JPH0928641A - Vacuum cleaner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make a vacuum cleaner highly efficient, small-sized and lightweight by setting the fan diameter at a specific value with the revolution speed of the electric blower set at a specific value in a specific range of the air capacity. SOLUTION: An electric blower is structured with a motor part 20 and a fan part 30, the motor part 20 being a commutator motor, with a stator 23 and a rotor 24 stored in a space partitioned by a bottomed tubular housing 21 having one end open and by an end bracket 22. An air flow produced by the fan part 30 is introduced to the motor part 20 through an air vent formed in the end bracket 22, circulated inside the motor part 20 for cooling, and discharged outside from an exhaust port 21a formed on the outer circumferential wall of the housing 21. In this case, in the air capacity in a range of approximately 1.0m<3> /min, with the revolution speed of the blower set at 40,000rpm, the fan diameter is made about 95mm or less, and with the speed at 50,000rpm, the fan diameter is made about 76mm or less.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vacuum cleaner, and more particularly to a vacuum cleaner using an electric blower with improved efficiency.

[0002]

2. Description of the Related Art Conventionally, an electric vacuum cleaner sucks air containing dust from a suction port through a hose, and the suction force rotates a fan provided at the shaft end of a motor to fix the air sucked from the fan. It is configured to be guided to the inside of the motor through the guide vanes and then discharged to the outside. Further, a paper bag for collecting dust is provided in front of the motor to guide dust-containing air so that only dust can be accumulated therein.

The power source of the motor for driving the fan for obtaining the suction force is a single-phase AC, and a single-phase AC commutator motor having a series winding characteristic is used. In this case, there are a case where the applied voltage is directly put in the operation and a case where the motor rotation speed is controlled by changing the voltage by phase control by a switching element such as a triac.

When a brushless DC motor is used as the motor, the magnitude and frequency of the voltage applied to the brushless DC motor via the converter and the inverter are controlled to control the rotation speed to an arbitrary value. In each case,
The electric power consumption of the conventional motor is about 1000 (W), and the rotation speed of the electric blower is 3 when the air volume is about 1.0 (m ³ / min).
It is currently set to 7,000 (rpm) or less, and the electric blower efficiency is currently 49 (%) or less.

[0005]

In order to improve the suction power, it is necessary not only to improve the efficiency of the electric blower but also to improve the suction power by eliminating the leakage of air from the main body that houses the electric blower. The improvement of the suction work rate can shorten the cleaning time and save energy. However, a motor that is often used at present is a single-phase AC commutator motor, and since this motor has a commutation phenomenon that is a switching action due to mechanical sliding by a commutator and a brush,
In the rectifying coil short-circuited with the brush, a transformer electromotive force is also generated by the reactance voltage and the transformer action, and if the voltage between the two exceeds the spark voltage at the moment when the commutator piece leaves the brush, sparks occur. To grow. Therefore, when the spark generated from the brush is large, there is a problem that the wear of the brush is increased and the life of the brush is shortened.

Therefore, in order to maintain the same brush life as the conventional one and improve the suction power, it is necessary to optimize the motor dimensions, fan dimensions and rotation speed.

It is an object of the present invention to provide an electric vacuum cleaner using an electric blower which is highly efficient and is small and lightweight.

[0008]

To achieve the above object, the present invention is characterized in that a field winding of a stator and an armature winding of an armature are constituted by a series circuit, The magnetic winding and the armature winding are configured by a circuit electrically connected in series via a mechanical sliding contact between a brush and a commutator,
A single-phase AC commutator motor having the stator and the armature core formed of a laminated core; a centrifugal fan provided at the shaft end of the single-phase AC commutator motor; fixed guide vanes; and the centrifugal fan,
In an electric vacuum cleaner equipped with an electric blower composed of a casing covering the fixed guide vanes, the air volume is about 1.0 (m ³ / mi).
n), the rotation speed of the electric blower is set to 40,000 (rp
When it is set to m), the fan diameter is set to about φ95 (mm) or less, and when the rotation speed of the electric blower is set to 50000 (rpm), the fan diameter is set to about φ76 (mm) or less.

Further, a feature of the present invention is that the power consumption of the single-phase AC commutator motor is approximately 1000 (W).
When the rotation speed of the electric blower is set to 40000 (rpm) in the area where the air volume is approximately 1.0 (m ³ / min), the product thickness of the armature core and the stator core is 21 (mm). In the following, when the motor rotation speed is set to 50000 (rpm), the product thickness length of the armature core and the stator core is set to 16 (mm) or less.

