JP2016149855A - Rotary electric machine and electric blower including the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotary electric machine capable of suppressing the influences from the reaction of the armature and reducing the weight of the iron core by improving the wiring workability while ensuring the dimensions of magnetic field slot opening, and to provide an electric blower.SOLUTION: The rotary electric machine includes: a pair of first side parts which has a salient pole therein; an iron core of a rectangle cylindrical shape which is constituted of a pair of second side parts connecting the end parts of the first side parts; a field magnet which is constituted of a magnetic field wiring wound on the salient poles; and an armature disposed among the salient poles. On an inner peripheral of the second side part, an inclination is formed, and the width in a generally central part of the second side part is adapted to be smaller than the width of the end part of the second side part at the upstream side in a rotation direction of the armature.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a rotating electrical machine such as a generator or an electric motor, and also relates to an electric blower that is mounted on a vacuum cleaner or the like and rotates by rotating the fan by the power of the electric motor.

  Usually, a commutator motor is employed in the motor part of the electric blower mounted on the vacuum cleaner. This commutator motor has a field formed by winding a coil in a core tube formed by laminating a plurality of thin steel plates, and an armature provided rotatably in the field.

  As shown in FIG. 4, the electric motor of the electric blower mounted on the conventional vacuum cleaner is provided with a salient pole 105 for winding the field winding 107 inside the field core 106. The salient pole 5 has a first side portion 116 extending on both sides, and has a rectangular frame shape from a pair of second side portions 117 orthogonal to the first side portion 16.

  Magnetic flux generated by current flowing through the field winding 107 passes through the salient poles 105 of the field core 106 so that the armature 104 rotates with respect to the field 103. The field magnet 103 including the field core 106 configured as described above is built in such a manner that each corner of the core is brought into close contact with the inner surface of the cylindrical frame 102.

  Conventionally, the width of the second side 117 of the field core 106 is constant at L0. Here, the armature magnetic flux generated by the current flowing through the armature winding flows so as to pass through the salient poles through the middle of the second side connecting the salient poles of the field core. In other words, the magnetic flux flow at the second side that connects between the salient poles of the field iron core is that the field magnetic flux generated when a current is passed through only the field winding is in a fixed direction, but only in the armature winding. The armature magnetic flux generated when the current is passed flows in the direction separated by 180 degrees in the middle of the second side portion of the field core.

  For this reason, the amount of magnetic flux at the side of the field core that is generated when a current is passed through the entire motor is not uniform between the salient poles, and the amount of magnetic flux changes. The tendency of change in the amount of magnetic flux depends on the direction of rotation. However, the conventional field core has a uniform width dimension of the second side even if the amount of magnetic flux is not uniform.

  In recent years, there has been a demand for miniaturization of an electric blower due to the demand for small size and light weight of a vacuum cleaner. When the iron core shape is reduced in order to reduce the size of the electric motor, the average magnetic flux density of the iron core generally increases, and is easily affected by the armature reaction. The armature reaction has a problem that the performance of the electric motor is deteriorated in order to demagnetize the field magnetic flux or locally increase the magnetic flux density.

  Further, when the iron core shape is reduced in size, the size of the slot opening portion is also reduced, but the required size of the slot opening portion from the winding method is the same even if the iron core shape is reduced. Insulating paper is provided between the iron core and the winding, but the insulating paper in the slot opening needs to secure an insulating distance between the winding and the iron core. When the size of the slot opening is narrowed, there is a problem that a winding may enter between the insulating paper and the iron core, resulting in poor insulation.

  On the other hand, Patent Document 1 discloses that the pulsation torque is reduced by adjusting the gap gap width of the bias of the main magnetic flux flow caused by the armature magnetic flux generated by the current of the armature winding. By reducing the pulsation torque, the effect of reducing the mechanical vibration and improving the brush life can be obtained.

