JP5369557B2 - Electric blower - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electric motor which can improve a cooling effect of a winding temperature by improving air blowing efficiency by making a suction wind pass into an electric motor, and can prevent an increase of noise. <P>SOLUTION: A magnetic field core 1 is inserted into a casing of the motor, and press-fixed to a magnetic field core press-insertion part 30 which is located in the middle of the side of a square shape of the internal face of a load-side bracket 3 which is formed into a square shape by using four external peripheral ends 11 of the magnetic field core 1. A rotating shaft 9 of an armature 2 is fixed by an anti-load side bracket 4 and an end terminal bracket 15 via bearings 7, 8. By this, exhaustion ports 20 larger in area than a conventional substantially fan-shaped space 10 are formed at four corners of the load-side bracket 3 and the magnetic field core 1. As a result, an exhaustion wind passage at a portion into which the magnetic field core 1 of the load-side bracket 3 is embedded can largely be expanded. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to an electric blower provided in an electric vacuum cleaner or the like, and more particularly to an electric blower in which suction air is passed through the electric motor to improve the air blowing efficiency.

  A conventional electric motor part from which an air blower part is removed in an electric blower generally used for a vacuum cleaner or the like is shown in FIGS. FIG. 12 is a side perspective view of the electric motor unit, and FIG. 13 is a state diagram of the field core insertion.

In the figure, the stator is configured by applying a field winding to a field core 1. The armature 2 formed by armature winding on the armature core passed through the rotation shaft 9 is rotatably fixed by bearings 7 and 8 provided at both ends of the rotation shaft 9 in which the commutator is coaxially arranged. And constitutes a rotor. A front end bracket (not shown), a load side bracket 3 and an anti-load side bracket 4 are formed at both ends of a frame 5 in which a relatively thick iron plate is molded into a bottomed cylindrical shape. ing. A terminal bracket, a load side bracket 3, a rear anti-load side bracket 4 and a frame 5 connecting these brackets constitute a casing of the electric motor part.
A load side bracket 3 and an anti-load side bracket 4 are formed. The load side bracket 3, the anti-load side bracket 4 and the frame 5 form a casing.

  The stator field core 1 is press-fitted and fixed to the inner surface of the load-side bracket 3 at each outer peripheral end 11 of the field core 1, and the rotor is fixed to the anti-load-side bracket 4. A ventilation hole 14 and a brush hole 12 are formed in the frame 5, and a pair of carbon brushes (not shown) are fixed to the brush hole 12 with screws through a brush holder to form an electric motor part. The flange 6 of the load side bracket 3 is attached with a blower (not shown) composed of a centrifugal fan connected to the rotary shaft 9.

  The casing shape which consists of a bracket and a frame of such an electric blower is comprised by the cylindrical shape. Although the field core 1 is built in the load-side bracket 3, when the load-side bracket 3 is cylindrical, the space through which the exhaust air flows is substantially formed between each side outside the core and the core outer circumference circle. There are only four fan-shaped spaces 10 having a fan-shaped area. Therefore, since the exhaust surface property at this portion is the narrowest setting, there has been a problem that the exhaust efficiency of the motor is lowered due to excessive exhaust pressure and the cooling effect of the winding temperature is hindered. In addition, since this portion becomes a bottleneck, an increase in wind noise has been invited.

  In order to improve the cooling effect of the winding temperature of the electric blower, it has a winding frame attached to the end face of the field core and a field winding wound around the field core and the winding frame. A ventilation cross section is formed between the field iron core and the motor frame to provide an outer peripheral portion of the field winding between the coil end between the field winding slots and the field iron core. By providing the reel with a wall surface that narrows the width of the coil, it flows along the motor frame from the gap between the wall surface of the reel frame and the motor frame arranged on the end surface of the field core, and then the wall surface of the reel frame on the anti-fan side The coil flow between the slot of the field winding induced by the first flow that is induced toward the field winding and cools the winding, and the wall surface protruding to the outer peripheral side of the field winding of the reel. 2nd which cools a field winding and an armature winding through the space which can be ventilated formed between magnetic iron cores Flow occurs, each which temperature rise without reducing the blowing efficiency with high winding cooling of flow is improved have been proposed (e.g., see Patent Document 1).

