of the rare earth magnet toward the tip, leakage flux can be reduced.

Since the yoke and the frame are provided with protrusions and slits for positioning, respectively, the yoke can be easily inserted and fitted.

Further, since the blower fan and the brush section are installed adjacent to each other on one side, there is no protrusion on the other side of the electric motor, and the shape of the cord winding device is simplified, and the outer circumference of the electric motor is reduced. It's also easy to put on.

Since a flange is provided on the frame of the electric motor and the brush portion is integrally attached to the flange together with the bracket, the assembly time for them is reduced.

[Brief description of drawings]

FIG. 1 is a sectional view of a main part of an electric vacuum cleaner according to the present invention.

FIG. 2 is a sectional view of an electric motor used in the present invention.

FIG. 3 is a schematic view of a brush portion of an electric motor used in the present invention.

FIG. 4 is an explanatory diagram of measured values of suction power of a single electric motor used in the present invention.

FIG. 5 is a sectional view of a main part of a conventional electric vacuum cleaner.

FIG. 6 is a schematic view of a brush portion of an electric motor used in a conventional electric vacuum cleaner.

[Explanation of symbols]

 4 Brush Part 5 Rare Earth Magnet 6 Yoke 7 Frame 8 Flange 9 Bracket 10 Blower Fan 12 Code Winding Device 13 Rare Earth Magnet End 14 Protrusion 15 Slit 18 Brush Holder

Claims (5)

[Claims] 1. An electric vacuum cleaner, wherein a rare earth magnet such as samarium cobalt magnet is used for a stator of an electric motor of the electric vacuum cleaner, and a cord winding device is concentrically provided on an outer periphery of a frame of the electric motor. 2. A stator of an electric motor according to claim 1, wherein the rare earth magnet is incorporated in a yoke, and an end portion of the rare earth magnet has a shape in which a cross-sectional area decreases toward a tip. Electric motor. 3. An electric motor according to claim 1, wherein a protrusion for fixing the yoke to the frame is provided on an outer periphery of the yoke of the electric motor in parallel with an axis, and a slit is provided at a corresponding position of the frame. 4. An electric vacuum cleaner, wherein a brush portion of an electric motor of the electric vacuum cleaner is provided at a position adjacent to a blower fan. 5. The electric vacuum cleaner according to claim 4, wherein the frame of the electric motor is provided with a flange, and the bracket of the electric motor is integrally attached to the flange together with the brush portion.