  Further, in Patent Document 2, the slot insulation member is displaced in the thickness direction of the field core due to vibration acting on the slot insulation member and the tension of the field winding, or becomes oblique with the winding work. It is disclosed that a winding defect is suppressed in such a manner that a field winding and a field iron core are in contact with each other and a predetermined withstand voltage cannot be secured.

  In Patent Document 3, the width of the slot opening between the tip of the salient pole of the field core and the side of the field core is increased by increasing the circumference of the arc that forms the outer diameter of the field core. The shape is shown.

Japanese Patent No. 5178307 JP 2010-57340 A JP 2013-13267 A

  However, in the configuration of Patent Document 1, since the weight of the field iron core is equal to that of the conventional one, there is no effect on the demand for lighter product. Furthermore, when the motor is downsized, the ratio of the magnetic resistance of the air gap is increased, and the performance of the motor is lowered.

  Further, in the configuration of Patent Document 2, the width of the slot opening between the tip of the salient pole of the field iron core and the side of the field core becomes narrow. Therefore, in a small electric motor, the tip of the salient pole and the slot insulating member There was a problem that windings were inserted between them and insulation defects were likely to occur.

  Further, the configuration of Patent Document 3 has a problem that the required amount of the iron core is increased and the cost is increased, and further, the weight is increased, so that the specification is not optimal for reducing the weight of the home appliance.

  The present invention has been made in view of the above problems of the conventional rotating electric machine, and an object of the present invention is to provide a rotating electric machine capable of realizing further reduction in size and weight while maintaining performance.

  In order to achieve the above object, a rotating electrical machine of the present invention has a rectangular cylindrical shape comprising a pair of first sides having salient poles on the inner surface and a pair of second sides connecting the ends of the first sides. A rotating electric machine comprising a magnetic core, a field composed of a field winding wound around a salient pole, and an armature disposed between the salient poles, wherein the inner peripheral side of the second side portion is inclined. The width of the substantially central part of the second side part is made smaller than the width of the end part of the second side part.

  By adopting such a structure of the iron core, the dimensions of the armature and the sides of the iron core become larger than before, and the armature magnetic flux can be suppressed. Furthermore, since the width of the slot opening between the tip of the salient pole of the iron core and the side of the iron core is increased, it is possible to suppress insulation failure in which a winding enters between the tip of the salient pole and the slot insulating member. Even if it is a field iron core, winding workability can be secured. Accordingly, it is possible to obtain a rotating electrical machine that is further reduced in size and weight.

  ADVANTAGE OF THE INVENTION According to this invention, even if it is a small field iron core, the dimension of a slot opening part can be ensured, winding workability | operativity can be ensured, and a small and lightweight rotary electric machine can be provided.

The half sectional view of the electric blower provided with the electric motor in Embodiment 1 of the present invention Sectional drawing of the iron core of the electric motor in Embodiment 1 of this invention Sectional drawing of the iron core of the electric motor in Embodiment 2 of this invention Sectional view of the iron core of a conventional motor

(Embodiment 1)
Hereinafter, the electric motor and electric blower of Embodiment 1 of the present invention will be described with reference to FIGS. As shown in FIG. 1, the electric blower 1 is provided with an electric motor 20 in a cylindrical frame 2 that is closed on one side and opened in the opposite direction. The electric motor 20 is generally composed of a field 3 and an armature 4. A bracket 8 and a fan case 9 are attached so as to cover the opened side of the frame 2.

  The rotating shaft 10 of the armature 4 protrudes from the bracket 8 and enters the fan case 9. A centrifugal fan 11 is attached to the tip of the rotating shaft 10, and a bracket 8 and an air guide 12 are attached between the centrifugal fan 11 and the opening of the frame 2 and are arranged in the fan case 9.

  Air sucked from the central opening of the fan case 9 and discharged from the centrifugal fan 11 is guided into the bracket 8 through the air guide 12, and mainly passes through a space formed between the field core 6 and the armature 4. So that it is discharged to the outside of the frame 2.