  Further, in the electric blower, a stator having a winding and a rotor that rotates at high speed, a motor that covers them with a bracket, a centrifugal fan that is fixed to the shaft of the rotor and rotates together, and a plurality of centrifugal fans on the outer periphery of the centrifugal fan An air guide having a diffuser portion formed by adjacent stationary blades and a fan case press-fitted and fixed to the bracket so as to cover the centrifugal fan, and cooling the motor by an air flow generated by the centrifugal fan In the electric blower of the present invention, the outer peripheral portion of the fan case includes an opening that discharges a part of the air that has passed through the diffuser portion to the outside, and a flange-like convex portion that covers a part of the opening, It is also known that the air volume for cooling the air volume and the air volume discharged from the outer periphery of the fan case can be distributed in a balanced manner (see, for example, Patent Document 2).

Further, in the electric blower, an opening wall that is substantially parallel to the outer peripheral surface of the motor frame is provided in the flange portion, and a plurality of discharge ports facing the motor frame are opened in the opening wall, and the centrifugal blower is provided. It is also known that exhaust air discharged from a fan is discharged from these discharge ports, and the cooling effect of the electric part can be enhanced by an air flow that flows out of the fan and is discharged without passing through the motor frame. (For example, refer to Patent Document 3).
JP 2004-343914 A JP 2006-132369 A JP 2006-104976 A

  Thus, the casing shape which consists of the bracket and frame of the conventional electric blower is comprised by the cylindrical shape. Although the field core is built in the bracket, when the bracket is cylindrical, there is a space in which exhaust air flows only in an approximately fan-shaped area formed between each side of the core outer side and the core outer circumference circle. Therefore, since the exhaust surface property at this portion is the narrowest setting, there is a problem that the air blowing efficiency of the motor is lowered due to excessive exhaust pressure. In addition, since this portion becomes a bottleneck, an increase in wind noise has been invited. Therefore, the present invention can greatly expand the exhaust air passage of the portion where the field core of the bracket is built, and this portion does not become a bottleneck, but improves the blowing efficiency by passing the suction air into the motor. An electric blower capable of improving the cooling effect of the winding temperature and preventing an increase in noise is provided.

In order to solve the above-described problem, an electric blower according to claim 1 of the present invention is an electric blower including a blower unit and a motor unit provided with a blower fan, and a casing of the motor unit is a front part facing the blower unit side. It consists of a terminal bracket, a load side bracket, a rear anti-load side bracket, and a frame connecting these brackets. The motor part has an armature as a rotor and a field core as a stator. The armature is supported by an anti-load side bracket and a terminal bracket so that the stator and rotor are built in the casing, and the outer circumference of each of the field cores is fixed to the inner surface of the load side bracket. field core press-fit portion of the load-side bracket end is pressed together with an intermediate portion of each side of the rectangle of the load-side bracket, the anti-load side bracket Bearing internal side end, about the rotation axis a circular, constituting the frame so the inclined shape between square portion of the field core press-fit portion of the load-side bracket and the bearing internal end configuration It was.

  In this way, exhaust ports are formed at the four corners of the load-side bracket and the field core, so that the exhaust air passage in the portion where the field core of the load-side bracket is built can be greatly expanded. Temperature rise can be prevented. Moreover, since this part does not become a bottleneck, an increase in noise can be prevented.

Moreover, the bearing built-in side end of the bracket is concentric with the rotating shaft, and it is possible to prevent distortion due to the square side of the field core press-fitting part from deteriorating the roundness when the bearing is attached. In addition, when the frame is cylindrical, the brush mounting position is far from the rotation axis, so that the brush mounting varies, and the input variation due to the change in the brush position is likely to occur. However, the input variation according to the embodiment of the present invention. Can be reduced .

The electric blower according to claim 2 of the present invention is an electric blower comprising a blower unit and a motor unit provided with a blower fan, wherein the casing of the motor unit has a front end bracket, a load side bracket, and a rear part facing the blower unit side. The anti-load side bracket and a frame connecting these brackets, the motor part has an armature as a rotor and a field core as a stator, and the field core is a load side bracket formed in a square shape. The load-side bracket is press-fitted and fixed to the inner surface, and the armature is supported by an anti-load-side bracket and a terminal bracket so that the stator and the rotor are built into the casing, and the outer peripheral ends of the field cores are pressed against each other. The field core press-in portion is an intermediate portion of each side of the square of the load-side bracket, and the field core press-in portion of the load-side bracket is each of the field core And configured to have a bead portion of the R shape corresponding to the peripheral edge shape.

