JP3432112B2 - Electric vacuum cleaner - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric blower having a small air flow resistance of an air flow discharged from a blower to a commutator motor side, and an electric vacuum cleaner equipped with the electric blower.

[0002]

2. Description of the Related Art In an electric blower in which the air flow from a blower is exhausted to the commutator motor side, in order to realize a higher efficiency electric blower, the efficiency of the commutator motor and the blower must be increased and the exhaust air passage Loss reduction is an important issue.

The losses of the commutator motor are mainly copper loss, iron loss,
There is mechanical loss, of which copper loss is mainly resistance loss of the rotor and stator windings. Conventionally, in order to reduce the copper loss in order to improve the efficiency, it has been general to increase the wire diameter of the winding to reduce the winding resistance.

Further, it has been known that the surface roughness of the stator or the rotor greatly affects the ventilation loss in the air passage of the air flow exhausted from the commutator motor side.
Heretofore, little attention has been paid to measures against this surface unevenness.

[0005]

In the conventional electric blower using the commutator motor, the winding diameter of the rotor or the stator is increased in order to reduce the copper loss. In particular, by thickening the winding wire of the stator arranged in the air flow path of the air blower, the winding surface unevenness of the winding wire becomes large, the ventilation resistance increases, and the efficiency of the electric blower decreases. There was a problem.

An object of the present invention is to provide an electric blower that reduces the copper loss of the stator winding and also reduces the ventilation resistance of the winding surface of the stator winding, and an electric vacuum cleaner equipped with the electric blower. is there.

[0007]

In order to achieve the above object, the present invention comprises a suction port for sucking dust and the like, and a cleaner body having a built-in electric blower for giving suction force for sucking the dust and the like to the suction port. In the electric vacuum cleaner, the electric blower has a commutator motor having a rotor fixed to a rotary shaft and a stator provided on an outer circumference of the rotor, and a blower having a centrifugal fan directly connected to the rotary shaft. Consists of and
An air flow generated by the rotation of the centrifugal fan flows near the stator and is exhausted to the outside, and each stator winding wound around each magnetic pole of the stator is composed of at least two electric wires. The stator winding is arranged in the air passage of the air flow from the centrifugal fan.

As another feature of the present invention, each of the stator windings is formed by first winding the first electric wire, and then by winding the second electric wire on the wound first electric wire. And a third electric wire is wound on the wound second electric wire.

Another feature of the present invention is that each of the stator windings is composed of a collective winding winding in which the at least two electric wires are wound together.

Another feature of the present invention is that the at least two electric wires have the same wire diameter.

Another feature of the present invention is that at least one of the at least two electric wires has a wire diameter different from that of the other electric wires.

According to the present invention, each stator winding wound around each magnetic pole of the stator is composed of at least two electric wires.

As described above, since the stator winding is composed of at least two electric wires, the stator winding becomes a thin wire and becomes plural.
The cross-sectional area is substantially increased by the plurality, and the effect of reducing the copper loss can be obtained. Further, since the wire is thin, the irregularities on the winding surface of the winding can be reduced.

Further, since each stator winding can be formed by a sequential winding winding or a collective winding winding, productivity and quality control can be improved.

Further, since it is possible to make the wire diameters of the electric wires of the stator winding the same or to construct the electric wires of different wire diameters, it is possible to increase design choices.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION An electric blower according to an embodiment of the present invention and an electric vacuum cleaner equipped with the electric blower will be described below with reference to the drawings.

FIG. 2 is a perspective view showing the overall structure of an electric vacuum cleaner equipped with an electric blower according to an embodiment of the present invention. This vacuum cleaner is installed in a suction port 28 for sucking in dust, an extension pipe 27 for connecting the suction port 28 to a tip and carrying inhaled dust, etc., and is incorporated in the extension pipe 27 to be operated by a user to generate a use signal. An operation switch unit 26 and a hose 25 which is connected to the extension pipe 27 and sends dust and the like from the extension pipe 27 to the cleaner body 29.
It is composed of a cleaner body 29 in which the electric blower 1 for giving a suction force to the suction port 28 is incorporated.

FIG. 1 is a sectional view showing the internal structure of an electric blower according to an embodiment of the present invention. The electric blower 1
It is roughly divided into a commutator motor and a blower.