Further, a feature of the present invention is that when the rotation speed of the electric blower is set to 40000 (rpm), the total number of conductors of the armature winding is set to 312 or more,
When the rotation speed of the electric blower is set to 50000 (rpm), the total number of conductors in the armature winding is 264 or more.

Further, a feature of the present invention is that when the rotation speed of the electric blower is set to 40,000 (rpm), the commutator outer diameter is set to φ23 (mm) or less and the rotation speed of the electric blower is reduced. At 50,000 (rpm), it is set to φ18 (mm) or less. Furthermore, the feature of the present invention is that the rotation speed of the electric blower is 40,000 to 500.
When set to 00 (rpm), set the conductor wire diameter of the armature winding to φ0.65 (mm) or more and the conductor diameter of the field winding to φ1.1 (mm) or more, and This is to reduce the copper loss and the copper loss of the field winding.

Further, a feature of the present invention is that the rotation speed of the electric blower is 40,000 to 50,000 (rpm).
When set to, set the commutator outer diameter to φ23 (mm) or less,
The brush dimension, which is the dimension of the brush in the sliding direction, is divided by the pitch of the commutator, and the segment dimension is set to 2.0 or less.

Further, as a feature of the present invention, in the brush, the connection between the brush and the pigtail is fixed with silver-plated copper powder, and at least three sides other than the sliding surface are copper-plated. I have a face.

[0014]

According to the present invention, the overall efficiency of the electric blower can be achieved at 50 (%) or more by defining the dimensions of each part in order to achieve high efficiency by high speed and small size and light weight.
The suction power can be improved.

[0015]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 5 is a perspective view showing the appearance of the vacuum cleaner according to the embodiment of the present invention.

In FIG. 1, reference numeral 501 is a cleaner body having a control circuit, an electric blower and the like built therein, and 502 is a cleaner body 5.
01, a hose connected to the suction port of No. 01, 503 is connected to one end of the hose and a hose handle for the user to grip, 504 is an extension pipe connected to the other end of the hose handle 503, 505 Is a mouthpiece connected to the extension pipe 504,
Reference numeral 506 is a switch operating portion provided on the hose proximal portion 503, 507 is a first infrared emitting portion provided at the hose proximal portion 503, 508 is a second infrared emitting portion provided at the hose proximal portion 503, and 509 is An infrared ray receiving portion provided on the upper surface of the cleaner body 501, and 510 indicates a ceiling in the room.

FIG. 6 shows a vertical sectional view of an electric vacuum cleaner according to an embodiment of the present invention.

The vacuum cleaner main body 501 has a lower case 601 that covers a lower portion at a front portion thereof, a lid 602 that covers an upper front portion thereof, a suction port 603 provided on a lid 602, and a dust collection chamber that houses a dust collecting bag. 604, an airtight holding cover 605 attached to the lid 602 by a member different from the lid 602 in order to maintain the airtightness in the dust collection chamber 604, and the lower case 6 at the rear part thereof.
01 and the upper case 606 formed by the electric blower room 60
Eight. In addition, the dust collecting chamber 604 has a dust bag 60.
7. The electric blower room 608 houses an electric blower 609 for collecting dust. This electric blower 609
A filter 610 is provided on the intake side of the filter and communicates with the dust collection chamber 604. A packing 611 is provided on an upper wall surface of the lower case 601 forming a lower portion of the dust collection chamber 604, and the packing 611 and the airtight holding cover 605 are pressed against each other to maintain the airtightness of the dust collection chamber 604. Like that. An upper case cover 612 is provided above the upper case 606.
The substrate housing portion 613 covered with the
4 are stored. The control board 614 is composed of one or more sheets and may be fixed to the upper case side or the upper case cover side. On the control board 614, an infrared light receiving element 615 that receives an infrared signal emitted from the first infrared light emitting portion 507 and the second infrared light emitting portion 508 of the hose hand portion 503 is provided. An infrared light receiving portion 509 formed of another material that transmits infrared light is provided on the upper case cover 512 so that an infrared signal reaches the infrared light receiving element 615. Infrared receiver 50
In 9, the upper case cover 612 itself may be integrally formed using a material that transmits infrared rays.

Next, the operation of the electric vacuum cleaner according to the present invention will be described with reference to FIGS. 5 and 6.