  Thus, since the field core press-fitting portion of the load side bracket is concentric with the outer peripheral end of the field core, the field core can be rotated with respect to the rotation axis, so the angle of the field core can be arbitrarily changed, The electrical angle with the armature can be set arbitrarily, and input adjustment and performance adjustment can be easily performed. In addition, since a bead is added to a flat portion (side portion) that is weak in strength, it contributes to an increase in strength of the flat portion, and vibration can be reduced.

The electric blower according to claim 3 of the present invention is an electric blower comprising a blower unit and a motor unit provided with a blower fan, wherein the casing of the motor unit has a front end bracket, a load side bracket and a rear part facing the blower unit side. The anti-load side bracket and a frame connecting these brackets, the motor part has an armature as a rotor and a field core as a stator, and the field core is a load side bracket formed in a square shape. The load-side bracket is press-fitted and fixed to the inner surface, and the armature is supported by an anti-load-side bracket and a terminal bracket so that the stator and the rotor are built into the casing, and the outer peripheral ends of the field cores are pressed against each other. The field core press-fit portion is an intermediate portion of each side of the square of the load side bracket, and the bearing built-in side end portion of the anti-load side bracket is centered on the rotation axis. The frame between the bearing built-in side end and the quadrangular portion of the field core press-fitting portion of the load side bracket is smoothly inclined, and the brush mounting portion provided on the frame is a rotating shaft method. The configuration has a plane perpendicular to the line.

  In this way, the screw seat of the brush mounting screw, which is the brush mounting portion, is a plane perpendicular to the normal line of the rotation axis, so that the screw seat, which is the brush mounting portion, is a plane parallel to the rotation axis, and is stable. You can attach a brush. Further, since management is performed on a flat surface, the management is easy, and variations in input can be reduced due to fluctuations in the brush position.

  As described above, in the electric blower of the present invention, exhaust ports are formed at the four corners of the load-side bracket and the field core, so that the exhaust air path in the portion where the field core of the load-side bracket is built is greatly increased. Can be expanded. In addition, the exhaust pressure is reduced because a part of the wind that has cooled the field core is forced again in the axial direction can be discharged to the outside of the casing through the newly formed exhaust port without bending the air path. Therefore, it is possible to increase the air blowing efficiency and prevent the temperature from rising. Moreover, since this part does not become a bottleneck, an increase in noise can be prevented.

  In addition, the anti-load side bracket has a square shape, the brush connection part on the frame side is flat, and parallel to the brush attachment part on the opposite side, so the brush attachment angle is stable and management is easy. In addition, it is possible to stabilize input and reduce sparks by reducing variation in brush position. And since it becomes a structure which makes a hole in a plane part also on manufacture, not only the mold structure becomes simple, but also the wear / breakage of the mold can be reduced and the mold cost / mold repair cost can be reduced.

  Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a first embodiment of the present invention. FIG. 2 is an assembly view of an electric motor part constituting an electric blower, FIG. 2 is a side perspective view of the electric motor part, and FIG. FIG. 4 is a partial modification of the first embodiment of the present invention, and is a side perspective view of an electric motor unit, and FIG. 5 is a state diagram of a field core inserted.

  Next, a first embodiment of the present invention will be described with reference to FIG. 1, FIG. 2, and FIG. In the figure, the same components as those in FIGS. 12 and 13 are denoted by the same reference numerals. The stator is configured by applying field windings to the field core 1. The armature 2 formed by armature winding on the armature core passed through the rotation shaft 9 is rotatably fixed by bearings 7 and 8 provided at both ends of the rotation shaft 9 in which the commutator is coaxially arranged. And constitutes a rotor. A front end bracket 15, a load-side bracket 3, and an anti-load-side bracket 4 are formed at both ends of a frame 5 in which a relatively thick steel plate is molded. The terminal bracket 15, the load side bracket 3, the rear anti-load side bracket 4 and the frame 5 connecting these brackets constitute a casing of the motor part.

  An exhaust port 14 and a brush mounting hole 12 are formed in the frame 5, and a pair of carbon brushes (not shown) are fixed to the brush mounting hole 12 with a brush mounting screw 13 through a brush retainer, so that the electric motor portion is fixed. Forming. The flange 6 of the load side bracket 3 is attached with a blower (not shown) composed of a centrifugal fan connected to the rotary shaft 9.

