JP5494532B2 - Rotating electric machine, electric blower and equipment - Google Patents

Description

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

  Usually, a commutator motor is adopted for the motor part of the electric blower mounted on the vacuum cleaner. The field of this electric motor is configured by winding a coil in a cylinder of a square cylindrical iron core. The armature is rotatably provided in the cylinder. The iron core is formed by laminating a plurality of steel plates, and this steel plate is manufactured by punching a rolled non-oriented electrical steel sheet.

  FIG. 5 is a partial cross-sectional view showing a configuration of a conventional electric blower, FIG. 6 is a partial cross-sectional view showing a state in which a field is press-fitted into a bracket of a conventional electric blower, and FIG. 7 shows a conventional field iron core. FIG. 8 and FIG. 8 are process diagrams showing conventional iron core punching. For example, as shown in FIG. 7, each steel plate has a rectangular frame shape with a pair of side portions 101 formed in the rolling direction of the steel plate and a pair of side portions 102 orthogonal to the side portions. A salient pole portion 103 for winding a field winding is provided inside one side portion.

  Magnetic flux generated by current flowing through the field winding passes through the sides of the iron core, and the armature rotates with respect to the field. If there is a narrow portion in a part of this side portion, the magnetic flux density in that portion is particularly high and magnetic saturation is likely to occur. For this reason, conventionally, the width of the side portion is designed to be the same, and it is considered that local magnetic saturation does not occur in the magnetic circuit.

  As shown in FIGS. 5 and 6, the field including the iron core 104 having such a structure incorporates each corner portion 105 of the iron core 104 in close contact with the inner surface of the cylindrical bracket 106, and is attached to the end of the rotating shaft 107. A fan 108 is attached. A fan case 109 provided so as to cover the fan 108 guides air blown from the fan 108 into the bracket 106 and blows air. In such ventilation, the airflow passing through the bracket 106 (wind passing through) passes through the gap between the outer surface of each frame side of the field iron core 104 and the inner surface of the cylindrical portion of the bracket 106 facing this surface. In addition, a gap between the outer surface of the armature 110 disposed between the salient poles inside the field iron core 104 is used as a flow path. (For example, refer to Patent Document 1).

JP-A-8-65979

  In the process of manufacturing a conventional electromagnetic steel sheet, the sheet is rolled to a width of about 1 meter, but the end perpendicular to the rolling direction, that is, the end in the hoop width direction is thinner than the normal thickness at the center in the hoop width direction. For this reason, the magnetic resistance of the iron core where the end of the hoop width is laminated becomes higher than the design value. This has been a cause of variations in the characteristics of electric motors. Therefore, as shown in FIG. 8, both ends in the hoop width direction (B direction) may be discarded without being used as iron cores.

In addition, since progressive pressing is adopted as a manufacturing method for a plurality of laminated iron cores, both ends in the hoop width direction may be used for material feeding and positioning during pressing. By improving the mold, a method that does not require the use of both ends in the hoop width direction for material feeding and positioning has been made, but both ends in the hoop width direction have been discarded in order to suppress variations in characteristics. Material loss occurred.

  Moreover, for the same reason resulting from the structure of the iron core, material loss is also a problem in the conventional electric blower. In addition, when the width of the side portion 102 located on both sides of the side portion having the salient pole portion 103 of the iron core and integrally connected between the salient poles is widened, the air passage section 113 in the bracket 106 is provided. However, there was a problem of hindering the blowing efficiency.

  For example, in the case as shown in FIG. 6 of Patent Document 1, the width of a pair of sides formed in the rolling direction of the steel sheet from the difference in magnetic flux transmission between the rolling direction of the non-oriented electrical steel sheet and the direction orthogonal thereto. In some cases, a contrivance is made to make the width narrower than the width of the side portion formed in the direction orthogonal to the steel plate rolling direction. As shown in the above case, the method of regulating the punching direction of the iron core in consideration of the magnetic characteristics and the method of changing the width of the side have no improvement effect in generating material loss at both ends in the hoop width direction. . In addition, when a mold that does not discard both ends in the hoop width direction is used, when the end in the hoop width direction is used, characteristic variation becomes large, and appropriate cost control cannot be performed.