When the user of the vacuum cleaner presses one of the switch operating units 506 provided on the hose handle 503, the signal code according to the pressed switch serves as an infrared signal for the first infrared emitting unit 507 and the second infrared emitting unit 507. It is radiated from the infrared light emitting section 508 of. The first infrared light emitting unit 507 is arranged so as to face substantially vertically upward in a normal use state, and the infrared signal emitted from the first infrared light emitting unit 507 hits the ceiling or wall of the room and is reflected. Then, the infrared light receiving unit 509 of the cleaner body 501 is reached. In addition, the second infrared light emitting unit 5
08 is disposed at the grip end of the hose proximal portion so as to face downward from substantially horizontal, and the second infrared light emitting portion 5 is provided.
The infrared signal emitted from 08 is directly transmitted to the cleaner body 5
No. 01 reaches the infrared light receiving unit 509. Infrared receiver 5
The infrared signal reaching 09 is received by the infrared light receiving element 615, and the vacuum cleaner is controlled via the control board 614.

As shown in FIG. 6, the electric blower 609 built into the cleaner body 501 uses much of the space inside the cleaner body, and therefore a smaller electric blower is desired.
Moreover, in order to meet the demand from the market that requires a stronger suction force, an electric blower with an improved suction work rate is desired.

Hereinafter, the electric blower 609 according to the present invention will be described.
This will be described with reference to FIGS.

FIG. 1 is a vertical sectional view of the electric blower 609 of this embodiment. The electric blower 609 includes an electric motor unit 20 and a blower unit 30.

The electric motor section 20 is a commutator electric motor, and a stator 23 and a rotor 24 are housed in a space defined by a bottomed cylindrical housing 21 end bracket 22 having one end opened. The stator 23 is the field winding 23a.
A stator core 23b provided with is fixed to the housing 21, and an armature 24 is connected to an armature core 24c provided with an armature winding 24b fitted to a rotating shaft 24a and the armature winding 24b. The commutator 24d to the bearing 25,
It is rotatably supported by 26. Brush holder 27 fixed to the outer peripheral wall of the housing 21 with screws.
The carbon brush 28 housed in is urged by a spring or the like to come into contact with the outer peripheral surface of the commutator 24d to supply electric power. The airflow generated by the blower section is generated by the end bracket 22.
It is guided to the inside of the electric motor portion through the wind window formed in the above, and is cooled by being made to flow through the inside of the electric motor portion, and then discharged to the outside from the exhaust hole 21a formed in the outer peripheral wall of the housing 21.

The blower unit 30 includes the end bracket 2
2, a stator guide vane 31 screwed onto the end bracket 22, a centrifugal fan 33 fixed by a screw 32 to the end bracket 22 and the rotary shaft 24a extending through the stator guide vane 31, and the end bracket 22. The fixed guide vanes 31 and the centrifugal fan 3 press-fitted and fixed to the outer periphery of the
3, a fan casing 34 attached so as to cover 3.

The means for improving the efficiency of the electric blower will be described below.

The total efficiency ηo of the electric blower is expressed by the following equation, where motor efficiency ηm and fan efficiency ηf are given.

Ηo = ηm × ηf (1) In order to improve efficiency, it is necessary to improve motor efficiency and fan efficiency.

FIG. 2 is a diagram showing a motor efficiency ηm and a fan efficiency ηf with respect to a rotation speed of an electric blower for an electric vacuum cleaner, and a total efficiency ηo of the electric blower which is a product of both.

Here, the motor efficiency ηm measures the electric power Pi applied between the motor terminals with a single-phase power meter, and the motor shaft output Po measures the torque at that time by applying a load with a load device via a torque meter. Then, it is obtained by the following equation.

Ηm = (Po / Pi) × 100 (%) (2) Further, the fan efficiency ηf is calculated from the aerodynamic characteristics showing the relationship between the fan output Pf of the fan 14 and the air pressure and the air volume accompanying the rotation of the centrifugal fan. It is calculated by the following formula.

Ηf = (Pf / Po) × 100 (%) (3) Increasing the speed of the electric blower tends to increase mechanical loss and decrease efficiency. This is carbon brush 28 and commutator 24d
If the friction loss due to the mechanical sliding contact between the cores and the magnetic flux density of the armature and the stator core are maintained at the same value, the frequency of the magnetic flux change determined by the number of poles in the core and the rotation speed increases. This is the effect of increasing iron loss.

On the other hand, the fan efficiency ηf is set so that the outer diameter Df of the centrifugal fan 33 is reduced as the rotation speed increases. As a result, the diameter of the centrifugal fan becomes smaller as the centrifugal fan rotates at a higher speed, so that fluid loss, which is one of the factors of fan loss, can be reduced and fan efficiency can be improved.