  As shown in FIGS. 2 and 3, the load side bracket 3 is not formed in a cylindrical shape but is formed in a quadrangular shape. The end portion on the bearing-inside side of the anti-load side bracket 4 has a circular shape centering on the rotating shaft 9, and the frame between this end portion on the side in which the bearing is built-in and the rectangular portion of the field core press-fit portion 30 of the load-side bracket 3 5 is smoothly inclined and configured.

  As shown in the assembly diagram of the electric motor unit in FIG. 1, the field core 1 is inserted into the field core press-fitting portion 30 located in the middle of the square side of the inner surface of the load-side bracket 3 formed in a square shape. The field core 1 is press-fitted and fixed at the four outer peripheral ends 11. The rotating shaft 9 of the armature 2 is fixed to the anti-load side bracket 4 and the end bracket 15 via bearings 7 and 8. As a result, exhaust ports 20 having a larger area than the conventional substantially fan-shaped space 10 are formed at the four corners of the load side bracket 3 and the field core 1.

  As a result, since the exhaust ports 20 are formed at the four corners of the load side bracket 3 and the field core 1, the exhaust air passage in the portion of the load side bracket 3 in which the field core 1 is built can be greatly expanded. The ventilation efficiency can be increased and temperature rise can be prevented. Moreover, since this part does not become a bottleneck, an increase in noise can be prevented.

  Moreover, the bearing built-in side end of the anti-load side bracket 4 has a circular shape centering on the rotating shaft 9, so that the bearing built-in side end of the bracket 4 is concentric with the rotating shaft 9, and the field core portion. It can prevent that the distortion by the side of the press-fit part 11 being a square deteriorates the roundness at the time of attaching a bearing.

In addition, when the frame is cylindrical, the brush mounting position is far from the rotation shaft 9, so the brush mounting varies, and the input variation due to the brush position change is likely to occur . The frame 5 between the bearing built-in side end portion of the anti-load side bracket 4 and the rectangular portion of the field core press-fitting portion 30 of the load side bracket 3 is smoothly inclined to form a brush as compared with a cylindrical frame. Since the attachment position can be brought closer to the rotary shaft 9, variations in brush attachment can be suppressed, and input variations can be reduced.

  Next, an example in which the first embodiment of the present invention is partially modified will be described with reference to FIGS. 4 is a side perspective view of the electric motor unit, and FIG. 5 is a state diagram of the field core insertion. 4 and 5 are substantially the same as those described with reference to FIGS. 1, 2, and 3, and therefore, the same reference numerals are given and description thereof is omitted, and only different points will be described.

  An R-shaped bead portion 31 corresponding to the shape of each outer peripheral end 11 of the field core 1 is formed in the field core press-fit portion 30 of the load side bracket 3. As a result, the field core press-fitting portion 30 of the load side bracket 3 is concentric with the outer peripheral end 11 of the field core 1, so that the field core 1 can be rotated with respect to the rotating shaft 9, so that the field can be arbitrarily selected. The angle of the core can be changed, and the electrical angle with the armature can be set arbitrarily, and input adjustment and performance adjustment can be easily performed. In addition, since a bead is added to a flat portion (side portion) that is weak in strength, it contributes to an increase in strength of the flat portion, and vibration can be reduced.

  Further, a brush mounting hole 12 is formed in the frame 5, and a motor part is formed by fixing a pair of carbon brushes (not shown) to the brush mounting hole 12 with a brush mounting screw 13 via a brush holder. Yes. Since the screw seat of the brush mounting screw 13 is a plane perpendicular to the normal line of the rotating shaft 16, the screw seat as the brush mounting portion is a parallel plane to the rotating shaft 9, so that the brush can be mounted stably. be able to. Further, since management is performed on a flat surface, the management is easy, and variations in input can be reduced due to fluctuations in the brush position.

  Next, 2nd Embodiment of the electric motor part which comprises the electric blower of this invention is described. 6 is an assembly diagram of an electric motor part constituting the electric blower, FIG. 7 is an assembled view of the electric motor part, FIG. 8 is a side perspective view of the electric motor part, FIG. 9 is a side view of the electric motor part, and FIG. FIG. FIG. 11 is a state diagram of the field core insertion.

  The second embodiment of the electric motor part constituting the electric blower of the present invention has the same basic configuration as that of the first embodiment described with reference to FIGS. 1 to 5 except that the anti-load side bracket is a square. It is greatly different in that it has a shape and is shifted from the load side bracket by approximately 45 degrees.