  The rotating electrical machine according to the present invention has a rectangular cylindrical field core formed by stacking a plurality of steel sheets manufactured by punching rolled non-oriented electrical steel sheets into a rectangular frame shape, and faces the cylinder of the field core. In a rotating electrical machine comprising: a field having a field winding wound around a salient pole provided in the manner described above; and an armature having a rotating shaft and disposed between the salient poles of the field, A rectangular frame shape is formed by a pair of sides formed in a pair and a pair of sides formed in a direction orthogonal to the steel plate rolling direction, and the width of the side formed in the steel plate rolling direction is a direction orthogonal to the steel plate rolling direction. The rotating electrical machine includes a salient pole portion that is wider than the side portion to be formed on the side plate and winds the field winding around the side portion in the steel plate rolling direction.

  In addition, an electric blower of the present invention includes the above-described rotating electric machine, has a cylindrical portion, a bracket that incorporates a field magnet by closely contacting each corner of the field core to the inner surface of the cylindrical portion, and an end of the rotating shaft And a fan case that covers the fan and guides the air blown from the fan into the bracket.

  Moreover, the apparatus of this invention comprises the said electric blower.

  According to the rotating electrical machine of the present invention, since the width of the side portion formed in the steel plate rolling method is widened, the use of the end in the hoop width direction does not cause performance deterioration, and the material cost can be reduced. Further, according to the electric blower of the present invention, even if the width of the side portion is widened, the material cost can be reduced without causing an influence on the blowing efficiency due to the reduction of the cross-sectional area of ventilation. Moreover, according to the apparatus of this invention, material cost can be reduced and an inexpensive apparatus can be implement | achieved.

The fragmentary sectional view which shows the structure of the electric blower which concerns on embodiment of this invention The fragmentary sectional view which shows the state which press-fit the field in the bracket of the electric blower which concerns on embodiment of this invention Explanatory drawing which shows the field iron core which the salient pole part was provided in the side part formed in a steel plate rolling direction Explanatory drawing of the process which shows the core punching which concerns on embodiment of this invention Partial sectional view showing the configuration of a conventional electric blower Partial sectional view showing a state in which a field is pressed into a bracket of a conventional electric blower Explanatory drawing showing a conventional field core Process diagram showing conventional core punching

  Hereinafter, an electric blower using a rotating electrical machine according to an embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is a partial cross-sectional view showing the configuration of the electric blower according to the present embodiment, FIG. 2 is a partial cross-sectional view showing a state where a field is pressed into a bracket of the electric blower, and FIG. It is explanatory drawing which shows the field iron core in which the salient pole part was provided in the side part to form. 1 to 3, the electric blower 11 is provided with a rotating electrical machine in a cylindrical bracket 6 that is closed on one side and opened in the opposite direction. The rotating electric machine is generally composed of a field 12 and an armature 10. The field 12 includes a field iron core 4 having a rectangular cylindrical shape and a field winding 14.

  The field iron core 4 is configured by laminating a plurality of non-oriented electrical steel sheets, and a pair of opposed salient pole portions 3 are formed in the cylinder. The field winding 14 is wound around each salient pole portion 3 and increases in thickness toward the outside of the cylinder as the number of turns increases. The armature 10 is rotatably provided in the cylinder so as to be sandwiched between the salient pole portions 3.

  A contact surface 15 is formed at each corner 5 of the field iron core 4 along the direction of the rotation axis 7 of the bracket 6. Each contact surface 15 is pressed against the inner peripheral surface 16 of the bracket 6, and the field 12 is fixed to the bracket 6.

  A fan case 9 is attached so as to cover the opened side of the bracket 6. The rotating shaft 7 of the armature 10 protrudes from the opening and enters the fan case 9. A centrifugal fan 8 is attached to the tip of the rotating shaft 7. An air guide 17 is attached between the centrifugal fan 8 and the opening of the bracket 6. The centrifugal fan 8 and the air guide 17 are disposed in the fan case 9.

  The field iron core 4 is manufactured by punching a rolled non-oriented electrical steel sheet. As shown in FIG. 3, the field iron core 4 includes a pair of side portions 1 formed in the steel plate rolling direction (A direction), and a pair of side portions 2 formed in a direction orthogonal to the steel plate rolling direction (B direction). It has a rectangular frame shape. The side part 1 and the side part 2 have substantially the same length, but the width 18 of the side part 1 is formed to be wider than the width 19 of the side part 2.