On the commutator motor side, a housing 2, a stator 3 fixed to the housing 2, a rotating shaft 5 held by a bearing 4a provided on the housing 2 and a bearing 4b provided on the end bracket 16 are provided. , Rotating shaft 5
A rotor 6 fixed to the rotary shaft 5, a commutator 7 fixed to the rotary shaft 5, a brush 8 for electrically connecting the commutator 7, and a brush holder 9 holding the brush 8 and fixed to the housing 2. It consists of and.

On the blower side, a centrifugal fan 12 fixed to one end of the rotary shaft 5 by a screw 17, a straightening plate 13 for straightening the air flow from the centrifugal fan 12, and a casing covering the centrifugal fan 12 and the straightening plate 13. 14 and.

The commutator 7 has a commutator piece 7a on its circumferential surface, and each commutator piece 7a is a rotor winding 6a in the rotor 6.
Connected with. The brush 8 is pressed against the commutator 7 by the spring 10 and is in sliding contact with the commutator 7. Reference numeral 11 is a lead wire electrically connected to the brush 8 for connecting the brush 8 and the external electrode, and is connected to a terminal (not shown) provided on the brush holder 9.

The stator 3 comprises a stator core 3a having two magnetic poles facing each other and a stator winding 3b wound around each of the magnetic poles. The stator winding 3b is composed of two electric wires having the same diameter. Each has the same number of turns.

When the electric blower 1 is energized and starts to operate, first the rotor 6 rotates, and the centrifugal fan 12 fixed to the rotary shaft 5 of the rotor 6 rotates. When the centrifugal fan 12 rotates, air flows in from the air intake port 15 of the casing 14, passes through the centrifugal fan 12 and the rectifying plate 13 and flows into the inside of the electric motor, passes through the inside of the electric motor, and has a hole (not shown) in the housing 2. Exhausted from the outside.

Electric vacuum cleaners have conventionally been required to have a strong suction force, and in particular, this tendency has recently become stronger, but in order to realize this, it is essential to improve the performance of the electric blower 1.

Here, the characteristics of the electric blower 1 are represented by an electric input and an aerodynamic output, and the efficiency is expressed by the following equation. Electric blower efficiency (%) = (Blower output (W) -Ventilation loss (W)) / Motor input (W) As can be seen from the above formula, in order to realize high efficiency of the electric blower, the commutator motor is required. Also, improving the efficiency of the blower and reducing the loss of the ventilation air passage are important issues.

The losses of the commutator motor are mainly copper loss, iron loss,
There is mechanical loss, of which copper loss is mainly the rotor 6
And the resistance loss of the stator winding 3b. FIG. 3 shows a perspective view of the stator 3. Conventionally, to reduce the copper loss, it has been general to increase the wire diameter of the winding to reduce the winding resistance in order to improve the efficiency. .

However, although the winding resistance is reduced by thickening the winding wire of the stator 3 arranged in the air passage of the air flow from the blower, the winding surface unevenness of the winding wire becomes large and the ventilation is increased. The problem of increased resistance has become apparent.

FIG. 5 shows a partial cross-sectional view of an electric blower in which the stator is wound by a conventional thick wire and the air flow, and FIG.
The partial cross section figure of the electric blower which concerns on one Example of this invention, and the flow of an air flow are shown.

That is, surface irregularities of the stator 3 or the rotor 6, especially irregularities of the winding surface of the windings of the stator 3 impede the air flow indicated by the arrow in the figure and greatly affect the ventilation loss. Nevertheless, conventionally, little consideration has been given to the increase in ventilation resistance due to this unevenness.

In this embodiment, in order to reduce the winding resistance and the ventilation resistance, the stator core 3a
The stator winding 3b wound around each of the magnetic poles is composed of two electric wires.

With such a structure, the stator winding becomes a thin wire and becomes plural. Even if the electric wire is a thin wire, the cross-sectional area is substantially increased by making it plural, and it is possible to obtain the effect of reducing the copper loss equal to or equal to that of the thick wire. Actually, the thinning reduces the dead space between the windings, and the space factor can be increased compared to, for example, the thick line to reduce the copper loss. Further, since the wire is thin, the irregularities on the winding surface of the winding can be reduced to reduce the ventilation resistance and improve the efficiency of the electric blower 1.