Therefore, since the total efficiency η o of the electric blower is the product of the motor efficiency and the fan efficiency, the range in which the total efficiency becomes large is 40,000 to 50000 (r
pm).

However, in order to realize the range in which the overall efficiency is improved, the size of each part of the motor and the fan size cannot be realized unless they are set to predetermined sizes.

The present invention proposes the size of each part of the motor and the fan size that can achieve the overall efficiency of 50% or more.

That is, in FIG. 2, it is found that when the rotation speed of the electric blower is set in the range of 40,000 to 50,000 (rpm), the fan diameter must be set in the range of Φ95 (mm) to Φ75 (mm). ing.

For example, when the input is about 1000 (W), the rotation speed of the electric blower is 4 when the air volume is about 1.0 (m ³ / min).
In order to make the total efficiency of the electric blower 50% or more with the setting of 0000 (rpm), set the fan diameter to Φ95 (mm) and set the motor rotation speed to 50000 (rpm). This means that the fan diameter must be Φ75 (mm) in order to increase the efficiency to 50 (%) or more.

FIG. 3 shows the relationship between the armature core product thickness of the armature 24 and the average reactance voltage with respect to the rotation speed of the electric blower. In this figure, the total number of conductors in the armature winding is used as a parameter.

In FIG. 3, the total efficiency of the electric blower is 5
In order to maintain 0% or more, it is necessary to set the rotation speed of the electric blower to a value between 40,000 and 50,000 (rpm). Then, it becomes important to select the total number of conductor pairs which depends on the product thickness of the armature core 24c and the number of turns of the armature winding 24b. That is, if the total number of conductors is small, the laminated thickness of the armature iron core 24c must be increased, and the rotation speed becomes 4000.
For an electric blower that rotates at a high speed of 0 (rpm) or more, the armature core 2
When the laminated thickness of 4c is 21 (mm) or more, vibration is likely to occur, which adversely affects noise generation and brush life.

Therefore, in order to reduce the product thickness of the armature core 24c constituting the armature 24 to 21 (mm) or less, the total number of conductors Z is Z with respect to the rotation speed of the electric blower of 40,000 (rpm). = 312 or more (broken line of a in the figure).

On the other hand, if the maximum value of the total number of conductors that can satisfy the brush life from the viewpoint of rectification is Z = 360, the stack thickness of the armature core 20 at this time is 18 (mm). . Further, when the rotation speed is 50000 (rpm), Z =
If the number is 360, it is possible to reduce the stack thickness of the armature core 20 to 15 (mm) or less. However, the rotation speed is 500
At 00 (rpm), the sliding characteristics of the brush deteriorate, so it is necessary to reduce the total number of conductors to 336 or less. In this state, the laminated thickness of the armature core 20 can be 16 (mm).

From this, the rotation speed is set to 40,000 to 5,000.
When setting the value between 0 (rpm), the stack thickness of the armature core is determined from 21 (mm) to 16 (mm). From these results, the total number of conductors in the armature winding is 4 times the rotation speed of the electric blower.
With respect to 0000 (rpm), Z = 360 or less, and when the rotation speed is 50000 (rpm), Z = 336 or less, or at least Z = 264. When the rotation speed of the electric blower is set to any value from 40,000 (rpm) to 50,000 (rpm), vibration, noise and brush life can be satisfied.

Further, in FIG. 3, when the average reactance voltage is large, sparks are easily generated from the brush and the brush life is shortened. Therefore, it is preferable to reduce the total number of conductors as much as possible.

Since copper loss in the armature winding becomes a problem for higher efficiency, the number of windings of the armature winding can be reduced in a high-speed motor. Therefore, the conductor wire diameter is Φ0.65.
(mm) or more.

FIG. 4 is a diagram showing the relationship between the rotational speed of the electric blower in the motor section of the electric blower and an example of the calculated values of the brush peripheral friction velocity and the brush friction loss, using the outer diameter Dc of the commutator 24d as a parameter. Is.

As shown in FIG. 2, the rotation speed of the electric blower is in the range of 40,000 to 50,000 (rpm) in which the efficiency of the electric blower can be increased to about 50 (%) or more, and the commutator strength and the brush In order to maintain sliding stability, it is necessary that the commutator has a peripheral speed of about 50 (m / s) or less (a line or less in the figure).