  A salient pole portion 3 for winding the field winding 14 is provided inside the side portion 1. The salient pole portions 3 are formed in an arc shape along the outer peripheral shape of the armature 10 and stacked. When a current flows through the field winding 14 wound around the salient pole portion 3, both ends of the circular arc shape become magnetic poles.

  In the electric blower 11 according to the present embodiment, when a current flows through the field winding 14 and a magnetic flux is generated, the magnetic flux passes through the side portions 1 and 2 of the field core 4 as a magnetic path, and the armature 10 Rotate. When the centrifugal fan 8 rotates with the rotation of the armature 10, air is sucked from the air inlet 20 and flows into the centrifugal fan 8, and is discharged out of the motor through the bracket 6.

  FIG. 4 is an explanatory diagram of the process showing the punching of the iron core according to the present embodiment. As shown in FIG. 3 and FIG. 4, since the end in the hoop width direction may be used, the side portion 1 formed in the steel plate rolling direction has a portion where the thickness in the plate thickness direction is thinner than the side portion 2. is there. However, since the width 18 of the side portion 1 is formed wider than the width 19 of the side portion 2, the side portion 1 is made of a material having a normal thickness, and compared with the case where the width is the same as that of the side portion 2. Thus, the amount of magnetic flux transmitted through the field core 4 as a whole does not decrease, and the performance of the motor is ensured.

  On the other hand, widening the width 18 of the side portion 1 effectively uses a portion discarded for material feeding during press working as a product. Even if the end in the hoop width direction is used, the performance is not deteriorated, so that the material cost can be reduced.

  Since the back surface of the salient pole part 3 provided in the side part 1 formed in the steel sheet rolling direction of the field iron core 4 can be formed into a concave shape, the length of the side part 1 is in a direction orthogonal to the steel plate rolling direction. It is shorter than the length of the side part 2 to be formed. The influence of the variation in magnetic properties when using the material at the end in the hoop width direction during press working, that is, the direction orthogonal to the steel plate rolling direction, is smaller when the side portion 1 having the salient pole portion 3 is in the steel plate rolling direction. .

  Further, the field winding 14 wound around the salient pole portion 3 is wound so as to protrude from the back surface of the salient pole portion 3 in order to prevent contact with the armature 10. For this reason, in the electric blower 11, the side portion 1 provided with the salient pole portion 3 for winding the field winding 14 is in contact with the inner peripheral surface 16 of the cylindrical portion of the bracket 6 facing this surface. The ventilation cross-sectional area between is smaller than the ventilation cross-sectional area between the bracket 6 facing the side part 2. Thereby, even if the width 18 of the side part 1 of the iron core is increased, the influence on the blowing efficiency due to the reduction of the cross-sectional area of ventilation is less likely to occur. The width 18 of the side portion 1 may be set as appropriate according to the thickness of the material.

  According to the present invention, the material cost can be reduced, so that the present invention can be applied to rotating electric machines such as generators and electric motors, vacuum cleaners, and the like.

DESCRIPTION OF SYMBOLS 1, 2 Side 3 Salient pole part 4 Field iron core 6 Bracket 7 Rotating shaft 8 Centrifugal fan 9 Fan case 10 Armature 13 Ventilation cross section 14 Field winding 16 Inner peripheral surface 18, 19 Width

Claims (3)

A rectangular cylindrical field core formed by stacking a plurality of steel plates manufactured by punching rolled non-oriented electrical steel sheets into a rectangular frame shape, and salient poles provided so as to face the cylinder of the field core In a rotating electrical machine comprising a field having a field winding wound around and an armature having a rotating shaft and disposed between the salient poles of the field,
The rectangular frame shape is formed by a pair of sides formed in the steel plate rolling direction and a pair of sides formed in a direction orthogonal to the steel plate rolling direction, and the width of the side formed in the steel plate rolling direction is The salient pole part is wider than the side part formed in the direction orthogonal to the steel sheet rolling direction, and has a salient pole part for winding the field winding on the side part in the steel sheet rolling direction . A rotating electrical machine with a concave back surface . A bracket comprising the rotating electrical machine according to claim 1, having a cylindrical portion, and having a corner portion of the field iron core brought into close contact with an inner surface of the cylindrical portion, and an end of the rotating shaft An electric blower comprising: a fan attached to the portion; and a fan case that covers the fan and guides air blown from the fan into the bracket. An apparatus comprising the electric blower according to claim 2.

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