  FIG. 2 shows an AA cross section of FIG. The field magnet 3 has a pair of opposing salient poles 5 formed in a cylinder, and a field iron core 6 having a rectangular cylindrical shape formed by stacking a plurality of punched steel plates, and wound around the salient pole 5. And a field winding 7 to be rotated. The armature 4 is rotatably provided in the cylinder so as to be sandwiched between the salient poles 5.

  In the field magnet 3, the outer diameter 13 of the field core 6 is held in pressure contact with the inner diameter of the frame 2. An insulating paper 15 is provided in the slot 14 that houses the field winding 7 wound around the salient pole 5 of the field iron core 6.

  The field iron core 6 integrally connects between a pair of first side portions 16 having salient poles 5 on the inner surface and ends of the first side portions 16 located at both ends of the salient poles 5 in the first side portions 16. A square cylinder is formed by the pair of second side portions 17 provided at. And it is set as the structure which provided the inclination in the inner peripheral side of the 2nd side part 17 so that the width L2 of the substantially center part 19 may become small with respect to the width L1 of the edge part 18 of the 2nd side part 17. FIG.

  According to this embodiment, the following effects can be obtained. In other words, the magnetic circuit of the magnetic flux generated from the armature has a large magnetic resistance, so that the influence of the armature reaction can be suppressed. Further, since the width of the field slot opening can be increased, winding workability can be ensured even with a small iron core shape, and poor insulation can be suppressed. In addition, since the space between the field winding and the armature can be increased, the cooling air in the vicinity of the winding can be increased to suppress the increase in the winding temperature and further suppress the windage loss. it can. Moreover, since the weight of a field iron core can be suppressed, a product can be made light.

(Embodiment 2)
A second embodiment is shown in FIG. A substantially central portion 19 with respect to the width L1 of the upstream end portion 18a of the second side portion 17, which is an end portion located on the upstream side (upper side in the drawing) of the rotation direction of the armature 4 (arrow direction in the drawing). An inclination is provided on the inner peripheral side of the second side portion 17 so that the width L2 of the second side portion 17 becomes smaller. The width L3 of the downstream end 18b of the side 17 is substantially the same.

  This is because the change in the amount of magnetic flux in the second side portion 17 is small compared to the upstream side in the rotation direction, but if the slot shape difference between the rotation direction and the opposite direction is reduced, the position of the insulating paper 15 in the slot 14 is stabilized. The effect of doing is obtained.

  Note that the number of poles of the field 3 is not limited to two but may be an even number of two or more, and the field core may be polygonal in accordance with the number of poles.

  According to the rotating electrical machine of the present invention, the size of the slot opening can be ensured even with a small field iron core, and winding workability can be ensured. It can be widely applied to various electric devices such as a blower.

DESCRIPTION OF SYMBOLS 1 Electric blower 2 Frame 3 Field 4 Armature 5 Salient pole 6 Field iron core 7 Field winding 14 Slot 15 Insulating paper 16 1st edge part 17 2nd edge part 18 End part 19 Central part

Claims (3)

A rectangular cylindrical iron core composed of a pair of first sides having salient poles on the inner surface, and a pair of second sides connecting the ends of the first sides, and a field wound around the salient poles A field consisting of windings;
A rotating electric machine having an armature disposed between the salient poles,
A rotating electrical machine characterized in that an inclination is provided on an inner peripheral side of the second side portion so that a width of a substantially central portion of the second side portion is smaller than a width of an end portion of the second side portion. A rectangular cylindrical iron core composed of a pair of first sides having salient poles on the inner surface, and a pair of second sides connecting the ends of the first sides, and a field wound around the salient poles A field consisting of windings;
A rotating electric machine having an armature disposed between the salient poles,
An inclination is provided on the inner peripheral side of the second side portion so that the width of the substantially central portion of the second side portion is smaller than the width of the end portion of the second side portion on the upstream side in the rotation direction of the armature. ,
The rotating electrical machine characterized in that the width of the end portion of the second side portion on the downstream side in the other rotation direction is equal to the width of the substantially central portion of the second side portion. An electric blower comprising the rotating electric machine according to claim 1 or 2.

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