FIG. 6 shows the characteristics of the electric blower in this embodiment. In the figure, the characteristic indicated by the dotted line is the characteristic of the electric blower in which the conventional stator winding is configured by one thick electric wire, and the characteristic of the electric blower according to the present embodiment is indicated by the solid line. In the conventional example, the ventilation loss W is large due to the ventilation resistance due to the unevenness of the winding surface of the stator winding, and the suction work rate P is smaller than in this example. In this embodiment, since the irregularities on the surface of the stator winding are small, the ventilation loss W is small,
It can be seen that the suction power P is larger than that of the conventional example, and the efficiency of the electric blower is improved.

As a method of winding two electric wires according to this embodiment, the first electric wire is wound first, and then the second electric wire is wound on the first electric wire. You can select the method of winding with, or the method of winding the wires of the first wire and the second wire together instead of sequentially by using a group winding wire. It may be selected according to conditions such as quality control.

In this embodiment, the example in which the stator winding 3b is composed of two electric wires has been described, but it may be composed of two or more electric wires.

Further, it is possible to make the wire diameters of the respective wires of the stator winding 3b the same or to construct the wires of different wire diameters, and design choices such as copper loss reduction and space factor improvement. Can be increased.

[0036]

According to the present invention, since the stator winding wound around each magnetic pole of the stator core of the commutator motor is composed of two or more electric wires, the copper loss of the stator winding is reduced. The air resistance of the stator winding surface can be reduced and the efficiency of the electric blower can be improved.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an internal structure of an electric blower according to an embodiment of the present invention.

FIG. 2 is a perspective view of an entire configuration of an electric vacuum cleaner including the electric blower of FIG.

3 is a perspective view of a stator of the electric blower of FIG. 1. FIG.

FIG. 4 is a diagram showing a partial cross section of an electric blower of a conventional example and a flow of air flow.

5 is a diagram showing a partial cross section of the electric blower of FIG. 1 and a flow of air flow.

FIG. 6 is a diagram showing characteristics of an electric blower according to an embodiment of the present invention.

[Explanation of symbols]

1 ... Electric blower, 2 ... Housing, 3 ... Stator, 3a ...
Stator core, 3b ... Stator winding, 5 ... Rotating shaft, 6 ... Rotor, 12 ... Centrifugal fan, 13 ... Rectifier plate, 14 ... Casing, 15 ... Air intake port

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Fumio Jouraku 1-1-1 Higashitaga-cho, Hitachi-shi, Ibaraki Hitachi Ltd. Electric Appliances Division (56) Reference JP-A-9-140079 (JP, A) ) JP-A-4-105531 (JP, A) JP-A-2-269431 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) H02K 3/04 H02K 3/14 A47L 9 / 28 H02K 9/06

Claims (5)

(57) [Claims] 1. An electric vacuum cleaner having a suction port for sucking dust and the like, and a cleaner body containing an electric blower for giving a suction force for sucking the dust and the like to the suction port, wherein the electric blower is fixed to a rotary shaft. A rotor and a commutator motor having a stator provided on the outer periphery of the rotor, and a blower having a centrifugal fan directly connected to the rotating shaft, wherein an air flow generated by rotation of the centrifugal fan is Each stator winding that flows in the vicinity of the stator and is exhausted to the outside and is wound around each magnetic pole of the stator comprises at least two electric wires, and the stator winding is connected to the centrifugal fan. The electric vacuum cleaner, which is arranged in the air passage of the air flow. 2. The stator winding according to claim 1, wherein each of the stator windings has a first electric wire wound first, and then a second electric wire is wound on the wound first electric wire. An electric vacuum cleaner , further comprising a winding wire in which a third electric wire is wound on the wound second electric wire. 3. The method of claim 1, wherein each of the stator windings, electrical, characterized in that it is composed together winding windings wound around together with said at least two wires
Vacuum cleaner . 4. The method of claim 1, wherein the at least two wires, electric characterized by having the same wire diameter from each other
Vacuum cleaner . 5. The electric vacuum cleaner according to claim 1, wherein at least one of the at least two electric wires has a wire diameter different from that of the other electric wires.