  Next, a second embodiment of the present invention shown in FIGS. 6 to 11 will be described. In the figure, the same components as those in FIGS. 1 to 5 are denoted by the same reference numerals. The stator is configured by applying field windings to the field core 1. The armature 2 formed by armature winding on the armature core passed through the rotation shaft 9 is rotatably fixed by bearings 7 and 8 provided at both ends of the rotation shaft 9 in which the commutator is coaxially arranged. And constitutes a rotor. A front end bracket 15, a load-side bracket 3, and an anti-load-side bracket 4 are formed at both ends of a frame 5 in which a relatively thick steel plate is molded. The terminal bracket 15, the load side bracket 3, the rear anti-load side bracket 4 and the frame 5 connecting these brackets constitute a casing of the motor part.

  As shown in FIG. 8, a ventilation hole 14 and a brush attachment hole 12 are formed in the frame 5 on the side surface of the anti-load side bracket 40, and a pair of carbon brushes (not shown) is attached to the brush attachment hole 12 with a brush holder. Thus, an electric motor part is formed by fixing with mounting screws 13 arranged in a direction shifted laterally from the rotation shaft. The flange 6 of the load side bracket 3 is attached with a blower (not shown) composed of a centrifugal fan connected to the rotary shaft 9.

  As shown in FIGS. 6-8, the load side bracket 3 is formed in square shape instead of cylindrical shape. Further, this is a feature of the second embodiment of the present invention. The anti-load side bracket 40 is formed in a quadrangular shape and is disposed so as to be shifted from the square-shaped load side bracket 3 by about 45 degrees.

  As shown in the assembly diagram of the electric motor part in FIG. 6, the field core 1 is placed in the field core press-fitting part located at the middle part of the rectangular side of the inner surface of the load-side bracket 3 formed in a rectangular shape. The magnetic core 1 is press-fitted and fixed at the four outer peripheral ends. The rotating shaft 9 of the armature 2 is fixed to the anti-load side bracket 4 and the end bracket 15 via bearings 7 and 8. As a result, the assembled motor part as shown in FIG. 7 is completed. As a result, as shown in FIGS. 7 and 11, exhaust ports 20 having large areas are formed at the four corners of the load side bracket 3 and the field core 1.

  And since the exhaust port 20 is formed in the four corners of the load side bracket 3 and the field core 1, the exhaust air path of the portion of the load side bracket 3 in which the field core 1 is built can be greatly expanded. The ventilation efficiency can be increased to prevent temperature rise, and since this portion does not become a bottleneck, an increase in noise can be prevented.

  In addition, since the brush connection part is flat and parallel to the opposite brush attachment part, the brush attachment angle is stable and management is easy, so the input is stabilized by reducing variations in the brush position. And can reduce sparks. Further, since the structure is such that a hole is made in the flat portion, not only the mold structure is simplified, but also the wear / breakage of the mold can be reduced, and the mold cost / mold repair cost can be reduced.

  As shown in FIGS. 8 and 9, a brush holder mounting hole 12 is provided on the side of the rectangular frame 5 of the anti-load side bracket 40, and the mounting screw 13 of the brush holder is moved laterally from the rotation axis. Arrange them in the shifted direction. As a result, the screw mounting portion 12 of the brush can also be arranged on the plane portion and can be screwed in the vicinity of the brush position, so that the variation in the brush position can be reduced, and the input can be further stabilized and the spark reduced.

  As shown in FIGS. 10 and 11, an R-shaped bead portion 31 corresponding to the shape of each outer peripheral end 11 of the field core 1 is formed in the field core press-fit portion 30 of the load side bracket 3. As a result, the field core press-fitting portion 30 of the load side bracket 3 is concentric with the outer peripheral end 11 of the field core 1, so that the field core 1 can be rotated with respect to the rotating shaft 9, so that the field can be arbitrarily selected. The angle of the core can be changed, and the electrical angle with the armature can be set arbitrarily, and input adjustment and performance adjustment can be easily performed. In addition, since a bead is added to a flat portion (side portion) that is weak in strength, it contributes to an increase in strength of the flat portion, and vibration can be reduced.

  As shown in FIG. 8, the anti-load side bracket 40 has a quadrangular shape shifted by approximately 45 degrees from the load side bracket 3, so that a square corner portion on the field core press-fitting portion side of the load side bracket 3, An exhaust hole portion 17 for flowing exhaust gas can be formed in a substantially triangular portion formed by the side portion of the rectangular frame 5 of the anti-load side bracket 40 that is shifted by 45 degrees. Thereby, since the wind which cooled the field core 1 can be partly discharged outside the casing without being bent in the axial direction, the air flow can be improved by reducing the exhaust pressure.