From the viewpoint of improving efficiency, it is necessary that the brush friction loss in this range is approximately 45 (W) or less (b line or less in the figure). Therefore, the rotation speed is 40000
When set to (rpm), the commutator outer diameter is Φ23 (m
m) and the rotation speed is set to 50,000 (rpm), the commutator outer diameter needs to be Φ18 (mm) or less.

The rotation speed is from 40,000 to 5,000.
If set in the range of 0 rpm, at least Φ23 (mm)
It is characterized by the following.

The size of the brush in the rotating direction (brush thickness) also has a great influence on the brush friction loss and rectification, and is therefore an important factor for improving efficiency. In particular, set the brush thickness dimension so that the value obtained by dividing the brush thickness by the commutator element pitch is 2.0 or less.

Further, in order to reduce the electric loss of the brush, the brush material and the pigtail are fixed with silver-plated copper powder, and at the same time, at least three side surfaces of the brush material are formed with plated surfaces. I am trying.

[0053]

As described above, according to the present invention, it is possible to realize an electric blower with an overall efficiency of 50 (%) or more, and to provide an electric vacuum cleaner having a large suction work rate.

Further, since the total efficiency of the electric blower can be increased, it is possible to realize energy saving without consuming more power than necessary.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of an electric blower for an electric vacuum cleaner showing an embodiment of the present invention.

FIG. 2 is a characteristic diagram showing a change in motor efficiency, a fan efficiency, a total efficiency of a motor and a fan, and a change in an outer diameter dimension of a high-efficiency fan corresponding to a rotation speed range of an electric blower specified by the present invention.

FIG. 3 is an explanatory diagram showing a relationship between an armature core product thickness and an average reactance, which corresponds to a rotation speed range of an electric blower specified by the present invention and shows an embodiment in which a total number of conductors is used as a parameter. is there.

FIG. 4 is an explanatory diagram showing a relationship between a commutator surface peripheral speed and a brush friction loss corresponding to a rotation speed range of an electric blower specified by the present invention.

FIG. 5 is an external perspective view of an electric vacuum cleaner according to an embodiment of the present invention.

FIG. 6 is a vertical sectional view of an electric vacuum cleaner according to an embodiment of the present invention.

[Explanation of symbols]

20 ... Motor part, 21 ... Housing, 22 ... End bracket, 23 ... Stator, 23a ... Field winding, 23b ... Stator core, 24 ... Armature, 24a ... Rotating shaft, 24b ... Armature winding, 24c ... armature core, 24d ... commutator, 2
5, 26 ... Bearing, 27 ... Brush holder, 28 ... Carbon brush, 30 ... Blower part, 31 ... Fixed guide blade, 32 ...
Screw, 33 ... Centrifugal fan, 34 ... Fan casing.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Fumio Jouraku 1-1-1, Higashitaga-cho, Hitachi-shi, Ibaraki Hitachi Ltd. Electric Appliances Division, Taga Headquarters, Hitachi Ltd. 1-1-1 Machi In the electrical equipment division, Hitachi, Ltd., Hitachi, Ltd. (72) Inventor, Kunio Miyashita 1-1-1, Higashitaga-cho, Hitachi, Hitachi, Ibaraki In the electrical equipment division, Hitachi, Ltd. (72) Inventor Koji Iwase 502, Jinritsu-cho, Tsuchiura-shi, Ibaraki Machinery Research Laboratory, Inc.

Claims (7)

[Claims] 1. A field winding of a stator and an armature winding of an armature are formed by a series circuit, and a mechanical connection between a brush and a commutator is provided between the field winding and the armature winding. A single-phase AC commutator motor, which is composed of circuits electrically connected in series via sliding contact, and in which the stator and the armature core are composed of laminated cores, and a single-phase AC commutator motor In an electric vacuum cleaner equipped with an electric blower composed of a centrifugal fan provided at a shaft end, a fixed guide vane, and a casing covering the centrifugal fan and the fixed guide vane, an air volume of approximately 1.0 (m ³ / min) When the rotation speed of the electric blower is set to 40000 (rpm), the fan diameter should be approximately φ95 (mm) or less, and the rotation speed of the electric blower should be 5
When set to 0000 (rpm), the fan diameter is approximately φ76 (m
m) A vacuum cleaner characterized by having the following: 2. A field winding of a stator and an armature winding of an armature are constituted by a series circuit, and a mechanical connection between a brush and a commutator is provided between the field winding and the armature winding. A single-phase AC commutator motor, which is composed of circuits electrically connected in series via sliding contact, and in which the stator and the armature core are composed of laminated cores, and a single-phase AC commutator motor An electric vacuum cleaner equipped with an electric blower configured by a centrifugal fan provided at a shaft end, a fixed guide vane, and a casing covering the centrifugal fan and the fixed guide vane, wherein the power consumption of the single-phase AC commutator motor is approximately 1000.
In (W), when the rotation speed of the electric blower is set to 40,000 (rpm) in the region where the air volume is approximately 1.0 (m ³ / min), the product thickness of the armature core and the stator core is 21 (mm) or less, and when the motor rotation speed is set to 50,000 (rpm), the product thickness of the armature core and the stator core is 16 (mm) or less. 3. A field winding of a stator and an armature winding of an armature are constituted by a series circuit, and a mechanical connection between a brush and a commutator is provided between the field winding and the armature winding. A single-phase AC commutator motor, which is composed of circuits electrically connected in series via sliding contact, and in which the stator and the armature core are composed of laminated cores, and a single-phase AC commutator motor In an electric vacuum cleaner equipped with an electric blower composed of a centrifugal fan provided at a shaft end, a fixed guide vane, and a casing covering the centrifugal fan and the fixed guide vane, the rotation speed of the electric blower is set to 40,000 (rpm). In this case, the total number of conductors in the armature winding is set to 312 or more, and when the rotation speed of the electric blower is set to 50000 (rpm), the total number of conductors in the armature winding is set to 264 or more. A characteristic vacuum cleaner. 4. A field winding of a stator and an armature winding of an armature are formed by a series circuit, and a mechanical connection between a brush and a commutator is provided between the field winding and the armature winding. A single-phase AC commutator motor, which is composed of circuits electrically connected in series via sliding contact, and in which the stator and the armature core are composed of laminated cores, and a single-phase AC commutator motor In an electric vacuum cleaner equipped with an electric blower composed of a centrifugal fan provided at a shaft end, a fixed guide vane, and a casing covering the centrifugal fan and the fixed guide vane, the rotation speed of the electric blower is set to 40,000 (rpm). In this case, the commutator outer diameter is set to φ23 (mm) or less, and when the rotation speed of the electric blower is 50,000 (rpm), it is set to φ18 (mm) or less. 5. A field winding of a stator and an armature winding of an armature are formed by a series circuit, and a mechanical connection between a brush and a commutator is provided between the field winding and the armature winding. A single-phase AC commutator motor, which is composed of circuits electrically connected in series via sliding contact, and in which the stator and the armature core are composed of laminated cores, and a single-phase AC commutator motor An electric vacuum cleaner equipped with an electric blower composed of a centrifugal fan provided at an end of a shaft, a fixed guide vane, and a casing covering the centrifugal fan and the fixed guide vane, wherein a rotation speed of the electric blower is 40,000 to 50,000 (rpm).
If set to, set the conductor wire diameter of the armature winding to φ0.65.
(mm) or more, and the conductor diameter of the field winding is set to φ1.1 (mm) or more to reduce the copper loss of the armature winding and the copper loss of the field winding. Vacuum cleaner. 6. A field winding of a stator and an armature winding of an armature are formed by a series circuit, and a mechanical connection between a brush and a commutator is provided between the field winding and the armature winding. A single-phase AC commutator motor, which is composed of circuits electrically connected in series via sliding contact, and in which the stator and the armature core are composed of laminated cores, and a single-phase AC commutator motor An electric vacuum cleaner equipped with an electric blower composed of a centrifugal fan provided at an end of a shaft, a fixed guide vane, and a casing covering the centrifugal fan and the fixed guide vane, wherein a rotation speed of the electric blower is 40,000 to 50,000 (rpm).
When set to, set the commutator outer diameter to φ23 (mm) or less,
The vacuum cleaner is characterized in that the brush dimension is set so that the segment covering obtained by dividing the brush thickness, which is the dimension in the sliding direction of the brush, by the commutator element pitch is set to 2.0 or less. 7. A field winding of a stator and an armature winding of an armature are formed by a series circuit, and a mechanical connection between a brush and a commutator is provided between the field winding and the armature winding. A single-phase AC commutator motor, which is composed of circuits electrically connected in series via sliding contact, and in which the stator and the armature core are composed of laminated cores, and a single-phase AC commutator motor An electric vacuum cleaner equipped with an electric blower comprising a centrifugal fan provided at an end of a shaft, a fixed guide vane, and a casing covering the centrifugal fan and the fixed guide vane, wherein the brush is made of silver-plated copper powder for connection between a brush and a pigtail. An electric vacuum cleaner which is fixed and has at least three side surfaces other than the sliding surface plated with copper.