  Further, as shown in FIGS. 8 and 9, the exhaust holes 16 can be newly formed at the corners of the rectangular frame 5 of the anti-load side bracket 40. Thereby, since an open part is made in the corner part of the field core, not only the exhaust function but also a connection part such as a tab terminal can be arranged in this part. In addition, since the commutation terminal side of the commutator and the brush is opened, it is easy to check the occurrence of sparks, and at the time of sparking, a comiston can be applied from this part, from a position shifted from the center on the rotation direction side. Since it is possible to apply a comiston, the commutator can be treated more smoothly without applying a load. As a result, the motor can be adjusted to a more stable motor.

  As described above, in the electric blower of the present invention, exhaust ports are formed at the four corners of the load-side bracket and the field core, so that the exhaust air path in the portion where the field core of the load-side bracket is built is greatly increased. Can be expanded. In addition, the exhaust pressure is reduced because a part of the wind that has cooled the field core is forced again in the axial direction can be discharged to the outside of the casing through the newly formed exhaust port without bending the air path. Therefore, it is possible to increase the air blowing efficiency and prevent the temperature from rising. Moreover, since this part does not become a bottleneck, an increase in noise can be prevented.

  In addition, since the field core press-fit portion of the load side bracket is concentric with the outer peripheral end of the field core, the field core can be rotated with respect to the rotation axis, so the angle of the field core can be arbitrarily changed, The electrical angle with the armature can be set arbitrarily, and input adjustment and performance adjustment can be easily performed. In addition, since a bead is added to a flat portion (side portion) that is weak in strength, it contributes to an increase in strength of the flat portion, and vibration can be reduced.

  In addition, the anti-load side bracket has a square shape, the brush connection part on the frame side is flat, and parallel to the brush attachment part on the opposite side, so the brush attachment angle is stable and management is easy. In addition, it is possible to stabilize input and reduce sparks by reducing variation in brush position. And since it becomes a structure which makes a hole in a plane part also on manufacture, not only the mold structure becomes simple, but also the wear / breakage of the mold can be reduced and the mold cost / mold repair cost can be reduced.

The assembly drawing of the electric motor part which comprises the electric blower of the 1st embodiment of this invention. The side perspective view of an electric motor part. Field core insertion state diagram. The side perspective view of another electric motor part. Field core insertion state diagram. The assembly drawing of the electric motor part which comprises the electric blower of the 2nd embodiment of this invention. The assembly completion figure of an electric motor part. The side perspective view of an electric motor part. The side view of an electric motor part. The state figure before field core insertion. Field core insertion state diagram. The side perspective view of the conventional motive part. The conventional field core insertion state figure.

Explanation of symbols

1 Field core 2 Rotating shaft 3 Load side bracket 4 Anti-load side bracket (circular)
5 Frame 6 Flange 7, 8 Bearing 9 Rotating shaft 10 Substantially fan-shaped space 11 Field core outer peripheral end 12 Brush mounting hole 13 Brush mounting screw 14 Exhaust port 15 Terminal bracket 16 Exhaust port 20 Exhaust port 30 Field core press-fit portion 31 R shape Bead part 40 Anti-load side bracket (square)

Claims (3)

In an electric blower comprising a blower section and an electric motor section provided with a blower fan, the casing of the electric motor section includes a front end bracket and a load side bracket opposed to the blower section side, a rear anti-load side bracket, and a frame connecting these brackets. The motor part has an armature as a rotor and a field core as a stator, the field core is press-fitted and fixed to the inner surface of a load side bracket formed in a square shape, and the armature is on the anti-load side The stator and the rotor are built in the casing by supporting the bracket and the terminal bracket, and the field core press-fitting portion of the load side bracket where the outer peripheral ends of the field cores are in pressure contact with each other is the load side bracket. with an intermediate portion of each side of the square, the bearing internal end of the anti-load side bracket, about the rotation axis a circular, bearing internal An electric blower, characterized in that it constituted by inclined shape frame between the square portion of the field core press-fit portion between the end portion and the load-side bracket. 2. The electric blower according to claim 1, wherein the field core press-fitting portion of the load side bracket has an R-shaped bead portion corresponding to each outer peripheral end shape of the field core. Brush mounting portion provided on the frame, the electric blower according to claim 1, wherein a plane perpendicular to the rotational axis normal.

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